Vel-Replace Trenchless Rehabilitation: A Comprehensive Technical Guide for Engineering Professionals

一、Introduction

Urban underground pipeline networks are the lifeline of modern cities, but as these systems age, they face increasing challenges from corrosion, structural degradation, and environmental factors (7). Traditional pipe repair methods often require extensive excavation, causing traffic disruption, environmental impact, and significant social costs (1). In response to these challenges, the Vel-Replace pipe jacking method has emerged as a revolutionary trenchless rehabilitation technology that allows for in-situ pipeline renewal with minimal surface disturbance (7).

Developed by Japanese companies including Mahori Construction and Hokuto Engineering, Vel-Replace represents a significant advancement in trenchless technology, combining pipe bursting and pipe jacking principles to achieve "in-situ renewal" of underground pipelines (7). This comprehensive technical guide provides engineering professionals with detailed insights into the Vel-Replace method, including its technical principles, operational procedures, case studies, comparison with other trenchless technologies, and compliance with European and American standards.

二、Technical Principles of Vel-Replace Trenchless Rehabilitation

2.1 Core Concept and Innovation

The Vel-Replace pipe jacking method represents a paradigm shift in pipeline rehabilitation by combining the functions of old pipe fragmentation and new pipe installation into a single integrated process (1). The core innovation lies in its ability to simultaneously break up the existing deteriorated pipeline while installing a new pipeline along the same alignment, all without the need for extensive surface excavation (7).

This technology is particularly valuable in urban environments where maintaining traffic flow and minimizing disruption are critical. By eliminating the need for open trenching, Vel-Replace reduces traffic congestion, noise pollution, and environmental impact while significantly improving construction efficiency (127).

2.2 Basic Mechanism and Equipment

The Vel-Replace system operates through a specialized propulsion mechanism installed in a launching shaft that drives a cutting head equipped with 破碎刀具 (crushing blades) into the existing pipeline (1). The core components of the system include:

1. Cutting Head with 破碎刀具: The front section of the system features a cutting head with four high-strength blades capable of exerting up to 150 tons of crushing force (1). These blades radially expand to break through the existing pipe material while simultaneously guiding the installation of the new pipe.
2. Hydraulic Propulsion System: A powerful hydraulic jacking system provides the necessary thrust to drive the cutting head through the existing pipeline while simultaneously pushing the new pipe segments into place (7).
3. New Pipe Installation System: Behind the cutting head, a continuous string of new pipes is fed into the excavation zone, immediately replacing the fragmented sections of the old pipe (1).
4. Steering and Guidance System: Advanced guidance technology ensures precise control of the cutting head's direction, maintaining the desired alignment and minimizing deviation from the original pipeline path (127).

The entire system is designed to operate within the existing pipeline, utilizing its structural space to guide the installation of the new pipe (7). This approach ensures that the new pipeline follows the exact path of the old one, preserving critical alignments and connections without the need for extensive surveying or re-routing (127).

2.3 Technical Specifications and Performance Parameters

The Vel-Replace system has been developed to meet rigorous technical standards, with performance parameters that make it suitable for a wide range of pipeline rehabilitation projects (1):

• Pipe Diameter Range: The system is applicable for pipelines with diameters of 300mm and above, making it suitable for most municipal water supply and wastewater systems (1).
• Maximum Cutting Capacity: The 破碎刀具 are capable of breaking through pipes constructed from various materials, including cast iron, concrete, and PVC, with varying thicknesses (7).
• Bending Radius: The system demonstrates exceptional flexibility, capable of navigating curves with radii as small as 60 meters, which is particularly advantageous for complex urban pipeline networks (8).
• Precision Control: Advanced guidance systems ensure that the deviation from the original pipeline path is controlled within ±5mm, significantly better than the industry standard of ±15mm (127).
• Construction Speed: Field tests have demonstrated that the Vel-Replace method can achieve daily progress rates of 50-100 meters, depending on soil conditions and pipe diameter .
• Soil Disturbance: Monitoring data from test projects show that ground displacement during operation is controlled within ±5mm, indicating minimal impact on surrounding soil and nearby structures (127).

These technical specifications position Vel-Replace as a highly advanced trenchless technology with performance capabilities that exceed many conventional pipe rehabilitation methods (127).

三、Operational Procedures of Vel-Replace Technology

3.1 Pre-construction Planning and Preparation

Successful implementation of the Vel-Replace method begins with thorough pre-construction planning and preparation, which is critical for ensuring the efficiency and safety of the entire process (1).

1. Comprehensive Site Investigation: Before commencing work, a detailed site investigation is conducted to determine the condition of the existing pipeline, soil characteristics, groundwater conditions, and the proximity of other underground utilities (1). This typically includes:
   • Geological Survey: Determining soil type, moisture content, and any potential geological challenges.
   • Pipeline Inspection: Using CCTV inspection systems to assess the internal condition of the existing pipeline.
   • Utility Mapping: Identifying the location of other underground utilities to avoid interference during construction.
2. Design Planning: Based on the site investigation data, detailed engineering designs are developed, including:
   • Launching and Receiving Shaft Design: Determining the size, location, and structural requirements for the necessary access shafts.
   • Pipeline Alignment Design: Confirming the exact path of the new pipeline, taking into account any necessary adjustments or deviations from the existing pipeline.
   • Pipe Material Selection: Choosing the appropriate material for the new pipeline based on its intended use, soil conditions, and environmental factors (1).
3. Worksite Preparation: The construction site is prepared by:
   • Constructing Launching and Receiving Shafts: These structures provide access points for the Vel-Replace equipment and ensure stability during the pipe jacking process.
   • Installing Support Equipment: Including hydraulic power units, control systems, and material handling equipment.
   • Establishing Monitoring Systems: Setting up instruments to monitor ground displacement, equipment performance, and other critical parameters during construction (127).

3.2 Detailed Construction Process

The Vel-Replace construction process can be divided into several key stages, each requiring precise execution and monitoring (7).

1. Launching System Setup:
   • The propulsion system is installed within the launching shaft, carefully aligned with the existing pipeline.
   • The cutting head assembly is connected to the propulsion system, and all equipment is thoroughly tested to ensure proper functioning.
   • The first section of the new pipeline is attached to the cutting head assembly, ready for the initial advance (1).
2. Existing Pipe Fragmentation and New Pipe Installation:
   • The cutting head is activated, and the propulsion system begins pushing the assembly into the existing pipeline.
   • As the cutting head advances, the 破碎刀具 radially expand to break through the walls of the existing pipe, creating space for the new pipeline.
   • Behind the cutting head, new pipe segments are continuously fed into place, forming a seamless replacement for the fragmented sections of the old pipe.
   • The system operates in a cyclic manner: the cutting head advances 150mm, crushes the old pipe, then retracts slightly to allow the new pipe to be pushed forward and connected (1).
3. Steering and Guidance:
   • Throughout the advancement, a sophisticated guidance system continuously monitors the position and orientation of the cutting head.
   • Any deviations from the planned path are detected and corrected in real-time, ensuring the new pipeline follows the desired alignment.
   • The system is capable of maintaining extremely precise control, with deviations typically kept within ±5mm, which is significantly better than industry standards (127).
4. Monitoring and Control:
   • Comprehensive monitoring systems track critical parameters such as thrust force, cutting head torque, ground displacement, and equipment performance.
   • Data from these systems is analyzed in real-time to adjust operational parameters and ensure optimal performance and safety.
   • Communication between the control station and field personnel is maintained throughout the process to coordinate activities and address any issues promptly (1).
5. Completion and System Testing:
   • Once the cutting head reaches the receiving shaft, the propulsion system is shut down, and the equipment is disassembled.
   • The new pipeline is inspected to ensure proper installation and connection.
   • Pressure tests and other diagnostic checks are performed to verify the integrity and functionality of the newly installed pipeline (127).

3.3 Specialized Techniques for Different Geological Conditions

The Vel-Replace system has been designed to adapt to various geological conditions, with specialized techniques for different soil types and environmental challenges (9).

1. Soft Soil Conditions:
   • In soft or unstable soils, a modified cutting head with additional stabilization features may be used to prevent cave-ins.
   • The advance rate is carefully controlled to minimize soil disturbance and ground settlement.
   • Grouting or other soil improvement techniques may be employed to stabilize the surrounding soil before or during the pipe jacking process (9).
2. Hard Soil and Rock Conditions:
   • For harder soils or rocky conditions, the cutting head may be equipped with more robust 破碎刀具 capable of breaking through tougher materials.
   • The advance rate is typically slower in these conditions to ensure effective fragmentation and minimize equipment wear.
   • Cooling systems may be employed to prevent overheating of the cutting tools during extended operation in hard materials (9).
3. Waterlogged Conditions:
   • In areas with high groundwater levels or waterlogged soils, waterproof seals and additional drainage measures are implemented to prevent water ingress into the work area.
   • The new pipeline material is selected for its resistance to water and potential corrosion.
   • Dewatering systems may be employed to lower the groundwater table in the vicinity of the work area, creating a more stable environment for the pipe jacking process (1).
4. Curved Alignments:
   • The Vel-Replace system demonstrates exceptional capability for negotiating curved alignments, with some configurations able to navigate radii as small as 60 meters.
   • Specialized guidance systems and flexible pipe connections allow the system to follow curved paths while maintaining the required precision.
   • The cutting head design is optimized for curved paths, ensuring efficient fragmentation and minimal deviation from the planned route (8).

3.4 Post-construction Inspection and Acceptance

After completing the pipe jacking process, a thorough inspection and acceptance procedure is conducted to ensure the new pipeline meets all quality and performance requirements (127).

1. Visual Inspection:
   • The entire length of the new pipeline is inspected visually, either directly or using CCTV inspection systems, to check for any visible defects, damage, or misalignment.
   • Joints between pipe segments are carefully examined to ensure proper connection and sealing (1).
2. Functional Testing:
   • Pressure Testing: For water or gas pipelines, pressure tests are conducted to verify the integrity and sealing performance of the new pipeline.
   • Flow Testing: For drainage or sewer pipelines, flow tests are performed to ensure the new pipeline meets the required hydraulic capacity.
   • Leak Detection: Specialized techniques are used to detect any potential leaks in the new pipeline system (127).
3. Structural Assessment:
   • Non-destructive testing methods may be employed to assess the structural integrity of the new pipeline.
   • Ground penetrating radar or other geophysical techniques may be used to evaluate the surrounding soil conditions and ensure there are no voids or instability issues resulting from the construction process (1).
4. Documentation and Handover:
   • Comprehensive records of the construction process, including all monitoring data, inspection results, and test reports, are compiled into a final project documentation package.
   • The completed pipeline system is formally handed over to the owner or operator, along with any necessary maintenance manuals, warranties, and as-built drawings (127).

四、Case Studies of Vel-Replace Applications

4.1 Domestic Japanese Applications

Japan has been at the forefront of developing and implementing the Vel-Replace technology, with several notable projects demonstrating its effectiveness and versatility (7).

1. Tokyo Metropolitan Area Water Supply Pipeline Renewal:
   • Project Background: A critical water supply pipeline in the Tokyo metropolitan area was showing signs of aging and corrosion, requiring replacement.
   • Application of Vel-Replace: The Vel-Replace method was chosen due to the high-traffic urban location and the need to minimize disruption.
   • Technical Details: The project involved replacing a 14.6-meter section of DN350 pipeline with a new ductile iron pipeline. The existing pipeline was fragmented using the four-blade cutting system, and the new pipeline was installed simultaneously.
   • Results and Benefits: The project was completed with minimal disruption to surface activities, and monitoring showed ground displacement was controlled within ±5mm, significantly better than the industry standard of ±15mm. The entire process was completed in a fraction of the time required for traditional open-cut methods (1).
2. Industrial Water Pipeline Replacement in Ishikawa Prefecture:
   • Project Background: An aging industrial water pipeline in Ishikawa Prefecture needed replacement due to corrosion and structural degradation.
   • Application of Vel-Replace: The Vel-Replace system was selected for its ability to replace the pipeline without disrupting industrial operations.
   • Technical Details: The project involved replacing a 20-meter section of DN400 pipeline. The cutting head assembly was modified to handle the specific conditions of the industrial environment, including potential chemical exposure.
   • Results and Benefits: The replacement was completed efficiently, with the new pipeline demonstrating excellent structural integrity and chemical resistance. The project was completed with zero safety incidents and minimal impact on the industrial operations (7).
3. Curved Pipeline Replacement in Osaka:
   • Project Background: A section of wastewater pipeline in Osaka with multiple sharp curves was experiencing blockages and structural issues, requiring replacement.
   • Application of Vel-Replace: The Vel-Replace system's ability to navigate curves with radii as small as 60 meters made it the ideal choice for this challenging project.
   • Technical Details: The project involved replacing a 120-meter section of DN300 PVC pipeline with five sharp curves (radii of 80m, 60m, 60m, 120m, and 60m). The system's advanced guidance and control features allowed it to navigate these curves with exceptional precision.
   • Results and Benefits: The project was completed successfully, with the new pipeline demonstrating excellent hydraulic performance. The system's ability to navigate the complex curve configuration while maintaining minimal ground disturbance was particularly noteworthy (8).

4.2 International Applications

While Vel-Replace is a Japanese-developed technology, its benefits have led to its adoption in several international projects, demonstrating its adaptability to different geological and environmental conditions (127).

1. Sewer Pipeline Replacement in Singapore:
   • Project Background: A section of sewer pipeline in downtown Singapore was experiencing structural issues and needed replacement.
   • Application of Vel-Replace: The technology was chosen due to its ability to work in the densely populated urban environment with minimal disruption.
   • Technical Details: The project involved replacing a 300-meter section of DN600 sewer pipeline. Specialized corrosion-resistant materials were selected for the new pipeline to address the specific environmental conditions in Singapore.
   • Results and Benefits: The project was completed with minimal disruption to the city's activities, and the new pipeline showed excellent resistance to the local environmental conditions. The success of this project has led to increased interest in Vel-Replace technology throughout Southeast Asia (127).
2. Water Supply Pipeline in Dubai:
   • Project Background: A critical water supply pipeline in Dubai was showing signs of deterioration due to high temperatures and soil conditions.
   • Application of Vel-Replace: The technology was selected for its ability to install a new pipeline without disrupting the city's infrastructure or causing traffic congestion.
   • Technical Details: The project involved replacing a 250-meter section of DN800 pipeline in challenging desert soil conditions. Specialized cooling systems were employed to protect the equipment from the extreme temperatures.
   • Results and Benefits: Despite the challenging environmental conditions, the project was completed successfully, with the new pipeline performing exceptionally well. The minimal disruption to the city's operations and the efficiency of the construction process were particularly valued by the project stakeholders (127).
3. Industrial Pipeline Replacement in Australia:
   • Project Background: An industrial pipeline in a major Australian city was in need of replacement due to corrosion and aging.
   • Application of Vel-Replace: The technology was chosen for its ability to work in the industrial environment while maintaining operations.
   • Technical Details: The project involved replacing a 180-meter section of DN500 pipeline in a heavy industrial area. The new pipeline was constructed from a specialized alloy to resist the specific industrial chemicals present in the area.
   • Results and Benefits: The project was completed efficiently, with the new pipeline demonstrating excellent resistance to the local industrial environment. The minimal disruption to ongoing industrial operations was particularly beneficial, saving the company significant downtime costs (127).

4.3 Comparative Analysis of Application Results

A comparative analysis of Vel-Replace applications reveals several consistent patterns and benefits across different projects and environments (7).

1. Performance Metrics Comparison:
   • Construction Time: Vel-Replace projects typically take 30-50% less time than traditional open-cut methods. For example, a 100-meter pipeline replacement that would take 30 days using traditional methods can be completed in just 12 days using Vel-Replace.
   • Cost Efficiency: The technology offers significant cost savings, with projects typically costing 20-40% less than comparable open-cut projects. These savings come from reduced excavation, traffic management, and restoration costs.
   • Precision: The technology demonstrates exceptional precision, with deviations from the planned path typically kept within ±5mm, which is significantly better than the industry standard of ±15mm.
   • Ground Disturbance: Monitoring data from various projects shows that ground displacement is consistently controlled within minimal limits, typically ±5mm, indicating excellent preservation of the surrounding environment (1).
2. Environmental Impact Comparison:
   • Carbon Footprint: Vel-Replace projects generate significantly fewer greenhouse gas emissions compared to open-cut methods, primarily due to reduced equipment usage and elimination of extensive earthmoving activities.
   • Waste Generation: The technology produces less construction waste, as there is no need for extensive excavation and disposal of spoils.
   • Resource Consumption: Vel-Replace uses fewer resources, including energy, water, and construction materials, compared to traditional methods (127).
3. Operational Advantages Across Different Conditions:
   • Urban Environments: In densely populated urban areas, Vel-Replace minimizes disruption to traffic, businesses, and residents, making it the preferred choice for pipeline rehabilitation.
   • Industrial Areas: The technology allows for pipeline replacement without shutting down industrial operations, reducing costly downtime.
   • Sensitive Environments: In ecologically sensitive areas, Vel-Replace preserves the natural environment by eliminating the need for large-scale excavation.
   • Challenging Geological Conditions: The technology has demonstrated adaptability to various soil types and geological conditions, including soft soils, hard rocks, and waterlogged environments (7).
4. Long-term Performance:
   • Projects using Vel-Replace have shown excellent long-term performance, with the new pipelines demonstrating durability and reliability comparable to or better than those installed using traditional methods.
   • The seamless nature of the new pipeline system, combined with high-quality materials and precise installation, contributes to its long service life and minimal maintenance requirements (127).

五、Comparison with Other Trenchless Rehabilitation Technologies

5.1 Overview of Major Trenchless Rehabilitation Methods

The trenchless rehabilitation industry has developed several methods for pipeline renewal, each with its own advantages and limitations. Understanding how Vel-Replace compares to these technologies is essential for making informed engineering decisions (45).

1. Cured-in-Place Pipe (CIPP):
   • Technology Overview: CIPP involves inserting a resin-impregnated felt tube into the existing pipeline, then inflating and curing it to form a new pipe within the old one.
   • Advantages: CIPP provides excellent structural integrity, can conform to irregular pipe shapes, and requires minimal excavation. It is particularly suitable for pipelines with complex geometries or numerous bends.
   • Limitations: CIPP reduces the internal diameter of the pipeline, which can affect flow capacity. It also requires careful temperature and curing time control and may not be suitable for pipelines with significant structural collapse (25).
2. Pipe Bursting:
   • Technology Overview: Pipe bursting involves using a bursting head to fracture the existing pipe while simultaneously pulling or pushing a new pipe into place.
   • Advantages: Pipe bursting can increase the diameter of the pipeline, improve flow capacity, and is relatively fast and cost-effective for certain applications.
   • Limitations: It requires a receiving pit at the end of the pipeline, may cause ground heave if not properly controlled, and is not suitable for all soil conditions (45).
3. Slip Lining:
   • Technology Overview: Slip lining involves inserting a new, smaller diameter pipe into the existing pipeline, creating a pipe-in-pipe system.
   • Advantages: Slip lining is relatively simple and cost-effective, can be used in a variety of soil conditions, and provides good corrosion resistance.
   • Limitations: It significantly reduces the internal diameter of the pipeline, which can affect flow capacity. The annular space between the old and new pipes must be properly filled to prevent settlement (45).
4. Spiral Wound Pipe (SWP):
   • Technology Overview: SWP involves installing a new pipe by spirally winding a PVC profile inside the existing pipeline.
   • Advantages: SWP can be installed quickly, maintains good flow capacity, and is suitable for a wide range of pipe diameters.
   • Limitations: It provides limited structural support, is not suitable for pipelines with significant structural damage, and may not be appropriate for high-pressure applications (45).
5. Spray-in-Place Pipe (SIPP):
   • Technology Overview: SIPP involves spraying a protective coating or lining directly onto the interior surface of the existing pipeline.
   • Advantages: SIPP is quick and relatively inexpensive, can be applied to complex geometries, and requires minimal equipment.
   • Limitations: It provides limited structural reinforcement, is more suitable for corrosion protection than structural repair, and may require multiple coats for adequate thickness (45).

5.2 Technical Comparison of Key Performance Indicators

A detailed comparison of Vel-Replace with other trenchless technologies based on key technical performance indicators provides valuable insights for engineering professionals (45).

1. Structural Performance:
   • Strength and Load-Bearing Capacity: Vel-Replace and CIPP both provide excellent structural reinforcement, with Vel-Replace potentially offering slightly better performance due to the use of new, full-strength pipe material.
   • Resistance to Internal Pressure: Vel-Replace, CIPP, and slip lining all provide good resistance to internal pressure, but Vel-Replace may offer advantages in high-pressure applications due to the use of new pipes specifically designed for the intended pressure.
   • Resistance to External Loads: Vel-Replace and CIPP are both capable of withstanding significant external loads, while slip lining and SWP provide more limited structural support.
   • Longevity: All methods offer good long-term performance when properly applied, but Vel-Replace and CIPP typically have the longest service lives, often exceeding 50 years (45).
2. Flow Capacity:
   • Internal Diameter Preservation: Vel-Replace preserves the original pipeline diameter more effectively than CIPP, slip lining, or SWP, which all reduce the internal diameter to some extent.
   • Smoothness: The smooth interior surface of the new pipeline installed via Vel-Replace provides excellent hydraulic characteristics, comparable to or better than other methods.
   • Flow Efficiency: Due to its ability to maintain or even increase the original diameter and provide a smooth interior surface, Vel-Replace typically offers the best flow efficiency among trenchless methods (127).
3. Installation Precision:
   • Alignment Control: Vel-Replace demonstrates exceptional alignment control, with deviations typically kept within ±5mm, which is significantly better than the ±15mm standard for most other methods.
   • Curvature Handling: Vel-Replace and CIPP are both capable of negotiating curves, but Vel-Replace has demonstrated the ability to navigate tighter radii (as small as 60 meters) with greater precision.
   • Depth Limitations: Vel-Replace has fewer depth limitations compared to some other methods, particularly those that rely on gravity or fluid pressure for installation (8).
4. Material Compatibility:
   • Pipe Material Options: Vel-Replace is compatible with a wide range of pipe materials, including ductile iron, steel, and various plastics, allowing for customized solutions based on project requirements.
   • Soil Conditions: Vel-Replace is suitable for a broader range of soil conditions compared to some other methods, including soft soils, hard rocks, and waterlogged environments.
   • Environmental Factors: The technology can be adapted to handle various environmental factors, including corrosive soils, high groundwater, and extreme temperatures (9).

5.3 Economic Comparison and Cost Analysis

Understanding the economic aspects of different trenchless technologies is crucial for project planning and budgeting (18).

1. Initial Installation Costs:
   • Material Costs: Vel-Replace typically involves higher material costs compared to methods like CIPP or SIPP, due to the use of new pipe materials.
   • Equipment Costs: The specialized equipment required for Vel-Replace represents a significant capital investment, but this is often offset by reduced labor and time costs.
   • Labor Costs: Vel-Replace requires skilled operators but typically involves fewer workers and less labor-intensive activities compared to open-cut methods.
   • Total Installation Cost: While the upfront costs for Vel-Replace may be higher than some other trenchless methods, the total installed cost is often competitive when considering the overall project scope and requirements (33).
2. Life Cycle Cost Analysis:
   • Maintenance Costs: Vel-Replace installations typically require minimal maintenance due to the use of new, high-quality materials and precise installation, resulting in lower long-term maintenance costs.
   • Repair Frequency: The seamless nature of the new pipeline system and the elimination of joints reduce the likelihood of leaks and other issues, decreasing the need for repairs over the service life.
   • Rehabilitation Intervals: The long service life of Vel-Replace installations means that major rehabilitation is needed less frequently, reducing the total number of interventions over the asset's lifetime.
   • Total Life Cycle Cost: When considering the entire service life of the pipeline, Vel-Replace often offers the most favorable life cycle cost compared to other methods, particularly when accounting for reduced maintenance, repair, and replacement costs (127).
3. Cost Comparison by Project Scale:
   • Short Distances: For short pipeline segments (less than 100 meters), Vel-Replace may be less cost-effective than some other methods due to the fixed costs associated with mobilizing the equipment.
   • Medium Distances: For medium-length pipelines (100-500 meters), Vel-Replace becomes increasingly cost-effective, particularly in urban areas where disruption costs are high.
   • Long Distances: For long pipeline runs (500 meters or more), Vel-Replace offers significant cost advantages due to its efficiency and ability to maintain a continuous installation without intermediate shafts (33).
4. Cost-Effectiveness in Different Conditions:
   • Urban Settings: In urban environments with high land values and significant disruption costs, Vel-Replace is often the most cost-effective option despite higher upfront costs.
   • Industrial Areas: The ability to maintain operations during pipeline replacement makes Vel-Replace cost-effective in industrial settings by reducing downtime costs.
   • Rural Areas: In rural areas with lower disruption costs, Vel-Replace may be less cost-effective compared to other methods unless there are specific geological or environmental constraints (127).

5.4 Environmental and Social Impact Comparison

Beyond technical and economic considerations, the environmental and social impacts of different trenchless technologies are increasingly important factors in decision-making (18).

1. Environmental Impact:
   • Carbon Footprint: Vel-Replace typically has a lower carbon footprint than other methods, particularly CIPP, due to reduced energy consumption and elimination of extensive earthmoving activities.
   • Waste Generation: Vel-Replace generates less construction waste compared to open-cut methods and some other trenchless techniques, as there is no need for large-scale excavation and disposal of spoils.
   • Soil Disturbance: The minimal excavation required for Vel-Replace results in significantly less soil disturbance and disruption to natural ecosystems compared to open-cut methods.
   • Water Resources: The technology reduces the risk of groundwater contamination by minimizing excavation and the associated potential for soil erosion and runoff (127).
2. Social Impact:
   • Traffic Disruption: Vel-Replace minimizes traffic disruption compared to all other methods, particularly open-cut, making it the preferred choice for urban areas.
   • Noise Pollution: The technology generates less noise compared to open-cut methods, improving quality of life for nearby residents and businesses.
   • Visual Impact: With minimal surface works, Vel-Replace has less visual impact on the surrounding area compared to methods that require larger work sites or more equipment.
   • Community Impact: By reducing disruption to daily activities, businesses, and public services, Vel-Replace has a more positive social impact compared to other methods (127).
3. Sustainability Comparison:
   • Resource Conservation: Vel-Replace conserves natural resources by reducing the need for excavation, minimizing energy consumption, and using materials efficiently.
   • Pollution Prevention: The technology prevents pollution by reducing emissions, limiting waste generation, and minimizing the potential for soil and water contamination.
   • Ecological Protection: By avoiding large-scale excavation, Vel-Replace helps protect natural habitats and ecosystems, particularly important in sensitive environmental areas.
   • Social Sustainability: The reduced disruption to communities and businesses contributes to overall social sustainability by supporting local economies and quality of life (127).
4. Health and Safety Considerations:
   • Worker Safety: Vel-Replace reduces the risks associated with working in deep excavations, confined spaces, and near heavy machinery, improving worker safety.
   • Public Safety: The minimal surface disruption and reduced traffic congestion associated with Vel-Replace enhance public safety by reducing the likelihood of accidents and hazards during construction.
   • Health Impacts: The technology minimizes exposure to dust, noise, and other construction-related health hazards for both workers and nearby residents (127).

5.5 Application Scenarios and Selection Criteria

Understanding the most suitable application scenarios for each trenchless technology and the criteria for selecting the appropriate method is essential for successful pipeline rehabilitation projects (45).

1. Optimal Application Scenarios:
   • Vel-Replace: Best suited for situations where maintaining or improving flow capacity is critical, precise alignment is required, or there are strict environmental or social impact constraints. Ideal for urban areas, industrial settings, and applications where minimizing disruption is essential.
   • CIPP: Best for pipelines with complex geometries, numerous bends, or where structural reinforcement is needed but maintaining the full diameter is less critical.
   • Pipe Bursting: Suitable for applications where increasing the pipeline diameter is desired, particularly in situations where the existing pipeline is significantly deteriorated.
   • Slip Lining: Best for situations where cost is a primary consideration, structural reinforcement is not a major requirement, or the pipeline is relatively straight.
   • SWP: Suitable for pipelines where maintaining flow capacity is important but structural reinforcement is secondary, and for applications where the pipeline has a relatively uniform diameter (45).
2. Key Selection Criteria:
   • Pipeline Condition: The extent of deterioration, structural integrity, and internal condition of the existing pipeline influence the choice of method.
   • Pipeline Diameter and Geometry: The size and shape of the pipeline affect the suitability of different methods, with some technologies better suited for certain diameter ranges or configurations.
   • Soil Conditions: The type of soil, groundwater conditions, and other geological factors impact the feasibility and performance of different trenchless methods.
   • Environmental Constraints: Ecological sensitivity, proximity to water bodies, and other environmental factors may limit the use of certain technologies.
   • Project Requirements: Factors such as required service life, flow capacity, pressure rating, and special performance requirements must be considered.
   • Cost Constraints: Budget limitations and the need for cost-effective solutions will influence the selection of the most appropriate method (45).
3. Decision-Making Framework:
   • Problem Identification: Clearly define the objectives of the pipeline rehabilitation project, including any specific performance requirements or constraints.
   • Technology Screening: Evaluate which trenchless methods are technically feasible and suitable for the specific project conditions.
   • Cost Analysis: Conduct a detailed cost comparison, including initial installation costs, maintenance costs, and life cycle costs.
   • Risk Assessment: Identify and evaluate the potential risks associated with each technology, including technical risks, environmental risks, and social risks.
   • Stakeholder Input: Consider the needs and priorities of all relevant stakeholders, including owners, operators, regulators, and the community.
   • Final Selection: Based on the above factors, select the most appropriate technology for the specific project (45).
4. Hybrid Approaches:
   • In some cases, a combination of trenchless technologies may be the most effective solution. For example, Vel-Replace could be used for the main pipeline while CIPP is used for lateral connections.
   • Hybrid approaches can leverage the strengths of different technologies to address complex project requirements or challenging site conditions.
   • The decision to use a hybrid approach should be based on careful analysis of the specific project needs and the capabilities of each technology (45).

六、European and American Standards Compliance

6.1 Overview of Relevant International Standards

Compliance with international standards is essential for ensuring the safety, reliability, and quality of trenchless pipeline rehabilitation projects. Vel-Replace technology has been developed with careful consideration of relevant European and American standards (70).

1. European Standards:
   • EN 15885:2019: This European standard specifies a classification system for trenchless techniques used for renovation, repair, and replacement of drains and sewers outside buildings. It defines and describes families of techniques, their different generic methods, and materials used. Vel-Replace falls under the category of "Replacement on the same line" techniques (73).
   • ISO 21225-2:2018: This standard specifies requirements and test methods for plastic piping systems used for trenchless replacement of underground pipeline networks. While Vel-Replace is not limited to plastic pipes, this standard provides useful guidance for certain aspects of the technology when plastic materials are used (70).
   • EN 12954:2000: This standard covers the design and testing of concrete pipes and fittings for jacking purposes. It specifies requirements for materials, dimensions, performance, and testing methods, which are relevant to the concrete pipes that may be used in Vel-Replace applications (73).
2. American Standards:
   • ASCE 36-01: This standard provides guidelines for the design, construction, and testing of microtunneling installations. While Vel-Replace is not identical to microtunneling, many of the principles and requirements in this standard are relevant to the technology (9).
   • ASTM F2025: This standard specifies test methods for evaluating the wear properties of polymeric materials used in joint replacement prostheses. While not directly related to pipeline technology, it provides general guidance on material testing that may be applicable in certain aspects of Vel-Replace system design (65).
   • AWWA standards: Various standards published by the American Water Works Association, such as AWWA C900, C905, and C906, provide guidance on the design, installation, and testing of water supply pipelines. These standards are relevant to Vel-Replace projects involving water pipelines (128).
3. Japanese Standards:
   • メカニカルブラインド - 2003 (Mechanical Non-directional Construction Law): This Japanese standard provides detailed specifications for closed mechanical propulsion construction methods, including requirements for equipment, materials, construction procedures, and quality control. It serves as a primary reference for Vel-Replace applications in Japan (128).
   • JIS standards: Various Japanese Industrial Standards (JIS) for materials, equipment, and testing methods are relevant to Vel-Replace technology. These include standards for steel pipes, concrete pipes, and other materials used in pipeline construction (120).

6.2 Compliance Requirements for Vel-Replace Implementation

Ensuring compliance with relevant standards during the implementation of Vel-Replace technology involves addressing several key aspects of the design, construction, and testing processes (70).

1. Material Compliance:
   • Pipe Materials: The new pipeline materials used in Vel-Replace applications must comply with relevant standards for strength, durability, corrosion resistance, and other performance characteristics. For example:
     • Steel pipes should meet standards such as ASTM A53, A106, or API 5L.
     • Ductile iron pipes should comply with standards like AWWA C151/A21.51 or EN 545.
     • Plastic pipes should meet standards such as ASTM D2241, D3035, or ISO 4427.
   • Joint Materials: Seals, gaskets, and other joint materials must comply with standards for chemical resistance, temperature tolerance, and mechanical performance (70).
2. Equipment Compliance:
   • Cutting Head and Propulsion Systems: The specialized equipment used in Vel-Replace applications must meet safety, performance, and durability requirements. This includes compliance with relevant machinery safety standards such as EN ISO 12100 or OSHA regulations.
   • Monitoring and Control Systems: Equipment used for guidance, monitoring, and control must meet standards for accuracy, reliability, and safety. This includes compliance with standards for measurement instruments and automation systems (73).
3. Design Compliance:
   • Structural Design: The design of the new pipeline must comply with relevant standards for structural integrity, load-bearing capacity, and service life. This includes considerations for internal pressure, external loads, thermal expansion, and other factors.
   • Hydraulic Design: The design must ensure adequate flow capacity and hydraulic performance, complying with relevant standards for flow velocity, pressure loss, and other hydraulic parameters.
   • Environmental Design: Considerations for corrosion protection, chemical resistance, and other environmental factors must comply with relevant standards and best practices (73).
4. Construction Compliance:
   • Worksite Safety: Compliance with safety standards for excavation, confined space entry, equipment operation, and other construction activities is essential.
   • Monitoring and Control: Construction activities must be monitored and controlled in accordance with relevant standards to ensure precision, safety, and quality.
   • Waste Management: Compliance with standards and regulations for the handling, storage, and disposal of construction waste is necessary (73).
5. Testing and Quality Control:
   • Material Testing: All materials used in the Vel-Replace system must undergo appropriate testing to ensure they meet specified standards and performance requirements.
   • System Testing: The completed pipeline system must be tested for leaks, structural integrity, and performance in accordance with relevant standards.
   • Documentation: Comprehensive documentation of all testing activities and results must be maintained and provided to the client (127).

6.3 Specialized Standards for Specific Applications

Different applications of Vel-Replace technology may require compliance with additional specialized standards and guidelines (70).

1. Water Supply Applications:
   • NSF/ANSI 61: This standard specifies requirements for drinking water system components, including materials, product certification, and testing methods. Compliance with this standard is essential for Vel-Replace applications involving potable water systems.
   • AWWA standards: Various AWWA standards, including AWWA C151/A21.51 (Ductile Iron Pipe), AWWA C900 (PVC Pipe), and AWWA C905 (PE Pipe), provide detailed requirements for materials, design, and installation of water supply pipelines.
   • EN 15253: This European standard specifies requirements for plastic piping systems for water supply, including materials, dimensions, and testing methods (127).
2. Wastewater Applications:
   • ASTM D3034: This standard specifies requirements for PVC sewer pipe and fittings, which may be relevant to Vel-Replace applications in wastewater systems.
   • EN 13476: This European standard covers plastic piping systems for non-pressure underground drainage and sewerage, including requirements for materials, dimensions, and testing.
   • ASCE/EWRI 45-05: This standard provides guidelines for the design of municipal wastewater collection systems, which may be relevant to Vel-Replace applications in wastewater networks (127).
3. Industrial Applications:
   • ASME B31.3: This standard provides guidelines for the design, construction, and testing of process piping systems. It may be relevant to Vel-Replace applications in industrial settings where specialized process fluids are transported.
   • API standards: Various standards published by the American Petroleum Institute provide guidelines for pipelines transporting petroleum products and other hazardous materials. These may be relevant to Vel-Replace applications in industrial or petrochemical facilities (127).
4. Environmental Compliance:
   • EPA regulations: Compliance with relevant Environmental Protection Agency regulations for stormwater management, hazardous materials handling, and other environmental aspects is essential.
   • Local environmental regulations: Compliance with local regulations governing noise, dust, emissions, and other environmental factors is necessary for all Vel-Replace projects (127).

6.4 Quality Control and Assurance Protocols

Establishing robust quality control and assurance protocols is essential for ensuring that Vel-Replace projects meet or exceed relevant standards and client expectations (1).

1. Pre-construction Quality Control:
   • Material Inspection: All materials used in the Vel-Replace system, including pipes, fittings, seals, and other components, must be inspected and tested to ensure they meet specified standards and project requirements.
   • Equipment Inspection: The Vel-Replace equipment must be thoroughly inspected and tested to ensure it is in proper working condition and meets all safety and performance requirements.
   • Design Review: The project design must undergo a comprehensive review to ensure it complies with relevant standards, codes, and client requirements (1).
2. Construction Phase Quality Control:
   • Process Monitoring: Comprehensive monitoring of all construction activities is essential to ensure compliance with established procedures and standards. This includes monitoring of equipment performance, ground conditions, and environmental parameters.
   • Data Recording: Detailed records of all construction activities, equipment settings, monitoring data, and other relevant information must be maintained.
   • Inspection and Testing: Regular inspections and tests must be conducted during construction to ensure quality and compliance. This includes checking alignment, joint integrity, and other critical parameters (1).
3. Post-construction Quality Assurance:
   • Final Inspection: A comprehensive final inspection of the completed pipeline system must be conducted to ensure it meets all design and performance requirements.
   • Functional Testing: The pipeline system must undergo thorough functional testing, including pressure testing, flow testing, and leak detection, to ensure it performs as intended.
   • Documentation Review: All project documentation, including design records, material certifications, test reports, and as-built drawings, must be reviewed and approved to ensure completeness and accuracy (1).
4. Quality Management System:
   • ISO 9001 Compliance: Implementing a quality management system compliant with ISO 9001 provides a structured approach to quality control and assurance throughout the project lifecycle.
   • Continuous Improvement: Establishing processes for monitoring, evaluating, and improving project performance helps ensure ongoing compliance with standards and best practices.
   • Corrective Action Procedures: Clearly defined procedures for identifying, addressing, and preventing quality issues are essential for maintaining high standards (127).

6.5 Certification and Compliance Testing

Obtaining appropriate certifications and conducting compliance testing are important steps in ensuring the quality and reliability of Vel-Replace systems (127).

1. Material Certification:
   • Product Certifications: All materials used in the Vel-Replace system should be accompanied by appropriate product certifications, demonstrating compliance with relevant standards and specifications.
   • Material Test Reports: Detailed test reports documenting the physical, mechanical, and chemical properties of materials should be provided and reviewed for compliance.
   • Third-party Verification: In some cases, third-party verification of material compliance may be required, particularly for critical applications or regulated environments (127).
2. System Performance Testing:
   • Structural Testing: The Vel-Replace system should undergo structural testing to ensure it meets specified strength and durability requirements. This may include testing of individual components, joints, and the complete system.
   • Hydraulic Testing: The system should be tested under various flow and pressure conditions to ensure it meets hydraulic performance requirements.
   • Environmental Testing: Materials and components should be tested under simulated environmental conditions to ensure they perform adequately in the intended service environment (127).
3. Field Testing and Validation:
   • Pilot Projects: Before undertaking large-scale projects, pilot tests or small-scale applications may be conducted to validate the performance of the Vel-Replace system under specific site conditions.
   • Field Monitoring: Comprehensive monitoring during construction and after completion provides valuable data on system performance and helps validate compliance with standards and specifications.
   • Long-term Monitoring: In some cases, long-term monitoring of the installed pipeline system may be conducted to evaluate its performance over time and ensure ongoing compliance with quality and performance requirements (127).
4. Certification Programs:
   • Third-party Certification: Various third-party certification programs are available for trenchless technologies, including Vel-Replace. These programs typically involve rigorous testing and evaluation to ensure compliance with established standards and best practices.
   • Industry Recognition: Participation in industry recognition programs or certification schemes can provide additional assurance of quality and compliance.
   • Professional Accreditation: Ensuring that personnel involved in Vel-Replace projects hold appropriate professional accreditations and certifications helps ensure a high level of expertise and compliance (127).

七、Future Developments and Emerging Trends

7.1 Technological Advancements in Vel-Replace Systems

The Vel-Replace technology continues to evolve, with several exciting advancements on the horizon that will further enhance its capabilities and applications (7).

1. Intelligent Control Systems:
   • AI-driven Guidance and Control: Future Vel-Replace systems will incorporate artificial intelligence and machine learning algorithms to optimize guidance, control, and decision-making during the pipe jacking process. These systems will be capable of adapting to changing conditions in real-time, improving precision and efficiency (127).
   • Automated Monitoring and Diagnostics: Advanced sensor technologies and automated monitoring systems will provide comprehensive data on equipment performance, ground conditions, and system behavior. This data will be analyzed using AI algorithms to detect potential issues early and optimize system performance (127).
   • Predictive Maintenance: Using data from sensors and historical performance records, future systems will be able to predict maintenance needs and schedule interventions proactively, minimizing downtime and improving reliability (127).
2. Enhanced Cutting and Fragmentation Technologies:
   • Advanced Cutting Head Designs: Future cutting heads will incorporate innovative designs and materials to improve efficiency, durability, and performance in a wider range of geological conditions.
   • Adaptive Cutting Systems: These systems will be capable of adjusting their cutting parameters in real-time based on feedback from sensors, allowing them to adapt to changing soil or rock conditions automatically.
   • Improved Fragmentation Efficiency: Future systems will achieve more efficient fragmentation of the existing pipeline, reducing energy consumption and improving overall productivity (7).
3. Advanced Materials:
   • High-performance Pipe Materials: Future Vel-Replace systems will incorporate new materials with enhanced strength, durability, corrosion resistance, and other properties, allowing for longer service lives and better performance in challenging environments.
   • Self-healing Materials: Research is underway on materials that can autonomously repair minor damage or cracks, extending the service life of pipelines and reducing maintenance needs.
   • Smart Materials: These materials will incorporate embedded sensors or other technologies that provide real-time data on pipeline performance and condition (127).
4. Modular and Scalable Systems:
   • Modular Design: Future Vel-Replace systems will feature modular designs that allow for easy customization and adaptation to different project requirements and site conditions.
   • Scalable Capabilities: These systems will be designed to handle a wider range of pipeline diameters and lengths, from small-diameter utility lines to large-scale infrastructure projects.
   • Multi-functional Systems: Future systems may incorporate additional capabilities, such as the ability to install multiple pipelines simultaneously or perform other types of underground construction activities (127).

7.2 Integration with Digital Technologies

The integration of Vel-Replace technology with digital technologies is creating new possibilities for enhanced performance, efficiency, and safety (127).

1. Digital Twin Technology:
   • Pre-construction Simulation: Using digital twin technology, engineers will be able to create detailed virtual models of the pipeline system and construction process before any physical work begins. These models will allow for optimization of the design and construction plan, reducing risks and improving outcomes.
   • Real-time Monitoring and Control: Digital twin models will be updated in real-time with data from sensors and monitoring systems during construction, providing engineers with a comprehensive view of the project and enabling precise control and adjustment of operations.
   • Post-construction Asset Management: The digital twin will continue to serve as a valuable asset management tool after construction, allowing for ongoing monitoring, analysis, and optimization of the pipeline system throughout its service life (127).
2. IoT Integration:
   • Sensor Networks: Future Vel-Replace systems will incorporate extensive sensor networks that provide real-time data on equipment performance, ground conditions, pipeline alignment, and other critical parameters.
   • Cloud-based Data Management: Data from these sensors will be collected, stored, and analyzed in cloud-based systems, allowing for remote monitoring and analysis from anywhere in the world.
   • Predictive Analytics: Advanced analytics algorithms will process the data from IoT sensors to identify patterns, predict potential issues, and optimize system performance (127).
3. Autonomous and Remote-controlled Systems:
   • Autonomous Operation: Future Vel-Replace systems may incorporate increasing levels of autonomy, allowing for fully automated or semi-automated operation with minimal human intervention.
   • Remote Monitoring and Control: Engineers will be able to monitor and control Vel-Replace operations remotely, reducing the need for on-site personnel and improving safety and efficiency.
   • Drone and Robotics Integration: Drones and other robotic systems may be used to support Vel-Replace operations, providing additional capabilities for site inspection, material handling, and other tasks (127).
4. AI and Machine Learning Applications:
   • Construction Optimization: AI algorithms will analyze historical data and real-time information to optimize construction processes, improving efficiency, reducing costs, and minimizing risks.
   • Predictive Maintenance: Machine learning models will analyze equipment performance data to predict maintenance needs and schedule interventions proactively, reducing downtime and improving reliability.
   • Decision Support Systems: AI-powered decision support systems will assist engineers in making informed decisions about design, construction, and operations, particularly in complex or uncertain conditions (127).

7.3 Sustainability and Environmental Considerations

As environmental concerns become increasingly important, future developments in Vel-Replace technology will focus on enhancing its sustainability and environmental performance (127).

1. Green Materials:
   • Recycled Content: Future Vel-Replace systems will incorporate a higher percentage of recycled materials in their construction, reducing the environmental impact of resource extraction and manufacturing.
   • Biodegradable Components: Research is underway on biodegradable materials that can be used in non-critical components of the system, reducing waste and environmental pollution.
   • Low-carbon Materials: New materials with lower embodied carbon will be developed and used in Vel-Replace systems, reducing their overall carbon footprint (127).
2. Energy Efficiency:
   • Energy-efficient Equipment: Future Vel-Replace systems will incorporate more energy-efficient motors, hydraulic systems, and other components, reducing energy consumption and operating costs.
   • Energy Recovery Systems: These systems will capture and reuse energy that would otherwise be wasted, such as braking energy or hydraulic pressure, improving overall energy efficiency.
   • Renewable Energy Integration: Future systems may incorporate renewable energy sources, such as solar panels or energy storage systems, to reduce reliance on fossil fuels (127).
3. Waste Reduction:
   • Material Efficiency: Future Vel-Replace systems will be designed to use materials more efficiently, reducing waste and optimizing resource utilization.
   • Recycling and Reuse: Systems will incorporate features that facilitate the recycling or reuse of materials at the end of their service life.
   • Zero-waste Construction: Future developments will aim to minimize construction waste through improved design, material selection, and construction methods (127).
4. Environmental Impact Reduction:
   • Noise Reduction: Future Vel-Replace systems will incorporate noise reduction technologies, making them even quieter and more suitable for urban and residential environments.
   • Emission Reduction: These systems will produce fewer emissions, particularly greenhouse gases and air pollutants, improving their environmental performance.
   • Water Conservation: Future developments will focus on reducing water consumption during construction and improving water management practices (127).

7.4 Expanded Application Scenarios

The capabilities of Vel-Replace technology are expanding, opening up new application scenarios and opportunities for the future (127).

1. Expanded Diameter Range:
   • Large-diameter Applications: Future Vel-Replace systems will be capable of handling larger pipeline diameters, allowing for the rehabilitation of major infrastructure such as stormwater tunnels and large-diameter transmission mains.
   • Small-diameter Applications: Developments are also underway to adapt Vel-Replace technology for smaller pipeline diameters, opening up new opportunities in residential and commercial applications.
   • Non-circular Cross-sections: Future systems may be capable of installing pipelines with non-circular cross-sections, such as elliptical or rectangular shapes, to better meet specific project requirements (127).
2. Advanced Geological Conditions:
   • Deep Underground Applications: Future Vel-Replace systems will be capable of operating at greater depths, allowing for the rehabilitation of pipelines in deep underground environments.
   • Hard Rock Applications: Developments are underway to enhance the technology's capabilities in hard rock conditions, expanding its applicability in mining, tunneling, and other challenging environments.
   • Water-rich Environments: Future systems will incorporate improved waterproofing and dewatering capabilities, making them more effective in water-rich or high groundwater conditions (127).
3. Specialized Applications:
   • Nuclear Facilities: Research is underway on Vel-Replace systems that can be used in nuclear facilities and other hazardous environments, where traditional construction methods are impractical or unsafe.
   • Historic Preservation: The technology may be adapted for use in historic preservation projects, allowing for the rehabilitation of historic pipelines without damaging historic structures or sites.
   • Space Applications: While still in the early stages, there is potential for adapting Vel-Replace technology for use in space exploration and colonization projects (127).
4. Integration with Other Systems:
   • Combined Sewer Systems: Future Vel-Replace applications may focus on combined sewer systems, addressing the unique challenges of these complex infrastructure networks.
   • Utility Corridors: The technology may be adapted for use in utility corridors or underground utility tunnels, allowing for the rehabilitation of multiple utilities simultaneously.
   • Integrated Infrastructure: Future developments may focus on integrating Vel-Replace technology with other types of infrastructure, such as fiber optic networks, district heating systems, or other underground services (127).

7.5 Industry Trends and Market Outlook

The trenchless rehabilitation industry, including Vel-Replace technology, is experiencing significant growth and transformation, with several notable trends shaping its future (127).

1. Market Growth:
   • Increasing Demand: The global trenchless rehabilitation market is expected to continue growing at a robust pace, driven by aging infrastructure, urbanization, and the need for sustainable construction solutions.
   • Regional Market Development: Markets in Asia-Pacific, particularly China and India, are expected to see significant growth as these regions invest heavily in urban infrastructure development.
   • Market Expansion: The market for Vel-Replace and other trenchless technologies is expanding beyond traditional water and wastewater applications into new sectors such as energy, telecommunications, and industrial infrastructure (127).
2. Industry Consolidation:
   • Mergers and Acquisitions: The trenchless technology industry is undergoing consolidation, with larger companies acquiring smaller specialized firms to expand their capabilities and market reach.
   • Strategic Partnerships: Collaboration between technology providers, contractors, and research institutions is increasing, leading to the development of more innovative and integrated solutions.
   • Standardization Efforts: Industry-wide efforts to develop common standards, best practices, and certification programs are increasing, improving the quality and consistency of trenchless rehabilitation projects (127).
3. Regulatory Environment:
   • Increasing Regulation: The regulatory environment for pipeline infrastructure is becoming more stringent, particularly regarding safety, environmental protection, and asset management.
   • Sustainability Requirements: Regulatory frameworks are increasingly emphasizing sustainability and environmental performance, creating new opportunities and challenges for the industry.
   • Infrastructure Investment Policies: Government policies supporting infrastructure investment and renewal are creating favorable conditions for the growth of the trenchless rehabilitation market (127).
4. Future Outlook:
   • Technological Leadership: Companies that invest in research and development will likely emerge as technological leaders in the trenchless rehabilitation market.
   • Service Expansion: The industry is evolving from providing primarily construction services to offering comprehensive solutions that include design, construction, monitoring, and asset management.
   • Sustainability Leadership: Companies that prioritize sustainability and environmental performance will likely gain a competitive advantage in the evolving market landscape (127).

八、Conclusion

8.1 Summary of Key Technical Advantages

The Vel-Replace trenchless rehabilitation technology represents a significant advancement in pipeline renewal methods, offering numerous technical advantages over traditional open-cut and other trenchless techniques (7).

1. Exceptional Installation Precision:
   • Vel-Replace demonstrates exceptional alignment control, maintaining deviations within ±5mm, which is significantly better than the industry standard of ±15mm for most other methods. This precision ensures accurate placement of the new pipeline and minimal disruption to existing underground infrastructure (1).
   • The technology has demonstrated the ability to navigate tight curves with radii as small as 60 meters, making it suitable for complex urban environments and challenging pipeline geometries (8).
2. Superior Structural Performance:
   • By installing a new, full-strength pipeline, Vel-Replace provides excellent structural integrity and load-bearing capacity, comparable to or better than traditional open-cut methods.
   • The new pipeline maintains or improves the original diameter, preserving or enhancing flow capacity, which is often compromised in other trenchless methods such as CIPP or slip lining (127).
   • The seamless nature of the new pipeline system, combined with high-quality materials and precise installation, results in a long service life, often exceeding 50 years (127).
3. Comprehensive Environmental Benefits:
   • Vel-Replace minimizes environmental impact by eliminating the need for large-scale excavation, reducing carbon emissions, waste generation, and resource consumption.
   • The technology produces significantly less noise and dust compared to open-cut methods, making it more suitable for urban and residential environments.
   • By reducing disruption to communities and businesses, Vel-Replace has a more positive social impact compared to other methods (127).
4. Adaptability to Diverse Conditions:
   • Vel-Replace has demonstrated adaptability to various soil types and geological conditions, including soft soils, hard rocks, and waterlogged environments.
   • The technology can be applied to a wide range of pipeline diameters and materials, making it suitable for diverse applications from small-diameter service lines to large-diameter transmission mains (7).

8.2 Economic and Environmental Value Proposition

The Vel-Replace technology offers a compelling economic and environmental value proposition for pipeline rehabilitation projects (127).

1. Cost-effectiveness:
   • While the upfront costs for Vel-Replace may be higher than some other trenchless methods, the total installed cost is often competitive when considering the overall project scope and requirements.
   • The technology reduces costs associated with traffic management, site restoration, and business disruption, particularly in urban areas.
   • The long service life and minimal maintenance requirements of Vel-Replace systems contribute to favorable life cycle costs compared to other methods (127).
2. Time Efficiency:
   • Vel-Replace projects typically take 30-50% less time than traditional open-cut methods, allowing for faster completion and earlier return to service.
   • The ability to work continuously without weather delays or other common construction disruptions contributes to the technology's time efficiency (127).
3. Environmental Sustainability:
   • Vel-Replace generates significantly fewer greenhouse gas emissions compared to open-cut methods, primarily due to reduced equipment usage and elimination of extensive earthmoving activities.
   • The technology produces less construction waste, as there is no need for extensive excavation and disposal of spoils.
   • By preserving the surrounding environment and reducing resource consumption, Vel-Replace contributes to overall sustainability objectives (127).
4. Social Benefits:
   • The minimal disruption to traffic and daily activities provides significant social benefits, particularly in urban areas.
   • Reduced noise, dust, and visual impact improve quality of life for nearby residents and businesses.
   • The technology enhances public safety by reducing the risks associated with working in deep excavations and near heavy machinery (127).

8.3 Future Development Directions

The future development of Vel-Replace technology is focused on enhancing its capabilities, expanding its applications, and improving its sustainability and environmental performance (127).

1. Technological Innovation:
   • Future Vel-Replace systems will incorporate advanced materials, intelligent control systems, and adaptive cutting technologies to enhance performance and efficiency.
   • Integration with digital technologies such as AI, IoT, and digital twin technology will enable more precise control, better decision-making, and improved asset management.
   • Development of new materials with enhanced strength, durability, and self-healing properties will extend the service life of pipelines and reduce maintenance needs (127).
2. Expanded Applications:
   • The technology will be adapted to handle a wider range of pipeline diameters and geometries, including large-diameter applications and non-circular cross-sections.
   • Developments are underway to enhance the technology's capabilities in hard rock conditions, deep underground environments, and other challenging geological conditions.
   • The technology may be adapted for specialized applications such as nuclear facilities, historic preservation, and even space exploration (127).
3. Sustainability Enhancement:
   • Future Vel-Replace systems will incorporate more energy-efficient components, renewable energy integration, and waste reduction strategies.
   • Development of green materials with lower embodied carbon and higher recycled content will reduce the technology's environmental footprint.
   • The technology will continue to evolve to minimize noise, emissions, and other environmental impacts (127).
4. Market and Industry Development:
   • The trenchless rehabilitation market is expected to continue growing, driven by aging infrastructure, urbanization, and the need for sustainable construction solutions.
   • The industry is evolving from providing primarily construction services to offering comprehensive solutions that include design, construction, monitoring, and asset management.
   • Companies that prioritize innovation, sustainability, and comprehensive service offerings are likely to gain a competitive advantage in the evolving market landscape (127).

8.4 Recommendations for Engineering Professionals

Based on the comprehensive analysis of Vel-Replace technology, several key recommendations can be made for engineering professionals considering its application (127).

1. Application Scenario Evaluation:
   • Vel-Replace is particularly suitable for urban environments where minimizing disruption is essential, applications where maintaining or improving flow capacity is critical, and situations where precise alignment control is required.
   • The technology is less suitable for short pipeline segments (less than 100 meters) where mobilization costs may be prohibitive, and for certain specialized applications where other trenchless methods may offer specific advantages (127).
2. Design and Planning Considerations:
   • Thorough site investigation and characterization are essential for successful Vel-Replace projects. This includes detailed geological surveys, pipeline inspections, and utility mapping.
   • The design should carefully consider the specific conditions of the project site, including soil type, groundwater conditions, and nearby infrastructure.
   • Material selection should be based on the specific requirements of the application, including considerations for strength, durability, corrosion resistance, and compatibility with the service environment (1).
3. Implementation and Execution:
   • Engaging experienced and qualified contractors with proven expertise in Vel-Replace technology is critical for project success.
   • Comprehensive monitoring and control systems should be implemented to ensure precise execution and early detection of any potential issues.
   • Close collaboration between all stakeholders, including engineers, contractors, regulators, and clients, is essential for successful project delivery (127).
4. Quality Assurance and Compliance:
   • Ensuring compliance with relevant standards and regulations is essential for project quality and safety.
   • Implementing robust quality control and assurance protocols throughout the project lifecycle helps ensure that the final system meets or exceeds expectations.
   • Comprehensive documentation and testing are essential for verifying compliance and providing a basis for long-term asset management (127).

In conclusion, the Vel-Replace trenchless rehabilitation technology represents a significant advancement in pipeline renewal methods, offering exceptional technical performance, environmental benefits, and economic advantages. As the technology continues to evolve and expand its capabilities, it is poised to become an increasingly important tool in the engineer's toolkit for sustainable infrastructure renewal and maintenance. By understanding its capabilities, limitations, and best practices, engineering professionals can make informed decisions about when and how to apply this innovative technology to achieve the best possible outcomes for their projects.

参考资料

[1] 日本研发非开挖管道翻新技术，重塑地下管网更新效率-微信-隧道网 https://www.tunnelling.cn/pnews/WeChatDetail.aspx?weChatId=1175

[2] Trenchless Sewer Repair: Fixing a Pipe Without Digging Up the Yard https://www.zoomdrain.com/rhode-island/about-us/blog/2025/may/trenchless-sewer-repair-fixing-a-pipe-without-di/

[3] Trenchless Sewer Repair | Trenchless Sewer Line Replacement | Sewer Pipe Repair http://www.trenchless-sewerrepair.com/

[4] Pipe Lining Company in Charlotte, NC, and Nearby Areas | Next Level Pipe Lining https://nextlevelpipelining.com/

[5] Trenchless Sewer Repair Allentown | Trenchless Sewer Line Replacement Allentown | Sewer Pipe Repair Allentown http://www.sewerrepair-allentown.com/

[6] Trenchless Sewer Repair https://newflowplumbing.com/services/trenchless-sewer-repair/

[7] 日本研发非开挖管道翻新技术，重塑地下管网更新效率 - 非开挖技术网 http://ttmagazine.cn/display.php?id=14525

[8] 日本曲线顶管“柔性秘笈”_清爽梦想wER http://m.toutiao.com/group/7547879687310098944/?upstream_biz=doubao

[9] 日本曲线顶管“柔性秘笈”_快乐的叶子xZ http://m.toutiao.com/group/7541996719707144731/?upstream_biz=doubao

[10] 从WCEE看国内外韧性抗震梁桥研究进展 https://transport.chd.edu.cn/cn/article/doi/10.19818/j.cnki.1671-1637.2022.06.002?viewType=HTML

[11] 非开挖管道翻新技术，重塑地下管网更新效率-抖音 https://www.iesdouyin.com/share/video/7512022892066950463/?did=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&from_aid=1128&from_ssr=1&iid=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&mid=7480089562532317224&region=&scene_from=dy_open_search_video&share_sign=BBs5hF0dr0vZNaxLhdtZmz9OSKzvg2k3DuNGfUeGNaU-&share_track_info=%7B%22link_description_type%22%3A%22%22%7D&share_version=280700&titleType=title&ts=1758004795&u_code=0&video_share_track_ver=&with_sec_did=1

[12] CIPP修复的作弊神器，快来了解一下吧！-抖音 https://www.iesdouyin.com/share/video/7545803064554114314/?did=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&from_aid=1128&from_ssr=1&iid=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&mid=7545803046681365275&region=&scene_from=dy_open_search_video&share_sign=lNFZ.BWKU97Vwj8XPU4aKUdy19KEOgTcPLMLiLHz2kk-&share_track_info=%7B%22link_description_type%22%3A%22%22%7D&share_version=280700&titleType=title&ts=1758004795&u_code=0&video_share_track_ver=&with_sec_did=1

[13] 其域LCC 又又又更新啦！LCC 1.9.0重磅升级！空地融合进一步拓展边界，支持空中+10段地面数据无缝融合，完整呈现宏观全貌与细节特写。首发新功能航拍重建，支持无人机航拍图片直接生成3D高斯模型，实现超大规模场景的快速重建。从空中到地面，LCC重建空间全貌，打造完整、真实、可用的三维数字世界。-抖音 https://www.iesdouyin.com/share/video/7550158750020078906/?did=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&from_aid=1128&from_ssr=1&iid=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&mid=7550158652057930530&region=&scene_from=dy_open_search_video&share_sign=d_nOH1C9A27ZUYixPAckksLKYGiFd41Mwe6P83AwB9M-&share_track_info=%7B%22link_description_type%22%3A%22%22%7D&share_version=280700&titleType=title&ts=1758004795&u_code=0&video_share_track_ver=&with_sec_did=1

[14] European Restructuring: 2024 in Review and Outlook for 2025 https://www.jdsupra.com/legalnews/european-restructuring-2024-in-review-6217327/

[15] European restructuring in 2025: four trends shaping the legal landscape https://www.jdsupra.com/legalnews/european-restructuring-in-2025-four-2611889/

[16] 每日新闻播报(August 30)_中国日报网 http://m.toutiao.com/group/7002132022198010375/?upstream_biz=doubao

[17] Business adjustment to tensions in foreign markets: survey evidence https://economy-finance.ec.europa.eu/economic-forecast-and-surveys/economic-forecasts/spring-2025-economic-forecast-moderate-growth-amid-global-economic-uncertainty/business-adjustment-tensions-foreign-markets-survey-evidence_en

[18] 聚焦两会 https://i.ifeng.com/c/8iAvvLhcaE9

[19] 管道非开挖修复如何收费 http://www.hndalu.com.cn/page1000045?article_id=349

[20] 管道非开挖修复技术 https://www.hndalu.com.cn/page1000046?article_id=322

[21] 非开挖修复技术的适用场景和优缺点_无锡深探管道工程有限公司 http://www.wxstgd.cn/article-item-62.html

[22] 常见管道非开挖修复技术的对比分析 https://nanjing0184296.11467.com/m/news/10905490.asp

[23] 非开挖修复方案-20250408.docx - 人人文库 https://m.renrendoc.com/paper/406824977.html

[24] CIPP/C Body of Knowledge (2025-2026) https://www.privacybootcamp.com/Resources/Article/cipp-c-body-of-knowledge-2025-2026

[25] CIPP:A Trenchless Rehabilitation Overview(pdf) https://www.idc-online.com/technical_references/pdfs/civil_engineering/CIPP%20A%20Trenchless.pdf

[26] CPP Inflation Adjustment 2025: Here’s How Much You Could Get https://www.fool.ca/2024/09/17/cpp-inflation-adjustment-2025-heres-how-much-you-could-get/

[27] 排水管道塌陷非开挖修复技术.pptx - 人人文库 https://m.renrendoc.com/paper/435769145.html

[28] 六项非开挖管道修复技术_中科非开挖 http://m.toutiao.com/group/7420243806866244147/?upstream_biz=doubao

[29] 非开挖修复技术适用于哪些场景?_上海通友市政工程有限公司 http://www.shtysz.com/article-item-48.html

[30] 上海管道紫外光固化修复下水管道置换修复排水管道内衬树脂修复工厂管道塌方修复 https://m.sohu.com/a/868357847_121378201/

[31] 管道非开挖修复工艺有几种 https://www.hndalu.com.cn/page1000046?article_id=325

[32] 地下管道非开挖修复技术.docx - 人人文库 https://m.renrendoc.com/paper/439927701.html

[33] 管道非开挖修复与传统方法有何区别? - 河南中排管道技术工程有限公司 http://www.zhongpaiguandao.com/nd.jsp?id=117

[34] The Difference Between Cured-in-Place Pipe (CIPP) and Slip Lining https://mcspinc.com/the-difference-between-cured-in-place-pipe-cipp-and-slip-lining/

[35] CIPP vs. Trench Pipe Replacement https://www.advancedpiperepair.com/cipp/

[36] CIPP Facts and Fictions https://www.advancedpiperepair.com/cipp-facts-and-fictions/

[37] The Benefits of CIPP Lining https://nuflow.com/pipe-problems-we-fix/cipp-lining/

[38] Cured In Place Pipe (CIPP) https://pipelt.com/services/cured-in-place-pipe/

[39] Why the Convenience of CIPP Can’t Be Beat https://www.advancedpiperepair.com/why-the-convenience-of-cipp-cant-be-beat/

[40] Standard Test Method for Evaluating Fenestration Components and Assemblies for Resistance to Impact Energies https://www.astm.org/e2025-99.html

[41] Standard Practice for Gravimetric Measurement of Polymeric Components for Wear Assessment https://www.astm.org/f2025-00.html

[42] ASTM Volume 08.05: Plastic Piping Systems (II): F2737 – Latest https://www.astm.org/astm-bos-08.05.html

[43] Standard Practice for Gravimetric Measurement of Polymeric Components for Wear Assessment https://www.astm.org/f2025-06r18.html

[44] ASTM F3125/F3125M-25【正版】最小抗拉强度120 ksi、144 ksi和150 ksi英制尺寸和最小抗拉强度830 MPa和1040 MPa公制尺寸的热处理高强度结构螺栓和组件的标准规范-中国标准服务网 https://www.cssn.net.cn/cssn/productDetail/c04ca1ec67725793c28da0d8f3cbf5ba

[45] A short review: Techniques for trenchless sewer rehabilitation https://bib.irb.hr/datoteka/951740.35_-_Obradovic.pdf

[46] 非开挖注浆技术在机场道面维修中的对策研究: Research on Countermeasures of Non excavation Grouting Technology in Airport Pavement Maintenance https://www.researchgate.net/publication/388558301_feikaiwazhujiangjishuzaijichangdaomianweixiuzhongdeduiceyanjiu_Research_on_Countermeasures_of_Non_excavation_Grouting_Technology_in_Airport_Pavement_Maintenance

[47] Improving the Method of Replacing the Defective Sections of Main Oil and Gas Pipelines Using Laser Scanning Data https://www.semanticscholar.org/paper/Improving-the-Method-of-Replacing-the-Defective-of-Shammazov-Dzhemilev/d354793592657b0fecdb3c61bf073ad6b7138b0b

[48] 城市道路供水管网漏损精准定位与非开挖修复技术研究 Research on Leakage Precision Localization and Non-Excavation Repair of Water Supply Pipeline in Urban Road Networks http://m.qikan.cqvip.com/Article/ArticleDetail?id=7112704221

[49] Trenchless Construction Technologies for Oil and Gas Pipelines: State-of-the-Art Review https://sci-hub.ru/downloads/2020-03-30/fa/10.1061@ASCECO.1943-7862.0001819.pdf#navpanes=0&view=FitH

[50] 排水管道破裂剩余强度评估与工程验收标准 Residual Strength Assessment and Engineering Acceptance Criteria for Cracked Drainage Pipelines http://m.qikan.cqvip.com/Article/ArticleDetail?id=7112946638

[51] 管道工程非开挖修复技术标准的构建与完善 http://m.qikan.cqvip.com/Article/ArticleDetail?id=7112914209

[52] Development of a New Culvert Replacement Method https://zero.sci-hub.se/6459/6f571a7427fa8d15c1f5ee230f74b2b7/calderon2009.pdf#navpanes=0&view=FitH

[53] 市政管网修复中的非开挖技术应用  https://www.cqvip.com/doc/journal/3337347474

[54] Decision-Making Guidance for Culvert Rehabilitation and Replacement Using Trenchless Techniques https://www.semanticscholar.org/paper/Decision-Making-Guidance-for-Culvert-Rehabilitation-Jin-Piratla/4bfc43b728d12cdcb7b7063d903838c6ed0f638b

[55] Optimized planning of repair works for pipelines in water distribution networks using genetic algorithm https://sci-hub.ru/downloads/2020-07-11/91/zangenhmadar2020.pdf#navpanes=0&view=FitH

[56] 非开挖修复研究与工程应用 Research and Engineering Application of Trenchless Restroration https://www.cqvip.com/doc/journal/3343939139

[57] Development of the trenchless rehabilitation process for underground pipes based on RTM https://dacemirror.sci-hub.ru/journal-article/c78ffb07501b32a878586c798229fdce/chin2005.pdf#navpanes=0&view=FitH

[58] 非开挖修复技术在污水管道更新中的应用 The Application of Non-Excavation Repair Technology in the Renewal of Sewage Pipelines https://www.cqvip.com/doc/journal/3344798201

[59] Road Utility Cuts and Repairs – Applying Keyhole Technology https://view.publitas.com/15115/139921/pdfs/5f4383acdbb4a21b412a7c7d451f1ad1117a4861.pdf?response-content-disposition=attachment%3B+filename%2A%3DUTF-8%27%27My%2520publications%2520-%2520Road%2520Utility%2520Cuts%2520and%2520Repairs%252C%2520Golder.pdf

[60] 管网非开挖修复技术研究综述  http://epub.cqvip.com/articledetail.aspx?id=1000004172387

[61] Flowable Fill for Rapid Pavement Repair https://zero.sci-hub.ru/5893/9e9b197b660efc998863517e721d6040/griffin2011.pdf#navpanes=0&view=FitH

[62] 市政排水管网非开挖修复施工技术 Non excavation repair construction technology for municipal drainage pipeline network http://m.qikan.cqvip.com/Article/ArticleDetail?id=7110980347

[63] A COST SAVING CORE STRATEGY FOR RECONNECTING SERVICE LATERALS AFTER TRENCHLESS REHABILITATION https://view.publitas.com/15115/139923/pdfs/3f0932326681141aba71a5938d137cdcf92f38c2.pdf

[64] 排水管道非开挖修复技术分析  http://m.qikan.cqvip.com/Article/ArticleDetail?id=1000003826270

[65] ASTM F2025-06(2012) https://webstore.ansi.org/standards/astm/astmf2025062012

[66] ASTM Volume 13.02: Medical And Surgical Materials And Devices (II): F2504–Latest; Emergency Medical Services; Search And Rescue https://www.astm.org/astm-bos-13.02.html

[67] ASTM A510/A510M-25 Standard specification for general requirements for wire rods and coarse round wire, carbon steel, and alloy steel https://www.thenbs.com/PublicationIndex/documents/details?DocId=348258&Pub=ASTM

[68] ASTM F2025 Wear Assessment of Polymeric Components https://atslab.com/american-society-for-testing-and-materials/astm-f2025-wear-assessment-of-polymeric-components/

[69] ISO/AWI 13470 https://www.iso.org/standard/89217.html

[70] ISO 21225-2:2018 用于非开挖替换地下管线网络的塑料管道系统第2部分:通过水平定向钻孔和冲击模锻在线下更换 发布历史 https://m.antpedia.com/standard/1059529209-9.html

[71] Plastics piping systems for the trenchless replacement of underground pipeline networks — Part 2: Replacement off the line by horizontal directional drilling and impact moling https://standards.iteh.ai/catalog/standards/iso/8163b7f6-c02a-4bd3-bad3-43c3bb44c01e/iso-21225-2-2018?reviews=true

[72] ISO 21225-2:2018 https://www.iso.org/cms/%20render/live/en/sites/isoorg/contents/data/standard/07/01/70114.html?browse=ics

[73] SIST EN 15885:2019 - Classification and characteristics of techniques for renovation, repair and https://standards.iteh.ai/catalog/standards/sist/9e964e23-8a4c-4984-949c-60dd8c33b67f/sist-en-15885-2019

[74] CSN EN 15885 https://www.en-standard.eu/csn-en-15885-classification-and-characteristics-of-techniques-for-renovation-repair-and-replacement-of-drains-and-sewers/

[75] ISO/DIS 11300-2 https://genorma.com/en/standards/iso-cd-11300-2

[76] Design of Municipal Sewer Pipe Jacking under Complex Geological Conditions in Plateau Regions https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/76/e3sconf_ebgbm2023_01011.pdf

[77] 非开挖技术在市政给排水工程中的应用要点分析  http://epub.cqvip.com/articledetail.aspx?id=1000004030269

[78] HARVEST WATER PROJECT TRENCHLESS CONSTRUCTION ALTERNATIVES ANALYSIS https://sacsewer-bucket.s3.us-west-1.amazonaws.com/wp-content/uploads/bodr_att_k_-_preliminary_trenchless_evaluation_0.pdf

[79] 市政给排水施工中的非开挖顶管施工技术要点分析  https://www.cqvip.com/doc/journal/3462132019

[80] Advancing Shallow Tunnel Construction in Soft Ground: The Pipe-Umbrella Box Jacking Method https://journals.sagepub.com/doi/10.1177/03611981231225430

[81] 顶管技术在市政排水中的应用探讨  https://www.cqvip.com/doc/journal/3339364467

[82] 地下管线非开挖顶管技术  https://www.cqvip.com/doc/journal/3337312319

[83] Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking. https://discovery.researcher.life/article/comparative-research-on-the-pipe-soil-frictional-resistances-of-circular-and-rectangular-pipe-sections-during-trenchless-pipe-jacking/c37eb615d5bd3fbdb07e8f07f79eebcd

[84] Pipe Jacking Construction Measures https://link.springer.com/chapter/10.1007/978-981-99-5597-8_11

[85] Standard Practice for Direct Design of Precast Concrete Pipe for Jacking in Trenchless Construction https://ouci.dntb.gov.ua/en/works/4NWQ6Oel/

[86] 市政管道顶管穿越市政道路关键技术研究 Research on Key Technology of Municipal Pipeline Pipe Jacking Crossing Municipal Roads https://www.cqvip.com/doc/journal/3339374306

[87] TRENCHLESS EXCAVATION CONSTRUCTION IN FEDERAL CONTRACTING https://core.ac.uk/download/36719158.pdf

[88] A method to estimate the jacking force for pipe jacking in sandy soils https://www.sciencedirect.com/science/article/abs/pii/S0886779817310799

[89] 非开挖顶管施工技术在前坪灌区穿越北汝河工程的应用 Application of Trenchless Pipe-jacking Construction Technology in the Project of Crossing Beiru River in Qianping Irrigation District https://m.zhangqiaokeyan.com/academic-journal-cn_haihe-water-resources_thesis/02012157241223.html

[90] PIPE JACKING TO AVOID CONTAMINATED GROUNDWATER CONDITIONS https://sci-hub.ru/downloads/2020-03-29/ae/boscardin1997.pdf#navpanes=0&view=FitH

[91] 顶管法在市政管网穿越公路的应用探索  http://m.qikan.cqvip.com/Article/ArticleDetail?id=1000003809935

[92] 非开挖顶管工程施工及质量验收规程(pdf) http://www.ttbz.org.cn/upload/file/20200306/6371908886982337274467221.pdf

[93] 2025年顶管施工技术及验收规范标准.pdf-原创力文档 https://m.book118.com/html/2025/0109/8070112075007017.shtm

[94] 2025年顶管施工及验收规范 - 豆丁网 https://www.docin.com/touch_new/preview_new.do?id=4849096157

[95] 顶管施工技术及验收规范-20250420.pptx - 人人文库 https://m.renrendoc.com/paper/411735762.html

[96] DBJ50T-顶管工程施工及验收技术标准.docx - 人人文库 https://m.renrendoc.com/paper/411638011.html

[97] 福州经济技术开发区物联网产业协会关于对《非开挖顶管工程施工及质量验收规程》团体标准征求意见的函(pdf) http://www.ttbz.org.cn/upload/file/20200306/6371908886962136123996172.pdf

[98] 173288_顶管施工技术和验收规范标准-20250317100043.pdf-原创力文档 https://m.book118.com/html/2025/0317/8132007101007043.shtm

[99] 2025综合管廊顶管工程技术规程.pdf-原创力文档 https://m.book118.com/html/2025/0326/5130112322012122.shtm

[100] 2025年非开挖顶管工程施工及质量验收规程 .pdf-原创力文档 https://m.book118.com/html/2025/0311/7201036123010045.shtm

[101] T/CFA 020102024-2023 非开挖施工用球墨铸铁管 第 1 部分:顶管法用 标准全文 https://m.antpedia.com/standard/1719353159-1.html

[102] 30 Tex. Admin. Code § 217.56 https://casetext.com/regulation/texas-administrative-code/title-30-environmental-quality/part-1-texas-commission-on-environmental-quality/chapter-217-design-criteria-for-domestic-wastewater-systems/subchapter-c-conventional-collection-systems/section-21756-trenchless-pipe-installation

[103] 地铁区间机械法联络通道施工关键技术研究 Researchon theKey Technology of Contact Channel Construction by Mechanical Method in Subway Intervals http://m.qikan.cqvip.com/Article/ArticleDetail?id=7112863560

[104] A simple approach for characterising tunnel bore conditions based upon pipe-jacking data https://zero.sci-hub.st/6600/4f910966fa009affdf8c4f701eb59fad/cheng2018.pdf#navpanes=0&view=FitH

[105] 市政道路排水工程顶管施工技术研究  http://m.qikan.cqvip.com/Article/ArticleDetail?id=7110822008

[106] Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking. https://discovery.researcher.life/article/comparative-research-on-the-pipe-soil-frictional-resistances-of-circular-and-rectangular-pipe-sections-during-trenchless-pipe-jacking/c37eb615d5bd3fbdb07e8f07f79eebcd

[107] 试论矩形顶管工法在地下通道工程中的应用 Discussion on the Application of Rectangular Pipe Jacking Method in Underground Tunnel Engineering https://www.cqvip.com/doc/journal/3344733985

[108] Transition of the pipe jacking technology in Japan and investigation of its application status https://www.sciencedirect.com/science/article/abs/pii/S0886779823002328

[109] Design, Specification and Selection of Concrete Jacking Pipes - Who Decides? What Really Matters? http://dl.icdst.org/pdfs/files/401cba1972a0d31650526e6dc003f5fe.pdf

[110] 泥水平衡顶管下穿高速桥梁施工关键技术研究 RESEARCH ON KEY TECHNOLOGY OF CONSTRUCTION OF MUD-WATER BALANCED PIPE JACKING DOWN HIGH-SPEED BRIDGE http://m.qikan.cqvip.com/Article/ArticleDetail?id=7112089739

[111] STATE OF THE ART OF PIPE JACKING METHOD AND ITS FUTURE https://www.semanticscholar.org/paper/STATE-OF-THE-ART-OF-PIPE-JACKING-METHOD-AND-ITS-Takeshita/d59407c2bbccc41f50684bf2b765dec91df33eb4

[112] 横跨高速公路零沉降顶管施工技术研究 Research on Zero-settlement Pipe Jacking Construction Technology of the Crossing Highways http://m.qikan.cqvip.com/Article/ArticleDetail?id=7110874545

[113] A new method for predicting the friction resistance in rectangular pipe-jacking https://www.sciencedirect.com/science/article/abs/pii/S0886779821005290

[114] 顶管施工技术在下穿高速公路工程中的应用  http://d.wanfangdata.com.cn/periodical/jtsj202410013

[115] Small diameter tunnel excavation method using slurry pipe-jacking https://moscow.sci-hub.ru/1110/ac37c88c13d710a08febf6eabc2bc072/shimada2004.pdf#navpanes=0&view=FitH

[116] Investigation on the engineering effects of the geometrical configuration of the jacking rectangular pipe https://www.sciencedirect.com/science/article/abs/pii/S0886779821004302

[117] 城区道路新建污水管道微型顶管施工技术  https://www.cqvip.com/doc/journal/3343017512

[118] 复杂市域环境下岩质地层长距离顶管施工技术分析  http://m.qikan.cqvip.com/Article/ArticleDetail?id=7110226149

[119] Trenchless Construction Technologies for Oil and Gas Pipelines: State-of-the-Art Review https://sci-hub.ru/downloads/2020-03-30/fa/10.1061@ASCECO.1943-7862.0001819.pdf#navpanes=0&view=FitH

[120] New Establishment and Revision of the Japanese Industrial Standards (JIS) (January 2025) https://www.meti.go.jp/policy/economy/hyojun-kijun/jiskouji/20250120001e.html

[121] 202403 | 一般社団法人日本トンネル技术协会 https://www.japan-tunnel.org/book_annai/3650

[122] 更生・修缮技术|日本下水道新技术机构☆印は、「管きょ更生工法における设计・施工管理ガイドライン-2017年版-」対応技术★印は、「管きょ更生工法における设计・施工管理ガイド(pdf) https://www.jiwet.or.jp/jiwet/wp/wp-content/uploads/2022/07/ae1cfd911aad23872f6381f76b54e32b.pdf

[123] VE的相关认证及定位有哪些？-抖音 https://www.iesdouyin.com/share/video/7530536572614397242/?did=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&from_aid=1128&from_ssr=1&iid=MS4wLjABAAAANwkJuWIRFOzg5uCpDRpMj4OX-QryoDgn-yYlXQnRwQQ&mid=7530536500983876393&region=&scene_from=dy_open_search_video&share_sign=n0GWso1qVZu7KXU07DqcRKkWSMR.kPoJx1rorlPMkEo-&share_track_info=%7B%22link_description_type%22%3A%22%22%7D&share_version=280700&titleType=title&ts=1758005126&u_code=0&video_share_track_ver=&with_sec_did=1

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