It is a high-performance pipe that overcomes the weaknesses of concrete’s brittleness through the principle of primary dynamics. Its core value lies in providing reliable solutions for critical water supply projects with large diameters, high internal pressures, and long lifespans.
I. Core Principles
Active reinforcement: Before or after the hardening of the concrete, the internal high strength reinforcer or wire is stretched to give it elastic pull.
Effects: After relaxing the pull, the retraction force of the reinforcing steel forms a continuous pre-pressure stress on the concrete. This pre-pressure can effectively offset the tensile stress generated by the internal water pressure or external loading of the pipe during use, thereby radically inhibiting concrete cracking.
II. Main advantages
High crack resistance and high leak resistance: Pre-pressure stress makes the tube almost free of cracks, and the sealing is excellent.
Excellent pressure bearing capacity: designed for medium and high pressure water transmission, working pressure is usually 0.4-2.0MPa, suitable for the main line.
Long service life: The design life is often more than 50 years, and the full life cycle maintenance cost is low.
Large stiffness and strong resistance to external loads: it can withstand deep burial pressure and construction top force, and is suitable for non-boring projects such as top pipes.
III. Typical Applications
Urban water mains network
Large-scale trans-regional water transfer projects (e.g. South-North Water Transfer)
Circulatory water pipes at power plants and nuclear power plants
Pressure drainage and irrigation systems
IV. Main types
PCCP: built-in steel cylinder, the strongest pressure impermeable performance, is the first choice for large high-pressure projects.
CTP: No steel cylinder, economical and practical, suitable for scenarios with slightly lower pressure requirements.
Performance
Excellent mechanical properties
High crack resistance: Pre-pressure stress effectively offsets the tensile stress generated by the working load (internal water pressure, external earth pressure), significantly inhibits and delays crack production, and achieves “crack control.”
High pressure capacity: Designed for high pressure, the working pressure range is usually 0.4 MPa to 2.0 MPa or higher, which is a key feature of long distance, large diameter water mains.
High stiffness and resistance to external pressure: The tube body is highly stiff, can withstand deep earth loading and top tube construction thrust, and is suitable for complex construction and deep burial environments.
Excellent durability and reliability
Exceptional permeability: Very low fracture risk combined with precision interface sealing (such as double rubber rings) ensures the overall sealability of the piping system with extremely low leakage rates.
Extended service life: Pre-stress wire is densely protected by high-strength concrete and has a low risk of corrosion. The design life span is usually more than 50 years and there is almost no need for maintenance throughout the life cycle.
Excellent fatigue resistance: The performance is stable under circulating pressure or load, and is suitable for pressure lines used in changing working conditions.
Good integrated engineering performance
The interface seal is reliable: The standard flexible interface (socket type + rubber ring) allows a trace deviation, adapts to foundation subsidence, and ensures sealing.
Excellent hydraulic performance: the inner wall is smooth (especially the centrifugal process), the resistance is small, the water supply capacity is large and the long-term stability is stable.
High design flexibility: The degree of prestress, reinforcement and structure can be adjusted (e.g. PCCP or CTP) to precisely meet the needs of different pressures, diameters and geological conditions.
Application
Urban water supply main network.
Large-scale cross-regional water diversion projects (e.g., the South-North Water Transfer Project).
Circulating water pipelines for power plants and nuclear power stations.
Pressure drainage and irrigation systems.
Specifications
Core Specification Parameters
| Parameter | Typical Range | Description |
|---|---|---|
| 1. Nominal Inner Diameter | DN600 – DN4000 mm | Its technical and economic advantages are most prominent in large-diameter (DN≥600) pressure water transmission applications. Larger diameters are customizable. |
| 2. Effective Length | 5 m, 6 m (Standard pipe section) | Long single-section length reduces the number of pipeline joints, improving installation efficiency and overall integrity. |
| 3. Working Pressure Rating | 0.4 MPa – 2.0 MPa (or higher) | Core design indicator. Must be determined based on a comprehensive analysis of the project’s internal water pressure, soil cover depth, and surface loads. Common classifications include 0.4, 0.6, 0.8, 1.0, 1.2 MPa, etc. |
| 4. Soil Cover Depth Rating | 3 m – 10 m (or higher) | Indicates the pipe’s capacity to withstand external earth loads. Together with the pressure rating, it forms the dual foundation for structural design. |
| 5. Joint Type | Bell-and-Spigot with Steel Collar + Dual Rubber Gasket Seal (Mainstream for PCCP) | The dual-gasket design provides double sealing assurance, allows for minor deflection, offers extremely high reliability, and enables quick installation. |
| 6. Structural Type | PCCP (Prestressed Concrete Cylinder Pipe) CTP (Core Type Prestressed Concrete Pipe) |
PCCP: Contains an embedded steel cylinder, offering top-tier pressure resistance and impermeability. Suitable for high-pressure trunk mains. CTP: No steel cylinder, offers excellent performance and is more economical. Suitable for applications with slightly lower pressure requirements. |
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