HDPE pipe for stormwater management has become an important part of modern stormwater management systems. Its excellent performance perfectly meets the various needs of stormwater management:
1. Excellent hydraulic performance: the inner wall is smooth (roughness coefficient is only 0.009), friction loss is small, and the flow capacity can be increased by more than 30% compared with concrete pipes, significantly reducing the pipe diameter requirements.
2. Excellent impact resistance: It can withstand impact loads during construction and use, and is particularly suitable for installation under urban roads that may be impacted by external forces.
3. Excellent corrosion resistance: It can completely resist chemical substances in rainwater and electrochemical corrosion in soil, and its service life can reach 50-100 years, which is much higher than traditional materials.
4. Excellent flexibility: It can adapt to a certain degree of uneven foundation settlement (allowing 3-5% radial deformation), and has excellent seismic performance.
5. Lightweight design: The weight is only 1/8 of the concrete pipe and 1/4 of the steel pipe, which greatly reduces the transportation and installation costs.
6. Environmental protection characteristics: The material is recyclable, the production energy consumption is low, and it will not cause secondary pollution to rainwater.
1. Urban road drainage system: the main and branch pipe network for road rainwater collection and discharge.
2. Building community rainwater system: rainwater drainage pipe network in residential areas, commercial areas, and industrial parks.
3. Rainwater infiltration system: rainwater retention and recharge underground system combined with infiltration structure.
4. Storm management facilities: inlet and outlet pipes and connecting pipes of large rainwater storage tanks.
5. Green infrastructure: pipeline systems supporting LID facilities such as rainwater gardens and bioretention ponds.
6. Airport and port drainage: rapid drainage system for large paved areas.
1. Material standard: PE100 or PE100-RC grade raw materials are usually used, which meet the requirements of ISO 4427, GB/T 13663 and other standards.
2. Structural type:
Solid wall pipe: suitable for general pressure requirements
Corrugated pipe: suitable for large diameter non-pressure or low pressure occasions
Wrapped reinforced pipe: ultra-large diameter rainwater drainage system
3. Size range: The diameter ranges from DN200 to DN2000, which can be selected according to the drainage volume requirements.
4. Ring stiffness level: Common SN4, SN8, SN12.5, etc., determined according to the burial depth and ground load.
5. Connection method:
Socket-type electric fusion connection (small diameter)
Butt-melt connection (large diameter)
Clamp-type mechanical connection (special node)
6. Color identification: usually black or blue, and can also be customized according to needs.
1. Hydraulic calculation: Use Manning formula to accurately calculate the pipe diameter, considering the initial rainfall scouring effect.
2. Burial depth design: Combined with the frost line depth and ground load requirements, it is usually not less than 0.7m.
3. Foundation treatment: Select sand base bed or concrete foundation according to soil conditions to ensure uniform support.
4. Pipeline slope: Self-cleaning flow rate is not less than 0.6m/s, and can be reduced to 0.3m/s under special circumstances.
5. Inspection well setting: The spacing is generally not more than 30m, and it must be set at the turning, diameter change and intersection of the pipeline.
6. Anti-floating design: Anti-floating measures such as concrete weighting and anchoring are required in areas with high groundwater levels.
1. Rainwater collection and reuse system: connected to water storage facilities to realize rainwater collection, storage and utilization.
2. Intelligent drainage system: integrated flow monitoring sensors to realize real-time monitoring and intelligent scheduling of rainwater discharge.
3. Sponge city construction: as a key component of the "seepage, stagnation, storage, purification, use and discharge" technical system of sponge cities.
4. Modular rainwater management system: prefabricated HDPE pipe components to greatly improve construction efficiency.
5. Ecological drainage channel: combined with ecological revetment technology, a rainwater discharge system with ecological functions is constructed.
1. Pipe acceptance: check appearance quality, dimensional tolerance, material certification documents and third-party inspection reports.
2. Trench excavation: strictly control the width and slope of the trench bottom to avoid over-excavation and disturbance of the original soil.
3. Pipeline installation:
Keep the pipeline straight and avoid forced bending
Control temperature, pressure and time parameters during hot melt connection
Electrofusion connection ensures that the connection surface is clean and dry
4. Backfill quality control: backfill in layers (each layer does not exceed 20cm), compact symmetrically, and control the density ≥95%.
5. Pressure test: closed water test or air tightness test to ensure the sealing performance of the system.
6. Completion acceptance: comprehensive inspection of parameters such as pipeline position, elevation, slope, etc.
|
Comparison Item |
HDPE Piping |
Concrete Piping |
Metal Piping |
|
Service Life |
50-100 years |
20-30 years |
15-25 years |
|
Hydraulic Performance |
Excellent |
Moderate |
Good |
|
Corrosion Resistance |
Outstanding |
Good |
Poor |
|
Construction Efficiency |
High |
Low |
Medium |
|
Maintenance Cost |
Low |
High |
High |
|
Environmental Friendliness |
High |
Moderate |
Low |
With the acceleration of urbanization and the change in rainfall patterns caused by climate change, efficient and reliable rainwater management systems have become increasingly important. With its comprehensive performance advantages, HDPE pipes are gradually replacing traditional drainage pipes around the world and becoming the first choice for modern rainwater management systems.
