Storm drain pvc pipe is the core component of modern drainage system, mainly used to collect and divert surface rainwater to prevent urban waterlogging. Its core advantages include:
Lightweight: The density is only 1/5 of cast iron pipe, which greatly reduces transportation and installation costs.
Corrosion resistance: It has natural resistance to acid, alkali, salt spray and microbial erosion, and its service life can reach more than 50 years.
Low flow resistance: The inner wall is smooth (Manning coefficient n≈0.009), and the drainage efficiency is 20%-30% higher than that of concrete pipe.
1. International standards
ASTM D3034: Standardizes the dimensional tolerance and bursting pressure of PVC rainwater pipes, requiring DN200 pipes to withstand ≥1.2MPa hydrostatic pressure.
EN 1401: The EU standard stipulates that the ring stiffness must be ≥8kN/m² (SN8 grade) to cope with buried loads.
2. Chinese Standards
GB/T 20221-2006: specifies the physical properties of PVC-U pipes for non-pressure buried drainage, such as longitudinal shrinkage rate ≤5%.
CECS 122:2001: Technical regulations require that the slope of rainwater pipes be ≥0.5% and the flow rate be controlled at 0.6-3m/s to prevent siltation.
1. Flow calculation model
Use Manning formula to calculate drainage capacity:
Q = (1/n) × A × R^(2/3) × S^(1/2)
Where:
Q is the flow rate (m³/s)
A is the cross-sectional area of the water flow
R is the hydraulic radius
S is the pipe slope
Example: DN300 PVC pipe with a slope of 0.8%, the full pipe flow can reach 0.12m³/s, meeting the rainfall demand of a 10-year return period.
{C}2. {C}Typical application scenarios
|
Application Scenario |
Pipe Diameter Selection |
Key Technical Requirements |
|
Municipal Road Drainage |
DN400–DN600 |
Ring stiffness ≥ SN8 |
|
Building Roof Rainwater Pipes |
DN110–DN160 |
UV-resistant modified formulation |
|
Industrial Park Drainage |
DN200–DN400 |
Anti-chemical corrosion coating |
1. Trench specifications
When the burial depth is ≤3m, the trench bottom width = pipe diameter + 300mm;
The foundation needs to be laid with a 100mm thick sand cushion layer, and the compaction degree is ≥90%.
2. Connection technology
Socket-type adhesive: suitable for pipes DN≤200mm, curing time ≥30 minutes;
Rubber ring seal: recommended for large pipe diameters, allowing ±3° deflection angle.
Intelligent pipeline system: integrated flow sensor (such as ultrasonic Doppler probe), real-time data upload to the municipal management platform;
Nano-modified PVC: adding graphene to improve impact strength (up to 60kJ/m²), suitable for earthquake zones.
Take a city development zone project as an example:
|
Item |
PVC Pipe Solution |
Concrete Pipe Solution |
|
Material Cost |
120 RMB/m |
180 RMB/m |
|
Installation Labor |
40 RMB/m |
80 RMB/m |
|
50-Year Maintenance Cost |
150,000 RMB/km |
450,000 RMB/km |
Storm drain pvc pipe has become the first choice for modern drainage projects due to its comprehensive performance advantages. In the future, with the in-depth application of BIM technology (such as pipeline collision detection) and stricter environmental regulations (such as RoHS heavy metal restrictions), the industry will develop in the direction of high performance and digitalization.
