Return to list

What method should be used to install plastic pipes when crossing a river?

2019-03-15

When plastic pipes cross rivers, it’s essential to first determine the riverbed’s geological structure—specifically, whether there’s an impact from river pebbles—and decide if protective walls are needed. Crossing should ideally be done during winter when water levels are low. Common methods include cofferdam techniques, pipe jacking, and buoyancy-based approaches. Among these, the cofferdam method is widely used. Here’s how it works: A cofferdam is constructed to block about two-thirds of the river’s width at one end of the crossing point. Water inside the cofferdam is then pumped out completely. Once the area is clear, a trench is dug within the cofferdam, and the pipe is laid. To prevent sewage from entering, the pipe openings are sealed tightly. After backfilling is complete, the adjacent cofferdam section is reinstalled, and the process of pumping out water, digging the trench, connecting the pipe, and backfilling is repeated until the entire crossing is finished.

The cofferdam method requires attention to the following issues:

1. It can block water when the water level rises.

2. The depth of backfill soil covering navigable rivers should be less than one meter.

3. The backfill height must not exceed the riverbed elevation.

4. It is recommended to use a flexible interface.

Previous page:

What preparations should be made before conducting a pipeline pressure test?

Next page

According to the Integrated Wastewater Discharge Standards, is a PVC-U drainage pipe suitable for discharge requirements?

Online Quotation Request

Our staff will contact you as soon as possible—please keep your phone lines open!

Submit
%{tishi_zhanwei}%