What is Open cut technique?

The open cut trench method involves excavating down to and exposing the existing pipe so that it can be repaired or replaced and then backfilled. If the open cut trench excavation is located in a non-pavement area the excavation can be backfilled with soil and surface vegetation restored by seed or sod.

What is an open cut pipeline?

What Does Open Cut Mean? Open cut, as the name implies, is a method of pipeline installation that requires opening up the surface of the ground to the required depth for installing a pipeline.

How do pipelines cross rivers?

There are several ways to get a pipeline across a river or a stream. One option is to dam up the river and dig a trench across it to bury the pipe. Another is to tunnel underneath the water, using a technique called horizontal directional drilling.

What is open cut road crossing?

Roads – Open Cut. 1.1. 11 Minor roads may also be open cut, involving the excavation of the trench across the road. The method is likely to be applied to small single track roads which will typically require a temporary road closure during the crossing works.

How are pipelines built under rivers?

Pipelines cross existing roads, highways, streams, rivers and wetlands. Typically, pipelines are constructed underneath these obstacles by either boring for shallow depth or using horizontal directional drilling (HDD) for deeper placement.

What are tunnels used for?

Tunnels are underground passages used for transportation. They could be used for carrying freights and passengers, water, sewage, etc Tunnels are more economical than open cuts beyond certain depths. Tunnels avoid disturbing or interfering with surface life and traffic during construction.

What is a trenchless pipeline?

Trenchless technique. Road or Rail Boring – This technique involves digging a hole where a boring machine can sit level with the depth where the pipe will be installed under the road or railway. The boring machine is then used to bore under the road or railway.