Trenchless Repair

Published: July 29, 2017 | Last updated: July 5, 2023

What Does Trenchless Repair Mean?

A trenchless repair uses the methods of trenchless construction to restore or improve the stability, integrity or usefulness of an underground conduit or pipe. The methods used include cured-in-place pipe (CIPP), relining and — for small sections where the entire pipe or conduit does not require rehabilitation — mechanical spot repair.


Trenchlesspedia Explains Trenchless Repair

The methods used in trenchless repair or rehabilitation include CIPP, a method where a soft, resin-saturated tube is pulled into a pipe or conduit to act as a liner. Compressed air or water is then forced into the liner so that it expands and attaches itself to the existing pipe’s interior. Depending on the resin, hot water, ultraviolet light or steam is introduced into the pipe to cure the resin in the liner, stabilizing it in place and forming a “pipe within a pipe” and completing the repair.

Methods also include pipe relining, a process similar to CIPP — the pipe within a pipe concept — except that it involves the introduction of an actual pipe, rather than a cured in place liner, into the existing pipe or conduit.The only issue with pipe relining is a minor reduction in the diameter of the pipe or conduit.

Mechanical spot repair is similar to relining. A short section of pipe or liner is inserted into the existing pipe at the location of the damage. The short section of pipe or liner seals the damaged area.


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