In trenchless rehabilitation, a liner is used to line pipes. Liners are used in tunnel construction, pipe and conduit rehabilitation and pipeline reconstruction. They can be made of concrete, metal or other materials and can be inserted into existing pipe during construction and when repairs are made. One type of installation – live insertion – doesn’t require the pipeline to be taken out of service.
Trenchlesspedia Explains Liner
Liners come in at least five configurations to meet piping and conduit construction and rehabilitation needs. These forms include:
- Segmental concrete tunnel liners and tunnel liner plate, which has the same function as a concrete tunnel liner, but is constructed from metal plates.
- Spiral liners, which are used to repair defective pipelines. The ribbed strips are wound around the spindle of a winding machine in a spiral to reduce their diameter before insertion into a pipe, and unwound once they are in the pipe.
- Modified sliplining
- Fold and form lining