Drainage repair - Relining

With the use of up to date drainage repair methods and technology when it comes to blocked drainage systems today there is no need to make costly excavations causing disruption to property and people in order to effect a permanent structural repair.

Using Soft Lining and Resin Lining Technology as described below, it is possible to achieve a permanent structural drainage repair for example under an office block whilst the occupants continue to work unaffected.

Softlining

To cast insitu a 3 - 10mm thick Fibre Reinforced Plastic Pipe against the wall of the defective buried pipe. The process is carried out in four stages.

Stage 1
A felt tube the same size as the inside diameter of the defective pipe is saturated with a liquid resin.

Stage 2
The saturated tube is inserted into the pipe by the pull through method.

Stage 3
A layflat plastic calibration tube is inflated by the introduction of water or air pushing the saturated tube to its full diameter.

Stage 4
Once the resin has cured the inner calibration tube is removed leaving the existing pipe lined with a hardened polyester liner.

Installation of Cold Cured Resin Linings in Buried Pipes

To cast insitu a plastic structural lining against the walls of an existing pipe. The liner is designed to have a mechanical fit with the existing pipe as opposed to a chemical bond.

Stage 1
Clean the pipe concerned using high pressure water or by mechanical means. Ensure the pipe is free of silt, debris, roots and scale. If these are not removed they shall show up as a bulge under the lining.

Stage 2
Inspect the clenliness of the pipe using a CCTV camera. Check for any blind connections, bends or badly misaligned joints or backfalls.

Stage 3
Pull a 10mm thick polypropelene rope through the drain.

Stage 4
Calculate the amount of resin required for the job. Calculate the connection of accelerator and catalyst using the relevant tables in the next section.