SEWER RELINING TECHNIQUES.

There can be no doubting the scale of the crisis facing Britain's aging and crumbling sewer system. The leading UK sewer renovation techniques can be categorized into: stabilization techniques, including pointing and grouting; lining techniques, including pipe and segment systems; and in situ coating techniques, which may be hand or remotely applied. Sewer lining techniques consist of the insertion of pipes or segments into an existing sewer to provide improvements in structural and hydraulic capacity and chemical resistance. The annulus between the lining and the existing sewer structure is generally grouted to ensure satisfactory performance, and secondary grouting of voids in the surrounding soil is frequently undertaken when the new composite structure is able to bear the added loads.