REINSTATEMENT OF LATERAL BRANCH CONNECTIONS IN RELINED SEWERS OR PIPES

摘要

A method for reinstating branch lines (11) to main sewers or pipes (10) which have been relined. An inflatable plug (13) seals the branch line (11) and grout (15) is injected via an injection pipe (14) to fill the cavity at the junction around the liner (12). When the grout has initially set, the inflatible plug (13) is withdrawn and a pilot hole is cut through the grout (15) and liner (12) by a cutting tool fed down the branch line (11) on a flexible drive. A reaming tool, attached to the flexible drive, is drawn from within the liner (12) towards the branch line (11) to open up the pilot hole to fully open the connection between the main sewer or pipe (10) and the branch line (11).