Reinstatement of lateral branch connections in relined sewers or pipes

摘要

PCT No. PCT/AU87/00081 Sec. 371 Date Sep. 30, 1988 Sec. 102(e) Date Sep. 30, 1988 PCT Filed Mar. 25, 1987 PCT Pub. No. WO87/05984 PCT Pub. Date Oct. 8, 1987.A method for reinstating branch lines to main sewers or pipes which have been relined is used in which inflatable plug seals the branch line and grout is injected via an injection pipe to fill the cavity at the junction around the liner. When the grout has initially set the inflatable plug is withdrawn and a pilot hole is cut through the grout and liner by a cutting tool fed down the branch line on a flexible drive. A reaming tool, attached to the flexible drive is drawn from within the liner towards the branch line to open up the pilot hole to fully open the connection between the main sewer or pipe and the branch line.