BY-PASS JIG AND BY-PASS CONSTRUCTION METHOD USING THIS JIG

摘要

PROBLEM TO BE SOLVED: To reduce time required for a process of forming a by-pass by providing an opening part that can insert a boring jig and a gas bag insert pipe alternatively in an airtight state in the state of a saddle joint being heat-fused to a synthetic resin pipe. SOLUTION: An opening part is provided to alternatively and airtightly insert a boring jig that can bore a through hole in the pipe wall of a synthetic resin pipe 300 in the state of a saddle joint being heat-fused to the synthetic resin pipe 300, and a gas bag insert pipe 40 that can guide an unexpanded gas bag 62 from the through hole toward the inside of the synthetic resin pipe 30 along the axis of the synthetic resin pipe 300. Boring work to the pipe wall of the synthetic resin pipe 300 is therefore performed only in two places where two saddle joints 100 are heat-fused, which results in reducing time required for the whole construction method of forming a by-pass.