Flexible pipe in flexible pipe construction method and flexible pipe in flexible pipe construction method execution device

摘要

PROBLEM TO BE SOLVED: To provide a pipe-in-pipe method capable of shortening a cut off time of water flow as short as possible.;SOLUTION: After preparation process, an installation process of new pipes, an insertion process of new pipes, a discharging process of water, and a returning process are repeatedly executed; and in every repeating discharge process, water accumulated in the upstream side of an interruption hole 2 is discharged downstream through the new pipes 20.;COPYRIGHT: (C)2004,JPO