The water catchment tube which reduction diameter is made inside the water catchment tube installation construction method null cylindrical outer tube which uses the water catchment tube installation device and

摘要

PPROBLEM TO BE SOLVED: To enable recovery of a crushing head, to efficiently mount a water collecting pipe without being affected by the hardness of the ground, and to prevent an accident of ground subsidence. PSOLUTION: An opening part of a cylindrical drawstring bag is fixed to a front end of a cylindrical outer pipe of a press-fit pipe including the outer pipe, and an inner pipe insertably arranged in the outer pipe in a manner of allowing the water collecting pipe to penetrate. A string for closing the drawstring bag by pulling the opening part of the drawstring bag is arranged outside. The inner pipe is provided with a crushing body which is provided with the crushing head and a rod. The crushing body is freely insertably arranged in the inner pipe by the intermediary of a packing for the crushing head. PCOPYRIGHT: (C)2011,JPO&INPIT