| 摘要 |
<p>PURPOSE: To prevent a pipe body from being accidentally torn in the middle when a buried remaining unnecessary pipe is pulled out so as to surely extract the pipe body. CONSTITUTION: A terminal end of a remaining unnecessary pipe 2 separated from a conduit line 1 is exposed and opened in the inside of an excavation pit A, and from the opening part, a core wire material 3 such as a wire and a rod provided with necessary tensile strength is passed through into the pipe 2 to be removed, and then, a filler material 4 such as resin and mortar provided with an adhering properly for the core material 3 and a pipe body is filled in the pipe 2 so as to integrate the core material 3 and the pipe body together. After hardening the filler material 4, the terminal end of the unnecessary pipe 2 with which the core material 3 is integrated is chucked by means of an extracting device 8 so as to be towed, and extraction is carried.</p> |
