| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that in pulling out a remaining unnecessary pipe put in the buried state, the pipe body is accidentally broken in the midway not to be pulled out. <P>SOLUTION: The terminal end of the remaining unnecessary pipe 2 formed of a flexible pipe such as a lead pipe separated from a conduit 1 is exposed to the inside of a digging pit A and opened. A core wire rod 3 such as a wire and rod having required tensile strength is passed from the opening part through the inside of the pipe 2 to be removed, and then filling material 4 such as resin or mortar having the property of adhesion between the core wire rod 3 and the pipe body is injected into the pipe 2 to integrate the core wire rod 3 with the pipe body. After the filling material 4 is hardened, the terminal end of the unnecessary pipe 2 with which the core wire rod 3 is integrated is chuck to a pulling device 8 to be pulled out while being towed, and then drawn out as it is without cutting to the outside of the work pit A. <P>COPYRIGHT: (C)2004,JPO</p> |
