| 摘要 |
<p>PURPOSE:To provide a pipe pulling-off method and a pipe renewing method wherein a worn-out and deteriorated existing pipe can be completely removed without breakage and a new main pipe is smoothly installed, in a piping line where a main pipe is inserted through a disposed protecting pipe. CONSTITUTION:In a pipe line where a main pipe 1 is inserted through a disposed protection pipe, a traction wire 3 is inserted in the main pipe 1 and one end of the wire 3 is bound to one end of the main pipe 1. Thereafter, by conducting traction of the other end side of the traction wire 3, the main pipe 1 is pulled off from the disposed protection pipe 2. By intercoupling the one end of the wire 3 and the tip of a new pipe, the main pipe 1 is pulled off and the new main pipe 1 is inserted in the disposed protection pipe 2.</p> |
