| 摘要 |
<p>PURPOSE:To surely repair a pipe joint portion by providing a repairing resin between a replacing pig and a preceding pig and applying a brake to the preceding pig only at the time of passing through a pipe joint portion to apply pressure to the resin to be nearly a defined pressure. CONSTITUTION:By pulling a replacing pig 2, a preceding pig 3 is pushed via resin C and moved, normally moving in a condition that no braking force is applied to a brake wire 4a. Hence, no large pressure is applied to the resin C and, even if there is a branch pipe or an unidentified pipe midway in an existing pipe 1, it can be prevented that a large quantity of resin C enters such a pipe. When the replacing pig arrives at a pipe joint portion 13 position, braking force is applied to the brake wire 4a, thereby applying pressure to the resin C interposed toward the moving replacing pig 2, and the resin C under pressure flows into the joint space of the pipe joint portion 13.</p> |
