| 摘要 |
PURPOSE:To repair a small caliper piping having a small hole by easily closing said small hole by a high viscosity repairing agent, by filling the space between the front pig and rear pig provided to a wire with the high viscosity repairing agent and pulling said wire through the small caliper piping having the small hole in this state. CONSTITUTION:Compressed air is sent in a small caliper piping 6 from the rear of a wire stretching line having an umbrella-shaped pig at the leading end thereof to insert the line in the small caliper piping 6 from this side toward the leading end of said piping. A wire 5 is connected to said line to be inserted in the small caliper piping 6, and a front pig 7 and a rear pig 8 are connected to the inserted wire 5 at a predetermined interval so as not to fix the front pig 7. Thereafter, the wire 5 is pulled in the small caliper piping 6 in such a state that the space between both pigs 7, 8 is filled with a high viscosity repairing agent 9. At this time, since the front pig 7 is not fixed to the wire 5, the pigs 7, 8 move in the piping 6 in such a state that pressure is applied to the repairing agent 9 by the friction force between the front pig 7 and the wall of the piping, and the repairing agent 9 is blown out from the small hole 6a of the piping 6 when passes the place where the small hole 6a is present to close the small hole 6a.
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