| 摘要 |
The front end of the outer pipe 21 of the nested pipes 2 is sealed off, an auxiliary pipe 3 is joined so as to be detachable onto the tail end of the outer pipe 21, and a thrusting device 4 is mounted onto the auxiliary pipe 3. The nested pipes 2 are filled with a filler fluid 28, then as the thrusting device 4 generates pressure on the filler fluid 28, the nested pipes 2 are inserted into the existing pipe 1.
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