| 摘要 |
Underground piping (21) is removed by inserting a wire rope (27) therethrough with or without a spinning action, bonding the piping and inserted wire rope together to form an integrated assembly by inserting a settable bonding medium (49) in the annular gap (37) therebetween, and extracting the integrated assembly by pulling and/or pushing same out of the earth strata. The extracted piping can be replaced by fresh piping by coupling the latter to the trailing end of the integrated assembly. The preferred application is the replacement of underground lead or galvanised piping by plastic piping. |
