| 摘要 |
A tool for replacing existing plastic water service pipes that are buried underground. The proposed tool is pulled through an existing pipe by means of a stranded steel cable. The internal wall of the pipe is scored by a single cutting blade incorporated into the tool. The pipe is split open along the scoring as a result of the outward pressure created by a rearward portion of the conically shaped tool which is larger in diameter than the inside of the existing pipe. A replacement pipe is attached to the end of the tool and simultaneously pulled into place. The short tapered shape of the tool allows it to be pulled through bends encountered in the existing plastic pipe.
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