| 摘要 |
PCT No. PCT/GB92/02407 Sec. 371 Date Sep. 14, 1994 Sec. 102(e) Date Sep. 14, 1994 PCT Filed Dec. 30, 1992 PCT Pub. No. WO93/13351 PCT Pub. Date Jul. 8, 1993.A mole is provided for use in replacing or preparing for replacement an existing underground pipe. The mole is sized to permit insertion into and movement along the existing pipe. The mole is provided with a front portion having a cutting edge for engaging the internal wall of the existing pipe and to fracture the same. The rear portion of the mole clamps to a new pipe or a liner for the existing pipe. Accordingly, The mole is adapted to tow the new pipe or the liner through the fractured pipe. The head portion of the mole is tapered toward the front and has flat or scalloped sides defining therebetween integral cutting edges.
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