| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To smoothly deliver crushed pieces of an existing pipe to an arrival pit side without needing to crush the crushed pieces into finer pieces and moreover without clogging the existing pipe in delivering the crushed pieces of the crushed existing pipe to the arrival pit side through the remaining existing pipe. <P>SOLUTION: A cutter head 20 capable of crushing the existing pipe 50 is mounted to the tip of a leading pipe 22. The leading pipe 22 is provided with a main screw 18 for delivering sediment to a start pit, and a flexible screw 32 is connected to the cutter head 20 to serve as an auxiliary screw for delivering the crushed pieces of the existing pipe 50 using the remaining existing pipe 50 as a delivery path. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
