| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make it possible to efficiently exchange existing pipes for a renewal pipe in a relatively short time by only facilities in the departing draft side even in the case that the existing embedded pipes are reinforced concrete pipes or thick concrete pipes. <P>SOLUTION: A renewal pipe is fed ahead of a cutting head in the existing embedded pipe to the central part of a cutting head into the front end of an auger shaft and a cutter expanding/contracting to the outer peripheral direction by a hydraulic cylinder is jointed, and hydraulic pressure, water, etc. is fed via the auger shaft from a multiple swivel device of a propulsion machine to the extensible/contractible cutter to eject or press these material from a specified part. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
