| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently replace an existing embedded pipe to a new pipe. SOLUTION: An existing embedded pipe A is cut off to make it impervious with a forward partition wall 2 and the concrete of the existing embedded pipe A is cut by a roller bit 7 installed at the rear side of the forward partition wall 2. Then, the broken fragments of the pipe cut by the roller bit 7 and reinforcements are torn off by a high-speed cutter 8 and broken pieces are sent out and disposed through a discharge pipe 13 for muck and new pipes are laid.</p> |
