| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently remove an area of crushing of an existing pipe. SOLUTION: This existing-pipe crushing device is used to crush the existing hard pipe A having a newly provided pipe B inserted therein, A plurality of tooth parts 4 are longitudinally installed for radially squeezing the area of crushing of the existing pipe defined by previously cutting it crosswise at both longitudinal end positions. The tooth parts 4 are thrusted upon a pipe wall of the existing pipe so as not to cut in deeper than the thickness thereof, thus crushing the existing pipe.</p> |
