| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for efficiently removing steel pipes embedded under water while minimizing problems in water traffic, and to provide a cutting device. <P>SOLUTION: The cutting device 1 having a cutting module 2 and a moving module 11 connected to each other is inserted into a concrete lining steel pipe 20 for cutting work using a rotary cutter 3 of the cutting module 2 to cut a steel pipe 21 from its inside all over its peripheral wall in the peripheral direction in the state of leaving a concrete lining 22 while using the moving module 11 to move the cutting module 2 to positions at predetermined-length spaces in a pipe longitudinal direction, in sequence. A portion of the concrete lining steel pipe 20 equivalent to the portion of the steel pipe 21 decoupled in a predetermined length through the cutting work is lifted up, and then the concrete lining 22 around the position where the cutting work is done for the lifted portion is broken down, raised above the water as it is, and removed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
