| 摘要 |
<p>PROBLEM TO BE SOLVED: To continuously extract a buried pipe without needing to cut the buried pipe in a drilled ditch by utilizing the drilled ditch provided in one end of the buried pipe as a bent space and pulling out the buried pipe while bending the same upward from its end side. SOLUTION: The wire 6 of a hoisting device 5 is connected to a bracket 13 attached to one end 1a of a buried pipe 1 and the wire 6 is hoist wound. Then, the buried pipe 1 is pulled out into a drilled ditch 3 from one end side 1a and bent upward along a bent surface 9. Since a plurality of rollers 8 are provided in the bent surface 9, friction between the buried pipe 1 and the bent surface 9 is kept small and the buried pipe 1 is extracted while bending it upward even if a power of the hoisting device 5 is reduced. Further, after hoisting is performed by a necessary amount decided by the initial position of the bracket 3, by shifting the bracket 3 to the other end side 1b, the buried pipe 1 is continuously extracted.</p> |
