| 摘要 |
PCT No. PCT/JP80/00075 Sec. 371 Date Oct. 1, 1981 Sec. 102(e) Date Oct. 1, 1981 PCT Filed Apr. 15, 1980 PCT Pub. No. WO81/02317 PCT Pub. Date Aug. 20, 1981.This invention relates to a method for efficiently installing lines, pipes or cables underground. In operation, a boring head which forms an elongated bore underground along with the movement of a boring device is disposed underground. A flat plastic sheet is continuously reeled out and is formed into a rigid plastic tube. A hauling rope is simultaneously reeled out into the rigid plastic tube, such plastic tube and hauling rope have their front extremities connected to the rear end of the boring head. The plastic tube is continuously installed underground along with the movement of the boring head. The movement of the boring head also provides simultaneous extending of the hauling rope in and along a installed plastic tube. The front portion of the line, pipe or cable is connected to the tail portion of the extended hauling rope. Finally, only the hauling rope is pulled or hauled within and along the plastic tube so as to install the line, pipe or cable in and along the plastic tube.
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