| 摘要 |
PCT No. PCT/FI89/00067 Sec. 371 Date Oct. 19, 1980 Sec. 102(e) Date Oct. 19, 1980 PCT Filed Apr. 11, 1989 PCT Pub. No. WO89/10467 PCT Pub. Date Nov. 2, 1989.A method and apparatus for producing an underground pipeline from an excavated hole uses a drill head with a suitable tool attached thereto. Loosened soil is transported out of the drilled tunnel with a transportation drum containing an internal spiral. The drum is supported by a roll devices fixed to outer pipes. Rotating movement is transmitted to the rotating drill head from the transportation drum which is driven by a motor. Cylinders push the whole system and force is transmitted by the outer pipes to the drill head. Guiding of the drill head is accomplished with fluid actuators. Attachment and removal of the drill tool is accomplished through a free hole in the transportation drum and a central hole in the drill head, and the free hole and central hole also allow observation of the drill tool and tunnel face during drilling. |
