| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently eliminate soil or the like sticking to a screw. Ž<P>SOLUTION: A rail 1 provided at a leader L is provided with a lift G including a rotating drive mechanism, and the lift is provided with an excavating screw S linked with the rotating drive mechanism. The rail 1 of the leader L below the lift G includes an eliminating mechanism E provided with an eliminating plate 7 turned along the surface of the screw S. After the screw S is rotated and pushed into the ground, the screw S is pulled up from the ground while being rotated in the same direction as the pushed-in time, and when the screw S is pulled up, the eliminating plate 7 is turned in the same direction as the screw S and at a higher speed than the screw S to eliminate soil or the like sticking to the screw S. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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