| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling unit capable of discharging excavated soil stored in a tank satisfactorily.SOLUTION: A drilling unit 1 comprises a rotary member 6 having an inclined part 62 which is rotated by a second drive part 7 and can remove excavated soil S attached to the inner face of a taper part 3a in a tank 3. As a result, when an auger screw 4 is reversely rotated by a first drive part 5 so as to backfill the excavated soil S temporarily stored in the tank 3, clogging of the taper part 3a by the excavated soil S is prevented by rotating the rotary member 6 so that the excavated soil S in the tank 3 can be discharged satisfactorily.SELECTED DRAWING: Figure 2 |
