| 摘要 |
PURPOSE:To quickly and easily penetrate a hollow tube into the ground by a method in which a vibrator is attached to the top of the hollow tube and a sand discharge and tamping part is provided to the lower part of the hollow tube. CONSTITUTION:A hollow tube 1 hung down from a wire 5 is penetrated to a given depth into the ground where it is to be constructed, and the tube 1 is continuously raised while forcibly discharging and tamping sand, etc., supplied into the hollow tube 1 from a hopper 2 by means a sand discharge and tamping part 8 driven by a piston cylinder device 7. A valve plate 9 provided at the lower end of the hollow tube 1 serves to close the lower end opening of the tube 1 during the penetration period and turns downwards during the rising period of the tube 1. During the penetration period of the tube 1, by operating both a vibrator 4 and the sand discharge and tamping part 8, the hollow tube 1 can be quickly penetrated into the ground because the vibrating effects of the vibrator 4 and the piston cylinder device 7 act on the tube 1. |
