| 摘要 |
PURPOSE:To reduce the weight of a ground improver by eliminating the needs to make the strength above an intermediate supporter higher by providing the intermediate supporter receiving the penetrating and drawing reactions of a rotary shaft having a stirring blade on its lower end in the middle of a leader. CONSTITUTION:An intermediate supporter is fixed to the leader 2 of a ground improver, and an elevator 8 having sheaves 9 and 10 on its upper and lower parts. The middle of a rotary shaft 5 is supported on the elevator 8 by means of a turnable chuck 19, and a rope 15 is wound up while turning the shaft 5 by a rotor 22 and a rope 14 is sent out. The stirring blade 25 is then penetrated into the soft ground 11 while being turned to improve the ground. Since the intermediate supporter receiving the penetrating and drawing reactions of the shaft 5 is provided on the middle of the leader 2, the needs to make the strength of the upper leader 2 higher can be eliminated and therefore, the weight of the leader 2 can be reduced. |
