| 摘要 |
PURPOSE:To prevent the occurrence of noise and vibration during the driving work of pile by a method in which PC pile is driven into the ground while turning an excavating blade by a rotary shaft provided inside the hollow of the PC pile, and after the driving work, the rotary shaft is pulled up by leaving behind the tip portion of the rotary shaft under the ground. CONSTITUTION:A PC pile 1 is supported by a pile-driving tower, and a pressure is applied toward the ground by means of jack, etc., from the upper end 10 of the pile 1. A rotary shaft 3 provided inside the hollow 2 of the PC pile lis turned in the direction of arrow 11 by means of a motor, etc., whereby the rotary tip 4 of the shaft 3 is turned, an excavation blade 8 excavates the ground, and the pile 1 is driven into the ground. After the driving of the pile to a given depth, the rotary shaft 3 is pulled up to complete the driving work. In this case, the rotary tip 4 is left behind under the ground to fortify the bearing force of the ground. |
