| 摘要 |
PURPOSE:To cause bearing forces corresponding to the whole area of a pile to act on the pile body by a method in which the ground is excavated by the tip metal of a center shaft piercing through the hollow of the pile, while the pile is lowered to the supporting layer, and the floor plate of the tip metal is contacted with the lower end of the pile. CONSTITUTION:The tip hollow of a center shaft 7 is fitted on a passive metal 5 on a floor plate 1 provided at the downside of an excavating blade 4. When the center shaft 7 is turned, the excavating blade 4 is turned through a projection 8 provided on the inner wall of the hollow of the center shaft 7 and the coupling groove 9 of the passive metal 5 and the ground is excavated. The excavated soil and sand are discharged by a screw lift 10, and the pile P is lowered as the excavation proceeds. When the pile P reaches the supporting layer, the center shaft 7 is pulled up, the pile P is lowered, and the end plate 12 of the pile P is contacted with the cylinder 2 of the tip metal M. The bearing force of the ground corresponding to the whole area including the hollow of the pile comes to act on the pile body. |
