| 摘要 |
PURPOSE:To control the amount of soil discharged while lessening noise and vibration by a method in which a cylinder having concentrical form related to a pile cylinder is connected to the tip of the pile cylinder through an annular space and the outside diameter of an earth auger is made smaller than the inside diameter of the pile cylinder. CONSTITUTION:A cylinder 2 having a concentrical form related to an underground pile cylinder 1 is connected to the tip of the cylinder 1 in such a way as to form an annular space between both the cylinders 1 and 2, and a part 3 to close the tip of the cylinder 1 is connectedly provided inside the cylinder 1. The outside diameter of an earth auger 5 is made smaller than the inside diameter of the cylinder 1 such that soil is left behind on the inner surface of the cylinder 1, and the tip side of the auger 5 is thrust through the cylinder 2. The cylinder 1 and the auger 5 are both penetrated into the ground while being turned, and after the tip of the cylinder 1 reaches a supporting layer A, the auger 5 is pulled up and the cylinder 1 is driven to a given depth. |
