| 摘要 |
PURPOSE:To decrease an amount of gravel in excavated soil and to prevent breakage of a hollow pile, by a method wherein gravel in an excavated soil is coated on the inner wall surface of the excavated hole while a ground is excavated, and simultaneously, the hollow pile is gradually sunk in the excavated hole. CONSTITUTION:A hollow pile 3 is vertically supported by a strut 2, a rotary shaft 4, interposed through the hollow pile 3, is rotated, a ground is excavated by the use of a cutter 6, and the hollow pile 3 is gradually sunk. Simultaneously, a body 7 is rotated, and thereby a part of excavated soil is coated on an inner wall surface 8-1 of an excavated hole 8 by means of a trowel body 7, and this decreases an amount of excavated soil discharged. Further, gravel in the excavated soil is coated on the inner wall surface 8-1, and this prevents cutting through of gravel between a screw blade 11 and the inner wall surface of the hollow pile 3, resulting in prevention of breakage of the hollow pile 3. |
