| 摘要 |
PURPOSE:To prevent the occurrence of noises and vibrations as well as to greatly shorten the period of construction by a method in which a non-circular pile with a vibration-preventing ring and also having an excavator and a fluid jetting device on its tip is directly driven into the ground by a driver. CONSTITUTION:Plural vibration-preventing rings 11 are attached to the periphery of a non-circular foundation pile 1 made of H-steel, etc., in which two excavating blades 13 are welded to the lower end flange cut into an acute angle. A bit is projectionally provided to the downside of the lowest ring 11. A hose through which bentonite liquid 4, etc., is supplied over the whole length of the pipe 1 is also provided. The head of the pile 1 is grasped by the chuck 51 of an auger 5, the pile 1 is turned, and at the same time while bentonite liquid 4 is charged, excavation is made by the excavating blade 13 and the bit. While regulating sideward vibration by the ring 11 and also preventing the degradation of the ground by bentonite liquid 4, the foundation pile 1 is vertically erected.
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