DRIVING OF PILE BY PRESSURE GAS BUFFER

摘要

PURPOSE:To maintain a fixed striking force below the strength of a pile by striking the pile by a cylinder filled with a high-pressure gas whose pressure is selected according to the strength of the pile and the properties of the ground as a buffer. CONSTITUTION:A cylinder 3 filled with a high-pressure gas 6 whose pressure is adjusted to an extent that the striking force becomes less than the strength of the pile is set as a buffer BU between the head helmet 7 of the pile 1 and the tip anvil 8 of a Dieasel hammer DPH. The inside of the cylinder 3 is divided into a high-pressure gas-filled section GES and oil-filled sections 10 and 11 each of which is divided into two compartments by a partition wall 12 and between which is provided with a check valve 13 and throttled portions 14 and 16. By regulating loss energy by adjusting the throttled portions 14 and 16, the application of overimpaction to the stopper 4 of a piston 5 can be prevented.