| 摘要 |
PURPOSE:To efficiently excavate the ground even by small-sized penetrator by a method in which while a jet nozzle on the tip of a pile is lowered separately from the pile, a high-pressure liquid is jetted and the pile is penetrated mechanically on a repeating basis. CONSTITUTION:Plural guide plats 4 are erectly provided to a pile head bolt device 2 on the upper end of a pile 1 to guide a pipe 6 leading to a jet nozzle 5. The pipe 6 is vertically moved in relation to the pile while regulating its moving amount by a guide groove 8 and a guide stopper 9. When a high-pressure liquid is jetted toward underground G from the jet nozzle 5, the nozzle 5 is settled under the weight 7, and the pile 1 is penetrated by a jack 11 and driven to a given depth by the operation of the jack 11. Since the pile 1 is penetrated into the ground intermittently by the expanding and contracting action for the cylinder of a piston, the pile 1 can be driven to a desired depth even by a small- sized penetrator by repeating said operations. |
