| 摘要 |
PURPOSE:To reduce noise and vibration in driving a custom-made pile by a method in which the ground is loosened by an injection rod, a custom-made pile is penetrated to the vicinity of the bearing stratum by lightly striking it by a low-noise striker and then further into the bearing stratum. CONSTITUTION:Injection rods 2 are penetrated while being connected additionally by means of a machine 1 until they reach right before the bearing stratum 10. The injection rods 2 are then pulled while being turned and while injecting water or cement milk at a high pressure. The pile is vertically erected by a pile-driving tower and a noiseless hammer 8 and finally penetrated into the bearing stratum 10. Since the hard ground alone, requiring a loosening work, is loosened and also the ground requiring no loosening work is left untreated, the construction work can be speeded up, and the hardness of the ground till the bearing stratum can be made almost uniform. Sufficient frictional forces on the periphery of the pile can thus be obtained. |
