CONSTRUCTION METHOD OF SCREW PILE

PROBLEM TO BE SOLVED: To provide a construction method of a screw pile for improving efficiency of screwing-in intrusion, reducing rotation torque greatly, and obtaining large tip supporting force and to provide the screw pile used in this method. SOLUTION: In this construction method for giving rotation force to a pile body 1 by a pile driving machine 30 by utilizing wood screw action of a blade 10 fixed substantially to a tip part of the hollow pile body 1 and ground digging action of an auger 20 and giving rotation force to a head part of the auger 20 to penetrate a pile into the ground by rotating it, a motor for rotating the pile and a motor for rotating the auger can rotate in the opposite directions to each other. When a tip part of the pile body 1 reaches a part close to a supporting layer, the auger 20 is inserted into the pile body 1 to give rotation force to the auger 20. A hardening fluid material is injected into the supporting layer from an auger head 22 while the pile body 1 rotates to stir and mix sediment and the hardening fluid material up to a predetermined depth, and then the pile body 1 is left and the auger 20 is pulled out to solidify sediment softened in accordance with elapse of time. COPYRIGHT: (C)2006,JPO&NCIPI