The auger head and the auger axis the auger device and

摘要

PROBLEM TO BE SOLVED: To inexpensively improve soil by reducing vibration and noise in work.;SOLUTION: This ground improvement construction method uses a cylindrical auger case 3 for excavating the ground by rotating in the predetermined direction, and an auger 5 installed in the auger case 3 for freely normally rotatable and reversely rotatable; and fills up an excavation hole by successively pressing and hardening improved earth, while pressing the improved earth in the auger case 3 to a peripheral surface in the horizontal direction of the excavation hole by a pressing surface of an auger head 6 arranged under the auger 5, by making lifting motion while reversely rotating the auger 5, by excavating the earth in the auger case 3 by drilling a hole by the auger case 3, by normally rotating the auger 5.;COPYRIGHT: (C)2006,JPO&NCIPI