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1. (WO2018203489) METHOD FOR FORMING CONCRETE STRUCTURE IN GROUND

Pub. No.:    WO/2018/203489    International Application No.:    PCT/JP2018/016438
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Tue Apr 24 01:59:59 CEST 2018
IPC: E02D 3/12
E02D 5/46
Applicants: SST ASSOCIATION INC.
株式会社エスエスティー協会
Inventors: IIDA Tetsuo
飯田 哲夫
Title: METHOD FOR FORMING CONCRETE STRUCTURE IN GROUND
Abstract:
This method for forming a concrete structure in the ground comprises placing a mixed material into a hole 220 formed in the ground, and compacting the mixed material against peripheral soil in the hole 220 by reversely rotating a soil improvement auger. A first blade has a pressing lower surface for compacting the mixed material against the peripheral soil in a prescribed direction during reverse rotation of the auger shaft, and a first lateral pressing surface for compacting the mixed material against the peripheral soil in a direction orthogonal to the prescribed direction during reverse rotation of the auger shaft. A second blade has a second lateral pressing surface for compacting the mixed material against the peripheral soil in a direction orthogonal to the prescribed direction during reverse rotation of the auger shaft.