SOIL IMPROVEMENT METHOD

摘要

PROBLEM TO BE SOLVED: To prevent an adverse effect on a ground by hardener injection in the case of the land formation of a soil improving pile. SOLUTION: A preceding drilling 5 is formed by using a drilling machine first to a ground to be improved while the soil removal of a ground-volume increase corresponding section by hardener injection executed at a post-stage is conducted precedently, and a rod 7 having an agitating blade 8 and a hardener injection hole at a front end section is penetrated into the preceding drilling by using a high-pressure injection agitator 6 with the rod and a hardener is injected around the preceding drilling from the hardener injection hole, thus land-forming the ground improving pile 2 having a diameter larger than the preceding drilling centering around the preceding drilling. The diameter of the preceding drilling is equalized to that of the agitating blade in the high- pressure injection agitator. The method is applied when new ground improving piles burying voids among these ground improving piles are land-formed among the mutual piles.