| 摘要 |
PROBLEM TO BE SOLVED: To provide a soil improvement method excellent in compatibility with an environment and capable of effectively consolidating the circumference of an excavated hole. SOLUTION: The excavated hole 11 with a specific depth is formed while forwarding an earth auger 5. An then, the earth auger 5 is reversed at a low speed and, at the same time, axial force in the direction of excavation is added, and horizontal force is added to aggregate 12 cast from the ground surface 3 by the earth auger 5 to consolidate the circumference of the excavated hole 11 and the inside of the excavated hole. Soil around the excavated hole 11 is effectively compacted to make it possible to carry out soil improvement by reversing the earth auger 5 at a low speed in a state to add axial force to the direction of excavation.
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