GROUND IMPROVEMENT METHOD BY HIGH PRESSURE INJECTION AND AGITATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a high pressure injection and agitation ground improvement method capable of establishing a largely scaled ground solidification improvement body in various shapes adapted to a job site, and sharply modifying/improving a construction term/construction costs.SOLUTION: In a high pressure injection and agitation ground improvement method for inserting a pipe rod 2 up to predetermined depth in the ground, and for injecting curing agent from the pipe rod 2 at a high speed under a high pressure, and for carrying out ground cutting and agitation/mixture, the pipe rod 2 is inserted into the ground, and the curing agent is injected in a predetermined time at a high speed under a high pressure by the pipe rod 2 in a rotation-stop state without rotating the pipe rod 2, and the pipe rod 2 is rotated at a predetermined angle within a range of 4 to 15 degrees after injection, and the rotation is stopped, and the curing agent is injected in a predetermined time at a high speed under a high pressure by the pipe rod 2 in a rotation-stop state without rotating the pipe rod 2 again. This process is repeatedly executed so that it is possible to establish a largely-scaled ground solidification improvement body T in a desired shape in the ground.