| 摘要 |
PROBLEM TO BE SOLVED: To provide a hardening method of a soft ground capable of surely improving an area necessary to improve the soft ground in the horizontal direction and also improving a downward area of a structure. SOLUTION: A pilot hole (7) is curvedly excavated in the ground (G) by making use of a universal boring machine (3), a diameter of the excavated pilot hole (7) is enlarged by a diameter enlargement bit (16) put on the front end of a sleeve pipe (12) for injecting grout, at the same time, a cement milk (Ms) is jetted into the diameter enlarged hole (8) to harden, and cracking of the hardened cement milk (HMs) is made by the grout (Mg) jetted from a grout jetting pipe (20) inserted into the sleeve pipe (12) to jet it into the ground (G).
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