| 摘要 |
PROBLEM TO BE SOLVED: To provide a soil improvement construction method by horizontal high-pressure injection stirring which suppresses hole bending occurring at drilling to a minimum level to maintain the precision of the straightness of an improved material, improves work efficiency, reduces a risk of a trouble involved in handing over of work, and cuts down cost. SOLUTION: In the soil improvement construction method by high-pressure injection stirring, a land-making pipe 1 is inserted almost horizontally in the ground G, and in this state high-pressure grout is injected or the grout is injected with a jet of high-pressure water or with a jet of compressed air via the land-making pipe 1 to stir and mix the grout to make an improved material centering around the land-making pipe 1. After a preceding improved material obtains prescribed compression strength, a new improved material is formed on the underground unimproved side in contact with the deepest part of the preceding improved material. This process is repeated in sequence to form a series of separated pieces of improved materials each having a prescribed length to form an improved material composed of the separated pieces of improved materials as a whole. COPYRIGHT: (C)2008,JPO&INPIT
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