HOLLOW PIPE FOR CONSTRUCTING DISPLACEMENT REDUCTION TYPE COMPACTED SAND PILE AND CONSTRUCTION METHOD OF COMPACTED SAND PILE

摘要

PROBLEM TO BE SOLVED: To provide a hollow pipe for constructing a compacted sand pile and a construction method of a compacted sand pile with high construction efficiency, which solve displacement problems that adversely affect existing structures.;SOLUTION: A step of jetting jet water from the injection port 13 while rotating a hollow pipe 1 which have an inclined blade 12 on an outer peripheral surface of the hollow pipe main body 11 and an injection port 13 for jet water jetting around the hollow pipe at a tip end portion of the hollow pipe main body 11, and penetrating the hollow pipe to a predetermined depth with loosing around the hollow pipe is performed. A step of discharging a sand pile material 19 in the hollow pipe 1 with an appropriate length drawn out from the hollow pipe and a step of driving-back the hollow pipe 1 are sequentially repeated until reaching the surface of the earth, and a compacted sand pile 42 is formed in the soft ground.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2018,JPO&INPIT