| 摘要 |
PROBLEM TO BE SOLVED: To safely, quickly and surely excavate the periphery of a columnar structure with a small earth removal quantity, by highly efficiently and surely sheathing earth, even in a narrow work place. SOLUTION: This hydraulic press-in type temporary sheathing method is composed of a process of successively discharging a mixture of sediment and water in a sheathing material 10 to an external part by a vacuum device by pushing the sheathing material 10 in the ground while injecting high pressure water between the columnar structure 6 and the sheathing material 10 by a plurality of hydraulic cylinders 8 interposed between the sheathing material 10 and a reaction receiving frame body 7 by assembling and forming the cylindrical steel plate sheathing material 10 having the predetermined length in a concentric shape with the columnar structure 6, a process of filling an inside space with the sediment, and a process of extracting and removing the sheathing material 10 from the inside of the ground by pushing up an extraction stand by the plurality of hydraulic cylinders interposed between the extraction stand and the ground via a plurality of extraction rod bodies by assembling and forming the extraction stand in an outer peripheral part of the columnar structure 6. COPYRIGHT: (C)2007,JPO&INPIT
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