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HOLE WALL PROTECTING DEVICE, HOLE EXCAVATING METHOD USING THE HOLE WALL PROTECTING DEVICE, AND HOLE WALL PROTECTING METHOD USING THE HOLE WALL PROTECTING DEVICE
HOLE WALL PROTECTING DEVICE, HOLE EXCAVATING METHOD USING THE HOLE WALL PROTECTING DEVICE, AND HOLE WALL PROTECTING METHOD USING THE HOLE WALL PROTECTING DEVICE
PROBLEM TO BE SOLVED: To provide a hole wall protecting device capable of protecting a hole wall in a reliable manner and easily carried out of a pile hole.;SOLUTION: The hole wall protecting device 1 comprises a round steel pipe 5 having a recessed part 3 at an outer peripheral part and having a diameter slightly smaller than the diameter of a pile hole 13; a cylindrical membrane body 7 which is an expansion part installed to close up the recessed part 3 and expandable/contractible by the pressure of an operating fluid such as air or water; and a feeding means 9 for feeding the operating fluid to the membrane body 7. The membrane body 7 is formed by welding or bonding synthetic fiber with anisotropic expansibility to a rubber membrane, wherein the fiber of the synthetic fiber is arranged in a direction to expand and contract more prominently in a radial direction than in the axial direction of the round steel pipe 5. The membrane body 7 thereby expands and contracts more prominently in the radial direction than in the axial direction.;COPYRIGHT: (C)2007,JPO&INPIT
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