CONSTRUCTION METHOD OF ENLARGED BOTTOM PART AND DEVICE THEREFOR/IN ENLARGED BOTTOM FOUNDATION CONSTRUCTION METHOD

摘要

PURPOSE: To eliminate a fear of small falling-in in an enlarged bottom excavation part at the time of constructing an enlarged bottom part in an enlarged bottom foundation construction method and make it applicable also to the hard ground. ;CONSTITUTION: An enlarged bottom part constructing device 11 is installed at the bottom part 12b of a foundation hole 12. A pipe 14 is disposed in such a way as to pass the drill 13 of the enlarged bottom part constructing device 11 therein while boring a horizontal hole in the wall surface 12a around the bottom part 12b of the foundation hole 12 by the drill 13. This pipe 14 is force-fitted into this horizontal hole while being pressurized by a hydraulic cylinder 19. After removing sediment in the pipe 14, an anchor member is inserted, then the arrangement of reinforcement is applied around the anchor member, and the end part of the anchor member is fixedly connected to the lower end part of a main column member. Concrete is then cast therein. Because of the hole being bored by the drill 13, the compression of sediment is not generated at the time of force-fitting the pipe 14 into the hole, and the pipe 14 can be force-fitted easily even into the hard ground. In addition, since the pipe 14 functions as reinforcement (support), there is no fear of small falling-in in an enlarged bottom excavation part.;COPYRIGHT: (C)1993,JPO&Japio