LOT FOR PLIERS, PLIERS, AND LOW STRENGTHENING METHOD FOR PLIER COLUMN AND BURYING METHOD FOR EXISTING PILE BY USE OF THEM

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for low strengthening a plier column formed in a pile hole between a pile head level and a ground surface easily when burying an existing pile by a preboring construction method. SOLUTION: In this construction method, a rotary cap 11 is attached to an upper end of the existing pile 26, the existing pile 26 is buried to a predetermined depth in the pile hole 17 filled with an unhardened hardening filler 24, an auger is reversely rotated after the existing pile 26 is buried to the predetermined depth, and the rotary cap 11 is removed from the existing pile 26 and is pulled up by about 1 meter. A bentonite liquid used as a dilution solution is discharged through a discharge port 5 formed in the lot 1 at a lower end of the pliers 19 and is mixed together with the unhardened hardening filler 24 in an upper part of the pile hole 17 while stirring them by stirring blades 15 to pull up the pliers 19. Since the hardening filler 24 filled into the upper part above the depth for starting discharge and the bentonite liquid are stirred and mixed together, the plier column 23 being a hardening object is low strengthened, and excavation work becomes easier owing to the low strengthening of the plier column 23 than ever. COPYRIGHT: (C)2011,JPO&INPIT