CONSTRUCTION METHOD FOR CAST-IN-PLACE PILE

PROBLEM TO BE SOLVED: To certainly inflate a bag at a specified position in a hole and to secure improvement of bearing power as a pile, horizontal bearing force and deforming performance in the case of improving bearing power as the pile, the horizontal bearing force and the deforming performance by inserting the bag in the drilled hole and filling a filler in this bag or in a cavity in the bag or between the bag and the hole. SOLUTION: Consolidation of the foundation of a head end part is carried out by providing a cylindrical bag fixing member 7 on a head end of a bag 2, injecting a filler 18 into a hole 3 through the bag fixing member 7 from an opening 6 of the head end of the bag 2 by a rod 5 to insert into the bag 2 and burying the bag fixing member 7 in the filler 18 in the case of constructing a cylindrical cast-in-place pile covered with the bag 2 by inserting the bag 2 into the drilled hole 3 and inflating the bag 2 by filling the filler 18 such as cement milk, mortar or concrete. Thereafter, the cylindrical cast-in- place pile covered with the bag 2 is constructed by inflating the bag 2 by discharging the filler 18 from the rod 5 into the bag 2.