CAST-IN-PLACE CONCRETE-FILLED STEEL PIPE PILE, CONSTRUCTION METHOD FOR CAST-IN-PLACE CONCRETE-FILLED STEEL PIPE PILE AND FOUNDATION STRUCTURE OF STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a cast-in-place concrete-filled steel pipe pile for safely supporting a building load even under large deformation, a construction method for the cast-in-place concrete-filled steel pipe pile, and a foundation structure of a structure.;SOLUTION: This cast-in-place concrete-filled steel pipe pile 7 is constructed in the ground having a liquefied layer 4, and is composed of an upper pile part 8 positioned in the liquefied layer 4, and a lower pile part 10 positioned in a lower layer of the liquefied layer 4. The upper pile part 8 is composed of a small diameter steel pipe 9 having an outer diameter smaller than a cross-sectional diameter of a vertical hole 5, and concrete 12 filled inside. The lower pile part 10 is composed of a cage reinforcement 11, and the concrete 12 for filling this reinforcement. The cage reinforcement 11 has a main reinforcement 11a having the length reaching the surface vicinity of an unliquefied layer 3 from a support layer. The upper end part vicinity of the main reinforcement 11a is fixed to the lower end part vicinity of the steel pipe 9, and the substantially whole of the upper pile part 8 is positioned in the liquefied layer 4.;COPYRIGHT: (C)2004,JPO&NCIPI