Underground structure and method of rebuilding building with underground building

摘要

PROBLEM TO BE SOLVED: To make a cast-in-place concrete pile larger in diameter and lower in cost, and to facilitate construction when suppressing floating of an existing pressure board and occurrence of a board swelling phenomenon by installing the cast-in-place concrete pile for reconstruction of a building having an underground skeleton.SOLUTION: There is provided an underground structure for reconstruction of a building having an underground skeleton, the underground structure including: an existing pressure board 22 which is not disassembled and left under the ground; a newly-constructed cast-in-place concrete pile 40 constructed to penetrate the existing pressure board 22; a steel pipe 42 buried in a head part of the newly-constructed cast-in-place concrete pile 40 so as to protrude from a through hole of the existing pressure board 22; and a flange part 46 which projects from the steel pipe 42 to an external-diameter side to engage the existing pressure board 22 from above.