| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method for an underground structure by a PCa pile underground wall to construct the underground structure at less cost in a short period of time by less site work and safely without disturbing a ground in the circumference. SOLUTION: PCa pile underground walls 1 are arranged opposed to each other or in a ring by driving a large number of precast concrete piles underground by arranging them in a row. Thereby, a top plating 2 is constructed with cast-in-place concrete integrally with an upper end of the underground wall in a state of primarily drilling between the underground walls 1, 1 to depth where a top part of the underground wall 1 is exposed, and a bottom plating 3 is constructed with cast-in-place concrete after drilling and forming an underground space between the underground walls 1, 1 by primary drilling.
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