To prevent floating of an underground structure by arranging a drain well in the part surrounded by inside/outside impermeable walls of self-standing type double impermeable walls and lattice-like beams, and constructing the underground structure by excavating th ground stranded by a water impermeable bottom plate and the inside inpermeable wall.
Self-standing type double impermeable walls 2 using the bottom part as a drain layer 3 are constructed by connecting an inside impermeable wall 2a and an outside impermeable wall 2b arranged on a water impermeable bottom plate 1 in a radial shape by lattice-like beams 2c. Next, an underground structure B is constructed by excavating the ground A' surrounded by the water impermeable bottom plate 1 and the inside impermeable wall 2a after sufficiently lowering underground water level in an execution work area by operating a pumping well. In this case, since the self-standing type double impermeable walls 2 are high in rigidity by being constituted of the impermeable walls 2a, 2b and the lattice-like beams 2c, the underground structure B can be constructed at an interval from the inside impermeable wall 2a to use the interval 6 as a dry area. Therefore, impermeable performance can be excellently secured over a long period at earthquake time to prevent floating of the underground structure by water pressure and buoyancy of underground water after execution work.
HATANAKA MUNENORI
SHIMIZU TAKAAKI
TAYA YUJI
NANBA HIDEO
ODAKAWA MASAAKI
MORISHIMA AKIRA
TAKENAKA DOBOKU
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