PROBLEM TO BE SOLVED: To suppress the deflection of wall panels in an underground double wall structure in which upper and lower ends of the wall panels are fixed to form double walls.;SOLUTION: The present invention comprises a plurality of wall panels 20 consisting of metal sandwich panels erected inside an underground outer wall 11, and a pressure receiving block 70 which is fixed to one of the facing surfaces of the outer wall 11 and the wall panel 20 and not fixed to the other, and has a non-contact surface with a gap 16 between the pressure receiving block and the other of the facing surfaces. Deflection of the wall panel 20 is suppressed by the pressure receiving block 70, and unevenness of the outer wall 11 is absorbed by the gap 16.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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