UNDERGROUND STRUCTURE CONSTRUCTION METHOD, UNDERGROUND STRUCTURE, AND PRECAST CONCRETE SIDE WALL OR INTERMEDIATE WALL/POLE FOR USE IN THE SAME

摘要

PPROBLEM TO BE SOLVED: To provide an underground structure construction method according to which a ground occupation area necessary for construction work is minimized and a construction period is shortened, to thereby suppress an influence on the environmental circumstance to the minimum, and an occupation width taken up during the construction work is reduced, and energy saving etc. in the construction work are achieved. PSOLUTION: The underground structure construction method is comprised of following three steps. In the first step, precast concrete side walls 2, 2 forming a main body structure are built in the ground at locations where both side wall portions are to be erected, and a shallow ground portion between the precast concrete side walls 2, 2 is excavated and removed. Thereafter a precast concrete top slab 4 forming the main body structure is extended between the precast concrete side walls 2, 2, and then the excavated portion is back-filled, to thereby antecedently complete the shallow portion above the top slab. In the second step, excavation is carried out in a ground portion enclosed by the precast concrete side walls 2, 2 and the precast concrete top slab 4, which is deeper than the top slab, and finally excavation is carried out in a ground portion down to a depth at which a bottom slab 5 is constructed. In the third step, concrete is placed in a bottom slab construction area, and unitary combination of the bottom slab with the precast concrete side walls 2 is achieved. PCOPYRIGHT: (C)2006,JPO&NCIPI