ROOF OF UNDERGROUND STRUCTURE AND METHOD FOR CONSTRUCTING THE SAME

摘要

PURPOSE: A roof of an underground structure and a construction method thereof are provided to achieve high load resistance and long span without increase in the diameter of slab pipes. CONSTITUTION: A construction method of a roof of an underground structure is as follows. Upper gallery pipes are successively inserted in the longitudinal direction of an underground structure from right and left sides of a designated underground structure location, and the soil in the upper gallery pipes is eliminated. A plurality of slab pipes(120) are inserted continuously one of the upper gallery pipes to another, and the soil in the slab pipes is eliminated. Inner pipes for reinforcement(140), having a smaller diameter than the slab pipes and a plurality of inner shear connectors(142) on the inner periphery, are lead into the slab pipes. Sheaths(160) are installed inside the inner pipes for reinforcement. Tendons(170) are inserted into the sheaths. Reinforcing bars are arranged and concrete is filled in the inner pipes for reinforcement in order to integrate the inner shear connectors and concrete. After the curing of concrete, the tendons are tensed and anchored.