HOLLOW STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a hollow structure with which the facilities such as a management facility or a common ditch in particular can be easily constructed. SOLUTION: Two right and left units of side walls 1 and 1 and at least one unit of vault 2 arched between the upper end portions of the side walls 1 and 1 are installed in plurality in adjacent to the axial direction of a tunnel 'a', and a side wall body 7 projecting out to an almost reversed L-shaped cross section is provided at the inner side of one of the side walls 1. A recessed portion 8 comprising a side wall body 7 and a lower end portion of a side wall 1 is filled with a sediment or the like and a management road 4 is constructed.