STRUCTURE AND METHOD FOR CONSTRUCTION OF BOX CULVERT

PROBLEM TO BE SOLVED: To eliminate an obstruction to the traveling of a vehicle and labor for the control of a road by dispensing with smoothing by virtue of the elimination of a step between a temporary lining and a peripheral road surface. SOLUTION: The ground inside an earth retaining wall 2, which is created in the ground 1, is excavated to a prescribed depth, and a bracket 31 is mounted near the upper end of the wall 2. A precast concrete slab, constituting an upper slab 30D of a box culvert 30, is installed by being supported on the bracket 31. The precast concrete lab 30D is used as a strut and the temporary lining. The inside ground of the wall 2 on the lower side of the slab 30 is excavated in order to undergo leveling work. The base 30A and side walls 30B and 30C of the box culvert 30 are constructed in an excavated space and coupled to the slab 30D for the purpose of construction the box culvert 30.