| 摘要 |
PROBLEM TO BE SOLVED: To build a large sectional main girder in large width by a precast segment by shop fabrication, and to conduct building works by a normal erection girder or the like in the precast segment construction method of a bridge. SOLUTION: A large sectional main girder such as a viaduct is divided into three in the bridge-axis rectangular direction, and composed of a box-shaped sectional precast core segment 1 and a pair of left-right precast overhanging floor slabs 2, 2, and the overhanging floor slabs 2 are supported by struts 3 comprising a precast concrete member, a steel pipe, a concrete-infilled steel pipe, H-steel or the like. The lower ends of the struts 3 are joined with an external side face in the bottom slab section 1b of the core segment 1 by joining sections 4, the upper ends of the struts 3 are joined with undersides at the front end sections of the overhanging floor slabs 2 by joining sections 5, and the base end sections of the overhanging floor slabs 2 are cemented with the external side face of the floor slab section 1a of the core segment 1 by joining sections 6, thus constituting a main girder segment. |
