WIDENING PC FLOOR SLAB STRUCTURE, AND WIDENING METHOD FOR EXISTING PC FLOOR SLAB

摘要

PROBLEM TO BE SOLVED: To provide a widening PC floor slab structure that prevents a floor slab thickness from being increased and an RC structure part from being formed.SOLUTION: A widening PC floor slab structure 1 is for widening in a width direction an existing concrete floor slab part 10A at an existing main girder A that includes the existing concrete floor slab part 10A and a girder 11A for supporting the existing concrete floor slab part 10A. A precast rib 2 is connected to the girder 11A by tensioning a first cable 3, the precast rib projecting partly outward in the width direction than the existing concrete floor slab part 10A and being pierced through inside by the first cable 3 and a second cable 4, the cables being made of PC steel. The precast rib 2 is prestressed, and a PC plate 5 is mounted on a part of the precast rib, for forming an overhang floor slab part 6 by casting concrete in a space formed between the PC plate 5 and an edge of the existing concrete floor slab part 10A in the width direction. Then, tension is applied to the second cable 4 for prestressing a joint part 7 between the existing concrete floor slab part 10A and the overhang floor slab part 6.SELECTED DRAWING: Figure 1