| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure of a precast floor slab using joint reinforcements having a tip end shape that does not likely to cause a shear fracture in a gap-filling part.SOLUTION: A precast floor slab 1 comprises precast floor slab bodies 2 mounted orthogonal to a main girder, a gap-filling concrete part 4 arranged in a gap between end faces 3 of the respective precast floor slab bodies 2, and upper joint reinforcements 5 and lower joint reinforcements 6 protruding out from both end faces 3 each of whose tip end is thread-cut before attaching a nut 7 or fixing a binding grip thereto. A groove shape 8 formed on the end face 3 is defined such that the upper end of the opening is set at the lower part of the upper joint reinforcement 5 and the lower end of the opening is set at the upper part of the lower joint reinforcement 6, and the end parts of the opening are sloped. A shear key part 9 is formed by the gap-filling concrete part 4 being adhered in the groove shape 8. The groove shape 8 has a groove depth of 20 mm and a gradient on each end to the bottom part of 10 mm, and the shear key part 9 has a thickness of about 1/3 of the precast floor slab body 2. |
