| 摘要 |
PROBLEM TO BE SOLVED: To provide a lattice-shaped hollow slab capable of minimizing a thickness of a slab layer in a strength allowable range by arranging bar arrangement of sub-reinforcements in an efficient lattice shape around a hollow part in a slab at slab work of a long span such as a bridge and a building in civil engineering construction. SOLUTION: In a slab 1 for arranging a main reinforcement between a surface of the slab 1 and a hollow part 2, a section is formed so that the hollow part 2 in the slab 1 can be partitioned small in the lengthwise direction in a range of not exceeding a diameter of the hollow part 2, sub-reinforcements 4 are arranged in a concrete area of a diametrically small part of the hollow part 2, and these are arranged in a lattice shape of crossing the main reinforcement 3. In this case, a pipe diameter of the hollow part in the slab is made different in the lengthwise direction, the sub-reinforcements are effectively arranged in a pipe diameter small part, and weight is reduced while thinning a thickness of the slab to obtain a highly strong slab.
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