| 摘要 |
PROBLEM TO BE SOLVED: To attain the efficiency of construction work for a circular hole void slab, to reduce the weight of a concrete slab and to efficiently transmit load in two directions by reinforcing shearing yield strength in a circular hole direction and its orthogonal direction, and embedding a lightweight embedded material inside the bidirectional slab. SOLUTION: Reinforcements are arranged longitudinally and laterally on the lower side of a form 1, and reinforcements are arranged only in a fixed direction on the upper side of the form 1. Cylindrical lightweight bodies 7 each having a plurality of recessed parts 6 cut out to be orthogonal to a longitudinal direction, at the upper and lower faces are arranged on the reinforcements on the lower side continuously in the longitudinal direction in such a manner as to be dropped from between the reinforcements on the upper side. Other reinforcements are arranged orthogonally to the upper side reinforcements already arranged on the upper faces of the thus lined-up lightweight bodies 7, and finally concrete 8 is placed to form the hollow slab. COPYRIGHT: (C)2004,JPO&NCIPI
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