| 摘要 |
PROBLEM TO BE SOLVED: To provide a void slab satisfying both of an equivalent weight slab thickness and an equivalent slab thickness. SOLUTION: A void form 1 is formed into a shape such as an L-shape symmetric with respect to one straight line 5a of orthogonal straight lines 5a and 5b crossing the center in a plane vision and asymmetric to the other strait line 5b. In this void slab, most of a slab including the void forms 1 is constructed of an assembly of slabs having the void forms 1 arranged in four positions at equal intervals on the circumference of the same circle symmetrically to the diameter line of the circle A. In comparison with a void slab of a linear pipe type void form or a rectangular void form, this void slab is slightly heavy in weight but provided with a rigidity ratio compensating the heavier weight, a larger equivalent slab thickness, and a good sound insulating property. COPYRIGHT: (C)2004,JPO
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