| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete void slab positioning the height of a void form 40 by making use of buoyancy and facilitating the mounting of an upward moving guide 11 of the void form. SOLUTION: In two-way concrete void slab placing the blowing resin-made void form 40 in a lattice-like checkers space S consisting of upper end lines 2 and lower end lines 3, the void form inserts a downward guide lever 11 of a fixed supporting lever 10 in the upper end lines 2 through a hole 43, and the void form is led to the guide lever 11 by buoyancy to move it upward to position it on a required height and is embedded by placing a concrete C. Thus, in the case the lever 10 having the upward moving guide 11 is fixed to the upper end lines 2, there is no need of elimination work of the levers 10 and 11. If there is an uneven step 44 in the lower part of the void form, since the concrete is poured in the uneven step to effectively operate buoyancy, the void form is smoothly moved upward. The void form is installed after both up and down end lines 2 and 3 have been arranged. COPYRIGHT: (C)2006,JPO&NCIPI
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