| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of a hollow slab unit. SOLUTION: In the hollow slab unit U with truss rods, a hollow pipe void form 2 is arranged between parallelly arranged triangular truss rods 10 and upper arranged rods 3 and lower arranged rods 4 crossing at right angles the truss rods 10 are welded to the truss rods 10. The truss rods 10 are comprised of one upper main rod 11, two lower main rods 12, and respective wavelike oblique rods 13 between both main rods. Respective rods are mutually welded to each other. Both lower sides of the void forms 2 are brought into contact with the respective oblique rods 13 of adjacent truss rods 10 and the upper face is brought into contact with the upper arranged rods 3 and fixed between the truss rods 10. By the contact with the three points 3a, 13a, 13a, the lateral and vertical movement of the void form 2 is restricted by the three point support and fixed in the unit U by the upper arranged rods 3 and both oblique rods 13 bearing the strength of the slab. The unit U has the iron plate 1 at the underface, and the iron plate forms the permanent form. COPYRIGHT: (C)2003,JPO
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