| 摘要 |
829,308. Floors. UDALLS PRESTRESSED CONCRETE Ltd. July 5, 1957 [Aug. 14, 1956], No. 24835/56. Class 20(4) A concrete floor is made by placing cores 11 having open bottoms 27 on pre-cast concrete blocks 19 on which they are located by lips 20 on the cores and casting concrete around and over the boxes. Prestressed reinforcing rods 14 are laid between the cores. The cores comprise a number of boxes 16 connected by staples and made of waterproof cardboard, may be folded flat and may contain horizontal and vertical partitions, Fig. 3 (not shown).
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