Abstract: The invention relates to a hollow body concrete floor or hollow body concrete slab made from concrete having reinforcements and conical hollow bodies (1) the cross-section of which is essentially round, oval or more than quadrilateral, wherein hollow bodies (1) are arranged between an upper and a lower reinforcement layer (15, 16) at least in sections essentially in the most compact configuration possible, wherein the areas between the upper and the lower reinforcement layers (15, 16) may be provided without hollow bodies (1). The object of the invention is to provide an improvement over conventional hollow body concrete floors. This object is solved in that spacers (8, 9) are arranged between upper reinforcement layer (15) and hollow bodies (1) on the one hand and between lower reinforcement layer (16) and hollow bodies (1) on the other hand, and that vertical reinforcements (17) are inserted in at least some of the interstitial spaces formed in each case by three adjacent hollow bodies (1).

Abstract: To product a steel-reinforced hollow-body ceiling, reinforcing cages (10) are fitted to the ceiling area. The reinforcing cages (10) have three U-shaped stays (12) each made of round steel at an angular distance, with the U-shaped stays being welded together with two horizontal rings (18, 20) to form a stable structure which can be walked upon. A container (22), open at the bottom and having aeration holes (26) in the cover (24) can be hooked into this reinforcing cage (10). In this way the container (22) becomes buoyancy-free. Reinforcing cages (10) and containers (22) are stackable, forming truncated pyramids with a hexagonal base. The reinforcing cages (10) can be positioned with little space between them. They can be walked upon and act as spacers for the upper reinforcement of the concrete ceiling. Once concrete has been poured into place, a hollow-body reinforced-concrete ceiling or slab in honeycomb structure results.

Abstract: In the production of a compression-proof shelter a semi-finished car garage is used consisting of reinforced lightweight thin concrete walls and being open at the front side. It is required that a personal living chamber is partitioned off against a filtering chamber by a compression-proof thick cross wall. If such a cross wall would be prefabricated the housing would become heavy and cannot easily be transported. Therefore only a pair of thin cross walls are installed leaving a hollow chamber therebetween. The housing is installed with all technical equipment and then is transported to the place of use and there the hollow chamber is filled with concrete avoiding any necessity to work within the housing. The cross wall can be prefabricated with all necessary technical equipment and is pushed into the housing before or after having been transported to the place of use.