Static structures (e.g. – buildings) – Wall – ceiling – or floor designed for utilities – Load-bearing – prefabricated – abutting units with aligned...
Patent
1990-03-16
1991-05-21
Kannan, Philip C.
Static structures (e.g., buildings)
Wall, ceiling, or floor designed for utilities
Load-bearing, prefabricated, abutting units with aligned...
52336, 52450, 52743, E04B 548
Patent
active
050164112
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a building structure, comprising a first plate and means attached thereto forming parallel channels, of which at least some are filled with concrete forming ribs.
Floors and walls--and particularly wooden floors often have such a low stiffness that they vibrate under dynamic loads. Several attempts have been made to reinforce and stiffen such floors but without technically and economically satisfactory results.
It is known to use corrugated steel plates as bottom in forms for pouring concrete floors. The upwardly concave portions of these plates become filled with concrete during the pouring and therefore form stiffening ribs depending on the bottom side of the floor, while the steel plate itself becomes an integral part for the concrete floor and forms a reinforcement thereof.
It will be understood that such corrugated steel plates have relatively low stiffness, particularly transversally of the longitudinal direction of the corrugations, a fact requiring particular considerations regarding both support and loading, e.g. traffic by persons and equipment, before the concrete is poured. The concrete will fill all upwardly open corrugations so that the concrete-filled ribs usually will be placed relatively close to each other and the floor will be correspondingly heavy. Furthermore, the center of gravity of the corrugated plate will be situated midway between the top and bottom of the corrugations, which leads to the fact that the reinforcement constituted by the steel in the plate will not have the optimum position near the bottom of the ribs. Since the corrugated plate forms an integral part of the concrete floor, it will not have appreciable sound dampening properties.
In order to alleviate some of these drawbacks, one has provided the corrugated plate with a plane steel plate on the bottom side. Such a plate is known e.g. from U.S. Pat. No. 4,630,414, FIG. 3. However, neither this plate does not solve the above-mentioned problems in a satisfactory manner, and it is relatively expensive.
One of the objects of the present invention is thus to provide a building structure of said type, which to a large extent avoids the drawbacks and deficiencies mentioned above.
According to the invention this is obtained by the building structure comprising a second plate which is parallel to the first plate and also is attached to the channel forming means, the plates being substantially continuous and the ribs being provided with reinforcements in any portion subjected to high tensile loads.
By employing two plates being substantially continuous one is able to obtain a relatively stiff structure even with the use of inexpensive materials. The two plates also ascertain that the channels are covered on both sides, thus providing control with the channels to be filled with concrete. This permits limiting the number of stiffening and reinforcing ribs to the extent necessary for the use at hand, thus saving both weight and cost. Such light structures may be used e.g. in roofs and walls.
If the building structure is to be used as flooring, it is suggested according to the invention that the second of the two plates be provided with a cover of concrete, the concrete in the cover and in the ribs being in communication with each other through holes taken out in the second plate so that a monolithic connection is formed between the ribs and the cover. Also in this case one has full control with the number of channels which are filled with concrete for the formation of ribs. This entails that the distance between the plate and the heigth of the ribs may be made relatively large, so that the effect of the ribs becomes correspondingly larger and the necessary number of ribs becomes correspondingly smaller. In the event that the channels are formed by a corrugated element between the plates, it will not be necessary to pour concrete in more than one third of the channels even in strongly loaded floors.
One has found that a building structure according to the invention gives surprisingly low sound tran
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patent: 4529051 (1985-07-01), Stolz et al.
patent: 4630414 (1986-12-01), Ting
A/S Selvaagbygg
Kannan Philip C.
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