Static structures (e.g. – buildings) – Wall – ceiling – or floor designed for utilities – Multiple passageway or multicellular load-bearing units
Patent
1998-08-11
2000-09-05
Friedman, Carl D.
Static structures (e.g., buildings)
Wall, ceiling, or floor designed for utilities
Multiple passageway or multicellular load-bearing units
52338, 52339, 52335, 527981, E04C 208
Patent
active
061124826
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to floor and ceiling structures and more especially to composite floor and ceiling structures of concrete and steel.
2. Description of Related Art
Composite floor and ceiling structures which comprise a profiled steel deck supported on the lower flange of steel beams and covered in situ with a concrete layer are known. Advantages of such structures include reductions in floor thickness and weight, ease and speed of construction and savings in labour and cranage costs during assembly.
SUMMARY OF THE INVENTION
One problem associated with existing composite structures concern the need to ensure the adequacy of the shear bond between the concrete layer and the supporting steel beams.
It is an object of this invention to provide enhanced keying between the support beams and the concrete layer to ensure lasting connection therebetween.
It is also an object of this invention to provide improved servicing capabilities for buildings by including ducting in the steel decking and through the support beams to act as air plenums, and using the ceiling/floor structure to form either a full air-conditioning duct or as a thermally transparent surface to enhance thermal efficiency and air flow thereby reducing air-conditioning costs.
According to the present invention in one aspect, there is provided a composite floor or ceiling structure which comprises a profiled steel deck supported by a plurality of I-section steel beams each having an upstanding web bordered by upper and lower flange plates and covered in situ with concrete, the deck comprising a plurality of side-by-side elongate profiled deck members each including an upper generally horizontal surface bordered by downwardly and outwardly inclined side surfaces, the upper flange plate of each beam having formed in its upper surface a plurality of grooves in a pattern to increase bonding between the beam and its covering of concrete.
Preferably, each supporting beam is rolled as a single piece with the width of its lower flange plate greater than that of its upper flange plate to define a supporting platform for the steel deck.
Preferably the grooves of the pattern extend across the full width of the upper surface of the upper flange of each beam and are inclined to the longitudinal axis of the beam. The grooves may define a generally symmetrical diamond-shaped pattern.
Edge laps may extend outwardly from the edge of one or both inclined side surfaces of one or more deck members.
The upper surface of each deck member and/or edge lap may be formed with a dove-tail groove.
The profiled deck members may be supported at their ends on shaped diaphragms secured to the lower flange plate of the respective beam.
Concrete may be pumped, poured onto or otherwise applied to the upper surface of the steel deck and the supporting beams.
A steel anti-crack mesh may be supported by the beams and/or the steel deck before concrete is applied to the structure.
The shape of the steel deck may be such as to provide between the undersurfaces of its inclined side surfaces passageways for receiving ducting for the flow of heating and/or cooling medium, specifically air conditioning ducting. The installed floor structure may act, in use, as a heat reservoir.
The invention will now be described by way of example only with reference to the accompanying diagrammatic drawing
BRIEF DESCRIPTION OF THE FIGURES OF DRAWINGS
FIG. 1 is a perspective view from one side of a supporting beam of a composite structure in accordance with this invention;
FIG. 2 is a perspective view of the supporting beam shown in FIG. 1 and steel decking of a composite structure in accordance with the invention; and
FIG. 3 is a perspective view of a composite structure in accordance with the invention partially covered with an in-situ concrete layer.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As will be seen from the drawings, each support beam 1 is of asymmetrical I-section and has a lower flange plate 2 whose width is greater than
REFERENCES:
patent: 602274 (1898-04-01), Sill
patent: 934939 (1909-09-01), Schlafly
patent: 1073906 (1913-09-01), Kahn
patent: 1449340 (1923-03-01), Menzer
patent: 4527372 (1985-07-01), Ryan
patent: 4653237 (1987-03-01), Taft
patent: 4700519 (1987-10-01), Person et al.
patent: 5509243 (1996-04-01), Bettigole et al.
Smith Majella MacDermott
Wright Peter
A Phi Dieu Tran
British Steel plc.
Friedman Carl D.
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