Static structures (e.g. – buildings) – Machine or implement
Patent
1997-06-02
1999-10-26
Kent, Christopher T.
Static structures (e.g., buildings)
Machine or implement
52 361, 521272, 522825, 526551, 527317, 527362, 527372, 403188, 403193, 403195, 403196, E04C 330
Patent
active
059706791
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a metal structure that finds application in structural metalwork, for constructing industrial sheds with or without tramways, multi-storey buildings, aircraft hangars, loadbearing structures in general, shelving for large stores, cantilever roofs, intermediate floors, fire escape stairways, canopy roofs and anything else that can be made from cold-formed sections.
SUMMARY AND OBJECTS OF THE INVENTION
With the present invention it is possible to construct many kinds of built-up sections with different geometries but of the same kind, which permit the use of a fastening device without welding or making holes in the sections; this permits the use of thinner thicknesses than is usual in the use of conventional cold-formed sections. It is well known that in order to form a connection on a thin cold-formed section, current practice is to employ electric welding or drilling, and the surfaces involved in the connection require reinforcing with welded plates (a laborious operation whose results are always poor as far as the strength of the reinforced part is concerned) or by greatly increasing the thickness of the section to prevent it from plastically deforming when stresses are imposed. With the present invention, however, not only are the working processes greatly simplified, thus reducing production times, but also--and this is a particularly important point--the weight of the structures is reduced by some 25% compared with conventional structures, as it is possible to optimize to the maximum (for the purposes of strength) the use of special kinds of sections depending on the required loads.
The present metal loadbearing structure comprises cold-formed sections built up from elementary sections, and also fastening devices for connections or special parts of the kind already described in another earlier patent document (CT92A 000016 of 04.05.1992), and it is characterized in that a plurality of elementary sections are joined stably together by means of connecting braces inside the built-up section, said joined elementary sections defining longitudinal slots with their longitudinal lips which are bent inwards and each inclined with respect to that opposite so as to converge towards the interior; and in that fastening devices comprising a channel die and one or more pressure pieces can be fitted along the slots in order to clamp with screw means the lips that define said slots and deform them with a locking action.
In one possible embodiment, dies of at least two fastening devices are rigidly connected to each other in such a way that the two devices can be fitted at corresponding positions along slots of one built-up section.
In a possible development of the invention, two by or three or four dies can be connected stably by means of shaped plates welded to said dies; in this case the multiple fastening devices are insertable into open portions of slots at the ends of the built-up sections.
In another possible development of the invention, two opposing dies are connected by means of bars which engage with said dies, even after they have been positioned inside the built-up section. Said bars can also be used for clamping the pressure pieces.
A built-up section can be formed from two symmetrical elementary channel sections that define two opposing slots; this built-up section may be rectangular or even square in cross section. Alternatively, a built-up section can be formed from four angle sections that define four slots in opposing pairs.
Still another built-up section can be formed from one elementary channel section and two elementary angle sections, that define three slots, two of which are opposite each other; said built-up section may thus be approximately rectangular or square in cross section.
In other embodiments, a built-up section can be formed from one elementary section of essentially channel design and one other elementary angle section or equivalent, which define two slots; said built-up section being approximately triangular or trapezoidal in cross
REFERENCES:
patent: 2508032 (1950-05-01), Kennedy
patent: 4261156 (1981-04-01), Fromont et al.
patent: 5553347 (1996-09-01), Navon
patent: 5634300 (1997-06-01), Huebner et al.
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