Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Fabric or lattice; e.g. – indeterminate grating
Patent
1995-01-20
1998-03-03
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Fabric or lattice; e.g., indeterminate grating
52664, 52480, 526503, 108 511, E04C 242
Patent
active
057222118
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a rail structure to support flat structural elements, with a first plurality of paired stringers of parallel arrangement extending in a first plane, with a second plurality of paired stringers of parallel arrangement extending in a second plane, and with connecting pieces inserted in intersection areas formed by intersecting stringer pairs and joined to each bordering stringer.
Such rail structure is previously known from DE-OS 1 684 602. Provided as stringers are bar-shaped, cross-sectionally round wires or rods which with a plurality of connecting pieces stamped from sheet metal and introduced in the intersection areas are joined to one another so as to form a rail structure. In plan view, the connecting pieces are cruciform and connected to the individual stringers by bending the projections forming the cross shape with the aid of a special pair of pliers around the individual stringers. The rail structure receives its bending stability by clamping the stringers in the annularly bent projections.
The bending stability of the rail structure depends decisively upon the bending load strength of the individual stringers. With the stringers featuring a roundish, small cross-sectional area, as described in the publication, so that each individual stringer possesses only a relatively slight bending load strength, the bent-over projections in case of a load acting essentially perpendicularly on the plane formed by the rail structure are exposed to small forces. A risk of loosening of the clamping, in that the projections open up, is not given.
But when a high bending stability of the rail structure is desired, stringers with a distinctly greater cross-sectional area need to be used. The projections of the connector require then an appropriately stable layout so as not to bend open due to the higher load occurring then, in order to guarantee a reliable and durable fixing of the stringers. Such higher loads can be counteracted by providing an appropriately greater material strength of the connecting pieces. However, this will increase also the force necessary for bending the projections over and clamping them, so that a sufficient clamping can be carried out only with mechanical bending devices and/or presses. Besides, the metallic rail structure would assume a very heavy weight due to such a measure, impeding its handling.
Clamping cross-sectionally angled stringers is problematic, since the stringer edges provide only a small contact surface for generating the desired frictional contact.
Unfavorable on the object of this publication, additionally, is that the projections of the connecting pieces are bent around the rail elements, making a contact between a flat element arranged on the rail structure and the individual stringers impossible. When a flat element is to be reinforced by the rail structure against bending loads, said flat element already needs to be sufficiently stable to prevent a sagging between the contact areas with quasi punctual action, of the connecting pieces.
Known from FR-A-2 557 900 is a rail structure where roundish posts meant to be anchored in the ground have on both sides stringers arranged, with the stringers enclosing the posts forming the outside of a bottom surface backed by inside beams. The beams are placed on the inside stringers and arranged so as to extend parallel to one another in one direction. Provided on the inside of the three-dimensional rail structure, which for instance is formed of several stringers and beams arranged at different levels of the posts, are liners which, while arranged between the beams which are arranged on the stringers at various levels and form floors, form a wall which outwardly bounds the interior of the rail structure. All of the posts are located outside the interior of the rail structure, thereby not only backing the liner, but drying again after getting wet, for instance by rain, relatively quickly.
The posts serve to absorb the force of the weight, which for instance is distributed over several floors, and the two-side
Aubrey Beth A.
Friedman Carl D.
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