Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1996-10-18
1999-11-02
Smith, Creighton
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
52696, 411508, E04C 302
Patent
active
059747595
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national stage of PCT/1895/00028 filed Feb. 9, 1995 and based, in turn, on Austrian National Application A 268/94 filed Feb. 10, 1994 under the International convention.
FIELD OF THE INVENTION
The invention relates to a latticework beam for reinforcing walls or ceilings made of cast material, consisting of two longitudinal chords with diagonal bars between them, whereby the diagonal bars consist of a sheet steel strip bent in a zig-zag shape, running through the latticework beam and which is connected at its bending points with the profiled longitudinal chords, also made of sheet steel strips.
BACKGROUND OF THE INVENTION
In a latticework beam known from German Patent 835 647, the continuous sheet steel strip of the diagonal bars runs so that the width of the strip is parallel to the plane of the latticework beam. It seems that the inventor considered this to be necessary, in order to achieve a connection between the longitudinal chords and the diagonal bars solely by clamping. Here the disadvantage is the lack of rigidity of the latticework beam in transverse direction, which is particularly noticeable during transport.
OBJECT OF THE INVENTION
It is the object of the invention to provide a latticework beam of the aforementioned kind, whose production is simple, but which still has a high degree of rigidity. Moreover with such latticework beams it should be possible to form a support framework in a simple manner.
SUMMARY OF THE INVENTION
This object is achieved in a steel latticework beam wherein that the width of the trough-shaped sheet steel strip forming the diagonal bars and the width of the longitudinal chords extend transversely to the longitudinal median plane of the latticework beam. In the area of junction points, the sheet steel strip of the diagonal bars has a segment running parallel to the longitudinal chords.
The sheet steel strip can be obtained by cutting galvanized steel sheets into strips and forming them accordingly. Since the zinc has the tendency to move to the cut edges, these cut edges are also protected against corrosion.
For the connection of the diagonal bars with the longitudinal chords, it has proven to be suitable to connect the throughgoing sheet steel strip of the diagonal bars with the longitudinal chords at junction points by compression.
A support framework of latticework beams according to the invention can also be formed in a simple way by providing the longitudinal chords with spaced-apart bores and by connecting at least two approximately parallel latticework beams with spacers also provided with bores, by means of connection elements placed in the bores, whereby the spacers consist of a galvanized sheet steel strip.
In order to simplify the production and storage, the sheet steel strips of the longitudinal chords and the spacers are of the same type.
The connection between the longitudinal chords and the spacers does not have to withstand great forces, it serves merely for securing the latticework beam placed in a mold, whereby subsequently a cast mass, particularly concrete or lightweight concrete, is poured into the mold. It is therefore possible that the connection elements be designed as plastic plugs equipped with an elastic tab having a projection, which resiliently engages and disengages when inserted into a bore. Such plastic plugs have only to be pressed into the bores to insure a firm connection between the longitudinal chords and the spacers.
The plastic plugs may also be used in a simple way to insure the secure embedding of the support framework in the cast mass. This simple step consists in that the plastic plugs project beyond the spacers on the side opposite to the tabs. Therefore due to the plastic plugs a space is forcibly maintained between the mold walls and the support framework.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying d
REFERENCES:
patent: 1865059 (1932-06-01), Ragsdale
patent: 2136071 (1938-11-01), Braden
patent: 2284898 (1942-06-01), Hartman
patent: 2865059 (1958-12-01), Scriven
patent: 3122224 (1964-02-01), Blickensderfer
patent: 4739543 (1988-04-01), Harris, Jr.
Dubno Herbert
Smith Creighton
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