DE2329970A1 - Three-dimensional lattice girder - consists of two parallel bars, in vertical spacing and joined together by welded U-shaped brackets - Google Patents

Abstract

Each U-shaped bracket consists of two diagonal sections with bent ends, and with a straight piece between the two diagonals. To each side of the top girder bar is welded the straight pieces of each pair of brackets, at several points. The bottom girder bars are welded onto the top sides of the bent ends of the diagonal sections. In the space between the bottom girder bars the lower part of the diagonal sections and the bent ends can be inserted and one or more additional bars welded. The additional bars may be spaced. For connection to framework, clamps may be provided for appropriate assembly.

Description

DJpWng. P. WIRTH Dr. V. SCHMIED-KOWARZIK DIpK-lng. G. DANNENiBERG Dr. P. WEINHOLD Dr. D. GUDEL

28T134 6 FRANKFURT AM MAIN

TELEPHONE (0611)

287014 CR. ESCHENHEIMER STRASSE

June 12, 1973
Gu / -mr-RH 0522

Bheinbau GmbH. 65 M a i η ζ Schusterstrasse 13

Lattice girder

The invention relates to a spatial lattice girder with at least a rod-shaped lower chord running straight through in the longitudinal direction of the lattice girder and one parallel to it running, also rod-shaped, upper chord, with lower chord and upper chord through in the longitudinal direction under

yes in each other Spaced stirrups / are connected which are welded to the side of the upper belt, furthermore from the welding parts on both sides Diagonals of the bracket pieces to the respective lower chord extend, which terminate there in ends that are bent laterally outward. ""

409882/0082

A similar lattice girder has become known through Austrian patent specification 195 084, in which the diagonally sswischen upper chord and lower chords extending bracket pieces are arranged in the transverse direction of the lattice girder. In a front view of this lattice girder, the bracket pieces used there are essentially V-shaped with laterally bent ends. These diagonal brackets are pushed over the upper chord from one side in such a way that the bent ends rest on the lower chords. They are then welded to the upper chords and the lower chords. This lattice girder has proven itself well in and of itself. However, there the upper chord is essentially only prevented from buckling outward by the diagonal brackets placed over it from the outside. Furthermore, there is no possibility of attaching additional irons in the area of the lower chords without costly additional measures.

The invention is therefore based on the object of a lattice girder to propose with the features mentioned at the beginning, a simple way of attaching additional iron in the area of the lower chords. In addition, the lattice girder should be easy to manufacture due to its high load capacity distinguish.

To solve this problem, the lattice girder according to the invention is characterized in that the lower chords are arranged on the side of the bent ends facing the upper chord at a distance from the bending point to the diagonals and are welded to the ends there.

409882/0082

This means that it is now possible to use additional irons in those formed by the diagonals, the bent ends and the lower chords Insert space. These additional irons can or also lie directly on the lower chords and parallel to them maintain the distance from them prescribed by the standard. The length of the bent ends can also be correspondingly be trained. In addition, the distance between the diagonals and the attachment point of the lower chords can be the bent ends can be varied. The fastening belt Additional iron on the lattice girder is done in the conventional way; in many cases it will suffice to just send the allowances to sledge a few places with the diagonals or lower chords. If so desired, the additional irons can be used but also / the diagonals or bent ends of the diagonals be welded in several places. In addition, one or more can in each case in the receiving space that is now formed Additional irons are inserted, depending on the particular circumstances required.

The production of such a lattice girder is extraordinary simply because the diagonals are only welded to the upper and lower chords at the specified points need to become. Because the diagonals, as will be explained in more detail below, in a side view of the lattice girder are essentially bent in a U-shape, the weld between the top chord and bracket on both sides of the top chord essentially over the length of the base of the U-profile of the bracket takes place, the top chord is simultaneously supported over a longer distance by the diagonal bracket pieces and thus particularly well secured against buckling in all directions. The measure in the area can also serve this purpose between the upper and lower chords, a ground anchor rod parallel to the chords is to be welded between the diagonals. Of the Lattice girder according to the invention is therefore also additionally

409882/0082

232997G

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Particularly highly resilient and especially secured against buckling.

A second possibility for solving the one on which the invention is based Auigabe is characterized in that only one lower chord is provided between the bracket pieces, and that additional irons are placed on the side of the bent ends facing the upper chord and fastened there. This Lattice girder is characterized by a relatively high load capacity, although only one lower chord is provided is because the diagonals of the bracket pieces can now run parallel to each other. As a result, the other embodiments in the foot area on the stirrup pieces acting spreading forces v / eiteit avoided. It must therefore ensure in this case for a separate attachment of the additional iron on the bent ends -will.

This can be done by keeping a distance from the bent End of a form board is provided, sit on the spacer, the recordings for the additional iron to have. This lattice girder can now with its formwork board and the additional iron on the construction site up to the desired Height to be poured into concrete.

The connection of additional iron or diagonal pieces and the shuttering board can be made using brackets that hold the bent Ends or overlap the additional iron, and which are driven into the formwork board. Here is it is preferred if the staples are nailed pneumatically.

409882/0082

· ■ ** - _ 2329S7G

Bs eel erwHhnt that * the girder according to the invention because of the mentioned own ehaften / can be elngeoetst in praktißcnßelioülger able eo daon chord and ala lower chords both train can be loaded in compression · The gewühlten terms "upper belt ¹¹ and" chord " Therefore only take over the traditional description of such spatial lattice girders. The lattice girder according to the invention can also be used in the reverse position, so that the lower chords point upwards, or they are etched in perpendicularly or at an epitaen angle to the perpendicular, with the belts again optionally on tension or print beanop will not be

The invention is illustrated by the following examples explained, from which calibrated further important characteristics result. Bs shows:

I ¹ Ig. 1 a piece of a lattice girder according to the invention

in perspective;
FIg. 2 the lattice girder in a side view;

3 the lattice girder in a star view;

4 is a view corresponding to S ¹ Ig. 3 in a modified version Gform alt an additional anchoring rod and allowances;

- ■> Pig. 5 also drop one forehead, not another

Changed the information fora, in which a spacing swiechen the connecting iron and the lower chords adhered to lat.

6 shows an end view of a third embodiment with

only one lower chord and shuttering board; FIG. 7 shows the lattice girder according to FIG. 6 in perspective.

In the figures, the same positon numerals denote the same parts. The lattice girder shown consists in its basic » sätalichen structure also has two torches running in parallel Lower chords 1 and one that also runs parallel to it

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232997C

Upper chord 2. Lower chords and upper chord are connected to one another by bracket pieces 5, each of which consists of two diagonally extending diagonals 4 which terminate in bent ends 5 at the bottom. A BasicatHnk 6 extends between the diagonals 4, so the JBUgölotücke in the anoicht of the Big. 2 are bent essentially in a U-shape, over the lengthwise length 6, which is 70 mm, for example, the upper belt 2 at the points 7 is not tied to the bracket 2. The figures. 3 to 5 reads that the upper chord 2 is welded in an aioue way over the length of the Baaiostückes 6 on both sides κ with the Bügolstück 3.

The lower chords 1 are placed on the upper side of the bent ends 5 and also melted there. As a result, a trough-shaped receiving space 8 is formed, which is bounded laterally by the lower chords 1 and the lower ϊβϋ of the diagonal 4 and downward by the end 5. In this receiving space 8, one or more allowances can be inserted, if this is desired. The Z-ulageeicen can be pre-welded there with the diagonals 4 »the ends 5 or the lower chords 1 or they are only baked with the diagonals 4 on some studs.

3? Ig · 4- sseigt Bio an example of execution two Zulageelo.en 9 » which are inserted into this recording space 8. There they are Lower chords 1 relatively moved towards diagonal 4; in this case there is no? Zv / ischenraum awisohen the additional iron 9 and the lower chords intended. The same result could also be achieved with a greater distance between the diagonals 4 and the lower chords 1 v / ground, with either multiple additional irons 9 in then insert the wider Aufnahnsraun β or o it is necessary to use stronger admissible gels 9.

409882/0082

ORIGINAL INSPECTED

232997C

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In 3 ig. 5 shows an embodiment in which the lower chords 1 are welded to the ends 5 on the outside. The allowances 9 and there in the kink of the diagonals 4 and ends 5 inserted, and there verochweisot or strodelt. This creates a sufficient distance between the braces 9 and the lower chords 1 created.

Pig. 4 also has an anchoring bar 10, which runs parallel to the straps 1, 2 on the haibor curve of the Gitti'trägerß and is connected to the Dia.gon.clen 4 "! This keeps the diagonals from buckling.

The benched. Lattice girder according to the invention can cit or can be used without structural steel. Because the Bottom chords 1 come to rest on the ends 5, now it's time to do it possible, the lattice girder, if so desired without a .clamping effect between two adjacent longitudinal bars a reinforcement mat. In this position, the lattice girder can be used with the reinforcement mesh in a suitable manner, be loosely connected, for example by sledding, until the desired permanent connection through daa JSingies3en in concrete achieves iet.

With the invention, lattice girders can be of the most varied Height with high buckling strength of the individual components and high load capacity can be produced, for example in a height between 7 cn and 45 cm.

Expectations

409882/0082

Claims (9)

June 12, 1973 Gu / _mr- Eheinbau GmbH. RH-0522 claims 1. Spatial lattice girder with at least one rod-shaped lower chord running straight through in the longitudinal direction of the lattice girder and a bar-shaped upper chord running parallel to it, the lower chord and upper chord being connected to one another by stirrups arranged longitudinally at a distance from one another, each of which is connected to the upper chord are welded to the side, further from the Verschweissungsstelle both sides! diagonals of the strap pieces to the $ because strength lower flange extend which end there in ends which are laterally bent outside to, characterized labeled in ζ calibration η et _"t that the Untergurtstäbe (1) on the- to the upper chord (2) facing side of the bent ends (5) at a distance from the bend point to the diagonals (4) are arranged and there are welded to the ends (5). 2. Lattice girder according to claim 1, characterized in that that in the space formed by the diagonals (4), the bent ends (5) and the lower straps / (8) additional iron (9) are inserted. 3. Spatial lattice girder according to claim 2, characterized in that the additional iron (9) lie close to the lower chords (1). 409882/0082 232997C <3- 4. Bäumlieher lattice girder according to claim 2, dadurcli characterized in that a distance is provided between the additional iron (9) and the lower chords (1) is. 5. Spatial lattice girder with at least one rod-shaped, in the longitudinal direction of the lattice girder straight through lower chord and a parallel to it, also Rod-shaped upper chord, with lower chord and upper chord by being arranged at a distance from one another in the longitudinal direction Bracket pieces are connected to one another, each of which is laterally welded to the top belt, and furthermore from the weld point on both sides of the diagonals , Bracket pieces extend to the respective lower chord, the there run out in ends which are bent laterally outwards, characterized in that only one lower chord (1) is provided between the bracket pieces (3), and that additional iron (9) on the upper chord (2) facing side of the bent ends (5) are placed and fastened there. 6. Spatial lattice girder according to claim 5, characterized in that that at a distance from the bent ends (5) a shuttering board (11) is provided on the spacer (14) sit on the seats (13) for the additional iron (9). 7. Spatial lattice girder according to claim 6, characterized in that that the connection of additional iron (9) or diagonal pieces (3) and shuttering board (11) via brackets (12) takes place, which the bent ends (5) or the additional iron. (9) overlap, and driven into the shuttering board are. 409 8 82/008 2 -X- 23299 ^ 'C WHERE- 8. Spatial lattice girder according to claim 7, characterized in that the chambers (12) are pneumatic are nailed. The patent applicant: 9 8 8 2 / O 0 8 2 ORIGINAL! NSFECtED