EP2532799B1 - Metal girder and its use - Google Patents

Description

The invention relates to a metal support for a ceiling substructure with a T-profile of a double sheet, wherein the metal support is characterized by the features of the characterizing part of claim 1. The invention further relates to the use of such a metal support for metallic ceiling substructures as the main and / or cross member, wherein the flange points in the direction of the interior of the room.

Metal supports of the generic type for ceiling substructures are known in the art. That's how it describes GB 2 456 328 A a corresponding metal carrier, which is designed in the form of a T-profile is. The metal support according to the British application is also formed from a double sheet and has at the web-side end of a hollow profile. In the web area of the metal carrier according to the British application 2 456 328 A are linear hollow sections formed. The linear hollow profiles are formed by the double plate and are present substantially over the entire length of the metal carrier. In the abovementioned British application, it is also already proposed that a plurality of such line-shaped hollow profiles can be arranged parallel to one another.

Furthermore, from the US 6,199,343 B1 a metal support for a ceiling substructure known, which is also in the form of a T-profile. In the embodiments of the metal carrier shown there, it is provided that press-in connections 55, so-called "stitching", are arranged in the web region. The stitching is achieved by pressing a punch from one side towards the other side, resulting in one-sided stitching.

GB 2 274 080 A shows a metal carrier according to the preamble of claim 1.

It has now been shown that both the one-sided "stitching" as it is in the US 6,199,343 B1 is proposed, as well as the provision of hollow profiles after the GB 2 456 328 A in the bridge area is not sufficient for the stability requirements of metal beams for ceiling substructures. It has in fact been found that such metal substrates are not sufficiently stable, in particular in the case of a fire test required for the approval (according to DIN-EN 1363 part 1), in which temperatures up to a maximum of 1200 ° C. for 360 minutes are present. Obviously at such high temperatures warping of the metal supports occurs, which can ultimately lead to that such ceiling substructures then no longer have sufficient stability, so that there is a risk that under these conditions parts can break out of the ceiling substructure.

Proceeding from this, it is therefore the object of the present invention to propose a metal support which is designed such that it withstands a fire resistance up to a maximum of 1200 ° C (according to DIN-EN 1363 Part 1) without significant delay.

This object is solved by the characterizing features of claim 1. The dependent claims show advantageous developments.

According to the invention it is thus proposed to provide the metal carrier in the web area with reinforcing ribs ("stitching"), wherein the reinforcing ribs have been pressed both from the outside of the first sheet in the direction of the second sheet as well as from the outside of the second sheet in the direction of the first sheet , The core of the invention is thus a "double-sided stitching".

The fact that now the reinforcing ribs have been pressed not only from one side into the web area, but from two sides, it comes to the fact that the metal support, even under extreme conditions, such as a fire resistance of up to 1200 ° C, no distortion. By "double-sided stitching" obviously the structure of the metal support in the web area is so positively influenced that do not adjust the known from the prior art disadvantages in terms of the distortion and the stiffening resistance.

Preferably, the metal carrier is designed so that the pressed-in reinforcing ribs ("stitching") parallel to the flange in line shape, preferably over the entire length of the metal carrier, are pressed. The invention in this case comprises embodiments in which the press-ins are alternately, i. from one side and the other side, as well as embodiments in which there are several pressings successively from one side and then again several pressings in succession from the other side. In this case, it is particularly preferred if the reinforcing ribs alternate in a line shape in each case, i. an injection from the outside of the first sheet in the direction of the second sheet, and then the next press-in from the other side of the sheet are introduced. The distances between the pressings can also be variable.

A further preferred embodiment then provides that the reinforcing ribs are pressed into two or three lines arranged parallel to the flange. Within the respective parallel lines with the "stitching", the number of impressions that are pressed in from the first side in the direction of the second side and vice versa may vary.

Of course, the invention also includes embodiments in such a way that the reinforcing ribs are pressed in line form starting from the outside of one of the sheets and are pressed in parallel in a second line arranged therefrom, starting from the outside of the other sheet. For this embodiment, it can also be provided that the reinforcing ribs of the two lines are arranged on a gap are, that is, a press-fitting, which is pressed from one side in the direction of the other sheet, is offset from the other press-in, which has been introduced from the other side, arranged.

In the case of the metal carrier of the invention, it is preferred if the pressed-in reinforcing ribs are arranged parallel to the flange in line form in the vicinity of the flange.

A further preferred embodiment then provides that reinforcing ribs are provided in a second line parallel thereto, wherein these reinforcing ribs are then provided at the web-side end.

The impressions are preferably provided in the last third of the web area. The two-sided "stitching" can not be distributed in line form, but distributed over the surfaces of the web area. Also for this embodiment, the number of press-in is variable.

The reinforcing ribs are introduced into the web by a two-step process. In the first process step, a tab is cut free from the material. In the second process step is then carried out by a stamp pressing, so that a flow of the material of the tab takes place. By this pressing is then ensured that the tab can not be pushed back into the recess.

Of course, the invention also includes embodiments in which the compression is produced by a one-step process, i. In one operation, the tab is cut free and pressed.

The compression is made by a single punch or by a double punch in a rectangular shape. The long sides of the rectangle are in the range of 2 to 8 mm and the short sides are 0.1 to 1.5 mm long.

To further improve the stiffening ability and to improve the distortion is still provided in the metal support according to the invention that in addition to the two-sided "stitching" nor a line-shaped reinforcing profile is provided. This linear reinforcing profile can be formed as a hollow profile by the two double sheets and is preferably arranged parallel to the line-shaped "stitching". In this case, a preferred embodiment provides that the linear reinforcing profile is arranged between two line-shaped pressings.

The metal carriers according to the invention may additionally, as is known per se from the prior art, still have openings which are provided for latching the metal carriers to one another. The metal carriers according to the invention may then also have connectors, which are arranged on the front side at the respective ends of the metal carrier, which are provided to lock the metal carrier with each other through the opening.

The metal carriers according to the invention may be metal carriers of a length of 50 to 400 cm, depending on the application. Such metal beams can be used for ceiling substructures, which then act either as a main or as a cross member. The selection of the length of the metal support depends of course on the application, i. depending on whether it is a main or a cross member. The T-profile of the metal carrier preferably has a web height in the web region between 1 and 8 cm.

The material of the metallic supports is preferably a steel sheet of a cold-rolled strip. The steel grades include integrated carbon steels with carbon mass fractions up to 1%, a preferred steel sheet is DX 51 Z 100.

The metal support according to the invention is as described above particularly suitable for metallic ceiling substructures as the main and / or cross member, wherein the flange points in the direction of the interior of the room.

• Figur 1 zeigt im Querschnitt einen Metallträger mit einem zweiseitigen Stitching in zwei Linien.
• Figur 2 zeigt ein weiteres Beispiel, bei der die Einpressungen in der zweiten Linie nur von einer Seite aus durchgeführt worden sind.
• Figur 3 zeigt einen erfindungsgemäßen Metallträgen, mit einem Hohlprofil.
• Figur 4 zeigt in perspektivischer Ansicht einen Metallträger mit einem beidseitigen Stitching in einer Linie.
• Figur 5 zeigt ebenfalls in perspektivischer Darstellung einen Metallträger mit einem Stitching in zwei Linien.
• Figur 6 zeigt im Längsschnitt in vergrößerter Darstellung eine Verpressung, die mit einem Doppelstempel hergestellt worden ist.
• Figur 7 zeigt ebenfalls in vergrößerter Darstellung ausschnittsweise im Längsschnitt eine Verpressung die mit einem Einfachstempel realisiert worden ist.

The invention will be explained in more detail with reference to seven figures, without limiting the subject matter to these embodiments.

• FIG. 1 shows in cross section a metal support with a two-sided stitching in two lines.
• FIG. 2 shows another example in which the impressions in the second line have been performed only from one side.
• FIG. 3 shows a Metallträge invention, with a hollow profile.
• FIG. 4 shows in perspective view a metal support with a double-sided stitching in a line.
• FIG. 5 also shows in perspective a metal support with a stitching in two lines.
• FIG. 6 shows in longitudinal section in an enlarged view a compression, which has been produced with a double punch.
• FIG. 7 also shows in enlarged scale fragmentary in longitudinal section a compression which has been realized with a single punch.

In FIG. 1 is shown in cross section a metal carrier 1 in the form of an inverse T-profile. The metal carrier after FIG. 1 is formed of a double sheet 3, 4 and has at its web-end a hollow profile 5, which has been formed by the two double sheets. In FIG. 1 is now seen in cross-section that the pressings (stitching) 6, 6 'have been introduced from both sides in the web portion 2 of the metal carrier 1. In the example after the FIG. 1 a first line shape has been formed at the flange end, in which case the press-in 6 from one side, ie from the outside of the sheet 3, have been introduced, whereas the press-in 6 'have been pressed from the outside of the sheet 4. The same applies to the impressions, which at the web-end below the Hollow sections 5 are provided. The embodiment according to FIG. 1 thus has a double-sided stitching, each with two lines are provided with alternating pressings.

The example after FIG. 2 now corresponds to the one after FIG. 1 However, here the indentations 6 have been introduced at the web-side end only from one side, ie only from the outside of the sheet 3. In contrast, the indentations 6, 6 ', which are arranged at the flange end, always from the outer side. 3 (Press 6) and from the outside 4 (press 6 ') have been made.

In FIG. 3 Now, a metal carrier according to the invention is shown, which by the example FIG. 2 emanating and differs in that between the flange-side line-shaped press-in and the web-side linear press-in nor a hollow section 8, which is formed by the two sheets 3, 4, is arranged. This achieves a further improvement in rigidity and distortion.

In FIG. 4 is now a perspective view of a metal support 1, which illustrates that the press-in 6, 6 'in line form and thereby alternately formed at the flange-side end of the web portion 2. The press-in 6 and the press-in 6 'are characterized in the figure made it clear that the indentations 6 'are shown dark, which is an injection, which has been led from the side shown in the direction of the other side. The press-6, however, has been made from the non-visible page in the page shown. At this point it should also be emphasized that the invention of course includes all embodiments in which, for example, then two or three pressings have been made in the same direction and then two or three pressings have been carried out from the other side. Also, it is not necessary that there are always the same number of stitchings from each side, but the invention also includes embodiments in which, for example, in one line only 20% or 30% of the impressions have been made in one direction and correspondingly 80% or 70% of the impressions from the other direction.

In FIG. 5 is now in turn a perspective view of a metal support 1 shown, in which the press-in 6, 6 'are executed in two lines, on the one hand in a first line, which is formed on the flange side, and in a second line, which is provided at the web-side end , The perspective view of the metal carrier after FIG. 5 corresponds to the representation of the metal carrier in cross section FIG. 1 , From the illustration to FIG. 5 It is also clear that the distances of the respective impressions can be chosen arbitrarily. In the example after the FIG. 5 are provided between the press-in, which are provided at the web-side end below the hollow section 5, much greater distances than for the press-in, the flange-side end are arranged. Also, the distances of such impressions may vary within a line.

In the FIGS. 6 and 7 is shown in fragmentary form in the form of an enlarged view in a longitudinal section, as the pressing 6 or 6 'by a single punch ( FIG. 7 ) and by a double stamp ( FIG. 6 ) has been realized.

Claims (14)

1. A metal girder (1) for a ceiling substructure with a T-profile made from a double metal sheet, wherein a first metal sheet (3) is arranged lying flat against a second metal sheet (4) in the web region (2), and a hollow profile (5) is formed from the double metal sheet at the web-side end, wherein pressed-in reinforcing ribs (6, 6') are arranged in the web region (2), wherein the reinforcing ribs (6, 6') are formed by pressed tabs which have been cut free, and have a rectangular shape, characterised in that the reinforcing ribs (6, 6') are pressed in, starting from the outside of the first metal sheet (3), in the direction of the second metal sheet (4) and, starting from the outside of the second metal sheet (4), in the direction of the first metal sheet (3), the long side of the rectangle being 2 to 8 mm and the short side being 0.1 to 1.5 mm, and in that additionally at least one linear reinforcement profile (8) is present in the web region (2) preferably over the entire length of the web (2).
2. A metal girder according to Claim 1, characterised in that the pressed-in reinforcing ribs (6, 6') are pressed in parallel to the flange (7) in line form, preferably over the entire length of the metal girder (1).
3. A metal girder according to Claim 2, characterised in that the reinforcing ribs (6, 6') are pressed in in line form alternately from the outside of the first metal sheet (3) and the outside of the second metal sheet (4).
4. A metal girder according to Claim 2 or 3, characterised in that the reinforcing ribs (6, 6') are pressed in in two or three lines arranged parallel to the flange (7).
5. A metal girder according to one of Claims 1 or 2, characterised in that the reinforcing ribs (6, 6') are pressed in in line form starting from the outside of one of the metal sheets (3, 4) and the reinforcing ribs (6, 6') are pressed in starting from the outside of the other metal sheet (3, 4) in parallel at least in a second line arranged thereto.
6. A metal girder according to Claim 5, characterised in that the reinforcing ribs (6, 6') of the two lines are arranged offset.
7. A metal girder according to at least one of Claims 1 to 6, characterised in that the pressings (6, 6') are produced preferably in a rectangular shape by a single die and/or by a double die.
8. A metal girder according to one of the preceding claims, characterised in that the reinforcement profile (8) is formed as a hollow profile by the two double metal sheets (3, 4).
9. A metal girder according to at least one of Claims 1 to 8, characterised in that the flange (7) consists of the individual metal sheets and is reinforced by means of an additional metallic closing metal sheet.
10. A metal girder according to at least one of Claims 1 to 9, characterised in that the web-side end of the T-girders is a hollow profile of rectangular shape.
11. A metal girder according to at least one of Claims 1 to 10, characterised in that the metal girder (1) has a length of 50 to 400 cm and the T-profile of the metal girders (1) has a web height of the web region (2) of 1 to 8 cm.
12. A metal girder according to at least one of Claims 1 to 11, characterised in that the metallic material of the girder (1) is a thin steel sheet.
13. A metal girder according to at least one of Claims 1 to 12, characterised in that openings are provided in the web region (2) of the metal girder (1), through which openings the connectors arranged on the end faces of the metal girders (1) can be guided, which connectors serve for engaging with connectors of the other metal girders (1).
14. Use of the metal girders according to at least one of Claims 1 to 13 for metallic ceiling substructures as main and/or transverse girders, wherein the flange points in the direction of the interior of the room.

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