DE8717208U1 - Formwork crossbar made of steel for connecting several formwork panel supports - Google Patents

Description

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The invention relates to a formwork crossbar made of steel for connecting several formwork panel supports, which has a profile support made of bent sheet metal with a first flange area, a second flange area and a web between the two flange areas.

There are several known ways of constructing formwork for concreting. One of these types uses relatively large-format formwork panels, each of which is supported on the back by several spaced-apart beams, whereby these beams are connected to one another by belts or bars running across them. The crossbars are used on the one hand to connect several beams assigned to a common formwork panel to form a dimensionally stable unit. On the other hand, they are used to attach tension anchors between spaced-apart formwork panels to shape the two surfaces of concrete bodies to be produced, in particular wall-like ones. And they are also generally used to enable a connection between adjacent formwork panels and their formwork panel beams by means of coupling pieces between two adjacent crossbars, whereby this connection should be designed in such a way that the adjacent formwork panels are aligned with one another as precisely as possible and are clamped together as tightly as possible so that no formwork joints remain with the risk of concrete running through. &Sgr;&eegr; In most cases, the formwork panel supports are designed to run essentially vertically or at an angle corresponding to the formwork panel inclination; but an essentially horizontal run also occurs, especially in the formwork of tunnel structures or the like. In most cases, the formwork panel supports are

Cases are designed as wooden beams with relatively small dimensions measured directly on the plane of the formwork panel in order to provide a high moment of resistance against the formwork panel moving out of its plane. Up to now, the crossbeams have mostly been constructed in which two U-profile beams are welded together back to back using lugs with a mutual distance between them. The profile beams are usually made of rolling profiles, but also of U-shaped bent sheet metal. The space between the webs of the two profile beams can be used to conveniently accommodate coupling pieces for connecting adjacent crossbeams.

The invention is based on the object of making a formwork cross-beam construction available that has a more favorable ratio of weight to load-bearing capacity as well as a more favorable ratio of price to load-bearing capacity than the known formwork cross-beam construction described.

To achieve this object, the invention provides that the profile beam(s) of the formwork cross beam consist(s) of sheet metal which has been bent or folded into the profile shape and which, at least in one flange area, is bent in multiple layers, preferably in two layers, for at least part of the width of the flange area.

The invention therefore provides a formwork cross beam structure made of at least one profile beam, which consists of bent sheet metal with material accumulation through multiple layers in the Berti ·■ -»zw areas that are particularly important for load-bearing. It is therefore possible to work with sheet metal that is thinner than the previous sheet metal profile beams or thinner than the previous rolled profile beams, because the -

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The web of the profile beam - usually a single layer - is only of secondary importance for load-bearing, so that with a given or required load-bearing capacity, a lighter structure is achieved. Sheet metal is easily and inexpensively available in higher strengths than rolled profiles, so that from this point of view - with a given or required load-bearing capacity - a lower weight and a lower price per unit length of the formwork cross beam can be achieved. In addition, there is great freedom in the design of the cross section of the profile beam.

It is not mandatory, but preferred, to construct as large a part of the flange area width as possible in multiple layers in order to benefit from the resulting increase in strength.

It is also preferred for the crossbar profile support designed according to the invention that it has a substantially U-shaped cross-section. The U-shaped profile is particularly easy to manufacture when the profile support is made from sheet metal.

Preferably, the U-profile has a flange area-widening projection on the outside of the web of the U-profile, at least in the multi-layer flange area. This means a further increased accumulation of material in an area that is favorable for the load-bearing capacity. In addition,

You can then easily reach behind the overhang using clamps that serve to connect the crossbar and the formwork panel supports.

The overhang can be formed in a manufacturing-efficient manner by continuing the outer layer of the multi-layer flange area beyond the web of the U-profile.

The invention further relates to a formwork crossbar made of steel for connecting several formwork panel supports, which has a profile support made of bent sheet metal with a first flange area, a second flange area and a web between the two flange areas, characterized in that at least one flange area has a bent extension that projects backwards from the flange area. The extension offers the possibility of reaching around the back with the connecting clamp described and creating a positive fastening there. In addition, two profile supports can be combined in a positive fit to form a crossbar using a suitably designed connecting clamp, so that the previously usual welding of the two profile supports using tabs can be omitted. This represents a significant rationalization of the crossbar production. The provision of the rearward-projecting extension represents, on the one hand, a further development of the invention described above, because this extension can be conveniently produced by bending or folding sheet metal and this goes hand in hand with the multi-layered nature of the corresponding flange area. On the other hand, this measure also has independent inventive content, since it can be implemented without the feature of multi-layeredness of at least one flange area while achieving the above advantages.

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It is particularly advantageous to provide the extension with a rear gripping distance from the web. In this way _, an engagement space, preferably in two directions, is achieved for a corresponding part of the
Connecting clamp. The extension can be designed particularly efficiently by bending the described overhang backwards.

A substantially triangular or trapezoidal design of the sheet metal bend at the free end of the multi-layer flange area with a cavity remaining inside is advantageous. This protects the end edge of the flange area in particular against damage.

In a preferred embodiment of the invention, the
Profile beams have a multi-layer flange area and/or a projection or extension in both flange areas. The most advantageous way to form the profile beam is essentially

symmetrical to a median plane parallel to the two
This not only offers advantages
during production but also during use on the construction site, where there is no need to consider which is the correct mounting position of the crossbar or the profile support of the crossbar.

Although it is possible in principle to use a crossbar according to the invention with only one of the described profile^
beam, it is preferable to use the crossbar with
two profile beams. In this case, you can continue

formation of the invention without a direct connection, in particular tab welding, of the two profile beams. The functional combination of the two profile beams to form a crossbar is then preferably achieved by fastening the two profile beams to the formwork panel beams. A particularly elegant combination can be provided by the clamps, which each grip behind the protrusions or the bent extensions of the two profile beams and behind a flange area of a formwork panel beam. The bent extensions then ensure a positive mutual fixing of the profile beams if the clamps are designed accordingly.

In a preferred embodiment of the invention, the web of the profile beam or the profile beam of the crossbar can be provided with holes. These are used in particular to enable various coupling pieces to be attached, for example flush or angled coupling of two crossbars, attachment of an external corner tension connection for formwork corners, attachment of internal corner support parts, ringing of length compensation pieces and the like. In particular, holes in the middle area of the web and (additional) holes on one side or both sides of the center holes are considered. The holes next to the center holes are preferably provided at those points along the length of the profile beam where there are no center holes, so that the web is weakened at the same points by center holes and side holes. According to a particularly preferred embodiment of the invention, the described rows of holes or rows of holes are provided continuously over the entire length of the respective profile beam. In this way, matt through

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By shortening standardized crossbar lengths , practically any crossbar length that is required can be easily produced. This is particularly effective when the perforations and/or holes are provided in a grid dimension that is an integer fraction of the standardized crossbar lengths. This means that standard lengths can be achieved again by shortening or combining. This is in contrast to the state of the art, where perforations were previously only provided in the end areas of the crossbars and no attention was paid to a grid dimension that was coordinated with standard lengths. The high load-bearing capacity of the crossbars according to the invention makes perforations over the entire length unproblematic.

Finally, the invention relates to a method for producing a profile beam for a formwork cross beam of the type described above, characterized in that the perforations and, if necessary, the holes are punched into a long sheet metal strip, that a section with the length of the profile beam is cut off from the sheet metal strip, preferably by punching, and that the section is bent or folded into the profile shape. This differs in a way that is essential for efficient production from the prior art, in which the perforations and holes were previously punched into the otherwise finished profile beam.

The invention creates a profile beam or a cross beam that can be manufactured industrially for the first time with significantly less effort than before. The perforations and holes are punched directly when a sheet metal strip is unwound from the coil and without taking into account the length of the profile beam that is to be produced. The combination of several profile beams to form a cross beam is carried out in a form-fitting manner, which is particularly efficient.

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and öhiiG gghweißarbeit. The necessary load-bearing capacity is created by multi-layering the bent sheet metal specifically in the crucial surface areas.

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The invention and further developments of the invention are described below using a graphical representation

The example of implementation is explained in more detail. The drawing shows

a perspective view of a section of a concreting formwork with the formwork panel omitted/ where one can see a crossbar made of two combined, continuously perforated sheet metal profile beams and a connecting clamp between the crossbar and an exemplary formwork panel beam made of wood.

In Fig. 1 you can see a formwork panel support 2 made of wood with a double T-profile, which is drawn as an example from a series of parallel supports. The formwork panel ¹ , which is not shown to improve the overview, must be placed against the joint surface of the support 2 shown at the top in Fig. 1 and attached to the parallel supports 2, for example by nailing.

The beams 2 are connected to one another on the side facing away from the formwork panel by several parallel, spaced apart steel crossbars 4, one of which is shown in Fig. 1. The crossbar 4 shown consists of two parallel profile beams 6, which are arranged back to back at a distance from one another. The two profile beams 6 are constructed identically. They each have essentially a U-shaped

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Profile has a first flange area 8 (upper in Fig. ¹ * 1) and a second flange area 10 (lower in Fig. 1) and a web 12 between the two flange areas 8, 10. Each profile support 6 consists of sheet metal with a sheet thickness of a few millimeters. At the transition from the web 12 to the first flange area 6, the sheet metal is bent at a right angle to one side. At the end of the first flange area 6 which is on the side in cross-section, the sheet metal is bent outwards or back by a total of 180°, with a slight bend towards the middle of the web, then a bend upwards parallel to the web and then a right-angled bend back, so that an essentially triangular hollow space is created at the end of the flange area. The outer sheet metal layer of the first flange area 6 formed in the manner described extends a little over the web 12 and is bent briefly downwards at the end parallel to the web 12. It can be seen that in this way a double-layered first flange area 8 and a projection 14 with an extension 15 on the outside of the web 12 facing away from the U are formed. The second splash area 10 and an associated projection Bind are designed in a completely analogous manner, so that the profile carrier 6 is overall symmetrical to a central plane which extends in the middle of the web 6 parallel to the two flange areas 8, :0. The two profile carriers 6 are designed identically and face each other with their web outer sides at a mutual distance.

It can also be seen that a row of holes 16 is provided in the middle of the web 12 along the respective profile beam 6. Each hole 16 is designed as a long hole in the direction of the profile beam length, with the ends of the long holes being trapezoidal. It can also be seen

In each profile beam 6 there is an upper row of holes 18 in Fig. 1 and a lower row of holes 20 in Fig. 1. The holes 18, 20 are round. They are provided between the perforations 16 as one progresses along the respective profile beam. Both the perforations 16 and the holes 18, 20 are arranged in a grid dimension a, measured in the longitudinal direction of the profile beam 6 and from hole center to hole center or from hole center to hole center. The distance a [ between the two rows of holes 18, 20, measured at right angles to the longitudinal direction of the profile beam 6 and from hole center to hole center, is also in accordance with the grid dimension. As a result, for example, right-angled connections between two cross bars 4 with a coupling piece, as is also used for longitudinal connections between two cross bars 4, are easily possible.

It should be emphasized that in the profile beams 6 the perforations 16 and the holes 18, 20 are present over the entire length of the profile beam, of which only a part is visible in Fig. 1, and not only at the ends of the profile beam, and that standard lengths are an integer multiple of the grid dimension a.

Furthermore, Fig. 1 shows a clamp 22 which essentially consists of a base part 24, a screw bolt 26 with nut and a clamping body 28. The base part 24 is made from a strong, trapezoidal sheet metal part by punching and bending. The long base side of this trapezoid is serrated by punching so that it can dig into the back of the lower flange of the support 2 in Fig. 1. The upper end area of this trapezoid is at right angles to the ?

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bent over on the outside. In the lower middle area of this trapezoid, a trapezoidal sheet metal tab is cut free from the sheet metal part on three sides and bent outwards at right angles around the long trapezoid side, parallel to the upper bent sheet metal area. The non-bent sheet metal area rests against the web of the support 2. The two bent sheet metal areas each have a hole. The screw bolt 26 in Fig. 1 leads downwards through the two aligned holes between the two profile supports 6. The clamping body 28 has the shape of a U open at the top with two bent areas 30, each of which fits into the gap between the

( Extension 15 and the web 12 grip and form a form-fitting

create a secure combination of the profile supports 6 with a defined distance. The screw bolt passes through the clamping body 28 through a hole, whereby a screw bolt head (not visible in the drawing) rests against the clamping body 28 from below. When the nut of the screw bolt 26 is tightened from above the base part 24, the clamping body 28 is pulled from below against the projections 14 or the extensions 15 of the two profile supports 6, whereby the first flange areas 8 of the two profile supports 6 are clamped against the lower flange of the support 2 in Fig. 1. The guide of the screw bolt

, 26 through two spaced holes of the base part 24

prevents deformation of the base part under the effect of the clamping force exerted by the nut and tilting of the base part 24.

When viewed in the state attached to the profile supports 6, the clamping body 28 is so short in the longitudinal direction of the profile supports 6 that it - rotated by about 90° around the screw bolt axis - fits between the two profile supports 6. The clamping body 28 can thus be conveniently inserted in the top of the panel 2 between the two profile supports 6, then rotated and then clamped.

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be pulled upwards. The lower head of the screw bolt 26 can have a square which interacts with a square hole in the clamping body 28 or, as shown, with a slot in the clamping body 28 to prevent rotation.

The formwork panel beam 2 shown in Figure 1 is designed as a beam with a continuous web between its two flanges. A special feature of the clamp 22 described is that it has a continuous

\ can attack the web of the beam 2 and not on

the support 2 must be designed as a lattice support. The clamp 22 can, however, also be used with a lattice support 2.

Claims (3)

european &bgr;&ogr;&eacgr;&ngr;&tgr; attorney K 32 122 S/8tö 19.Februar 1988 Dipl.-Ing. Niels Hollmann Niederolana 107b 39030 Olang (Bz) Italy Formwork crossbar made of steel for connecting several formwork slab supports Claims 1. Formwork crossbar (4) made of steel for connecting several formwork panel supports (2), which has two profile supports (6) made of bent sheet metal with a substantially U-shaped profile in cross section, each with a first flange area (8), a second flange area (10) and a web (12) between the two flange areas (8/10), the two profile supports (6) being provided with the web outer sides facing each other and with a distance between the web outer sides, characterized in that the sheet metal of the profile supports (6) is bent in multiple layers at least in one flange area (8; 10) for at least part of the flange area width; and that the U-profiles of the profile supports (6) each have a flange area-widening projection (14) on the outside of the web (12) of the U-profile at least in the multi-layer flange area (8; 10)* 2. Crossbar according to claim 1, characterized in that the overhang (14) from the outer layer of the multi- layered flange area (8; 10). ; . 3. Formwork crossbar (4) made of steel for connecting several formwork panel supports (2), which has a profile support (6) made of bent sheet metal with a first flange region (8), a second flange region (10) and a web (12) between the two flange regions (8, 10), in particular according to claim 1 or 2, characterized in that in at least one flange region (8; 10; 'i) a bent extension (15) is provided, projecting rearwardly from the flange region (8; 10). 4. Crossbar according to claim 3, characterized, that the extension (15) is provided with a rear gripping distance from the web (12). 5. Crossbar according to claim 3 or 4, characterized in that the extension (15) is formed as a bend of the upper part (14). 6. Crossbar according to one of claims 1 to 5, characterized in that the sheet metal bend at the free end of the multi-layer flange area (8; 10) is essentially triangular or trapezoidal in cross-section with a cavity. 7. Crossbar according to one of claims 1 to 0, characterized in that the profile carrier (6) has a multi-layer flange region (8; 10) and preferably an extension (15) in each of the two flange regions (8; 10). &diams; iii B ₄ Crossbar according to claim 7/ characterized by _t . that the profile carrier (6) is essentially symmetrical to a central plane parallel to the two flange areas (8; 10). 9» Crossbar according to one of claims 1 to 8/ characterized by* _a_n _a.i_ i .i _a n^_£ji i.>U-.> / £1 At\m\- &idigr;&ngr;»&ngr;&iacgr;» TlQfcict ietiiner UCtU UXC UCJ-UCIt rtoiiicta^ci 1»! «««-jie«» ««.»·»» &mdash;».-. &mdash;__&mdash; ₇ &mdash;&mdash;-, are combined on the formwork panel supports as cross bars (4). 10. Crossbar according to claim 9, characterized in that the two profile supports (6) are joined together in a form-fitting manner. 11. Crossbar according to one of claims 9 to 10* characterized in that the two profile supports (6) are joined together by clamps (22) which each grip behind the projections (14) or the extensions (15) of the two profile supports (6) and behind a flange area of a formwork panel support (2). 12. Crossbar according to one of claims 1 to 11/ characterized in that the profile carrier(s) (6) in the middle region of the web (12) is/are provided with a row of holes (16) spaced apart at a grid dimension (1a) along its length. 13. Crossbar according to claim 12, characterized in that elongated holes are provided as perforations (16). - 4 14. A locking bolt according to claim 12 or 13/ characterized in that a row of holes (18&iacgr; 2ÖJ) spaced apart at a spacing (a) is provided at least on one side of the row of holes over the length. 15. Crossbar according to claim 14, characterized in ;_i . / &igr;&ogr; . oni Places along the length of the pipe support are provided> which do not have holes (16) in the middle area of the web (12). 16. Crossbar according to one of claims 12 to 15, characterized in that the grid dimension (a) is an integer fraction of the standard crossbar length.