DE3700429A1 - STEEL CROSSBAR LATCH FOR CONNECTING SEVERAL SHEET PANEL CARRIERS - Google Patents

Abstract

The supporting section (6) has a first flange region (8), a second flange region (10) and a web (12) between the two flange regions (8, 10), and a plurality of longitudinally spaced holes are provided respectively in the web (12) in the end regions of the supporting section (6). The supporting section (6) is provided, in the web (12), continuously over the length both with a row of long holes (16), spaced at a grid dimension (a) for receiving a wedge, and, at least on one side of the row of long holes with a row of holes (18; 2) spaced at a grid dimension (a), the grid dimension (a) of the row of long holes and the grid dimension (a) of the at least one row of holes each being essentially an integral fraction of the length of the supporting section.

Description

The invention relates to a formwork crossbar made of steel for connecting several formwork panel beams, one profile carrier with a first flange area, a second flange area and a web between the has two flange regions, being in the end regions of the profile beam in the central area of the web in each case several longitudinally spaced perforations are provided are seen.

There are several types of formwork construction for the Concrete known. One of these types sets comparative instruct large-sized formwork panels, the back are each supported by a plurality of spaced-apart supports, these straps through straps running across them or bars are connected to each other. The crossbars serve on the one hand, several, a common Scha support plate assigned to a dimensionally stable insert connect to each other. On the other hand, they serve the fastening of tension anchors between spaced Formwork panels for shaping the two surfaces delivering, especially wall-like concrete body. And you also usually serve by means of coupling pieces a connection between two adjacent crossbars neighboring formwork panels and their formwork panels To enable carriers, this connection designed so should be that the neighboring formwork panels as possible exactly aligned with each other and merged as closely as possible are tensioned so that no formwork joints with the danger of concrete passing through. In most Cases are essentially the formwork panel beams running vertically or according to a formwork slab inclination provided inclined; but also an essentially horizontal course occurs, ins  especially in the formwork of tunnel structures or the same. The formwork panel beams are in most Cases measured as wooden beams with a relatively large dimension formed perpendicular to the plane of the formwork panel in order a high moment of resistance against deflection of the formwork deliver plate from their level. With the crossbars So far you have mostly encountered a construction method in which two U-profile supports back to back using tabs mutual distance are welded together. The profile Beams usually consist of rolled sections, but also of U-shaped bends a sheet. The space between the webs of the two profile beams can be used for the convenient mounting of coupling pieces for connecting serve adjacent cross bars. The coupling pieces are often with the cross bolt firmly connected that bolts or wedges through holes in the webs of the profile beams and through holes in the Couplings are driven, the distance of the A certain amount of perforations in the coupling pieces on the distance between the perforations in the profile beams can give way to finding suitable positions for Inserting the bolts or wedges facilitated.

So far you only have the end areas of the cross perforated bars. This results from the natural way of thinking that there the coupling pieces for Connection of adjoining cross bars are to be attached and that perforations per se only make sense where they are needed.

The invention has for its object one of the Manufacturing, warehousing and usability cheaper formwork crossbeams at the construction site create.  

To achieve this object, the invention provides that the one or more beams of the formwork crossbar Continuous over the length in the middle area of the web with a number of spaced apart in a grid dimension Perforations is or are.

The invention is therefore initially absurd seeming path, perforations along the entire length of the cross riegel, also between its end areas see, although there is no reason for perforations has seen. The associated increased manufacturing effort for numerous perforations and the associated weakening of the profile beam also between the Both end areas are consciously accepted. Instead which is rated higher according to the invention that he Formwork crossbars according to the invention divided or can be shortened, the crossbar thus generated Fully usable with perforations, especially for attaching are closing of coupling pieces. The production the crossbar is more efficient because it has no back view of the length is simply perforated continuously. In sales, you can rely on very few, standardized ones Limit the lengths of the crossbars. Any needed Intermediate lengths can be shortened in the simplest way sawing off the next longer, standardized length to be provided.

Elongated holes are preferably provided as perforations. This makes in particular the attachment of the coupling pieces easier with wedges.

In a preferred embodiment of the invention, a on one or both sides of the row of perforations for the Length continuously one or two rows of in one  Pitch spaced holes, especially round holes, provided, the pitch of the additional holes matches the pitch of the perforations described men can. The additional holes offer construction site advantages Possibilities of attaching additional parts and accessories equipment, for example attaching an outside corner Train connection at formwork corners, installation from inside Corner support parts, attachment of length compensation pieces, attachment of fixed coupling pieces for permanent more secure connection of two crossbars for creation of larger crossbar lengths, attachment of oblique or Horizontal supports and the like. Here it comes continuous provision of the holes over the entire length the crossbar is particularly noticeable because such attachments anywhere along the crossbar possible are. In the state of the art, one was at suchi tasks often to complicated transition parts or on a comparatively complicated attachment to the Formwork panel beams instructed.

It is particularly favorable if two (additional) holes rows are provided, which are in a Longitudinal spacing corresponding transverse spacing spaced are. As a result of this measure, either aligned Longitudinal connections or right-angled connections between crossbars with high connection stability be put. Also 45 ° inclined connections in the direction the diagonals of a grid square are possible.

The grid dimension of the perforations and / or is preferably Holes an integer fraction of the crossbar standard length, through which one divides or assembles others re can create standard lengths.

The (additional) holes are preferably with their Center in front of those points of the profile beam length seen that there is no perforation in the central area of the web  exhibit. As a result, the shear force transmission ability of the crossbar through the additional holes practically not affected.

In a preferred embodiment of the invention, the cross member (s) of the cross bar consists of sheet metal brought into the profile shape by bending, which is bent at least in one flange area, at least for part of the flange area width, in two layers. This further development therefore starts with the previous method of building the formwork crossbeam from solid rolled profiles and instead provides for a formwork crossbeam structure consisting of at least one profile girder, which consists of bent sheet metal with material accumulation through multilayering in the area or areas that are particularly important for the load bearing. The web of the profile girder, which is only of secondary importance for the load absorption, can be thinner than in the case of conventional formwork crossbeam girders, so that a lighter structure is achieved for a given or required load carrying capacity. It comes as a very essential Lich that sheets are conveniently and inexpensively available in higher strengths than rolled sections, so that even from this point of view - for a given or required load-bearing capacity - a lower weight and a lower price per unit length of the formwork crossbeam can be achieved. In addition, one is free in the shape of the cross-section of the profile beam. The high strength of the crossbar, which can be achieved at low cost, also makes it easy to accept the weakening that is in principle associated with the continuous provision of perforations and possibly holes. The term "double-layered" does not mean that one would be limited to a two-layered sheet in the at least one flange area, although this is preferred. More than two layers are also possible. It is not imperative, but preferred, to make a part of the flange region width that is as large as possible in a manner that is favorable for production, in order to have the greatest advantage of the associated strength increase.

It is also in the profile carrier so developed Crossbar preferred that this in cross section essentially lichen has a U-profile. The U-profile is also at the production of the profile support from sheet metal in particular favorable to manufacture.

The U-profile preferably has at least the dop widen the flange area the supernatant, especially with a bent one extension protruding behind, on the outside of the footbridge of the U-profile, preferably formed from the outer Position of the double-layer flange area. This means a further ge increased material accumulation in one for strength favorable range. You can also use parentheses that each of the connection between the crossbar and the Formwork panel beams, then conveniently behind the Grab the supernatant. The cheapest way is to create the profile carrier essentially symmetrical to a central plane parallel to the two flange areas.

Although it is possible in principle, an inventive one Crossbar with only one of the described beam it is preferable to build the crossbar with two To build profile beams. You can do it without an un indirect connection, especially by Laschenver welding, the two profile beams work. The functio  Fast combination of the two profile beams into one Crossbars then preferably result from the loading the two girders are attached to the formwork plate carriers. A particularly elegant summary can be provided by the brackets behind each the protrusions of the two profile beams and behind one Grab the flange area of a formwork panel girder. Bent extensions of the supernatants can then at ent speaking design of the brackets a positive mutual determination of the profile beams.

Finally, the invention relates to a method for the production of a beam for a formwork crossbar of the type described so far, characterized records that the holes in a long sheet of metal and, if necessary, the holes are punched out by a section with the length of the profile Carrier, preferably by stamping, is separated, and that the section bent or ge in the profile shape is edged. This differs in for the rational Production essentially from the prior art, at to which the perforations and holes were previously in the otherwise fer punched profile carrier.

The invention creates a profile carrier or a cross latch, which with much less effort than before and can be manufactured industrially for the first time. The The holes and holes are punched directly at the Ab winding a sheet metal strip from the coil continuously and without paying attention to the profile beams to be produced length.

The invention and further developments of the invention are explained in more detail below with reference to an embodiment shown in the drawings. The drawing shows
a perspective view of a section of a concrete formwork with Wegge omitted formwork panel, where you can see a crossbar from two summarized, continuously perforated sheet metal girders and a connec tion bracket between the crossbar and an exemplary formwork panel support 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 beams. The formwork panel not shown to increase the overview must be placed against the flange surface of the carrier 2 located in FIG. 1 above and think attached to the parallel beams 2, for example by nailing.

The carrier 2 are connected to one another on the side facing away from the formwork panel by a plurality of parallel, transversely arranged crossbeams 4 made of steel, one of which is shown in FIG. 1. The drawn crossbar 4 consists of two parallel beams 6 , the back to back are spaced apart angeord. The two profiled beams 6 are built identically. They each have upper essentially a U-shaped profile with a in Fig. 1, the first flange 8, a lower end in Fig. 1, the second flange 10 and a web 12 between the two flange portions 8, 10. Each profile carrier 6 consists of sheet metal with a sheet thickness of a few millimeters. At the transition from the web 12 into the first flange area 6 , the sheet is bent at right angles to one side. At the cross-sectional lateral end of the first flange region 6 , the sheet is bent outwards or backwards by a total of 180 °, in particular first a slight bend towards the center of the web, then a bend upwards parallel to the web and then a right-angled bend back are available, so that at the end of the flange there is a substantially triangular cavity ent. The outer sheet-metal layer of the first flange region 6 formed in the manner described goes a little way over the web 12 and is bent briefly downward parallel to the web 12 at the end. It can be seen that in this way a double-layered, first flange area 8 and on the outside of the web 12 facing away from the U a projection 14 with an extension 15 are formed. The second flange region 10 and an overhang assigned to it are designed quite analogously, 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 regions 8 , 10 . The two profiled beams 6 are of identical design and face one another with their web outer sides at a mutual distance.

It can also be seen that a series of perforations 16 is provided in the middle of the web 12 along the respective profile support 6 . Each perforation 16 is designed as an elongated hole in the direction of the profile beam length, the ends of the elongated holes being trapezoidal. Further, an upper in Fig. 1 row of holes 18 and a bottom in FIG. 1 row of holes 20 can be seen in each profile beam 6. The holes 18 , 20 are round. They are, if one proceeds along the respective profile beam, each provided between the perforations 16 . As well as the perforations 16 and the holes 18 , 20 , measured in the longitudinal direction of the profile carrier 6 and from the center of the hole to the center of the hole or from the center of the hole to the center of the hole, are arranged in a grid dimension a . Also between the two rows of holes 18 , 20 is, measured perpendicular to the longitudinal direction of the profile support 6 and from hole center to hole center, the distance a according to the grid dimension. As a result, for example, right-angled connections between two crossbars 4 with a coupling piece, as is also used for longitudinal connections between two crossbars 4 , 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 can be seen in FIG. 1, and not only at the profile-bearing ends, and that standard lengths are present are integer multiples of the grid dimension a .

Also seen in Fig. 1, a bracket 22 , which consists essentially of a base part 24 , a screw bolt 26 with nut and a clamp body 28 . The base part 24 is made from a strong, trapezoidal sheet metal part by punching and bending. The long base of this trapezoid is toothed by punching so that it can dig into the back of the lower flange of the carrier 2 in FIG. 1. The upper end of this trapezoid is bent outwards at right angles. In the lower central 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 trapezoidal side, parallel to the upper bent sheet metal area. The non-bent sheet metal area rests on the web of the carrier 2 . The two bent sheet metal areas each have a hole. Through the two aligned holes, the screw bolt 26 in FIG. 1 leads downward between the two profile supports 6 . The clamping body 28 has the shape of an open U with two order bending areas 30 , each of which engage in the gap between the extension 15 and the web 12 and create a form-fitting summary of the profile carrier 6 with a defined distance. The screw bolt passes through the clamping body 28 through a hole, a screw bolt head (not shown in the drawing) abutting against the clamping body 28 from below. If 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 stands 14 or the extensions 15 of the two profile supports 6 , the first flange regions 8 of the two profile supports 6 against the one shown in FIG be clamped. 1 lower flange of the carrier 2. The guidance of the screw bolt 26 through two spaced holes in 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 .

The clamping body 28 is, if you consider the attached to the profile beams 6 state, in the longitudinal direction of the profile carrier 6 so short that it - rotated by about 90 ° about the bolt axis - between the two profile carriers 6 passes. Thus, the clamping body 28 can be conveniently introduced in Fig. 2 from above between the two profile carrier 6 , then rotated and then pulled upwards in a clamping manner. The lower head of the screw bolt 26 may have a square, which cooperates with a four square hole of the clamping body 28 or, as drawn, with a slot of the clamping body 28 to prevent rotation.

The formwork panel support 2 shown in FIG. 1 is designed as a support with a continuous web between its two flanges. It is a special feature of the clamp 22 described that it can attack next to a continuous web of the carrier 2 and does not rely on the carrier 2 being designed as a lattice carrier. However, the bracket 22 can also be used in a lattice girder 2 .

Claims (11)

1. formwork crossbar ( 4 ) made of steel for connecting a plurality of formwork panel beams ( 2 ), the profile beam ( 6 ) with a first flange area ( 8 ), a second flange area ( 10 ) and a web ( 12 ) between the two flange areas ( 8 , 10 ), in the end regions of the profile carrier ( 6 ) in the central region of the web ( 12 ) a plurality of perforations ( 16 ) spaced in the longitudinal direction are provided, characterized in that the profile carrier ( 6 ) in the central region of the web ( 12 ) is continuously provided over the length with a series of perforations ( 16 ) spaced apart in a grid dimension ( a ). 2. Crossbar according to claim 1, characterized in that elongated holes are provided as perforations ( 16 ). 3. Crossbar according to claim 1 or 2, characterized in that at least on one side of the row of perforations over the length a row of holes ( 18 ; 20 ) spaced apart in a pitch ( a ) is provided. 4. Cross-piece according to claim 3, characterized in that two rows of holes are provided which are spaced apart in a the longitudinal spacing (a) corresponding cross-grid spacing (a). 5. Crossbar according to one of claims 1 to 4, characterized in that the grid dimension ( a ) is an integer fraction of the crossbar standard length. 6. Crossbar according to one of claims 3 to 5, characterized in that the holes ( 18 ; 20 ) are provided with their center at those points of the profile beam length that have no perforations ( 16 ) in the central region of the web ( 12 ). 7. Crossbar according to one of claims 1 to 6, characterized in that the profile carrier ( 6 ) consists of sheet metal brought into shape by bending into the profile, which is bent at least in one flange region ( 8 ; 10 ) at least for a portion of the flange multi-layer area , preferably dop pellagig, is. 8. Crossbar according to claim 7, characterized in that the profile carrier ( 6 ) has a U-profile in cross section substantially. 9. Crossbar according to claim 8, characterized in that the U-profile at least in the multi-layer flange area ( 8 ; 10 ) was a flange area-widening over ( 14 ) with a bent, projecting rearward extension ( 15 ) on the outside of the web ( 12 ) of the U-Pro fils, preferably formed from the outer layer of the double-layer flange region ( 8 ; 10 ). 10. Crossbar according to one of claims 1 to 9, characterized in that it has two profile carriers ( 6 ) which face each other with the web outside and are provided at a distance between the web outside. 11. A method for producing a profile beam ( 6 ) for a formwork crossbar ( 4 ) according to one of claims 1 to 10, characterized in that the perforations ( 16 ) and optionally the holes ( 18 ; 20 ) are punched in a long sheet metal strip that a section with the length of the profile support ( 6 ) is cut off from the sheet metal strip, and that the section is bent into the profile shape.