Formwork panel for concrete construction

Abstract

Formwork panel (1) for concrete construction, with a preferably rectangular metal frame (10) comprising a number of frame profiles (11, 12) on which a formwork skin (13) is received, wherein at least one cross bar (14) is arranged between the frame profiles (11, 12), characterized in that the cross bar (14) has a profile cross section with a closed profile box (15) and with a profile web (16) projecting from the profile box (15).

Description

The invention relates to a formwork panel for concrete construction, having a preferably rectangular metal frame comprising a number of frame profiles on which a formwork skin is accommodated, wherein at least one cross bar is set up between the frame profiles.PRIOR ARTA formwork panel of the type of interest here is known, for example, from DE 41 22 173 A1. The formwork panel serves as part of a formwork for concrete construction, in particular for concrete ceilings, and has a rectangular metal frame which is formed by a plurality of frame profiles, in particular longitudinal profiles and transverse profiles. The frame thus formed is further stiffened by inwardly extending transverse bars which extend parallel to the transverse profiles, in particular equidistantly, and are arranged between the outer longitudinal profiles. The cross bars have a Z-profile cross section, so that they can be produced by the punching-bending process. The cross bars are made of steel sheet and can at best be reduced in weight by reducing the material, such as by means of the holes shown.Formwork panels are generally mounted overhead by hand and, for example, removed from a stack and fed to the formwork construction, so that it is desirable to make formwork panels for concrete construction with the lowest possible weight, but these should nevertheless have a high strength and, during subsequent concrete casting, can also carry greater concrete fill heights for correspondingly greater ceiling thicknesses. In this respect, there is the object of constructing formwork panels with a low own weight which can nevertheless carry high loads.DISCLOSURE OF THE INVENTIONThe object of the invention is to further improve a formwork panel for concrete construction, in that the formwork panel is intended to undergo a further weight reduction, while, however, the load-bearing capacity of the formwork panel for formwork construction or concrete casting is intended to be maintained as far as possible or increased with the same weight.This object is achieved on the basis of a formwork panel according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous further developments of the invention are specified in the dependent claims.The invention includes the technical teaching that the cross bar has a profile cross section with a closed profile box and with a profile web projecting from the profile box.The core idea of the invention is a profile cross section of the crossbar that is suitable for absorbing particularly high line loads, wherein the crossbar nevertheless has a low weight. The crossbar can be produced from a steel sheet in that the profile box is produced by bending operations and subsequent longitudinal welding, but it is preferably provided that the crossbar, as well as in particular the frame profiles of the metal frame, is produced from aluminum. The profile cross section can thus be produced seamless and materially uniform, so that the profile cross section of the profile box merges integrally, materially uniform and in particular without interruption into the protruding profile web. Profiles of this type can be produced in particular from aluminum using an extrusion process, in that a die is used which forms the entire profile cross section without interruption and the crossbar can be produced with a finished profile cross section.By integrating a profile box in the profile cross section of the cross bar in such a way that the profile box consequently forms a profile section of the cross bar, a surface moment of inertia can be generated which can be used in such a way that the cross bar can bear particularly high track loads from the side facing away from the profile box. This means that, in particular when the profile box is arranged in the profile cross section on a side facing away from the formwork skin, the area moment of inertia can be increased with the greater cross-sectional proportion in the profile box and a deflection of the cross bar can be reduced by the particular stiffening. As a result, the load carrying capacity of the crossbar and hence of the formwork panel increases, while a low weight can nevertheless be realized.For example, an AW-6082 T5 (Al Si1MgMn) can be used as the aluminum material for the crossbar, but also for the frame profiles of the metal frame according to the EN, alternatively an AW-6082 T6 (Al Mg1SiCu). The crossbar of interest here can have a weight of about 1 kg / m, for example, and the entire formwork panel can have a total weight of only about 34 kg with a panel size of 1,800 mm x 1,200 mm, wherein the weight proportion of the metal frame is about half the total weight.With respect to the profile cross section considered two-dimensionally, the profile web projects laterally from the profile box, resulting in an overall cross section of the transverse bar which is not formed merely from the profile box itself. Rather, the profile box forms only a portion of the entire profile cross section, wherein the further portion is formed by the profile web which laterally protrudes from the profile box. The free end of the profiled web can advantageously have a support lug projecting perpendicularly therefrom. The cross bar is integrated into the metal frame in such a way that the support tab protruding laterally or perpendicularly from the profiled web supports the formwork skin on the underside, so that the formwork skin abuts the outer side of the support tab, while the profiled web extends perpendicularly to the formwork skin.The support lug forms an upper end of the profile cross section abutting against the underside of the formwork skin, wherein the opposite our end is formed by the profile box. Due to the particularly large distance of the profile box from the formwork skin, a particularly high load-bearing capacity of the crossbar is achieved, since the moment of area inertia is particularly high in this load direction present here.The closed profile box forms a rectangular profile, wherein the profile web merges without interruption into the closed profile box at a corner of the rectangular profile. The profiled web thus has a web section with respect to the profile cross section, and the support lug protrudes perpendicularly from the web section. The web section, which forms a surface section between the support lug and the profile box with respect to the elongated transverse latch, defines a plane in which an outer side of the profile box is also located, so that the web section of the profile web merges without interruption into an outer side surface of the profile box. The closed profile box has two parallel longitudinal sections and two parallel transverse sections, which form the rectangular profile, and in this respect the web section of the profile web can form a common plane with one of the longitudinal sections. In particular, the profile box can form in its cross section an elongate rectangle, in which the longitudinal section of the profile box forms the elongate edge, and the web section of the profile web consequently also merges into the elongate edge. The transverse sections of the profile box are consequently perpendicular to the longitudinal sections and thus also perpendicular to the web section of the profile web. However, the support lug runs parallel to the transverse sections of the profile box. The support lug projects on the same side from the web section of the profile web as does the profile box.To further optimize the weight of the cross bar, it can be provided that the web width of the profile box is thinner than the web width of the profile web with the web section and / or is thinner than the support lug. The web width describes the material thickness or material thickness of the web section, of the support lug or of the transverse sections and longitudinal sections of the profile box.The cross bar with the closed profile box and with the profile web comprising the web section and the support lug consequently forms a materially uniform, seamless and / or uninterrupted extruded profile made of aluminum. It is not preferred, but nevertheless alternatively conceivable, to design the crossbar from a steel sheet, which is produced via punching-bending operations and in particular a weld seam, in order to produce the same cross section as in the manner described above for the aluminum extruded profile.The metal frame preferably consists of four frame profiles, wherein two frame profiles run parallel to the transverse bars and two further, longer frame profiles run transverse to the transverse bars. The frame profiles running parallel to the transverse bars can have an upper profile box, i.e. facing the formwork skin, which the formwork skin adjoins. On the other hand, the two frame profiles of the metal frame running transversely to the transverse bars can have a lower profile box which is arranged at a distance from the formwork skin, wherein the transverse bars are welded to the frame profiles with their end sides by means of welded seams. The consequently alternating arrangement of the profile boxes of the frame profiles with the profile boxes as a component of the cross bars results in a high overall rigidity of the metal frame. The main dimensions of the metal frame and / or the formwork skin can be, for example, 1800 mm above the longitudinal side and 1200 mm above the transverse side, wherein the height of the metal frame can be 141.5 mm. The cross bars thus extend transversely in the metal frame and may have a length of about 1200 mm minus the built-up thickness of the longitudinally extending frame profiles extending transversely to the cross bars. The formwork panel can alternatively also have a trapezoidal shape or a triangular shape, so that the metal frame is constructed from frame profiles which do not merely consist of two different lengths. The cross bars can also be integrated within the trapezoidal or triangular metal frame.The height of the cross bars can be less than the height of the frame profiles of the metal frame. If the formwork panel is placed on a support, the cross bars do not touch the support. For example, the transverse bars can have a height of 105 mm to 120 mm and / or of 150 mm to 110 mm and preferably of 112 mm, while the metal frame has a structural height of 141.5 mm.PREFERRED EMBODIMENT OF THE INVENTIONFurther measures which improve the invention are described in more detail below together with the description of a preferred exemplary embodiment of the invention on the basis of the figures. It shows: FIG. 1 shows a side view (top) and a top view (bottom) of the formwork panel, FIG. 2 is a perspective view of the formwork panel, FIG. 3 shows a view of the profile cross section of the crossbar in an individual view, FIG. 4 is a view of the cross-sectional profile of the crossbar arranged on a rear frame profile, showing the welds, FIG. 5 is a view of the frame profile of the metal frame which forms the longer side of the formwork panel and runs transversely to the cross bars; and FIG. 6 is a view of the frame profile of the metal frame forming the shorter side of the formwork panel and running parallel to the cross bars.FIG. 1 shows a side view at the top and a top view of the formwork panel 1. the formwork panel 1 has a metal frame 10 and a formwork skin 13, wherein the formwork skin 13 is accommodated on the top on or on the metal frame 10 and fastened to the latter. The metal frame 10 has a rectangular shape with an elongate extent and has frame profiles 11 which run in the shorter direction, and further frame profiles 12 run in the elongate direction and are correspondingly longer than the transversely running frame profiles 11. The frame profiles 12 have openings 19 which, in addition to a technical function, also make possible a further saving in weight. The formwork skin 13 is detachably fastened on the top side on the metal frame 10 and also on the cross bars 14 by fastening points 20.FIG. 2 shows a perspective view of the metal frame 10 with the shorter frame profiles 11 in the transverse direction and with the longer frame profiles 12 in the longitudinal direction, and the transverse latches 14 are inserted between the transversely extending shorter frame profiles 11. The transverse bars 14 are welded via their end sides on the inside to the longitudinally running frame profiles 12 by means of welded seams 18.The formwork panel 1 illustrated by way of example has main dimensions of 1800 mm to 1200 mm, and formwork panels 1 having a different size can also have a different number of transverse bars 14.FIG. 3 shows the profile cross section of the cross bar 14 with the closed profile box 15 and with the profile web 16 projecting from the profile box 15. the profile web 16 is substantially formed by a web section 16 a, and on the side facing away from the profile box 15 a laterally projecting support lug 17 is formed on the free end of the web section 16 a. The support lug 17 serves for supporting the formwork skin and extends away from the profiled web 16 on the same side as the profiled box 15. the profiled box 15 is provided with a rectangular shape and is formed by two longitudinal sections 15 aand two transverse sections 15 b, wherein the two longitudinal sections 15 arun parallel to the profiled web 16, while the transverse sections 15 brun perpendicular to the profiled web 16 a. The rear transverse section 15 bof the profile box 15 has a plane of extent which merges with the plane of extent of the web section 16 aof the profile web 16. The web width of the profiled web 16 with the support lug 17 is greater than the web width of the profiled box 15 with the longitudinal sections 15 aand the transverse sections 15 b. For example, the profiled web 16 has a web width of 2.3 mm and the supporting lug 17 has 2.5 mm, while the longitudinal sections 15 aand transverse sections 15 bof the profiled box 15 have only a web width of 1.8 mm. The crossbar 14 can have a total height of 112 mm, wherein the height direction is defined by the plane of extension of the profile web 16. The longitudinal sections 15 aof the profile box 15 can have a length of 27.5 mm and the transverse sections 15 bof the profile box 15 can have a length of 18 mm. In this respect, the support lug 17 can also have a length of 18 mm, with which the support lug 17 protrudes perpendicularly and thus in an L-shaped manner from the profiled web 16. The entire cross-sectional area of the crossbar 14 can form 380 mm 2 for example. The weight of the cross bar 14 can be 1.03 kg / m, for example.Finally, FIG. 4 shows the cross bar 14 arranged on the frame profile 12, wherein the cross bar 14 is welded to the frame profile 12 by means of weld seams 18 with the end sides. On the upper side, the formwork skin 13 rests on the frame profile 12 and at the same time also rests on the outer side of the support lug 17. The arrangement of the cross bar 14 makes it clear that the profile box 15 is arranged on the side facing away from the formwork skin 13, so that a high area moment of inertia results due to the higher specific material cross-sectional proportion of the profile box 15, so that a particularly high load capacity can be supported on the formwork skin 13.FIG. 5 shows a profile cross section of the frame profile 12 which, as a component of the metal frame of the formwork panel, runs longitudinally and in this respect has the greater length. The opening 19 can be seen in the profile cross section of the frame profile 12 and, on the top side, the frame profile 12 has a receptacle 21 for the formwork skin 13. On the lower side facing away from the receptacle 21, the frame profile 12 has a lower profile box 12 a,as a result of which the area moment of inertia of the profile is likewise increased such that a particularly high load can act on the receptacle 21. The lower profile box 12a has web widths which are considerably greater than the web width of an intermediate piece 22, and the intermediate piece merges into the receptacle 21, which in turn has greater web widths. This material and thickness distribution of the longitudinally extending frame profile 12 achieves a high rigidity of the formwork panel, so that the latter can also be subjected to a large concrete load.Finally, FIG. 6 shows the profile cross section of the frame profile 11 which runs transversely parallel to the transverse bars and thus defines the shorter side of the formwork panel. The frame profile 11 has an upper profile box 11 a, on top of which a receptacle 21 for the formwork skin is again configured. On the underside, the frame profile 11 has an approximately L-shaped extension 23, the web width of the L-shaped extension 23 and of the receptacle 21 again being greater than the web width of the upper profile box 11 a.The geometry of the crossbar designed according to the invention, in particular in conjunction with the above-described profile cross sections of the frame profiles 11 and 12 of the metal frame 10, produces a formwork panel 1 with a high rigidity, a high load capacity, while still being light weight.The embodiment of the invention is not limited to the preferred exemplary embodiment given above. Rather, a number of variants are conceivable which make use of the solution shown even in fundamentally different embodiments. All features and / or advantages arising from the claims, the description or the drawings, including structural details or spatial arrangements, can be essential to the invention both individually and in a wide variety of combinations.List of reference numbers:1 Formwork panel 10 Metal frame 11 Frame profile (transverse) 11 a Oberer profile box 12 Frame profile (longitudinal) 12 a Unterer profile box 13 Formwork skin 14 Transverse latch 15 Profile box 15 a Längs section 15 b Quer section 16 Profil web 16 a Steg section 17 Support lug 18 Weld seam 19 Opening 20 Fastening point 21 Receptacle 22 Intermediate piece 23 L-shaped extensionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 41 22 173 A1

[0002]

Claims

Formwork panel (1) for concrete construction, having a preferably rectangular metal frame (10) comprising a number of frame profiles (11, 12) on which a formwork skin (13) is accommodated, wherein at least one cross bar (14) is configured between the frame profiles (11, 12), characterized in that the cross bar (14) has a profile cross section with a closed profile box (15) and with a profile web (16) protruding from the profile box (15).Formwork panel (1) according to claim 1, characterised in that the free end of the profiled web (16) has a support lug (17) which projects perpendicularly from the profiled web (16) and against which the formwork skin (13) bears.Formwork panel (1) according to claim 1 or 2, characterised in that the closed profile box (15) forms the end of the profile cross-section of the cross-bar (14) opposite the support lug (17).Formwork panel (1) according to one of claims 1 to 3, characterised in that the closed profiled box (15) forms a rectangular profile, wherein the profiled web (16) merges without interruption into the closed profiled box (15) at a corner of the rectangular profile.Formwork panel (1) according to one of the preceding claims, characterized in that the closed profiled box (15) has two parallel longitudinal sections (15a) and two parallel transverse sections (15b) which form the rectangular profile, and / or wherein the profiled web (16) has a web section (16a) which extends in a common plane with one of the longitudinal sections (15a).Formwork panel (1) according to one of the preceding claims, characterized in that the support lug (17) projects from the web section (16a) on the same side as does the profile box (15).Formwork panel (1) according to one of the preceding claims, characterized in that the web width of the profile box (15) is thinner than the web width of the profile web (16) with the web section (16a) and / or is thinner than the support lug (17).Formwork panel (1) according to one of the preceding claims, characterized in that the cross bar (14) forms, with the closed profile box (15) and with the profile web (16), a materially uniform, seamless uninterrupted extruded profile made of aluminium.Formwork panel (1) according to one of the preceding claims, characterized in that two frame profiles (11) of the metal frame (10) running parallel to the transverse bars (14) have an upper profile box (11a), which is adjoined by the formwork skin (13).Formwork panel (1) according to one of the preceding claims, characterized in that two frame profiles (12) of the metal frame (10) running transversely to the transverse bars (14) have a lower profile box (12a), which is arranged at a distance from the formwork skin (13), wherein the transverse bars (14) are welded to the frame profiles (12) by means of welding seams (18) with their end sides.Formwork panel (1) according to one of the preceding claims, characterized in that the main dimensions of the metal frame (10) and / or the formwork skin (13) are 1800 mm above the longitudinal side and 1200 mm above the transverse side and / or wherein the height of the metal frame (10) is 141.5 mm.Formwork panel (1) according to one of the preceding claims, characterized in that the height of the cross bars (14) is less than the height of the metal frame (10) and / or that the height of the cross bars (14) has a value of 105 mm to 120 mm and / or of 115 mm to 110 mm and / or of 112 mm.

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