Grating

Abstract

Grating (1) comprising a plurality of first struts, designated as load-bearing bars (3), each of which is designed as a flat bar with two opposing flat sides (30), and a multitude of second struts, called crossbars (5), crossing the first struts, characterized by that the first struts form a first support position (33), and that at least on one of the flat sides (31) a second support layer (35) is formed, which is preferably connected to the first support layer (33).

Description

[0001] The invention relates to a grating according to the features of the preamble of claim 1.

[0002] Grating systems are known in various forms from the prior art. Basically, grating systems comprise a multitude of primary and secondary struts, which are arranged intersecting each other and are referred to as bearing and crossbars, respectively, and optionally an edge trim.

[0003] A particularly high load-bearing capacity is a typical characteristic of such gratings, making them suitable for use in various applications, especially for covering building openings, for example as shaft, floor, parapet, stair, or facade elements. Gratings are also commonly used as components in racking systems. Additional panels on the top and / or underside can improve grating properties, such as load-bearing capacity or slip resistance. These panels also prevent objects from unintentionally passing through the grating openings, which may be necessary for hygiene reasons, for example, in the food processing industry.

[0004] The load-bearing bars are regularly aligned parallel to each other and designed as flat material or as flat bars with two opposing flat sides. When installed as a shaft, (shelf) floor, or stair element, and with a corresponding predominantly horizontal arrangement of the grating, the load-bearing bars also run horizontally, but with the cross-sectional profile of the flat material oriented vertically, so that the two opposing flat sides are oriented laterally and the narrow edges face upwards or downwards. When installed as a parapet or facade element, and with a corresponding predominantly vertical arrangement of the grating, the load-bearing bars run, for example, horizontally with a horizontal cross-sectional profile or vertically with a vertical cross-sectional profile.

[0005] The crossbars intersecting the load-bearing bars are designed as rods or flat material. In the previously mentioned installation situation, the crossbars also run horizontally.

[0006] A welded press-fit grating is a type of grating in which, for example, twisted square material is bonded to the bearing bars by means of crossbars, with the crossbars being pressed into openings or passages in the bearing bars. A second type of grating is called a press-fit grating. In this case, the crossbars also consist of flat material, but with smaller or the same cross-sectional dimensions as the bearing bars. The bearing bars are opened at regular intervals, in particular by slots, with the passages aligned. The crossbars are inserted into these openings and pressed into place with the bearing bars without any welding or similar process.

[0007] DE 18 17 660 A1 and WO 97 / 43 500 A1 describe load-bearing bars with a substantially I-shaped cross-sectional profile, which are connected to each other via transverse bars. DE 20 2013 103 144 U1 describes load-bearing bars with a constriction or waist in the region of the neutral axis. For the production of the aforementioned load-bearing bar cross-sectional profiles, for example, aluminum load-bearing bars are extruded accordingly, steel or stainless steel load-bearing bars are rolled accordingly, and load-bearing bars made of fiber-reinforced plastic are, for example, pultrified accordingly.

[0008] The cross-sectional profile of the load-bearing bars of the aforementioned types, which deviates from the general rectangular profile, is based, among other things, on the consideration of creating load-bearing bars with a reduced amount of material, thus reducing weight and costs without having to worry about losses in load-bearing capacity or the like.

[0009] Although weight reductions of approximately 20% can be achieved, the production of the described cross-sectional geometries is complex and costly. For example, cold rolling requires very high machine investments and energy costs. The cost reduction associated with material savings is therefore essentially offset by the high machine costs, thus negating a particularly economically advantageous design for the load-bearing bars.

[0010] The present invention is based on the objective of providing a particularly load-bearing and weight-reduced grating that can be manufactured in an economically advantageous manner.

[0011] The problem is solved by a grating according to the features of claim 1. Further advantageous aspects, details and embodiments of the invention will become apparent from the dependent claims and from the description.

[0012] According to a first aspect, the presented invention relates to a grating comprising a plurality of first struts, each designed as a flat bar with two opposing flat sides, which are preferably referred to as bearing bars. Essentially orthogonal to the flat sides, each strut preferably has two opposing narrow edges or sides. A plurality of second struts, referred to as crossbars, intersect the first struts. A number or all of the first struts form a first support layer. A second support layer is formed on at least one of the flat sides, the second support layer preferably being connected to the first support layer. For example, the second support layer is attached to the first support layer by means of (spot) welding. In particular, adhesive bonding can connect the first and second support layers. Preferably, a number of struts form second support layers, which are, for example, made of flat material or...Each support is designed as a flat bar with two opposing flat sides. One flat side of a second support layer is preferably oriented towards a flat side of a first support layer.

[0013] In other words, the invention proposes modifying the cross-sectional profile of a support bar such that relatively more material is arranged in highly stressed zones of the tensile and / or compressive phase of the support bar, and relatively less material is arranged in a neutral zone, that is, essentially in a central zone of the support bar. First and second support layers, preferably in the tensile and / or compressive zone of several support bars, are suitable for reinforcing a grating. The increased load-bearing capacity, for example, does not, however, result in increased material usage, since material for a reinforcement layer is not provided, particularly in the neutral zone. Initial, non-public tests have shown that gratings according to the invention have a comparable load-bearing capacity to known gratings, with the material usage of the gratings according to the invention being reduced by 20% compared to known gratings.As will be explained later, the aforementioned advantages do not require a complex manufacturing process.

[0014] The bearing bars and / or crossbars are preferably designed as flat material and are made of a metallic material. For example, sheet metal strips can form the first and / or second struts. For weather protection, the grating or the components of a grating, such as the first and second struts and / or an edge trim, are preferably coated, especially galvanized.

[0015] In the context of the presented invention, "number" means a singular or plural feature.

[0016] The grating according to the invention can preferably be further developed by the features and technical aspects set out below - individually or in combination with each other.

[0017] The second set of struts intersects the first set of struts at regular intervals in an upper section, where the load-bearing members form a compression zone under load. Separated by a neutral zone, the load-bearing members exhibit a tension zone in their lower section under load. If the load-bearing capacity in the tension and compression zones is equal, the neutral zone is located essentially in the center of the load-bearing member's cross-sectional profile. The lower the compressive strength, the more the neutral zone shifts towards the compression zone, and vice versa. The upper section of a load-bearing member is bounded by a first narrow edge, and the lower section by a second narrow edge.

[0018] According to a preferred embodiment, second struts intersect first struts in each intersection area. A second support layer is advantageously arranged between two intersection areas. The arrangement of at least one second support layer between two intersection areas increases the load-bearing capacity of the grating in the compression zone. For the purposes of the invention, the upper region comprises the upper 40% of the cross-sectional profile of a bearing bar in a grating, and the lower region comprises the lower 40% of the cross-sectional profile of a bearing bar in a grating. Preferably, second support layers are arranged in the upper 30% and / or in the lower 30%, and particularly preferably in the upper 20% and / or lower 20%.

[0019] Preferably, a first and a second support layer are positioned adjacent to each other, with the first and second support layers either partially abutting each other or with the flat side of the first support layer resting against the flat side of the second support layer over a substantially full surface. Adjacent support layers have the advantage of requiring little installation space, allowing, for example, a larger number of load-bearing bars to be arranged in the same installation space.

[0020] In principle, several components preferably form the first and second support layers, in particular several flat materials or flat bars, which are connected to each other by means of welding, gluing, clinching, riveting and / or screwing or similar methods.

[0021] A particularly advantageous development features a first and second support layer that is essentially formed in one piece. Specifically, the cross-sectional profile of, for example, a flat strut is pre-formed using a forming process or by folding the first strut, such that a first and at least one second support layer are formed. For example, between 30 and 60% of the cross-sectional profile of a load-bearing bar can be formed once or multiple times to create the first support layer and the number of second support layers. Forming provides a comparatively simple and cost-effective method for manufacturing the second support layers.

[0022] Regardless of whether the first and second support layers are designed as single pieces or in multiple pieces, they are preferably arranged relative to each other in such a way that at least in sections, a substantially U-, C-, O-, T-, and / or arrow-shaped cross-sectional profile is formed. These cross-sectional profiles are particularly suitable for achieving, for example, a desired area moment of inertia, especially depending on the load acting on the grating during use.

[0023] Preferably, transverse bars run perpendicular to the load-bearing bars, and preferably, second support layers run longitudinally essentially parallel to the first support layers. In a further development, it is preferably provided that a second support layer is oriented at an angle to the first support layer, in particular such that the flat sides of the first and second support layers facing each other are oriented at an angle to one another. The resulting opening angle is, for example, between 1 and 179°, preferably between 1 and 90°.

[0024] The aforementioned intersection between first and second struts, particularly between the load-bearing member and the crossbar, is designed, for example, such that a crossbar rests on the narrow edge of a load-bearing member and is permanently connected to it. Preferably, first struts have a number of openings, particularly aligned openings. Preferably, second struts extend through these openings.

[0025] In a particularly preferred embodiment, a number of openings terminate in the narrow edges of the first struts or support bars, especially in the upper narrow edge. The second struts are held in the openings, for example by means of a welded joint to form a welded press-fit grating or by means of a positive and / or force-fit to form a press-fit grating.

[0026] According to a further development, first struts preferably have a plurality of second support layers. For example, a first strut has second support layers in its upper and lower regions, that is, particularly in the region of the upper and lower narrow edges of a bearing bar. Furthermore, second support layers are preferably formed on both flat sides of a bearing bar. In particular, a mirror-symmetrical design of a bearing bar reduces the manufacturing costs of a grating because the complex alignment of a bearing bar before its installation can be disregarded.

[0027] In one embodiment, it is provided that preferably first struts have at least one fold, that is, a step, an edge, or a fold. The fold preferably forms a joint, groove, or step. By preferably forming the fold adjacent to a second support layer, and thus preferably limiting the width of a support layer, a receiving space is created, for example, in which the second support layer is arranged. Furthermore, the fold is particularly designed such that a plane of the neutral zone of a support bar is arranged between a first and second support layer.

[0028] Preferably, first struts are designed as parallel load-bearing bars and second struts are designed as parallel crossbars.

[0029] Preferably, an edge frame forms an edge termination of a grating, with the first and / or second struts connecting to the end face of the edge frame. Furthermore, second struts in particular have a substantially circular cross-sectional profile, e.g., in the form of a twisted square material.

[0030] A top and / or bottom panel is preferably attached to the grating. The panels essentially close off the surfaces, thus preventing objects from unintentionally passing through the grating openings, for example, during installation. In particular, the panels have a coating and / or a number of structures that increase the slip resistance of the grating. These structures include, for example, protruding teeth, projections, ledges, or similar features. Furthermore, the support bars according to the invention offer a comparatively large bearing surface for attaching a panel.

[0031] A preferred method for manufacturing a grating is presented below. For this purpose, a plurality of first and second struts are provided, which are aligned and connected to each other, in particular such that the first and second struts intersect. The first struts are preferably each designed as flat bars with two opposing flat sides, and each first strut forms a first support layer. Furthermore, first struts with a number of second support layers are provided, wherein a number of second support layers are formed on at least one of the flat sides.

[0032] Preferably, the grating produced by the method has a number of the features described above or a number of the features according to claims 1 to 11.

[0033] According to a particularly preferred embodiment, at least a second support layer is created by reshaping the first strut. Alternatively or additionally, for example, a second structural element creating a second support layer is connected to a first strut. For example, a flat material or similar, in particular a bleaching strip or the like, is connected to a first strut, preferably by welding, bonding, clinching, riveting and / or bolting, or similar methods.

[0034] Due to the simple and cost-effective process, forming the first strut is particularly advantageous. As explained previously, during forming, the cross-sectional profile of, for example, a flat strut is pre-shaped in such a way that a first and a second support layer are formed. For example, between 30 and 60% of the cross-sectional profile of a load-bearing bar can be formed once or multiple times to create the first support layer and a number of second support layers.

[0035] A particularly preferred method enhancement involves multiple forming processes for the first struts, such that they exhibit a multitude of second support layers. This multiple forming processes create a number of edges and / or surfaces that significantly contribute to improving the area moment of inertia of a first strut or support bar as required.

[0036] According to one embodiment of the manufacturing process, preferably 30 to 60% of the cross-sectional profile of a first strut is reshaped to form a number of second support layers. Initial, non-public tests have shown that, in particular, reshaping 50% of the cross-sectional profile of a first strut provides various degrees of freedom for forming a number of desired second support layers. For example, a first strut, designed as flat material, can have a width of approximately 40 mm. With a 50% reshaping, 20 mm of the first strut are reshaped, with the remaining 20 mm forming a first support layer in which, for example, the neutral zone is located.

[0037] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the purely schematic drawings, whereby individual features or a combination of features of the illustrated exemplary embodiments may also be realized independently of the other configuration. The following are shown: Fig. 1-6 Exemplary embodiments of bearing bars in perspective view (a) and exemplary embodiments of gratings with the possible bearing bar according to (a) in cross-sectional view (b) and in perspective views with enlarged detail views (c and d), and Fig. 7. A process example for the production of a grating.

[0038] Fig. Figure 1a shows a first embodiment of a support bar 3 or a first strut in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece. By forming 112 by approximately 180°, two second support layers 35 are formed on one flat side 31, wherein the flat side 31 of the second support layer 35 and the flat side 31 of the first support layer 33 or of the support bar 3 abut each other substantially over a support layer width B. As a result of the forming 112, the narrow edges 15 are now oriented towards each other. The first and second support layers 33, 35 are aligned parallel to each other and connected to each other via a radius 37. Furthermore, the support rod 3 is designed in a mirror-symmetrical manner with respect to a mirror plane S, which is aligned perpendicular to the flat sides 31.

[0039] The width of the support bar 3 before forming 112 is approximately 60 mm, of which 20 mm are formed (10 mm on each narrow edge). The support layer width B is 10 mm, and the free section F of the support bar 3 between the two second support layers 35 is 20 mm.

[0040] A cross-section of an exemplary grating 1 with a plurality of bearing bars 3 according to the first embodiment is shown. Fig. 1b. The load-bearing bars 3 are oriented such that their flat sides 31 and the second support layers 35 point in the same direction. Crossbars 5 intersect the load-bearing bars 3 in respective intersection fields 7, the width B of the support layers essentially corresponding to the upright cross-sectional profile of the crossbars 5. Furthermore, the end faces 13 of the crossbars 5 abut an edge restraint 11.

[0041] The grating 1 made of Fig. 1b shows Fig. Figure 1c shows a perspective view with enlarged detail. A multitude of support bars 3 and a multitude of cross bars 5 are each aligned parallel to each other, such that the cross bars 5 intersect the support bars 3 at right angles in so-called intersection fields 7, specifically in the upper region of the support bars 3. The support bars 3 have a multitude of openings 9, each of which terminates in the upper, forming-related radius 37 of the support bar 3. The cross bars 5 are designed as flat material, in particular in the form of a sheet metal strip, and each extends through a number of openings 9, which are aligned with each other. The cross bars 3 are held in the openings 9 by an interference fit, whereby additional (spot) welds may be provided.

[0042] Another example of a grating 1 in perspective view with enlarged detail shows Fig. 1d. A multitude of support bars 3 according to Fig. 1a and a plurality of crossbars 5 are each aligned parallel, consequently the crossbars 5 intersect the load-bearing bars 5 at right angles in intersection fields 7. In contrast to the embodiment shown in Fig. In 1c, the crossbars 5 are formed by twisted square struts. The other features essentially correspond to the features of the grating 1 from Fig. 1c, so that reference is made to the corresponding description.

[0043] Fig. Figure 2a shows a second embodiment of a support bar 3, or a first strut, in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece. By forming 112 by more than 180°, two second support layers 35 were formed on one flat side 31, wherein the first and second support layers 33, 35 are arranged relative to each other such that a substantially C-shaped cross-sectional profile is formed section by section. As a result of the forming 112, the narrow edges 15 are oriented substantially towards each other. The first and second support layers 33, 35 are oriented at an angle to each other. The opening angle α is approximately 15°, with the first and second support layers 33, 35 being connected to each other via a radius 37.Furthermore, the support rod 3 is designed in a mirror-symmetrical manner with respect to a mirror plane S, which is aligned perpendicular to the flat sides 31.

[0044] The width of the support bar 3 before forming 112 is approximately 60 mm, of which 20 mm are formed (10 mm on each narrow edge). The support layer width B is 10 mm, and the free section F of the support bar 3 between the two second support layers 35 is 20 mm.

[0045] A cross-section of an exemplary grating 1 with a plurality of bearing bars 3 according to the second embodiment is shown. Fig. 2b. The load-bearing bars 3 are oriented such that their flat sides 31 and the second support layers 35 point in the same direction. Crossbars 5 intersect the load-bearing bars 3 in respective intersection fields 7, the width B of the support layers essentially corresponding to the upright cross-sectional profile of the crossbars 5. Furthermore, the end faces 13 of the crossbars 5 abut an edge restraint 11.

[0046] The grating 1 made of Fig. 2b shows Fig. Figure 2c shows a perspective view with enlarged detail. A plurality of load-bearing bars 3 and a plurality of crossbars 5 are each aligned parallel to each other, such that the crossbars 5 intersect the load-bearing bars 3 at right angles in intersection fields 7. Due to the comparatively large radius 37 in the intersection fields 7, the load-bearing bars 3 are wider than in the case of the first embodiment according to [reference missing]. Fig. 1a or 1c. This increases, among other things, the shear strength of the grating 1. Furthermore, the bearing bars 3 have a plurality of openings 9, each of which terminates in the upper, forming-related radius 37 of the bearing bar 3. The crossbars 5 are designed as flat material, e.g., in the form of a sheet metal strip, and each extends through a number of openings 9, which are aligned with each other. The crossbars 5 are held in the openings 9 by an interference fit, whereby additional (spot) welds may be provided.

[0047] Fig. Figure 3a shows a third embodiment of a support bar 3 or a first strut in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece and shaped 112 according to the first embodiment. Fig. 1a. In addition, the load-bearing bar 3 has a first and a second fold 39, each of which is formed adjacent to the second support layers 35 in such a way that the support layer widths B are limited. Furthermore, the folds 39 result in a plane of the neutral zone E of a load-bearing bar 3 being arranged essentially between the first and second support layers 33, 35.

[0048] Fig. Figure 4a shows a fourth embodiment of a support bar 3 or a first strut in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece and are essentially reshaped 112 according to the first and third embodiments. Fig. 1a and Fig. 3a. In contrast to the first and third embodiments, one of the second support layers 35 is formed on the first flat side 31 of the support bar 3, whereas the other of the second support layers 35 is formed on the second flat side 31 of the support bar 3. As in the third embodiment above, the support bar 3 furthermore has a first and a second fold 39, which are each formed adjacent to the second support layers 35 in such a way that the support layer widths B are limited.

[0049] A cross-section of an exemplary grating with a plurality of bearing bars 3 according to the fourth embodiment is shown. Fig. 4b. The support bars 3 are arranged such that the upper second support layers 35 are each oriented in a first direction. In contrast, the lower second support layers 35 are each oriented in a second direction, opposite to the first. Alternatively, it is possible to arrange for two second support layers 35 to face each other.

[0050] Fig. Figure 5a shows a fifth embodiment of a support bar 3 or a first strut in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece. Crucially, the support bar 3 is formed multiple times 112 in both its upper and lower regions, so that a plurality of second support layers 35 are formed, and the first and second support layers 33, 35 are arranged relative to each other in such a way that a substantially arrow-shaped cross-sectional profile is formed in sections. The first and second support layers 33, 35 are oriented at an angle to each other. The opening angle α is approximately 45°, with the first and second support layers 33, 35 being connected to each other via a first radius 37 and the second support layers 35 being connected to each other via further radii 37.

[0051] The width of the support bar 3 before forming 112 is approximately 100 mm, of which approximately 60 mm are formed 112 (30 mm on each narrow edge).

[0052] A cross-section of an exemplary grating 1 with a plurality of bearing bars 3 according to the fifth embodiment is shown. Fig. 5b. Crossbars 5 intersect the load-bearing bars 3 in respective intersection fields 7, the support width B essentially corresponding to the upright cross-sectional profile of the crossbars 5. In addition, the end faces 13 of the crossbars 5 abut an edge restraint 11.

[0053] The grating 1 made of Fig. 5b shows Fig. Figure 5c shows a perspective view with enlarged detail. A multitude of load-bearing bars 3 and a multitude of crossbars 5 are each aligned parallel to each other, such that the crossbars 5 intersect the load-bearing bars 3 at right angles in intersection fields 7, specifically in the upper region of the load-bearing bars 3. Due to their arrow-shaped cross-sectional profile, the load-bearing bars 3 are very wide in the intersection fields 7. This significantly increases, among other things, the shear strength of the grating 1. The load-bearing bars 3 have a multitude of openings 9, each of which terminates in the upper, forming-related radius 37 of the load-bearing bar 3. The crossbars 5 are designed as flat material, in particular in the form of a sheet metal strip, and each extends through a number of openings 9, which are aligned with each other. The crossbars 5 are held in the openings 9 by an interference fit, whereby additional (spot) welds may be provided.

[0054] Fig. Figure 6a shows a sixth embodiment of a support bar 3 or a first strut in a perspective view. The support bar 3 is designed as a flat bar with two opposing flat sides 31 and two narrow edges 15. The first and second support layers 33, 35 are formed in one piece. It can be seen that the support bar 3 is formed multiple times 112 in both the upper and lower regions, so that a plurality of second support layers 35 are formed in each region, and the first and second support layers 33, 35 are arranged relative to each other in such a way that a substantially T-shaped cross-sectional profile is formed section by section.

[0055] The width of the support bar 3 before forming 112 is approximately 100 mm, of which 60 mm are formed 112 (30 mm on each narrow edge side).

[0056] A cross-section of an exemplary grating 1 with a plurality of bearing bars 3 according to the sixth embodiment is shown. Fig. 6b. Crossbars 5 intersect the load-bearing bars 3 in respective intersection fields 7, wherein the support width B is less than the upright cross-sectional profile of the crossbars 5. In addition, the end faces 13 of the crossbars 5 abut an edge restraint 11.

[0057] The grating 1 made of Fig. 6b shows Fig. Figure 6c shows a perspective view with enlarged detail. A plurality of load-bearing bars 3 and a plurality of crossbars 5 are each aligned parallel to each other, such that the crossbars 5 intersect the load-bearing bars 3 at right angles in intersection fields 7, specifically in the upper region of the load-bearing bars 3. For this purpose, the load-bearing bars 3 have a plurality of openings 9, each of which opens into the upper section of the load-bearing bar 3. The crossbars 5 are designed as flat material, in particular in the form of a sheet metal strip, and each extends through a number of openings 9, which are arranged in alignment with each other. As in the second and fifth embodiments, the load-bearing bars 3 are very wide in the intersection fields 7 due to the T-shaped cross-sectional profile, so that the shear strength of the grating 1 is significantly increased.The crossbars 5 are held in the passage openings 9 in a press fit, whereby additional (spot) welds may be provided.

[0058] Fig. Figure 7 shows a schematic representation of a method 100 for manufacturing a grating 1. A plurality of first struts 102 are provided, wherein the first struts are provided with a number of second support layers 35 110. The first struts thus have first and second support layers 33, 35, which are formed in one piece. The second support layers 35 are produced by forming 112 the first struts. Essentially, only two forming operations 112 can be provided, e.g., for forming a bearing bar 3 according to the embodiments shown in Figure 7. Fig. 1a or Fig. 2a, or a further number of forming operations 112, e.g. for the design of a support bar 3 according to the embodiments according to Fig. 5a or Fig.6a. Furthermore, the first struts are provided with a large number of passage openings 9.

[0059] Likewise, a large number of second struts are provided 104. The first and second struts are aligned parallel 106 so that the second struts intersect the first struts at right angles. The second struts are designed to extend through aligned openings 9 in the first struts. The first and second struts are joined 108 by pressing 116 the second struts into the first struts. The second struts are held in place by a positive-locking and force-fit connection.

[0060] Furthermore, an edge trim 11 is attached to the end faces of the first and second struts 114.

[0061] The invention is not limited to one of the embodiments described above, but can be modified in many different ways.

[0062] All features and advantages arising from the claims, the description and the drawing, including design details, spatial arrangements and process steps, can be essential to the invention both individually and in various combinations. Reference symbol list 1 grating 3 support bars 5 crossbars 7 Intersection field 9 Passage opening 11 Edge trim 13 Front 15 narrow edges 31 flat page 33 First support position 35 Second support position 37 radius 39 fold 100 procedures 102 Providing initial aspirations 104 Providing second aspirations 106 Align 108 Connect 110 Provision of second support layers 112 Transformation 114 Attaching an edge trim 116 Pressing in B Support width E level neutral zone F Free Section S Mirror plane α Opening angle QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 18 17 660 A1

[0007] WO 97 / 43 500 A1

[0007] DE 20 2013 103 144 U1

[0007]

Claims

[1] Grating (1) comprising a plurality of first struts, designated as load-bearing bars (3), each of which is designed as a flat bar with two opposing flat sides (30), and a multitude of second struts, called crossbars (5), crossing the first struts, characterized by , that the first struts form a first support position (33), and that at least on one of the flat sides (31) a second support layer (35) is formed, which is preferably connected to the first support layer (33). [2] Grating (1) according to claim 1, characterized by , that second struts cross first struts in a crossing field (7), and that the second support layer (35) is arranged between two crossing fields (7). [3] Grating (1) according to claim 1 or 2, characterized by , that a first and a second support position (33, 35) are adjacent to each other. [4] Grating (1) according to any one of the preceding claims, characterized by , that a first and second support layer (33, 35) is formed in one piece. [5] Grating (1) according to any one of the preceding claims, characterized by , that a first and second support layer (33, 35) are arranged in such a way that at least in sections a substantially U-, C-, O-, T- and / or arrow-shaped cross-sectional profile is formed. [6] Grating (1) according to any one of the preceding claims, characterized by , that a second support position (35) is oriented at an angle to the first support position (33), wherein the opening angle (α) is in particular between 1 and 179°, preferably between 10 and 90°. [7] Grating (1) according to any one of the preceding claims, characterized by , that first struts have a number of openings (9), and that second struts extend through the number of openings (9). [8] Grating (1) according to any one of the preceding claims, characterized by , that first struts have a multitude of second support positions (35). [9] Grating (1) according to claim 8, characterized by , that first struts on both flat sides (31) each have at least one second support layer (35). [10] Grating (1) according to any one of the preceding claims, characterized by , that first struts have at least one fold (37), which is formed in particular adjacent to a second support layer (35). [11] Grating (1) according to any one of the preceding claims, characterized by , that first struts are designed as parallel load-bearing bars (3), and that second struts are designed as parallel transverse bars (5).

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