DE4237912A1 - Wall cladding element of pressed plastics - has upper and lower surface with base sections and parallel bridging struts and cross members - Google Patents

Abstract

The plate-shaped element (10) has two parallel surfaces (16,16a) such that each forms the outer face of the plate base (15,17) consisting of two base sections (12,14). The bases (15,17) are set a distance apart, and the element has pairs of parallel bridging struts (22,24;20,22;20,24) with a groove (26) in between. Each groove is enclosed forming a chamber via a cross member (28). Both base sections are connected together airtight in the region of the struts and cross members. USE/ADVANTAGE - For wall cladding, separating walls, pallets. It has a high stiffness and load carrying capacity with a long operating life and is corrosion free and cost-effect.

Description

The invention relates to a pressed plastic plate-shaped element with two its top or its underside forming parallel to the plate plane len surfaces.

Plate-shaped elements are very different che use cases suitable such. B. as elements for covering walls, for creating partitions walls or for separating boxes in stables, where both with high mechanical loads as well aggressive environmental influences can be expected, however also as load-bearing elements on shelves or in form of pallets.

The use is for different applications of plate-shaped elements made of plastic desirable, but because of material-related inheritance have not yet been solved in practice. For example, to delineate pigs bays or calf boxes in stables as a rule between vertical grooves with vertical grooves Posts or columns of horizontal changes elements in the form of elongated rectangles, the height of the partition by the number of wall elements arranged one above the other is determined. The moist and aggressive atmosphere leads to considerable difficulties. Made of wood Wall elements rot over time. The attempt, wooden wall elements through those made of stainless steel too replacing is not only done at the high cost tert, rather it has been shown that because of the high Thermal conductivity stainless steel for the animals very unan  is approved when in contact with this material to shrink from the perceived cold.

The use of plastic sheets has changed from that Proven material resistance, but caused the elasticity of the material problems because the Dodge plates far when impacting animals. Hard PVC is sufficiently rigid, but not unbreakable and therefore cannot be used. Apart from that, hard PVC difficult to dispose of and is also intended for this reason Not used. Other plastic sheets one has relatively elastic material with edge profiles made of metal to be sufficiently rigid make, at the same time an engagement of the edge profiles Wall elements arranged one above the other are provided was to stabilize the partition.

This construction has also not proven itself because the exposed profiles, unless they are made of precious steel and were therefore very expensive due to the aggressive Atmosphere were attacked. Also have in the horizontal joints bacteria and other damage that nestled, even with thorough cleaning could hardly be removed.

The high elasticity, the risk of breakage, the absence one is cost effective on the one hand and on the other hand possible corrosion-resistant stiffening or ver strengthening the load capacity and the demand for environmentally friendly disposal of decommissioned Elements also pose problems when using panels shaped plastic elements such. B. as shelves or Pallets.

It is therefore the object of the invention to be plate-shaped Plastic elements of the aforementioned Kind in such a way that they are as stiff as possible and are sustainable, a long service life can be expected and therefore as shatterproof as possible and free of corrosion Components susceptible to sion are that they cost cheaply made in large numbers, simple and effectively cleaned and disposed of in an environmentally friendly manner, and can be used as versatile as possible.

According to the invention, this object is achieved with the element described in the introduction that each of the surfaces the outside of the plate-shaped The basis is one of two basic bodies, whose Bases are spaced from each other that the space between the bases of the basic bodies by pairs of parallel to each other, between overlap a groin enclosing is bridged at both ends of each ledge couple the groove each by one of two bases binding crossbar to a chamber is closed, that at least in a groove a rigid reinforcement insert is inserted, and that the two base body in the area of the strips and crossbars with each other are hermetically connected.

Such an element can be advantageous Design inexpensively from plastic Plastic waste, especially unsorted house residual waste, are produced. This material is, also because of its polyethylene content resilient, tough, inelastic and unbreakable, and can, for example, pass through like wood Nails are attached.  

The element has a simple, easy to clean Surface and has because of the internal structure high rigidity and load capacity, depending on the given requirements even further can be improved that of those in the invention Element trained, airtight to the outside closed chambers depending on the expected loading load one, several or all with one each Reinforcement insert can be provided before the two base bodies with each other, preferably through Vibration or mirror welding. Because the reinforcement inlays in the chambers are tightly enclosed and also when welding the humidity in the chambers is reduced, there is no metal reinforcement insert Risk of corrosion, so that inexpensive alloys can be used.

Preferably the length of the reinforcement insert considering thermal conditions gene changes of the wall element on the one hand and the Reinforcement insert dimensioned on the other hand, so that even at the maximum expected limit temperatures no disturbing effects are to be feared.

For the corrosion protection of the reinforcement inserts are just the crossbars at the ends of each Pair of strips required. For additional stabilization lization of the plate-shaped element and Creation of the simplest possible, for foulness tongue-less sensitive surface, however, it is a advantageous embodiment that the space between the Bases along the circumference of the plate-shaped element by at least on one of the base bodies on its base  Edge formed on the side facing away from the outside afford is closed.

It is used for simple manufacture if after a expedient embodiment, the strips, crossbars and, if necessary, sidebars opposite the base of a base body have the same height. Before are preferably on both base bodies of the element strips coincident with each other, cross webs and, if necessary, molded borders, whereby the height of the last, crossbars and if necessary Sidebars of a base body approximately that Distance of the bases of the two that make up the element Basic body corresponds, while the height of the strips, Crossbars and, if necessary, edge strips of the other Base body at the height of welding attachments is limited so that before the connection of the two Base body the reinforcement inserts completely in the grooves formed between the pairs of strips can be embedded.

Another expedient embodiment exists for Simplification of production in that in one Group of pairs of parallel bars all Strips are arranged parallel to each other. Here the element can also be two groups of pairs other parallel bars, with the direction the ledges of one group the direction of the ledges the other group cuts, being in the cutting area of each pair of strips of a group with one The last pair of strips in the other group are interrupted by everyone. Strips pairs included grooves in connection stand.  

In this case, preference is given to highly loadable ones Elements are a grid-like, rigid reinforcement lay in the interconnected grooves inserted.

According to a further advantageous embodiment ver at least the strips of a group run parallel an edge of the element. This serves among other things the cheap power transmission when rectangular Elements on two opposite sides supports or z. B. with vertically arranged Barn partitions inserted in vertical guide rails leads are.

Because of the relatively high load-bearing capacity of the elements they are good as inexpensive and durable Pallets. There is a special one for this purpose advantageous embodiment of the element in that at least adjacent to its edge, at the corners of a Positions forming polygons, over a surface protruding feet are arranged.

The feet are expediently adjacent to them shaped beard body.

The feet are preferably designed as hollow bodies and in one that is kept free by the pairs of strips Area arranged, their cross section in Towards their free end steadily tapered and that surface of the element facing away from the feet one for each of the feet opposite has a suitable opening, wherein the cavity enclosed by the feet Direction to this opening opens and the Area between the opening and the foot  load-bearing body with one on both bases airtight wall is enclosed, whose inner wall surface is flush with the inner wall surface of the foot passes.

The element preferably has a rectangular one Floor plan on and the feet are at least on it four corners distributed, with another purpose moderate design the free ends of the feet and skids matched to the distance between two feet mutually associated connecting elements in such a way are provided that the element below the feet with two parallel runners can be seen.

Another application is when according to a further embodiment, at least on the side of the ledge pairs facing away from the grooves located cavities filled by a filler are that a thermally insulating material or can be a sound absorbing material. In the latter case it improves the sound absorbing Properties if the ones containing the filling material Cavities through openings in the bases of the Basic bodies are open to the outside and / or if the surface of the base body with sound-refracting Profiling is provided.

So much for those formed between the pairs of grooves Chambers do not take advantage of reinforcement inserts can be taken, these chambers with filling material.

A particularly advantageous embodiment exists in that the cavities with a plastic filler are poured out or foamed. Here  can be melted in a particularly cost-effective manner Waste polystyrene can be used. By pouring out or foaming the chambers with gaps filled with the insulation material, which can be cut even with precise cutting leaves.

When foaming z. B. a foamable mate rial before welding the two base bodies in the cavity to be filled in on a base body are brought, the foam formation is delayed is set so that the other basic body to close the cavity with the first one Base body can be welded to what finally the foam formation within the abge closed cavity and a special shape for the production of fillers as well as filling openings to fill everyone the separate cavities.

Elements according to the invention are particularly suitable in their thermally insulating embodiment position of building walls in connection with a Frame construction from z. B. profile bars. For one such application, it is particularly advantageous if the element has a rectangular plan and on two parallel edges with lengthways Grooves in the direction of these edges is. The elements can then be placed in the frame construction that you insert the profile enclose bars and cold bridges are avoided.

Around panels that are adjacent to each other To be able to connect others, there is another be preferred embodiment in that each element has a  has rectangular plan and two to each other parallel edges with in the longitudinal direction of these edges trending, mutually engaging assigned, complementary profiles is.

The manufacturing is thereby particularly united folds that an advantageous embodiment on one of the two parallel edges the bases of both bases body to form a groove-shaped profile protrude beyond the sidebar and that on other of the two parallel edges the base of the with welded base body flush with the outer surface of the sidebar on the other Base body that ends on the inside of the Base subsequent section of the sidebar with one for engaging in the groove-shaped profile of an adjacent element suitable projection is provided.

The elements of the invention can also be used position particularly simple and inexpensive Roof structures are used. To this end the element is designed such that its upper side with arranged in interrupted graters, too rib-like, parallel to one edge of the element, each stop facing the same side shoulders forming, crossing the element jumps is provided. Take these lead the function of roof battens, so that on the thermal insulating, in the sloping roof with horizontal ver running projections on a supporting frame con structure attached elements roof tiles more common Design can overlap each other, the breaks in the rows of protrusions  ge air circulation especially in the direction of Allow sloping roof.

The pairs of strips preferably cross the element Completely.

Based on the following description of the in the Drawing illustrated embodiments of the he this is explained in more detail.

It shows

Fig. 1 shows a cross section through a first exporting approximate shape of a flat-shaped element according to the invention along the line II in Fig. 3,

Fig. 2 is a cross section along the line II-II in Fig. 3,

Fig. 3 is a section along the line III-III in Fig. 1, wherein the right and left sides of two different arrangement of the pairs of strips show

Fig. 4 port range is a section along line II-II in Fig. 1 in a third embodiment as Trans,

Fig. 5 is a section similar to FIG. 1 through the corner area of a ausgebil Deten as a transport pallet element on a larger scale and

Fig. 6 is a partial section similar to FIG. 2 through a serving as a roof insulation Ausfüh approximate shape.

The element shown in FIGS . 1 and 2, designated overall by 10 , essentially consists of two base bodies 12 and 14 produced in the pressing process from plasticized household plastic waste, which are permanently connected to one another, preferably by mirror welding.

The base body 12 consists of a rectangular, plate-shaped base 15 , one side 16 of which forms an outer side of the element 10 . On the side 18 facing away from the side 16, an edge strip 20 extends at right angles to the plate level along the circumference of the plate. Between two mutually opposite sections of the edge strip 20 , mutually paired parallel strips 22 and 24 run , each of which includes a groove 26 between them. In the example shown in the left half of FIG. 2, all strips 22 and 24 run parallel to two parallel side edges of the base 15 . In this case, according to the width of the grooves 26, the strips 24 and 22 arranged adjacent to the strips 22 and 24 parallel to the strips 20 and 22 can also be arranged directly in the edge region of the base 15 grooves 26 . This possibility exists even if, after the variant shown in the right half of FIG. 2, the first group of strips 22 and 24 a second group of strips 22 'and 24 ' is added, which is perpendicular to the strips. 22 and 24 of the first group. In this case, the strips 22 and 24 or 22 'and 24 ' are each interrupted in the intersection of the two Lei stengruppen so that the grooves 26 and 26 'are connected.

Instead of parallel to the edges of the base 15 , the strips 22 and 24 or 22 'and 24 ' can also run obliquely to the edges and optionally also in a sharp angle to each other, so that the grooves 26 and 26 'form a diamond-shaped pattern.

Where the grooves 26 and 26 'meet the edge strips 20 , the groove 26 and 26 ', each overque-generating section of the edge strips 20 forms a web 28 , which closes each groove 26 and 26 '.

The base body 14 consists of a likewise rectangular, plate-shaped base 17 , with a side 16 a forming an outer surface of the element 10 and a side 18 a facing the side 18 of the base 15 , which is congruent with the side 18 , ie with the edge strips 20 and the strips 22 and 24 or 22 'and 24 ' corresponding profiles 20 a ', 22 a, 24 a, 22 ' a and 24 'is provided, the height of which, however, is relatively low because of its function as a welding approach, while the height of the edge strips 20 and the strips 22, 24, 22 'and 24' close to the spacing of the opposing member 10 in the finished Be th 18 and 18 corresponds to a.

Before the two base bodies 12 and 14 are connected to each other to form the element 10 , reinforcement inserts 30 can be inserted into one or more or all of the grooves 26 and / or 26 ', depending on the desired stability and load-bearing capacity, for the reinforcement of the element 10 . If two groups of grooves 26 and 26 'are present, a grid-like construction adapted to the overall system of the grooves 26 and 26 ' can also be introduced as a reinforcing insert.

By carefully welding the base bodies 12 and 14 , the grooves are to be closed to form airtight chambers, in which the reinforcement inserts 30 are protected against corrosion.

If the application requires, the outside of the grooves 26 and 25 'located cavities in the element 10 and - insofar as the grooves 26 and 26 ' are not used for receiving reinforcing inserts 30 - the grooves 26 and 26 'with one Filling material 32 are filled, which can be sound-absorbing or thermally insulating. It is particularly inexpensive. B., fill these cavities in the base body 12 with converted into a flowable waste polystyrene. But you can, for example, also introduce a foam-forming material with delayed foam formation shortly before the welding of the two base bodies 12 and 14 into the cavities to be filled, so that after welding a gapless filling with foam material is achieved without special shapes or cost-causing filling openings required are.

If the elements 10 are filled with sound-absorbing material, it may be advantageous to open the cavities located outside of the grooves 26 and 26 'through openings in the bases 15 and / or 17 to the outside in order to prevent the penetration of the sound waves into the insulating area to enable. In addition, the outer surfaces 16 and / or 16 a can be provided with sound-absorbing profiles.

To the panel-members 10 interconnected, are provided with two mutually parallel sides assigned to one another for mutual engagement profiles 32 and 34, wherein the profi ling 32 as a groove and the profile 34 is formed as a spring.

In particular, thermally insulating elements 10 can also be used as facade cladding or as building elements for building walls, it being advantageous that the pressed waste plastic can cling to wallpaper, even fire-retardant wallpaper, ver. So that the elements 10 can be used while avoiding thermal bridges between a supporting structure forming profile bars, it is expedient if groove-shaped profiles 32 are provided on mutually parallel side edges of the element 10 , so that the profile bar is encompassed by adjacent elements on the sides can be.

In the manufacture of an element 10 , which has an edge profile 34 serving as a spring, it makes production easier if the base body 14 ends on the side having this profile 34 with the welding shoulder 20 a assigned to the edge strip, while the base body 12 on the outside the edge strip 20 is provided with a projection 36 forming the spring.

Since the element according to the invention combines a relatively flat design with a simple surface design with a high load-bearing capacity, it is particularly suitable as a transport pallet if it is provided with feet which allow the fork of a forklift truck to reach under the element. A correspondingly permitted pallet 100 is shown in FIGS. 3 and 4.

The loading plate 110 of the pallet 100 corresponds essentially to the element 10 , the cavity between the lower base body 112 and the upper base body 114 is completed from the skirt 120 to the outside, without the edge being provided with profiles in this case, so that there is a particularly simple, easy-to-clean outer surface. The strips 22 and 24 of the element 10 correspond with the pallet 100, the strips 122 and 124 , and also with the pallet 100, the arrangement of the strips can be varied according to the possibilities described above, that is, for. B. to form a group of parallel grooves 126 or to form a group of intersecting grooves. Likewise, the number of reinforcing inserts 130 introduced into the grooves 126 can be varied, and a grid-shaped reinforcing insert can be provided if the grooves are arranged accordingly.

In an arrangement customary for pallets, three rows of three feet 140 each are provided on the underside of the pallet 116 , these feet being molded onto the base body 112 and tapering towards their free end. The feet 140 are hollow out and are formed by a truncated cone-shaped or truncated pyramid-shaped jacket 142 with an inner wall surface 144 , which is closed at its free end by a bottom 146 . The jacket 142 is connected to the base 115 of the base body 112 , the ribs 122 and 124 being distributed on the base 115 in such a way that the regions are free from strips on which the feet 140 are arranged, in the manner described below the possibility is created to stack empty pallets in a particularly space-saving manner.

The base 115 is a penetrated by the integrally formed on its jacket 142 in the region in their formed opening 148, in which the shell 142 then continues to the inner side 118 of the base 115 and by the height of the strips 120, 122 and 124 given level ends. While maintaining the tip angle selected for the inner wall surface 144 of the casing 142 , this wall surface 144 continues in the interior of the hollow loading plate 110 . On the upper base body 114 , the base 117 is provided on its inner side 118 a with a welding end 142 a assigned to the free end of the jacket 142 on the base body 112 , which is designed in such a way that it has one after welding the two base bodies 112 and 114 to the inner wall surface 144 has flush inner wall surface 150 , which opens into an opening 152 on the outside 116 a of the base 117 . After the two base bodies 112 and 114 have been welded , the pallet 100 thus has on its upper side 116 openings formed by the openings 152, which are adjoined by a cavity 154 delimited by the wall surfaces 144 and 150 , which overlaps to accommodate the corresponding foot 140 the pallet 100 stacked pallet of the same type is suitable. The area provided for receiving the reinforcing inserts 130 within the hollow loading plate 110 is airtight in relation to the cavity 154 .

In order to be able to move the pallets 100 , it is possible to arrange 140 runners 150 under the feet in a known manner. For this purpose, runners 150 made in Preßverfah ren are provided, the feet 140 associated locking pins 152 with a convex in the longitudinal section convex cross-sectional shape, so that by pressing the locking pins 152 into openings 154 in the bottom 146 of each foot 140, the runners 150 permanently each can be connected with a row of three feet 140 .

A further variant is shown in FIG. 6. It is an element in which the cavities not used by reinforcement inserts are filled with an insulating material 32 and two parallel edges are provided with profiles 32 and 34 , in order to form-fit adjacent elements to be able to engage. For use as roof insulation, projections 72 are arranged on the outside 16 a of the basic body 14 in interrupted rows, all of which have stop shoulders 74 pointing to the same side, which can be used like roof battens for fastening roof panels. The alternating in each row successive jumps 72 and gaps not shown are matched to the standard dimensions of roof panels and distributed so that on the one hand the roof panels can be securely fixed and on the other hand through the inter mediate spaces air circulation in the area between the roof panels and the outer surface 16 a of the elements can take place.

Claims (25)

1. Plastic pressed, plate-shaped element ( 10 ) with two its top ( 16 a) or its underside ( 16 ) forming parallel surfaces, characterized in that each of the surfaces the outside of the plate-shaped base ( 15 , 17 ) each have one of is two base bodies ( 12 , 14 ), the bases ( 15 , 17 ) of which are arranged at a distance from one another, that the space between the bases ( 15 , 17 ) of the base body ( 12 , 14 ) is parallel between each other by pairs of each other a groove ( 26 ; 26 ') enclosing strips ( 22 , 24 ; 20 , 22 ; 20 , 24 ) is bridged that at both ends of each pair of strips, the groove ( 26 ) each by a crossbar connecting both bases ( 15 , 17 ) ( 28 ) is closed into a chamber, and that the two basic bodies ( 12, 14 ) in the area of the strips ( 20 , 22 , 24 ) and crossbars ( 28 ) are connected to one another in an airtight manner. 2. Element according to claim 1, characterized in that a rigid reinforcing insert ( 30 ) is inserted at least in a groove ( 26 ). 3. Element according to one of claims 1 or 2, characterized in that the space between the bases ( 15 , 17 ) along the circumference of the plate-shaped element ( 10 ) by at least one of the Grundkör by ( 12 ) on the outside ( 16 ) facing side ( 18 ) molded edge strips ( 20 ) is closed. 4. Element according to one of claims 1 to 3, characterized in that the strips ( 22 , 24 ), transverse webs ( 28 ) and optionally edge strips ( 20 ) relative to the base ( 15 ) of a base body ( 12 ) have the same height. 5. Element according to one of claims 1 to 4, characterized in that on both base bodies ( 12 , 14 ) of the element ( 10 ) coincident associated strips ( 22 , 22 ', 24 , 24 '), transverse webs ( 28 , 28 ' ) and optionally edge strips ( 20 , 20 ') are formed, the height of the strips ( 22, 24 ), transverse webs ( 28 ) and optionally edge strips ( 20 ) of one base body ( 12 ) approximately the distance between the two bases ( 15 , 17th ) of the element ( 10 ) forming the base body ( 12 , 14 ) corresponds, while the height of the strips ( 22 ', 24 '), transverse webs ( 28 ') and, if appropriate, edge strips ( 20 ') of the other base body ( 14 ) on the The amount of welding approaches is limited. 6. Element according to any one of claims 1 to 5, characterized in that in a group of pairs Ren ( 22 , 24 ; 22 a, 24 a; 22 ', 24 ') to each other parallel strips all strips are parallel to each other net angeord. 7. Element according to claim 6, characterized in that it comprises two groups ( 22. 24 ; 22 ', 24 ') of pairs of parallel strips, the direction of the strips of the one group ( 22 , 24 ) the direction of the strips the other group ( 22 ', 24 ') cuts, and that in the intersection of each pair of strips of one group with a pair of strips of the other group, the strips are interrupted such that the grooves enclosed by all pairs of strips ( 26 ; 26 ') with each other in Connect. 8. Element according to claim 7, characterized in that a grid-like, rigid reinforcing insert ( 30 ') is inserted into the grooves ( 26 , 26 '). 9. Element according to one of claims 6 to 8, characterized in that at least the strips ( 22 , 24 ; 22 ', 24 ') of a group run parallel to an edge of the element ( 10 ). 10. Element ( 100 ) according to any one of the preceding claims, characterized in that at least its edge adjacent, at the corners of a polygon forming positions, on a surface ( 116 ) outwardly projecting feet ( 140 ) are arranged. 11. Element ( 100 ) according to claim 10, characterized in that the feet ( 140 ) are integrally formed on the adjacent base body ( 112 ). 12. Element ( 100 ) according to claim 11, characterized in that the feet ( 140 ) are formed as a hollow body and are arranged in an area kept free by the strip pairs ( 122 , 124 ) that their cross section in the direction of their free end ste tig Tapered that the upper surface facing away from the feet ( 116 a) of the element ( 100 ) opposite each of the feet ( 140 ) opposite a ge suitable for insertion of a foot opening ( 152 ) that the cavity enclosed by the feet ( 140 ) ( 154 ) opens in the direction of this opening ( 152 ) and that the area between the opening ( 152 ) and the base body ( 112 ) carrying the foot ( 140 ) is enclosed with a wall which adjoins both bases ( 115 , 117 ) in an airtight manner, whose inner wall surface ( 150 ) merges into the inner wall surface of the foot ( 144 ). 13. Element ( 100 ) according to any one of claims 10 to 13, characterized in that the element has a rectangular plan and the feet ( 140 ) are distributed at least on its four corners. 14. Element according to claim 13, characterized in that the free ends ( 146 ) of the feet ( 140 ) and matched to the distance between two feet runners ( 160 ) with mutually associated connecting elements ( 162 , 164 ) are provided such that the element ( 100 ) below the feet ( 140 ) can be provided with at least two mutually parallel runners ( 160 ). 15. Element according to any one of claims 1 to 9, characterized in that at least on the side facing away from the grooves ( 26 , 26 ', 26 a) of the Lei pairs ( 22 , 24 ; 22 a, 24 a; 22 ', 24 ') cavities are filled by a filler ( 36 ). 16. Element according to claim 15, characterized in that the filling material ( 36 ) is a thermally insulating material. 17. Element according to claim 15, characterized in that the filling material ( 36 ) is a sound-absorbing material. 18. Element according to one of claims 15 to 17, characterized in that the cavities are marked with a Plastic filling material poured out or foamed are. 19. Element according to claim 17, characterized records that the hollow containing the filler clear openings in the bases of the basic body are open to the outside. 20. Element according to any one of claims 17 or 18, characterized in that the surface of the Basic body with sound-breaking profiles see is. 21. Element according to any one of claims 1 to 9 or 15 to 20, characterized in that it has a rectangular plan and is provided on two mutually parallel edges with grooves ( 32 ) extending in the longitudinal direction of these edges. 22. Element according to any one of claims 1 to 9 or 15 to 21, characterized in that it has a rectangular plan and on two mutually parallel edges with complementary profiles ( 32 , 34 ) extending in the longitudinal direction of these edges and mutually associated for mutual engagement. is provided. 23. Element according to claims 5 and 22, characterized in that the bases ( 15 , 17 ) of both base bodies ( 112 , 114 ) form one of the two paral lelic, with complementary profiles ( 32 , 34 ) edges groove-shaped profi ling (32) over the edge strip (20) through to the outside and that at the other of the two parallel edges of the base (17) of the with the welding lugs (20 a, 22 a, 24 a) provided the base body (14) is flush with the outer surface the edge strip ( 20 ) ends at the other base body ( 12 ), which on the inside ( 18 ) of its base ( 15 ) adjoining section of the edge strip with an engagement with the groove-shaped profile ( 32 ) of an adjacent element ( 10 ) is provided suitable projection ( 34 ). 24. Element according to claim 16 and one of claims 21 to 23, characterized in that its upper side ( 16 a) with arranged in broken rows, to an edge of the element ( 10 ) parallel, rib-like, each on the same side turned stop shoulders ( 74 ) forming, the element crossing projections ( 72 ) is provided. 25. Element according to any one of the preceding claims, characterized in that the strip pairs ( 2 , 24 ; 22 a, 242 a; 22 ', 24 ') cross the element ( 10 ) completely constantly.