FASTENING RAIL AND CONCRETE ELEMENT HAVING A FASTENING RAIL

Abstract

A fastening rail for embedding into a concrete element has one rail back, two rail lips and two rail longitudinal sides disposed opposite one another. The rail lips delimit a slot between them. The fastening rail is realized in an anchorless manner and forms at least one undercut from the rail back in the direction of the outside of the rail lips. To improve anchoring in the concrete, the rail back has profiling on its outside which is remote from the rail lips. The fastening rail is advantageously embedded into a concrete element such that the outside of the rail lips lies flush with the surface of the concrete element. A method for making a fastening rail provides that a profiling is produced in at least top one center region a metal plate and the metal plate is re-shaped to form the rail back, rail longitudinal sides and rail lips.

Claims

1. A fastening rail for embedding in a concrete element, the fastening rail comprising: a fastening rail body defining a rail longitudinal direction; said fastening rail body having one rail back, two rail lips and two rail longitudinal sides disposed opposite one another and extending in the rail longitudinal direction; said rail longitudinal sides each having a first side facing away from said rail back; each of said rail lips extending on said first side of said rail longitudinal sides and projecting toward one another from corresponding ones of said rail longitudinal sides; said rail lips delimiting a slot between each other; said rail lips having a rail lip outside which faces away from said rail back; the fastening rail being configured in an anchorless manner; said fastening rail body forming at least one undercut from said rail back in the direction of said rail lip outside; said rail longitudinal sides each having a longitudinal outside; said rail back having a rail back outside which faces away from said rail lips; said fastening rail body having an outside surface which is formed by said rail back outside of said rail back and said longitudinal outsides of said rail longitudinal sides; said outside surface being provided for contact with the concrete of the concrete element; and, said outside surface being provided at least in part with a profiling.

2. The fastening rail of claim 1, wherein: said fastening rail body has a wall thickness (e); said profiling has a depth (f); and, said depth (f) is no more than 70% of said wall thickness (e).

3. The fastening rail of claim 1, wherein: said fastening rail body has an inside surface facing away from said outside surface; said profiling is formed by a plurality of indentations in said outside surface; and, said inside surface is formed as a planar surface.

4. The fastening rail of claim 3, wherein: adjacent ones of said indentations define a center-to-center distance (g); said indentations have a depth (f); and, a ratio of said center-to-center distance (g) of adjacent indentations to said depth (f) of the indentations is between 2 and 6.

5. The fastening rail of claim 1, wherein said profiling of the fastening rail extends continuously over said rail back outside and said longitudinal outsides.

6. The fastening rail of claim 1, wherein: said rail lips each have rail lip insides; and, said fastening rail body carries a second profiling on said rail lip insides.

7. The fastening rail of claim 1, wherein said undercut is formed by at least one of said rail longitudinal sides.

8. The fastening rail of claim 1, wherein: said fastening rail body has a width (b, c) measured parallel to said rail lip outside and perpendicular to the rail longitudinal direction; and, said undercut is formed as a result of said width (b, c) decreasing in at least one portion from said rail back in the direction of said rail lip outside.

9. The fastening rail of claim 8, wherein a greatest width (b) of said fastening rail body in said portion is at least 1.1 times the smallest width (c).

10. The fastening rail of claim 8, wherein a greatest width (b) of said fastening rail body in said portion is at least 1.2 times the smallest width (c).

11. The fastening rail of claim 1, wherein: said fastening rail body has a height (a); and, said fastening rail body has an overall width (b); and, said overall height is between 1.4 times and 1.8 times the height (a).

12. The fastening rail of claim 1, wherein the fastening rail is formed by a one-part curved metal plate.

13. The fastening rail of claim 1, wherein: said fastening rail body has a wall thickness (e); and, said wall thickness (e) is between 1.2 mm and 3.0 mm at least at said rail back.

14. The fastening rail of claim 1, wherein: said fastening rail body has a wall thickness (e); said fastening rail body has an overall width (b); and, a ratio of said wall thickness (e) to said overall width (b) is between 0.03 and 0.08.

14. A concrete element comprising: a fastening rail having one rail back, two rail lips and two rail longitudinal sides which are disposed opposite one another and extend in a rail longitudinal direction; concrete; said rail longitudinal sides each having a first side facing away from said rail back; each of said rail lips extending on said first side of said rail longitudinal sides and projecting toward one another from corresponding ones of said rail longitudinal sides; said rail lips delimiting a slot between each other; said rail lips having a rail lip outside which faces away from said rail back; said fastening rail being configured in an anchorless manner; said fastening rail forming at least one undercut from said rail back in the direction of said rail lip outside; said rail back having a rail back outside which faces away from said rail lips; each of said longitudinal sides having a longitudinal outside; said fastening rail having an outside surface which is formed by said rail back outside and said longitudinal outsides and which is provided for contact with said concrete; the concrete element having a concrete element surface; said outside surface being provided at least in part with a profiling; said fastening rail being embedded into the concrete element; and, said rail lip outside lying flush with said concrete element surface.

15. The concrete element of claim 14 further comprising: armoring which is at a spacing (m) from said concrete element surface; said fastening rail having a height (a); and, said spacing (m) is greater than said height (a).

16. A method for producing a fastening rail from a metal plate, wherein the fastening rail has one rail back, two rail lips and two rail longitudinal sides which are situated opposite one another and extend in a rail longitudinal direction, wherein the rail longitudinal sides each have a first side facing away from the rail back, each of the rail lips extends on the first side of the rail longitudinal sides and projects toward one another from corresponding ones of the rail longitudinal sides, the rail lips delimit a slot between each other, the rail lips each extend on a side of the rail longitudinal sides which faces away from the rail back and project toward one another from the rail longitudinal sides and delimit a slot between them, wherein the rail lips have a rail lip outside which faces away from the rail back, wherein the fastening rail is configured in an anchorless manner and wherein the fastening rail forms at least one undercut from the rail back in the direction of the rail lip outside, wherein the rail back has a rail back outside facing away from the rail lips, wherein the longitudinal sides each have longitudinal outsides, wherein the fastening rail has an outside surface which is formed by the rail back outside and the longitudinal outsides and provided for contact with concrete of a concrete element, wherein the outside surface is provided at least in part with a profiling, the method comprising the steps of: making a profiling in at least one center region of a top side of the metal plate; and, re-shaping the metal plate for forming the rail back, rail longitudinal sides and rail lips of the fastening rail, wherein the rail back is formed at least in part by the center region of the metal plate.

17. The method of claim 16 further comprising the step of, prior to re-shaping the metal plate, making a second profiling in edge regions of the metal plate on an underside which faces away from the top side.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention will now be described with reference to the drawings wherein:

[0026] FIGS. 1 and 2 show perspective representations of a fastening rail;

[0027] FIG. 3 shows a detail in an enlarged sectional representation through the rail back of the fastening rail;

[0028] FIG. 4 shows a detail in an enlarged top view of the rail back of the fastening rail;

[0029] FIG. 5 shows a metal plate blank after producing profilings and prior to the re-shaping process to form a fastening rail; and,

[0030] FIG. 6 shows a schematic sectional representation through a concrete element with a fastening rail embedded therein.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

[0031] FIG. 1 shows a perspective representation of a fastening rail 1 which is provided to be embedded into a concrete element. Objects such as tubes, pipes, facade anchors or the like can be fastened to the fastening rail 1 without bores and dowels having to be inserted into the concrete element. The fastening rail 1 has a rail interior 31 which is open to the surrounding area via a slot 5. A fastening means such as, for example, a screw bolt with a suitable head can be guided and screw-connected through the slot 5. The screw bolt is supported, in this case, on rail lips 4 which extend on both sides of the slot 5 and are advantageously arranged flush with the surface of the concrete element.

[0032] The fastening rail 1 has a rail back 2, to which rail longitudinal sides 3 connect on both sides. In the embodiment, the rail back 2 is realized in a planar manner and extends parallel to the rail lips 4 both in the rail longitudinal direction 6 and in the transverse direction of the fastening rail 1. However, a different, for example arched form of the rail back 2 can also be advantageous. The rail back 2 and the rail longitudinal sides 3 extend in a rail longitudinal direction 6. On the sides remote from the rail back 2, the rail lips 4, which define the slot 5 between them, connect to the rail longitudinal sides 3. In the embodiment, the cross section of the fastening rail 1 is approximately trapezoidal. However, a different cross section can also be advantageous. The rail back 2 and the rail longitudinal sides 3, just as the rail lips 4, are realized in a planar manner and are connected together by means of rounded edges. The roundings 32 and 33 (FIG. 2) of the edges are produced by the bending radius which can be produced in the production process.

[0033] The rail back 2 has an outside 7 which lies remote from the rail lips 4. As is also shown in FIG. 1, the rail longitudinal sides 3 have outsides 8. The rail back 2, the rail longitudinal sides 3 and the rail lips 4 define the rail interior 31. The outsides 8 of the rail longitudinal sides 3 are remote from the rail interior 31. The outside 7 of the rail back 2 and the outsides 8 of the rail longitudinal sides 3 form an outside surface 35. The outside surface 35 is provided for contact with the surrounding concrete in the installed state. In order to improve the anchoring in the surrounding concrete, the outside surface 35 carries a profiling 12. The profiling 12 is formed by a plurality of indentations 13. In the embodiment, the indentations 13 are arranged in a uniform manner and at constant spacings to one another in the rail longitudinal direction 6 and transversely to the rail longitudinal direction 6 such that a regular grid is produced. All the indentations 13 have the same geometry. The profiling 12 is arranged continuously over the entire outside 7 of the rail back 2 and the outsides 8 of the rail longitudinal sides 3 and extends in the rail longitudinal direction 6 up to end sides 35 of the fastening rail 1 which extend transversely to the rail longitudinal direction 6.

[0034] The rail lips 4 have an outside 9 which lies remote from the rail interior 31. The rail lips 4 additionally have an inside 10 which faces the rail interior 31 and on which a second profiling 14 is arranged. In the embodiment, the second profiling 14 is realized as toothing. The second profiling 14 is formed by a plurality of teeth which are arranged consecutively in the rail longitudinal direction 6 and extend transversely to the rail longitudinal direction 6.

[0035] As shown in FIG. 2, the outside 9 of the rail lips 4 is free of profiling and is realized as a smooth, planar outside. The profiling 12 of the rail longitudinal sides 3 extends up to a rounding 32 at which the rail longitudinal sides 3 merge into the rail lips 4. However, a profiling can also be provided on the outsides 9 of the rail lips 4.

[0036] As is also shown in FIG. 2, the rail lips 4 have a width d which is measured transversely to the slot 5 and perpendicularly to the rail longitudinal direction 6. The slot 5 has a width n which is measured in the same direction. The fastening rail 1 has a width c, which is the smallest width of the fastening rail 1, on the rail lips 4. The width c corresponds to the sum of the widths d of both rail lips 4 plus the width n of the slot 5. The rail longitudinal sides 3 are inclined with respect to the rail back 2 at an angle which is less than 90. In the embodiment, the angle is between 70 and 85. As a result, the fastening rail 1 widens from the rail lips 4 in the direction of the rail back 2.

[0037] The fastening rail 1 has a greatest width b on the rail longitudinal sides 3. In the embodiment, the width of the fastening rail 1 decreases continuously from the greatest width b on the rail longitudinal sides 3. The smallest width c is measured on the rail lips 4 at the transition from the rail lips 4 into the rounding 32. The greatest width b, in this case, is measured at the transition from the rail longitudinal sides 3 into a rounding 33. The rail longitudinal sides 3 merge into the rail back 2 with the rounding 33. The rail longitudinal sides 3 extend in a planar manner in the embodiment between the rounding 32 and the rounding 33.

[0038] The fastening rail 1 has a portion 29 in which the fastening rail 1 forms an undercut. The width of the fastening rail decreases in the portion 29 from the greatest width b to the width c on the rail lips 4. In the portion 29, the greatest width b of the fastening rail 1, in this case, is at least 1.1 times, in particular at least 1.2 times the smallest width c.

[0039] The fastening rail 1 has a height a which is measured perpendicularly to the outside 9 of the rail lips 4. In the embodiment, the width b corresponds to the overall width of the fastening rail 1. The overall width b of the fastening rail 1 is advantageously greater than the height a of the fastening rail 1. In an advantageous manner, the overall width b of the fastening rail 1 is less than double the height a. In an advantageous manner, the overall width b of the fastening rail 1 is between 1.4 times and 1.8 times, in particular between 1.5 times and 1.7 times the height a. As a result, a sufficient undercut is achieved on the rail longitudinal sides 3 at a comparatively large angle . It is possible to place the fastening rail 1 in position in a simple manner independently of any armoring to be arranged in a concrete element as a result of the not too large height a of the fastening rail 1.

[0040] The fastening rail 1 has a wall thickness e. The wall thickness e is measured on the rail back 2. In an advantageous manner, the wall thickness e on the rail longitudinal sides 3 and on the rail lips 4 is the same size as on the rail back 2. The wall thickness e is constantwith the exception of the indentations 13 and of the elevations of the second profiling 14. The wall thickness e of the fastening rail 1 is advantageously between 1.2 mm and 3.0 mm. As a result, a sufficient, large degree of stability of the fastening rail 1 is achieved such that large forces are able to be introduced into the fastening rail 1.

[0041] As is also shown in FIG. 2, the rail back 2 has an inside 11 which lies facing the rail interior 31. The inside 11 of the rail back 2 is realized in a smooth and planar manner and without profiling or structure. The inside 11 of the rail back 2 and insides 37 of the rail longitudinal sides 3 form an inside surface 36 of the fastening rail which lies remote from the outside surface 35. The inside surface 36 and the outside surface 35 are oppositely situated sides of the same portion of the metal plate, by means of which the fastening rail 1 is formed. Neither the rail back 2, nor the rail longitudinal sides 3 nor the rail lips 4 include any breakthroughs which extend over the entire wall thickness e. Neither do the rail longitudinal sides 3 nor the rail lips 4 have any breakthroughs which connect the rail interior 31 to the surrounding area on the outside 8 or 9. The rail interior 31 is only connected to the surrounding area via the slot 5 and the end faces 35 of the fastening rail 1.

[0042] FIG. 3 shows the configuration of the indentations 13 of the profiling 12 in detail. As shown in FIG. 3, the indentations 13 have a triangular cross section. As shown in FIG. 3 in conjunction with FIG. 4, the indentations 13 are realized in the form of pyramid-shaped depressions. As shown in FIG. 3, there is a center-to-center distance g between adjacent indentations 13. In the embodiment, the center-to-center distance g is approximately the same size as the wall thickness e. The center-to-center distance g can be advantageously between 0.1 times and 5 times the wall thickness e. The indentations 13 have a depth f which is smaller than the wall thickness e. The depth f is advantageously no more than 70%, in particular no more than 50%, in a preferred manner no more than 40% of the wall thickness e. As a result of a comparatively small depth f of the indentations 13, they are able to be produced simply in a rolling method. The center-to-center distance g is advantageously greater than the depth f of the indentations. In an advantageous manner, the ratio of the center-to-center distance of adjacent indentations to the depth of the indentations is between 2 and 6.

[0043] As shown in FIG. 4, the indentations 13 have a height h which is measured in the rail longitudinal direction 6 and a width i which is measured perpendicularly to the rail longitudinal direction 6. In the embodiment, the height h and the width i are the same size. However, different measurements for the width i and the height h can be advantageous. As is also shown in FIG. 4, the center-to-center distance g in the rail longitudinal direction 6 is the same size as the center-to-center distance g perpendicular to the rail longitudinal direction 6. The indentations 13 are accordingly arranged in a regular manner in the transverse direction and in the rail longitudinal direction 6 of the fastening rail 1. As is also shown in FIG. 4, adjacent indentations 13 are at a distance k to one another. The distance k is advantageously smaller than the wall thickness e of the fastening rail 1 on the rail back 2.

[0044] Instead of the indentations 13, other forms of indentations can also be advantageous for forming a profiling 12. The profiling 12 can also be formed, for example, by knurling or a different surface structuring. The profiling 12 can also be formed by elevations such as, for example, nubs or the like. In an advantageous manner, the height of the elevations is less than 70%, in particular less than 50%, advantageously less than 40% of the wall thickness e. It can also be provided that the profiling 12 is achieved by increased roughness of the surface of the fastening rail 1. If the profiling 12 is formed by increased roughness of the outside 7 of the rail back 2 and of the outside 8 of the rail longitudinal sides 3, the average roughness depth advantageously corresponds to the values given for the depth f of the indentations 13.

[0045] FIG. 5 shows a metal plate blank 15, from which the fastening rail 1 can be formed. The metal plate blank 15 has a longitudinal direction 34 which extends parallel to the rail longitudinal direction 6 once the metal plate blank 15 has been re-shaped to form the fastening rail 1. The metal plate blank 15 has a center region 16 which extends in the longitudinal direction 34. Edge regions 17 are formed on both sides of the center region 16. The metal plate blank 15 has an underside 18 and a top side 19. The designations top side and underside relate to the position shown in FIG. 5 and are fully independent of the position of the metal plate blank 15 in the production process. The underside 18, after the re-shaping process, forms the inside of the fastening rail 1, and the top side 19 forms the outside. The metal plate blank 15 includes the profiling 12 in the center region 16 on the top side 19. The center region 16 is realized in a planar and smooth manner on the underside 18. The edge regions 17 include the second profiling 14 on the underside 18. The edge regions 17 are realized in a smooth and planar manner on the top side 19.

[0046] In the case of a method for producing a fastening rail 1, a metal plate blank 15, which can also be present, for example, as strip stock, can first of all be provided with the profilings 12 and 14. The metal plate blank 15 is then re-shaped, in particular in a cold rolling method. In this case, the center region 16 is bent to the underside 18 parallel to the longitudinal direction 34 in order to form the rail longitudinal sides 3. The metal plate blank 15 is additionally bent around between the center region 16 and the edge regions 17 in order to form the rail lips 4. The sequence of the bending steps is advantageously chosen in a suitable manner.

[0047] FIG. 6 shows a schematic representation of the fastening rail 1 in a concrete element 20. The fastening rail 1 is embedded into the concrete element 20, namely is encased in concrete in the concrete element. As is shown schematically in FIG. 6, the concrete element 20 has armoring 30 which can be realized in an arbitrary known manner. The armoring 30 is at a distance m from a surface 21 of the concrete element 20. The distance m is greater than the height a of the fastening rail 1. The height a and the distance m are measured, in this case, perpendicularly to the surface 21. As a result, the fastening rail 1 does not reach into the armoring 30 with any region such that the position of the fastening rail 1 is able to be chosen independently of the armoring 30.

[0048] The outsides 9 of the rail lips 4 are located flush with the surface 21 of the concrete element 20. The outside surface 35 is in contact with the surrounding concrete of the concrete element 20. A fastening screw 24 is secured to the fastening rail 1. The fastening screw 24 has a head 26 which is arranged in the rail area 31. The head 26 has an underside 27 which is provided with a profiling 28. The profiling 28 engages in the profiling 14 on the inside of the rail lips 4. The geometry of the profiling 28 is advantageously matched to the geometry of the profiling 14. The profilings 14 and 28 can be, for example, meshing teeth. The head 26 is held in a positive locking manner on the fastening rail 1, advantageously in the rail longitudinal direction 6, by the profilings 14 and 28. As a result, high forces are able to be transmitted in the rail longitudinal direction 6.

[0049] A component 22, which is to be fastened on the fastening rail 1 or on the concrete element 20, is arranged on the outside 9 of the rail lips 4. A nut 25, which presses the component 22 against the rail lips 4, is screw-connected to the fastening screw 24. In the embodiment, a shim 23 is arranged between the nut 25 and the component 22. A different arrangement and a different configuration of a fastening element can also be advantageous.

[0050] In the embodiment, the profiling 12 extends over the entire outside surface 35. It can be provided in an advantageous alternative configuration that the profiling 12 only extends over part of the outside surface 35. The profiling 12 is arranged continuously in an advantageous manner in the rail longitudinal direction 6. In an advantageous configuration, the profiling extends at least in part over the outside 7 of the rail back 2. As an alternative to this or in addition to it, it is provided that the profiling extends at least in part over the outside 8 of at least one rail longitudinal side 3, in particular over the outsides 8 of both rail longitudinal sides 3.

[0051] It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.