Abstract
A concrete ceiling element for producing a concrete ceiling is disclosed. The concrete ceiling element has a flat basic structure that has an upper side and at least one FRC plate. The concrete ceiling element has at least one FRC ridge. The FRC ridge is arranged on the upper side and connected in sections to the basic structure. Furthermore, a concrete ceiling and a method for producing a concrete ceiling or a concrete ceiling element are provided.
Claims
1. A concrete ceiling element comprising: a flat basic structure with an upper side and comprising at least one FRC plate; and at least one FRC ridge, wherein the FRC ridge is arranged on the upper side and connected in sections to the basic structure.
2. The concrete ceiling element according to claim 1, wherein the at least one FRC ridge has at least two supports which provide the connection to the basic structure in sections.
3. The concrete ceiling element according to claim 2, wherein a recess is located between the at least two supports.
4. The concrete ceiling element according to claim 1 comprising at least two FRC ridges, the FRC ridges being arranged parallel to one another and/or at an angle of less than 180° and greater than 0°, in particular orthogonally, to one another are.
5. The concrete ceiling element according to claim 4, wherein at least some of the FRC ridges arranged parallel to one another are being arranged equidistant from one another.
6. The concrete ceiling element according to claim 4, wherein some of the FRC ridges arranged parallel to one another are not equidistant from another part of the FRC ridges arranged parallel to one another in such a way that at least one area of higher FRC ridge density is formed.
7. The concrete ceiling element (2) according to claim 1 comprising at least two FRC ridges, wherein at least two of the FRC ridges are arranged at an angle of less than 180° and greater than 0°, in particular orthogonally, to one another, that the at least two FRC ridges intersect at a point of intersection, and the at least two FRC ridges are plugged in at the point of intersection.
8. The concrete ceiling element according to claim 7, wherein the at least two of the FRC ridges each have an opposing groove at the point of intersection and in particular the depth of the grooves in total corresponds to at least the height of the FRC ridges at the point of intersection.
9. The concrete ceiling element according to claim 4, wherein at least three, in particular at least four, of the FRC ridges are arranged to one another in such a way that they enclose a space, which space is at least partially poured out with concrete.
10. The concrete ceiling element according to claim 1, wherein at least one of the FRC ridges is solidly formed and/or at least one of the FRC ridges has at least one cavity, in particular in the form of a slot.
11. The concrete ceiling element according to claim 10, wherein the at least one cavity is provided with a tension element, in particular a tension rod, and in particular is at least partially filled with a filling material, preferably with mortar.
12. The concrete ceiling element according to claim 1, wherein the basic structure comprises at least two FRC-plates which are arranged planar next to one another and are adjacent to one another.
13. The concrete ceiling element according to claim 12, wherein the FRC-plates are at least partially glued along their mutually aligned sides.
14. The concrete ceiling element according to claim 12, wherein at least one connecting element, in particular a connecting patch, is at least partially mounted on the upper side along the mutually aligned sides of the FRC-plates.
15. The concrete ceiling element according to claim 2, wherein: at least one support at the end and facing the upper side has at least one extension, which extension is arranged in a recess of an FRC-plate of the basic structure and is fixed in this recess which is dimensioned larger than the extension; and/or at least one FRC-plate of the basic structure has at least one extension on the upper side, which extension is arranged in a recess at the end and facing the upper side of a support and is fixed in this extension which is dimensioned larger than the recess.
16. The concrete ceiling element according to claim 15, wherein the at least one extension and the recess have the shape of a wedge in cross section, in particular of a wedge with one or with two inclined planes.
17. The concrete ceiling element according to claim 15, wherein the dimension of the recess and the dimension of the extension are coordinated in such a way that the extension can be joined in the transverse direction, in particular in that the recess is made larger at its narrowest point than the extension at its widest point.
18. The concrete ceiling element according to claim 15, wherein both the extension and the recess have the shape of a wedge with only one inclined plane in cross section.
19. The concrete ceiling comprising at least one concrete ceiling element according to claim 1.
20. The concrete ceiling according to claim 19, comprising at least one line which is arranged on the upper side of the basic structure and is guided through at least one recess of an FRC ridge.
21. The concrete ceiling according to claim 19, comprising a cover layer supported on the FRC ridges, in particular a cover layer comprising floor slabs made of wood and/or stone and/or FRC-concrete.
22. A method connecting two FRC concrete elements comprising the steps of providing a push-fit connection; and connecting the two FRC concrete elements with the push-fit connection.
23. A method for producing a concrete ceiling, comprising the steps: providing at least one concrete ceiling element according to claim 1; and arranging at least one line on the upper side of the basic structure and guiding this line through at least one recess of an FRC ridge; and/or supporting a cover layer on the FRC ridges.
24. The method for producing a concrete ceiling according to claim 23, comprising: providing of at least two concrete ceiling elements according to claim 1; and arranging the at least two concrete ceiling elements flat next to one another; in particular adjacent gluing the at least two concrete ceiling elements at least partially along their mutually aligned sides; and/or in particular attaching at least one connecting element on the upper side at least partially along the mutually aligned sides of the flat adjacent and mutually adjacent concrete ceiling elements.
25. The method for producing a concrete floor (1) according to claim 23, comprising: arranging at least one additional FRC ridge on the upper side of the basic structure, in particular at an angle of less than 180° and greater than 0° relative to the at least one already existing FRC ridge of the at least a concrete ceiling element and/or in particular comprising plugging the at least one additional FRC ridge onto the at least one existing FRC ridge.
26. A method for producing a concrete ceiling, comprising: providing at least one FRC-plate for forming a basic structure, in particular an FRC-plate with recesses which have a wedge-shaped cross section; in particular, arranging at least one line on the upper side of the basic structure, preferably in such a way that the recesses remain free; arranging at least one FRC ridge on the upper side of the basic structure, in particular by introducing an extension of the supports of the FRC ridge, each with a wedge-shaped cross section, into a recess and fixing the extension in the recess with the aid of a filling material; supporting a cover layer on the FRC ridge.
27. The method for producing a concrete ceiling according to claim 26, comprising: arranging at least one further FRC ridge on the upper side of the basic structure, in particular at an angle of less than 180° and greater than 0° to the already arranged at least one FRC ridge and/or in particular comprising plugging the at least one additional FRC ridge onto at least one already arranged FRC ridge.
28. The method for producing a concrete ceiling according to claim 26, comprising: providing at least two FRC-plates for forming a basic structure, in particular two FRC-plates having recesses that are wedge-shaped in cross section; arranging the at least two FRC-plates flat next to one another; in particular gluing the at least two FRC-plates at least partially along their mutually aligned sides; and/or in particular, attaching at least one connecting element on the upper side at least partially along the mutually aligned sides of the FRC-plates which are arranged next to one another and adjacent to one another.
29. The method for producing a concrete ceiling element (2) according to claim 1, comprising: providing at least one FRC-plate for forming a basic structure, in particular an FRC-plate with recesses that are wedge-shaped in cross-section; arranging at least one FRC ridge on the upper side of the basic structure, in particular by introducing an extension of the supports of the FRC ridges, each with a wedge-shaped cross section, into a recess and fixing the extension in the recess with the aid of a filling material; in particular, arranging at least one further FRC ridge on the upper side of the basic structure, preferably at an angle of less than 180° and greater than 0° to the at least one FRC ridge already arranged and/or preferably comprising plugging the at least one additional FRC ridge onto the at least one already arranged FRC ridge.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0075] Other advantages and features, which are to be understood not to be limiting, will become apparent from the following detailed description with reference to the drawings. It shows
[0076] FIG. 1a a schematic longitudinal section through a known concrete ceiling;
[0077] FIG. 1b a schematic longitudinal section through a concrete ceiling according to the present disclosure;
[0078] FIG. 2a a schematic longitudinal section through an embodiment of an FRC ridge;
[0079] FIG. 2b a schematic longitudinal section through a further embodiment of an FRC ridge;
[0080] FIG. 2c a schematic longitudinal section through a concrete ceiling element according to the present disclosure;
[0081] FIG. 3a a schematic cross section through an embodiment of a concrete ceiling element according to the present disclosure;
[0082] FIG. 3b a schematic cross section through an embodiment of a concrete ceiling element according to the present disclosure;
[0083] FIG. 3c a schematic cross section through an embodiment of a concrete ceiling element according to the present disclosure;
[0084] FIG. 3d a perspective top view of an embodiment of a concrete ceiling element according to the present disclosure;
[0085] FIG. 4 a perspective top view of an embodiment of a concrete ceiling element according to the present disclosure;
[0086] FIG. 5 a perspective top view of several concrete ceiling elements of an embodiment according to the present disclosure arranged next to one another;
[0087] FIG. 6a a perspective top view of an embodiment of a concrete ceiling element according to the present disclosure resting on ceiling supports;
[0088] FIG. 6b a schematic side view of a ceiling element according to the present disclosure;
[0089] FIG. 6c a schematic top view of a concrete ceiling element according to the present disclosure;
[0090] FIG. 6d a schematic section through a concrete ceiling element according to the present disclosure;
[0091] FIG. 7a a perspective top view of an embodiment of a concrete ceiling element according to the present disclosure with a space filled with binding agent;
[0092] FIG. 7b a perspective top view of a further embodiment of a concrete ceiling element according to the present disclosure with a space filled with binding agent;
[0093] FIG. 8 a perspective top view of two interconnected concrete ceiling elements according to the present disclosure;
[0094] FIG. 9 a perspective top view of a concrete ceiling according to the present disclosure partially provided with a cover layer;
[0095] FIGS. 10a to 10e an embodiment of a method according to the present disclosure for producing a concrete ceiling;
[0096] FIGS. 11a to 11e a further embodiment of a method according to the present disclosure for producing a concrete ceiling;
[0097] FIGS. 12a to 12c a further embodiment of a method according to the present disclosure for producing a concrete ceiling; and
[0098] FIGS. 13a to 13c schematic sections through embodiments of concrete ceiling elements according to the present disclosure having a plug-and-fit connection.
DETAILED DESCRIPTION OF THE DRAWINGS
[0099] A longitudinal section through a known concrete ceiling 0 without a cover layer is shown schematically in FIG. 1a. The concrete ceiling 0 is approx. 300 mm thick and massive. Such a concrete ceiling 0 has a payload of 2 kN/m.sup.2, a permanent load of 2 kN/m.sup.2 and a dead load of 7.5 kN/m.sup.2. This results in a total of 11.5 kN/m.sup.2.
[0100] A longitudinal section through a concrete ceiling 1 according to at least some embodiments without a cover layer is shown schematically in FIG. 1b. The concrete ceiling in this example has the same area as the usual concrete ceiling shown in FIGS. 1a and 1s also about 300 mm thick, but not solid. Rather, the concrete ceiling 1 is composed of several FRC-plates 100, which form a basic structure 10. On the upper side 11 of this basic structure 10, and thus the FRC-plates 100, arranged and connected to these are longitudinal FRC ridges 21 and transversal FRC ridges 22. The longitudinal FRC ridge 21, through which the longitudinal section runs, has three recesses 202 in total and four supports 201 (for the sake of clarity, only one recess and one support are provided with reference symbols). It is the supports 201 which provide the connection between the basic structure 10 and the ridge 20. The concrete ceiling 1 shown further comprises four transversal FRC ridges 22, which are essentially aligned orthogonally to the longitudinal FRC ridges 21 and intersect them, in particular at the level of the supports 201 of the longitudinal FRC ridges 21. Such a concrete ceiling according to at least some embodiments has a payload of 2 kN/m.sup.2, a permanent load of 2 kN/m.sup.2 and a dead load of 1.8 kN/m.sup.2. This results in a total of 5.8 kN/m.sup.2. If one now compares the usual concrete ceiling from FIG. 1a with the concrete ceiling according to FIG. 1b, it quickly becomes clear which enormous advantages the concrete ceiling according to the present disclosure offers. With the same load-bearing capacity, this comes with a fraction of its own weight and thus offers the possibility of building much lighter with the same stability and this with an enormous potential for savings in material.
[0101] A longitudinal section through an FRC ridge 20, which has three recesses 202 and four supports 201, is shown schematically in FIG. 2a. This FRC ridge shall, for example, be a longitudinal FRC ridge in the final construction. In order to be able to accommodate further FRC ridges running orthogonally to this shown FRC ridge 20, the shown FRC ridge 20 has grooves 203 at the level of the supports 201 in order to be able to accommodate an orthogonally aligned FRC ridge therein according to the plug-and-fit principle. The grooves 203 are located in the upper area of the supports 201 and thus represent openings pointing away from the upper side of the basic structure.
[0102] In FIG. 2b, a longitudinal section through an FRC web ridge is shown schematically, which has three recesses 202 and four supports 201 (for the sake of clarity, only one recess and one support are provided with reference symbols). This FRC ridge 20 is intended to be, for example, a transversal FRC ridge in the final construction. In order to be able to be connected according to the plug-and-fit principle with a longitudinal FRC ridge, as shown for example in FIG. 2a, the FRC ridge 20 has grooves 203 in the supports which are matched to the grooves of the longitudinal FRC ridges that the longitudinal and transversal FRC ridges define a flat surface and arranged on the top of the basic structure have one and the same height (for the sake of clarity, only one of the grooves is provided with a reference number). The grooves 203 are located in the lower area of the supports 201 and thus represent openings pointing towards the upper side of the basic structure.
[0103] FIG. 2c shows a schematic longitudinal section through a concrete ceiling element 2 with exclusively parallel FRC ridges 20 attached to the upper side 11 of the basic structure 10. The FRC ridges 20 can be formed without a groove, since they do not have to accommodate other transversal FRC ridges.
[0104] FIG. 3a shows a schematic cross section through an embodiment of a concrete ceiling element 2 according to at least some embodiments. A plug-and-fit connection is shown between an FRC-plate 100, which provides the basic structure 10 with the top 11, and an FRC ridge 20. The cross section runs through the support 201 of the FRC ridge 20, which has an extension 204 in the form of a wedge with only one inclined plane. The FRC-plate 100 in turn has a recess 110 also in the form of a wedge with only one inclined plane. The recess 110 is designed to be sufficiently large so that the extension 204 can be placed in the recess 110 from the top 11. Accordingly, the connection is—for the time being—not a form-fitting connection. In order that a positive fit nonetheless occurs, the cavity between the recess 110 and the extension 204 is at least partially or completely filled with a filling material 31, such as mortar, sand or the like, and thus wedged.
[0105] FIG. 3b shows a schematic cross section through an embodiment of a concrete ceiling element 2 according to at least some embodiments. In contrast to the embodiment of FIG. 3a, the extension 204 and the recess 110 are modelled on the shape of a wedge with two inclined planes. The wedge that inspires this shape is shown in a dashed line.
[0106] FIG. 3c shows the same cross section through the concrete ceiling element 2 as FIG. 3a, but the wedge with only one inclined plane is shown in dashed lines, on the shape of which the extension 204 of the support and the recess 110 are oriented.
[0107] FIG. 3d shows a perspective top view of an embodiment of a concrete ceiling element 2 according to at least some embodiments. As in FIG. 3a, also in FIG. 3b a plug-and-fit connection between an FRC-plate 100, which provides the basic structure 10 with an upper side 11, and an FRC ridge 20 is shown. The extension 204 of the support 201 of the FRC ridge 20 is let into an elongated recess 110 in the FRC-plate 100, which is part of the basic structure 10 with the surface 11. The elongated recess 110 and the elongated extension 204 both have a cross section in the form of a wedge with only one inclined plane and are connected to one another by a filling material 31.
[0108] FIG. 4 shows a perspective top view of an embodiment of a concrete ceiling element 2 according to at least some embodiments. Its basic structure 10 consists of an FRC-plate 100, on the upper side of which, which upper side is identical to the upper side 11 of the basic structure 10, two FRC ridges 20 are arranged. These FRC ridges 20 are aligned parallel to one another and constructed identically to one another. Each FRC ridge 20 has twelve arcuate recesses 202 and thirteen supports 201 (for the sake of clarity, only one recess 202 and one support 201 for one of the two FRC ridges 20 are provided with reference symbols). Such a concrete ceiling element 2 can be used to produce a concrete ceiling, the FRC panel 100 serving as lower sheating and tension flange and the FRC ridges 20 acting as a compression flange.
[0109] The FRC-plate 100 of the basic structure 10 and the FRC-plate(s) (not shown) from which the FRC ridges 20 are cut have been prestressed, for example, only in the longitudinal direction or in the longitudinal and transverse directions. Usually neither the longitudinally tensioned with the transversely tensioned fibers nor the longitudinally tensioned fibers or the transversely tensioned fibers are connected to one another. The fibers for longitudinal tensioning and the fibers for transverse tensioning can be arranged in several layers. Tensioning is carried out with fibers (e.g. made of carbon, glass, Kevlar, basalt, steel, natural fibers etc.), whereby the term “fiber” includes both a single or several elongated and flexible reinforcement elements, e.g. single filaments, multifilaments, fiber bundles (e.g. stranded or twisted), wires, or one or more rovings (typically comprising 2000 to approx. 16000 filaments). The net cross-sectional area of the fibers (i.e. without resin impregnation) is e.g. less than approx. 5 mm.sup.2 and in particular lies in a range from approx. 0.1 mm.sup.2 to approx. 1 mm.sup.2. The tensile strength of the fibers in relation to their net cross-sectional area is, for example, greater than approx. 1000 N/mm.sup.2, in particular greater than approx. 1800 N/mm.sup.2. The elastic tensile strength of the fibers is, for example, greater than approx. 1%. In one example, the fibers, in particular carbon fibers, can be tensioned with a tension of approx. 50% to approx. 95%, in particular of at least approx. 80%, in particular at least approx. 90%, of the tensile breaking strength of the fibers. For example, the reinforcement distance (=distance between two adjacent fibers) is approx. 5 mm to approx. 40 mm, in particular approx. 8 mm to approx. 25 mm, and/or the FRC-plate comprises at least 10, in particular at least 40, fibers. For example, the reinforcement spacing is less than or equal to twice the height of the FRC-plate. The reinforcement content of an FRC-plate is, for example, more than 20 mm.sup.2/m width. For example, a tension of at least approx. 30 kN/m or at least approx. 300 kN/m is generated during prestressing, depending on the load requirements on the FRC-plate (dimensioning force).
[0110] FIG. 5 shows a perspective top view of four concrete ceiling elements 2 of the same embodiment arranged next to one another. Each concrete ceiling element 2 has three mutually parallel and identically designed FRC ridges 20 which extend along the entire length of the respective FRC-plate 100 on which they are arranged and terminate flush with one of their supports. The total of four FRC-plates 100 are arranged flush and each end supported on a side wall. On the adjoining sides, mutually adjacent FRC-plates 100 are connected to one another. In the example shown here, a binding agent is applied along the contact surface of the adjoining sides of the FRC-plates 100 (not shown in the figure). The three FRC ridges 20 are each arranged on the FRC-plates 100 in such a way that placing several FRC-plates 100 next to one another results in a large FRC-plate with equidistant and parallel arranged FRC ridges 20.
[0111] FIG. 6a shows a perspective top view of an embodiment of a concrete ceiling element 2 according to at least some embodiments, which rests on ceiling supports (in the section shown, a ceiling support can be seen at the front right). The concrete ceiling element 2 has both longitudinal FRC ridges 21 and transverse FRC ridges 22. The longitudinal FRC ridges 21 end flush with the FRC-plate 100 with a support, while the transverse FRC ridges 22 end with a recess flush with the FRC-plate 100. The transverse FRC ridges 22 are arranged equidistant from one another, while the longitudinal FRC ridges 21 have an area 25 with an equidistant but wider arrangement and an area 26 with an equidistant but narrower arrangement. In the example shown, the area 26 of the narrower FRC ridge arrangement provides for a longitudinal reinforcement over the ceiling supports. On the adjoining sides, adjacent FRC-plates 100 are connected to one another by gluing a lamella as a connecting element 32 over the entire length of the FRC-plates 100 along the contact surface of the adjoining sides. Thanks to the FRC ridges 22, which also run in the transverse direction, and the glued-on connecting strips 32, ceilings can be built with any free span in both directions, although the individual FRC-plates 100 are usually limited in width in one direction (due to transport).
[0112] FIG. 6b shows a schematic side view of a ceiling element 2 according to at least some embodiments, whereas FIG. 6c shows a schematic top view of this concrete ceiling element 2. A longitudinal FRC ridge 21 can be seen, which is arranged on an FRC-plate 100. Two transverse FRC ridges 22 can also be seen. In order to enable the transverse FRC ridges 22 to be plugged onto the longitudinal FRC ridge 21, the latter has an upwardly open groove 203 at the interfaces. The grooves 203 are made wider than the transverse FRC ridges 22 are wide. Accordingly, a cavity is created to the left and right of the transverse FRC ridges 22 at the interfaces, which cavity is at least partially filled with a filling material 31, such as mortar, in order to establish a connection between longitudinal and transverse ridges 21, 22 which can absorb tensile forces.
[0113] FIG. 6d shows a schematic section through a concrete ceiling element 2 according to at least some embodiments. More precisely, it is a cross section which goes through an FRC ridge, here a longitudinal FRC ridge 21, oriented in a first direction. Also to be seen is a section through one of the FRC ridges 22 running transversely to this longitudinal FRC ridge 21, which appears to be divided into two parts by the longitudinal FRC ridge 21. The FRC ridges 21, 22 are arranged on an FRC-plate 100. The longitudinal FRC ridge 21 has a cavity 205 into which two reinforcements 33 in the form of reinforcing rods are inserted and cast with a filling material 31. Such a design enables high tensile forces to be absorbed. Optionally, such reinforcements 33, as indicated here by dashed lines, can also run crosswise. In other words, not only the transverse FRC ridge 21 but also the longitudinal FRC ridge 22 has a cavity (not visible in this illustration) in which there are, for example, two reinforcing rods cast in a filling material (indicated by dashed lines). So that longitudinal and transverse reinforcements do not interfere with each other, they are preferably arranged in different levels.
[0114] FIG. 7a shows a perspective top view of an embodiment of a concrete ceiling element 2 according to at least some embodiments. The FRC ridges 20 are arranged in relation to one another in such a way that they form a type of cassette structure which has individual spaces 30 delimited by the FRC ridges 20. In order to enable the construction of further floors, the concrete ceiling to be formed on the concrete ceiling element 2 shown can be reinforced by, for example, filling individual spaces 30 with a binding agent 31, such as concrete, and thus forming punctual reinforcements.
[0115] FIG. 7b shows a perspective top view of an embodiment of a concrete ceiling element 2 according to at least some embodiments, comparable to that shown in FIG. 7a. The punctual reinforcement by filling a space 30 with concrete 31 is cut here.
[0116] FIG. 8 shows a perspective top view of two interconnected concrete ceiling elements 2 according to at least some embodiments, the connection of which is achieved both by means of a connecting element 32 fixed by a binding agent and by gluing the mutually aligned sides of the adjacent FRC-plates 100 that are aligned with one another. The longitudinal FRC ridges 21 are oriented such that they run parallel to the contact surface of the adjoining sides of the FRC-plates 100, whereas the transverse FRC ridges 22 are oriented such that the contact surface of the adjoining sides of the FRC-plates 100 is spanned by one of the recesses 202. Correspondingly, the connecting element 32 is laid through the congruent, arc-shaped recesses 202 of the transverse FRC ridges 22 that form a row.
[0117] FIG. 9 shows a perspective top view of a concrete ceiling 1 according to at least some embodiments partially provided with a cover layer 50. From the surface 11 of the basic structure of the visible concrete ceiling element 2, longitudinal FRC ridges 21 and transverse FRC ridges 22 are arranged, some of which have a cavity 205 in the shape of a slot. The cavities 205 are open at the top, i.e. their opening points away from the upper side 11, so that tension elements (e.g. reinforcing iron, FRCK rods or the like) can be inserted from above and cast with a binding agent, such as mortar, in order to provide an additional reinforcement. The cavities 205 shown here are not (yet) filled with tension element and mortar. A covering layer 50 can be applied to the plane formed by the FRC ridges 21, 22 by, for example, parquet boards being supported on the FRC ridges 21, 22.
[0118] A method according to at least some embodiments for producing a concrete ceiling 1 is illustrated with the aid of the perspective top views shown in FIGS. 10a to 10e. In a first step shown in FIG. 10a, several concrete ceiling elements 2 (here four in number) are provided on a framework, for example formed by wooden struts and ceiling supports. These concrete ceiling elements 2 are then aligned with one another in a second step, as can be seen in FIG. 10b, in such a way that they form a large area (here a large rectangle) and are arranged flush with one another in all spatial directions. To fix the relative position of the individual concrete ceiling elements 2 to one another, they are then at least partially glued to one another (not shown). Since the provided concrete ceiling elements 2 were only provided with longitudinal FRC ridges 21, in a further step, as shown in FIG. 10c, transverse FRC ridges 22 are arranged on the upper side 11 in order to achieve reinforcement. The transverse FRC ridges 22 are, for example, plugged onto the already existing longitudinal ridges 21, e.g. by means of grooves which are present in the longitudinal FRC ridges 21 and transverse FRC ridges 22 and which are aligned with one another. In order to achieve a stronger connection than a pure plug connection, extensions located on the supports of the transverse FRC ridges 22 can be embedded in recesses 110 located on the upper side 11 of the basic structure and fixed therein by filling with a binding agent such as mortar. Then, as can be seen in FIG. 10e, the framework can be removed and the ceiling only rests on the definitive support points, here ceiling supports. However, this step can also be carried out later, e.g. after the lines 40 have been laid or even only after the cover layer 50 has been arranged. In the subsequent step illustrated with reference to FIG. 10d, which, however, can also be carried out before the step of attaching the transverse FRC ridges 22, various lines 40 are laid. These lines 40 are arranged on the upper side 11 of the basic structure 11 and passed through the recesses 202 of the FRC ridges 21, 22. Once at least some of the lines 40 have been laid, the application of the cover layer 50 and thus the completion of the production of the concrete ceiling 1 can begin.
[0119] Another method according to at least some embodiments for producing a concrete ceiling 1 is illustrated with the aid of the perspective top views shown in FIGS. 11a to 11e. In a first step, at least one FRC-plate 100 is provided. If several FRC-plates 100 are provided (here there are four in number, as shown in FIG. 11a), these FRC-plates 100 are aligned flush with one another in such a way that a large (mostly rectangular) area is created. In order to connect the individual FRC-plates 100 to one another, they are glued along the contact surfaces of adjacent FRC-plates 100, as shown in FIG. 11b. For this purpose, on the one hand, a binding agent can be applied directly to the contact surfaces and, on the other hand, alternatively or additionally a connecting element 32, such as a lamella, can be glued to the upper side 11 along the contact surfaces of adjacent FRC-plates 100. In the next step shown in FIG. 11c, lines 40 are laid. If this step takes place before the FRC ridges are arranged, the lines 40 should be laid in such a way that they do not collide with the points that are intended for fastening the FRC ridges 20 to be arranged later. Such locations can be, for example, recesses 110 for receiving the supports of the FRC ridges 20. In the embodiment shown, these are regularly distributed over the individual FRC-plates 100 and are designed in the shape of a cross when viewed from above. The step shown in FIG. 11d, which can alternatively also be carried out before the laying of the lines 40, comprises the attachment of FRC ridges 20 on the upper side 11 of the basic structure 10 formed, among other things, by the FRC-plates 100. Ridges of one orientation (for example longitudinal FRC ridges 21) attached and then FRC ridges of a different orientation (for example transverse FRC ridges 22). In addition to known types of fastening, such as, for example, screwing, the FRC ridges 20 can be attached in particular by means of the plug-and-fit connection already described (see FIGS. 3a and 3b). It can be clearly seen that the cross-shaped arrangement of the FRC ridges 21, 22 gives the basic structure 10 sufficient stability so that only four carriers or supports, one per corner, are required to support the basic structure 10. The basic structure 10 would, however, also be sufficiently stable to only stand on three supports in the form of three carriers. The remaining roof supports can be removed (see FIG. 11e, in which the scaffolding is no longer present). In order to be able to reasonably attach crossing FRC ridges 21, 22, these preferably have interacting means which enable them to be plugged into one another or onto one another. Such means can be generally complementary shapes such as aligned grooves or complementary projections and recesses. In a last step shown in FIG. 11e, a cover layer 50 is then supported on the FRC ridges 20 in order to complete the production of the concrete ceiling 1.
[0120] With the aid of FIGS. 12a to 12c, partial steps of an embodiment of a method according to at least some embodiments for producing a concrete ceiling, and thereby also the structure of a concrete ceiling element 2 according to at least some embodiments, are illustrated. FIG. 12a shows a basic structure 10 with upper side 11, which is composed of three FRC-plates 100 arranged next to one another. The FRC-plates 100 are connected to one another via connecting elements 32 attached to the upper side 11. The FRC-plates 100 have recesses 110 for the receiving of supports or the extension, respectively the extensions of the supports of FRC ridges. Since this is a side view and the recesses 110 in this embodiment do not extend through the entire length of the FRC-plates 100 (which may well be the case in other embodiments), these are only shown in dashed lines to clarify their offset in the plane of the drawing. After connecting the individual FRC-plates 110 to one another, two longitudinal FRC ridges 21 per FRC-plate 100 are arranged, preferably by means of a plug-and-fit connection with the aid of the indicated recesses 110 and the extensions 201 of the supports of the FRC ridges 21. For the sake of clarity, only one extension 204 is provided with a reference number. The extensions 201 are also shown in dashed lines, since they are mapped into the image plane. In order to now arrange the transverse FRC ridges 22, these can be inserted in individual fragments between the already existing longitudinal FRC ridges 21. The fragments are held in place, for example, by gluing them to the adjacent longitudinal FRC ridges 21, for example with the aid of a filling material or binding agent, such as mortar or the like. However, the fragments can, for example, also have a conical shape at the end, i.e. pointing in the direction of the adjoining longitudinal FRC ridges 21, and can thus be properly clamped between the longitudinal FRC ridges 21. The conical shape is shown, for example, in the transverse FRC ridge 22 on the left in the figure. Here, a gap remains in the lower area near the upper side 11, which, although it could be filled with a filling material, can just as easily remain free. Furthermore, the fragments of the transverse FRC ridges 22 are arranged over their supports or the extensions 201 of these supports, preferably by means of plug-and-fit connections on the FRC-plates 100. For the sake of clarity, only one extension 204 is provided with a reference number. The recesses 110 in which they are inserted are not shown in FIGS. 12a and 12b and are only once provided with a reference number in FIG. 12c.
[0121] In FIGS. 13a to 13c, various variants of the plug-and-fit connection are shown on the basis of sections through concrete ceiling elements 2 according to at least some embodiments. The plug-and-fit connection is used to connect an FRC ridge 20 in sections to the basic structure 10. The basic structure 10 has an upper side 11 and comprises at least one FRC-plate 100. The FRC-plate 100 in turn has at least one recess 110 which, in the examples shown here, has a wedge shape in cross section and is open towards the upper side 11. The extension 204 of a support of the FRC element 20, likewise wedge-shaped in cross section, protrudes into the recess 110. The size of the recess 110 is selected so that the extension 204 can be introduced into it from the upper side 11. In order to obtain a non-positive connection, the extension 204 is fixed in the recess 110, with the help of a filling material 31. In addition to agents such as mortar, sand, etc., a simple plate with a rectangular cross section (see FIG. 13a), for example, a wedge (see FIG. 13c) or two preferably oppositely aligned wedges (see FIG. 13b) can be used to clamp the extension 204 in the recess 110 and thus connect the FRC ridge 20 to the basic structure 10.
REFERENCE SIGNS LIST
[0122] 0 Concrete ceiling, known [0123] 1 Concrete ceiling [0124] 2 Concrete ceiling element [0125] 10 Basic structure [0126] 11 Upper side [0127] 20 FRC-ridge [0128] 201 Support FRC-ridge [0129] 202 Recess FRC-ridge [0130] 203 Groove FRC-ridge [0131] 204 Extension of support FRC-ridge [0132] 205 Cavity [0133] 21 Longitudinal FRC-ridge [0134] 22 Transversal FRC-ridge [0135] 25 Area wide arrangement [0136] 26 Area narrow arrangement [0137] 30 Space [0138] 31 Filling material [0139] 32 Connecting element [0140] 33 Reinforcement [0141] 40 Line [0142] 50 Covering layer [0143] 100 FRC-plate [0144] 110 Recess
[0145] While the above describes certain embodiments, those skilled in the art should understand that the foregoing description is not intended to limit the spirit or scope of the present disclosure. It should also be understood that the embodiments of the present disclosure described herein are merely exemplary and that a person skilled in the art may make any variations and modification without departing from the spirit and scope of the disclosure. All such variations and modifications, including those discussed above, are intended to be included within the scope of the disclosure.
