System for connecting a wooden support element to a concrete element

Abstract

System (10) for connecting a timber support element (4) to a concrete element (5) comprising a first connecting element (1) and a second connecting element (2), wherein the first connecting element (1) includes a first base element (11), wherein the first base element (11) comprises a first base body (12), wherein the first base body (12) is designed for receiving in the concrete element (5), characterized in that the first base body (12) is designed as a shell comprising a shell base and shell walls and a shell opening opposite the shell base, wherein the shell base and the shell walls are designed to prevent the ingress of flowable concrete into the shell during the assembly of the first connecting element (1), wherein a plurality of first engagement elements (13) are arranged in the shell, wherein the first engagement elements (13) extend from the shell base towards the shell opening.wherein the second connecting element (2) includes a second base element (21), wherein the second base element (21) comprises a second base body (22), wherein the second base body (22) includes a plurality of second engagement elements (23) which are designed as recesses in the second base body (22), wherein the first connecting element (1) can be connected to the second connecting element (2) such that the first engagement elements (13) are at least partially received in the second engagement elements (23) when the first connecting element (1) and the second connecting element (2) are connected to each other.

Description

BackgroundThe present invention relates to a system for connecting a wood carrier element to a concrete element. Such a system is also referred to as a wood concrete composite. The concrete element lies on the wood carrier element or vice versa, wherein the concrete element is connected to the wood carrier element.Prior ArtIt is known to connect a wooden beam to the concrete floor by means of threaded screws for the transmission of shear forces occurring between the wooden beam and the concrete floor. The threaded screw can be screwed into the wooden beam in such a way that a part of the same is subsequently poured into the concrete of the concrete floor. The concrete floor is hereby produced on site. Such a solution is shown, for example, in DE 19 602 400 A1. DE 90 17 564 U describes a wood-concrete composite ceiling which has reinforced concrete cams and profiled head bolts or angle hooks for forming a shear-resistant connection between the wood beam which absorbs the tensile forces and the pressure plate made of concrete which absorbs the compressive forces. For the concrete cams, cylindrical milled-out portions are provided in the wooden beam. The profiled head bolt or angle hook connects the pressure plate via the concrete cam to the wood beam lying underneath. The profiled head bolt or angle hook is cast into the pressure plate. The production of this shear-resistant connection requires a multiplicity of working steps. In addition, the pressure plate is produced at least partially on site, which adds the drying times for the concrete. This solution is therefore unsuitable if the completion of the building is to take place within the shortest possible time period.DE 10 2009 008 720 A1 and EP 2 216 455 B1 show a device for producing a bore in a concrete floor, which device serves for receiving a threaded screw that serves for connection to a wooden beam. The threaded screw is arranged in a recess of the concrete ceiling. This threaded screw can be mounted after the concrete floor has been placed on the wooden beam. The wood structure can thus be connected to a prefabricated concrete ceiling at the construction site. According to DE 10 2006 043 209 A1, a base plate with empty tubes is shown, which serve to accommodate connecting screws. The empty tubes are not orthogonal to the base plate, but are arranged at an angle of 30 to 60 degrees such that the screw paths remain free of intersections.A disadvantage of this known device is the possible displacement of the connecting element relative to the wood carrier element, since the connecting element only rests on the wood carrier element. Thus, during assembly, it is to be ensured that the concrete element does not shift relative to the wood carrier element, that is to say this solution requires precise adjustment of the concrete element relative to the wood carrier element arranged beneath it, so that any incorrect positions do not lead to assembly errors. According to DE 10 2004 024 316 A1, a multi-part connector for fastening a wall element to a concrete subgrade can be provided, by means of which an adjustment of the concrete element and a wood carrier element is easily made possible. The two-part connector has a base part and an anchor part. The base part is a trough which is screwed onto the concrete base. A resin is filled into the trough, into which hook elements of the anchor element dip. When the resin cures, a firm connection is obtained between the base part and the anchor part. The anchor part is connected to a wood carrier beam via a screw connection. A disadvantage of this connector is the remaining distance between the wood support beam and the concrete element after assembly due to the height of the trough. The wood carrier beam thus does not lie flat on the concrete element, so that the connector must absorb all tensile or compressive forces. Alternatively, before the anchor part is assembled, a groove can be provided in the wood carrier beam, which serves to receive the connector, but this is associated with additional work.DE 10 2005 040 388 A1 proposes a composite foot, i.e. a wood or metal element which is inserted into the concrete element and is suitable for receiving connecting elements, such as screws, for example, such that sufficient force transmission of the connection of the wood beam to the concrete element can be ensured and at the same time a planar bearing of the wood beam on the concrete element is made possible. However, the wooden beam to be connected to the concrete element via the composite foot must be positioned exactly. The wooden beam can be displaced as desired before being screwed to the composite foot. Therefore, during assembly, it is to be ensured that the wooden beam does not slip, i.e. is attached to the composite foot in the exact assembly position without measurement errors. Instead of a composite foot, a mounting block can also be provided, as described in DE 10 2015 220 431 A1.There is therefore a need for a system for connecting a wood carrier element to a concrete element, which system comprises a first and second connecting element, which can be connected to the wood carrier element during the assembly of the concrete element, wherein a relative movement from the wood carrier element to the concrete element can be prevented and the corresponding first and second connecting element remains in the correct assembly position and the assembly of at least partially prefabricated systems can take place quickly and easily on a construction site without appreciable time outlay.Object of the InventionIt is the object of the invention to develop a system for connecting a wood carrier element to a concrete element, by means of which the production of a wood-concrete composite component can be simplified, in that at least partially prefabricated system components or modules can be installed on the construction site without great time expenditure. In addition, the system should be able to be produced easily and cost-effectively by using cost-effective connecting elements.DESCRIPTION OF THE INVENTIONThe object of the invention is achieved by a system for connecting a wood carrier element to a concrete element, comprising a first and a second connecting element according to one of claims 1 to 10.When the term "for example" is used in the following description, this term refers to embodiments and / or embodiments, which is not necessarily to be understood as a more preferred application of the teachings of the invention. Similarly, the terms "preferably", "preferred" are to be understood as referring to an example from a set of embodiments and / or embodiments, which is not necessarily to be understood as a preferred application of the teaching of the invention. Accordingly, the terms "for example", "preferably" or "preferred" can refer to a plurality of exemplary embodiments and / or embodiments.The following detailed description contains various exemplary embodiments of the system according to the invention. The description of a particular system is to be considered as exemplary only. In the specification and claims, the terms "include", "comprise", "have" are interpreted as including, but not limited to.".A concrete element can comprise any desired plate-shaped or beam-shaped concrete element which can be used as a ceiling, wall, carrier element, connecting element or floor. In particular, the concrete element can contain at least one prefabricated concrete element. Concrete can be understood to mean a high-strength concrete, normal concrete, foamed concrete, asphalt concrete, lightweight concrete, prestressed concrete, composite concrete, reinforced concrete. The concrete element may comprise reinforcements, reinforcing bars, mats, reinforcing irons.A wood carrier element is understood to mean a beam-shaped or plate-shaped wood component, for example a wood carrier beam or at least one wood plate. The wood carrier element can be made from a single tree trunk, for example hardwood or conifer wood. The wood carrier element may comprise sandwich timber, plywood, sandwich timber, cross-glued timber materials, cross-glued board plies, multi-layer boards, OSB boards, veneer laminated timber, chipwood, chipboards, veneer strip timber, board pile elements. The wood carrier element can itself be designed as a composite component, for example as a wood-concrete composite component, wood-cement composite component, wood-plastic composite component. The wood carrier element can have a rectangular cross section; alternatively, an I-carrier or T-carrier can be used.The wood carrier element can have a width and a height of 10 to 40 cm inclusive. The length of the wood carrier element can be up to 15 m.The concrete element may have a thickness of 5 to 20 cm inclusive. The thickness corresponds to the height HB according to the exemplary embodiments below. For special constructions such as halls, bridges or the like, the thickness of the concrete element can also be substantially greater than 20 cm. The concrete element can in particular have a length of up to 15 m. The concrete element can have a width of up to 5 m, so that transport with means of transport is easily possible.A system for connecting a wood support member to a concrete member includes a first connecting member and a second connecting member, the first connecting member including a first base member, the first base member comprising a first base body. The first base body is designed to be received in the concrete element, wherein the first base body is designed as a shell which contains a shell base and shell walls and a shell opening opposite the shell base. The shell bottom and the shell walls are configured to prevent the ingress of flowable concrete into the shell during assembly of the first connection element. In particular, the first connecting element is arranged in the concrete element in such a way that the shell opening is arranged substantially parallel to the surface of the concrete element or protrudes slightly beyond the surface of the concrete element. A plurality of first engagement elements are arranged in the shell, which project beyond the first base body. That is, the plurality of first engagement elements extend from the tray bottom in the direction of the tray opening. The second connecting element contains a second base element, wherein the second base element comprises a second base body, wherein the second base body contains a plurality of second engagement elements, which are formed as recesses in the second base body. The first connecting element is connectable to the second connecting element in such a way that the first engaging elements are at least partially accommodated in the second engaging elements when the first connecting element and the second connecting element are connected to one another, i.e. the first connecting element is in engagement with the second connecting element.In particular, the second connecting element can be connected to the wood carrier element by means of a fastening device, wherein the fastening device is designed for engagement in the wood carrier element. The fastening device can comprise at least one element from the group consisting of mandrel elements, nail elements, screw elements, screw elements, adhesives.According to one exemplary embodiment, the first engagement elements are designed as projections which are designed for being received in the second engagement elements which are designed as recesses. In particular, the first engagement elements can be designed as pin elements, tabs or pin elements. For example, the first engagement elements can comprise at least one element from the group of truncated cones or truncated pyramids. The second engagement elements can correspond in terms of their shape and dimensions to the first engagement elements, such that the first engagement elements can be received in the second engagement elements. The first engagement elements can also comprise tabs. The brackets may include recesses to receive reinforcement elements or stabilizing elements that may be incorporated into the concrete element for reinforcement or stabilization.According to an embodiment, at least one of the first or second connection elements comprises a protective layer. In particular, the protective layer can be provided if the first or second connecting element is not connected to the concrete element or the wood carrier element. In particular, the first connecting element can be accommodated in the concrete element in such a way that only the first engagement elements are located on the surface. The protective layer can serve for protecting the first connecting element cast into the concrete element by the first engagement elements thereof being covered by the protective layer. The protective layer is not removed until the first engagement elements come into contact with the second engagement elements of the second connection element. The second engagement elements can also be provided with such a protective layer. In particular, the protective layer may include an adhesive layer, which may include an adhesive, wherein the protective layer may be at least partially removable from the first or second connection element. According to one exemplary embodiment, the protective layer is formed by the first connecting element. According to one exemplary embodiment, the protective layer is formed by the second connecting element.According to an embodiment, the first connecting element can be accommodated in the concrete element in such a way that the second connecting element is located on the surface. According to this exemplary embodiment, the first connecting element is connected to the second connecting element. In other words, the second connecting element forms the protective layer for the first connecting element when the first connecting element is cast into the concrete element. When the first connecting element is located in the prefabricated concrete element, the second connecting element can be removed from the first connecting element again. The connection point thus remains free of impurities. The second connecting element can be positioned and fastened on the wood carrier element at the desired location. Thereafter, the concrete element with the first connecting element or elements is connected with the associated second connecting element or elements of the wood carrier element, whereby the concrete element is mounted exactly in the correct position on the wood carrier element. A plug connection is thus produced by the first and second engagement elements of the first and second connection elements. The concrete element can no longer be displaced with respect to the wood carrier element, since the plug connection, which is formed by the first and second connecting elements, results in an exact and rapid positioning of the concrete element on the wood carrier element or an exact positioning of a wood carrier element on a concrete element.According to an embodiment, the first connecting element contains a sleeve element which can be connected to the first base element in such a way that a sleeve element channel formed by the sleeve element is arranged corresponding to an opening of the first base element. The first connecting element may include a sleeve element extending from the shell bottom in the direction opposite the engagement elements. The sleeve element serves for the attachment of an additional connecting means, for example a pin, a nail, a screw, if an additional fixing of the concrete element and the wood carrier element is desirable. In particular, the sleeve element can have a height HH measured from the first base body. The first engagement elements may have a maximum height HE. In particular, the height HH of the sleeve element can be greater than the maximum height HE of each of the first engagement elements. In particular, the height HHof the sleeve element can correspond to the distance of the intersection point of a central axis of the sleeve element with the cross-sectional area of the free end of the sleeve element from the intersection point of the central axis with the surface of the first base body. The sleeve element has an end which rests on the first base body and is arranged opposite the free end. The end of the sleeve element resting thereon can be connected in particular to the first base body.According to an embodiment, the sleeve element has a height which corresponds at least to the thickness of the concrete element, so that the sleeve element extends through the concrete element. According to an embodiment, the sleeve element can protrude beyond the concrete element after completion. In particular, the sleeve element may have a central axis, wherein the angle that the central axis encloses with the surface of the first base element is in the range from 30 degrees to 90 degrees inclusive.According to one exemplary embodiment, the first connecting element and the second connecting element contain a plastic. In particular, the first and second connecting elements can consist of a plastic. For example, the plastic can contain a polyamide or consist of polyamide. The plastic can contain a reinforcement, for example a fiber-reinforced plastic can be used. In particular, the plastic can contain glass balls. The first connecting element and the second connecting element can be formed as injection molded parts.A method for connecting a wood carrier element to a concrete element comprises the following steps: a first connecting element is connected to the concrete element. The first connecting element contains a first base element, wherein the first base element comprises a first base body, wherein a plurality of first engagement elements are arranged on the first base body, wherein the first connecting element is positioned in a formwork for the concrete element at the position at which the wood carrier element is located in the installed state, such that the first engagement elements, when the concrete element is joined to the wood carrier element, engage with second engagement elements of a second connecting element located on the wood carrier element, such that the position of the wood carrier element relative to the concrete element is fixed.In particular, the first connecting element can be concreted into the concrete element, wherein at least the first engagement elements are located on a surface of the concrete element before the concrete element is positioned on the wood carrier element. In particular, the first engagement elements can be protected by a protective layer. In particular, the protective layer can be formed by the second engagement elements. The protective layer may be removed before the concrete element is positioned on the wood carrier element.A sleeve element can be connected to the first base element in such a way that a sleeve element channel formed by the sleeve element is arranged corresponding to an opening of the first base element. In particular, the sleeve element can have a height which corresponds at least to the thickness of the concrete element, such that the sleeve element extends through the concrete element. The sleeve element can project beyond the concrete element after completion.A connecting means can be guided through a bore of the concrete element or the sleeve element channel formed in the sleeve element, which is connected to the wood carrier element as soon as the concrete element is positioned in the desired position on the wood carrier element.The first connecting element contains a first base element, wherein the first base element comprises a first base body. The base body can be designed as a plate-shaped element.In particular, the first engagement elements can be designed as projections which are designed to be received in the second engagement elements of the second connecting element or elements. The second engagement elements are formed as recesses. The first connecting element can comprise retaining elements which can be designed for engagement with the concrete element. The second connecting element can comprise retaining elements which can be designed for engagement in the wood carrier element. In particular, the holding elements can extend into the space bounded by the formwork and fillable with concrete, so that the holding elements can be accommodated in the concrete when the formwork space is filled with concrete.According to one method variant, the first base body contains a first surface and a second surface, wherein the first surface is arranged opposite the second surface. On the first surface, as described above, the first engagement elements configured as projections can be arranged. On the first surface, a protective layer may be temporarily applied, which is removed before the concrete element is positioned on the wood carrier element, in particular before the first connection element is positioned on the corresponding second connection element applied on the wood carrier element.According to a method variant, a connecting means can be guided through a bore of the concrete element or the sleeve element channel formed in the sleeve element, which is connected to the wood carrier element as soon as the concrete element is positioned in the desired position on the wood carrier element.According to one exemplary embodiment, the holding elements are designed as pin elements, tabs or pin elements. The holding elements can be in particular a component of the second connecting element. These holding elements can be positioned on the wood carrier element and can be accommodated in the wood carrier element without great force being applied. In particular, the holding elements can have sharp edges and / or an end tapering to a tip, which facilitates the introduction into the wood carrier element.In particular, if the first engagement elements are designed as pin elements or pin elements, the first engagement elements can be pressed into the corresponding second connecting element, which is connected to the wood carrier element, by the dead weight of the concrete element, so that a relative movement between the wood carrier element and the concrete element is no longer possible after the establishment of the bond between the first and second connecting elements or a plurality of first and associated second connecting elements. In addition, connecting means can also be passed through the sleeve element, which engage in the wood carrier element, for example threaded screws, nails, bolts, pins.According to an embodiment, the first engagement elements are accommodated in a protective layer when they are not connected to the wood carrier element. In particular, the protective layer may include an adhesive layer containing an adhesive. The protective layer serves to protect the engagement elements from transport damage. The protective layer prevents concrete from being able to enter the intermediate spaces between the first engagement elements during the production of the concrete element.According to one exemplary embodiment, the protective layer is at least partially removable from the base body. In particular, after completion of the concrete element with the integrated first connecting element or elements, the protective layer can be removed before the corresponding first connecting element is positioned on the associated second connecting element of the wood carrier element. If the width of the second connecting element is smaller than the width of the wood carrier element, the width of the protective layer may correspond to the width of the wood carrier element. The protective layer can thus project beyond the second base body. This solution has the advantage that no concrete shoulder is formed in the bearing region of the concrete element on the wood carrier element, which concrete shoulder could prevent the first surface of the first base body from coming to lie on the surface of the second base body of the second connecting element connected to the wood carrier element after the first and second engaging elements have been engaged. By means of the protective layer, a planar bearing surface for the first and second base bodies of the first and second connecting elements can thus also be created. Thus, surface contact can be made between the first and second connection members.In addition, the protective layer may include a plurality of layers. For example, the protective layer can comprise an outer layer, which is in particular designed as a non-adhesive outer layer, and an adhesive layer arranged underneath. The outer layer can be provided for transporting the connecting element. In addition, the connecting element can be positioned at any desired position in the formwork for the concrete element and can be easily displaced as long as the outer layer is part of the protective layer. Only when the correct position is reached is the outer layer removed and the connecting element with the adhesive layer positioned on the formwork.Following the adhesive layer, according to one exemplary embodiment, a receiving layer can be provided which is designed to receive the engagement elements. The receiving layer may include a foam or an elastomer such that the engagement elements may be embedded in the receiving layer.According to an embodiment, the first base element includes retaining elements arranged on the second surface, which are intended to be received in the concrete element. By means of the retaining elements, on the one hand, the retention of the first connecting element or elements in the concrete element is improved, and on the other hand, the retaining elements can serve for reinforcing the concrete element.According to an embodiment, the sleeve member has a central axis, wherein the angle that the central axis encloses with the first surface is in the range of 30 degrees to 90 degrees inclusive. If at least a part of the sleeve elements form an angle not equal to 90 degrees with the second surface of the base body, these sleeve elements can absorb additional forces.According to an embodiment, the sleeve element channel extends from the first end to the second end of the sleeve element. In particular, the cross-sectional area of the sleeve element channel corresponds substantially to the cross-sectional area of the opening. A continuous sleeve element channel enables the guidance of a connecting means which can be used for connecting the concrete element to the wood carrier element. By means of the connecting means, a prestress of the concrete element can be generated, so that in the assembled state of the system no tensile forces are exerted on the concrete element. It can thus be ensured that the concrete element is under compressive stress, which can decisively increase the service life of the system.According to one exemplary embodiment, the sleeve element is detachably connected to the base body. For example, the sleeve element can be connected to the base body by means of a snap connection, a latching mechanism. The number and arrangement of the sleeve elements can thus be adapted to the need. Depending on the load conditions determined, a larger or smaller number of sleeve elements can thus be provided.If the sleeve elements are not used for the transmission of forces, because reinforcing irons or the like are inserted into the concrete element for this purpose, the sleeve elements can also contain a plastic.Brief Description of the DrawingsThe connecting element according to the invention is illustrated below with reference to some exemplary embodiments. They show FIG. 1 shows a system for connecting a wood carrier element to a concrete element according to a first exemplary embodiment, FIG. 2 ashows a side view of a first and second connecting element according to a first exemplary embodiment for a system according to FIG. 1, FIG. 2 bshows a top view of the first connecting element according to FIG. 2 a, FIG. 2 cshows a further side view of a first and second connection element according to a first exemplary embodiment for a system according to FIG. 1, FIG. 2 dis a side view of the first and second connecting elements according to FIG. 2 cin the assembled state, FIG. 2e is a top view of the first connecting element according to FIG. 2a, which is rotated through an angle of 90 degrees with respect to the representation according to FIG. 2b, FIG. 2f shows a section through the first connecting element according to FIG. 2c, FIG. 2 g shows a section through the second connecting element according to FIG. 2 c, FIG. 2 h shows a section through the first and second connecting elements according to FIG. 2 d, FIG. 3 ashows a view of a first connecting element according to a second exemplary embodiment of the invention, FIG. 3 bshows a view of a second connecting element according to a second exemplary embodiment of the invention, FIG. 4 shows a system according to a second exemplary embodiment, FIG. 5 shows a system according to a third exemplary embodiment, FIG. 6 shows a system according to a fourth exemplary embodiment.Detailed Description of the DrawingsFIG. 1 shows an embodiment of a system 10 for connecting a wood carrier element 4 to a concrete element 5. the system 10 contains a first connecting element 1 and a second connecting element 2. the first connecting element contains a first base element 11, wherein the first base element 11 comprises a first base body 12, wherein a plurality of first engagement elements 13 are arranged on the first base body 12 and project beyond the first base body 12. The first base element 11 thus comprises the first base body 12 and the first engagement elements 13. The first engagement elements 13 can be designed in particular as projections. The first engagement elements 13 thus project beyond the first base body 12.The second connecting element 2 contains a second base element 21, wherein the second base element 21 comprises a second base body 22, wherein a plurality of second engagement elements 23 are arranged on the second base body 22, which engage elements project beyond the second base body 22. The first connecting element 1 can be connected to the second connecting element 2 in such a way that the first engaging elements 13 are at least partially accommodated in the second engaging elements 23 when the first connecting element 1 and second connecting element 2 are connected to one another.FIG. 2 ashows a side view of a first and second connecting element 1, 2 according to a first exemplary embodiment for a system according to FIG. 1. the first connecting element 1 contains a first base element 11, wherein the first base element 11 comprises a first base body 12. On the first base body 12 a plurality of first engagement elements 13 are arranged, which project beyond the first base body 12 as projections.The first connecting element 1 according to the exemplary embodiment shown in FIG. 2 aincludes a sleeve element 7. the sleeve element 7 is connectable to the first base element 11 in such a way that a sleeve element channel 8 formed by the sleeve element 7 is arranged corresponding to an opening 15 of the first base element 11. The first base element 11 comprises a first base body 12, wherein a plurality of engagement elements 13 is arranged on the first base body 12. According to this exemplary embodiment, the engagement elements 13 are designed as projections. According to FIG. 1, the sleeve element has a height HH measured from the first base body 12. The first engagement elements 13 have a maximum height HE, wherein the height HH of the sleeve element 7 can be greater than the maximum height HE of each of the first engagement elements 13.In FIG. 1, the first base body 12 is schematically shown, i.e. it has no wall thickness. According to FIG. 2 a, the first base body 12 has a wall thickness. The wall thickness of the first base body 12 can be, for example, 1 mm to 10 mm inclusive. The first base body 12 includes a first surface and a second surface, the first surface being disposed opposite the second surface. The first engagement elements 13 adjoin the first surface. According to this exemplary embodiment, a sleeve element 7 extends from the second surface. The height HH is measured from the second surface of the first base body. The second engagement elements 13 have a maximum height HE. The height HE is measured from the first surface. According to this embodiment, the height HH of the sleeve member 7 is greater than the maximum height HE of each of the first engagement members 13. The maximum height HE of the first engagement elements 13 can be up to and including 50% of the height HH of the sleeve element 7. In addition, holding elements can be arranged on the second surface, which is not shown in the drawing in FIG. 2 a.The second connecting element 2 contains a second base element 21, wherein the second base element 21 comprises a second base body 22. On the second base body 22, a plurality of second engagement elements 23 are arranged, which project beyond the second base body 22. The second base body 22 may have a first surface and a second surface, wherein the first surface is arranged opposite the second surface. According to the present embodiment, the second engagement elements 23 are arranged as recesses in the first surface. The second surface can be designed as a planar surface which is intended to be placed on the wood carrier element 4 (see FIG. 1 ). A schematically illustrated fastening device 3 can be provided to connect the second connecting element 2 to the wood carrier element 4. The fastening device 3 can be formed, for example, as an adhesive layer, that is to say a layer containing an adhesive.The first connecting element 1 is connectable to the second connecting element 2 such that the first engaging elements 13 are at least partially accommodated in the second engaging elements 23 when the first connecting element 1 and the second connecting element 2 are connected to each other, which is shown in FIG. 2 d.FIG. 2 bshows a top view of the first connecting element according to FIG. 2 a. The first base element 11 comprises the first base body 12 and the first engagement elements 13. The first engagement elements 14 are designed as truncated pyramids according to this exemplary embodiment. According to an exemplary embodiment, which is not shown, the first engagement elements 13 can be designed as truncated cones. As the distance from the first base body 12 increases, the cross-sectional areas of the first engagement elements 13 can decrease. The cross-sectional areas are measured in planes which are arranged parallel to the plane containing the surface of the first base body 12. This embodiment is particularly advantageous because the first engagement elements 13 can be brought into engagement with the second engagement elements 23 in a simple manner. The first engagement elements are centered in the second engagement elements 23, so that a particularly simple coupling of the first engagement elements 13 with the second engagement elements 23 is made possible.FIG. 2 cshows a further side view of a first and second connection element according to a first exemplary embodiment for a system according to FIG. 1, wherein for the description of the first and second connection elements reference can be made to the description according to FIGS. 2 aand 2 b. In FIG. 2 c, it is shown that the first engagement elements 13 can be accommodated in a protective layer 6. The first engagement elements 13 can be protected by means of the protective layer 6, for example, from transport damage or contamination if they are not yet connected to the second connecting element or the second connecting elements 2.The protective layer 6 may include an adhesive layer containing an adhesive. The use of a protective layer also prevents concrete from being able to enter the intermediate spaces located between the first engagement elements 13 when concrete in the liquid or flowable state flows around the connecting element or elements when the concrete element 5 is produced. In particular, the protective layer 6 can be at least partially removable from the first base body 12. When the protective layer 6 is removed, the first engagement members 13 are exposed. The protective layer can already be produced together with the first connecting element 1 during production thereof or can be subsequently applied, so that the first engagement elements 13 are protected from transport damage or contaminants. In addition, a risk of injury due to the embedding of the first engagement elements 13 in the protective layer 6 is reduced, in particular if the first engagement elements 13 contain sharp edges or points.According to this exemplary embodiment, the second connecting element 2 can also comprise such a protective layer 6. The protective layer 6 may be provided on the first surface of the second base body 22. According to each of the embodiments, the protective layer may comprise a plastic, cardboard or paper.FIG. 2 d shows a side view of the first and second connecting elements 1, 2 according to FIG. 2 cin the assembled state, wherein the protective layer 6 has been removed before the assembly.FIG. 2e shows a top view of the first connecting element according to FIG. 2a, which is rotated by an angle of 90 degrees with respect to the illustration according to FIG. 2b.FIG. 2 f shows a section through a first connecting element 1 for connecting a wood carrier element 4 to a concrete element 5 according to FIG. 2 cor 2 eaccording to the section line denoted by A-A in FIG. 2 e. The first connecting element 1 contains a first base element 11 and a sleeve element 7, wherein the sleeve element 7 can be connected to the first base element 11 in such a way that a sleeve element channel 8 formed by the sleeve element 7 is arranged corresponding to an opening 15 of the first base element 11. The first base element 11 comprises a first base body 12, wherein a plurality of first engagement elements 13 is formed by the first base body 12. The first engagement elements 13 have the shape of a trapezoid in the sectional illustration.The height HE of the first engagement elements 13 is at most 50% of the height HH of the sleeve element 3. The thickness of the concrete element 5, denoted by HB in FIG. 1, is greater than the height HH of the sleeve element 7. entry of concrete into the sleeve element channel can be prevented if the thickness HB is less than the sum of the height HH plus the height HE plus the wall thickness of the first base element 11.According to the embodiment shown in FIG. 2 f, the sleeve element channel 8 extends from the free end to the second surface of the first connecting element 1.According to an embodiment not shown in the drawing, the sleeve element 7 can be detachably connected to the first base element 11. In particular, the sleeve element 7 can be insertable or screwable into the first base body 12 of the first base element 11. According to an exemplary embodiment, which is not shown, a latching connection or a snap connection can be provided. The connection between the sleeve element 7 and the first base element 11 can also be designed as an adhesive connection. The connection between the sleeve element 7 and the first base element 11 can be designed as a form-fit or force-fit connection.FIG. 2 g shows a section through the second connecting element 2 for connecting a wood carrier element 4 to a concrete element 5 according to FIG. 2 cor 2 eaccording to the section line denoted by A-A in FIG. 2 e. The second connecting element 1 contains a second base element 21, the second base element 21 comprises a second base body 22, wherein a plurality of second engagement elements 23 are arranged in the second base body 22. The second engagement elements 23 are formed as recesses. They have the shape of a trapezoid in the sectional illustration.FIG. 2 h shows a section through the first and second connecting elements 1, 2 according to FIG. 2 cor 2 eaccording to the section line denoted by A-A in FIG. 2 e. FIG. 2 athus shows the first and second connecting elements 1, 2 in the assembled state, in which the first engagement elements 13 of the first connecting element 1 are accommodated in the second engagement elements 23 of the second connecting element 2.The method for connecting a wood carrier element 4 to a concrete element 5 comprises the following steps: the first connecting element 1 is connected to the concrete element 5, wherein the first connecting element 1 is positioned in a formwork (not shown) for the concrete element 5 at the position at which the wood carrier element 4 is located in the installed state. As shown in FIG. 2 c, a protective layer 6 can be attached to the first engagement elements 13 in order to prevent liquid concrete from flowing into the intermediate spaces located between the first engagement elements 13 and hardening there. Alternatively, the second connecting element 2 can act as a protective layer 6 in the configuration shown in FIG. 2 d. Once the concrete forming the concrete element 5 has cured, the protective layer 6 can be removed or the second connecting element 2 can be removed. The second connecting element 2 or a number of second connecting elements 2 corresponding to the number of first connecting elements 1 can be positioned on the wood carrier element and fastened in the desired position by means of the fastening device 3.In the subsequent working step, the concrete element 5 is assembled with the wood carrier element 4. the first and second connecting elements 1, 2 are positioned one above the other in such a way that the first and second engagement elements 13, 23 engage one another, as shown in FIG. 2 dor FIG. 2 h.In particular, after assembly, a connecting means can be guided through the sleeve element 7, so that the concrete element 5 is also connected to the wood carrier element 4 via the connecting means as soon as the concrete element 5 is positioned in the desired position on the wood carrier element 4, i.e. the first and second connecting elements 1, 2 are connected to one another. The connecting means is passed through the sleeve element channel 8 and the corresponding opening 15, which is not shown in the drawing.FIG. 3 ashows a first connecting element 1 according to a second exemplary embodiment of the invention. Identical or identically functioning components bear the same reference numerals as in the preceding representations. Reference is therefore made to the description of the preceding exemplary embodiments. Therefore, only the differences from the preceding exemplary embodiments will be referred to below. The exemplary embodiment according to FIG. 3 adiffers from the first exemplary embodiment in that the first base element 11 is substantially U-shaped. The first base element 11 comprises the first base body 12, which contains a plate-shaped element. The first base body 12 contains not only the first engagement elements 13, but also a longitudinal rib 14 and a plurality of transverse ribs 16. The transverse ribs 16 run substantially at right angles to the longitudinal rib 14. The first connecting element 2 is reinforced by means of the longitudinal rib 14 and the transverse ribs 16, so that the material consumption for the first connecting element 1 can be reduced, since the required wall thicknesses for the first base body 12 and for the first engagement elements 13 can be selected to be smaller than in the preceding exemplary embodiment. In addition, the first connecting element 1 can be manufactured in a simple manner from plastic in a single piece, for example by injection molding. In particular, the transverse ribs 16 enable anchoring in the concrete element, since the flowable concrete can flow around transverse ribs, so that the first connecting element 1 is completely accommodated in the concrete, with the exception of the bottom side, which is not visible and contains the first engagement elements 13.In FIG. 3 a, a sleeve element 7 is also shown, the sleeve element channel 8 of which is arranged substantially orthogonally with respect to the second surface of the first base body 11. The width and length of the first base body 11 can deviate from the present drawing. In particular, more or fewer first engagement elements 13 can also be provided. In addition, the number and / or arrangement of the longitudinal ribs 14 and of the transverse ribs 16 can also differ from the exemplary embodiment shown by way of example.FIG. 3 bshows a view of a second connecting element 2 according to a second exemplary embodiment of the invention, which can be coupled to the first connecting element 1 according to FIG. 3 a. The second connecting element 2 contains a second base element 21, wherein the second base element 21 comprises a second base body 22, wherein a plurality of second engagement elements 23 are arranged on the second base body 22, which are formed as recesses of the second base body 22. The second base body 22 contains not only the second engagement elements 23, but also a plurality of longitudinal ribs 24 and a plurality of transverse ribs 26. The transverse ribs 26 run substantially at right angles to the longitudinal ribs 24. The second connecting element 2 is reinforced by means of the longitudinal ribs 24 and the transverse ribs 26, so that the material consumption for the second connecting element 2 can be reduced, since the required wall thicknesses for the second base body 22 and for the second engagement elements 23 can be selected to be smaller with comparable stability than in the preceding exemplary embodiment.The width and length of the second base body 22 can deviate from the present drawing. In particular, a higher number or a lower number of second engagement elements 23 can also be provided.The first and second engagement elements 13, 23 can have different base diameters according to each of the exemplary embodiments or a different base cross-sectional area in the case of engagement elements with a non-circular cross-sectional area. The engagement elements can contain profiles, for example ribs, grooves. The engagement elements can be arranged at different angles to one another. In particular, the angle which a flank of one of the first or second engagement elements 13, 23 with the corresponding first or second surface of the corresponding base body 12, 22 can be in the range from 30 degrees to 90 degrees inclusive. In particular, the angle can be in the range from 45 degrees to 75 degrees, which enables simple plugging together of the corresponding engagement elements. In addition, the first and second connecting elements can be separated from one another again without additional effort should a disconnection of the connection become necessary at any point in time.FIG. 4 shows a section through a system 10 for connecting a wood carrier element 4 to a concrete element 5 according to a second exemplary embodiment. The wood carrier element 4 and the concrete element 5 have a common surface, wherein according to this exemplary embodiment the concrete element 5 rests on the wood carrier element 4. According to this exemplary embodiment, the wood carrier element 4 is designed as a plate-shaped wood carrier element.The system 10 contains a plurality of first and second connecting elements 1, 2 according to one of the exemplary embodiments, in this illustration the first and second connecting elements 1, 2 according to FIGS. 2 a- h are chosen by way of example. Instead of these first and second connecting elements 1, 2, the first and second connecting elements according to FIGS. 3 aand 3 bmay also be used. The first connecting element 1 contains a first base element 11 and a sleeve element 7, wherein the sleeve element 7 can be connected to the first base element 11 in such a way that a sleeve element channel 8 formed in the sleeve element 7 is arranged corresponding to an opening 15 in the first base element 11. The first base element 11 comprises a first base body 12, which can be designed as a plate-shaped element. A plurality of first engagement elements 13 are arranged on the first base body 11. The first engagement elements 13 are accommodated in second engagement elements 23 of a second connecting element 2, which is arranged on the wood carrier element 4. According to FIG. 4, the first base body 11 and the sleeve element 7 of the first connecting element 2 are accommodated in the concrete element 5.The height HE of the first engagement elements 13 is at most 50% of the height HH of the sleeve element 7 (see FIG. 1 ). The thickness of the concrete element 5, denoted HBin FIG. 1, may be greater than, less than or equal to the sum of the height HHof the sleeve element 7 and the height HEof the first engagement elements 13. Entry of concrete into the sleeve element channel is prevented if the sleeve element 7 projects beyond the surface of the concrete element 5. Alternatively, the sleeve element channel 8 could be closed at its end by a stopper, which is not shown in the drawing.The system according to FIG. 4 has a particularly balanced load distribution. According to this exemplary embodiment, the wood carrier element 4 and the concrete element 5 have the maximum common bearing surface. This system 10 has proven to be advantageous in particular when the wood-concrete composite element is used to cover large surfaces, for example for producing building ceilings. According to this embodiment, a weight force acting from the concrete element on the wood carrier element can be distributed optimally. Consequently, according to this embodiment, the wood carrier member 4 can be used for better and more uniform pressure distribution, so that such a system is characterized by high stability.FIG. 5 shows a section through a system 10 for connecting a wood carrier element 4 to a concrete element 5 according to a third exemplary embodiment. The wood carrier element 4 and the concrete element 5 have a common surface, wherein according to this exemplary embodiment the wood carrier element 4 rests on the concrete element 5. According to this exemplary embodiment, the wood carrier element 4 is designed as a plate-shaped wood carrier element. The concrete element 5 can be configured either as a beam-shaped concrete element or as a plate-shaped concrete element, both variants being shown in FIG. 5. The wood carrier element 4 and the concrete element 5 can be connected to one another by a first and second connecting element 1, 2 according to one of the preceding exemplary embodiments and / or by a connecting means. According to the present exemplary embodiment, the first connecting element 1 has an opening 15 in the first base body 12, which opening is intended to receive the connecting means, which can extend along the central axis 9 through at least one wood carrier element 4 or the concrete elements 5. The connecting means is not shown in the drawing. It can be, for example, a pin, a screw or a nail.The system contains a first and a second connecting element 1, 2 according to one of the exemplary embodiments, in this illustration a first and a second connecting element 1, 2 according to FIGS. 2 a- 2 hare exemplarily illustrated. Instead of these first and second connecting elements 1, 2, for example, a first and second connecting element 1, 2 according to FIGS. 3 a, 3 bmay be used. The first connecting element 1 contains a first base element 11 and a sleeve element 7, wherein the sleeve element 7 can be connected to the first base element 11 in such a way that a sleeve element channel 8 formed in the sleeve element 7 is arranged corresponding to an opening 15 in the first base element 11. The first base element 11 comprises a first base body 12, which can be designed as a plate-shaped element. A plurality of first engagement elements 13 are arranged on the first base body 11. The first engagement elements 13 are accommodated in second engagement elements 23 of a second connecting element 2, which is arranged on the wood carrier element 4.FIG. 6 shows a section through a system 10 for connecting a wood carrier element 4 to a concrete element 5 according to a third exemplary embodiment. The wood carrier element 4 and the concrete element 5 have a common surface, wherein according to this exemplary embodiment the wood carrier element 4 rests on the concrete element 5. According to this exemplary embodiment, the wood carrier element 4 is designed as a beam-shaped wood carrier element. The concrete element 5 is also designed as a beam-shaped element. The wood carrier element 4 and the plate element 5 can be connected to one another by a connecting means. According to the present exemplary embodiment, the first connecting element 1 has an opening 15 in the first base body 11 and a sleeve element 7 with an associated sleeve element channel 8, which is intended to receive the connecting means, which can extend along the central axis 9 through at least one wood carrier element 4 or the concrete elements 5. The connecting means is not shown in the drawing. It can be, for example, a pin, a screw or a nail.The system contains a first and a second connecting element 1, 2 according to one of the exemplary embodiments, in this illustration a first and a second connecting element 1, 2 according to FIGS. 2 a- 2 hare exemplarily illustrated. Instead of these first and second connecting elements 1, 2, for example, a first and second connecting element 1, 2 according to FIGS. 3 a, 3 bmay be used. The first connecting element 1 contains a first base element 11 and a sleeve element 7, wherein the sleeve element 7 can be connected to the first base element 11 in such a way that a sleeve element channel 8 formed in the sleeve element 7 is arranged corresponding to an opening 15 in the first base element 11. The first base element 11 comprises a first base body 12, which can be designed as a plate-shaped element. A plurality of first engagement elements 13 are arranged on the first base body 11. The first engagement elements 13 are accommodated in second engagement elements 23 of a second connecting element 2, which is arranged on the wood carrier element 4.According to the present embodiment, the second connecting member 2 includes a plurality of holding members 25. The holding elements 25 are arranged opposite the second engagement elements 23. The holding elements 25 are intended for engagement in the wood carrier element 4, which is shown in FIG. 6.The holding elements 25 may be accommodated in a protective layer when they are not connected to the wood carrier element 4, wherein the protective layer may contain an adhesive layer containing an adhesive. The use of a protective layer prevents concrete from being able to enter the intermediate spaces located between the holding elements 25. In particular, the protective layer can be at least partially removable from the second base body 22. When the protective layer is removed, the holding members 25 are exposed. The protective layer can already be provided during the production of the holding elements 25, so that the holding elements 25 are protected from transport damage. In addition, a risk of injury due to the embedding of the holding elements 25 in the protective layer is reduced. The protective layer is not shown in FIG. 6 since it shows the first and second connection elements in the installed state.It will be obvious to the person skilled in the art that many further variants are possible in addition to the described exemplary embodiments without departing from the inventive concept. The subject matter of the invention is thus not limited by the foregoing description and is determined by the scope of protection defined by the claims. The broadest possible way of interpreting the claims or the description is to use the claims. In particular, the terms "include" or "include" are to be interpreted as referring to elements, components, or steps in a non-exclusive sense, which is intended to indicate that the elements, components, or steps may be present or utilized to be combined with other elements, components, or steps that are not explicitly mentioned. When the claims refer to an element or component from a group that may consist of A, B, C to N elements or components, this formulation is to be interpreted as requiring only a single element of this group, rather than a combination of A and N, B and N or any other combination of two or more elements or components of this group.

Claims

A system (10) for connecting a wood support element (4) to a concrete element (5) comprising a first connecting element (1) and a second connecting element (2), wherein the first connecting element (1) comprises a first base element (11), wherein the first base element (11) comprises a first base body (12), wherein the first base body (12) is configured for being received in the concrete element (5), characterized in that the first base body (12) is configured as a shell comprising a shell floor and shell walls and a shell opening opposite the shell floor, wherein the shell floor and the shell walls are configured to prevent the penetration of flowable concrete into the shell during the assembly of the first connecting element (1), wherein a plurality of first engagement elements (13) is arranged in the shell, wherein the first engagement elements (13) extend from the shell base in the direction of the shell opening, wherein the second connecting element (2) contains a second base element (21), wherein the second base element (21) comprises a second base body (22), wherein the second base body (22) contains a plurality of second engagement elements (23) which are formed as recesses in the second base body (22), wherein the first connecting element (1) can be connected to the second connecting element (2) in such a way that the first engagement elements (13) are at least partially accommodated in the second engagement elements (23) when the first connecting element (1) and the second connecting element (2) are connected to one another.The system according to claim 1, wherein the second connecting element (2) is connectable to the wood carrier element (4) by means of a fastening device (3), wherein the fastening device (3) is configured for engaging the wood carrier element (4).The system according to claim 2, wherein the fastening device (3) comprises at least one element from the group consisting of mandrel elements, nail elements, screw elements, screw elements, adhesives.The system according to any one of the preceding claims, wherein at least one of the first or second connection elements (2) comprises a protective layer (6) which may contain an adhesive layer, wherein the adhesive layer may contain an adhesive, wherein the protective layer (6) may be at least partially removable from the first or second connection element (1, 2) or wherein the protective layer (6) of the first connection element (1) is formed by the second connection element (2) or the protective layer (6) of the second connection element (2) is formed by the first connection element (1).A system according to any preceding claim, wherein the first connecting element (1) includes a sleeve element (7) extending from the tray base in the direction opposite the engagement elements (13, 23).The system according to claim 5, wherein the sleeve element (7) has a height HH measured from the first base body (12), wherein the first engagement elements (13) have a maximum height HE, wherein the height HH of the sleeve element (7) can be greater than the maximum height HE of each of the first engagement elements (13).The system according to any of claims 5 or 6, wherein the sleeve element (7) has a height corresponding at least to the thickness of the concrete element (5) such that the sleeve element (7) extends through the concrete element (5).The system according to any one of claims 5 to 7, wherein the sleeve element (7) has a central axis (9), wherein the angle which the central axis (9) encloses with the surface of the first base element (11) is in the range of 30 degrees to 90 degrees inclusive.The system according to any of the preceding claims, wherein the first connection element (1) and the second connection element (2) comprise a plastic.System according to one of the preceding claims, wherein the first connecting element (1) and the second connecting element (2) are formed as injection moulded parts.

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