Finished composite part

Abstract

In a composite precast element (1) comprising a tension layer (2) and a concrete layer (3) connected to the tension layer (2), it is proposed that at least one recess (4) is arranged in the tension layer (2), that the concrete layer (3) engages in the at least one recess (4) to form a positive connection with the tension layer (2), that at least one lifting anchor (5) is arranged at least partially in the concrete layer (3), that a connecting device (6) of the at least one lifting anchor (5) is arranged on a side of the concrete layer (3) facing away from the tension layer (2), and that a load-bearing part of the at least one lifting anchor (5) is arranged within the at least one recess (4).

Description

[0001] The invention relates to a composite prefabricated part according to the preamble of patent claim 1.

[0002] It is well known that building ceilings are constructed using a timber-concrete composite construction method. This typically involves adding a concrete ceiling to a timber ceiling. Such composite ceilings are common in building renovations or extensions, such as attic conversions, and are also used in new buildings as part of lightweight construction. In such composite ceilings, the concrete layer absorbs the compressive stresses, while the timber layer absorbs the tensile stresses. Due to the additional mass of the concrete layer, combined with the high internal damping of concrete, such composite ceilings exhibit excellent building acoustic properties in addition to their low weight.

[0003] Typically, the concrete layer and the wood layer are connected by a form-fit connection via several projections or recesses in the wood layer of an existing wooden ceiling. These projections or recesses can be formed by fasteners driven into the wood layer, or by grooves or recesses in the wood layer, commonly referred to in the industry as notches, which are milled into the wood layer on site. The concrete layer is poured directly onto the existing or previously constructed wood layer on site.

[0004] Furthermore, prefabricated composite ceilings comprising one or more precast composite elements can be used to construct building or floor ceilings. These precast composite elements or composite ceilings have lifting anchors for lifting the elements. In such prefabricated composite ceilings, in which the composite effect is achieved solely through notches, the lifting anchors must be anchored in the timber layer, as otherwise, the concrete layer will separate from the timber layer when the precast composite elements or composite ceilings are lifted. For this purpose, textile loops are usually connected to the connecting devices, and the precast composite elements or composite ceilings are lifted during assembly.

[0005] DE 10 66 725 B shows a reinforced concrete slab with rigid metal beams serving as reinforcement and formwork remaining in the slab. Such a slab is used to shield against radioactive radiation. In-situ concrete is poured onto the formwork on site to complete the slab.

[0006] Document DE 10 66 725 B discloses a composite prefabricated part according to the preamble of claim 1.

[0007] EP 2146017 A1 shows formwork elements for the construction of reinforced concrete ribbed slabs using the cast-in-place method. The formwork body is poured with cast-in-place concrete on site, and reinforcement is inserted into the concrete.

[0008] DE 2558661 A1 discloses a semi-prefabricated beam with reinforced concrete reinforcement, which is supplemented on a construction site with in-situ concrete and possibly reinforcement to form a reinforced concrete beam

[0009] The disadvantage of constructing a composite deck over an existing timber layer is that such decks are complex and laborious to construct. The manufacture and installation of the fasteners is complex, time-consuming, and associated with high noise levels for workers and neighbors. Furthermore, the use of large quantities of synthetic resin adhesive to secure the fasteners is not uncommon.

[0010] Furthermore, the fasteners driven into the timber layer on a construction site, or the lifting anchors used in prefabricated composite elements or composite slabs and secured in the timber layer, generally have a low load-bearing capacity. This severely limits the safety of the composite elements or composite slabs.

[0011] The object of the invention is therefore to provide a composite prefabricated part of the type mentioned at the outset, with which simple production and higher safety of the composite prefabricated part can be achieved.

[0012] According to the invention, this is achieved by the features of patent claim 1. This results in the advantage that the precast composite element can be easily manufactured and a higher level of safety is achieved for the precast composite element. The precast composite element can be assembled quickly, easily and safely on a construction site. This makes it possible to produce a load-bearing composite floor using dry construction. Because the concrete layer engages in the at least one recess in the tensile layer, the thickness of the concrete layer is locally increased in the area of ​​the recess. This allows lifting anchors from concrete technology to be used, and the remaining thickness of the concrete layer can be reduced in contrast to conventional precast composite elements. The arrangement of the lifting anchor in the local thickening of the concrete layer in the area of ​​the recess enables high load-bearing loads, thereby increasing the safety of the precast composite element.Furthermore, the sturdy connecting devices commonly used in concrete construction can be used, further increasing safety. This allows for the creation of a composite floor that is more resilient than conventional composite floors while simultaneously exhibiting a lower mass.

[0013] Another advantage is that, thanks to the use of lifting anchors from concrete technology, a uniform lifting system can be used for different materials on a construction site. Special anchor systems are no longer required, and confusion and / or errors when using different lifting systems, especially in so-called hybrid construction with different materials, can thus be easily avoided.

[0014] Another advantage is that the production of the precast composite component is significantly simplified. The at least one lifting anchor can be installed in the concrete plant, and thus only the at least one recess is created in the tensile layer. This enables simple and safe handling of the flat-topped tensile layer panels using vacuum lifters in the timber plant and the concrete plant.

[0015] The invention further relates to a composite ceiling according to claim 12.

[0016] The invention further relates to a method for producing a composite prefabricated part according to claim 13.

[0017] The object of the invention is therefore to provide a method which enables a simple production of a composite prefabricated part, wherein the composite prefabricated part has a higher level of safety.

[0018] According to the invention, this is achieved by the features of patent claim 13.

[0019] The advantages of the composite precast element correspond to the advantages of the process.

[0020] The subclaims relate to further advantageous embodiments of the invention.

[0021] Express reference is hereby made to the wording of the patent claims, whereby the patent claims are incorporated into the description at this point by reference and are deemed to be reproduced verbatim.

[0022] The invention will be described in more detail with reference to the accompanying drawings, in which only preferred embodiments are shown by way of example. In the drawings: Fig. 1 a section of a preferred embodiment of the composite prefabricated part in side view; Fig. 2 a section of another preferred embodiment of the composite prefabricated part in side view; Fig. 3 a first preferred embodiment of the lifting anchor in an axonometric view; Fig. 4 a second preferred embodiment of the lifting anchor in an axonometric view; Fig. 5 a third preferred embodiment of the lifting anchor in an axonometric view; Fig. 6 a fourth preferred embodiment of the lifting anchor in an axonometric view and Fig. 7 a fifth preferred embodiment of the lifting anchor in an axonometric view.

[0023] The Fig. 1 to 7show at least parts of preferred embodiments of a composite prefabricated part 1 comprising a tensile layer 2 and a concrete layer 3 connected to the tensile layer 2, wherein at least one recess 4 is arranged in the tensile layer 2, wherein the concrete layer 3 engages in the at least one recess 4 to form a positive connection with the tensile layer 2, wherein at least one lifting anchor 5 is arranged at least partially in the concrete layer 3, wherein a connecting device 6 of the at least one lifting anchor 5 is arranged on a side of the concrete layer 3 facing away from the tensile layer 2, and wherein a load-bearing part of the at least one lifting anchor 5 is arranged within the at least one recess 4.

[0024] Furthermore, a method for producing a composite prefabricated part 1 is provided, wherein a plate of a tensile material is used as a tensile layer 2 for the composite prefabricated part 1, wherein at least one recess 4 is created in the tensile layer 2, wherein at least one lifting anchor 5 is arranged such that a load-bearing part of the lifting anchor 5 is arranged in the at least one recess 4 and a connecting device 6 of the at least one lifting anchor 5 is arranged outside the at least one recess 4, wherein to form a concrete layer 3 which is positively connected to the tensile layer 2, concrete is poured onto the tensile layer 2 in a casting process, wherein the concrete penetrates into the at least one recess 4 during the casting process and thereby substantially envelops the load-bearing part of the at least one lifting anchor 5, wherein after the casting process the connecting device 6 of the at least one lifting anchor 5 is attached to a,the side of the concrete layer 3 facing away from the tensile layer 2.

[0025] A composite precast element 1 comprises a tensile layer 2 and a concrete layer 3. The tensile layer 2 absorbs tensile stresses and the concrete layer 3 absorbs compressive stresses.

[0026] Particularly preferably, the tensile layer 2 can be designed as a wooden layer, preferably as a cross-laminated timber panel. This allows for a low weight combined with high load-bearing capacity.

[0027] The tensile layer 2 can in particular also consist of individual beams, preferably made of wood and / or wood-based material, which are arranged next to one another with or without a spacing, preferably parallel.

[0028] It is preferably provided that the composite prefabricated element 1 has only a tensile layer 2 and a concrete layer 3.

[0029] Preferably, the concrete layer 3 is attached to the tensile layer 2 only on one surface.

[0030] At least one recess 4 is arranged in the tensile layer 2. The concrete layer 3 engages in the at least one recess 4 to form a positive connection with the tensile layer 2. This creates a local thickening of the concrete layer 3 in the region of the recess 4 compared to the remaining concrete layer 3. At least one lifting anchor 5 is at least partially arranged in the concrete layer 3. At least partially arranged in the concrete layer 3 also means - seen in a lateral section - within the tensile layer 2, since the concrete layer 3 engages in the tensile layer 2 in the recess 4. Due to the at least one recess 4, an extension forms in the at least one recess 4 during the pouring of the concrete layer 3, which extension connects the concrete layer 3 to the tensile layer 2 in a positive connection. The positive connection refers in particular to a tensile force which points in a direction separating the concrete layer 3 from the tensile layer 2.

[0031] The increased local concrete layer thickness 3 allows the use of lifting anchors 5, which are suitable for the transport or assembly of precast concrete elements. This allows for high load-bearing capacities. In particular, loads of at least 2.5 tons or 4.0 tons can be lifted using a lifting anchor 5.

[0032] For example, with four lifting anchors 5 per composite precast element 1, a load capacity of 6.7 tonnes or 10.72 tonnes is possible.

[0033] The at least one lifting anchor 5 has a connecting device 6. The connecting device 6 can preferably be at least one screw thread, at least one hook, at least one threaded sleeve, in particular with an internal thread, at least one ball head, or at least one eyelet. A lifting anchor 5 with a threaded sleeve is shown by way of example in the Fig. 2 , 3, 4, 6 and 7The composite prefabricated element 1 is lifted during assembly by means of the connecting device 6.

[0034] The connecting device 6 of the at least one lifting anchor 5 is arranged on the side of the concrete layer 3 facing away from the tensile layer 2. Furthermore, the load-bearing part of the at least one lifting anchor 5 is arranged within the at least one recess 4. The load-bearing part of the at least one lifting anchor 5 arranged in the at least one recess 4 is, in particular completely, enclosed by the concrete of the concrete layer 3 that has penetrated into the at least one recess 4.Tensile forces when lifting the prefabricated composite element 1 are thus transmitted to the tensile layer 2 via the load-bearing part of the at least one lifting anchor 5 in the at least one recess 4, wherein the tensile force on the load-bearing part is transmitted as a compressive force to the part of the concrete layer 3 arranged in the at least one recess 4, whereby the forces can be easily transmitted from the load-bearing part of the at least one lifting anchor 5 to the tensile layer 2 by means of the concrete layer 3. The load-bearing part of the at least one lifting anchor 5 is that part of the lifting anchor 5 which primarily ensures the transmission of the tensile forces from the connecting device 6 to the concrete layer 2.

[0035] This results in the advantage that the precast composite element 1 can be easily manufactured and a higher level of safety for the precast composite element 1 is achieved. The precast composite element 1 can be assembled quickly, easily and safely on a construction site. This makes it possible to produce a load-bearing composite floor using dry construction. Because the concrete layer 3 engages in the at least one recess 4 of the tensile layer 2, the thickness of the concrete layer is locally increased in the area of ​​the recess 4. This allows lifting anchors 5 from concrete technology to be used, and the remaining thickness of the concrete layer 3 can be reduced in contrast to conventional precast composite elements. The arrangement of the lifting anchor 5 in the local thickening of the concrete layer 3 in the area of ​​the recess 4 enables high load-bearing loads, thereby increasing the safety of the precast composite element 1.Furthermore, the sturdy connecting devices 6 commonly used in concrete technology can be used, further increasing safety. This allows the creation of a composite floor that can withstand higher loads than conventional composite floors while simultaneously exhibiting a lower mass.

[0036] It is also advantageous that, thanks to the use of lifting anchors 5 from concrete technology, a uniform lifting system can be used for different materials on a construction site. Special anchor systems are no longer required, and confusion and / or errors when using different lifting systems, especially in so-called hybrid construction with different materials, can thus be easily avoided.

[0037] Another advantage is that the production of the prefabricated composite component 1 is significantly simplified. The at least one lifting anchor 5 can be installed in the concrete plant, and thus only the at least one recess 4 is created in the tensile layer 2. This enables simple and safe manipulation of the flat-topped tensile layer panels using vacuum lifters in the timber plant and the concrete plant.

[0038] It can be provided that the recess 4 has a penetration depth of at least 50%, in particular at least 65%, preferably at least 75%, of the tensile layer 2. The penetration depth refers to the depth of the recess 4 with respect to the thickness of the tensile layer 2.

[0039] It can further be provided that the longitudinal extent of the lifting anchor 5 is at least 50%, in particular at least 60%, preferably at least 80%, of the thickness of the composite prefabricated part 1.

[0040] Preferably, the tensile layer 2 can be thicker than the concrete layer 3. This is made possible by the use of the lifting anchor 5 in the at least one recess 4. This allows the composite precast element to be made lighter.

[0041] Preferably, the composite prefabricated part 1 has a substantially rectangular base area.

[0042] Alternatively, other geometric shapes of the composite prefabricated part 1, preferably a square base area, can be provided.

[0043] It is preferably provided that the composite prefabricated element 1 is designed as a composite ceiling panel or composite prefabricated ceiling panel.

[0044] Consequently, a composite floor comprising at least one composite prefabricated element 1 is provided.

[0045] Preferably, a visible side 11 of the tension layer 2 can be substantially planar. The visible side 11 is the side that is visible in the assembled state of the prefabricated composite component 1.

[0046] Particularly preferably, the at least one recess 4 can be a blind hole. This allows for simple production of the at least one recess 4. In this case, the lifting anchor 5 does not penetrate the tensile layer 2. Due to the formation of the recess 4, no special sealing measures are required on the visible side 11 for the concrete. Furthermore, the visible side 11 can be kept free of disruptive perforations, allowing the visible side 11 to be used without additional cladding.

[0047] By designing the recess 4 as a blind hole, the local concrete layer thickness 3 in the area of ​​the at least one recess 4 is increased, which has a very positive effect on the load-bearing capacity of the precast composite element 1.

[0048] The lifting anchor 5 is preferably made of metal, in particular of structural steel.

[0049] Because the at least one recess 4 in combination with the at least one lifting anchor 5 enables greater stability of the prefabricated composite element 1, fewer connecting devices 6 are required to lift the prefabricated composite element 6 with a lifting device. Due to the greater stability of the prefabricated composite element 1, no compensating suspension is preferably required during assembly.

[0050] It can be provided that at least, in particular exactly, three recesses 4, each with at least one lifting anchor 5, are arranged per composite prefabricated part 1. Furthermore, it can be provided that a maximum of six, in particular a maximum of four, recesses 4, each with at least one lifting anchor 5, are arranged per composite prefabricated part 1. This can reduce the effort required to manufacture the composite prefabricated part 1.

[0051] Alternatively, the at least one recess 4 may be a through hole. This also allows for simple production of the at least one recess 4.

[0052] Particularly preferably, it can be provided that the diameter of the at least one recess 4 narrows substantially continuously from the tensile layer 2 toward the concrete layer 3. This particularly promotes the positive connection between the concrete layer 3 and the tensile layer 2.

[0053] Particularly preferably, it can further be provided that the recess 4 is undercut.

[0054] Due to the preferably undercut design of the at least one recess 4, when the composite precast element 1 is lifted, an expanding compressive force is formed in the concrete cone located in the recess 4, which is transferred to the adjacent flanks of the tensile layer 2.

[0055] The recess 4 can have a pyramid shape and in particular be designed as a square or rectangular pyramid.

[0056] Alternatively, it can be provided that the at least one recess 4 does not narrow continuously, but has, for example, one or more steps.

[0057] It can be particularly preferably provided that the at least one recess 4 tapers conically from the tensile layer 2 towards the concrete layer 3.

[0058] This configuration essentially forms a round concrete cone. The at least one recess 4 is preferably formed substantially rotationally symmetrically about an axis that intersects the tensile layer 2 and the concrete layer 3 perpendicular to a longitudinal extension of the precast composite component 1. The round configuration of the recess 4 is particularly advantageous because the positive connection between the concrete layer 3 and the tensile layer 2 functions particularly well. Furthermore, this symmetrical configuration of the at least one recess 4 has a particularly positive effect on the force transmission, in particular with regard to the expansion compressive force, between the concrete layer 3 and the tensile layer 2.

[0059] It can preferably be provided that the at least one recess 4 is arranged on the prefabricated composite element 1 in such a way that it is loaded analogously to a later installation position. An additional tensile connection is therefore preferably not required for the installation case between the tensile layer 2 and the concrete layer 3.

[0060] Particularly preferably, it can be provided that the at least one recess 4 encloses a flank angle of preferably greater than or equal to 45°, in particular greater than or equal to 60°.

[0061] The flank angle is the angle which the flanks of the recess 4 enclose with the visible side 11 of the tensile layer 2 or a plane arranged parallel to the visible side 11 of the tensile layer 2.

[0062] In this case, it can be provided that the flank angle is, in particular, less than or equal to 89°. At such an angle, the recess is still undercut.

[0063] According to the invention, the at least one lifting anchor 5 has a first end 7 and a second end 8, wherein the connecting device 6 is arranged at the first end 7 and the second end 8 of the at least one lifting anchor 5 is arranged within the at least one recess 4. Within the recess 4 here also means within the concrete layer 3 engaging in the recess 4.

[0064] Because the second end 8 of the at least one lifting anchor 5 is arranged within the at least one recess 4, the second end 8 is not visible from the visible side 11 of the tensile layer 2. Accordingly, steps for concealing a lifting anchor 5 protruding through the tensile layer 2 are eliminated. Furthermore, this has a favorable effect on the transport of multiple prefabricated composite elements 1, since they can be easily stacked on top of one another.

[0065] The second end 8 is designed as a load-bearing part.

[0066] For this purpose, it can be provided in particular that only the second end 8 is designed as a load-bearing part.

[0067] Accordingly, it is provided that the load-bearing part of the at least one lifting anchor 5 is connected or fastened in a form-fitting and / or force-fitting manner in the recess 5 or with the concrete layer 3 located in the recess 5.

[0068] According to the invention, it is provided that the load-bearing part of the at least one lifting anchor 5 has at least one disc-shaped widening 9, which is exemplified in the Fig. 4 to 6 is shown.

[0069] Such lifting anchors 5 can also be referred to as bar anchors. The advantage here is that the majority of the load is absorbed within the recess 4. As previously described, the forces between the tensile layer 2 and the concrete layer 3 can be effectively transferred to each other.

[0070] Particularly preferably, it can be provided that the at least one lifting anchor 5 has a central part, which central part connects the connecting device 6 to the load-bearing part. In particular, the diameter of the load-bearing part can be at least 130%, preferably at least 150%, in particular at least 170%, of the diameter of the central part, which is exemplified in Fig. 5 is shown.

[0071] This means that the load-bearing part of the lifting anchor 5 is preferably widened with respect to the central part and / or the connecting device 6. For example, by means of a disc-shaped widening 9, the positive or non-positive fit of the lifting anchor 5 in the recess 4 can be achieved particularly well. It can also be provided that the widening 9 is designed in particular as a plate, whereby a good positive retention of the lifting anchor 5 in the recess 4 is also achieved. A widening 9 designed as a plate is exemplary in Fig. 3 shown.

[0072] Particularly preferably, it can be provided that the load-bearing part of the at least one lifting anchor 5 has a plurality of rib-shaped and / or knob-shaped extensions 10. This can particularly well and easily promote the positive or non-positive retention of the lifting anchor 5. Rib-shaped extensions 10 are shown, for example, in the Fig. 6 shown.

[0073] Alternatively, it can be provided that both ends 7, 8 have the same diameter, which enables a particularly simple production of the at least one lifting anchor 5.

[0074] Particularly preferably, but not part of the claimed invention, it can be provided that a positive connection between the tensile layer 2 and the concrete layer 3 is made essentially only via the part of the concrete layer 3 arranged in the at least one recess 4 of the tensile layer 2. For this purpose, the composite prefabricated part 1 is designed in particular to be free of any bonding agents, whereby the composite prefabricated part 1 can be manufactured particularly easily and costs can be saved. In this case, no further bonding agents, for example metal anchors, are required to connect the tensile layer 2 to the concrete layer 3. This eliminates the time-consuming and complicated effort of installing the bonding agents.

[0075] In addition, it can preferably be provided that the concrete layer 3 has concrete studs and the tensile layer 2 has depressions, commonly referred to as notches. It can particularly preferably be provided that the concrete studs engage the notches of the tensile layer 2.

[0076] It can be provided that the depressions are designed as grooves with a substantially rectangular base area, wherein the depressions on the tensile layer 2 have only a small penetration depth compared to the thickness of the remaining tensile layer 2.

[0077] It may be particularly preferred that the penetration depth of the recess 4 be deeper than the penetration depth of the depressions. It may further be provided that the precast composite element 1 does not have any parts that extend beyond the dimensions of the tensile layer 2 or the concrete layer 3. This is advantageous because it enables dense stacking of the precast composite elements 1.

[0078] In particular, it can be provided that the connecting device 6 of the at least one lifting anchor 5 does not protrude from the prefabricated composite part 1. The connecting device 6 of the at least one lifting anchor 5 can, in particular, be arranged flush with the side of the concrete layer 3 facing away from the tensile layer 2 or protrude in a recess from the side of the concrete layer 3 facing away from the tensile layer 2. It can preferably be provided that a recess 12 is arranged in the concrete layer 3 in the region of the recess 4, opposite the visible side 11 of the tensile layer 2.

[0079] It can preferably be provided that the second end 8, in particular the connecting device 6 of the lifting anchor 5, is arranged within the recess 12. This allows the connecting device 6 to be particularly easily connected to a lifting device. Furthermore, such composite prefabricated elements 1 can be easily stacked on top of one another during storage and transport, thereby saving space for storing the composite prefabricated elements 1 and space during transport of the composite prefabricated elements 1.

[0080] Alternatively, it can be provided that the connecting device 6 protrudes above the concrete layer 3.

[0081] It can preferably be provided that the tensile layer 2 is designed as a wooden layer.

[0082] Particularly preferably, it can be provided that the composite prefabricated element 1 is designed as a composite panel, in particular as a composite ceiling panel.

[0083] Furthermore, a composite floor comprising at least one composite prefabricated element 1 is provided.

[0084] The composite floor can be formed from one prefabricated composite element 1 or from several prefabricated composite elements 1.

[0085] Concrete precast composite elements can be manufactured in a factory and do not have to be produced on a construction site or under construction site conditions. This means that higher quality concrete can be used than would be the case with ready-mixed or in-situ concrete. Since there is no need to wait for the concrete to harden, the laid and fixed precast composite elements can be fully loaded immediately. There is therefore no need to wait for the concrete layer to become walkable or for additional support of the wooden ceiling during hardening, which accelerates construction progress and reduces costs and logistical effort on the construction site. Since no fasteners have to be installed, this procedure, which represents a considerable burden for any residents, for example in the context of a subsequent attic conversion, can also be omitted.A further advantage is that such a composite floor, due to its strength, can be placed directly on a brick or concrete wall without the need for a conventional wooden support structure, which means that a composite floor can also be easily used in a brick or concrete building.

[0086] The composite floor can be supported, in particular, by supports. The supports can be designed as walls, for example, side walls or interior walls of a building, or as freestanding columns, for example, in larger rooms.

[0087] In particular, the supports can be provided for walls made of concrete and / or brick. It has been shown that a direct support of the floor slab on a masonry or concrete wall is easy to install, allowing a timber floor to be easily installed even in a brick or concrete building.

[0088] In particular, it can be provided that a composite prefabricated element 1 rests on two opposing supports. The composite prefabricated elements 1 can, in particular, have a length that corresponds at least to the distance between two opposing walls of a building. This makes it particularly easy to create a stable floor slab.

[0089] It can also be provided that at least one prefabricated composite element 1 is suspended from the connecting device 6. In this case, it can be provided that the prefabricated composite element 1 is merely suspended from the connecting device 6 or that it is additionally supported.

[0090] Preferably, it can be provided that the composite prefabricated element 1 has a defined application position depending on the direction of loading.

[0091] In the preferred use of the composite precast element 1 in question as a composite floor slab, the concrete layer 3 is arranged at the top and the tensile layer 2 at the bottom. As already mentioned above, the tensile layer 2 preferably forms the visible side 11.

[0092] Concrete layer 3 is preferably designed without reinforcement. This keeps production effort and costs to a minimum.

[0093] Alternatively, for certain special applications, the tensile layer 2 can comprise fiber-reinforced plastic and / or metal. It can also be provided that the tensile layer 2 is formed as a composite of wood and metal or wood and fiber-reinforced plastic, whereby the load-bearing capacity of the prefabricated composite part 1 can be further increased.

[0094] As previously mentioned, according to the invention, the tensile layer 2 has a predeterminable plurality of predeterminably shaped depressions on an inner side of the tensile layer facing the concrete layer 3. The depressions, which can also be referred to as notches, are preferably designed as blind holes and / or grooves. The depressions do not extend through the entire tensile layer 2 and are therefore not designed as through openings.

[0095] According to the invention, the concrete layer 3 engages the recesses of the tensile layer 2. This occurs during the production of the precast composite element 1, with liquid concrete being poured onto the tensile layer 2. Preferably, the recesses may have at least one undercut.

[0096] This further promotes the positive connection between concrete layer 3 and tensile layer 2. This also has a positive effect on the force transmission between tensile layer 2 and concrete layer 3 under load.

[0097] Preferably, the concrete layer 3 and the tensile layer 2 are formed as continuous layers. The only exceptions are openings that serve to pass through a supply line, such as a ceiling outlet for connecting a lighting fixture.

[0098] The concrete layer 3 forms, in particular, an outer side opposite the tensile layer 2 and facing away from the visible side 11 of the tensile layer 2. The tensile layer 2 is preferably not encompassed or enclosed by the concrete layer 3.

[0099] It can be provided that the tensile layer 2 extends laterally beyond the concrete layer 3 on all sides. This creates a grid of channels when forming a floor slab, which simplifies the installation of cables. Another advantage is that it is easy to connect the tensile layers 2 of adjacent precast composite elements 1 to each other on all sides, allowing several interconnected precast composite elements 1 to easily transmit horizontal tensile forces, thus forming a particularly strong bond.

[0100] It may further be provided that an empty pipe is arranged in the concrete layer 3. The empty pipe can be simply arranged before the concrete layer 3 is poured and thus easily arranged in the concrete layer 3. The empty pipe further simplifies the laying of cables, for example, to a centrally located lighting fixture.

[0101] To create highly resilient floor slabs, the composite floor slab can be internally prestressed and / or - in the unloaded state - be deflected.

[0102] The following are principles for understanding and interpreting the disclosure in question.

[0103] Characteristics are usually introduced with an indefinite article, "ein, eine, eines, einer." Therefore, unless the context indicates otherwise, "ein, eine, eines, einer" is not to be understood as a number.

[0104] The conjunction "or" is to be interpreted as inclusive and not exclusive. Unless the context indicates otherwise, "A or B" also includes "A and B," where "A" and "B" represent any characteristics.

[0105] A "substantially" in connection with a numerical value includes a tolerance of ± 10% around the stated numerical value, unless the context requires otherwise.

[0106] For ranges of values, the endpoints are included unless the context indicates otherwise.

Claims

1. Composite prefabricated component (1) comprising a tension layer (2) and a concrete layer (3) connected to the tension layer (2), at least one recess (4) being arranged in the tension layer (2), the concrete layer (3) engaging in the at least one recess (4) to form a form fit with the tension layer (2), at least one lifting anchor (5) is arranged at least partially in the concrete layer (3), a connecting device (6) of the at least one lifting anchor (5) is arranged on a side of the concrete layer (3) facing away from the tension layer (2), a load-bearing part of the at least one lifting anchor (5) is arranged within the at least one recess (4), wherein the at least one lifting anchor (5) comprises a first end (7) and a second end (8), wherein the connecting device (6) is arranged at the first end (7) and the second end (8) of the at least one lifting anchor (5) is arranged within the at least one recess (4), characterised in that in that the load-bearing part of the at least one lifting anchor (5) has at least one disc-shaped or plate-shaped widening (9).

2. Composite prefabricated part (1) according to claim 1, characterised in that the at least one recess (4) is a blind hole.

3. Composite prefabricated component (1) according to claim 1 or 2, characterised in that the diameter of the at least one recess (4) narrows essentially continuously from the tension layer (2) in the direction of the concrete layer (3).

4. Composite prefabricated component (1) according to one of the claims 1 to 3, characterised in that the at least one recess (4) tapers conically from the tension layer (2) in the direction of the concrete layer (3).

5. Composite prefabricated component according to one of the claims 1 to 4, characterised in that the at least one recess (4) encloses a flank angle of preferably greater than or equal to 45°, in particular greater than or equal to 60°.

6. Composite prefabricated component (1) according to one of the claims 1 to 5, characterised in that the second end (8) is embodied as a load-bearing part.

7. Composite prefabricated component (1) according to one of the claims 1 to 6, characterised in that the load-bearing part of the at least one lifting anchor (5) has a plurality of rib-shaped and / or knob-shaped extensions (10).

8. Composite prefabricated component (1) according to one of the claims 1 to 7, characterised in that the concrete layer (3) and the tension layer (2) are embodied as continuous layers.

9. Composite prefabricated component (1) according to one of the claims 1 to 8, characterised in that a form-fitting connection between the tension layer (2) and the concrete layer (3) is essentially only achieved via the part of the concrete layer (3) arranged in the at least one recess (4) of the tension layer (2).

10. Composite prefabricated component (1) according to one of the claims 1 to 9, characterised in that the tension layer (2) is embodied as a wooden layer.

11. Composite prefabricated component (1) according to one of the claims 1 to 10, characterised in that the composite prefabricated component (1) is embodied as a composite plate, in particular as a composite ceiling plate.

12. Composite slab comprising at least one composite prefabricated component (1) according to one of claims 1 to 11.

13. Method for producing a composite prefabricated component (1) according to one of claims 1 to 11, wherein a plate of a tension-resistant material is used as the tension layer (2) for the composite prefabricated component (1), at least one recess (4) being produced in the tension layer (2), at least one lifting anchor (5) being arranged in such a way that a load-bearing part of the lifting anchor (5) is arranged in the at least one recess (4) and a connecting device (6) of the at least one lifting anchor (5) is arranged outside the at least one recess (4), the at least one lifting anchor (5) having a first end (7) and a second end (8), the second end (8) of the at least one lifting anchor (5) being arranged within the at least one recess (4), the load-bearing part of the at least one lifting anchor (5) having at least one disc-shaped or plate-shaped widening (9), wherein, to form a concrete layer (3) connected in a form-fitting manner to the tension layer (2), concrete is poured onto the tension layer (2) in a casting process, wherein the concrete penetrates into the at least one recess (4) in the casting process and thereby substantially envelops the load-bearing part of the at least one lifting anchor (5), wherein, after the casting process, the connecting device (6) of the at least one lifting anchor (5) is arranged on a side of the concrete layer (3) facing away from the tension layer (2) and on the first end (7) of the lifting anchor (5).

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