EP2216455B1 - Connection element for wood compound, wood compound and method for production of same - Google Patents

Abstract

The element has a sheet element made of metal and/or plastic and comprising a hole, where surrounding of the connection element forms a bearing surface for a lower side of a head of a pin-like fastening element e.g. screw or nail. A pin (6) of the sheet element comprises a cylindrical section (9) with a diameter larger than the hole, and another section (7) with a diameter smaller than the hole. The pin is detachably inserted into the hole of the sheet element. A fixing device fixes the pin against the sheet element in an aligned position. An independent claim is also included for a method for producing a wood-concrete composite.

Description

The invention relates to a connecting element for the wood concrete composite.

Apartment ceilings are often produced as a so-called wood concrete composite. This concrete ceilings are on wooden beams, with which they must be connected. A wood-concrete composite combines the respective favorable properties of the two building materials. The wood-concrete composite leads to an increased rigidity and thereby fulfills increased requirements for the proof of the serviceability of apartment ceilings.

To transfer the thrust in the shear joint between the concrete component and the wooden beam, there are different connectors with building inspectorate approval. These also include full-thread screws. These are screwed into the wooden structures. Subsequently, the wet concrete is applied to the wooden structures. When setting, the protruding from the wooden structure part of the screw connects to the concrete. Basically, there are currently two different ones Methods of making such a composite. One variant consists in the fact that the element made of concrete and wooden beams is completely factory-made and then transported in one piece and mounted on the construction site. The joinery, namely the cutting of the wood, and the concreting work must be carried out by a single company.

The second variant is that the wooden structure is pre-assembled at the construction site. Then the reinforcement is introduced, the ceiling supported and the concrete applied wet. This leads to downtime on the construction site, requires the coordination of the individual trades, leads to moisture in the timber construction and to the contamination of possible visual constructions.

There is already known a fastener for fastening a wooden beam on a concrete sleeper, in which in the concrete sleeper an angled pin is embedded in concrete, which is provided at its protruding from the concrete sleeper end with a thread ( US 3852931 ).

Also known is an insert element for generating screw channels in a flat concrete element, in which four obliquely extending tubes are attached to a metal plate. Through the pipes a screw is screwed in each case ( DE 102006043209 A1 ).

Furthermore, it is known to screw a screw through a first tube, and then put on the screwed screw a second larger tube ( DE 10341401 A1 ).

The invention is based on the object to provide a way to realize the wood concrete composite faster and easier.

To achieve this object, the invention proposes a connecting element with the features of claim 1, a wood composite containing such a connecting element and a method for producing a wood-concrete composite. Further developments of the invention are the subject of dependent claims.

The connecting element is a very simple and very easy to use element. It serves to absorb and transmit the shear forces of the shear joint. The disk element forms around the hole in it a contact surface for the underside of a pin-shaped fastener, such as a screw. The holder serves to support the disk element during the production of the concrete layer. After making and curing the concrete layer, the disc element is supported by the concrete layer itself. The channel forming means serves to keep a space clear of the concrete. This space, which passes from the top of the concrete element to its underside, serves to insert the connecting element. He is referred to here for the sake of simplicity as a screw, even if the connecting element does not necessarily need to be a screw.

For example, the channel-forming means may be a tube which remains in the concrete after the concrete has hardened.

It can be provided that the channel-forming means is at least partially a part of the holder for the disc element.

Another possibility proposed by the invention is that the holder consists of an easily destructible material at least in the region of the channel to be formed. Then, the area of the channel after curing is not empty, but filled with a material. Since the material is easily destructible, can the screw then be opened by the insertion of the connecting element. As material for this example Styrodur comes into question.

A still further possibility, proposed by the invention, may consist in that the channel-forming means has a separate component which can be inserted detachably into the hole of the disk element and which is pulled out after the concrete layer has hardened. In particular, it can be provided in a development that this separate component is a pin with two sections of different diameters.

The pin, whose first cylindrical portion has a larger diameter than the hole in the sheet metal element, serves to make in the concrete the channel through which the fastener can be inserted and through which a tool can be engaged with the fastener , The diameter of this pin and thus the diameter of the channel to be produced must therefore be at least as large as the diameter of the head of the later to be used Befestigungselelements.

The length and dimensions of the pin are selected so that when the end of the smaller diameter portion is located in the plane of the bottom of the concrete part to be manufactured later, the top end extends at least to the top of the concrete part to be made.

According to the invention, it can be provided that the transition between the two sections of the pin corresponds to the shape of the underside of the head of the fastening element.

The pin is to be pulled out again after producing the concrete element become. He must therefore be releasably connected to the sheet metal element. Since it specifies the direction of the fastening element to be used later, according to the invention, a fixing device can be provided which fixes the pin in the aligned position relative to the sheet metal element and thus to the underside of the concrete element to be produced.

This fixing device can be effective for example between the edge of the hole in the sheet metal element and the pin. It can be a kind of thread.

According to the invention it can be provided that the free end of the portion of the pin with the smaller diameter is formed flat, so that the hole produced by the pin passes completely through to the bottom of the concrete element.

In order to correctly position the sheet metal element with respect to the concrete part to be produced, a holder may be provided. This holder may in particular also have a holder for the pin itself, so that the fixing device is present on this holder for the sheet metal element.

As a fastener in particular a screw in question.

Because of the transmission of shear forces, it makes sense to orient the sheet metal part so that the voltage applied to its contact surface screw extends obliquely to the separation plane or joint plane between the concrete part and the wooden beam. In order to facilitate such an orientation, it can be provided according to the invention that the sheet metal part is formed in two parts, wherein the portion having the hole is bent or bent relative to the remaining part. Then the part not having the hole can be made parallel to the underside of the shuttering or of the shuttering using the shuttering Orient the concrete part. This is easier than keeping an angle between this bottom and the sheet metal part.

In order to use the connecting element with the threaded holes usually provided with a countersunk head particularly useful, the invention proposes in a further development, to provide the contact surface of the sheet metal element which is formed around the hole with a countersink. It makes sense in this case also, if the transition of the pin between the part with the larger and the part with the smaller diameter is formed in the same way conical.

The holder, which is required essentially only during the production of the concrete layer, can be realized in a further development of the invention in a common component with the disc element.

According to the invention, the connecting element can be designed so that the channel-forming agent is removed after the setting of the concrete. For this serves as an example of the aforementioned pin. However, it is also possible and is proposed by the invention that the channel-forming agent remains as part of the connecting element after the setting of the concrete. For this purpose, pipe sections can be used. For example, it may be provided that the channel-forming means above and / or below the disc element is formed by a pipe section. This pipe section may for example consist of plastic. It is possible to connect the two pipe sections with each other and / or with the disk element. This makes it possible to adjust the length of the channeling means to the thickness of the concrete slab.

The invention also proposes a wood-concrete composite in which a concrete element rests flat on a connecting surface on at least one timber construction. The concrete element contains at least one connecting element, preferably a multiplicity of connecting elements, engage through the disc element through fasteners in the wooden structures. This results in a shear-resistant connection between the wooden structure and the concrete element.

In this case, the connecting elements can be arranged so that the fastening element extends obliquely or perpendicular to the connecting surface between the concrete element under wooden construction. With a variety of fasteners, it may be useful to combine these possibilities with each other.

The disc member may either be spaced from the bonding surface or, if it is non-corrosive, may also be in the bonding surface.

The method proposed by the invention can proceed as follows. In a formwork for producing a concrete element is at the points where later the connection should be done with wooden beams at least one connecting element, preferably a plurality of connecting elements introduced. This happens, for example, using the bracket. Subsequently, concrete is poured into the formwork. After setting of the concrete, the concrete element is placed on a wooden structure, in the screw channel and through the hole of the disc member of the connecting element, a fastener is inserted and introduced into the wooden structure and connected there with this.

Preferably, the concrete element is factory made, while the compound of the finished concrete element is carried out with the timber construction on the site.

For example, a pin can be used to make the screw channel, which is prior to pouring the concrete into the hole of the Disc element is inserted, and also extends to the underside of the concrete part to be produced and at the top to the boundary surface of the concrete part. He can survive there too. The concrete is then poured in and serviced until the concrete sets. After setting the pins are either pulled out in the factory or at the construction site.

The finished concrete slabs are then transported to the construction site and placed on the previously completed wooden structures. In the channels formed by the pins, the fasteners are inserted and connected through the channels with the wooden structures.

The axis of the channel can run, for example, perpendicular to the connecting surface between the concrete element and the wooden structure.

However, it is also possible and within the scope of the invention that the axis of the channel runs obliquely with respect to the connection plane between the concrete element and the timber construction.

According to the invention can be provided that the sheet metal elements are provided with brackets, which consist for example of plastic, and that these brackets are inserted together with the sheet metal elements previously inserted into it in the formwork. These brackets can also serve to ensure proper alignment of the pins.

The screw is also formed by the fact that the screw is pressed into the material of the holder from above and thereby makes its way through the bracket itself.

If a connecting element is used with a channel-forming means in the form of a tube, so that the screw channel after the setting of the concrete is already finished.

The proposed by the invention connecting element is suitable for prefabricated concrete slabs in thicknesses from 6 - 7 cm. The finished concrete slabs are placed on the wooden structures and connected to the wooden structure via full-thread screws, partial thread screws or other pin-shaped connecting means. The composite of the individual elements is produced via the subsequent screw connection. This variant has several advantages over the conventional methods.

The assembly of the wooden structures can be done largely independent of the concreting work.

An additional support when applying the concrete slabs is not required because the composite can be made immediately with the laying of the plates.

Lifetime from setting times of the concrete no longer arise on the construction site itself.

The concrete slabs, including the fasteners, can be manufactured in precast plants, delivered to the construction site and laid directly.

Moisture due to the application of concrete on the construction site no longer arises.

The timber construction company on the construction site can take over the coordination of the element production.

There is no pollution of the wooden structures by concreting more.

Concrete slabs with a finished underlayer can be used.

Continuous carriers can be used.

Figur 1

ein Blechteil eines Verbindungselements nach der Erfindung;

Figur 2

die Seitenansicht eines zu dem Blechteil gehörenden Zapfens;

Figur 3

die Anordnung des Verbindungselements mit Zapfen;

Figur 4

einen Querschnitt durch einen Teil eines Holzbetonverbunds in einer ersten Richtung;

Figur 5

einen Querschnitt durch einen Teil eines Holzbetonverbunds in einer zweiten Richtung;

Figur 6

die Seitenansicht einer Halterung für ein Verbindungselement;

Figur 7

die Ansicht der Halterung von links in Figur 6;

Figur 8

eine perspektivische Darstellung eines Verbindungselements einer weiteren Ausführungsform;

Figur 9

eine der Figur 8 entsprechende Darstellung einer nochmals weiteren Ausführungsform;

Figur 10

eine nochmals weitere Ausführungsform;

Figur 11

eine der Figur 4 entsprechende Darstellung einer weiteren Ausführungsform;

Figur 12

die Anordnung der Figur 11 mit einem Abstandhalter;

Figur 13

eine Ansicht des Beschlagelements der Figur 11 von rechts in Figur 11;

Figur 14

eine Ansicht des Beschlagelements der Figur 11 von links in Figur 11;

Figur 15

eine schematische Seitenansicht eines weiteren Verbindungselements;

Figur 16

eine Seitenansicht eines nochmals weiteren Verbindungselements;

Figur 17

eine Ansicht des Verbindungselements der Figur 16 von rechts unten in Figur 16

Figur 18

die perspektivische Ansicht einer weiteren der Figur 16 ähnlichen Ausführungsform;

Figur 19

die perspektivische Ansicht eines Teils des Verbindungselements der Figur 18;

Figur 20

einen Axialschnitt durch das Verbindungselement der Figur 18.

Further features, details and advantages of the invention will become apparent from the claims and the abstract, the wording of which is incorporated by reference into the content of the description, the following description of preferred embodiments of the invention and with reference to the drawing. Hereby show:

FIG. 1

a sheet metal part of a connecting element according to the invention;

FIG. 2

the side view of belonging to the sheet metal part pin;

FIG. 3

the arrangement of the connecting element with pin;

FIG. 4

a cross-section through a portion of a Holzbetonverbunds in a first direction;

FIG. 5

a cross-section through a portion of a Holzbetonverbunds in a second direction;

FIG. 6

the side view of a holder for a connecting element;

FIG. 7

the view of the bracket from the left in FIG. 6 ;

FIG. 8

a perspective view of a connecting element of another embodiment;

FIG. 9

one of the FIG. 8 corresponding representation of yet another embodiment;

FIG. 10

a still further embodiment;

FIG. 11

one of the FIG. 4 corresponding representation of another embodiment;

FIG. 12

the arrangement of FIG. 11 with a spacer;

FIG. 13

a view of the fitting element of FIG. 11 from the right in FIG. 11 ;

FIG. 14

a view of the fitting element of FIG. 11 from the left in FIG. 11 ;

FIG. 15

a schematic side view of another connecting element;

FIG. 16

a side view of yet another connecting element;

FIG. 17

a view of the connecting element of FIG. 16 from the bottom right in FIG. 16

FIG. 18

the perspective view of another of the FIG. 16 similar embodiment;

FIG. 19

the perspective view of a part of the connecting element of FIG. 18 ;

FIG. 20

an axial section through the connecting element of FIG. 18 ,

First to FIG. 1 , Here, a sheet metal element 1 is shown, which has approximately rectangular shape. Between its two longitudinal sides 2, a kink 3 is formed which extends obliquely to the two longitudinal sides 2. On one side of this bend 3, a hole 4 is formed approximately in the middle of this part. The hole 4 is surrounded by a countersink 5. The sheet metal part 1 is bent around the bend 3, wherein the right in Figure 1, the hole 4 having part forms an angle of about 45 ° relative to the left no hole having part. Since the angling occurs around a sloping crease line 3, the plane of the right part forms an angle in two directions with respect to the left part.

To the connecting element of the embodiment shown here is not only the sheet metal part in FIG. 1 is shown, but also a pin 6, in FIG. 2 is shown. This pin 6 contains two cylindrical parts with a circular cross section, both of which have a different diameter. The lower part 7 of the pin 6 has a diameter which is slightly smaller than the diameter of the hole 4 in the sheet metal element 1. The lower end of this part is cut off obliquely and forms a flat end face 8. The other part 9 of the pin 6 points a diameter which is larger than the diameter of the hole 4. The diameter of this part 9 of the pin 6 corresponds to the diameter of the screw head of a screw which is intended to cooperate with the connecting element. The outer diameter also corresponds to the outer diameter of the countersink 5.

The sheet metal element 1 off FIG. 1 is temporarily fixed in a formwork in the way, as the FIG. 3 suggests. The left no hole having part of the sheet metal element 1 is arranged parallel to the bottom 10 of the manufactured concrete part or the top of the casing. Then the right the hole 4 having part of the sheet metal element 1 is already in the desired inclination. Subsequently, the pin 6 is inserted from the top of the shuttering forth in the hole 4. He is oriented so that his face 8 just rests on the top of the casing. Of course, the length of the pin 6 is chosen so that its upper end 11 projects beyond the top of the concrete part to be produced at least so far that there opens the hole. Furthermore, the pin 6 is matched to the arrangement of the sheet metal element 1, that when the end face 8 of its section 7 lies in the bottom 10 of the concrete element to be produced, at the same time the transition between the two sections 7, 9 takes the place where later Bottom of the screw head rests on the sheet metal element 1.

Of course, several such fasteners are introduced in the formwork.

Then the concrete is poured into the formwork and waited until it is set. Then the pins 6 are pulled out of the concrete part. This creates screw channels into which the screws can later be inserted. The pins 6 can be used as often as desired.

Subsequently, the concrete part thus produced is brought to the site and placed on the wooden beam construction. Of course, the fasteners must be present at the points in the concrete part, which later are the wooden beams. Through the screw channels, the countersunk screws are now used and screwed into the wooden structure. In the example just mentioned wooden beams are used. The connection between the concrete part and wooden structures is also applicable to wooden structures of other types, namely in flat Wooden construction elements, board stacks, cross laminated timber or the like.

The result of such an arrangement is in FIGS. 4 and 5 shown. The cut of the FIG. 4 shows a wooden beam 12 below a concrete ceiling 13. In the concrete floor 13, a plurality of connecting elements are included, of which the section of the FIG. 4 a single sheet metal part 1 shows. The full-threaded screw 14 is only hinted at. Above the sheet metal part 1, which is surrounded on all sides by concrete, a screw 15 is formed in extension of the screw, at the points where previously the pin 6 was arranged.

The cut of the FIG. 5 from a 90 ° offset direction also shows how the sheet metal parts 1 of the connecting element are surrounded on all sides by concrete. Again, the screw 15 can be seen, through which access to the top of the screw head of the screws 14 is possible through. From the comparison of the cuts of FIGS. 4 and 5 It can be seen that the screws 14 are inclined in two directions, that is obliquely in the plane of the longitudinal direction of the wooden beam 12 and obliquely in a plane perpendicular to this longitudinal direction.

While in the treatment of FIG. 3 is only hinted that the connecting element is arranged at a distance from the bottom 10 of the concrete element to be produced by the shuttering 13 shows the FIG. 6 and the FIG. 7 a way how this compliance with the distance can be achieved. For this purpose, a holder 20 is used, which consists for example of plastic. The holder 20 includes a bottom part 21 in the form of a plate with a flat bottom. This bottom plate 21 is placed for example on the shuttering board and glued there. The top of the formwork board forms the bottom 10 of the concrete part to be produced 13. The bottom plate 21 has two lateral upwardly projecting wings 22, see the front view of FIG. 7 , On their inner sides facing each other have these two wings 22, which are flat and parallel to each other, at the same height in each case one perpendicular to the plane of the FIG. 7 extending groove 23. The width of the groove 23 corresponds to the thickness of the sheet metal part 1 of the connecting element. The connecting element can thus be inserted into these grooves 23, wherein due to the described perpendicular to the plane of the paper extending course of the grooves 23 which no hole having part of the sheet metal element 1 extends parallel to the underside of the plate member 21.

On the plate member 21, a sleeve 24 is placed, for example integrally formed. This sleeve 24 has a through hole 25 which is intended to receive the front end portion of the portion 7 of the pin 6. The hole 25 of the sleeve 24 extends coaxially to the hole 4 in the sheet metal part 1 of the connecting element. In this way, the pin 6 can be aligned both with respect to the sheet metal element 1 and with respect to the underside 10 of the concrete element 13 to be produced. The distance of the sheet metal element 1 from the bottom 10 of the concrete element 13 and the angle of the axis of the hole 4 are selected and the pin 6 is formed so that when the pin 6 with its transition between its two sections 7, 9 on the contact surface the sheet metal element 1 rests, at the same time its flat end face 8 in the bottom 10 of the concrete part 13 is located.

The previously discussed embodiments of FIGS. 1 to 7 are formed so that the axis of the fastening element, preferably a screw, extends obliquely with respect to the underside 10. But it is also possible to use as a fastener a screw or a pin which is perpendicular to the bottom 10. In this case, a sheet metal element 31 may be used, which has a central portion 32 with the hole 4, which is arranged in the formwork so that it is parallel to the bottom 10. For the transmission of the shear forces, the sheet metal element 31 then has one or two lateral wings 33, which are preferably perpendicular to the central portion 32 run. The arrangement can be made as the FIG. 8 shows, or vice versa, as in FIG. 9 shown.

Even in such an embodiment as the FIGS. 8 and 9 show a slightly oblique course of a fastener to allow the sheet metal element and the shape of the FIG. 10 occupy, in which a central portion containing the hole 4 36 is disposed slightly obliquely opposite the bottom 10, wherein the two wings 37 and 38 have different lengths.

The in the FIGS. 6 and 7 shown holder 20 may be a single element, so that a separate holder is provided for each connecting element. But it is also conceivable that a continuous bottom plate with a plurality of paired wings 22 and sleeve 24 is used.

It is also conceivable that a plurality of bottom plates is connected to each other by thin films.

At the in FIG. 11 1, the connecting element 41 is designed as an angle element with two legs 42, 43 extending approximately perpendicular to one another. The angle element is oriented so that the ends of the two legs 42, 43 rest on the shuttering board, later so in the separation surface between the concrete 13 and the timber beam 12. The two legs 42, 43 have a length such that the predetermined or desired angular orientation between the screw 14 and the separating surface is achieved or made possible. The longer leg 42 may have an opening, see FIG. 13 , which ensures that the concrete can penetrate easily under the connecting element.

In the arrangement of FIG. 12 gets on the formwork board first a spacer 44 is placed, and then on this spacer 44 then the connecting element 41. The spacer may be a very simple and inexpensive plastic element which either has a through hole for the shank of the screw 14 or which is pierced when screwing the screw.

Now to the embodiment of FIG. 15 , Here, the holder 50 is formed by a body of zerbröselndem or otherwise easily destructible material having a flat base 51 and a plane extending parallel to this flat surface 52. The distance between these two flat boundary surfaces 51, 52 corresponds to the thickness of the concrete layer to be produced. In the inclined side surfaces 53, 54 recesses 55 are formed, penetrates into the later concrete. The body has an obliquely opposite to the boundary surfaces 51, 52 extending slot 56, in which a disk element is used with a central hole. Below the slot 56 for the disk element is a channel 57 is formed with the central hole in alignment, which passes through to the base 51 of the body 50 of the holder. If such a holder 50 is inserted into the formwork with the disc element and the formwork is filled with concrete, the space occupied by the body remains free of concrete, as well as the channel 57. After curing, the surface 52 of the holder is in the top of the concrete element 50 visible. It can be pressed a screw which penetrates the body and thereby forms the screw in the body of the holder 50 itself.

The holder 50 is significantly narrower in a direction perpendicular to the plane of the drawing than the corresponding extent of the disc element, so that the disk element rests on the concrete during the stress of a guided through its hole screw with its underside and only a small part of the holder ,

The FIG. 16 shows a further holder 60, which has a foot member 61 with a pipe socket 62, 63 contains. The upper pipe socket 63 has a larger diameter than the lower pipe socket 62. The two pipe sockets 62, 63 are connected to each other by a sleeve 64. The upper end of the pipe socket 63 is closed by means of a thin plate 65. To the connecting element of FIGS. 16 and 17 also includes a disc member 66, which has a recess 67 open on one side instead of a central hole. The disc member 66 is inserted from below into the sleeve 64 until it in FIG. 17 has shown position. The transverse extent of the recess 67 corresponds to the diameter of the lower pipe socket 62, which in turn corresponds approximately to the shank diameter of a screw. This means that the underside of the screw head rests on the edge of the disk element 66.

The following FIGS. 18-20 show a holder 70 which is constructed similar to the holder 60 of the FIGS. 16 and 17 , It consists in the example shown of plastic and is made of several parts. The holder 70 includes a foot plate 71, which is round in the example shown. Starting from the foot plate, the lower pipe section 72 extends obliquely upward, at an angle which is for example 30 °. The upper end of the lower tube portion 72 terminates in a respect to the outer diameter of the tube section 72 projecting plate 73. This plate 73 merges into the base plate 71, for which purpose the foot plate 71 has an extension 74. This extension is in the FIGS. 18 and 19 to see.

Between the pipe section 72 and the extension 74 of the foot plate 71, a perpendicular to the base plate extending web 75 is formed, which forms a reinforcement. The cut of the FIG. 20 goes right through this bridge 75 through. From the base plate 71 facing away from the top of the lower tube section 72 integrally formed plate 73 protrude in the example shown four locking pin 76 upwards. These locking pins 76 include a provided with two outer locking lugs Head and a longitudinal slot. The locking lugs are formed outside of the extension of the lower pipe section 72 arranged central opening of the plate 73.

On the plate 73, an enlarged intermediate plate 77 is placed, which has at the locations where the locking pins 76 are arranged, through openings. The intermediate plate 77 forms the disc element here. The intermediate plate 77 also includes a central through hole for the head of the fastening screw. The intermediate plate 77 increases the contact surface for the fastening screw. It is made of stronger material, it may optionally consist of a different material. On the top of this intermediate plate 77 then another pipe section 78 is placed, which has a foot plate 79. In the base plate 79 openings are formed through which the locking pin 76 engage through. The heads of the locking pin 76 are in the FIG. 18 just to see. The locking pin 76 thus serve to set the upper pipe section 78 to the lower pipe section 72. The upper tube section 78 may be made of thinner material. Its task is to keep a screw free. Similar to the embodiment of the FIGS. 16 and 17 the upper tube section 78 is closed by a cover 79, which can be easily separated by appropriate design. The FIG. 20 shows the interaction of such a holder 70 with the fastening screw. The embodiment of the holder, which in the Figures 18-20 is shown, it makes it possible to adapt an adaptation of the holder to different thicknesses of the concrete slab to be produced by replacing the upper tube section 78.

Marks in the form of ribs 80 are formed on top of the foot plate 71 to facilitate alignment of the holder 70 in the formwork prior to pouring the concrete. In the example shown, the ribs 80 extend in extension of the projection of the longitudinal direction of the screw channel or transversely thereto. Other directions are also possible.

To produce a wood-concrete composite, it is proposed to insert into the formwork for the production of the concrete part one or more connecting elements which each have a disk element with a recess. The environment of this recess forms a contact surface for the underside of a screw head. The connector includes means to prevent the passage of sewer concrete into any later openable screws. Subsequently, concrete is poured into the formwork, and after the setting of the concrete, a screw is inserted through the screw channel, which is passed through the recess of the disc element of the connecting element due to the arrangement of the screw channel and screwed into the arranged under the concrete part of wooden construction.

Claims (13)

1. Connection element for the wood concrete composite, comprising

   1.1 an at least approximately flat disc element (1) consisting of metal and/or plastic which

   1.2 has a recess (67) which is designed in particular as a hole (4) and

   1.3 the surroundings of which forms a contact surface for the lower side of the head of a pin-like fastening element (14),

   1.4 a mounting (20) for the mounting of the disc element (1), and also comprising

   1.5 a channel-forming means for forming a screw channel leading through the recess (67) or through the hole (4) in the disc element (1, 66), wherein

   1.6 the channel-forming means is at least partially part of the mounting (20), and the mounting, at least in the region of the channel to be formed, is composed of a material which is easily destructible by a screw being pushed in, and/or

   1.7 the channel-forming means is formed above and/or below the disc element (64, 77) by a tubular section (62, 63; 72, 78), wherein the tubular sections (62, 63; 72, 78) on both sides of the disc element (64, 77) are optionally connectible to each other and/or to the disc element (64, 77).
2. Connection element according to Claim 1, wherein the channel-forming means has a separate structural element which is insertable releasably into the hole (4) in the disc element (1) and is designed in particular as a pin (6) which has a first cylindrical section (9) with a diameter which is larger than the hole (4) and a second section (7) with a diameter which is smaller than the hole (4).
3. Connection element according to either of the preceding claims, wherein the disc element is designed as a sheet-metal element (1) which is composed of two at least approximately flat parts which are arranged with respect to each other at an angle which lies within the range of approximately 0° to approximately 90°, wherein the hole (4) is arranged in one of the two parts.
4. Wood concrete composite, comprising

   4.1 a concrete element (13)

   4.2 in which at least one connection element according to one of the preceding claims is arranged, and also comprising

   4.3 at least one wooden construction (12) which

   4.4 bears along a connection surface in a planar manner against the lower side of the concrete element (13) and

   4.5 is connected, in particular screwed, to the concrete element (13) with the aid of a fastening element (14) inserted through the hole (4) in the connection element.
5. Wood concrete composite according to Claim 4, wherein the fastening element (14) runs obliquely or perpendicularly to the connection surface between the concrete element (13) and the wooden construction (12).
6. Wood concrete composite according to Claim 4 or 5, wherein the disc element (1) having the hole (4) is at a distance from the connection surface between the concrete element (13) and the wooden construction (12).
7. Wood concrete composite according to Claim 4 or 5, wherein the disc element (1) having the hole (4) is composed of non-corroding material and is arranged with its lower side in the connection surface between the concrete element (13) and the wooden construction (12).
8. Method for producing a wood concrete composite, comprising the following method steps:

   8.1 at least one disc element (1) of a connection element according to one of Claims 1 to 3 is introduced into a formwork for producing a concrete element (13),

   8.2 the concrete is cast into the formwork,

   8.3 after the concrete has set, the concrete element (13) is placed onto a wooden construction (12),

   8.4 a screw channel leading through the hole (4) in the disc element (1) is formed,

   8.5 a fastening element (14) which is designed as a screw is inserted into the screw channel and through the hole (4) in the disc element (1) and 8.6 is screwed into the wooden constructions (12) until

   8.7 the screw bears with the lower side of its screw head against the surroundings of the hole (4).
9. Method according to Claim 8, wherein the concrete element (13) is produced at a factory and the connection to the wooden construction (12) is carried out at the building site.
10. Method according to Claim 8 or 9, wherein the disc element (1) is fitted in the formwork in such a manner that the axis of the hole (4) and therefore the channel (15) formed by the pin (6) runs obliquely with respect to the connection plane between the concrete element (13) and the wooden construction (12).
11. Method according to one of Claims 8 to 10, in which at least one mounting for the connection element is introduced, optionally together with the latter, into the formwork in order to produce the concrete element (13).
12. Method according to one of Claims 8 to 11, wherein a connection element according to Claim 1 is used, and the screw channel is opened by destruction of the mounting with the aid of the fastening element.
13. Method according to one of Claims 8 to 11, wherein a connection element according to Claim 2 is used, and the screw channel is opened by removal of the separate component.

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