WO2004016874A1

WO2004016874A1 - Composite concrete slab and fixing anchor for joining two concrete slabs

Info

Publication number: WO2004016874A1
Application number: PCT/DE2003/002472
Authority: WO
Inventors: Hans Frisch
Original assignee: Hans Frisch
Priority date: 2002-07-23
Filing date: 2003-07-23
Publication date: 2004-02-26
Also published as: DE20211116U1

Abstract

The invention relates to a fixing anchor (1) for joining a first reinforced concrete slab (15), preferably an exterior concrete slab, and a second reinforced concrete slab (16), preferably an interior concrete slab, an insulating layer (17) being disposed between said concrete slabs (15, 16). The inventive fixing anchor (1) is made of flat steel and is hooked to the reinforcements (12, 13, 14). The invention also relates to a composite concrete slab comprising two reinforced concrete layers (15, 16) and an intermediate insulating layer (17), in which said fixing anchors (1) are used for joining the reinforcements.

Description

description

COMPOSITE CONCRETE PANEL AND HOLDING ANCHOR FOR CONNECTING TWO CONCRETE PANELS

The invention relates to a retaining anchor for connecting a first reinforced concrete slab and a second reinforced concrete slab, wherein an insulating layer is arranged between the concrete slabs and a composite concrete slab consisting of at least a first reinforced concrete slab, a second reinforced concrete slab and an insulating layer, at least one holding anchor for Connecting the concrete slabs between the first and second reinforcement is attached.

Similar retaining anchors and composite concrete slabs are generally known. Composite concrete slabs with internal insulation layers are being used more and more frequently in construction to improve thermal insulation, whereby components are sometimes also prefabricated in factories and the complete composite slab is transported to the construction site. So-called retaining anchors are necessary for the connection between the concrete slabs, both for the prefabricated elements and for the composite concrete slabs produced on the construction site, since the insulation material lying between the concrete slabs is not able to absorb the tension that may occur during manufacture, transport and construction - and absorb shear forces. The known retaining anchors are mostly made of bent wires. In the manufacturing process of the composite concrete slab, these are hooked into the reinforcement of the first cast concrete slab, then the insulation layer is applied, at least part of the reinforcement of the overlying concrete layer is hooked into the upright anchor and the next concrete layer is poured.

A problem with the known retaining anchors is that they do not have sufficient strength in load tests and only tolerate relative movements of the concrete layers of the composite panel to a small extent. The experiment was large The use of retaining anchors, consisting of much thicker round steel or wide metal plates, also failed because the material also broke quickly or the surroundings around the retaining anchor were affected by fractures.

It is therefore an object of the invention to find a retaining anchor for connecting two reinforced concrete slabs with an intermediate insulation layer, which has an improved and sufficient strength and at the same time, however, does not cause any damage to the concrete in the immediate vicinity when the concrete slabs move relative to one another.

This task is solved by the features of the independent patent claims. Advantageous developments of the invention are the subject of subordinate claims.

The inventor has recognized that it is cheaper to use relatively easily bendable flat steels for the retaining anchors than the currently used round steels, since these have proven to be significantly less sensitive to frequently occurring bending forces, with the same use of material.

Accordingly, the inventor proposes to further develop the holding anchor known per se for connecting a first reinforced concrete slab, preferably a concrete outer slab, and a second reinforced concrete slab, preferably a concrete inner slab, with an insulating layer being arranged between the concrete slabs, in such a way that the holding anchor is made of Flat steel exists and this has to be hooked into the reinforcement.

The holding anchor according to the invention made of flat steel preferably has an elongated shape similar to an elongated U-shape, consisting of two longitudinal legs and a connecting web. To improve the use of the retaining anchors, it is also advantageous to provide the longitudinal legs in the region of the connecting web with lateral cutouts. These recesses make it possible to simply hook the retaining anchors from below into a cross of a reinforcement mat during assembly, the retaining anchors jamming with the reinforcement in such a way that they come to stand upright. Such recesses can, for example, be milled out or punched out more easily. Here, however, it is also within the meaning of the invention if the excess material is not only simply removed during the punching process, but it can also be pushed away laterally as a nose, so that a type of embossing groove is created, into which the round steel bars of the reinforcement can be inserted.

The lateral recesses can have a height that corresponds to the height of the wire cross of a reinforcement mat into which the retaining anchor is to be hooked. Basically, this is about twice the diameter of the wires that make up the cross.

A further variant can consist in that each leg in the area of the connecting web has a recess on each side, which can each include a wire of a reinforcement mat, the recesses being arranged offset in height in accordance with the arrangement of the wires in a cross of a reinforcement mat ,

In addition, however, each leg in the area of the connecting web can have an additional cutout on each side, which can each include a wire of a reinforcement mat, so that there are two cutouts on each side of the longitudinal leg of the retaining anchor in the area of the connecting web. This means that there are more recesses than necessary, but the retaining anchor fits into any wire cross and it is not necessary to ensure that the retaining anchor is correctly aligned with the wire cross during assembly. The lateral recesses can be designed, for example, approximately semicircular or rectangular or triangular, and the corners can also be rounded.

According to a further variant of the design of the holding anchors, the longitudinal legs can have opposite openings in the region of the connecting web, through which the wire of a reinforcement can be guided.

The retaining anchors advantageously have longitudinal legs, which have a configuration at their free end which enables them to be hooked to a reinforcement arranged at this end.

For example, each longitudinal leg can have an opening at its free end through which a reinforcing bar can be inserted. This creates a secure connection between the reinforcement of two concrete layers.

Another possibility is to provide the free ends of the longitudinal legs with a shape such that these two ends can be simply connected to one another, preferably clipped on. Such a shape can be produced, for example, by a punching process which punches a slot in one free end and pushes out a slightly curved tab at the other free end, which can be pressed into the slot and bends open again after being pressed through, so that a good connection between the two Ends.

In principle, for easier connection of both ends, the longitudinal legs can also be of different lengths, so that one of the free legs can be bent around a wire of the second reinforcement and then connected to the second end of the retaining anchor. According to a further embodiment of the invention, a separate connecting element, preferably a screw or a clip or the like, can also be provided for connecting the free ends for the holding anchor.

To improve the insulation between the concrete layers, the longitudinal legs can have an intermediate area in which the material thickness is reduced. This reduction in the thickness of the material reduces the heat conduction of the retaining anchor between the concrete layers. For example, this can be achieved in that one or both longitudinal legs are provided with at least one longitudinal slot or a longitudinal opening and / or one or both longitudinal legs are provided with at least one lateral recess in the intermediate area.

This configuration of the retaining anchors is particularly advantageous if the intermediate area is arranged in the area of an insulation layer between the concrete slabs to be connected, with a reduction in the material thickness.

With regard to the design of the connecting web, the inventor proposes to either simply design it flat or to imprint a contour on the connecting web which surrounds a reinforcement wire, preferably in the diagonal direction or in the longitudinal direction, on one side.

According to another embodiment, the holding anchor can also be designed in such a way that the connecting web has one or two laterally bent tabs which have an opening for the passage of a reinforcement wire.

With regard to the material preferably used, it should be noted that, for protection against corrosion, it can be made, for example, of VA material, preferably VA material. In accordance with the basic idea of the invention, the inventor also proposes the known composite concrete slab consisting of at least a first concrete slab, a second concrete slab, an insulation layer which is arranged between the concrete slabs, the first concrete slab being a first reinforcement and the second concrete slab being one have second reinforcement, and at least one retaining anchor for connecting the concrete slabs between the first and second reinforcement is to be improved in that the at least one retaining anchor between the concrete slabs is designed in accordance with the designs shown here.

The invention is described in more detail below on the basis of the preferred exemplary embodiments with the aid of the figures. The individual shows:

Figure la-lc: embodiment of a retaining anchor in 3 views with semicircular lower recesses;

Figure 2a-2c: Another embodiment of a retaining anchor in 3 views with elongated lower recesses;

Figure 3: retaining anchors with material recess at medium height;

Figure 4: 3D view of the holder from Figures 2a-2c; Figure 5: 3D view of a retaining anchor for pushing reinforcing bars in concrete slabs on both sides;

Figure 6: 3D view of a retaining anchor with additional tabs on the connecting web; Figure 7: supervision of reinforcement with retaining anchor from figure

5 from above;

Figure 8: Side view of a composite concrete slab with reinforcement and retaining anchors;

Figure 9: Side view of a composite concrete slab with reinforcement and retaining anchors, retaining anchors with an embossed groove in the connecting web; Figure 10: top view of reinforcement with retaining anchor from Figure la-2c or 2a-2c;

Figures la-lc show a first embodiment of a retaining anchor 1 in three side views. The holding anchor consists of two elongated legs 2 and 3, which are connected to one another at one end via a connecting web 5. In the area of the connecting web, the legs 2 and 3 have cutouts 4 offset from one another. During assembly, the retaining anchor is hooked onto the cross on a wire cross of a reinforcement mat in such a way that the two wires of the cross engage in the lateral recesses and hook the retaining anchor 1 upright with the cross. The concrete layer of this reinforcement can then be poured, with the retaining anchors protruding upwards. The insulation layer is then applied, leaving an upper part of the retaining anchor free. This part of the upper end of the legs each has an opening, here a round hole, through which a wire of the reinforcement of the concrete layer still to be applied is pushed. This concrete layer is then poured out. This creates a secure, tensile connection between the two concrete layers, with good insulation being achieved through the insulation layer. It should be mentioned that the holding anchors shown are made in one piece and are formed by stamping from a sheet metal. The holding anchors should preferably have a length / width ratio of at least 5: 1 to approximately 10: 1, the length of the web being somewhat larger than the width of the legs. Basically, the size ratios result from the geometric necessity to ensure that the retaining anchor is hooked onto the wire cross of the reinforcement. The leg thickness should be selected in such a way that the necessary tensile forces can be absorbed. Too great a thickness seems undesirable, so that sufficient elasticity of the retaining anchor is guaranteed. Figures 2a-2c show a further embodiment of a retaining anchor 1, also in three side views. The difference between the retaining anchors lies in the lower recesses, which here correspond to approximately twice the wire diameter of the reinforcement used.

FIG. 3 shows an improved version of the holding anchor 1 in a side view. Here, in the area of the connecting web, two recesses 4 are provided on each side of the legs 2 and 3, for engaging the wires on the cross of a reinforcement mat, so that the direction and sequence of the wires of the cross need not be taken into account when inserting the retaining anchor ,

Furthermore, the legs of this retaining anchor have lateral material cutouts at a medium height. As a result, the material thickness in the area of the insulation layer and thus the thermal conductivity can be reduced, so that a better insulation is created between the two concrete layers to be connected.

FIG. 4 shows a 3D view of the holding anchor 1 from FIGS. 2a-2c, but a slot is made in the area of the insulation layer for each leg 2 and 3 in order to reduce the heat conduction in this area.

FIG. 5 also shows a 3D view of a retaining anchor 1, but in this embodiment there is an opening 9 in the legs 2 for pushing reinforcement bars of the two concrete slabs in addition to the openings 6 at the upper end and also at the lower end in the region of the connecting web 5 and 3 attached. Such a design is appropriate if reinforcement mats are not used, but are instead created by hand at the construction site. A wire can be placed over the connecting web 5 and the second wire arranged perpendicular to it can be pushed above through the two openings 9. Here, too, the holding anchors stand by themselves in a vertical position so that the upper end is freely accessible even after the lower concrete slab has been poured and can be connected to the next reinforcement.

However, if such a design of the retaining anchor is not to be connected to a reinforcement cross, but only to a single wire, either the opening 9 can be designed asymmetrically, for example square or oval, which, however, also requires a corresponding shape of the wire, so that the tilting of the Halt anchor is prevented. There is also the possibility of designing the holding anchor in the area of the passage of the reinforcing wire to be hooked in such a way that the wire becomes jammed with the holding device. Furthermore, a possibly separate additional clamping device can be provided, which prevents the holding anchor from tilting.

Another embodiment of the holding anchor 1 is shown in FIG. 6 in a 3D view. This illustration shows a holding anchor, which is formed in the region of the connecting web 5 with additional tabs 11. These tabs 11 can optionally result from a bevel on the connecting web or can also be connected to one or each leg 2 and / or 3. Basically, it is sufficient if a tab is provided, but such tabs can be attached on both sides. These tabs 11 in turn have an opening or a slot through which a reinforcement wire can be inserted.

In addition, it should be pointed out that in all versions of the retaining anchor 1, the legs 2 and 3 can also be rotated upward by approximately 45 ° or 90 °, so that wire can also be aligned with the reinforcement arranged above. FIG. 7 shows a top view of a reinforcement with a retaining anchor 1 according to the invention from FIG. 5. The two reinforcement wires 12 of the lower reinforcement and 14 of the upper reinforcement arranged at right angles can be seen. The wire 13 of the lower reinforcement running parallel to the reinforcement wire 14 is covered. In addition, the two legs 2 and 3 can be seen through which the reinforcement wires run. Finally, the connecting web 5 can be seen below, which runs below the wire 14.

FIG. 8 shows a side view of a composite concrete slab with reinforcement and retaining anchors corresponding to the design from FIG. 7. The retaining anchor 1 runs from the concrete layer 15 arranged below, through the insulation layer 17 and hooks into the upper concrete layer 16 in the reinforcement arranged there.

FIG. 9 shows a similar side view of a composite concrete slab with reinforcement and retaining anchor 1 as in FIG. 8. Here, however, the retaining anchor 1 is provided in the area of the connecting web 5 with an embossed groove 18 through which the lower wire 12 of the reinforcement of the lower concrete layer 15 runs ,

Finally, FIG. 10 shows a top view of a reinforcement with a retaining anchor 1 from FIGS. 1a-2c or 2a-2c. Since this configuration of the retaining anchor leads to an angular offset of the course of the reinforcement bars of the upper and lower concrete layer, it can be particularly advantageous here to install a cross-over of the legs 2 and 3 of the retaining anchor 1 by approximately 45 °, so that subsequently a parallel alignment of the Reinforcing wires is possible.

In addition, it should be pointed out that the above-mentioned angle specifications are the usual when reinforcing

Show tolerances without leaving the scope of the invention. It is also understood that the above mentioned features of the invention can be used not only in the respectively specified combination, but also in other combinations or alone, without leaving the scope of the invention. A kinematic reversal of the illustrated embodiments is also within the scope of the illustrated invention.

Reference character list

1 holding anchor

2 first legs

3 second legs

4 recess

5 connecting bridge

6 opening

7 Material cut-out

8 slot

9 opening

10 opening

11 tab

12 First reinforcement wire

13 Second reinforcement wire

14 Third reinforcement wire

15 First layer of concrete

16 Second layer of concrete

17 insulation layer

18 groove

Claims

claims

1. holding anchor (1) for connecting a first reinforced concrete slab (15), preferably an outer concrete slab, and a second reinforced concrete slab (16), preferably an inner concrete slab, an insulation layer (17) being arranged between the concrete slabs, characterized in that the Retaining anchor (1) consists of flat steel and this is hooked into the reinforcements (12, 13, 14).

2. retaining anchor according to the preceding claim 1, characterized in that the flat steel is formed similar to an elongated U-shape, consisting of two longitudinal legs (2, 3) and a connecting web (5).

3. retaining anchor according to one of the preceding claims 1 to 2, characterized in that the longitudinal legs (2, 3) in the region of the connecting web (5) have lateral recesses (4).

4. retaining anchor according to the preceding claim 3, characterized in that the lateral recesses (4) have a height which corresponds to the height of the wire cross of a reinforcement mat into which the retaining anchor (1) is to be hooked.

5. retaining anchor according to the preceding claim 3, characterized in that each leg (2, 3) in

Area of the connecting web (5) has a recess (4) on each side, which can each comprise a wire (12, 13) of a reinforcement mat, the recesses, corresponding to the arrangement of the wires (12, 13) in a cross of a reinforcement mat, are arranged offset in height.

6. retaining anchor according to the preceding claim 5, characterized in that each leg (2, 3) in the region of the connecting web (5) has an additional recess (4) on each side, each comprising a wire (12, 13) of a reinforcement mat can, so that each side of the longitudinal leg (2, 3) of the holding anchor (1) in the region of the connecting web (5) has two recesses (4).

7. retaining anchor according to one of the preceding claims 5 to 6, characterized in that at least one of the lateral recesses (4), preferably all lateral recesses, is semicircular.

8. retaining anchor according to one of the preceding claims 5 to 7, characterized in that at least one of the lateral recesses (4), preferably all lateral recesses, is rectangular, preferably with rounded corners.

9. holding anchor according to one of the preceding claims 5 to 8, characterized in that at least one of the lateral recesses (4), preferably all lateral recesses, is triangular, preferably with rounded corners.

10. retaining anchor according to one of the preceding claims 1 to 2, characterized in that the longitudinal legs (2, 3) in the region of the connecting web (5) have opposite openings (9) through which the wire (12, 13) a reinforcement can be performed.

11. Retaining anchor according to one of the preceding patent claims - before 1 to 10, characterized in that the longitudinal legs (2, 3) have an embodiment at their free end have, which allows hooking with a reinforcement arranged at this end.

12. retaining anchor according to the preceding claim 11, characterized in that each longitudinal leg (2, 3) has at its free end an opening (6) through which a reinforcing iron (14) can be inserted.

13. retaining anchor according to the preceding claim 11, characterized in that the free ends of the

The longitudinal legs (2, 3) have a shape, as a result of which these ends can be connected, preferably clipped, together.

14. Anchor according to one of the preceding claims 11 to 13, characterized in that a separate connecting element, preferably a screw or a clip, is provided for connecting the free ends.

15. retaining anchor according to one of the preceding claims 1 to 14, characterized in that the longitudinal legs (2, 3) have an intermediate region in which the material thickness is reduced.

16. retaining anchor according to the preceding claim 15, characterized in that to reduce the material thickness, one or both longitudinal legs (2, 3) are provided with at least one longitudinal slot (8) or a longitudinal opening.

17. Retaining anchor according to one of the preceding claims 15 to 16, characterized in that one or both longitudinal legs (2, 3) are provided with at least one lateral recess (7) in the intermediate region to reduce the material thickness.

18. Retaining anchor according to one of the preceding claims 15 to 17, characterized in that the intermediate area is arranged with a reduction in the material thickness in the area of an insulation layer (17) between the concrete slabs (15, 16) to be connected.

19. Holding anchor according to one of the preceding claims 1 to 18, characterized in that the connecting web (5) has a contour (18) which surrounds a reinforcement wire (12), preferably in the diagonal direction or longitudinal direction, on one side.

20. holding anchor according to one of the preceding claims 1 to 18, characterized in that the connecting web (5) has one or two laterally bent tabs (11) which have an opening (10) for passing a reinforcing wire (12).

21. Anchor according to one of the preceding claims - before 1 to 18, characterized in that the production is carried out by punching operations from flat iron or sheet metal.

22. Retaining anchor according to one of the preceding patent claims - before 1 to 18, characterized in that it consists of VA material, preferably V ₄ A material.

23. Composite concrete slab consisting of at least: 23.1. a first concrete slab (15), 23.2. a second concrete slab (16),

23.3. a dam layer (17), which is arranged between the concrete slabs (15, 16), wherein

23.4. the first concrete slab (15) has a first reinforcement (12, 13) and the second concrete slab (16) has a second reinforcement (14), wherein

23.5. at least one retaining anchor (1) for connecting the concrete slabs (15, 16) is attached between the first and second reinforcement (12, 13; 14), characterized in that

23.6. the at least one retaining anchor (1) is provided between the concrete slabs (15, 16) and has the features of the retaining anchors (1) according to one of the claims 1 to 22.