DE29806817U1 - Concrete anchor - Google Patents

Description

fischerwerke Artur Fischer GmbH & Co. KG 8 April 1998

72176 Waldachtal

M 1907 S/vo

Description Concrete anchor

The invention relates to a concrete anchor with the features of the preamble of claim 1.

Concrete anchors of this kind are known and are usually in the form of sleeves and made of metal. For anchoring, the known concrete anchors are attached, for example, to the inside of a formwork, into which concrete is then poured, which surrounds the concrete anchor and anchors it after it has set. Another option is to press the concrete anchor into the not yet (fully) hardened concrete after the concrete has been poured. As a device for attaching an object to the concrete, the known concrete anchors have an internal thread. The known concrete anchors have good thermal conductivity and therefore represent a heat or cold bridge; they do not comply with the applicable thermal insulation regulations.
25

The invention is based on the object of designing a concrete anchor of the type mentioned above in such a way that it has a good thermal insulation effect.

This object is achieved according to the invention in that the concrete anchor is made of a material with low thermal conductivity. The material for the

For example, plastics, especially polyamide, can be used for the concrete anchor according to the invention. To increase strength, the concrete anchor can have a fiber-reinforced plastic. The concrete anchor according to the invention has the advantage of low thermal conductivity; it insulates against both heat and cold. The mechanical load-bearing capacity, in particular the anchoring force, is comparable to that of a concrete anchor made of metal. In particular, the applicable thermal insulation regulations can be met with the concrete anchor according to the invention.

In a preferred embodiment of the invention, an anchor body of the concrete anchor expands in the direction of a front end of the concrete anchor. The anchor body therefore has, for example, an expanding cone or pyramid shape. Due to its expansion in the direction of its front end, the concrete anchor has an undercut, it is anchored in the concrete in a form-fitting manner and therefore has a high anchoring force. The anchoring force is limited here in particular by the strength of the concrete and not by the strength of the concrete anchor.

In one embodiment of the invention, the concrete anchor has one or preferably several undercuts formed by beads, ribs, barb elements or the like. The concrete anchor can, for example, have a fir tree profile to form the barb elements. The undercut creates a positive connection in the concrete to prevent the concrete anchor from being pulled out.
25

In a preferred embodiment of the invention, the concrete anchor has an anti-rotation device. This anti-rotation device can be provided by beads, ribs or the like. The concrete anchor can also be non-circular, for example oval, elliptical or polygonal, over its entire length or part of its length to prevent rotation.

In one embodiment of the invention, the concrete anchor has a setting collar, with which it is inserted into the concrete so that it is flush with the concrete surface. In particular, when pressing the concrete anchor into not yet

When the concrete has hardened, the setting collar limits the anchoring depth of the concrete anchor to a specified level.

In one embodiment of the invention, the anchor body tapers at its front end, whereby it can be pressed into concrete that has not yet set with little force.

The device for fastening an object can, for example, be an internal or external thread or a hook or an eyelet of the concrete anchor. In the case of an internal thread, the concrete anchor is designed in particular as a sleeve. If an external thread is provided, this can protrude from the concrete in the same way as a hook or an eyelet.

The invention is explained in more detail below using an embodiment shown in the drawing. They show:

Figure 1 shows a concrete anchor according to the invention; in axial section;

Figure 2 shows the concrete anchor from Figure 1 in perspective view 20

Figure 3 shows the concrete anchor from Figure 1 anchored in concrete.

The concrete anchor 10 according to the invention shown in Figures 1 and 2 is made as an injection-molded part made of polyamide. It has a sleeve-shaped anchor body 12 which widens conically with an acute cone angle α in the direction of a front end 14 of the concrete anchor 10. Half the cone angle α/2 is shown in Figure 1.

The front end 14 tapers to a point in a conical shape, with the conical shape being flattened at two opposite points on the circumference to form wedge surfaces 16 (Figure 2).

At a rear end, a ring-disk-shaped setting collar 18 is formed which is integral with the anchor body 12 and projects radially.

Anchor body 12 is a hollow body with a coaxial blind hole 20, which is provided with an internal thread 22 as a device for fastening an object.

On its outer surface, the anchor body 12 has grooves 24 running in the circumferential direction, extending over slightly less than half the circumference.

To be inserted into concrete, the concrete anchor 10 according to the invention is attached with its setting collar 18 to a formwork panel (not shown in the drawing) adjacent to the formwork panel. To do this, a screw is inserted through a hole in the formwork panel and screwed into the internal thread 22 of the concrete anchor 10 and tightened. Concrete 26 is then poured into the formwork, which completely surrounds the anchor body 12 including its front end 14, as shown in Figure 3. A rear end face of the setting collar is flush with a surface of the concrete 26, the blind hole 20 with the internal thread 22 is freely accessible after the formwork has been removed. An object to be fastened, for example a bracket, a fragment of which is shown in section in Figure 3, can be screwed to the concrete anchor 10 using a screw 28 and thus anchored to the concrete 26.

Another possibility for inserting the concrete anchor 10 into the concrete 26 is to press the concrete anchor into a surface of the concrete 26 that is accessible when pouring the concrete 26, after the concrete 26 has been poured but has not yet (fully) hardened. The tapered front end 14 makes it easier to press the concrete anchor 10 into the concrete 26. The setting collar limits the setting depth of the setting anchor 10 and in particular prevents the concrete anchor 10 from sinking into the still liquid concrete 26.

The wedge surfaces 16 and front flanks 32 of the interrupted grooves 24 form anti-rotation devices that hold the concrete anchor 10 securely in the concrete 26. The anchor body 12, which widens conically in the direction of the front end 14, and the grooves 24 running in the circumferential direction form undercuts 34 that anchor the concrete anchor 10 in a form-fitting manner in the concrete 26.

Claims (8)

fischerwerke Artur Fischer GmbH & Co. KG 8 April 1998 72176 Waldachtal M 1907 S/vo Protection claims 1. Concrete anchor with an anchor body which is intended for introduction into concrete, and with a device for fastening an object to be fastened to the concrete, characterized in that the concrete anchor (10) consists of a material with low thermal conductivity. 2. Concrete anchor according to claim 1, characterized in that the concrete anchor (10) consists of a plastic. 3. Concrete anchor according to claim 1, characterized in that the anchor body (12) widens in the direction of a front end (14) of the concrete anchor (12). 4. Concrete anchor according to claim 1, characterized in that the concrete anchor (10) has an undercut (34) acting against pulling out of the concrete (26). 5. Concrete anchor according to claim 1, characterized in that the concrete anchor (10) has an anti-rotation device (16, 32). 6. Concrete anchor according to claim 1, characterized in that the concrete anchor (10) has a setting collar (18). 7. Concrete anchor according to claim 1, characterized in that the anchor body (12) has a front, tapered end (14). 8. Concrete anchor according to claim 1, characterized in that the device for fastening an object (30) has a thread (22).