DE9210992U1 - Dowel arrangement for industrial floors made of concrete - Google Patents

Description

Dowel arrangement for industrial floors made of concrete

Description

The invention relates to a dowel arrangement according to the preamble of claim 1.

In large-scale industrial floors made of concrete, it is known that dummy joints are subsequently installed, which serve as predetermined breaking points when forced stresses occur due to shrinkage or other causes. Vertical displacements can sometimes be observed at the edges of the joint, which can lead to malfunctions for vehicles such as forklifts and/or damage to the joint flanks. The following are the main causes of this type of phenomenon:

insufficient crack interlocking due to excessively large joint openings (large joint areas, package tearing),

insufficiently stable substructure (pumping effect) and

Bowling due to uneven shrinkage.

The countermeasures known to date, which mainly consist of inserting metal rods running across the dummy joint in the area of the dummy joint, are not yet satisfactory. In addition, inserting a large number of individual metal rods is extremely time-consuming, especially since in addition to the metal rods, support elements, such as basket-like plastic supports, are also required to support the

Met a LL bars to be arranged at the desired height and as far as possible to secure them against displacement.

This is where the invention aims to remedy the situation. Its task is therefore to provide a dowel arrangement in an improved design that is suitable for eliminating or at least significantly reducing the problems described above.

Starting from a dowel arrangement of the type described at the outset, the stated object is achieved according to the invention in that a number of metal rods (cross rods) are each firmly connected approximately centrally to a support rod running transversely to them and in that both ends of individual cross rods are bent at an angle, preferably at a right angle.

The new dowel arrangement not only offers advantages in terms of preventing vertical deformation at the joint edges, but also for the manufacture of industrial floors made of concrete. The firm connection of crossbars to a support bar enables a controlled layer arrangement during floor manufacture, whereby shifts such as those that occur when using individual crossbars cannot occur. In the hardened concrete, the crossbars take over the shear force transmission and at the same time prevent a height offset at the joint edges. The crossbars with the bent ends fulfill a dual function. On the one hand, they serve to secure the height in the concrete and, on the other hand, they act as anchors that are intended to prevent the package from tearing by means of a controlled force transfer.

The cross bars are preferably bars with a smooth surface that have only a low level of adhesion to the concrete, whereby the anchoring is achieved by the bends alone from a certain joint opening. By selecting the bar spacing and the number of bends, they can be adapted to the expected stresses from the outset.

Advantageous further developments of the new dowel arrangement are described in the subclaims. It is therefore expedient to attach plastic feet to the bent ends of the cross bars. By using plastic feet at different heights, it is easy to ensure that a dowel arrangement is installed in the middle of the thickness of the concrete slab.

The cross bars are conveniently connected to the support bar by welding. The pitch of the cross bars can be varied; they are preferably arranged with the same pitch from one another in order to achieve an even distribution of force. A flat iron is conveniently used as the support bar.

An embodiment of a dowel arrangement according to the invention is shown schematically in the drawing and is explained in more detail below. It shows:

Fig. 1 is a perspective view of a dowel arrangement,

Fig. 2 a side view of an angled end

a crossbar with a plastic foot attached to it on a larger scale,

Fig. 3 a vertical longitudinal section of a concrete floor in the plane of the support bar of an embedded dowel arrangement and

Fig. 4 shows a cross-section in the area of a dummy joint in the plane of line I-I of Fig. 3.

The dowel arrangement consists of a support bar (1) made of flat iron and considerably shorter cross bars (2) made of round wire welded to it. The latter are arranged with the same pitch from one another, the absolute size of which can be selected according to the respective application requirements. The fastening of the cross bars (2) approximately in their middle to the support bar (1) is advantageously carried out by welding.

Some crossbars (2), namely the crossbars (2.1), are bent at right angles at their ends, forming end pieces (3) that protrude downwards in relation to the later installation position. In the exemplary embodiment, in addition to the two end crossbars (2.1), an approximately central crossbar (2.1) is provided with bent end pieces (3). The respective number of crossbars (2.1) with bent end pieces (3) is selected according to the expected stresses. The length of the crossbars (2.1) in the initial state, i.e. before the ends are bent, can be the same as that of the crossbars (2) or longer.

A

preferably a cylindrical plastic foot (4) is attached, which has a circular plate (5) as the lower end. The plastic foot (4) can be designed differently with regard to the depth of the insertion opening (6), so that the entire dowel arrangement can be set up at different heights on the floor depending on the selected support height. The use of different plastic feet has the advantage that one and the same dowel arrangement can be used for concrete floors with different thicknesses. As a result, this results in savings in production and storage.

Fig. 3 shows a sectional view of a dowel arrangement (8) embedded in a concrete slab (7). In the cross-sectional view of Fig. 4, the central position of the dowel arrangement (8) in relation to a dummy joint (9) can be seen. The support rod (1) runs below the dummy joint (9) approximately in the middle of it.

In a practical dowel arrangement,

the length of the support bar is about 3000 mm, and it consists

made of flat iron 20 x 5 mm. The cross bars have a length

of approx. 540 mm and are made of 6 mm round steel.

Claims (5)

Expectations 1. Dowel arrangement which can be embedded below a dummy joint in large-area, non-reinforced or reinforced concrete slabs, possibly containing steel fibers, in particular for industrial floors, and which has metal rods which run transversely to the dummy joint and are arranged at a distance from one another and which extend approximately in the area of the average thickness of the concrete slab on both sides into the slab sections formed by the dummy joint, characterized in that a number of metal rods (cross rods 2 and 2.1) are each firmly connected approximately in the middle to a support rod (1) running transversely to them and that both ends (3) of individual cross rods (2.1) are bent at an angle, preferably at a right angle. 2. Dowel arrangement according to claim 1, characterized in that a plug-on plastic foot (4) is attached to the bent ends (3) of the cross bars (2.1). 3. Dowel arrangement according to claim 1 or 2, characterized in that the cross bars (2 and 2.1) are connected to the support bar (1) by welding. 4. Dowel arrangement according to one of claims 1 to 3, characterized in that the support rod (1) is made of flat or round iron. 5. Dowel arrangement according to one of claims 1 to 4, characterized in that the cross bars (2 and 2.1) are arranged at approximately the same pitch from one another on the support bar (1).