DE20103213U1 - Component for influencing the formation of cracks in rising concrete walls - Google Patents

Description

Component for influencing crack formation in rising concrete walls

The invention relates to a component for influencing the formation of cracks in rising concrete walls of buildings, wherein the component is molded into the concrete material of the wall with sufficient cover.

It is known to construct buildings from concrete, for example by pouring a concrete base and pouring concrete walls onto this base, particularly in the outer wall area. When the wall concrete hardens, longitudinal stresses arise due to the flow of hydration heat and deformation hindrance on the pre-concreted building slab (base) with connecting reinforcement. This leads to uncontrolled vertical cracks. It is possible to prevent such cracking by using appropriate

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to prevent strong reinforcement of the wall, but such reinforcements are very costly due to the considerable use of materials and the required installation time.

For this reason, it has already been planned to provide joints in the walls through which crack formation can be controlled and which can result in considerable savings in reinforcement. Such joints can be designed as dummy joints, controlled crack joints or construction joints.

In order to ensure that the area of the joint is impermeable to water, particularly in the case of external walls, appropriate sealing must be carried out. This is often achieved by using external joint tape in the area of the joint. It is also known to arrange a basket made of expanded metal in a vertical direction in the area of the 2:u-forming crack joint to form predetermined crack joints. The basket can, for example, be square in cross-section. In such an arrangement, the additional

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Arrangement of an external joint tape is required. In addition, with such a design, the crack control of the predetermined crack is not always guaranteed.

Additional problems arise in the area where the wall connects to the base, where the base has a corresponding joint tape or joint sheet that is concreted into the base of the wall. In this area, a suitable connection of the basket made of ribbed expanded metal to the joint tape and appropriate sealing is required.

Based on this prior art, the invention is based on the object of creating a component of the generic type which causes a cross-sectional weakening of the wall in order to specifically control a predetermined crack, with which the crack joint can be sealed and which is suitable for absorbing changes in the length of the concrete wall without tearing out of the concrete material.

To solve this problem, it is proposed that the component is a hollow profile made of black sheet metal with a square cross-section, the diagonals of which are directed transversely to the wall and parallel to the longitudinal extension of the wall and which is concreted into the wall parallel to the vertical extension of the wall, with straight webs protruding from the corners of the hollow profile, which are penetrated by the diagonal that runs parallel to the longitudinal extension of the wall, in the direction of the diagonal, the ends of which are angled and run transversely to the longitudinal extension of the wall.

The corresponding hollow profile is arranged in a suitable manner between the formwork for the concrete wall and held in the correct position using suitable devices so that it cannot move or slip during the concreting process. The hollow profile weakens the cross-section in the area of the intended crack to be created, whereby the cross-sectional area should be approximately 1/3 of the wall thickness. Since the hollow profile is made of unperforated sheet metal, it can also serve as a seal for the crack joint. By forming the

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Hollow profiles also have the possibility of being deformed, whereby the webs with the angled ends prevent the hollow profile from tearing out of the concrete material. The angled ends serve to hold the profile sufficiently in the concrete material, so that there is no risk of it tearing out of the concrete material.

A particularly preferred further development is that the hollow profile including webs and bends consists of two half-shells, with the dividing line of the half-shells running along the diagonals, between the adjoining double-layer webs and bends.

This design ensures that when the wall moves at right angles to the component, i.e. in the longitudinal direction of the wall, the hollow profile, which has a square cross-section, can follow the movements due to the loosely assembled shape and cannot tear out due to the molded-on bends.

Preferably, it is further provided that the component on

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a concrete base with a joint tape protruding from the concrete base is placed on top, whereby the outer half-shell is longitudinally displaced relative to the inner half-shell, so that the outer half-shell together with its webs and bends is arranged next to the joint tape and is supported with its front edge on the base and the inner half-shell rests with its front edge on the front edge of the joint tape.

The component is placed in the target plate over the joint tape or joint sheet that is placed in the middle of the wall axis, whereby the lateral bends ensure that the distance between the axis of the joint tape and the axis of the component is appropriately dimensioned, for example at least 2.5 cm. This achieves a perfect concrete coating, whereby the concrete material usually has a grain size of 0.16 mm.

Preferred developments are specified in claims to 7. An embodiment of the invention is shown in the drawing and described in more detail below. It shows:

Figure 1 shows the application of an inventive

Component schematically in view;

Figure 2 shows a section through the wall according to

Figure 1;

Figure 3 the component according to the invention in

Cross section seen.

The drawing shows a component 1 for influencing the formation of cracks in rising concrete walls 2 of buildings. The component 1 is molded into the concrete material of the wall 2 with sufficient cover as intended. This is illustrated, for example, in Figure 2.

The component 1 is a hollow profile made of black sheet metal with a square cross-section, the diagonals of which are directed transversely to the wall 2 on the one hand and parallel to the longitudinal extension of the wall 2 on the other hand, and which is concreted into the wall 2 parallel to the vertical extension of the wall, as can be seen for example from

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of Figure 1. From the corners of the hollow profile, which are penetrated by the diagonal that runs parallel to the longitudinal extension of the wall, straight webs 3 protrude in the direction of the diagonal, the ends of which are angled (angles 4) and run transversely to the longitudinal extension of the wall 2.

The hollow profile, including webs 3 and bends 4, consists of two half-shells 5,6, whereby the dividing line of the half-shells 5,6 runs along the diagonal between the adjoining double-layer webs 3 and bends 4. The ends of the double-layer bends 4 are hooked together, as can be seen in particular from Figure 3, so that the half-shells 5,6 are joined together in a captive manner, but are held together so that they can be moved in the longitudinal direction. In the installation situation, the component 1 is placed on a concrete base 7 with the joint tape or joint sheet 8 protruding from the concrete base 7, whereby the outer half-shell 6 is longitudinally displaced relative to the inner half-shell 5, so that the outer half-shell 6 with its webs 3 and bends 4 is arranged next to the joint tape 8 and is aligned with the front edge

it

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on the sole 7, while the inner half-shell 5 rests with its front edge on the front edge of the
Joint tape 3 rests on it.

The dimensions of the hollow profile are in diagonal
direction preferably about 14 cm, while the length of the webs 3 is about 5 cm and the length of the
bends,, across the diagonal direction is about 2.5 cm. This corresponds to a dimensioning in which the
Grain size of the concrete material is approx. 0.16 mm.

The design according to the invention enables a
Excellent crack formation with significant savings
of reinforcement material, whereby a sealing
the crack joint is reached and movement is accommodated
due to the deformation possibility of the component
is achieved without the component tearing out of the surrounding concrete material.

The invention^ is not limited to the embodiment
limited, but variable in many ways within the framework of revelation.

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All new individual and combination features disclosed in the description and/or drawing are considered essential to the invention.

Claims (7)

1. Component ( 1 ) for influencing the formation of cracks in rising concrete walls ( 2 ) of buildings, wherein the component ( 1 ) is molded into the concrete material of the wall ( 2 ) with sufficient cover, characterized in that the component ( 1 ) is a hollow profile made of black sheet metal with a square cross section, the diagonals of which are directed transversely to the wall and parallel to the longitudinal extension of the wall ( 2 ) and which is concreted into the wall ( 2 ) parallel to the vertical extension of the wall ( 2 ), wherein from the corners of the hollow profile, which are penetrated by the diagonal that runs parallel to the longitudinal extension of the wall ( 2 ), straight webs ( 3 ) protrude in the direction of the diagonals, the ends of which are angled and run transversely to the longitudinal extension of the wall ( 2 ). 2. Component according to claim 1, characterized in that the hollow profile including webs ( 3 ) and bends ( 4 ) consists of two half-shells ( 5 , 6 ), wherein the dividing line of the half-shells ( 5 , 6 ) runs along the diagonal, between the adjoining double-layer webs ( 3 ) and bends ( 4 ). 3. Component according to claim 2, characterized in that the ends of the double-layered bends ( 4 ) are hooked together so that the half-shells ( 5 , 6 ) are held together captive but displaceable in the longitudinal direction of the hollow profile. 4. Component according to one of claims 1 to 3, characterized in that the component ( 1 ) is placed on a concrete base ( 7 ) with a joint tape ( 8 ) protruding from the concrete base ( 7 ), the outer half-shell ( 6 ) being longitudinally displaced relative to the inner half-shell ( 5 ), so that the outer half-shell ( 6 ) together with its webs ( 3 ) and bends ( 4 ) is arranged next to the joint tape ( 8 ) and is supported with the front edge on the base ( 7 ) and the inner half-shell ( 5 ) rests with its front edge on the front edge of the joint tape ( 8 ). 5. Component according to one of claims 1 to 4, characterized in that the dimension of the hollow profile in the diagonal direction is approximately 14 cm. 6. Component according to one of claims 1 to 5, characterized in that the length of the webs ( 3 ) in the diagonal direction is approximately 5 cm. 7. Component according to one of claims 1 to 6, characterized in that the length of the bends ( 4 ) transverse to the diagonal direction is approximately 2.5 cm.