EP1902186B1 - Connecting device - Google Patents

Abstract

The connector has an oblong box (2) for insertion into a face of the construction units, a floor (5) and at least two longitudinal side panels (6) and at least one flexible armoring loop element (3) movably accommodated in the oblong box. The floor is profiled with groups of floor projections and recesses (7 ') alternating in the longitudinal direction, whereby each group has at least one projection and/or at least one recess.

Description

Technical area

The invention relates to a connecting device according to the preamble of claim 1.

State of the art

In order to build supporting structures of a building made of precast concrete parts, the precast concrete parts must be connected to each other with a force fit. Disc-shaped wall elements are connected to each other or to vertical columns on vertical joints. At the end faces of the elements corresponding Vergussnuten are arranged on the basis of connecting elements are arranged with storage boxes containing fold-out reinforcing elements. These reinforcing elements may for example consist of reinforcing steel. Such a so-called Rückbiegeanschluss is for example in the DE 39 37 275 A1 discloses, however, has the disadvantage that the rebending of the reinforcing bars is cumbersome and power-consuming and requires robust storage boxes with large dimensions.

In another concept, the reinforcing elements can also be designed as flexible rope elements. Such storage boxes are for example in the WO 03/008737 , of the EP 0 914 531 A1 or the EP 0 534 475 A1 disclosed. By folding out these flexible rope elements are perpendicular to the front side loop-like elements available that overlap when assembling the precast elements in the joint. The loops that overlap in the joint are usually grouted over the entire height of the precast elements in the grouting joint with joint mortar. After its hardening, the grouting joint can transfer forces in different directions thanks to the overlapping connecting elements, ie tensile forces in the overlap perpendicular to the joint, ie perpendicular to the end face of the precast elements, transverse forces perpendicular to the plane of the pane and, most importantly, transverse force parallel to the joint longitudinal direction. The latter represents a construction practice very frequently occurring load case.

In contrast to the above-discussed custody boxes with rigid reinforcing elements (reinforcing bars), however, the flexible cable elements contribute only indirectly to the transverse force transmission, since they counteract widening of the joint, but due to their flexibility can build only small force components in the lateral direction of force.

Presentation of the invention

It is therefore an object of the present invention to provide a connecting device of the type mentioned above with at least one flexible reinforcing loop element, which has an improved transverse force carrying behavior in a simple construction.

This object is achieved according to the present invention by a connecting device having the features of claim 1. Advantageous developments of the invention are specified in the dependent claims.

The invention is based on the idea, the transverse force carrying behavior by an optimized toothing between the storage box of the connecting device and the to improve surrounding concrete and to reduce the stress of the wall component on the side of the storage box. For this purpose, it is provided according to the invention that the bottom of the storage box has a bottom profiling with longitudinally alternating sets of bottom projections and bottom recesses starting from the bottom, each group having at least one bottom projection or at least one bottom recess.

The alternating arrangement of the bottom projections and bottom recesses results in a high overall toothing between the trolley bottom and concrete, which can be achieved with comparatively low production costs, in particular comparatively low degrees of deformation when forming the bottom projections and bottom recesses. The high overall toothing results in that transverse force stresses can be introduced into the respective concrete component in a low-slip manner via the floor box, so that the power transmission can be activated via the connection device before a pronounced crack formation occurs in the concrete. Furthermore, the transverse force is introduced via the floor box at a point in the concrete component, where this is no longer weakened by the joint. In this way, a frequently critical breakage of the component edges in the region of the joint is minimized.

Last but not least, the formation of the deposit box floor also has a favorable effect on the transmission of power within the joint itself, ie between the grouting mortar, the flexible reinforcing loop elements and the Verwalirkasten. In this area, the bearing behavior can be imagined by a framework model with tension and compression struts (although the present invention is not limited by this model conception). In attack of joint-parallel shear forces and their transmission through the Vergussfuge arise obliquely from the trestle shelves and side walls outgoing struts, which are located opposite each other Support deposit box. This support of the relevant for the bearing behavior, inclined struts pressure is significantly improved by the design of the deposit box floor with alternating projections and depressions. At the same time, the flexible reinforcing loop elements ensure that the driving force generated by the inclined struts, which tends to widen the joint, is taken up and passed on.

As has been shown in extensive tests and analyzes, the result is an optimum combination of total gearing or transverse force carrying behavior and ease of manufacture, if according to a development of the present invention, the bottom projections and the bottom recesses each have a maximum height, wherein the sum of the height of soil recesses or Bottom projections of adjacent groups define a total gear depth which is in the range of 3 to 9 mm, preferably 5.5 to 6.5 mm. It is particularly preferred that the bottom protrusions and bottom recesses have substantially the same height, i. For example, with a total toothing depth of 6 mm, each a height of 3 mm. This results in the production of Verwahrkastens a particularly low and uniform degree of deformation of the bottom projections or depressions, while at the same time sets a uniform load on both the inside and on the outside of the tavern floor. As will be discussed in more detail below, this effect is the more marked the smaller the distance between the bottom projections and depressions.

According to a further aspect of the present invention, it is provided that the side walls of the storage box each have a wall profiling with longitudinally alternating groups of wall projections and wall recesses, each group having at least one wall projection or at least one wall recess.

In this way, the overall toothing between the Verwahrkastens with the grout in the joint on the one hand and the concrete of the component on the other hand be further improved, resulting in particular in a transverse force stress in the longitudinal direction of the elongated storage box an improved structural behavior.

In the experiments and analyzes already mentioned above, the inventors have found that a particularly advantageous combination between lateral force carrying capacity and ease of manufacture of the connecting device results when the wall projections and wall recesses each have a maximum height according to a development of the present invention, the sum of Height of wall recesses or wall projections of adjacent groups defines a Gesamtverzahnungstiefe which is in the range of 2 to 6 mm, preferably 3.5 to 4.5 mm. At the same time, with regard to the wall projections and recesses, it is particularly preferred that they have substantially the same height, i. For example, with a total tooth depth of 4 mm, each a height of 2 mm, with the advantages discussed above.

The configuration of the bottom profiling and the wall profiling is, except that it is arranged alternately, not particularly limited in the context of the present invention. However, it has been found to be advantageous for the structural behavior and the manufacturability, if the bottom profiling and / or the wall profiling is wave-shaped or sawtooth-like. Likewise, further forms of soil profiling or wall profiling are particularly preferred, which will be explained in more detail below with reference to the figures.

In principle, the bottom projections or the bottom recesses in the context of the present invention can also contribute to tensile forces in the respective concrete component initiate. However, it has proved to be advantageous to assign the transmission of tensile forces primarily to the flexible reinforcing loop elements, since these have a significantly greater anchoring depth in the respective concrete component, so that they allow a tensile force introduction with high load capacity and low deformation. Against this background, it is provided according to a development of the present invention that the bottom projections and / or the bottom recesses are trapezoidal and have flanks, which are aligned substantially perpendicular to the ground. In this way, the bottom projections and the bottom recess contribute optimally to the transverse force transmission, but leave the tensile force transmission (perpendicular to the joint) largely to the flexible reinforcing loop elements.

The same considerations apply analogously to the wall projections or wall recesses, which according to an embodiment of the present invention have a lower anchoring resistance in concrete in a direction perpendicular to the ground and thus to the joint than in a direction deviating therefrom. This embodiment, in addition to the already discussed advantages in the load transfer into the concrete and an improved structural behavior in the mortar grouted joint caused. Thus, in the above discussed framework model with an obliquely engaging strut whose component perpendicular to the joint causes little or no additional forces on the side walls of the custody box and thus the component flanks in the joint area, but anchors primarily on the box bottom. At the same time, the transverse force components acting parallel to the joint can continue to be effectively anchored to the side walls of the storage box, which promotes power transmission in that direction.

Within the scope of this concept, it has proved to be advantageous for the wall projections and the wall recesses to have an elongated shape which extends substantially perpendicular to the floor. The narrow side of this elongated shape allows the desired, lower anchoring resistance perpendicular to the ground, while the long side of the elongated shape provides the transverse force components acting parallel to the joint a favorable support surface. It is particularly preferred that the elongated shape of the wall projections and wall recesses tapers in the direction away from the bottom, so that there is a correspondingly low anchoring resistance in the direction away from the bottom.

The groups of bottom projections and bottom recesses alternating in the longitudinal direction of the oblong storage box may, within the scope of the present invention (also within a single connecting device), have different distances from one another. According to a preferred embodiment of the present invention, however, it is provided that the bottom projections and the bottom recesses or wall projections and the wall recesses of adjacent groups are separated by a narrow intermediate surface or merge directly into one another. The narrower the respective intermediate surfaces are, the better the adjacent groups of projections and depressions complement each other to a large overall toothing depth with correspondingly advantageous transverse force carrying behavior.

According to a further aspect of the present invention it is provided that the storage box is designed such that two opposite storage boxes of interconnected concrete components form the smallest possible Vergussfuge that can accommodate the respective flexible reinforcement loop elements in the unfolded state including a tolerance field just. As a result, a small joint volume and thus a reduced need for high quality and expensive grout is achieved when connecting the concrete components. In addition, affects this configuration also favorable to the transverse force bearing behavior.

Brief description of the drawings

Fig. 1a

schematically shows a perspective view of a first embodiment of a connecting device according to the present invention;

Fig. 1b

schematically shows a perspective view of a storage box of a connecting device of a second embodiment of the present invention;

Fig. 1c

schematically shows a perspective view of a storage box of a connecting device of further embodiments of the present invention;

Fig. 2a

schematically shows a sectional view of a storage box of a connecting device according to further embodiments of the present invention. Invention;

Fig. 2b

schematically shows various exemplary sectional views taken along the line AA in Fig. 2a ;

Fig. 3

shows schematically a perspective view of a component connection using the connecting device according to the invention;

Fig. 4

schematically shows a partial plan view of the in Fig. 3 shown component connection.

Detailed description of preferred embodiments

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Fig. 1a schematically shows a perspective view of a connecting device 1 as a first embodiment of the present invention. The connecting device 1 serves for the transverse force-locking connection of concrete components, in particular precast concrete components, which are described below with reference to FIG Fig. 3 and 4 to be described in more detail.

The connecting device 1 comprises an elongate storage box 2, which is made, for example, of sheet metal and intended to be concreted into an end face of concrete components. The storage box 2 has a bottom 5 and two extending in the longitudinal direction of the bottom side walls 6. The bottom has through holes, through each of which a flexible reinforcing loop member 3 extends such that the loop portion comes to rest in the region of the side walls 6, while the opposite side is provided in each case a compression sleeve 3 ', which connects the free ends of the reinforcement loop element 3 together and contributes to an improved anchoring in concrete. The flexible reinforcing loop element may, for example, be a rope formed of wires or wire strands, the reinforcing loop element being receivable between and deflectable out of the side walls 6 due to its flexibility in the storage box. It shows Fig. 1a the deflected state of the flexible reinforcement loop elements. 3

The bottom 5 of the storage box 2 has a profiling in the form of bottom projections 7 and bottom recesses 7 ', which in Longitudinal direction of the storage box 2 are at least partially arranged alternately. Thus, in the present embodiment, in each case two bottom depressions 7 'are provided with a bottom projection 7 arranged in between adjacent each passage opening for a flexible reinforcing loop element 3. However, in the context of the present invention, any other number of bottom protrusions or depressions are possible, provided that they are arranged alternately.

Similarly, the side walls 6 each have a wall profiling in the form of wall projections 8 and wall recesses 8 ', which are arranged alternately in the longitudinal direction of the storage box 2. Between the bottom projections and depressions or wall projections and depressions, in each case intermediate surfaces 13 of different size are provided.

The dimensions of the respective projections and recesses 7, 7 ', 8, 8' can be varied within a wide range in the context of the present invention. In the present embodiment, the bottom protrusions 7 and the bottom recesses 7 'each have a depth (an extension perpendicular to the bottom 5) of 3 mm, resulting in a total gear depth of 6 mm. Similarly, the wall projections 8 and the wall recesses 8 'each have a height of 2 mm, which results in the region of the side walls 6 a total toothing depth of 4 mm.

In Fig. 1b is a perspective view of a second embodiment of a storage box 2 in the area between not shown here reinforcement loop elements schematically. This is different from the one in Fig. 1a first shown embodiment in that a larger number of bottom projections 7 and bottom recesses 7 'is arranged continuously alternating along the bottom 5. In addition, the bottom projections 7 and the Bottom recesses 7 'in the present embodiment have a trapezoidal shape and have flanks 7 "which are oriented essentially perpendicular to the bottom 5. Although in Fig. 1b intermediate surfaces 13 between the bottom projections 7 and bottom recesses 7', the toothing can continue with the surrounding concrete be increased by the intermediate surfaces 13 are made narrower or omitted altogether, so that the bottom projections 7 and bottom recesses 7 'directly into each other.

Furthermore, the in. Differs Fig. 1b Storage box 2 shown by the in Fig. 1a embodiment shown by the configuration of the wall projections or
depressions. Although in Fig. 1b only wall projections 8 are shown, the in Fig. 1b embodiment shown also in accordance with in Fig. 1a shown embodiment having alternately arranged wall projections and recesses. Regardless of the wall projections 8 in the in Fig. 1b shown embodiment formed in such a way that they have a lower anchoring resistance in concrete in a direction substantially perpendicular to the bottom 5 in a direction deviating therefrom. More specifically, the wall projections 8 (or the wall recesses 8 'not shown here) have an elongated shape which extends substantially perpendicular to the bottom and tapers in a wedge shape in the direction away from the bottom 5. This results in a reduced stress on the side walls 6 adjacent flanks of the respective concrete component.

Fig. 1c shows further embodiments of the storage box 2 in a schematic perspective view. It clarifies Fig. 1c in particular different design options for the wall recesses 8 ', wherein also in Fig. 1c (although not shown) may be provided according to alternating wall projections and wall recesses. A number of in the context of the present Invention conceivable embodiments of the wall recesses 8 '(or corresponding, alternately arranged wall projections 8) is in the lower part of Fig. 1c shown schematically. All of these embodiments have an elongated shape, which may for example also be formed by a group of several round or other shapes. In addition, in Fig. 1c to recognize that a tapered configuration of the molds is preferred in order to minimize the stress on the adjacent to the side walls 6 flanks of the respective concrete component. In this case, the wall recesses 8 'can taper both in their width and in their depth.

In the Fig. 1c Bottom recesses 7 'shown substantially corresponds to the embodiment shown in Fig. 1d, wherein instead of a rectangular shape here is a round shape is used.

Fig. 2a schematically shows a sectional view of another storage box of a connecting device according to the present invention, will be explained with reference to the various embodiments with regard to the configuration of the bottom projections and recesses. It shows Fig. 2b schematically different, exemplary sectional views along the line AA in Fig. 2a , It should be noted, however, that the sectional views shown in Fig. 2d are equally applicable to a cut which is described in Figs Fig. 2a in the region of the wall projections 8 and wall recesses 8 'is guided.

As in Fig. 2b can be seen, the bottom projections 7 and the bottom recesses 7 '(or the wall projections 8 and the wall recesses 8') in the context of the present invention in various ways be designed, the design on the whole as wavy or sawtooth-like to summarize. In this case, the individual projections 7 and recesses 7 'by preferred narrow interfaces may be separated from each other or even directly into each other. Also, the bottom projections 7 or bottom recesses 7 'may each be formed by two or more, jointly grouped projections or recesses, such as in Fig. 2b in the third embodiment shown from below.

Further shows Fig. 2a two variants for the design of the wall projections 8 and wall recesses 8 '. While the in Fig. 2a Right wall projections 8 and wall recesses 8 'have a constant height, the in Fig. 2a Wall projections 8 and wall recesses 8 'shown on the left are designed to taper (with decreasing height), with the advantages for the load-bearing behavior discussed above.

The use of the inventive device 1 for joining concrete components or precast concrete components 20 is shown in FIG Fig. 3 schematically shown in a perspective view. The connecting devices 1 are concreted into end faces 20 'of the prefabricated concrete components 20 in such a way that the interior defined by the side walls 6 faces outwards with the reinforcing loop elements 3. Subsequently, the precast concrete components 20 are placed with their end faces 20 'together, whereby a grout 4 is formed between adjacent connecting devices 1. The reinforcement loop elements 3 are deflected out of the storage boxes 2 in such a way that they overlap with a corresponding reinforcement loop element 3 of the adjacent storage box 2.

Subsequently, a transverse reinforcement in the form of a reinforcing bar 16 is inserted through the overlapping reinforcing loop elements 3, after which the grout 4 can be cast with a suitable grout. In this way, a transverse force-locking (and also normal force-fit) connection between the two precast concrete components 20 is achieved.

A top view of in Fig. 3 shown component connection is in Fig. 4 shown in a partial, schematic view. Although in Fig. 4 the precast concrete components 20 are not shown, it can be seen that the respective bottom projections 7, bottom recesses 7 ', wall projections 8 and wall recesses 8' for effective teeth both between the connecting device 1 and the concrete of the precast concrete components and wipe the connecting device 1 and the in the Vergussfuge 4 to be provided mortar allows.

Further leaves Fig. 4 recognize that the storage box 2, in particular the width b of the bottom 5, the height h and the inclination α of the side walls 6, is designed such that the two opposite deposit boxes 2 can be pushed together tightly to form the smallest possible Vergussfuge 4, which the respective flexible reinforcement loop elements (3) in the unfolded state including a tolerance field can just record. For this purpose, the width b of the bottom 5, the height h and the inclination α of the side walls 6 in the present embodiment are advantageously adapted to the course of the respective reinforcing loop element 3.

Claims (12)

1. Connecting device (1) for transverse non-positive connection of concrete units (20), in particular precast concrete units, comprising an elongated protective box (2) for introduction into an end-face side (20') of the units (20), which has a base (5) and at least two side walls (6) extending in a longitudinal direction of the base, having at least one flexible reinforcing loop element (3), which can be accommodated in the protective box (2) and can be deflected out from the latter, characterised in that the base (5) has a base profile with groups of base projections (7) and base depressions (7') starting from the base (5) and alternating in longitudinal direction, wherein each group has at least one base projection (7) or at least one base depression (7').
2. Connecting device according to claim 1, characterised in that the base projections (7) and base depressions (7') have in each case a maximum height, wherein the sum of the height of base projections (7) or base depressions (7') of adjacent groups defines a total toothing depth, which lies in the range from 3 to 9 mm, preferably 5.5 to 6.5 mm.
3. Connecting device according to claim 1 or 2, characterised in that the base projections (7) and base depressions (7') have essentially the same height.
4. Connecting device according to one of the preceding claims, characterised in that the side walls (6) have in each case a wall profile with groups of wall projections (8) and wall depressions (8') alternating in longitudinal direction, wherein each group has at least one wall projection (8) or at least one wall depression (8').
5. Connecting device according to claim 4, characterised in that the wall projections (8) and wall depressions (8') have in each case a maximum height, wherein the sum of the height of wall projections (8) or wall depressions (8') of adjacent groups defines a total toothing depth, which lies in the range from 2 to 6 mm, preferably 3.5 to 4.5 mm.
6. Connecting device according to claim 4 or 5, characterised in that the wall projections (8) and wall depressions (8') have essentially the same height.
7. Connecting device according to one of the preceding claims, characterised in that the base profile and/or the wall profile is designed to be wave-like or like a saw tooth.
8. Connecting device according to one of claims 1 to 6, characterised in that the base projections (7) and/or the base depressions (7') are designed to be like a trapezium and have flanks (7"), which are aligned essentially vertically to the base (5).
9. Connecting device according to one of the preceding claims, characterised in that the wall projections (8) and the wall depressions (8') have a lower anchoring resistance in concrete in a direction vertical to the base (5) than in a direction deviating therefrom.
10. Connecting device according to claim 9, characterised in that the wall projections (8) and the wall depressions (8') have an elongated shape, which extends essentially vertically to the base (5) and preferably tapers in the direction facing away from the base (5).
11. Connecting device according to one of the preceding claims, characterised in that the base projections (7) and the base depressions (7') or the wall projections (8) and the wall depressions (8') of adjacent groups are separated by a narrow intermediate surface (13) or transfer directly into one another.
12. Connecting device according to one of the preceding claims, characterised in that the protective box (2), in particular the width of the base (5), the height and/or the pitch of the side walls (6), is designed such that two opposing protective boxes (2) of concrete units (20) connected to one another form as small as possible a sealing joint (4), which may accommodate the particular flexible reinforcing loop elements (3) in the unfolded state including a tolerance zone.

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