AU2017201303A1

AU2017201303A1 - Connecting system for joining precast concrete parts

Info

Publication number: AU2017201303A1
Application number: AU2017201303A
Authority: AU
Inventors: Dirk Albartus; Robert Garke; Thorsten Heidolf; Richard Morsink; Paulus van de Schoor
Original assignee: Leviat GmbH
Current assignee: Leviat GmbH
Priority date: 2016-03-05
Filing date: 2017-02-27
Publication date: 2017-09-21
Also published as: PL3214235T3; HK1243751A1; CN107152087B; EP3214235B1; CN107152087A; EP3214235A1

Abstract

Abstract 5 The invention relates to a connecting system for connecting a first precast concrete part to a second precast concrete part. The connection system has a prefabricated connector (3) and a connection element, whereby the prefabricated connector (3) comprises a base plate (4) and at least one pouring anchor (5) connected to the base plate (4) for pouring into the first precast concrete part. The base plate (4) lies in a base plane (E) and has a through-opening 0 (6) for the connecting element (7). The cross section of the through-opening (6) is larger than the cross section of the connecting element. The connecting system has positioning means (13) for free positioning and for positive locking fixation of the connecting element, passed through the through-opening (6) in all directions lying in the base plane (E) of the base plate (4). A- -- I5 16 A -A 3-- Z5- 3 zo -' i

Description

2017201303 27 Feb 2017

Connecting System for Joining Precast Concrete Parts

The invention relates to a connecting system for connecting a first precast concrete part to a 5 second precast concrete part according to the genus of claim 1.

Structures are widely used in prefabricated concrete parts, which are connected to one another by suitable connecting systems. Such connecting systems as known in the prior art rely on prefabricated connectors, which are poured therein in a suitable number and 0 positioning during the manufacture of the respective precast concrete part. Later they are used to accommodate suitable connecting elements. These are used on site and tightened, whereby the concrete parts are joined together

Such a connection system is known, for example, from DE-OS 26 23 803. The connecting 5 system shown there comprises a pair of prefabricated connectors, whereby one such prefabricated connector is poured into the adjoining edge regions of two precast concrete parts. The respective prefabricated connector comprises a base plate with two pouring anchors welded approximately vertically, whereby the pouring anchors and the base plate are completely poured into the concrete material in areas adjacent to the pouring anchors. In 0 its centre region, the base plate has a through-opening for a connecting element. The associated region of the prefabricated connector is exposed without a concrete encapsulation so that the connecting element can be inserted and locked by means of a 90° rotation comparable to a bayonet closure. As completion of the assembly process, a clamping wedge, which is toothed on the outer surfaces and is otherwise conical, is inserted, 25 which, on the one hand, prevents a reverse rotation and thus releases the connecting element, and which, on the other, axially braces the two concrete parts. Nascent operating loads are introduced into the two concrete parts by the aforementioned pouring anchors.

Although such a connection has at least proved itself in principle, some aspects have proven 30 to be disadvantageous. Thus, the aforementioned connecting system requires that a pair of a total of two prefabricated connectors have to be cast in each connection point, which entails corresponding costs. In order that the bracing can be carried out in the prior art, the two concrete parts to be connected must be precisely aligned with one another. Such exact alignment and its retention, in particular before and during bracing, but also the braced 35 components against one another, are difficult and can cause a great deal of efforts. 2017201303 27 Feb 2017

The invention is based on the object of further developing a generic connecting system for connecting precast concrete parts in such a way that reliable positioning and positional fixing of the two concrete parts against one another is possible with reduced efforts. 5

This object is achieved by a connecting system having the features of claim 1.

According to the invention, it is provided that the connecting system comprises one of the prefabricated connectors described herein as well as an associated connecting element, 0 wherein the cross section of the through-opening in the base plate being is larger than the cross section of the connecting element. Further, the connecting system has positioning means for the free positioning and the form closure position fixing of the connecting element pushed through the opening in the base plane of the base plate. This permits an exact relative positioning before and during the joining process, whereby a corresponding form 5 closure position fixation of the two concrete parts next to one another is reliably maintained after the connection has been fixed.

Various possibilities are considered for the configuration of the form closure position fixation. In a first preferred embodiment, said positioning means at least comprises a first eccentric 0 ring, which can be rotated around a rotational axis relative to the base plate with the through-opening and can be fixed in a selected rotational angular position. The first eccentric ring has a positioning opening arranged eccentrically with respect to its axis of rotation for receiving and positioning the connecting element. By selecting a specific rotational angle of the eccentric ring, its positioning opening and thus also the inserted connecting element can be 25 brought into a certain desired relative position with respect to the prefabricated connector and thus with the assigned precast concrete part. As soon as the connecting element is tightened and the connecting point is loaded, it is no longer possible to twist the eccentric ring because of the forces acting thereon. The connecting element reliably retains its relative positioning relative to the precast concrete part, as a result of which the two precast concrete 30 parts connected to each other also maintain their relative positioning.

It is sufficient to provide only such an eccentric ring at a connection point or at a prefabricated connector. In a preferred development, however, the positioning means also additionally comprise a second eccentric ring, which is pivoted in the through-opening of the 35 base plate about a rotational axis and can be fixed in a selected rotational angular position, and which has a positioning port, eccentrically arranged with reference to its rotational axis. In this case, the abovementioned first eccentric ring is then pivoted, positioned and fixed in the selected rotational angular position in the eccentric positioning opening of the second eccentric ring. In the unstressed state, both eccentric rings can be rotated relative to each other and also relative to the base plate, so that the positioning opening of the first eccentric ring, which accommodates the connecting element, can be displaced and positioned as 5 desired together with the connecting element in all directions of the plane of the base plate. In the base plane of the base plate, therefore, a two-dimensional positioning takes place, which is fixed under load when using only one eccentric ring. Together with the axial clamping, this results in a 3-D positive-locking relative positioning of the connecting element relative to the poured-in prefab connector, which likewise entails a 3-D positive-locking, 0 relative positioning of the two precast concrete parts. 2017201303 27 Feb 2017

As an alternative to the above-mentioned eccentric ring arrangement, it may be expedient that the positioning means comprise at least one serrated plate, which has a positioning opening for accommodating and positioning the connecting element and is provided with a 5 ratchet teeth on at least one of its flat sides. In addition, the base plate has at least one ratchet teeth corresponding to the one of the serrated plate. The ratchet teeth are designed in such a way that they provide two different locking directions, which are located at a right angle to each other. This can be a one-sided cross-toothing. Preferably, however, the two different ratchet teeth are arranged on the two opposing flat sides of the base plate, whereby 0 the positioning means include two serrated plates provided for the two opposing flat sides of the base plate.

In the unstressed state, the locking plate and, together with it, the pushed-through connecting element can be displaced and positioned as desired. Under load, that is to say in 25 the clamped state of the connecting element, however, the lock-in positions between the serrated plate and the toothed base plate engage so that a corresponding form closure occurs. In any event, a form closure is produced in all directions of the base plane of the base plate. Together with the force transmission perpendicular to the base plane, as in the case of the above-described eccentric rings, a three-dimensional, spatial form closure is 30 produced between the connecting element and the prefabricated connector, which likewise results in such a 3-D form closure between the two interconnected precast concrete parts.

In a further preferred aspect of the invention, a connecting element is poured into the first precast concrete part, while a pick-up element for the connecting element is inserted into the 35 opposite region of the adjoining second precast concrete part. Preferably, the connecting element is a screw, while the pick-up element is a screw sleeve. The connecting element is pushed through the opening from one side of the base plate facing the pick-up element or 2017201303 27 Feb 2017 the screw sleeve and is connected to the pick-up element or screwed into the screw sleeve. As a result, it is possible to make do with only a single example of the prefabricated connector according to the invention at each connection point. In addition, the connecting element must be tightened only from one side, namely from the side of the first precast 5 concrete part, which receives the prefabricated connector. The use of materials and the assembly effort are minimized.

It may be sufficient to arrange one or more pouring anchors only on one edge or on two adjoining edges of the base plate. In a preferred further development of the invention, at 0 least one pouring anchor adjoins two opposing edges of the base plate. In particular, the two aforementioned pouring connectors are disposed mirror-symmetrically with respect to a plane of symmetry of the prefabricated connector. As a result of this, a symmetrical force introduction into the base plate is produced, comparable to a two-section connection, which contributes to relieving the design. 5

In a preferred embodiment, at least one pouring anchor and, in particular, all pouring anchors are designed as bent frame element, which in particular together with the base plate forms a closed circumferential frame. In the case of a small material insert, the said frame produces a high anchoring effect in the concrete. 0

Embodiments of the invention are described in more detail below with reference to the drawing. Shown here are:

Fig. 1 shows, in a schematic front view, two precast concrete parts which are indicated, in 25 which a prefabricated connector according to the invention is cast in a first precast concrete part, a connecting element in the form of a screw being screwed into a screw sleeve of the second precast concrete part, And in addition, positioning means for positive position fixing are used, 30 Fig. 2 shows a perspective view of a first exemplary embodiment of the prefabricated connector according to the invention with two serrated plates and ratchet teeth, which act in two mutually perpendicular directions, and

Fig. 3 is a perspective view of a further exemplary embodiment of a prefab connector 35 according to the invention with two inserted eccentric rings for a form-closure relative positioning.

Fig. 1 shows a schematic front view of two precast concrete parts 1, 2 connected to each other in accordance with the invention. In the first precast concrete part 1, a schematically indicated prefabricated connector 3 according to the invention is partially cast while maintaining a mounting trough 32. It may be expedient to embed a prefabricated connector 3 5 similar to the first precast concrete part 1 facing the second precast concrete part 2. In the preferred embodiment shown, however, the connecting point or the connecting system used here comprises only a single prefabricated connector 3, which is inserted into the first precast concrete part 1. In the opposite precast concrete part 2, instead of this, a pick-up element is used, which is designed here as a screw sleeve 31. 2017201303 27 Feb 2017 0

The prefabricated connector 3 comprises a base plate 4 as well as at least one, in this case two pouring anchors 5, which are connected to the base plate 4. The prefabricated connector 3 is thus cast into the concrete material of the first precast concrete part 1 in such a way that its pouring anchors 5 are complete and the base plate 5 4 are enclosed by the 5 two pouring anchors 5 from the concrete material only in sections. A central section of the base plate 4 is free and is bounded in the direction of the adjacent second precast concrete part 2 by the mounting recess 32, which is open towards the observer. A connecting element 7, which is configured here as a screw with an exemplary hexagonal screw head, is inserted into the mounting trough 32 of the first precast concrete part 1, and from the side of the base 0 plate 4, which faces the adjacent second precast concrete part 2 with the screw sleeve 31 inserted therein. The base plate 4 of the prefabricated connector 3 is inserted and screwed into the screw sleeve 31 of the second precast concrete part 2.

The screw sleeve 31 can be designed as a cast-in sleeve or bolt anchor. Alternatively, 25 however, an anchor inserted into a suitable bore can also be considered. The screw sleeve preferably has an internal thread for picking-up an external thread of the connecting element 7. However, a self-cutting pick-up can also be considered. Instead of the screw sleeve 31, however, a different pick-up element for the connecting element 7 can be provided. For example, in the context of the invention, that the connecting element 7 is designed not as a 30 screw but as a quick-action tensioning element, bayonet element or the like, wherein the aforementioned pick-up element is then matched to the configuration of the connecting element 7.

In addition, positioning means 13 are also provided as part of the said connecting system, 35 which are only schematically indicated here and are described in more detail below. They serve for free positioning and subsequent positive position fixing of the connecting element 7 relative to the base plate 4. As soon as the connecting element 7 is tightened on one side by means of a tool inserted into the mounting trough 32, the two concrete parts 1, 2 relative to each other are fixed not only in a force-locking manner but also in a form closure manner. 2017201303 27 Feb 2017

Fig. 2 shows in a perspective view a first exemplary embodiment of the prefab connector 3 5 for the connection system according to Fig. 1. In the perspective view according to Fig. 2, it can be seen in conjunction with Fig. 1 that the base plate 4 has a through-hole 6 for the connecting element 7, but the cross section of the through-opening 6 is considerably larger than the cross section of the connecting element 7. This circumstance initially permits, within certain limits, a free relative positioning of the connecting element 7 (Fig. 1) relative to the 0 prefab connector 3 as described in the following:

In the exemplary embodiment according to Fig. 2, the positive-locking positioning means 13 are formed by a combination of at least one serrated plate 20 with the base plate 4. In the present case, two identical serrated plates, which are mounted in different orientations, are 5 provided. The serrated plates 20 are each provided with a positioning opening 16 for at least approximately clearance-free mounting of the connecting element 7 according to Fig. 1. The arrangement is shown here in exploded view. During assembly, a first upper serrated plate 20 is placed on the upper side of the base plate 4 in accordance with an arrow 33. The serrated plate 20 is provided with ratchet teeth 21 on its flat side facing the assembled state 0 of the base plate 4, while the base plate 4 carries, on its surface facing the serrated plate 20, corresponding ratchet teeth 23. The same applies to the second; here lower serrated plate 20, which during assembly is pressed against the underside of the base plate 4. On its underside facing the second serrated plate 20, the base plate also has a ratchet teeth 22 which, in turn, corresponds to the ratchet teeth 21 of the second, lower serrated plate 20. 25

The base plate 4 is located in a base plane E. In the exemplary embodiment shown, all ratchet teeth 21, 22, 23 are formed by parallel fins in the basic plane E, whereby locking directions 24, 25, perpendicular to the respective fin presentation are predetermined. The ratchet teeth 22, 23, which are formed on the two opposite flat sides of base plate 4, differ, 30 however, from each other in the case of geometry which is otherwise identical, insofar as they specify two different locking directions 24, 25, arranged at right angles to one another. As long as the connecting element 7 according to Fig. 1 has not yet been braced, a locking relative positioning of the functional unit comprising the connecting element 7 and the locking plate 20 relative to the prefabricated connector 3 can be undertaken. As soon as the 35 connecting element 7 is tightened, a form closure is produced in the axial direction of the connecting element 7 and also in the locking directions 24, 25. The different locking directions 24, 25 complement each other in the form of a positive position fixation in all in the base plane E of the base plate 4. In conjunction with the axial form closure, a 3-D position fixing of the connecting element 7 (Fig. 1) acting relative to the prefabricated connector 3, which is effective in all spatial directions, results in, which in the tightened state also leads to such a 3-D positive-locking of position of the two assembled concrete parts 1,2. 2017201303 27 Feb 2017 5

Instead of the parallel fins as shown, cross toothing or the like can also be provided on the base plate 4 and on the locking plate 20. In this case, it may suffice to use only a single serrated plate 20 for achieving the three-dimensional position fixation as described above. 0 A further feature according to the invention of the prefabricated connector 3, shown in Fig. 2, relates to the embodiment of at least one, here two pouring anchors 5. It can be seen that the prefabricated connector 3 has a symmetry plane S staying perpendicular to the base plane E, whereby the pouring anchors 5 are arranged mirror-symmetrically to the symmetry plane S. The base plate 4 has two edges 26, 27 lying opposite the plane of symmetry. At 5 least one pouring anchor 5 adjoins each of the two edges 26, 27, in each case exactly one pouring anchor 5. 2, the two pouring anchors 5 are designed as frame elements 8, which are bent out of round iron, which are welded laterally to the base plate 4, and together with the base plate 4 each forms a closed circumferential frame. Instead of the welded design of the prefabricated connector 3, as shown in Fig. 2, other prefabricated connectors, for example, 0 in the form of sheet metal parts and/or in particular in the embodiment according to Fig. 3, can also be used in the connection system according to Fig. 1.

Fig. 3 shows a perspective view of a further embodiment of a prefabricated connector 3 according to the invention. For the sake of clarity, only the base plate 4 is shown here 25 without the actual pouring anchors 5, present and designed as per Fig. 2. Flere too, the cross section of the through opening 6 is significantly greater than the cross section of the connecting element 7, shown in Fig. 1. Deviating from the embodiment example as per Fig. 2, the positive-locking positioning means 13 are not formed by serrated plates 20 together with a locking base plate 4. Rather, the positioning means 13 here comprise at least one first 30 eccentric ring 14 with a positioning opening 16 for mounting and free, variable positioning of the connecting element 7 relative to the base plate 4 of the prefabricated connector 3. It is advantageous to use the first eccentric ring 14 directly into the through-opening 6 of the prefabricated connector 3. In the preferred embodiment as illustrated, however, a second eccentric ring 17 with an associated positioning opening 19 is also provided. The 35 arrangement is shown here in exploded view. In the assembled state, the second eccentric ring 17 is pivoted in the through-opening 6 of the base plate 4. The circular through-opening 6 has a hole axis 28, which in the assembled state predetermines an axis of rotation 18 of 2017201303 27 Feb 2017 the second eccentric ring 17. It is also apparent that the positioning opening 19 of the second eccentric ring 17 is located eccentrically with an associated hole axis 30, that is to say with a radial distance from the axis of rotation 18. 5 The same applies to the first eccentric ring 14: the latter is pivoted in the positioning opening 19 of the second eccentric ring 17 in the mounted state. An associated axis of rotation 15 of the eccentric ring 14 is positioned parallel to the hole axis 30 of the positioning opening 19 in the second eccentric ring 17. The positioning opening 16 formed in the first eccentric ring 14 lies eccentrically with an associated hole axis 29, i.e. in the radial direction distance from the 0 axis of rotation 15 of the first eccentric ring 14. Both eccentric rings 14, 17 can be rotated independent of each other or relative to the base plate 4. This permits an arbitrary positioning of the positioning opening 16 and of the connecting element 7 (Fig. 1) held therein relative to the base plate 4 in all directions, which lie in the base plane E, as shown in Fig. 2. From the overall view of Figs. 1 and 3, it follows that the said relative positioning is 5 also identical with a relative positioning of the two precast concrete parts 1,2.

Further, it becomes clear that in the tightened state of the connecting element 7 a relative displacement is no longer possible. Fig. 3 shows that the first eccentric ring 14 rests with a flange on the surface of the second eccentric ring 17, while the second eccentric ring 17 0 rests with a flange on the surface of the base plate 4. As a result of the axial clamping of the connecting element 7, a sufficiently large surface pressure is produced, as a result of which twisting is no longer possible. If the two concrete parts 1, 2 also apply loads in the base plane E of the base plate 4, this also leads to corresponding surface pressures on the circumferential surfaces of the two eccentric rings 14, 17, which prevent a rotation. The 25 tightened connecting element 7 is positively held in the positioning opening 16 of the first eccentric ring 14 and is held in a three-dimensional manner, i.e. in all spatial directions positively and in combination with force-fitting relative to the prefab connector 3. As a result, the two concrete parts 1, 2 are also fixed in position in the same way in a form closure and force-locking manner. Flowever, it may be expedient to provide a form closure in the 30 direction of rotation between the eccentric rings 14, 17 and also relative to the base plate. In this case, a pure form closure acting in all directions is formed.

Unless expressly mentioned otherwise, the exemplary embodiments according to Figs. 2 and 3 correspond to one another in other features and reference symbols. 8

Claims

Claims

1. A connecting system for connecting a first precast concrete part (1) to a second precast concrete part (2), comprising a prefabricated connector (3) and a connecting element (7), whereby the prefabricated connector (3) comprising a base plate (4) and at least one pouring anchor (5) connected with the base plate (4), whereby the base plate (4) lies in a base plane (E) and has a through-opening (6) for the connecting element {7), characterized in that the cross section of the through-opening (6) is larger than the cross section of the connecting element {1), and that the connecting system has positioning means (13) for free positioning and positively locking the connecting element (7) in all the directions lying in the base plane (E) of the base plate (4).
2. Connection system as claimed in 1, characterized in that the positioning means (13) comprise a first eccentric ring (14), which can be rotated about a rotational axis (15) relative to the base plate (4) with the through-opening (6) and can be configured in a desired angular position, and which has a positioning opening (16) arranged eccentrically with respect to its axis of rotation (15) for mounting and positioning the connecting element (7).
3. Connection system as claimed in 2, characterized in that the positioning means (13) comprise a second eccentric ring (17), which is pivoted about an axis of rotation (18) in the through-opening (6) of the base plate (4) and can be configured in a selected rotational angular position (19), and which has a positional opening (19) arranged eccentrically with respect to its axis of rotation (18), in which the first eccentric ring (14) can be pivoted about its axis of rotation (15) and can be fixed in a selected rotational angular position.
4. Connection system as claimed in 1, characterized in that the positioning means (13) comprise at least one serrated plate (20), which has a positioning opening (16) for mounting and positioning the connecting element (7) and on at least one of its flat sides it is provided with a ratchet teeth (21) and that the base plate (4) has a ratchet teeth (22, 23) corresponding to the ratchet teeth (21) of the serrated plate (20), wherein the ratchet teeth (21, 22, 23) are designed in such a way that they provide two different locking directions (24, 25).
5. Connection system as claimed in 4, characterized in that the locking directions (24, 25) are at a right angle to each other.
6. Connection system as claimed in 4, characterized in that two different ratchet teeth (22, 23) with different locking directions (24, 25) are disposed on the two opposing flat sides of the base plate (4), and in that the positioning means (13) comprise two serrated plates (20) provided at both the opposing flat sides of the base plate (4).
7. Connection system according to any of claims 1 to 6, characterized in that a prefabricated connector (3) is cast into the first precast concrete part (1), that in the opposite region of the adjoining second precast concrete part (2) a pickup element is inserted for the connecting element (7), whereby the connecting element (7) is pushed through the through opening (6) from a side of the base plate (4) facing the pick-up element, and from there, it is connected to the pick-up element of the second precast concrete part (2).
8. Connection system as claimed in 7, characterized in that the connecting element (7) is a screw, and that the pick-up element inserted in the second precast concrete part (2) is a screwed sleeve (31), whereby the screw is put through the through-opening (6) from one side of the base plate (31) opposite the screw sleeve 4) and screwed into the screw sleeve (31).
9. Connection system as claimed in any of claims 1 to 8, characterized in that the base plate (4) has two opposing edges (26, 27), and that at least one pouring anchor (5) adjoins each of the two edges (26, 27).
10. Connection system as claimed in any of claims 1 to 9, characterized in that the prefabricated connector (3) has a plane of symmetry (S), and the pouring connectors (5) are arranged symmetrically to the plane of symmetry (S).
11. Connection system as claimed in any of claims 1 to 10, characterized in that at least one pouring anchor (5) is designed as a bent frame element (8), which forms a closed surrounding frame together with the base plate (4).
12. Connection system as claimed in claim 11, characterized in that all the pouring anchors are designed as bent frame elements (8).