EP2055846B1 - Use of elements for connecting prefinished concrete elements - Google Patents

Abstract

In a construction project requiring the use of steel wire-reinforced concrete, wire loops (2) are anchored at each end (3) in a closed frame (1). The loops pass through apertures (1') close to the frame end (1a, 1b).

Description

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 vertical supports 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 can consist of both reinforcing steel and flexible rope elements. Such fasteners are for example in the WO 03/008737 disclosed.

By folding out these reinforcing 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 transmit forces in different directions thanks to the overlapping connecting elements, ie tensile forces in the overlap perpendicular to the end face of the precast elements, lateral 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.

For the transverse force transmission parallel to the joint various industrially manufactured fasteners are known, as shown schematically in FIG Fig. 5 are shown. There are continuous profile elements ( Fig. 5c )), such as the Pfeifer VS® rail, PEEIEER VS® rail, Betomax Schlaufmax, Philipp rail, and also individual elements ( Fig. 5a ), b)), which are to ensure the transverse force transmission by repeatedly repeated arrangement of reinforcing loops in the precast joint above the other. The lengths of these rails and strips is for logistical reasons at about 1.20 m. To reach floor height, several rail elements are joined together seamlessly. If fewer loops are needed in a joint, individual deposit boxes are used with only one loop at a distance. By way of example, two and two individual loops may be required in the floor above.

The individual elements are, for example, the Pfeifer VS® box ( Fig. 5a )) and the Philipp connection loop ( Fig. 5b )) to disposal. Both have in common that it is an elongated storage box, at one end of a rope loop is arranged, which can be stored inside the storage box. The overall length is essentially matched to the one loop and much shorter than the rails and bars. In the final state, the individual boxes are arranged at the bottom of the Vergussnut, and the opposing loops are folded out and connected overlapping by the introduced and hardening mortar.

In the case of the known connecting element elements, however, it has been shown that, especially in the region of individual elements and / or free edges, premature cracking in the concrete or mortar of the connection occurs, which impairs the load capacity, rigidity and durability of the connection.

Further, the US 6,308,478 B1 a connecting device with a plurality of, for example, four or more loop elements, which can be received in a common storage box and folded out of this. In addition, the reveals CH 666931 A5 a connecting device with a storage box and a plurality of uniformly arranged reinforcing steel elements, which are receivable in the storage box and herausbiegbar out of this.

Presentation of the invention

It is therefore an object of the present invention to enable the transverse force-locking connection of precast concrete elements an improved load-bearing behavior of a compound under transverse force stress.

This object is achieved by a method for producing a precast concrete part according to claim 1, a precast concrete part according to claim 5, a combination according to claim 8 and a use according to claim 9. Advantageous developments of the invention are specified in the dependent claims.

The invention is based on the finding that in compact fasteners with only one reinforcement loop or at the free ends of rail-like fasteners with transverse force stress no balance of power adjusts, in which the essential tensile forces are absorbed in the connection by reinforcing elements.

The invention therefore aims to design and use the connecting element in particular even with compact dimensions such that the tensile forces that arise in the connection as a result of an oblique concrete strut by transverse force stress, are absorbed and forwarded by reinforcing elements. For this purpose, the invention provides that in a generic connection element, the penetration openings of the two reinforcing loop elements are provided near opposite ends of the storage box. In other words, in the present invention, two opposing reinforcing loops are in the bent-out state (final state) near the respective ends of the storage box.

This results in each individual, used according to the invention fastener a self-contained support behavior in which due to transverse force stress an inclined compression strut can form in concrete, which can be supported at their (imaginary) ends on the reinforcing loops of the connecting element to initiate excessive tensile forces in the concrete or mortar to avoid. In this way, a harmful cracking in the connection area can be effectively prevented, which in addition to the load capacity and the durability and rigidity of the compound significantly increased. At the same time, the connecting element used according to the invention has a simple construction and can be used without modification of the previous construction process without problems.

In this case, a connecting element with exactly two reinforcing loop elements is an embodiment according to the invention. This is highly variable in use and has, in contrast to known individual elements, a significantly improved, self-contained load-bearing behavior.

According to one embodiment of the present invention, it is provided that the maximum distance of the near-end penetrating openings from one end in the longitudinal direction of the storage box is less than 0.5 times a loop length by which the reinforcing loop elements project from the storage box in the bent-out state. As a result, a particularly compact connection element is provided. In addition, a concrete compression strut forming as a result of transverse force stress can be effectively supported at the proximal ends of the storage box with the perforation openings and thus the installed reinforcement loop elements arranged close to the edge, thereby further improving the load bearing behavior of the connection element. It is preferred that the maximum distance of the proximal penetrating openings from one end in the longitudinal direction of the storage box is less than 0.25 times, particularly preferably 0.1 times, the loop length.

With regard to compact delivery and installation dimensions of the connecting element according to the invention is provided according to a development that the length of the storage box is less than 2.5 times a loop length by which the reinforcing loop elements protrude in the bent-out state of the storage box. At the same time, however, this configuration also ensures that the reinforcing loop elements in the installed state are sufficiently close to each other so that the inclination of a pressure strut between the reinforcing loop elements does not become too low and therefore the compressive forces that occur do not become excessively large. An even more compact connection element is obtained according to the invention if the length of the storage box is less than 1.5 times the loop length.

According to one embodiment of the invention, it is further provided that at least two reinforcing loop elements in the state taken in the storage box facing each other and preferably at least partially overlap each other, so that the connecting element according to the invention has hardly larger dimensions than a known single loop element, but has a drastically improved structural behavior.

In order to ensure effective absorption and transmission of the forces occurring in the concrete as a result of a transverse force stress, according to a development of the present invention it is provided that the trolley bottom is profiled at least in sections by elevations and / or depressions. This ensures that the reinforcing loop elements of the connecting element also activates under transverse force stress before excessive deformation and cracking occurs in the area of the joint. It is particularly preferred that the elevations and / or depressions are provided adjacent to the penetration openings, so that adjusts the desired, closed support system with the involvement of the reinforcement loop elements.

The connecting element according to the invention can be used individually or in combination with similar or different types of connecting elements. In this way, the carrying behavior of the overall connection is advantageously influenced by a locally limited measure.

Brief description of the drawings

Fig. 1a

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

Fig. 1b

shows schematically a perspective view of a second embodiment of the connecting element according to the invention;

Fig. 2

shows schematically a perspective view of a third embodiment of the connecting element according to the invention;

Fig. 3

shows schematically a model of the structural behavior of two interconnected by connecting elements precast concrete elements;

Fig. 4

shows schematically a transverse force-locking connection of precast concrete parts using the connecting element according to the invention;

Fig. 5

shows schematically connecting elements according to the prior art.

Detailed description of preferred embodiments

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

Fig. 1a schematically shows a connecting element 20 according to a first embodiment of the present invention. The connecting element 20 serves for the transverse force joining of precast concrete elements to a joint with transverse forces parallel to the joint longitudinal direction and comprises a storage box 1 and two bendable reinforcing loop elements 3. The storage box 1 has an elongated, hollow box-like shape with a length L and two longitudinal ends 1a, 1b. In a storage box floor 1c two openings 1 ', 1 "are provided, on which the reinforcement loop elements 3 penetrate the storage box 1.

The reinforcement loop elements 3 may be, for example, beta steel bars or flexible cable elements which are connected at their free ends via a clamp 2, sleeve or the like.

The penetrating openings 1 ', 1 "are according to the invention provided near the opposite ends 1a, 1b of the storage box 1, as in Fig. 1a shown. It is preferred that the in Fig. 1a shown, the maximum distance a of the penetration openings 1 ', 1 "from the ends 1a, 1b of the storage box 1 is less than 0.5 times the below defined in more detail loop length 1. In addition, the maximum distance a of the penetration openings 1', 1 "of the ends 1a, 1b of the storage box 1, at least for compact fasteners preferably less than 0.1 times the length L of the storage box.

Further, the length L of the storage box is designed such that the reinforcing loops 3 can be easily accommodated inside the storage box 1, as in FIG Fig. 1a shown. The loops 3, in contrast to the prior art, face each other. Based on this state, the loops 3 can be bent out of the storage box 1 to the in Fig. 2 to reach shown final state in which the loops 3 protrude by a loop length 1 of the storage box 1. In the in Fig. 1a In the embodiment shown, the length L of the storage box 1 is slightly less than 2.5 times the length of the loop 1.

Fig. 1b shows a connecting element 20 according to a second preferred embodiment of the invention. This in Fig. 1b shown connecting element 20 differs from that according to the in Fig. 1a shown, first embodiment in the length L of the storage box 1. This is in the in Fig. 1b shown second embodiment considerably less and is slightly less than 1.5 times the loop length 1. This results in a more compact connection element in which the loops 3 are arranged overlapping in the folded state. At the same time, in the second embodiment, the maximum distance a of the penetration openings 1 ', 1 "in absolute terms is approximately the same as in the first embodiment, which, however, results in a somewhat larger ratio between the maximum distance a and length L of the storage box.

A third preferred embodiment of the connecting element 20 according to the invention is shown in FIG Fig. 2 schematically shown in a perspective view. This is different from the one in Fig. 1a shown first embodiment by profiling, which are provided in the form of recesses 12 in the storage box floor 1 c. In this case, the recesses 12 are provided in the present embodiment adjacent to the penetration openings 1 ', 1''.

Further shows Fig. 2 the connecting element 20 with bent by the length of 1 Reinforcement loop elements 3, ie in the final state, which occupies the connecting element in a combination of precast concrete parts. As reference point for the loop length 1 serves here, as in Fig. 2 shown, the storage box floor 1c.

A connection of precast concrete parts using the connecting element 20 according to the invention is shown schematically in FIG Fig. 4 showing both a vertical and a horizontal sectional view of the connection. As can be seen in particular in the horizontal sectional view, shown below, the connecting elements 20 according to the invention are provided in end-side potting grooves 11 of precast concrete elements 5 to be joined together. The precast concrete elements 5 are placed side by side with their end faces in such a way that a gap 10 forms in the region of the grouting grooves 11 and is later filled with grout. After the juxtaposition of the precast concrete elements 5, the reinforcing loop elements 3 are bent out of the custody boxes 1, so that the reinforcing loop elements 3 of opposing connecting elements 20 overlap. Subsequently, a mounting bar 8 made of reinforcing steel is guided by the overlaps. Finally, the grouting of the joint is made to connect the finished parts 5 non-positively with each other. In this case, the connecting elements 20, as in the upper part of Fig. 4 can be seen in the vertical section, preferably evenly arranged over the precast concrete elements 5.

A model for the in the range of two interconnected by connecting elements 20 precast concrete 5 adjusting behavior is schematically in Fig. 3 shown. In the presence of a transverse force stress Q, whose effective direction is indicated schematically by arrows 6 in FIG Fig. 3 is specified, formed between the precast concrete 5 in the grout or concrete a pressure field, by a inclined concrete strut 7 can be modeled. The model, inclined concrete strut 7 is supported at its ends on the storage boxes 1 of the connecting elements 20, wherein both the Verwahrkastenenden 1 a, 1b and the recesses 12 of the deposit box bottom 1 c contribute to improved support and load transfer of the strut 7. In order to achieve an equilibrium of forces, the forces 5 aroused by the strut 7 must be taken up and down. This takes place in the model by means of the reinforcing loop elements 3 arranged on the storage bin ends, in which horizontal drawstrings 4 are formed. Such equilibrium without significant tensile stress on the concrete can be adjusted by the advantageous arrangement of the reinforcing loop elements 3 when using the connecting element 20 according to the invention, which has hitherto not been possible with known single loop elements. Therefore, the use of the connecting element 20 according to the invention prevents the formation of damage and cracks in the mortar or concrete and thus significantly increases the load capacity, rigidity and durability of the connection.

The preferred embodiments described above each have exactly two reinforcing loop elements, since this results in particularly compact and versatile connecting elements with a closed carrying behavior.

LIST OF REFERENCE NUMBERS

1

Deposit box for the reinforcement loops

1a, b

Verwahrkastenenden

1c

storage box

1 ', 1 "

penetration holes

2

End anchorage of the reinforcement loop

3

Reinforcement loop made of wire rope or reinforcing steel

4

Horizontal traction

5

Precast concrete wall or pedestal

6

Transverse force parallel to the wall joint

7

Oblique pressure strut in the casting area

8th

Assembling rod made of reinforcing steel

9

Area with grouting mortar

10

Joint between two precast concrete elements

11

grouting groove

12

Depressions or elevations to improve the strut engagement

20

connecting element

L

Length of the storage box

1

strap

Claims (13)

1. Method for the manufacture of a precast concrete part (5), in which at at least one end face of the precast concrete part (5) are arranged several connecting elements (20) which serve to join precast concrete parts (5) by transverse force locking at a joint (10) with transverse forces parallel to the longitudinal direction of the joint and comprise a preferably elongate storage box (1) and exactly two reinforcing loop elements which can be received in the storage box (1) and bent out of the latter, wherein the reinforcing loop elements (3) pass through the storage box (1) in each case in the region of a through-opening (1', 1") in the storage box (1), characterised in that the through-openings (1', 1") for the two reinforcing loop elements (3) are provided near opposite ends (1a, 1b) of the storage box (1).
2. Method according to claim 1, characterised in that the connecting elements (20) are arranged evenly over the precast concrete part (5).
3. Method according to claim 1 or 2, characterised in that the connecting elements (20) are arranged adjacent to each other.
4. Method according to any of the preceding claims, characterised in that the connecting elements (20) are arranged on the bottom of a casting groove (11) at the end face of the precast concrete part (5).
5. Precast concrete part, in which at at least one end face are arranged several connecting elements (20) which serve to join precast concrete parts (5) by transverse force locking at a joint (10) with transverse forces parallel to the longitudinal direction of the joint and comprise a preferably elongate storage box (1) and exactly two reinforcing loop elements which can be received in the storage box (1) and bent out of the latter, wherein the reinforcing loop elements (3) pass through the storage box (1) in each case in the region of a through-opening (1', 1") in the storage box (1), characterised in that the through-openings (1', 1") for the two reinforcing loop elements (3) are provided near opposite ends (1a, 1b) of the storage box (1) and wherein the connecting elements (20) are arranged in casting grooves (11) at the face of the precast concrete parts (5).
6. Precast concrete part according to claim 5, characterised in that the connecting elements (20) are arranged evenly over the precast concrete part (5).
7. Precast concrete part according to claim 5 or 6, characterised in that the connecting elements (20) are arranged on the bottom of a casting groove (11) at the end face of the precast concrete part (5).
8. Combination of several connecting elements (20) which can be arranged at at least one end face of a precast concrete part (5), for joining precast concrete parts (5) by transverse force locking at a joint (10) with transverse forces parallel to the longitudinal direction of the joint, and comprise a preferably elongate storage box (1) and exactly two reinforcing loop elements which can be received in the storage box (1) and bent out of the latter, wherein the reinforcing loop elements (3) pass through the storage box (1) in each case in the region of a through-opening (1', 1") in the storage box (1), characterised in that the through-openings (1', 1") for the two reinforcing loop elements (3) are provided near opposite ends (1a, 1b) of the storage box (1).
9. Use of several connecting elements (20) which serve to join precast concrete parts (5) by transverse force locking at a joint (10) with transverse forces parallel to the longitudinal direction of the joint, and comprise a preferably elongate storage box (1) and exactly two reinforcing loop elements which can be received in the storage box (1) and bent out of the latter, wherein the reinforcing loop elements (3) pass through the storage box (1) in each case in the region of a through-opening (1', 1") in the storage box (1), characterised in that the through-openings (1', 1") for the two reinforcing loop elements (3) are provided near opposite ends (1a, 1b) of the storage box (1), for arrangement at at least one end face of a precast concrete part (5).
10. Method, precast concrete part, combination or use according to any of the preceding claims, characterised in that the maximum distance between the through-openings (1', 1") which are close to the ends, from one end (1a, 1b) in the longitudinal direction of the storage box (1), is shorter than 0.5 times, preferably 0.25 times, particularly - preferably 0.1 times a loop length (1) by which the reinforcing loop elements (3) protrude from the storage box (1) in the bent-out state.
11. Method, precast concrete part, combination or use according to any of the preceding claims, characterised in that the length (L) of the storage box (1) is shorter than 2.5 times, preferably 1.5 times a loop length (1) by which the reinforcing loop elements (3) protrude from the storage box (1) in the bent-out state.
12. Method, precast concrete part, combination or use according to any of the preceding claims, characterised in that the at least two reinforcing loop elements (3) in the state received in the storage box (1) face towards each other and preferably at least partially overlap each other.
13. Method, precast concrete part, combination or use according to any of the preceding claims, characterised in that the bottom (1c) of the storage box is profiled in at least one section by projections and/or recesses (12), wherein the projections and/or recesses (12) are preferably provided adjacent to the through-openings (1', 1").

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