EP3023555B1 - Device for connection for shear force connection and uses of same - Google Patents

Description

TECHNICAL AREA

The invention relates to a device for transverse force connection of a plate-shaped component made of reinforced concrete with a second component, comprising an element sleeve and a transverse mandrel, wherein the element sleeve is formed for flush mounting in the concrete of the plate-shaped member and consists of a pressure-resistant material, and wherein the transverse force Don from the outside into the element sleeve is inserted.

The plate-shaped component made of reinforced concrete may in particular be a pedestal or a flight of stairs and the second component may be a supporting component such as a staircase wall. However, such devices are also used on exterior building walls for arcades and balconies as a loggia. It could with the inventive device, two plate-shaped components made of reinforced concrete as two ceilings are connected to each other, for example, as an expansion joint connection.

The invention also relates to uses of such a device.

STATE OF THE ART

Devices for transverse force connection of this type are known and are used in particular for supporting plate-shaped components such as pedestals or staircases in supporting components such as a staircase wall. The transverse force caused by the weight of the plate-shaped component is thereby transferred into the supporting component by the transverse force mandrel inserted into the element sleeve with one end. On the side of the supporting component is often a box made of a resilient material in which the shear force mandrel is superimposed, whereby a footfall sound decoupling of the plate-shaped member is achieved with respect to the supporting member. The transverse force mandrel is, for example, a square tube made of stainless steel.

Under the effect of the shear force, the shear force mandrel presses against the top of the element sleeve, which passes the pressure to the concrete material. As a result, tensile stresses develop in the concrete material of the plate-shaped component, which must be absorbed by the reinforcement of the plate-shaped component. Until the reinforcement takes over these tensions, cracks form in the concrete, usually starting from the element sleeve in its near-edge area. If moisture penetrates through these cracks up to the reinforcement of the plate-shaped component, corrosion damage to the reinforcement occurs. The cracks are therefore only tolerated within the scope of the so-called serviceability of the plate-shaped component, as their width does not exceed a certain extent. In the interior of buildings this measure is 0.4 mm and 0.3 mm outside.

Cracking is all the more pronounced and critical, the thinner the plate-shaped component and thus the concrete layer above the element sleeve. Of course, the strength of the reinforcement also plays a role.

DE 196 02 306 A1 discloses the features of the preamble of claim 1.

PRESENTATION OF THE INVENTION

It is an object of the invention to provide a device for transverse force connection of the type mentioned, with which the mentioned cracking is at least less pronounced. Also comparatively thin concrete slabs can be safely used without a disproportionately dimensioned reinforcement. This object is achieved by a device having the features of claim 1. In the case of the device according to the invention, the inner cross section of the element sleeve along the outer section towards the side from which the expected transverse force acts is therefore wider than the inner cross section along the inner section. The shear force mandrel engages accurately in the inner portion, wherein the length of the inner portion (b) and the length of the outer portion of the length of the element sleeve (30) together.

Due to the extension of the inner cross section of the element sleeve along the outer section to the side from which the expected transverse force acts, in relation to its inner cross section along the inner section, the lateral force mandrel can (with side-correct installation of the element sleeve) under the action of the transverse force in the region of the outer portion of the sleeve element and thus in the near-edge zone of the plate-shaped component something bend without it thereby comes to the mentioned tensile stresses. At least the tensile stresses can be reduced by the measure according to the invention to such an extent that the formation of cracks remains within the range accepted for serviceability. In the region of the inner portion of the sleeve element and thus deeper inside the plate-shaped member, the bending of the shear force mandrel is firstly less and second less critical, because there more "material" counteracts the tensile forces occurring.

The inner cross section of the element sleeve could be extended along its outer portion instead of only one side even after several, in particular opposite or in all directions towards its inner cross section along its inner portion. In this case, the advantages associated with the invention can also be used in plate-shaped components that are subject to load direction changes. On the other hand, installation errors can thereby be reduced or even avoided by installation which is oriented incorrectly with respect to the direction of the expected transverse force. The transverse force mandrel can be solid or tubular and, in cross section, in particular rectangular / square or oval / round. A cross-sectionally oval or round element sleeve can be widened in its outer portion, for example, funnel-shaped in all directions. If the shear force mandrel comprises a plurality of tubular partial transverse force mandrels which can be inserted side by side into the element sleeve, a more favorable load distribution results in the plate-shaped component and thereby a higher serviceability, even if the partial transverse force mandrels each have a smaller wall thickness than with a single transverse mandrel same outer contour is in use.

In the dependent claims advantageous and therefore preferred embodiments of the inventive device are given.

Thus, the inner cross section of the element sleeve along its outer portion relative to the inner cross section along its inner portion can be extended with the same outer cross section by reducing a wall thickness.

The inner cross section of the element sleeve can be reduced along its inner portion relative to the inner cross section along its outer portion on the other hand, or additionally by at least one insert of pressure-resistant material.

Another possibility of expanding the inner cross section of the element sleeve along its outer portion relative to the inner cross section along its inner portion can be achieved with the same wall thickness by a deflection and / or by a displacement of a sleeve wall.

The inner cross-section of the element sleeve should be at the end of its outer portion after the mentioned side by 1 - 3 mm, preferably by about 2 mm, further dimensioned as the inner cross section along its inner portion.

On the front side of its outer edge, the element sleeve can be provided with mounting surfaces for attachment to a formwork. This can be done by sliding a cuff provided with such mounting surfaces or by attaching angles.

The transverse force mandrel may comprise a plurality of tubular partial transverse force mandrels which can be inserted next to one another into the element sleeve.

When using a plurality of partial transverse force mandrels, it is advantageous if the element sleeve and the partial transverse force mandrels each have a rectangular cross section. The element sleeve could also have an oval cross-section. In this case, two of the partial shear force dowels should have a D-shaped cross section.

While a single rectangular shear force mandrel of rectangular cross section with external dimensions of 60 mm x 60 mm or 40 mm x 60 mm typically has a wall thickness of at least 4 mm, it is sufficient for the partial transverse force mandrels of rectangular cross section with external dimensions of 60 mm x 30 mm or of 20 mm x 30 mm a wall thickness of 2.5 - 3.5 mm, in particular of about 3 mm.

In the device according to the invention, in order to reinforce it, in a contact-fitting manner with the element sleeve on the said side, towards which its inner cross section is widened along the outer section, there is still a traverse of a rear reinforcement in the form be provided a load portal. Although this reduces the deflection of the one or more transverse mandrels, forces can still be introduced into the concrete of the plate-shaped component in its upper area near the edge via the crossbar. In order to avoid cracking caused thereby, it is further provided in the context of the invention to provide the traverse on its side facing away from the element sleeve side with a padding.

Another object of the invention is to provide uses of the device according to the invention.

In such a use according to claim 10, an inventive element sleeve is installed with its side facing the male transverse force facing into the plate-shaped component. The length of its outer portion is measured according to the thickness of the edge concrete cover of the reinforcement of the component.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

im Schnitt (I-I in Fig. 2) eine Querkraftverbindung zwischen einem plattenförmigen Bauteil und einem tragenden Bauteil unter Verwendung einer Vorrichtung nach dem Stand der Technik sowie einer Trittschallbox;

Fig. 2

in einem Teilschnitt (II-II in Fig. 1) das plattenförmige Bauteil von Fig. 1;

Fig. 3

im Schnitt (entsprechend I-I) in einem plattenförmigen Bauteil eine Vorrichtung zur Querkraftverbindung mit einer Elementhülse gemäss einer ersten Ausführungsform der Erfindung;

Fig. 4

eine Ausschnittsvergrösserung des Bereichs A von Fig. 3;

Fig. 5

im Schnitt (entsprechend I-I) eine Elementhülse mit eingeschobenem Querkraftdorn gemäss einer zweiten Ausführungsform der Erfindung;

Fig. 6

im Schnitt (entsprechend I-I) eine Elementhülse mit eingeschobenem Querkraftdorn gemäss einer dritten Ausführungsform der Erfindung;

Fig. 7

in einem Teilschnitt (III-II in Fig. 6) die Elementhülse und der Querkraftdorn von Fig. 6;

Fig. 8

im Schnitt (IV-II in Fig. 9) in einem plattenförmigen Bauteil beispielsweise für eine Querkraftverbindung mit einer Elementhülse mit eingeschobenem Querkraftdorn gemäss der ersten Ausführungsform der Erfindung und wobei die Bewehrung des Bauteils kontaktschlüssig auf der Elementhülse eine Traverse einer Rückhängebewehrung aufweist;

Fig. 9

im Schnitt (V-V in Fig. 8) die Anordnung von Fig. 9;

Fig.10

in einem Teilschnitt (entsprechend Fig. 1) ein plattenförmiges Bauteil mit eingebauter Elementhülse gemäss Fig. 3 und wobei der Querkraftdorn aus zwei rohrförmigen Teil-Querkraftdornen mit rechteckigem Querschnitt besteht; und

Fig. 11

in einem Teilschnitt (entsprechend Fig. 10) ein plattenförmiges Bauteil mit eingebauter, im Querschnitt ovaler Elementhülse und wobei der Querkraftdorn aus zwei. im Querschnitt D-förmigen Teil-Querkraftdornen besteht.

Show it:

Fig. 1

in section (II in Fig. 2 ) a lateral force connection between a plate-shaped component and a supporting component using a device according to the prior art and a footfall sound box;

Fig. 2

in a partial section (II-II in Fig. 1 ) the plate-shaped component of Fig. 1 ;

Fig. 3

in section (corresponding to II) in a plate-shaped component, a device for transverse force connection with an element sleeve according to a first embodiment of the invention;

Fig. 4

a section enlargement of the area A of Fig. 3 ;

Fig. 5

in section (corresponding to II) an element sleeve with inserted shear force mandrel according to a second embodiment of the invention;

Fig. 6

in section (corresponding to II) an element sleeve with inserted shear force mandrel according to a third embodiment of the invention;

Fig. 7

in a partial section (III-II in Fig. 6 ) the element sleeve and the lateral force mandrel of Fig. 6 ;

Fig. 8

in section (IV-II in Fig. 9 ) in a plate-shaped component, for example, for a transverse force connection with an element sleeve with inserted shear force mandrel according to the first embodiment of the invention and wherein the reinforcement of the component has a cross-link of a back-up reinforcement in a contact-tight manner on the element sleeve;

Fig. 9

on average (VV in Fig. 8 ) the arrangement of Fig. 9 ;

Figure 10

in a partial section (corresponding Fig. 1 ) a plate-shaped component with built-in sleeve element according Fig. 3 and wherein the transverse force mandrel consists of two tubular partial transverse force mandrels with a rectangular cross section; and

Fig. 11

in a partial section (corresponding Fig. 10 ) a plate-shaped component with built-in, oval in cross-section element sleeve and wherein the transverse force mandrel of two. in cross-section D-shaped partial transverse force mandrels exists.

WAYS FOR CARRYING OUT THE INVENTION

Fig. 1 shows a transverse force connection between a plate-shaped member 10 and a supporting member 20 using an element sleeve 30 with Reckeckigem cross-section according to the prior art, a transverse force mandrel 40 in the form of a fit into the element sleeve 30 with an end portion square tube. Of the two components 10, 20 only parts are shown around the transverse force connection around. The component 10 could be a staircase or a reinforced concrete platform. A bow-shaped reinforcing bar of the reinforcement is denoted by 11. The component 20 could be a masonry or also concreted stairwell wall. The element sleeve 30 is made of a pressure-resistant plastic material and is embedded in the concrete of the component 10 flush with the component 20 opposite. A pushed onto the element sleeve 30 cuff 31 with a frontally encircling mounting surface 32 was used in the manufacture of the component 10 for its attachment to the formwork.

The lateral force connection according to Fig. 1 is designed for impact sound decoupling of the two components 10 and 20. For this purpose, a so-called impact sound box 50 is embedded in the component 20 in alignment with the element sleeve 30 of a soft elastic, sound-insulating material, in which the transverse force mandrel 40 engages with its other end portion. There is still an elastomeric bearing 51 for Auflagerung the transverse force mandrel 40 is present. The component 10 could be connected in the same way at other locations with correspondingly formed transverse force connections to the component 20 or other supporting components such as other adjacent stairwell walls. In the bridged by the transverse force mandrel 30 gap between the two components 10 and 20, an insulating material (not shown) may be present. The impact sound box 50 also has heat-insulating properties, which is advantageous when the component 10 is a cold exterior component and the component 20 is a warm interior component. If no footfall sound insulation is required, an element sleeve as in component 10 could likewise be used in component 20.

With its weight, the component 10 causes a transverse force Q, which is transmitted to the component 20 via the transverse force mandrels 40. Under the effect of the transverse force Q, cracking in the concrete can occur in the component 10, in particular above the element sleeve 30, as a result of a deflection of the transverse force mandrel 40, as shown in FIG Fig. 2 is indicated. One of the cracks is in Fig. 1 and Fig. 2 each indicated at 12. Moisture could enter the component 10 and cause corrosion of the reinforcement 11 due to the cracks. Nevertheless, such cracks are tolerated if their width does not exceed a certain amount. The limits for the serviceability of the concrete component 10 are 0.3 mm in the outside area and 0.4 mm in the inside area.

The tendency for cracking depends, among other things, on the weight of the component 10 and the strength of the reinforcement 11. Increasing the reinforcement, the weight increases, so that may not be gained much. A reinforcement of the reinforcement is also associated with more costs. On the other hand, the weight could be achieve a reduction in the component thickness d1, but at the expense of the serviceability of the component 10 and the cracking also favors.

The invention counteracts the formation of cracks by dimensioning the inner cross section of the element sleeve 30 along an outer portion a to one side further than the inner cross section along its complementary inner portion b. When installed, this extension is towards side, from which the lateral force Q acts, mostly and in Fig. 3 with it upwards.

In Fig. 3 the cross-sectional widening in section a is achieved by a reduction of the wall thickness of the upper wall of the element sleeve in the form of a chamfer 33. In the section enlargement A, this is in Fig. 4 clearly visible. Due to the cross-sectional widening, the transverse force mandrel 40 in the element sleeve 30 can bend somewhat upward, as indicated by dashed lines, without exerting pressure on the concrete material lying in the section a. The tendency for cracking in this area is thereby at least significantly reduced.

Like this in Fig. 3 can be seen, the length of the outer portion a is dimensioned approximately corresponding to the thickness d4 of the front concrete cover of the reinforcement 11 of the component 10, which generally corresponds to the preferred design of this length.

The cross-sectional widening need not be increasingly formed from the inside to the outside. A tiered extension would also be possible. A stepped expansion results, for example, by an insert 34 made of pressure-resistant material such as this Fig. 5 shows. Here, the insert 34 is designed in the form of a concentric to the element sleeve 30 and the transverse mandrel 40 concentric square tube, which in the element sleeve 30, apart from the longitudinal direction perhaps apart, does not need to be extra attached. The cross-sectional constriction, which is thus not only caused above but on all sides in the inner section, has the advantage that the element sleeve 30 can not be installed in the wrong direction by mistake. In the embodiment of Fig. 3 this could also be ensured by all-round chamfers, or at least on opposite sides.

The element sleeves 30 described so far, including the possibly existing collar 31 may consist of a pressure-resistant plastic material. In a rectangular Cross-section is their width, for example, about 60 mm, their height about 40 mm and their length about 200 mm. A use lying on edge would also be possible. Along its inner portion b is their wall thickness d2 on all sides, for example, about 4 mm. In the outer section a, this wall thickness is reduced at least on one side by 1 to 3 mm, preferably by approximately 2 mm. Accordingly, the remaining wall thickness d2 'at a bevel on the end face of the element sleeve 30 would be only 1 - 3 mm.

The 6 and 7 show an embodiment in which the element sleeve 30 has a square cross-section of, for example, 60 mm x 60 mm. Their length is eg 250 mm. They are made of a stainless steel sheet with a wall thickness d2 of only about 2 mm. Since a reduction of this small wall thickness is not well possible, at least one wall in the outer portion a at the same wall thickness as in the inner portion is extended by a deflection 35. At the back is the element sleeve of Fig. 6 closed with a plastic cap 36. Like this Fig. 7 shows, laterally on the element sleeve 30 mounting surfaces in the form of welding technology adhered angles 37 for attachment to a formwork available.

The FIGS. 8 and 9 show device according to the invention with an element sleeve 30 according to Fig. 3 and a transverse force mandrel 40 installed in a plate-shaped component 10, wherein the reinforcement of the component 10 has a contact with the element sleeve 30 on its upper wall cross-member 13 a back-up reinforcement. The traverse 13 is a solid square piece of metal, which is welded at its ends with upwardly bent end portions of reinforcing bars 14, which extend, moreover, in the lower region of the plate-shaped member 10 parallel to the underside thereof. The traverse 13, which is anchored downwards in this way and acts as a load portal, helps to limit the deflection of the transverse force mandrel 40 absolutely and essentially to the area of the concrete cover or the outer section a of the element sleeve 30 under the effect of the transverse force Q. As far as it comes to deformations and the introduction of stresses in the concrete on the cross member 13 in the upper region of the plate-shaped member 10, these can be reduced by attaching a padding 15 on the cross member 13. The padding 15 absorbs the deformations, so that there is no pressure on the overlying concrete material can. If, in the component 10 by alternating payloads or an unfavorable arrangement of several transverse force connections also abhebende shear forces can occur, load portals as shown with a Trage Padded Traverse 13 can be provided on both sides above and below the element sleeve 30. In this case, an extension of the element sleeve 30 should also be present along its outer portion a, both above and below.

Fig. 10 shows a variant of the invention, in which instead of only one transverse force mandrel 40, as at least in the Figures 2 . 7 and 9 the case is, two tubular partial transverse force mandrels 41 and 42 are inserted side by side in an element sleeve 30. Both the element sleeve 30 and the two partial transverse force mandrels 41 and 42 have a rectangular shape and are adapted to each other so that the partial transverse force mandrels 41 and 42 are in planar contact with each other and with the inner wall of the element sleeve 30. The latter applies at least to the inner portion of the element sleeve 30, since it is again provided here in its outer portion with a certain cross-sectional widening by a chamfer 33. In the context of the present variant, however, a cross-sectional expansion could also be dispensed with. The partial transverse force mandrels 41, 42 need not be connected to each other.

Even if the wall thickness d3 of the two partial lateral force dowels of Fig. 10 as shown in each case is less than, for example, the wall thickness d3 of the individual transverse force mandrel 40 of Fig. 2 , results in the two partial transverse force mandrels 41 and 42 under otherwise identical conditions, another crack pattern with less cracking. In comparison with a single shear force mandrel with 4 mm wall thickness could in tests the usability of a plate-shaped member 10 with two partial shear force dowels accordingly Fig. 10 and be doubled with only 3 mm wall thickness. The result of the two partial transverse force mandrels, not present in a single tubular shear force mandrel, double web is likely to have this impacted above all.

In principle, more than just two partial shear mandrels could be used. The shape of the partial transverse force mandrels or the element sleeve could also be square. Fig. 11 shows as another option an oval element sleeve 30 with two inserted therein D-shaped partial transverse force mandrels 41 and 42. Between them, at least one further, approximately rectangular partial transverse force mandrel could be inserted. The oval shape encloses the circular shape as a special case. As in the 10 and 11 As shown, it is preferable to arrange the sub-lateral force mandrels side by side with respect to the direction of the lateral force Q.

LIST OF REFERENCE NUMBERS

10

plate-shaped component

11

reinforcement

12

cracks

13

traverse

14

rebar

15

upholstery

20

carrying component

30

element sleeve

31

cuff

32

mounting surface

33

bevel

34

inlay

35

deflection

36

Plastic cap

37

corner

40

Shear Dowel

41

Part-Shear Dowel

42

Part-Shear Dowel

50

Trittschallbox

51

elastomeric bearings

Q

lateral force

a

outer section of the element sleeve

b

inner section of the element sleeve

A

detail enlargement

d2

Thickness of the front concrete cover of the reinforcement

d2

Wall thickness of the element sleeve along section b

d2 '

remaining wall thickness

d3

Wall thickness of the lateral mandrel / s / e

d4

Concrete cover

Claims (11)

1. Device for the shear force connection of a slab-shaped component (10) of reinforced concrete to a second component (20), comprising an element sleeve (30) and a shear force dowel (40; 41, 42), wherein the element sleeve (30) is designed to be embedded edge-flush into the concrete of the slab-shaped component (10) and consists of a pressure-resistant material, and wherein the shear force dowel (40; 41, 42) can be inserted into the element sleeve (30) from outside, characterized in that the inner cross section of the element sleeve (30) along an outer portion (a) at least towards the side from which the shear force to be expected acts is wider than the inner cross section along an inner portion (b), and the shear force dowel engages with a precise fit in the inner portion (b), wherein the length of the inner portion (b) and the length of the outer portion (a) together form the length of the element sleeve (30).
2. Device according to claim 1, characterized in that the inner cross section of the element sleeve (30) along its outer portion (a) is widened with respect to the inner cross section along its inner portion (b) for the same outer cross section by reduction of a wall thickness (d2).
3. Device according to claim 1 or 2, characterized in that the inner cross section of the element sleeve (30) along its inner portion (b) is reduced with respect to the inner cross section along its outer portion (a) by means of at least one insert (34) of pressure-resistant material.
4. Device according to one of claims 1-3, characterized in that the inner cross section of the element sleeve (30) along its outer portion (a) is widened outwardly with respect to the inner cross section along its inner portion (b) for the same thickness (d2) by an outward bend (35) and/or by an offset of a sleeve wall.
5. Device according to one of claims 1-4, characterized in that the inner cross section of the element sleeve at the end side of its outer portion (a) is wider by 1-3 mm, preferably approximately 2 mm, towards the aforementioned side than the inner cross section along its inner portion (b).
6. Device according to one of claims 1-5, characterized in that the element sleeve (30) is provided at the end side of its outer edge with mounting surfaces (32; 37) for fastening to a formwork.
7. Device according to one of claims 1-6, characterized in that the shear force dowel comprises a plurality of tubular shear force partial dowels (41, 42) which can be inserted next to one another into the element sleeve (30).
8. Device according to claim 7, characterized in that the element sleeve (30) and the shear force partial dowels (41, 42) each have a rectangular cross section, or in that the element sleeve (30) has an oval cross section and two of the shear force partial dowels (41, 42) each have a D-shaped cross section.
9. Device according to one of claims 7-8, characterized in that the shear force partial dowels (41, 42) have a wall thickness (d3) of 2.5-3.5 mm, preferably of approximately 3 mm.
10. Device according to one of claims 1-9, characterized in that it comprises a crossmember (13) of a rear-suspended reinforcement which is in contact-fitting engagement with the element sleeve (30) on the said side and which is provided with a padding (15) on this side.
11. Use of a device according to one of claims 1-10 for the shear force connection of a slab-shaped component (10) of reinforced concrete, such as a landing or a flight of stairs, to a supporting component (20), such as a staircase wall, wherein the element sleeve (30), with its said side directed towards the shear force (Q) to be received, is installed edge-flush in the slab-shaped component (10), characterized in that the length of its outer portion (a) is dimensioned to correspond to the thickness (d4) of the marginal concrete covering of the reinforcement (11; 13, 14) of the slab-shaped component (10).

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