EP3315678B1 - Prefabricated element for connecting a concrete cantilever plate to a building structure - Google Patents

Description

TECHNICAL AREA

The invention relates to a prefabricated component for connecting a concrete cantilever as a balcony element to a concrete structure such as a building ceiling. The prefabricated component comprises a Dämmkörper for arrangement in a joint between the concrete cantilever and the concrete structure, as well as the insulating body and cross on both sides for embedding in the concrete cantilever and the concrete structure on this projecting tie rods, pressure bars and stiffening plates each made of steel. The tension rods and the pressure rods are connected in pairs via the stiffening plates.

STATE OF THE ART

A prefabricated component having the feature combination of the preamble of claim 1 is made EP2055845 A2 known. Through the insulating body, the concrete cantilever and the concrete component to reduce thermal bridges are thermally insulated from each other. The tensile, compressive and shear forces caused by the concrete cantilever are absorbed by the tension rods, the pressure rods and the stiffening plates. These are made of steel and so slim or thin that they on the one hand still absorb the effective forces, but on the other hand have no significant cross section for the heat conduction and also by deformation within the insulating body relative, caused by unequal heat changes length changes of concrete cantilever and concrete component can follow , On both sides of the insulating body cross bars are still performed by the stiffening plates for receiving and transmitting the forces caused by the concrete cantilever transverse forces in the known prefabricated component in addition.

Out DE 102013 111 091 A1 It is known to use for connecting an attachment shell with a support shell of wall components with their ends in the shell concrete embedded bolts and separately therefrom plate-shaped, at opposite plate edges also embedded in the shell concrete support elements each made of plastic. At the plate edges of the support elements two tooth-like projections are formed, can intervene between the reinforcing bars of an embedded in the tray reinforcing grid. In the direction of the plate normal, these projections are widened in relation to the plate thickness of predominantly 12 mm to improve the absorption of forces parallel to Board level in the connection direction. The bolts and the support elements are designed for wall elements whose front shell weighs only up to about a ton. For the connection, for example, a balcony slab, which can weigh up to 10 tons, they are not suitable.

PRESENTATION OF THE INVENTION

The invention is based on the recognition that cross bars for the installation of EP2055845 A2 familiar prefabricated often prove to be a hindrance, because they can potentially collide with the reinforcement of the concrete header and / or the concrete component. Also, they can be a hindrance to warehousing and transportation. The invention therefore has as its object, inter alia, to enable the reception and transmission of the transverse force caused by the concrete cantilever plate without the use of transverse rods in a prefabricated component of the type mentioned at the outset. The invention solves this problem by a prefabricated component according to claim 1. End faces of the stiffening plates of the inventive prefabricated component are aligned obliquely opposite the tension and / or the pressure bars. Due to the oblique design of the end surfaces, the transverse forces caused by the concrete cantilever can be absorbed and transmitted through these surfaces. The oblique faces take over the task of the cross bars in the prior art. By eliminating crossbars, the prefabricated component according to the invention fits better on the construction site between the reinforcements of the concrete cantilever and / or the concrete component and, if necessary, can also be exchanged more easily after a faulty assembly. To adjust the length of the finished component cuts in the soft insulating body suffice. The elimination of transverse bars, the units of interconnected tension and compression bars and stiffening plates are flat, ie practically two instead of three-dimensional. As a result, these units can be much more compact stack and transport.

Preferred embodiments and further developments of the invention are specified in the dependent claims.

Thereafter, the end faces of the stiffening plates are preferably provided with a plurality, in particular at least three prongs.

As in the prior art, the tension rods and the pressure rods are slim and the stiffening plates made thin, so that on the one hand no significant cross-section For the heat conduction and on the other hand by deformation within the insulating body relative, caused by unequal heat changes changes in length of concrete cantilever and concrete component can follow sufficiently. The respective dimensions depend on the dimension in particular of the cantilever. Within the insulating body, the stiffening plates are preferably made thinner than the tensile and / or the pressure bars. At their end faces, the stiffening plates are thicker than running inside the insulating body, for example, at least twice as thick, preferably even 2- to 5 times as thick. As a result of their enlarged area, transverse forces can be absorbed more effectively from the surrounding concrete or transferred to the latter via the oblique end faces.

The thickening of the stiffening plates at their end faces can be achieved simply by placing them thereon e.g. be brought by welding fastened bar made of steel.

It is sufficient if the stiffening plates on both sides over the insulating body at most 30 mm, survive. As a result, they only slightly engage in the concrete of the two concrete components. Preferably, the supernatant or the depth of engagement, measured at points to the tip, only 10 to 20 mm.

The insulating body can be designed in several parts with several Dämmblöcken and two outer cover layers. The Dämmblöcke come here between each two units of interconnected tension and compression bars and stiffening plates for arrangement.

In contrast, the outer cover layers extend continuously over all the insulating blocks and the units mentioned. The cover layers are preferably made of a harder and more fracture resistant material than the Dämmblöcke and thus give the prefabricated the required overall handling for its handling.

The Dämmblöcke, the units mentioned and the outer cover layers can be held together simply by guided around them bands. Since such bands are easy to install, the joining of the parts may possibly only after a storage or transport phase, in which case the compact stackability of said units is also advantageous.

The tension rods and the pressure rods can be the same thickness and / or the same length. In addition, it is preferred to form the prefabricated component symmetrically. This facilitates its installation and avoids installation errors due to incorrect orientation.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

perspektivisch ein Fertigbauteil in einem Einbauzustand;

Fig. 2

einen Querschnitt (A-A) durch das Fertigbauteil von Fig. 1;

Fig. 3

einen entsprechenden Querschnitt durch eine bevorzugte Ausführungsform eines erfindungsgemässen Fertigbauteils; und

Fig. 4

perspektivisch einen Stirnseitenabschnitt der Versteifungsplatte der Ausführungsform von Fig. 3.

Show it:

Fig. 1

in perspective, a prefabricated component in an installed state;

Fig. 2

a cross section (AA) through the prefabricated part of Fig. 1 ;

Fig. 3

a corresponding cross section through a preferred embodiment of a finished component according to the invention; and

Fig. 4

perspective view of a front side portion of the stiffening plate of the embodiment of Fig. 3 ,

Of several identical parts, only one is provided with a reference numeral in the figures.

WAYS FOR CARRYING OUT THE INVENTION

The prefabricated part of Fig. 1 is arranged in a joint between a dashed line indicated cantilever 1 made of concrete and also indicated by dashed lines concrete structure 2. The cantilever panel 1 may be a balcony slab and the concrete structure 2 may be a floor slab of a building.

The prefabricated component has an elongate insulating body 3, which is penetrated by upper tension rods 4 and lower pressure rods 5. In each case superposed Zug- 4 and push rods 5 are connected in pairs by stiffening plates 6, for example, by the tie rods 4 are welded respectively at the upper edge and the pressure bars respectively at the bottom of the stiffening plates 6. The tension rods 4 and the pressure rods run parallel to each other and parallel to the top and bottom at least the concrete cantilever 1. About the insulating body 3 they are on both sides, so that they are embedded with their ends in the concrete cantilever 1 and the concrete structure 2. The connecting plates 6 are also on both sides on the insulating body 3 and over thereby embedded with their end cuts also in the concrete header 1 and the concrete structure 2, albeit less deeply.

Like in the Fig. 2-4 can be seen, the embedded in the concrete cantilever 1 and the concrete structure 2 end surfaces 7 of the stiffening plates 6 obliquely against the train 4 and / or the pressure bars 5 are aligned. In the illustrated embodiment, this is achieved by the formation of the end faces 7 with four prongs each. Other oblique training as well as a different number of teeth are also possible. Due to the oblique design of the end faces 7, the transverse forces caused by the concrete cantilever 1 can be absorbed and transmitted through these surfaces.

The tension rods 3 and the pressure rods 4 are preferably made of rebar, so that their over the insulating body protruding ends can be sized by a sufficient anchorage in the concrete short, in most cases less than 50 cm long. For the stiffening plates 6, embedment depths are sufficient up to tips of the teeth of 10 to 30 mm.

The stiffening plates 6 are thinner inside the insulating body than the tension bars 4 and / or the pressure bars 5, wherein a thickness of 3 to 4 mm is suitable. The height of the stiffening plates 6 corresponds to the mutual distance of the train 4 and push rods 5, which in turn depends on the masses, in particular the concrete cantilever 1.

In order to effectively absorb and transmit said lateral forces, the stiffening plates 6 are thicker at their end faces 7, preferably 2 - 5 times as thick as inside the insulating body 3. This can be easily achieved by a respectively mounted on the end faces 7 bar made of steel as they are in FIG. 3 and FIG. 4 denoted by 8. The strip 8 may simply be welded onto the end faces 7. In Fig. 3 it is only schematically shown because of their better recognizability with some distance from the end faces 7.

Since the tension 4 and the pressure bars 5 and the stiffening plates 6 may be exposed to moisture in the region of the insulating body, they are there and at least within the Betonüberdeckungen the concrete top plate 1 and the concrete structure 2 made of a stainless steel.

In the illustrated embodiment of Fig. 1 the insulating body 3 is formed in several parts with several Dämmblöcken 3.1 and two outer cover layers 3.2 and 3.3, wherein the Dämmblöcke 3.1 are arranged between two units of interconnected train 4 and compression bars 5 and stiffening plates 6. The outer cover layers 3.2 and 3.3, in contrast, extend along the entire prefabricated part continuously over all the insulation blocks 3.1 and the said units 4, 5, 6 away. In a simple way, the said parts are held together by an outside around them stretched longitudinal belt 10 and by a plurality of transverse straps 11.

The Zug- 4 and the pressure bars 5 are in the illustrated embodiment of Fig. 1 the same thickness and the same length, so that the prefabricated component is largely symmetrical and can be installed both rotated about a longitudinal and a transverse axis.

NAME LIST

1

cantilever plate

2

concrete structure

3

insulating body

4

Tension rods

5

compression bars

6

stiffening plates

7

End faces of the stiffening plates

8th

strip

3.1

Insulating blocks

3.2

upper cover layer

3.3

lower cover layer

10

longitudinal ligament

11

transverse bands

Claims (12)

1. Prefabricated component for attaching a concrete cantilever slab (1) to a concrete structure (2), having:

   an insulating element (3) for arranging in a joint between the concrete cantilever slab (1) and the concrete structure (2),

   tension members (4), compression members (5) and reinforcing plates (6), each made of steel, that pass through the insulating element (3) and protrude from both sides thereof in order to be embedded in the concrete cantilever slab (1) and the concrete structure (2),

   wherein the tension members (4) and the compression members (5) are connected together in pairs via the reinforcing plates (6),

   the end faces (7) of the reinforcing plates (6) are oriented obliquely with respect to the tension members (4) and/or compression members (5), characterized in that the reinforcing plates (6) are thicker at their end faces (7) than within the insulating element (3).
2. Prefabricated component according to Claim 1, characterized in that the end faces (7) of the reinforcing plates (6) are provided with a plurality of points (8.1-8.4).
3. Prefabricated component according to Claim 1 or 2, characterized in that the reinforcing plates (6), at least within the insulating element, are thinner than the tension members (4) and/or compression members (5).
4. Prefabricated component according to Claim 1, characterized in that the reinforcing plates (6) are at least twice as thick, preferably 2-5 times as thick, at their end faces (7) than within the insulating element (3).
5. Prefabricated component according to Claim 1, characterized in that the reinforcing plates (6) are thicker at their end faces (7), on account of a steel strip (8) fastened thereto, than within the insulating element (3).
6. Prefabricated component according to Claim 5, characterized in that the reinforcing plates (6) and the strip (8) are welded together.
7. Prefabricated component according to one of Claims 1-6, characterized in that the reinforcing plates (6) protrude from both sides of the insulating element (3) by at most 30 mm, preferably 10 to 20 mm.
8. Prefabricated component according to one of Claims 1-7, characterized in that the insulating element (3) is embodied in a multipart manner with a plurality of insulating blocks (3.1) and two outer cover layers (3.2, 3.3), wherein the insulating blocks are arranged between in each case two units made up of connected-together tension members (4) and compression members (5) and reinforcing plates (6), and the outer cover layers (3.2, 3.3) extend continuously over all insulating blocks (3.1) and said units (4, 5, 6).
9. Prefabricated component according to Claim 8, characterized in that the outer cover layers (3.2, 3.3) consist of a harder and more fracture-resistant material than the insulating blocks (3.1).
10. Prefabricated component according to Claim 8, characterized in that the insulating blocks (3.1), said units and the outer cover layers (3.2, 3.3) are held together by bands.
11. Prefabricated component according to one of Claims 1 to 10, characterized in that the tension members (4) and compression members (5) are the same thickness and/or the same length.
12. Prefabricated component according to one of Claims 1 to 11, characterized in that it is formed in a symmetric manner.

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