WO1997044540A1

WO1997044540A1 - Connection element

Info

Publication number: WO1997044540A1
Application number: PCT/EP1997/002640
Authority: WO
Inventors: Günter BÖRSCH; Richard Moosmann; Felix SCHÄDLER
Original assignee: Aco Severin Ahlmann Gmbh & Co. Kg
Priority date: 1996-05-23
Filing date: 1997-05-22
Publication date: 1997-11-27
Also published as: DE29623634U1; DE29623633U1; EP0956401A1

Abstract

The invention concerns a connection element (1) for connecting a cantilever slab (2) to an internal concrete ceiling (4). A strut (8) is connected to a pressure element (14, 16, 18) via an obliquely disposed diagonal connection element (10).

Description

description

Fastener

The invention relates to a connecting element for connecting a cantilever plate to a wall or ceiling part according to the preamble of claim 1.

Such connecting elements are described for example in DE-OS 44 36 808. These connecting elements are used to connect cantilever slabs, such as balcony floor slabs, to an interior concrete ceiling. In order to improve the thermal insulation of the building, insulating material is introduced into a joint between the cantilever plate and the inner concrete ceiling, so that both components are largely thermodynamically decoupled. The tensile, compressive and shear forces (shear forces) which occur must be absorbed by one or more connecting elements which are usually arranged parallel to one another so that they extend through the parting line.

The connecting elements known before the filing date of the abovementioned patent application had a comparatively complicated structure which required considerable production engineering and logistical effort.

The connecting element described in DE-OS 44 36 808 has the advantage over conventional solutions that it can be produced as a locking part from sheet metal, with the test bars

REPLACEMENT BLADE (RULE 26) for example tension rods or distributor bars - can be subsequently attached to the connecting element, whereas in the previously known prior art they had to be attached during the manufacture of the connecting element.

When using the plate-shaped connecting elements, it was found that, in particular when supporting heavy cantilever plates, a large number of connecting elements had to be arranged at a comparatively small distance from one another in order to be able to absorb the forces occurring. The forces that can be transmitted by a single connecting element were essentially limited by the wall thickness of the plate material, so that a compromise had to be found between optimum strength on the one hand and minimal material expenditure on the other. Furthermore, it was found that due to the plate-like structure, a cold bridge between the cantilever plate and the inner concrete ceiling was created, which would have resulted in even greater heat losses if the wall thickness of the connecting element had been increased. In contrast, the invention has for its object to provide a connecting element with which sufficient strength can be achieved with minimal material. This object is achieved by the features of patent claim 1.

As a result of the measure of connecting the tension strut via a diagonal connection to a pressure element arranged at a distance from the tension strut, the material accumulation in the area connecting the tension strut to the pressure element can be reduced to a minimum. Due to the inclination of the diagonal connection, the lattice girder principle is transferred to the connecting element according to the invention, so that large tensile, compressive and shear forces can be transmitted from the cantilever plate to the inner concrete ceiling with a minimum of material.

It is very particularly advantageous if the diagonal connection is formed with two parallel legs arranged at a distance from one another, so that the material thickness of each individual leg can be minimized. Stands an improved support of the tension strut takes place, so that a tilting of the tension strut can be prevented.

In this variant, it is particularly preferred if the two parallel legs are formed by a U-part, the base of which is used to support the pressure element or elements.

The pressure elements used are preferably two pressure plates which are fastened to the two end faces of the U-shaped base part, the pressure plates advantageously being set up vertically in such a way that the extensions of their pressure surfaces converge towards the tension strut.

A particularly simple construction results if the cantilever plate-side pressure plate is angled towards the horizontal at its area adjacent to the tension strut, so that the shear forces can be absorbed through this angled area.

The lattice girder or truss principle is used particularly advantageously if the diagonal connection is inclined towards the cantilever plate-side pressure element. It is particularly preferred if the inclination and the length of the diagonal connection is selected such that the end section on the tension strut side ends in the inner concrete ceiling. An angle of inclination of approximately 50 '-60' has proven to be particularly suitable.

At each end section of the tension strut there are receptacles for fixing tensile reinforcements, which are received by the receptacles in a positive and / or non-positive manner. These tensile reinforcements can be tensile bars, glass fiber bundles, ropes (steel ropes) etc.

It is particularly advantageous if the tension struts are formed by two parallel struts, each parallel strut being assigned to one of the parallel legs of the diagonal connection.

SPARE BLADE (RULE 26) This two-part design of the diagonal connection and the tension strut provides a certain degree of transverse elasticity (parallel to the joint), which can be used to compensate for dimensional changes caused by temperature fluctuations, for example, without stresses being transferred to the concrete parts.

When pouring the inner concrete ceiling and / or the cantilever part, concrete can also flow into the interspaces, so that the connecting element is embeded excellently and the calculated force transmission is ensured. the connecting element is preferably made of stainless steel, so that even condensed water in the area of the parting line cannot lead to corrosion.

The use of clips can simplify and support the fixing of the tension bars (glass fiber bundles, ropes) at the end sections of the tension struts.

Further advantageous embodiments of the invention are the subject of the other subclaims.

A preferred embodiment of the invention is explained in more detail below with the aid of schematic drawings. Show it:

FIG. 1 shows a side view of a connecting element according to the invention;

Figure 2 shows a section along the line A-A in Figure 1;

Figure 3 is a bottom plan view of the left end portion of a tension strut of Figure 1; and

4 shows a section along the line B-B in FIG.

FIG. 1 schematically shows the installation position of a connecting element 1 according to the invention, with which a cantilever plate 2 is to be fastened to a wall or ceiling part, for example an interior concrete ceiling 4. For thermodynamic decoupling

_V ERSÄΓZBLÄΓΓ (RULE 26) a gap 6 is formed between the cantilever plate 2 and the inner concrete ceiling 4, which is usually filled with an insulation material (not shown).

The connecting element 1 has a parallel to the cantilever

/ Tension strut 8 or belts running on the interior concrete ceiling level, which is connected to a foot part 12 via a diagonal connection 10. Pressure / push plates 14, 16, 18, which are described in more detail below, are formed on the foot part and protrude into the inner concrete ceiling 4 or the cantilever plate 2.

At the end sections of the tension strut 8, receptacles 20 are formed for fastening tension irons 24. As indicated in FIG. 1, distributing bars 26 extending perpendicular to the plane of the drawing (FIG. 1) can be embedded in the cantilever slab 2 as well as in the interior concrete ceiling 4, via which forces perpendicular to the plane of the drawing can be transmitted and absorbed. As a result, all the supporting forces required to support the cantilever plate 2 can be transmitted to the inner concrete ceiling 4 by the interaction of the tension strut 8, the tension bars 24, the diagonal connection 10, the pressure / push plates 14, 16, 18 and optionally the distributor bars 26. The plane spanned by the tension strut 8 runs perpendicular to the plane defined by the diagonal connection 10.

As can be seen in particular from FIG. 4, the diagonal connection 10 is formed by two parallel legs 28, 30, which in the view according to FIG. 4 are the U-legs of a U-plate, the base of which forms the foot part 12. According to FIG. 1, the foot part 12 is widened in relation to the width of each parallel leg 28, 30 and extends approximately in the horizontal direction, ie parallel to the ceiling plane. The diagonal connection is set at approximately 50 ° with respect to the horizontal (FIG. 1), ie the axis of the tension strut 8 or the axis of the widened foot part 12. This inclined position, together with the foot part 12 and the tension strut 8, forms a truss or lattice girder element, by means of which considerable forces can be transmitted with minimal expenditure of material. As can further be seen from FIG. 1, the inclination of the diagonal connection 10 is selected such that this falls away from the tension strut 8 towards that end section of the foot part 12 which points towards the cantilever plate 2.

As can further be seen from FIGS. 1 and 4, the pressure plates 14, 16 and the push plate 18 are formed on the open end faces of the U-shaped foot part, the pressure plate 14 being fastened to the end section of the foot part 12 which is in the inner concrete ceiling protrudes while the pressure plate 16 and the push plate 18 are fastened to the other end section of the foot part 12, which plunges into the cantilever plate 2. According to Figure 4, the width of the pressure / push plates 14, 16 and 18 is chosen greater than the parallel distance between the two parallel legs 28, 30, so that the plates 14, 16, 18 protrude laterally and also downwards (view according to Figure 1).

The two pressure plates 14, 16 are set at an angle of approximately 70 ° to the horizontal (ceiling plane), while the push plate 18 is set at an angle of approximately 25 °. That is, the push plate 18 is inclined towards the horizontal with respect to the pressure plate 16.

In the exemplary embodiment shown, it is sufficient if the thrust plate 18 is only formed on the cantilever-side end section of the foot part 12. Furthermore, in the embodiment shown in FIG. 1, the

To form the pressure plate 16 and the push plate 18 in one piece from a sheet metal part which is angled at its upper end section in FIG. 1. Of course, however, the individual panels can also be designed as individual components. The connection of the plates 14, 16, 18 to the foot part 12 and / or the diagonal connection is advantageously carried out by welding.

The length (view according to FIG. 1) of the foot part 12 is always chosen such that the plates 14, 16 and 18 are completely embedded in the assigned inner concrete ceiling 4 or the 20 cantilever plate 2. As can be seen in particular from FIGS. 2 to 4, the tension strut 8 is formed by two parallel struts 32, 34 which are spaced apart from one another and which are produced from flat steel sections. In the embodiment shown, one of the parallel legs 28, 30 is connected to one of the parallel struts 32 or 34 - preferably by welding - so that the tension strut 8 is optimally supported in the horizontal direction. As already mentioned at the beginning, a receptacle 20, 22 is provided on each end section of the tension strut 8 or the parallel struts 32, 34 for fastening the tension irons 24.

In principle, these receptacles 20, 22 are to be designed in such a way that the pulling irons can be hung in after the connecting element has been positioned, so that pulling irons 24 and connecting element 1 can be stored and transported separately from one another. In principle, any type of bracket can be used, which ensures that the distributor bars and the train reinforcement are retrofitted and that there is a force-fit connection.

In the variant shown in FIGS. 1 to 4, the end sections of the tension strut 8 - or more precisely the two parallel struts 32, 34 - are angled downward (view according to FIG. 1). As can be seen from FIG. 3, which shows a view from below of the left end of the tension strut 8 in FIG. 1, a counter bearing 36 is fastened in the angled region of the tension strut 8, which has a U-shaped top view in the view according to FIG. The two free-standing legs of the counter-bearing 36 are fastened on the underside of the associated parallel legs 28 and 30, respectively. The circularly curved base of the counter bearing 36 extends the gap between the parallel struts 32, 34. The two end sections of the counter bearing 36 are adapted to the inclination of the angled end sections of the tension strut 8 and welded to them.

As can also be seen in particular from FIGS. 1 and 3, a support tab is attached to the base of the counter bearing 36. brought on which the towing bar 24 can be supported (see Figure 1).

According to FIGS. 3 and 4, the width of the thrust bearing 36 is selected to be somewhat less than the total width of the tension strut 8, so that the edge portions of the tension strut 8 projecting outward beyond the thrust bearing 36 serve as a retention portion for the tension iron 24. which limit an upward movement (in the view according to FIG. 1).

Clamping recesses 42 are formed in the angled end sections of the tension strut 8, each of which extends from the side edges of a parallel strut 32, 34 to the adjacent side wall of the counter bearing 36.

According to FIG. 3, the pulling irons used in the exemplary embodiment are U-shaped, the clear width and the radius of curvature of the U being selected such that the pulling iron 24 surrounds the outer circumferential wall of the counter bearing 36 and, in the installed state, the free legs of the pulling iron 24 Push through the clamping recesses 42.

By this measure, the pull iron 24 can be positively hooked into the receptacle 20 or 22, the pull iron through the support tab 40 and the adjacent edge portions of the

Parallel struts 32, 34 and the clamping recesses 42 in the vertical direction (view according to FIG. 1) and by the base of the counter bearing 36 in the horizontal direction (i.e. away from the tension strut 8) are secured in a form-fitting and / or non-positive manner. The fixing in the horizontal direction towards the diagonal connection 10 can be carried out by means of suitable plug-in clips (not shown) which are inserted at the position indicated by X in FIG. To fix the clips, either the gap between the two parallel struts 32, 34 or a separate recess in the tension strut 8 can be provided. The clips are designed in such a way that they snap audibly or tangibly into their locking position, in which the tensile reinforcements are fixed. A suitable construction can be used to center the tensile reinforcement when inserting the clip.

ERSATZBLATr (REGEL26) The pulling iron 24 is inserted by passing the base from below in the Z direction behind the support bracket 40 and then pushing it towards the base of the counter bearing 36. Following this, the two U-legs of the pulling iron 24 are bent slightly apart and moved upwards until they snap into the clamping recesses 42. The clip is then inserted so that the pulling iron 24 is positively fixed in its installation position.

According to FIG. 1, the cantilever-side counter bearing 36 has a greater overall height H than the ceiling-side counter-bearing, so that the cantilever-side pulling iron 24 is arranged at a greater distance from the tension strut 8 than the ceiling-side pulling iron 24 (right in FIG. 1). This geometry is necessary in order to ensure the concrete coverings prescribed by law, whereby it is required that the concrete cover is, for example, 3 cm on the cantilever plate side, while only 2 cm is required on the ceiling side.

In the delivery state, a plurality of connecting elements 1 are arranged at a parallel distance from one another, these being embedded in an insulation body, for example made of polystyrene. This insulation body has the width of the parting line 6 and is equipped such that the pressure plates 14, 16 and the push plate 18 as well as the upper end section (FIG. 1) of the diagonal connection 10 and the end sections of the tension strut 8 protrude from the polystyrene block.

The connecting body (polystyrene block and a plurality of connecting elements arranged in parallel spacing from one another) is then positioned in the separation joint 6 provided, then hooked into the pulling iron 24 and then the distributor iron 26 is arranged in the cantilever plate area and in the ceiling area.

After pouring with concrete, a composite body is formed in which the connecting elements 1 are shown in FIG. 1

REPLACEMENT BLAΓΓ (RULE 26) Are embedded in the cantilever plate 2, the parting line 6 and the inner concrete ceiling 4.

Due to the weight F of the cantilever plate 2, this composite body is subjected to tension in the area of the parting line in the upper section (FIG. 1), these tensile forces being absorbed by the tension struts 8. The pressure forces acting in the lower region of the cantilever plate are transmitted to the inner concrete ceiling via the pressure plate 16 and the U-shaped foot part 12 and the pressure plate 14. The thrust or shear forces that occur

(Arrow Q in FIG. 1) are introduced into the connecting element via the push plate 18. The diagonal connection 10 ensures that the occurring forces are ideally introduced into the foot part 12 by the tension strut 8, the ideal line of force being supported by the inclined position of the diagonal connection 10 and the parallel spacing of the two parallel legs 28, 30.

Due to the parallel spacing of the parallel legs 28, 30 and the two parallel struts 32, 34, the concrete can enter into the gaps between these components 20 and into the base part 12 during pouring, so that secure anchoring is ensured. The support of the pressure and tension plates 14, 16 and 18 is also optimally ensured by the protruding edge sections and the associated undercuts.

The solution according to the invention creates a connecting element which enables a high-strength construction with minimal material expenditure. By minimizing the accumulation of material in the joint area, cold bridge formation is considerably reduced, so that the solution according to the invention is superior to conventional solutions from a thermodynamic point of view.

ERSATZBUπ (RULE 26)

Claims

Expectations

1. connecting element for connecting a cantilever plate (2) to a wall or ceiling part (4), can be fastened with a tension strut to the tension reinforcements (24), and with at least one pressure element (14) arranged at a distance from the tension strut (8) 16, 18), characterized in that the pressure element (14, 16, 18) is connected to the pressure element (14, 16, 18) via a diagonal connection (10) inclined relative to the tension strut 10 (8).

2. Connecting element according to claim 1, characterized in that the diagonal connection (10) has at least two parallel legs (28, 30).

3. Connecting element according to claim 2, characterized in that the parallel legs (28, 30) are legs of a U-part, the - preferably widened - base is a foot part (12) for supporting the pressure element (14, 16, 18) .

4. Connecting element according to claim 3, characterized gekenn¬ characterized in that the pressure element has two pressure plates (14, 16) which are arranged on the two end faces of the foot part (12), one pressure plate the cantilever part (2) and the other Pressure plate is assigned to the wall part (4).

Connecting element according to claim 4, characterized gekenn¬ characterized in that the pressure plates (14, 16) are inclined so that their pressure receiving surfaces are inclined towards the tension strut (8).

Connecting element according to one of claims 3 to 5, characterized in that the foot part (12) carries a thrust plate (18) for absorbing the thrust forces.

SPARE BLADES (RULE 26) 7. Connecting element according to claim 6, characterized gekenn¬ characterized in that the thrust plate (18) is integrally formed with the cantilever-side pressure plate (16), wherein the end section adjacent to the tension strut is angled towards the diagonal connection (10).

8. Connecting element according to one of the preceding claims, characterized in that the inclination of the diagonal connection (10) towards the cantilever-side pressure plate (16) is decreasing, the angle of inclination preferably being chosen such that in the installed state the end section on the foot part side the diagonal connection (10) are in a parting line (6) and the tension-strut-side end section in the wall part (4).

9. Connecting element according to claim 8, characterized gekenn¬ characterized in that the angle of inclination is approximately 40 ° -70 °, preferably 50 ° -60 °.

10. Connecting element according to one of the preceding claims, characterized in that the tension strut (8) has at least two parallel struts (32, 34), on the end sections of which brackets (20, 22) for the tension reinforcements (24) are arranged.

11. Connecting element according to one of the preceding claims, characterized in that the tension strut (8) has holders with U-shaped receptacles (20, 22) for the base of U-tension reinforcements (24), the inside width of which is less than the width of angled end sections of the tension strut (8), clamping recesses (42) being provided in these end sections, into which the legs of the tension reinforcements (24) can be brought into engagement.

12. Connecting element according to claim 10 or 11, characterized in that the receptacle (20) on the cantilever side end portion of the tension strut (8) with respect to the tension strut (8) is lower than the receptacle (22) on the wall part end section of the tension strut (8).

13. Connecting element according to one of the claims 10 to 12, characterized in that on each parallel strut

(32, 34) a parallel leg (28, 30) of the diagonal connection (10) opens.

14. Connecting element according to one of the preceding claims, characterized in that the components are made of stainless steel.

15. Connecting element according to one of the preceding claims, characterized in that the tension strut (8) has devices for fastening clips through which the tension reinforcements (24) can be fixed.

ERSÄΓZBLÄΠ (RULE 26)