DE102007060956A1 - Bolt for attaching stone cladding slabs to concrete slabs passes through washer on joint side of concrete slab which transfers force to disk with W-shaped cross-section mounted in recess in cladding - Google Patents

Abstract

The bolt (2) for attaching stone cladding slabs (6) to concrete slabs (7) passes through a washer (10) on the joint side of the concrete slab which transfers force to a disk (4) with a W-shaped cross-section mounted in a recess (3) in the cladding.

Description

The The invention relates to an expansion anchor for connecting a stone slab with a concrete slab having the features of the preamble of the claim 1.

It is known, facades of buildings of aesthetic Grounds with stone slabs to disguise. For stiffening the flagstones can be connected with concrete slabs, which serve as a carrier for the stone slabs.

The patent EP 663 492 B1 discloses an expansion anchor for this purpose. For anchoring in a blind hole in the stone slab, the known expansion anchor on an expandable element which is spread open by pushing on a widening spreader and thereby anchored the expansion anchor in the stone slab. The expansion body of the known expansion anchor is, as usual, an expansion cone, ie frusto-conical; However, other forms of the expansion body are conceivable and possible, such as, for example, a pyramid-shaped or a wedge-shaped expansion body.

By the sliding of the expandable element on the expanding Expansion body, the expandable element is widened, what is called spreading. By spreading the expandable Elements, the expansion anchor is anchored in a hole in the stone slab. Instead of the expandable element on the spreader postpone, can also be the spreader in the spreadable Element be retracted, which also as pushing the expandable View elements on the spreader in the context of the invention is.

One from the stone plate protruding part of the expansion anchor is in the Concrete plate anchored, which, for example, by casting with concrete, which is then possible to the concrete slab cures. Also is a pouring out of a borehole in a concrete slab, so a chemical anchoring of the stone slab protruding expansion anchor in the concrete slab or another Anchoring possible.

To the Compensation of shrinkage during curing of the concrete and / or of different temperature expansions of the flagstone and the concrete slab is a relative mobility between the stone slab and the concrete slab required. In the known expansion anchor this is movable or Slidability of the stone slab with respect to the concrete slab, the relative to the expansion anchor a transverse or a radial movement is achieved by a plastic sleeve, which is the expansion anchor in the area of the transition from the stone slab to the concrete slab surrounds and extends both a bit into the stone slab as well as a piece in the concrete slab extends. The plastic sleeve the known expansion anchor can only after pushing the expandable Elements on the spreader, so after spreading of the expandable element and thus after the anchoring of the expansion anchor be mounted in the stone plate on the expansion anchor.

task The invention is an expansion anchor of the above To propose way of facing a displacement of a stone slab a concrete slab to which the stone slab is connected, allows without after anchoring the expansion anchor in the stone slab a cover at the transition from the concrete slab to the stone slab must be placed on the expansion anchor.

These The object is achieved by the features of claim 1. The inventive Expansible anchor has a force-transmitting element, with a force for pushing the expandable element on the spreader transferable is. The force required for spreading can thus with the force-transmitting Element to be transferred to the expandable element. The force transmitting element is in the power transmission direction stiffer than across. The power transmission direction is those for pushing the expandable element onto the expansion body, So for spreading, is required. In this direction is one highest possible stiffness of the force-transmitting To strive for elements. Across this, the stone slab must face the concrete slab to be displaceable, due to the lower rigidity of the force-transmitting element in this direction or is reached in these directions. Transverse to the power transmission direction the expandable element can be elastically and / or plastically deformable. The force-transmitting element of the invention Expansion anchor can be a sleeve as in the known expansion anchor, However, it has a (considerably) greater rigidity in the power transmission direction, ie in the longitudinal direction or axial direction of the sleeve as transverse or radial. The invention has the advantage that the expandable element with the force-transmitting element pushed onto the spreader and thus expandable and the force-transmitting element not removed after spreading and by an elastic Element must be replaced, but the required displacement allows the stone slab opposite the concrete slab.

In a preferred embodiment of the invention, the expansion anchor is an undercut anchor which is positively anchored by spreading the expandable element in an undercut hole in the stone slab. An additional adhesion in the flagstone does not exclude the invention. Also is basically an exclusively force conclusive anchoring in a non-undercut borehole not excluded from the invention. An undercut anchor has the advantage of positive locking.

A Embodiment of the invention provides that the expansion anchor a Spreader having a shaft. The shaft can be integral with the spreader. It is also a connection of the shaft with the spreader, for example a screw connection, possible. The force-transmitting element has a through hole which is penetrated by the shank of the expansion anchor becomes. The force transmitting element is on the shaft displaceable. It can rub against the shaft. An example of one such force-transmitting element is the already mentioned Sleeve.

A Embodiment of the invention provides a cylindrical envelope surface of the force-transmitting element. The force-transmitting Element is characterized by a cylindrical hole in the stone slab customized. "Envelope" does not mean mandatory a continuous cylindrical surface, but can the peripheral surface of the force-transmitting element Have recesses. However, the invention concludes a force-transmitting element with a cylindrical lateral surface not from.

The greater rigidity of the force-transmitting Elements in the power transmission direction as transverse to it For example, a material with inhomogeneous material properties, namely a material which is stiffer in one direction be reached across to it. An embodiment of the invention sees before, the different stiffnesses in the power transmission direction and across it by the shape of the force-transmitting element to realize. This can be the force-transmitting element Have recesses extending in the power transmission direction extend. It may have ribs and / or webs which extend in extend the power transmission direction. The force-transmitting element may have hollow chambers bounded by ribs and / or webs or, for example, ribs that are star-shaped, chordwise or spiral and in the power transmission direction of the force-transmitting element extend. This list is not exhaustive.

A Another embodiment of the invention provides a kind of reinforcement of the force-transmitting element in front of the larger Stiffness in the power transmission direction as transverse to it to effect. The force-transmitting element can do this for example, tubular stiffening element, for example have a steel tube which is surrounded by plastic. Thereby becomes a high rigidity in the longitudinal or axial direction achieved by the expandable element on the spreader is deferrable. Radial is the force-transmitting element plastically and / or elastically deformable by the plastic. Also Rods, plates or the like elements made of steel, for example, embedded in plastic and in power transmission direction can be aligned, stiffening elements for power transmission for pushing the expandable element on the spreader form. This list is not exhaustive either.

A Embodiment of the invention provides that the expansion anchor a Undercut for a rear grip in the concrete slab having. The undercut causes a positive connection and thus a good grip in the concrete slab. In addition, the anchoring in the concrete slab frictionally and / or cohesively. The undercut is through an external thread, through a crosshead, by laterally protruding projections or Barb elements or by a wave, helical, hook-shaped or angled shaft possible. The list the possibilities of an undercut is not exhaustive.

The expandable element may be an expansion sleeve, the unslotted or divided into slits by slits. An embodiment sees a circumferentially wavy ring as spreadable Element before. Such a wavy ring as spreadable Element has the advantage of a small anchoring depth, so allows An anchoring in a thin stone slab.

Another Advantage is a low Aufspreizkraft and still good Anchoring in an undercut hole.

Around to achieve a transverse or radial mobility, sees an embodiment the invention a screw before, the expansion anchor is so at least two parts. He has a concrete anchor in the Concrete plate is anchored, which is part of the expansion anchor and the over the screw with the spreader having Part of the expansion anchor connected or connected. The screw connection has play in the radial direction. As a result, the spreader, So anchored in the stone plate part of the expansion anchor, transverse or radially to the concrete anchor, so anchored in the concrete slab Part of the expansion anchor, movable. In this way, the displacement becomes reached the stone slab opposite the concrete slab.

An embodiment of the invention provides a deformable cover which covers the expansion anchor in the region of the transition from the concrete slab to the stone slab against concrete. The cover may for example be a kind of circumferential skirt. In embodiments of the invention, the force-transmitting element, the deformable Abde have. The deformable cover keeps the expansion anchor following the stone slab free of concrete to ensure the slidability of the stone slab opposite the concrete slab.

A Embodiment of the invention provides a snap device for the force-transmitting element that snaps when the force-transmitting element the expandable element has pushed onto the spreader. The snap device offers on the one hand a check on whether the expandable element is spread as intended. On the other hand holds the snap device the force-transmitting Element after spreading, so after anchoring the expansion anchor in the stone plate.

Further Features of the invention will become apparent from the following description of embodiments in conjunction with the drawing and the Claims. Individual features can each for itself or in any combination in embodiments be realized the invention. Show it:

1 an expansion anchor according to the invention;

2 - 7 different embodiments of force-transmitting elements of the expansion anchor 1 according to the invention; and

8th - 9 two further embodiments of inventive expansion anchor.

The in 1 illustrated, inventive expansion anchor 1 has a shaft 2 with a conical expansion body 3 at one end, pointing in the direction of the shaft 2 widening away. A conical shape is not mandatory for the spreader 3 , On the expansion anchor 1 is an expandable element 4 arranged in the embodiment has the form of a circumferentially wavy ring. The expandable element 4 is from the shaft 2 on the expanding spreader 3 deferrable and is widened, which is referred to as spreading. The expansion anchor 1 is thus in an undercut blind hole 5 anchored, which has a conical expansion in the illustrated embodiment, which forms the undercut. The blind hole 5 is in a stone plate 6 For example, mounted in a natural stone slab, which serves the cladding of a facade of a building, not shown, or other construction. The shaft 2 protrudes into a concrete slab 7 , in which it is anchored positively and / or cohesively. On a the spreader 3 far end of the shaft 2 is a mother 8th for anchoring in the concrete slab 7 screwed. The concrete slab 7 forming concrete is around the shaft 2 in the stone slab 6 anchored expansion anchor 1 on the stone plate 6 cast. Between the concrete slab 7 and the stone plate 6 is a plastic film 9 arranged as a separating layer, which is a displacement of the two plates 6 . 7 against each other.

The expansion anchor 1 has a force-transmitting element 10 on, the to the expandable element 4 and the spreader 3 then in a blind hole 5 the stone slab 6 is arranged. The force-transmitting element 10 is on the shaft 2 displaceable. In the embodiment, the force-transmitting element 10 ring-shaped or sleeve-shaped. It has a higher rigidity in a force transmission direction, ie in the axial direction, than in the radial direction, ie transversely to the force transmission direction. The force-transmitting element 10 is made of plastic, it is elastic in the radial direction, possibly also plastic, deformable. In the axial direction, as mentioned, it is stiff, so that a force for pushing the expandable element 4 on the spreader 3 , ie for spreading the expandable element 4 over the force-transmitting element 10 on the expandable element 4 , is transferable.

The different stiffnesses of the force-transmitting element 10 in the power transmission direction and transversely thereto, ie in the axial and in the radial direction, can be achieved by an inhomogeneous material having a higher mechanical stiffness in a preferred direction, ie in the axial direction than transverse to this direction. Other ways to achieve the different stiffnesses in the power transmission direction and across are given by the shape and / or by two or more different materials with different stiffnesses. 2 . 4 . 6 and 7 show examples, the different stiffness by the shape of the force-transmitting element 10 to achieve, 3 and 5 show examples with different materials.

This in 2 illustrated force-transmitting element 10 is a ring or sleeve with a cylindrical center hole 11 and a circumferentially wavy circumference 12 , Due to the waveform, the force-transmitting element 10 in the longitudinal direction through recesses on its circumference, by the stiffness in the radial direction is reduced as desired.

The force-transmitting element 10 out 4 has the shape of a short tube with a hole-disc-shaped flange 13 at one end. In application the flange closes 13 the blind hole 5 in the stone plate 6 Close at a mouth. The flange 13 is elastically deformable, so that the desired mobility of the expansion anchor 1 in the radial direction in the stone slab 6 given is. The tubular part of the force-transmitting element 10 out 4 is so stiff that a force to Aufsprei zen on the expandable element 4 is transferable.

This in 6 illustrated force-transmitting element 10 has a sleeve, from the ribs 14 protrude spirally. Ribs 14 go in the longitudinal direction and are in the transverse direction, ie in the radial direction of the force-transmitting element 10 , deformable with low force. In the longitudinal direction, ie in power transmission or axis-parallel direction, transmit both the sleeve and the ribs 14 of the force-transmitting element 10 the force to spread the expandable element 4 , Instead of spiraling, the ribs can 14 also radially or tangentially outward (not shown).

In 7 has the force-transmitting element 10 disc-shaped lips 15 in radial planes, which are elastically deformable like sealing lips, so that the force-transmitting element 10 has low rigidity in the radial direction. In the axial direction is the force-transmitting element 10 stiff due to the sleeve shape in its middle. The force-transmitting elements 2 . 4 . 6 and 7 are made of plastic.

In 3 has the force-transmitting element 10 a sleeve 16 Made of steel, which is coated with plastic. This force-transmitting element 10 is through the steel sleeve 16 rigid in axialer, ie in the power transmission direction and due to the plastic coating deformable in the radial direction.

In 5 is the force transmitting element 10 also sleeve-shaped and made of plastic. By type of reinforcements are steel pins 17 embedded in the plastic, the axis-parallel to the center hole of the force-transmitting element 10 are arranged around and the force-transmitting element 10 enforce in the longitudinal direction. The steel pins 17 cause the desired high rigidity in the axial, ie power transmission direction.

Back to 1 As already mentioned, the expandable element 4 with the force-transmitting element 10 on the spreader 3 slidable and thereby expandable and the expansion anchor 1 is in this way in the undercut blind hole 5 in the stone plate 6 anchored. The lower stiffness of the force-transmitting element transversely or in the radial direction allows a mobility of the expansion anchor 1 in the radial direction. The stone plate 6 is thus opposite the concrete slab 7 slidable, allowing shrinkage during curing of the concrete or different thermal expansions of the two plates 6 . 7 be compensated. To connect the stone slab 6 with the concrete slab 7 becomes a number of expansion anchors 1 over the surface of the stone slab 6 distributed in this anchored and with the concrete slab 7 cast concrete. The concrete slab 7 forms a support for the flagstone 6 , Both plates 6 . 7 Together they form a layer composite panel for cladding facades. The two plates 6 . 7 are punctiform over the surface of the stone slab 6 distributed with the expansion anchors 1 connected with each other. As already stated leave the expansion anchors 1 a shift of the two plates 6 . 7 against each other.

In 8th has the expansion anchor 1 as in 1 a conical expansion body 3 with a shaft 2 on, but shorter than in 1 is and with an external thread 28 is provided. The expandable element 4 is in 8th as in 1 a circumferentially wavy ring by sliding on the spreader 3 is spreadable or spread apart. The expansion anchor 1 is thus in an undercut blind hole 5 in a stone plate 6 anchored. Following the spreader 3 is at the expansion anchor 1 out 8th a sleeve 18 for example, steel on the shaft 2 attached, with the expandable element 4 on the spreader 3 deferrable and thus spreadable. The sleeve 18 is in the blind hole 5 the stone slab 6 , The force-transmitting element 10 , which is in the power transmission direction, ie in the axial direction, stiffer than transverse thereto, ie in the radial direction, is located in 8th in the concrete slab 7 , The force-transmitting element 10 can be explained as above and in 2 - 7 be formed represented. In the embodiment, it is a hole-disc-shaped; and it's on the plastic film 9 arranged the stone slab 6 and the concrete slab 7 separates.

On the external thread 17 of the shaft 2 is a concrete anchor 19 screwed, the one axial blind hole 20 with internal thread 21 having. The internal thread 21 has play on the external thread 17 of the shaft 2 on, the two threads 17 . 21 form a screw that has play in the radial direction. Through the game of screw 17 . 21 and the radial deformability of the force-transmitting element 10 is again the desired displacement of the two plates 6 . 7 guaranteed against each other. The concrete anchor 19 is bolt-shaped and has a head 22 to its anchoring in the concrete slab 7 on.

The expansion anchor 1 out 9 points like the expansion anchor 1 out 1 a shaft 2 with a widening spreader 3 at one end. On the spreader 3 is an expandable element 4 that too in 9 again is a ring-shaped ring in the circumferential direction, pushed and thereby expandable to the expansion anchor 1 in an undercut blind hole 5 in a stone plate 6 to anchor. Following the spreader 3 has the shaft 2 a cylindrical section 23 up, emerging from the blind hole 5 in the stone plate 6 until the concrete slab 7 extends into it. Then the shaft goes 2 in a helical section 24 over, the positive and cohesive in the concrete slab 7 is anchored. At the transition from the cylindrical section 23 to the helical section 24 has the shaft 2 a circumferential groove 25 on.

The force-transmitting element 10 is sleeve-shaped and extends over the length of the cylindrical portion 23 of the shaft 2 , It has, as stated, a high rigidity in the axial direction, so that the expandable element 4 with the force-transmitting element 10 on the spreader 3 deferrable and thus spreadable. In the radial direction is the force-transmitting element 10 elastic so that the desired transverse mobility is given to allow the stone slab 6 opposite the concrete slab 7 can move. Unlike in 1 where the force-transmitting element 10 in the stone plate 6 is located, and unlike in 8th where the force-transmitting element 10 in the concrete slab 7 is located in 9 the force-transmitting element 10 both in the stone plate 6 as well as in the concrete slab 7 ,

At his the spreader 3 far end has the force-transmitting element 10 a wrap around apron 26 on, extending from the side of the concrete slab 7 seen concave arched outwards and to the stone slab 6 extends. The skirt 26 lies on the plastic film 9 on, the stone slab 6 from the concrete slab 7 separates. The skirt 26 forms a cover and avoids concrete in the area of the interface between the flagstone 6 and the concrete slab 7 to the expansion anchor 1 arrives. As a result, the radial mobility, ie the desired displaceability of the flagstone 6 opposite the concrete slab 7 guaranteed.

The force-transmitting element 10 has a circumferential bead 27 up in the groove 25 of the shaft 2 snaps when the expandable element 4 with the force-transmitting element 10 on the spreader 3 deferred and thereby spread. The groove 25 and the bead 26 form a snap device.

1

expansion anchor

2

shaft

3

spreader

4

aufspreizbares element

5

blind

6

stone slab

7

concrete slab

8th

mother

9

Plastic film

10

force-transmitting element

11

center hole

12

curl

13

flange

14

rib

15

lip

16

shell

17

steel pin

18

shell

19

concrete anchor

20

blind

21

inner thread

22

head

23

cylindrical shank portion

24

helical shank portion

25

groove

26

apron

27

bead

28

external thread

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 663492 B1 [0003]

Claims (11)

Expansible anchor for connecting a stone slab ( 6 ) with a concrete slab ( 7 ), wherein the expansion anchor ( 1 ) an expandable element ( 4 ), which by sliding on an expanding expansion body ( 3 ) is spreadable, characterized in that the expansion anchor ( 1 ) a force-transmitting element ( 10 ), with which a force for pushing the expandable element ( 4 ) on the spreader body ( 3 ), which is stiffer in the direction of transmission than transverse thereto. Expansion anchor according to claim 1, characterized in that the expansion anchor ( 1 ) is an undercut anchor. Expansion anchor according to claim 1, characterized in that the expansion body ( 3 ) a shaft ( 2 ), and that the force-transmitting element ( 10 ) a through hole ( 11 ), which the shaft ( 2 ), so that the force-transmitting element ( 10 ) on the shaft ( 2 ) is displaceable. Expansion anchor according to claim 1, characterized in that the force-transmitting element ( 10 ) has a cylindrical envelope surface. Expansion anchor according to claim 1, characterized in that the force-transmitting element ( 10 ) is stiffer by its shape in the power transmission direction than transverse thereto. Expansion anchor according to claim 1, characterized in that the force-transmitting element ( 10 ) at least one stiffening element ( 16 ; 17 ), by which it is stiffer in the power transmission direction than transverse thereto. Expansion anchor according to claim 1, characterized in that the expansion anchor ( 1 ) an undercut ( 8th ; 22 ; 24 ) for a rear grip in the concrete slab ( 7 ) having. Expansible anchor according to claim 1, characterized in that the expandable element ( 4 ) is a circumferentially wavy ring. Expansion anchor according to claim 1, characterized in that the expansion anchor ( 1 ) a screw connection ( 17 . 21 ) with a concrete anchor ( 19 ), which in the concrete slab ( 7 ) is anchored, and that the screw ( 17 . 21 ) Has play in the radial direction. Expansion anchor according to claim 1, characterized in that the expansion anchor ( 1 ) a deformable cover ( 26 ) having the expansion anchor ( 1 ) in the area of the transition from the concrete slab ( 7 ) to the stone slab ( 6 ) covers against concrete. Expansion anchor according to claim 1, characterized in that the expansion anchor ( 1 ) a snap device ( 25 . 27 ) for the force-transmitting element ( 10 ), which snaps when the force-transmitting element ( 10 ) the expandable element ( 4 ) on the spreader body ( 3 ) has postponed.