EP2647779A1 - Angle bracket for a façade substructure - Google Patents

Abstract

The bracket (10) has a leg (1) for fastening at an on-site subsurface (11), and another leg (2) for retaining a holding profile (12) of a facade substructure and arranged vertical to the former leg. The latter leg comprises a total area, and a recess (3) is formed in the total area, where a surface area of the recess or a set of recesses is 40 percent of the total area of the latter leg. The bracket is designed as a punching bent part. An edge region (4) of the legs is reinforced by a folding, where the latter leg comprises a spring tongue (5) that is integrally formed with the bracket. An independent claim is also included for a facade substructure.

Description

The invention relates to a bracket for a facade substructure for attaching at least one substantially plate-shaped facade element to an on-site substrate with the features of the preamble of claim 1. Furthermore, the invention relates to a facade substructure with such a bracket.

Background of the invention

Façade substructures of the abovementioned type enable the formation of curtain-type, ventilated facades, wherein façades in the present case are understood to mean not only vertical but also inclined wall surfaces and horizontal ceiling surfaces. Façades form the exterior termination of components that separate an interior from an exterior space. Consequently, high demands are placed on such components in terms of thermal protection. This is usually taken into account that a single or multi-layer thermal barrier coating is applied to the outside of the supporting structure of the component, which is subsequently plastered or - in the case of a curtain, ventilated facade - clad with facade elements.

In order to meet the requirements placed on a low-energy house or a passive house with regard to thermal insulation, significantly stronger single-layer or multi-layered thermal barrier coatings are required, which make it more difficult to install facade elements to realize curtain-ventilated facades. Because the facade elements must have a suitable substructure through the thermal barrier coating on the supporting Construction of the component to be attached. With increasing strength of the thermal insulation layer therefore increases the load of the substructure, as it applies a larger distance of the facade elements to the supporting structure to bridge. If façade elements made of natural stone, glass or the like are used which have a high weight, a permanently secure attachment of these elements can be ensured only by a particularly stable, in particular dimensionally stable substructure. In general, therefore, such substructures of metal profiles, in particular steel or stainless steel profiles produced. However, these have the disadvantage that they conduct heat very well and thus promote the formation of thermal bridges. However, this is precisely what should be avoided. Therefore, substructures for facades are known from the prior art, which comprise a plurality of profiles which are thermally separated from each other to avoid thermal bridges.

State of the art

A multi-part substructure is for example from the utility model DE 298 14 855 U1 known. It comprises an anchoring bracket for attachment to a building wall and an anchoring part which can be connected thereto and which is fastened or fastened to the back of wallcovering panels. Both the anchoring console and the anchor member each have at least one perpendicular to the building wall-oriented leg, which can be brought into contact with the respective other leg and screwed thereto. In order to realize a thermal separation at the same time, an insulator is inserted before screwing between the leg of the anchor member and the leg of the anchoring console, which is intended to prevent heat transfer from the anchored to the building wall anchoring console on the plate-side anchor member. For this purpose, the insulator consists of a material having a poor thermal conductivity, preferably of Polyvinyl chloride, polyurethane or silicate, and is further preferably disc-shaped or plate-shaped.

Based on the above-mentioned prior art, the present invention has the object to provide a bracket for a facade substructure, which allows on the one hand the formation of a passivhaustauglichen facade substructure and on the other hand is able to absorb high loads. Furthermore, a Passivhaustaugliche facade substructure should be specified.

To solve the problems, a bracket with the features of claim 1 and a facade construction with the features of claim 9 are proposed. Preferred developments of the invention are specified in the respective subclaims.

Disclosure of the invention

The proposed bracket for a facade substructure for attaching at least one substantially plate-shaped facade element to an on-site base comprises a first leg for attachment to the on-site background and the first leg substantially perpendicularly arranged second leg for receiving a retaining profile of the facade system. According to the invention, the second leg has a total area in which at least one recess is provided, wherein the area ratio of the one or more recesses is at least 10%, preferably at least 25%, more preferably at least 40% of the total area of the second leg.

By at least one recess not only material is saved and thus reduces the weight of the bracket, but at the same time the heat-conducting Reduced cross-section of the second leg. Because the arrangement of at least one recess in the total area of the second leg, the heat-conducting cross section is reduced substantially to the cross section of webs, which limit the recess or the recesses. If only one, in particular rectangular recess is provided in the total area of the second leg, this is preferably limited by four webs, which at the same time form the two longitudinal edges and the two side edges. In addition, two or more recesses may be provided, which are separated by longitudinal and / or transverse webs. The all-round limitation of a recess by webs contributes to the dimensional stability of the bracket and is therefore to be preferred. In addition, it can be provided that a recess is limited only on three sides by a web and thus extends to a longitudinal or side edge.

According to a preferred embodiment of the invention, the bracket is a stamped / bent part. It is also proposed that at least one recess in the total area of the second leg is a punched-out. Such a support angle is particularly simple and inexpensive to produce from a sheet metal material. For this purpose, a flat part is first punched out of the sheet material, which corresponds to the development of the bracket. The at least one recess is likewise produced in this punching process. Thereafter, the flat part is bent to produce the angular shape of the bracket. The use of a sheet material also allows the production of a variety of flat parts in one step. In addition, the production can be completely automated.

According to one embodiment of the invention it is proposed that at least one edge region of the first leg and / or the second leg is reinforced by folding. The edge region can be folded or folded over one or more times, so that the material lies at least twice in the region of the fold. Particularly advantageous is a reinforcement by folding in the area of a proves Edge, in particular longitudinal edge, of the second leg, since this is weakened by the at least one recess or punched-out. By reinforcing at least one longitudinal edge of the second leg, the stiffness of the mounting bracket in one of the main load directions, namely transversely to the cantilever arm of the bracket is increased, so that the bracket is able to accommodate higher loads. In contrast, in the less stressed areas of the bracket can remain unreinforced, so that the material, in particular sheet metal, here simply lies. As a result, an economical use of material can be effected, which in turn has a favorable effect on the costs.

As a further development measure, it is further proposed that the second leg has at least one spring tongue for receiving a holding profile. About the at least one spring tongue is a clamping connection of the holding profile with the bracket effected, which allows subsequent alignment of the clamped recorded holding profile. Preferably, two spring tongues are provided on the second leg, which are arranged in parallel and allow a clamping at two points connection of the holding profile with the bracket. About the clamping connection at two points a pre-alignment of the holding profile is effected. This facilitates the assembly of the substructure.

Preferably, the spring tongue is integrally formed by using a punching / bending process with the bracket. This means that when punching the flat part for producing the bracket at the same time the spring tongue is formed with or provided for forming the spring tongue material is released. In a later bending process, the released material is then formed into a spring tongue. As a result, the production of a bracket with spring tongue can be simplified and made cheaper. In addition, the shaping of the spring tongue by bending always causes a gain of the second leg of the bracket, since in the bending region of the cross section is doubled and / or stiffened by the formation of a raised edge.

Further preferably, the spring tongue is arranged substantially parallel to the second leg. If the spring tongue has been produced in one piece with the holding bracket by means of stamping and bending, this means that the material for forming the spring tongue has preferably once been folded over. In parallel alignment with the second leg of the bracket, the spring tongue - unlike an arrangement transverse to the second leg - easier aufgebiegen, so that the subsequent alignment of a spring clip over the clamping profile connected holding profile is simplified. Alternatively or additionally, it is proposed that the spring tongue forms an insertion bevel at its free end. This measure also facilitates the assembly of the substructure, since the insertion of the retaining profile between the spring tongue and the second leg is simplified. For preferably, the spring tongue is biased in the direction of the second leg to allow a clamping connection of the holding profile with the bracket. In contact with the insertion can then be pressed or bent over the retaining profile, the spring tongue.

Advantageously, the first leg and / or the second leg has or possess at least one recess for receiving a fastening means. About the attachment means, which is preferably a screw, is or are the first leg of the bracket with the on-site substrate, preferably the supporting structure of a building exterior wall or ceiling, and / or the second leg connected to a holding profile. In the case of a screw, a subsequent release of the connection is possible, for example, to reorient the bracket or the retaining profile as needed. Advantageously, at least one recess for receiving a fastening means is formed as a slot, as such allows a subsequent alignment of the bracket or the retaining profile without moving the recess for receiving the fastener. As a result, the assembly of the substructure can be further simplified. Preferred is a slot formed recess for receiving a fastener made by punching. Openings designed as elongated holes moreover make it possible to absorb thermally induced changes in length, provided that the fastening means received in the oblong hole permits at least a slight displacement of the retaining profile relative to the ground. The slot thus allows the formation of a floating point. To form a fixed point may be provided as an alternative or in addition to at least one slot a round hole. Whether the training of sliding and / or fixed points is required can be found in the respective object statics.

Preferably, a plurality of differently shaped recesses for receiving fastening means are provided at least in the region of the first leg, so that - depending on the existing on-site background - the use of different fastening means is possible. For all on-site substrates, whether concrete, wood or steel, it is therefore only a holding bracket vorzuhalten.

The attachment of the bracket to the on-site ground is also preferred to make in such a way that the recorded on the bracket loads are safely introduced into the load-bearing construction of the building wall or ceiling.

In order to enable the most permanent secure attachment of at least one substantially plate-shaped facade element to an on-site substrate, it is further proposed that the bracket made of metal, in particular of galvanized steel, stainless steel or aluminum, is made. Because these materials prove to be resistant to moisture and are therefore particularly suitable for outdoor use. Furthermore, these materials are available as a sheet material from which punching / bending parts can be produced in a simple manner.

Particularly preferably, a stainless steel sheet is used to produce a holding angle according to the invention. Stainless steel is corrosion resistant and has a lower thermal conductivity than, for example, aluminum. As a result, the formation of a thermal bridge is further counteracted. In addition, a bracket made of stainless steel has a higher strength compared to a bracket made of aluminum. A bracket made of stainless steel can therefore accommodate greater loads, so that the projection or the distance between the on-site background and the facade element can be further increased.

Preferably, the bracket according to the invention is made of a sheet material having a thickness s between 0.5 mm and 2.5 mm, preferably between 1.0 mm and 2.0 mm. Insofar as at least one edge region is reinforced by folding over, holding brackets with a projection of up to about 40 cm can be produced from such sheet metal material. This means that a distance of 40 cm can be bridged by means of the bracket. This allows the formation of an approximately equal single- or multi-layer thermal barrier coating, depending on whether between the thermal barrier coating and the facade element, an air layer is still arranged to form a ventilated curtain wall. In addition, protrusions can be achieved up to about 60 cm, when the facade substructure of the attachment of relatively light facade elements is used. To reach the passive house standard, the projection should be at least 25 cm, preferably at least 30 cm.

The further proposed facade substructure for attaching at least one substantially plate-shaped facade element to an on-site substrate comprises at least one bracket according to the invention and at least one connectable to the bracket holding profile. Bracket and retaining profile together form a passive passive house suitable Substructure made. The Passivhaustauglichkeit the facade substructure is due in particular to the use of a bracket according to the invention. Because this allows the realization of insulation thicknesses, which take into account the significantly increased demands on the thermal insulation in passive houses. However, the bracket according to the invention is not only able to bridge large distances between the on-site ground or the supporting structure and the curtain wall curtain element, but has due to the at least one recess in its second leg a reduced heat-conducting cross-section. This reduces the heat flow through the substructure. Furthermore, the proposed facade substructure can be easily installed, regardless of the existing on-site background.

According to a preferred embodiment, the retaining profile of the proposed facade substructure for connection to the bracket and for receiving a substantially plate-shaped facade element L-shaped or T-shaped. It thus has at least one parallel to the second leg of the bracket alignable leg, so that they can be brought into contact with each other and connected. An at least temporary connection preferably takes place via at least one spring tongue formed on the second leg of the holding bracket, which enables a clamping connection of the holding profile with the holding angle. The clamping connection via the spring tongue allows alignment of the holding profile before it is finally attached via a fastening means, such as a screw or a rivet, on the bracket.

To effect a thermal separation, the facade substructure may further comprise an insulator. This is preferably inserted between the retaining profile and the bracket of the facade substructure. The insulator consists of a poorly heat-conducting material and is preferably between the Placed contact surfaces of the holding profile and the bracket.

Fig. 1-3

jeweils eine Seitenansicht eines ersten erfindungsgemäßen Haltewinkels,

Fig. 4-6

jeweils eine Seitenansicht eines weiteren erfindungsgemäßen Haltewinkels und

Fig. 7

eine perspektivische Darstellung einer erfindungsgemäßen Fassadenunterkonstruktion.

Preferred embodiments of a retaining bracket according to the invention and of a facade substructure comprising such a bracket are described in more detail below with reference to the drawings. These show:

Fig. 1-3

each a side view of a first bracket according to the invention,

Fig. 4-6

each a side view of another bracket according to the invention and

Fig. 7

a perspective view of a facade substructure according to the invention.

Detailed description of the drawings

The in the Fig. 1-3 illustrated bracket 10 has a first leg 1 and a second leg 2, which enclose an angle α = 90 ° (see Fig. 2 ). The first leg 1 serves to attach the bracket 10 to an on-site substrate 11 (see Fig. 7 ) and has three each formed as a slot recesses 8 for receiving suitable fastening means, such as a screw 9, on. The first leg 1 has a width B, which in the present case is 4 cm, and a height H, which in the present case is 13.35 cm. The perpendicular to the first leg 1 arranged second leg 2 has the same height H as the first leg 1 and a projection A, which in the present case is 33 cm. The total area of the second leg 2 is therefore 440.55 cm ² . The second leg 2 has in its total area two rectangular recesses 3 with dimensions a ₁ xb and a ₂ xb, where a ₁ = 12 cm, a ₂ = 12.5 cm and b = 8 cm. The recesses 3 thus extend over a total area of 196 cm ² . The area share of Recesses 3 is thus at least 40% of the total area of the second leg. 2

The large-area recesses 3 have the consequence that the supporting cross-section of the bracket 10 is weakened because on all sides of the recesses 3 only material remains in web width. The edge regions 4 in the region of the longitudinal edges of the second leg 2 are therefore made reinforced by folding over. That is, in the edge regions 4, the material, in this case a stainless steel sheet, is double. The same applies to the edge regions 4 of the first leg 1, which are also reinforced by folding. Since in the edge regions 4 of the first leg 1 are each formed as a slot recess 8, the folded material was recessed in the region of the slot. By folding over the edge regions 4, a thin stainless steel sheet can be used from the starting material. In areas where reinforcement is needed, the material is simply duplicated. This allows a sparing use of the material. The thickness s of the presently used stainless steel sheet is 1.5 mm, so that by folding strengths are achieved, which amount to at least 3 mm.

The folding over of the edge regions 4 of the second leg 2 has also been used in the present case to form spring tongues 5. The spring tongues 5 serve to receive a support profile 12 (see Fig. 7 ). In order to facilitate the insertion of the support section 12 between the spring tongues 5 and the second leg 2 of the bracket 10, the spring tongues 5 form at their free ends in each case an insertion bevel 6 (see Fig. 2 ). The distance between the spring tongues 5 to the second leg 2 is selected such that the spring tongues 5 (not shown) bear under bias on the inserted retaining profile 12 and a clamping force holding the retaining section 12 in abutment with the second leg 2 of the bracket 10. In this way, via the spring tongues 5 at least a temporary connection of the holding profile 12 with the bracket 10 can be effected, which further aligning the holding profile 12 allows. In order to finally determine the position of the retaining profile 12, this is preferably screwed to the bracket. The second leg 2 of the bracket 2 therefore has recesses 7, 8, which serve to receive fastening means, in particular screws 9 (see Fig. 1 ). Of the recesses 7, 8, some are designed as round holes 7 and some as slots 8. The use of elongated holes for fastening a retaining profile 12 with the bracket 10 has the advantage that thermally induced changes in length of the retaining profile 12 can be added and compensated in the region of the slot attachment.

An alternative embodiment of a holding bracket 10 according to the invention is the Fig. 4-6 refer to. This is different from the one of Fig. 1-3 essentially in that the bracket 10 has a lower height H. The height H is now only 6.7 cm. The second leg 2 further has two rectangular recesses 3 of dimensions a ₁ xb and a ₂ xb, wherein only the dimension b has been changed. The dimension b is now 1 cm, which is due to the lower height H of the bracket 10. The recesses 3 thus extend over a total area of 24.5 cm ² . The surface portion of the recesses 3 is thus at least 10% of the total area of the second leg 2, which in the present case is 221.1 cm ² .

The recesses 3 lead to a reduction of the heat-conducting cross section of the bracket 10, so that the heat flow through the bracket 10 is reduced. The large projection of the bracket 10 of 33 cm allows the formation of about 30-35 cm thick thermal barrier coatings. As a result, the bracket 10 in conjunction with a retaining profile 12 forms a passive house suitable facade substructure. At the same time provide the reinforced edge portions 4 of the bracket 10 for sufficient load capacity, so that even heavy facade elements, such as glass or natural stone slabs, over a Façade substructure according to the invention can be attached to an on-site support.

A facade substructure according to the invention comprising at least one holding angle 10 and a holding profile 12 is exemplary in the Fig. 7 shown. The on-site substrate 11 in the present case forms a solid exterior building wall, to which the bracket 10 of the facade substructure is attached. The first leg 1 of the bracket 10 is thereby indirectly on a possible unevenness compensating intermediate layer on the on-site substrate 11, so that the height H of the bracket 10 is available in the main load direction. However, the height H is interrupted by the recesses 3, so that only a reduced cross-section for load transfer remains. Due to the reinforced edge portions 4, however, this is sufficiently dimensioned. The reinforced edge portions 4 of the second leg 2 form at the same time on their side facing away from the base 11 ends spring tongues 5, which serve to receive a support section 12 and an insulator 13, which is placed in the region of the receptacle to the support section 12. The insulator 13 is not absolutely necessary for the formation of a passive house-compatible facade substructure, but is of advantage since a thermal separation of the retaining profile 12 from the mounting bracket 10 is effected via this. In addition, the holding profile 12 itself may be made of a poorly heat-conducting material, so that in this case an insulator 13 would be superfluous.

The invention is not on the in the Fig. 1-7 illustrated embodiments, but also includes modifications. These may relate in particular to the specific design, number and arrangement of the recess / recesses 3 of the second leg 2 of the bracket 10 and the specific design, number and arrangement of the spring tongue / spring tongues 5. Furthermore, the dimensions of the bracket should be selected according to the requirements.

LIST OF REFERENCE NUMBERS

1

First leg

2

Second thigh

3

recess

4

edge region

5

spring tongue

6

chamfer

7

Recess, round hole

8th

Recess, oblong hole

9

screw

10

bracket

11

On-site underground

12

retaining profile

13

insulator

Claims (11)

Support bracket (10) for a facade substructure for fastening at least one substantially plate-shaped facade element to an on-site substrate (11), comprising a first leg (1) for attachment to the on-site substrate (11) and one to the first leg (1) arranged substantially vertically second leg (2) for receiving a retaining profile (12) of the facade substructure, characterized in that the second leg (2) has a total area in which at least one recess (3) is provided, wherein the surface portion of a recess (3) or of the plurality of recesses (3) is at least 10%, preferably at least 25%, more preferably at least 40% of the total area of the second leg (2). Bracket according to claim 1,
characterized in that the bracket (10) is a stamped and bent part and / or at least one recess (3) is a punched out. Bracket according to claim 1 or 2,
characterized in that at least one edge region (4) of the first leg (1) and / or the second leg (2) is reinforced by folding. Bracket according to one of the preceding claims,
characterized in that the second leg (2) has at least one spring tongue (5) for receiving a retaining profile (12). Bracket according to claim 4,
characterized in that the spring tongue (5) is formed integrally with the bracket (10). Bracket according to one of the preceding claims,
characterized in that the spring tongue (5) is arranged substantially parallel to the second leg (2) and / or forms an insertion bevel (6) at its free end. Bracket according to one of the preceding claims,
characterized in that the first leg (1) and / or the second leg (2) has at least one recess (7, 8) for receiving a fastening means, in particular a screw (9), preferably having at least one recess ( 8) is designed as a slot. Bracket according to one of the preceding claims,
characterized in that the bracket (10) is made of metal, in particular of galvanized steel, stainless steel or aluminum, wherein the metal is preferably present as a metal sheet and a thickness (s) between 0.5 mm and 2.5 mm, further preferably between 1.0 mm and 2.0 mm. Façade substructure for fastening at least one substantially plate-shaped facade element to an on-site substrate (11) comprising at least one bracket (10) according to one of the preceding claims and at least one holding profile (12) connectable to the bracket (10). Facade substructure according to claim 9,
characterized in that the holding profile (12) for connection to the bracket (10) and for receiving a substantially plate-shaped facade element L- or T-shaped. Façade substructure according to claim 9 or 10,
characterized in that the facade substructure further comprises an insulator (13) which can be inserted to realize a thermal separation between the holding profile (12) and the bracket (10).

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