FIELD OF THE INVENTION

The invention relates to a fastening system for a fagade element for connecting to an existing fagade. Further aspects of the invention relate to methods for fastening a fagade element to an existing fagade, a fagade and a method for the refurbishment of an existing fagade to increase energy efficiency.

PRIOR ART

EP 3 808 553 A1 which forms the basis of the preamble of claim 1 discloses a fagade element and a method for the refurbishment of buildings to increase energy efficiency, wherein the fagade element has a high degree of prefabrication. The fagade element comprises a first insulating element which is arranged in a wooden frame. The insulating element with the wooden frame is encapsulated on the one hand by a solid board, e.g. an OSB, and on the other hand by e.g. a cement-bonded second solid board. Provided on the rear side of the first solid board is a connection layer for connecting to the existing fagade, fastened with a second insulating material layer and first connectors. When installing the fagade element on the existing fagade, the existing fagade is first provided with second connectors and the prefabricated fagade element is fastened to the existing fagade by means of the first and second connectors. The connectors are suitable to form a connection with one another guaranteeing tensile strength and are designed to introduce the load of the fagade element into the existing fagade.

A disadvantage of the connectors disclosed in EP 3 808 553 A1 is that in the case of heavy fagade elements and also e.g. masonry substrates, a large number of connectors must be used by reason of the introduction of weight into the existing fagade, which makes refurbishment to increase energy efficiency expensive.

DE 34 19 457 A1 discloses a curtain wall consisting of thin concrete slabs having a thickness of between 5 and 10 cm and a storey-spanning length, in particular in the range between 9 and 11 m. These concrete slabs are suspended from a supporting frame consisting of bearing walls and ground plates or floor plates by means of anchor elements which are embedded in the concrete slabs on the one hand and in the bearing walls on the other hand. In order to avoid wobble movements in the wind, the concrete slabs are additionally connected to further ground plates or floor plates at their base and, where appropriate, at an intermediate height with the aid of further fastening anchors which form loose bearings, wherein the further fastening anchors are likewise embedded in the concrete slabs and ground plates or floor plates.

A disadvantage of the system described in DE 34 19 457 A1 is the high degree of prefabrication by reason of the embedding of the fastening anchors and the inadequate adaptability following therefrom. On an industrial scale, the system is suitable only for new buildings, but not for the refurbishment of old buildings which have a high degree of individuality.

DE 72 20 382 II relates to an adjustable suspension device for fagade panels or cladding panels. The fastening of the fagade elements is effected by means of angle elements which are fastened on the one hand to the existing fagade and on the other hand to the facade element, wherein the fastening is effected by means of screws. Provision is also made that insert pieces are already pre-installed in the fagade element and the final fixing is then effected by means of fastening screws.

DE 10 2011 082 049 A1 discloses a mounting device for fastening fagade elements to a wall, wherein mounting brackets having tension struts are used.

OBJECT OF THE INVENTION

It is an object of the invention to provide a fastening system for a fagade element which is suitable for connecting to existing fagades consisting of concrete, masonry or wood.

A further object of the invention is to provide an adaptable fastening system which manages in particular also with fewer anchor brackets. Furthermore, the fastening system is to be designed to be three-dimensionally adjustable after positioning of the fagade element on the existing fagade.

It should also be possible to design the fastening system adaptively for different applications, in particular adaptively in relation to the weight of the fagade elements and wind suction and wind pressure loads.

Finally, the fastening system should also comprise as few individual parts as possible in order to enable production in large quantities in a cost-effective manner and to keep installation complexity low.

DISCLOSURE OF THE INVENTION

A fastening system in accordance with the invention for a fagade element for connecting to an existing fagade comprises two different components, wherein a first component comprises at least one first anchor bracket for fastening to the existing fagade and at least one second anchor bracket for fastening to the fagade element, wherein in each case a first and a second anchor bracket can be connected to one another by means of first bracket fastening means, and wherein the second component comprises at least one third anchor bracket for fastening to the existing fagade and at least one fourth anchor bracket for fastening to the fagade element, wherein in each case a third and a respective fourth anchor bracket can be connected to one another by means of second bracket fastening means.

Provision is made that at least the second anchor bracket and the fourth anchor bracket are designed to be fastened to the fagade element, in particular to wooden frame elements of the fagade element, by dowelling, nailing, screwing and/or hooking. For example, the second anchor bracket and the fourth anchor bracket can have circular holes or elongate holes which are suitable for this purpose. Furthermore, in preferred embodiments provision is made that the first anchor bracket and/or the second anchor bracket are designed to be fastened to the existing fagade by dowelling, nailing, screwing and/or hooking. For example, the first anchor bracket and third anchor bracket can have circular holes or elongate holes which are suitable for this purpose.

The fastening system can comprise, in terms of a set, the fastening means for dowelling, nailing, screwing and/or hooking the second anchor bracket and/or the fourth anchor bracket to the fagade element.

The fastening system can comprise the fastening means for dowelling, nailing, screwing and/or hooking the first anchor bracket and/or the third anchor bracket to the existing fagade.

In an advantageous manner, the installation point and number of anchor brackets and fastening means are not specified and can be adjusted adaptively, in some embodiments even on the building site.

In accordance with the invention, provision is additionally made that the first component is configured to introduce substantially a weight of the fagade element into the existing fagade, and that the second component is configured to introduce substantially a wind suction load and wind pressure load into the existing fagade. Splitting the fastening system into first and second components with different functions makes possible an adaptive solution for different applications. Depending upon the weight of the fagade element, more or less first and second anchor brackets which form the first component can be provided in the fastening system. Moreover, in dependence upon the required securing in relation to wind suction and securing in relation to wind pressure, more or less third and fourth anchor brackets which form the second component can be provided in the fastening system. By dividing the tasks of the first and second components, the overall system is more favourable than a system in which the anchor brackets have both functionalities, since, in general, the number of wind suction and wind pressure anchor brackets required is the predominant factor.

The two components are different from one another or are designed differently. Preferably, the first anchor bracket is designed differently from the third anchor bracket. Preferably, the second anchor bracket is designed differently from the fourth anchor bracket.

For a given fagade element, in each case at least two first and second anchor brackets are preferably provided in order to fasten the fagade element at the two top corners in each case. Depending upon the weight, further first and second anchor brackets can be used, preferably always at the same spaced interval therebetween, e.g., always at a spaced interval of 1 m to 3 m. More or less interspersed third and fourth anchor brackets can be provided, wherein the number thereof can be adapted depending upon the wind suction load and wind pressure load.

The first component is configured to introduce substantially a weight of the fagade element into the existing fagade. "Substantially" is understood to mean that at least 70%, preferably at least 80% and further preferably at least 90%, of the weight of the fagade element is introduced into the existing fagade via the first component. Furthermore, the first component can partially absorb wind suction and wind pressure loads, wherein this accounts preferably for no more than 30%, more preferably no more than 20%, and even more preferably no more than 10%.

The second component is configured to introduce substantially a wind suction load and wind pressure load into the existing fagade. Again, "substantially" is understood to mean that the second component introduces at least 70%, preferably at least 80% and further preferably at least 90%, of the wind suction load and wind pressure load into the existing fagade. Furthermore, the second component can introduce a part of the weight of the fagade element into the existing fagade, wherein this part accounts for no more than 30%, preferably no more than 20%, and even more preferably no more than 10%, of the weight of the fagade element.

The first and second anchor brackets can be arranged loosely positioned one on top of the other, wherein the first anchor bracket can form a support for the second anchor bracket. In particular, the first anchor bracket can comprise a support in the form of longitudinal webs which can support a member of the second anchor bracket. Alternatively, the second anchor bracket can be fastened to the first anchor bracket in a suspended manner, wherein the embodiment as a support is preferred for structural reasons.

As an alternative to longitudinal webs, the first anchor bracket can also comprise one or a plurality of transverse webs which can support a member of the second anchor bracket.

The first and the second anchor bracket can be positioned loosely one against the other. In a preferred manner, provision is made that the first and the second anchor bracket can be connected to one another by means of first bracket fastening means.

The first bracket fastening means can comprise e.g. a fastening bridge, wherein the first anchor bracket, the second anchor bracket and the fastening bridge form, by means of web fastening means such as e.g. screws, a first clamping pack after installation, in which the first anchor bracket, in particular the supported member of the first anchor bracket, and the fastening bridge clamp the second anchor bracket, in particular the member to be supported of the second anchor bracket, therebetween. The fastening bridge can comprise a web and a plurality of fastening means, such as for instance screws, threaded pins or press pins or the like. The first anchor bracket and the web can be fixedly screwed together and clamp the second anchor bracket, in particular the member to be supported of the second anchor bracket, therebetween. The clamping pack is also designed to introduce at least also a part of the wind suction load and wind pressure load into the existing fagade, wherein in accordance with the invention the main proportion of the wind suction load and wind pressure load is introduced into the existing fagade via the second component.

According to a preferred embodiment, the member to be supported of the second anchor bracket comprises at least one, preferably two, receivers for a height adjustment means. The receivers are designed e.g. in the form of threaded bores. The height adjustment means are designed e.g. as threaded bars, screws or the like. The height adjustment means render it possible to adjust the fagade element in the vertical direction after positioning it against the existing fagade.

According to a preferred embodiment of the invention, the member to be supported of the second anchor bracket comprises at least one transverse web. The embodiment as an individual transverse web is preferred for structural reasons. The transverse web can be fastened in particular to a spacer which can be designed e.g. as a U-profile. Alternatively, the member to be supported can also comprise one or a plurality of longitudinal webs which are supported e.g. on a support of the first anchor bracket, which is designed as a transverse web. A suspended fastening of this alternative embodiment is also possible within the scope of the invention.

In one embodiment, the first anchor bracket comprises at least one, preferably two receivers - designed in particular as threaded bores or screw holes - for the web fastening means. The fastening bridge can be fastened in particular after attaching the fagade element to the existing fagade and three-dimensional adjustment.

The first anchor bracket preferably comprises at least one first flat piece for lying against and anchoring to the existing fagade. The flat piece is provided e.g. with drill holes with or without a thread in order to permit the fastening of the anchor bracket to the existing fagade, e.g. by means of screws, hooks, nails or the like. The size of the flat piece is to be dimensioned such that the pressure on the construction caused by the weight of the fagade is distributed over a large area.

The second anchor bracket preferably comprises at least one second flat piece for lying against and anchoring to the existing fagade. The second flat piece is preferably provided with a row of drill holes without a thread in order to permit corresponding anchoring in the fagade element. Instead of providing a flat piece, it is also possible to provide a profile piece, e.g. a U-profile or a C-profile. The counterpiece on the fagade element is typically a solid board, e.g., an OSB, or a wooden frame element, but can also comprise e.g. metal struts.

In particular, for the purpose of connecting to existing fagades consisting of masonry or wood, provision is preferably made that the first anchor bracket comprises an anchor piece which is designed in particular as an axially symmetrical profile and is fastened to the first flat piece of the first anchor bracket. The profile can be e.g. a T-profile, I- profile, U-profile, V-profile or TH-profile. Preferably, the profile is designed as a double T-profile. The anchor piece can be inserted into a drill hole made for this purpose in the existing fagade consisting of masonry and, for example and preferably, can be adhered, mortared or cast therein. Therefore, the fastening system can be used securely not only in the case of existing fagades having a concrete surface.

The invention is also applicable to the case of recessed floor slabs. A floor slab is described as "recessed" within the context of the present disclosure if the floor slab is recessed behind a front face of the existing fagade, e.g. by a few centimetres to 50 cm. In this case, the anchor piece is either solid or designed to fill the volume of the region of the recess by means of suitable cavity profiles, e.g. U-profiles or C-profiles, in order to provide the flat piece flush with the other flat pieces on the floor slab. In the case of the recessed floor slab, the anchor piece can also be inserted in the existing fagade and, for example and preferably, can be adhered, mortared or cast therein. Therefore, the fastening system can also be used reliably in the case of recessed floor slabs.

The second component is configured to introduce substantially a wind suction load and wind pressure load into the existing fagade. The third and fourth anchor bracket can be connected to one another by means of second bracket fastening means. The second bracket fastening means, the third and the fourth anchor bracket form, after installation, a second clamping pack with a clamping effect in the direction of the wind suction load and wind pressure load, i.e. generally perpendicular to the plane of the existing fagade. The third anchor bracket preferably comprises at least one third flat piece for lying against and anchoring to the existing fagade. The size of the flat piece is tailored to the expected wind suction load and wind pressure load, and so it is possible to distribute the load, i.e. pressure and tension, to a planar piece of the existing fagade.

The fourth anchor bracket preferably comprises at least one fourth flat piece for lying against and anchoring to the fagade element. The fourth flat piece is preferably equipped with drill holes with or without a thread in order to be fastened to the fagade element by means of screws, nails, hooks or the like.

In one advantageous embodiment, after fastening the third and the fourth anchor bracket to one another, the fourth flat piece is oriented perpendicularly to the third flat piece. The fourth flat piece can be arranged in an aperture provided for this purpose in the fagade element. The arrangement not only has structural advantages, but also facilitates the installation of the fagade element on the existing fagade.

In particular, the fourth flat piece can have on the edge a screw receiver which in particular is welded on and which is designed for receiving a second bracket fastening means, in particular a threaded pin portion or screw portion.

According to one embodiment, the third anchor bracket comprises an attachment profile having a longitudinal slot which is designed to receive a second bracket fastening means. The attachment profile can be formed e.g. from two L-profiles to be aligned with one another, from a C-profile or the like. The second bracket fastening means can be e.g. a threaded pin or screw portion or the like which can be introduced into the longitudinal slot. A large number of further possible embodiments are known to a person skilled in the art. The attachment profile can be welded to the flat piece, and alternatively can also be formed in one piece therewith.

In particular, the third anchor bracket can comprise a Halfen rail which is provided with supporting and fastening flanges for lying against and anchoring to the existing fagade.

In preferred embodiments, the first, second, third and fourth anchor brackets are designed as metal formed parts, in particular e.g. as steel profiles, in particular galvanised steel profiles. Alternatively, anchor brackets which are manufactured from synthetic material, in particular from fibre-reinforced synthetic materials, can be provided, wherein this is more likely to be advantageous in the case of lightweight fagade elements.

In accordance with the invention, the use of one of the described fastening systems for connecting the fagade element to the existing fagade is proposed.

According to a further aspect, the invention comprises methods for fastening a fagade element to an existing fagade by means of one of the described fastening systems.

In a first embodiment of the method, in a first step, first and third anchor brackets are attached to the existing fagade. In a second step, second and fourth anchor brackets are attached to the fagade element. In particular, the second and fourth anchor brackets can be fastened to wooden frame elements of the fagade element or to solid boards of the fagade element, e.g. with screws, hooks, nails or the like. In an advantageous manner, the fagade element can be pre-assembled with the second and fourth anchor brackets in a factory. The production of the fagade elements as part of a prefabrication procedure in the factory reduces the number of activities at the building and thus ensures less inconvenience for the residents of the building with the existing fagade.

In a third step, the first and second anchor brackets are connected to one another by means of the first bracket fastening means. The connection can be implemented as a loose support. The second anchor bracket can be supported on the first anchor bracket. Alternatively, a fixed connection can be implemented, in particular in the form of a clamping pack. In the case of the fixed connection, a first clamping pack is provided having a clamping effect in preferably the vertical direction, alternatively in the vertical direction with a blocker also in the horizontal direction. Here and hereinafter, vertical direction is generally understood to be an orientation along the surface of the existing fagade and horizontal direction is understood to be a direction extending perpendicularly to the surface of the existing fagade, related to typical house construction. By supporting and/or fixedly connecting the first anchor brackets with the second anchor brackets, the load of the fagade element is absorbed by the existing fagade.

In a fourth step, the third and fourth anchor brackets are connected to one another by means of the second bracket fastening means. A second clamping pack is formed having a clamping effect in the direction of the wind suction load and wind pressure load, i.e. horizontally in the aforementioned sense. The second clamping pack provides a connection guaranteeing tensile strength of the third and the fourth anchor bracket.

In an alternative embodiment of the method which is particularly advantageous for the embodiment described with reference to figures 11-13, it is also assumed that prefabricated fagade elements are provided, but in this case only the second anchor brackets are attached to the fagade element at the factory, in particular by dowelling, nailing, screwing and/or hooking the second anchor brackets to wooden frame elements of the fagade element.

In a first step, first and third anchor brackets are then initially attached to the existing fagade.

In a second step, the first and second anchor brackets are connected to one another by means of the first bracket fastening means, if necessary with the production of a first clamping pack, in order to introduce the weight of the fagade element into the existing fagade.

In a third step, the third anchor brackets are connected to the fourth anchor brackets by means of the second bracket fastening means initially loosely or optionally already fixedly connected to one another. In this case, the fourth anchor brackets with threaded rods or screws fastened thereto are introduced into the Halfen rails and fastened.

In a fourth step, the fourth anchor brackets are connected to the fagade element, in particular by fastening the fourth anchor brackets in apertures provided for this purpose in the wooden frame elements of the fagade element, in particular by dowelling, nailing, screwing and/or hooking. If not already the case, finally the third anchor brackets are fixedly connected to the fourth anchor brackets.

According to a preferred embodiment, more third and fourth anchor brackets are used than first and second anchor brackets in both possible variants of the methods when fastening the fagade element to the existing fagade. For example, for a given fagade element, second anchor brackets are attached merely to the top two corners of the fagade element and further second anchor brackets are attached therebetween if the weight of the fagade element requires this. Fourth anchor brackets can be attached between the second anchor brackets, but also e.g. to the bottom corners of the fagade element or also in portions which are central in relation to the height. It has been shown that preferably at least twice as many third and fourth anchor brackets can be used as first and second anchor brackets. Therefore, in a preferred embodiment, provision is made that the number of third and fourth anchor brackets is 1.5 to 3 times the number of first and second anchor brackets per fagade element.

In both possible variants of the methods, provision can advantageously be made that the fagade element is adjusted in relation to its position and/or inclination with respect to the existing fagade. In particular, the adjustment can be effected by manipulating the height adjustment means and positioning the threaded pin in the longitudinal slot.

With the measures of the invention, complete 3D fine-positioning of the fagade element in relation to the existing fagade is possible.

The height of the fagade element can be adjusted by manipulating the height adjustment means. When using a plurality of first and second anchor brackets, the inclination of the fagade element can be adjusted in the plane of the existing fagade by manipulating the height adjustment means differently. The adjustment is effected in an expedient manner before the first and second anchor brackets are connected by means of the first bracket fastening means.

The spaced interval between the fagade element and the existing fagade can be adjusted by manipulating the threaded pins or screws in the receivers provided for this purpose on the fourth anchor bracket, e.g. in the longitudinal slot of the Halfen rail. This is possible in a particularly easy manner in those embodiments of the invention, in which the first and second anchor brackets form merely a clamping pack and are not screwed together at a defined point.

The inclination of the facade element perpendicular to the existing fagade can be adjusted, i.e. tilting of the fagade element with respect to the existing fagade, by manipulating the threaded pins or screws in the receivers provided for this purpose on the fourth anchor bracket, e.g. in the longitudinal slot of the Halfen rail.

Displaceability in the horizontal is likewise provided. This is possible in a particularly advantageous and easy manner in those embodiments of the invention where the fourth anchor pieces are fastened to the fagade element in oversized apertures provided for this purpose, after the third and fourth anchor brackets have been connected to one another.

In particular in the case of existing fagades consisting of masonry or wood, provision is preferably made in both possible variants of the methods that before the first anchor brackets are attached to the existing fagade, the existing fagade is provided with receivers for anchor pieces e.g. by means of a drill bit for socket outlets. During or after attachment of the first anchor brackets to the existing fagade, the anchor pieces are adhered, mortared or cast into the existing fagade.

According to a further aspect, a fagade comprises an existing fagade and a fagade element fastened by means of one of the described fastening systems, preferably a plurality of fagade elements fastened in this manner.

Within the scope of a method in accordance with the invention for the refurbishment of an existing fagade to increase energy efficiency, the fagade can be examined initially in relation to the expected wind suction load and wind pressure load. On the basis of the ascertained wind suction load and wind pressure load and in dependence upon the size and/or number of fagade elements, the number of third and fourth anchor brackets can be determined, and/or also the ratio of the number of first and second anchor brackets to the number of third and fourth anchor brackets. In dependence upon the thus determined numbers of third and fourth anchor brackets, the size and/or number of facade elements can be optimised and/or the positions of the anchor brackets on the existing fagade and on the fagade elements can be distributed in an optimised manner.

The installation of the anchor brackets on the existing fagade and the installation of the fagade elements on the anchor brackets are preferably carried out by means of a crane or a lifting platform as described above. In an advantageous manner, the fastening system allows installation without the need for scaffolding and provides for easy removal.

BRIEF DESCRIPTION OF THE FIGURES

Further preferred embodiments of the invention are described in detail hereinafter with reference to the figures. In the drawing:

Figure 1 shows a perspective view of a fastening system according to one embodiment of the invention,

Figure 2A shows a side sectional view of an existing fagade with a first anchor bracket arranged therein, according to one embodiment of the invention,

Figure 2B shows a plan view of the existing fagade with the first anchor bracket of figure 2A arranged therein,

Figure 3A shows a side sectional view of a fagade element with a second anchor bracket fastened thereto, according to one embodiment of the invention,

Figure 3B shows a plan view of the fagade element with the second anchor bracket of figure 3A attached thereto,

Figure 4A shows a front view of a first anchor bracket according to one embodiment of the invention,

Figure 4B shows a side view of the first anchor bracket of figure 4A,

Figure 4C shows a plan view of the first anchor bracket of figure 4A,

Figure 5A shows a front view of a second anchor bracket according to one embodiment of the invention,

Figure 5B shows a side view of the second anchor bracket of figure 5A,

Figure 5C shows a plan view of the second anchor bracket of figure 5A, Figure 6A shows a side view of a web,

Figure 6B shows a plan view of the web of figure 6A,

Figure 7 shows a sectional plan view of an existing fagade and a fagade element which are connected to one another by means of a second component, according to a first embodiment,

Figure 8A shows a plan view of a third anchor bracket according to a first embodiment of the invention,

Figure 8B shows a front view of the third anchor bracket of figure 8A,

Figure 9 shows a plan view of a fourth anchor bracket according to a first embodiment of the invention,

Figure 10 shows a plan view of a base plate,

Figure 11 shows a perspective view of a fagade element which is connected to an existing fagade by means of a second component, according to a second embodiment,

Figure 12 shows a front view of a third anchor bracket according to a second embodiment of the invention, and

Figure 13 shows a perspective view of a fourth anchor bracket according to a second embodiment of the invention.

EMBODIMENTS OF THE INVENTION

Like components or components acting in an identical manner are designated hereinafter by like reference signs. The description of these members will not be repeated hereinafter.

Figure 1 shows a perspective view of a fastening system 2 for a fagade element for connecting to an existing fagade according to one embodiment of the invention.

The fastening system 2 comprises a first component 10 with a first anchor bracket 12 for fastening to the existing fagade and a second anchor bracket 14 for fastening to the fagade element. The first anchor bracket 12 and the second anchor bracket 14 are connected to one another by means of a first bracket fastening means 16 which is described and illustrated in greater detail in particular in figure 2A and figure 6A. By clamping a member 142 to be supported of the second anchor bracket 14 between a supported member 122 of the first anchor bracket 12 and a web 162, a part or all of the weight of the fagade element is introduced into the existing fagade in the composite formed by the anchor brackets 12 and 14.

The fastening system 2 comprises a second component 20 with a third anchor bracket 22 for fastening to the existing fagade and a fourth anchor bracket 24 for fastening to the fagade element.

Figure 2A shows the first anchor bracket 12 of figure 1 in a side sectional view and after installation thereof on an existing fagade 6.

The first anchor bracket 12 is inserted by means of an anchor piece 130 into a drill hole introduced in the existing fagade 6.

Moreover, figure 2A illustrates the first bracket fastening means 16. They comprise a fastening bridge 160 with a web 162 and two web fastening means 164, e.g. screws.

The first anchor bracket 12 comprises a support 122 for receiving a member 142 to be supported of a second anchor bracket 14, which is illustrated, e.g., in figure 3A. The fastening bridge 160 clamps the member 142, which is to be supported, onto the support 122. As a result, a clamping pack is provided which has a clamping effect in particular in the vertical direction which, in general, coincides with the direction of the weight of the fagade element.

At the same time, the clamping pack exerts a clamping effect in the horizontal direction and acts as way of introducing horizontal forces, e.g. on a wind suction load and wind pressure load acting on a fagade element.

Figure 2B shows that the support 122 is formed from two parallel longitudinal webs 124. In the installed state, impact points 129 for height adjustment means 18 (see figure 3A) are present on the longitudinal webs 124 and depend upon the adjustment of the first and second anchor bracket 12, 14 with respect to one another.

Figure 3A shows a second anchor bracket 14 according to one embodiment of the invention, which is fastened to a fagade element 4.

The contact surface against the fagade element 4 is formed by a profile piece 141 , e.g. a C-profile or a U-profile. After installation, a central web of the profile piece 141 lies against the fagade element 4, the outer flanges extend away from the fagade element 4 in the direction of the existing fagade 6.

Figure 3B shows, on the member 142 to be supported, two receivers 146 for the height adjustment means 18. The height adjustment means 18 are e.g. screws or threaded rods. The receivers 146 are designed in an expedient manner in the form of threaded bores. They are preferably through-bores so that the height adjustment means 18 can be manipulated from above for adjustment purposes. In the illustrated exemplified embodiment, two receivers 146 for the height adjustment means 18 are specifically provided on a transverse web 144 of the second anchor bracket 14 in a manner which is not limiting for the invention.

Figures 4A to 4C show the first anchor bracket 12 of figures 2A and 2B in various views. The first anchor bracket 12 comprises a first flat piece 120 which introduces the weight of the fagade element 4 into the existing fagade 6 in a planar manner. In this case for example, but in a manner which is not limiting for the invention, the two longitudinal webs 124 are welded onto the flat piece 120 and protrude from the flat piece in the direction of the fagade element 4 to be installed. The longitudinal webs 124 are supported against the first flat piece 120 via substantially triangular supporting portions 126. Provided on the longitudinal web 124, which serves as a support 122 for the second anchor bracket 14 (not illustrated), are the receivers 128 the web fastening means 164 and the first receivers 129 for the height adjustment means 18. The anchor piece 130 protrudes perpendicularly from the flat piece 120 in the opposite direction to the longitudinal webs 124. The flat piece 120 is provided with two elongate holes 132 for fastening to the existing fagade. A first circular hole 134 serves as a filling opening for a preferably two-component adhesive or casting compound, alternatively as an outlet opening for excess mortar.

Figures 5A to C show the second anchor bracket 14 of figure 3A and 3B in various views. In this case, as an alternative to the embodiment illustrated in figure 3A, the second anchor bracket 14 comprises a second flat piece 140 which extends longitudinally and lies against the fagade element 4 after installation.

The second anchor bracket 14 is provided with a number of second circular holes 136, in this case e.g. but not in a limiting manner, 7 second circular holes 136 for fastening to the fagade element 4. The size of the second circular holes 136 can vary and is tailored to the expected weight of the fagade element 4. Instead of circular holes 136, elongate holes can be provided in order to be able to screw in the fastening means, e.g. countersunk head screws, at a variable angle, i.e. at a 90° angle or at an angle different from 90°. A non-orthogonal screw connection may be required due to the material thickness of the fagade element 4. In an advantageous manner, e.g. an angle disk can be used in order to provide an angled support for a countersunk head screw which can then be screwed through the elongate hole of the second anchor bracket 14 and the fagade element 4 at an angle defined by the angle disk.

The member 142 to be supported in contact with the first anchor bracket 12 is the transverse web 144, which is arranged on a spacer 148 spaced apart from the second flat piece 140. In the illustrated embodiment, the spacer 148 is designed by way of example but in a manner not limiting for the invention, in the form of a U-profile open at the top. A longitudinal axis of the transverse web 144 extends perpendicularly to a longitudinal axis of the flat piece 140 and perpendicularly to a longitudinal axis of the U-profile. The transverse web 144 has fastening flanges which protrude laterally over the U-profile and the flat piece. The receivers 146 for the height adjustment means 18 are formed on the transverse web 144, in particular on the fastening flanges thereof. The receivers 146 are e.g. screws holes with threads. Instead of the flat piece 140, a profile piece 141 , e.g. a C-profile piece or U-profile piece, can be used in alternative embodiments as described with reference to figure 3A and is fastened preferably to a web portion on the fagade element 4 and its flange sections protrude in the direction of the existing fagade 6. The statements made in relation to shape of the openings, i.e. circular holes 136 or elongate holes, the optional installation of an angle disk and the arrangement of the transverse web 144 also apply to the embodiment with a profile piece 141 .

Figures 6A and 6B show a web 162 of the fastening bridge 160 of figure 2A. The web 160 is provided as a rectangular profile with the two receivers 128 for the web fastening means 164. In this case, the receivers 128 are each located at the opposite end of the web 162.

Figure 7 shows an embodiment of the second component 20 of the fastening system 2 of figure 1. The second component 20 comprises the third anchor bracket 22 which is fastened to the existing fagade 6, and the fourth anchor bracket 24 which is fastened to the fagade element 4. The third anchor bracket 22 and the fourth anchor bracket 24 are fastened to one another by means of second bracket fastening means 26 and form a clamping pack having a clamping effect in the horizontal direction which coincides with the direction of the wind suction load and wind pressure load on the existing fagade and which lies in the plane of the drawing in the perspective illustrated in figure 7.

The second bracket fastening means 26 comprise two base plates 260, which are illustrated once again in figure 10, and a threaded pin 262, which determines the spaced interval between the fagade element 4 and the existing fagade 6. The threaded pin 262 is fixed to the fourth anchor bracket 24 with a lock nut 264. On the opposite side, the threaded pin 262 is fixed to the base plates 260 likewise by means of two lock nuts 264.

Figures 8A and B show the third anchor bracket 22 in various views. The third anchor bracket 22 comprises a third flat piece 220 having two elongate holes 132 which are provided at opposite ends of the flat piece 220. Two L-profiles 224 directed towards one another are welded to the third flat piece 220, wherein a first limb 226 of the respective L-profile 224 protrudes perpendicularly from the third flat piece 220 and wherein a second limb 228 of the respective L-profile 224 extends in parallel with the flat piece 220. The two second limbs 228 are directed towards one another and define therebetween a longitudinal slot 230 which is continuous in the vertical direction (in relation to the existing fagade).

Figure 9 shows a plan view of a fourth anchor bracket 24 according to a first embodiment of the invention. The fourth anchor bracket 24 comprises a fourth flat piece 240 with a cross-section which in this case is rectangular by way of example and is provided with two third circular holes 138 which are arranged in the edge region of the fourth flat piece 240 and are used for fastening to the fagade element 4 e.g. by means of screws. A fourth circular hole 139 which is provided in the centre of the fourth flat piece 240 serves to receive the threaded pin 262.

Finally, figure 10 shows the base plate 260, in which a fourth circular hole 139 is provided centrally in order to receive the threaded pin 262.

Figure 11-13 show an alternative embodiment of the fastening system 2. Figure 11 shows a perspective view of a fagade element 4 which is connected to an existing fagade (not illustrated) by means of a second component 20, according to an alternative embodiment. In this embodiment, the second component 20 is also configured to introduce substantially a wind suction load and wind pressure load into the existing fagade 6. The second component 20 contains a third anchor bracket 22 according to an alternative embodiment and contains a fourth anchor bracket 24 according to an alternative embodiment. Figure 12 shows a front view of the third anchor bracket 22 and figure 13 shows a perspective view of the fourth anchor bracket 24.

In the embodiment of the second component 20 of the fastening system 2 illustrated in figure 11 , the fourth anchor bracket 24 is arranged in an aperture 5 of the fagade element 4, preferably in an aperture 5 of a wooden frame element of the fagade element 4. The aperture 5 is oversized with respect to the fourth anchor bracket 24 in order to permit lateral displaceability in the positioning. The fourth anchor bracket 24 comprises a fourth flat piece 240 which, in this case however, is installed and oriented normally, i.e. perpendicularly to the existing fagade 6. The fourth flat piece 240 can be fastened to a wooden frame e.g. by means of annular ring shanked nails. As can be seen in figure 13, a screw receiver 242, e.g. in the manner of a screw nut, for the second bracket fastening means 26 is welded on the edge on the fourth flat piece 240.

In this embodiment, and in a manner not limiting for the invention, the second bracket fastening means 26 comprise a screw 266 which is screwed with a threaded portion in the screw receiver 242 (see figure 13) of the fourth anchor bracket 24.

The diameter of the screw head 268 is tailored to the profile of a Halfen rail 232 of the second anchor bracket 22. After installation, the screw head 268 clamps behind the two flange portions 233 of the Halfen rail 232 by means of a lock nut 270. On the front side, the screw 266 is secured with the lock nut 270, in particular against the effect of wind pressure. The Halfen rail 232 can also be referred in a routine manner in the art as an anchor rail. As an alternative to the screw 266, a threaded rod with washers and a lock nut can be used as described with reference to figure 7.

In the event that a lock nut 270 can be dispensed with, the screw 266 can be a headless screw (not illustrated) which is provided with a non-threaded portion in proximity to the screw head 268 for passage through the flange portions 233 of the Halfen rail 232 and with a threaded portion which can be arranged in the screw receiver 242.

The Halfen rail 232 and the further elements of the third anchor bracket 22 are illustrated in greater detail in figure 12. In this embodiment, the third anchor bracket 22 comprises a plurality of flat pieces 220 distributed preferably substantially equidistantly over the length of the Halfen rail 232 for lying against the existing fagade 6, but this is not limiting for the invention. Depending upon their function, the flat pieces 220 comprise supporting flanges 234 or fastening flanges 236. In the illustrated exemplified embodiment, in an advantageous manner but in a manner not limiting for the invention, two fastening flanges 236 are provided approximately centrally of the Halfen rail 232, each with third circular holes 138 for fastening to the existing fagade 6. In each case, at the upper end and lower end of the Halfen rail 232 two supporting flanges 234 are provided which protrude in both directions and advantageously stabilise the second component 20 under wind pressure loading. Within the scope of the invention, the number of flat pieces 220 is not limited and can comprise one, two, three, four, five or even more parts.

The invention is not limited to the exemplified embodiments described herein. On the contrary, a large number of modifications are apparent to a person skilled in the art within the scope of the claims.

REFERENCE SIGNS

2 fastening system; 4 fagade element; 5 aperture; 6 existing fagade; 10 first component; 12 first anchor bracket; 120 first flat piece; 122 support; 124 longitudinal web; 126 supporting portion; 128 receiver for web fastening means; 129 impact point for height adjustment means; 130 anchor piece; 132 elongate hole; 134 first circular hole; 136 second circular hole; 138 third circular hole; 139 fourth circular hole; 14 second anchor bracket; 140 second flat piece; 141 profile piece; 142 member to be supported; 144 transverse web; 146 receiver for height adjustment means; 148 spacer; 16 first bracket fastening means; 160 fastening bridge; 162 web; 164 web fastening means; 18 height adjustment means; 20 second component; 22 third anchor bracket; 220 third flat piece; 222 attachment profile; 224 L-profile; 226 first limb; 228 second limb; 230 longitudinal slot; 232 Halfen rail; 233 flange portion; 234 supporting flange; 236 fastening flange; 24 fourth anchor bracket; 240 fourth flat piece; 242 screw receiver; 26 second bracket fastening means; 260 base plate; 262 threaded pin; 264 lock nut; 266 screw; 268 screw head, 270 lock nut