Fastening System for Large-Area Metal Roof Coverings or Wall Claddings

Abstract

The invention relates to a fastening system for large-area roof coverings or wall claddings.

The object is to create a fastening system which is structurally simple, consists of few parts, is fast to install and is suitable for high negative wind loads.

Fastening is achieved within two upwardly projecting longitudinal ribs 2, which are formed by upwardly projecting sheet metal flanks 11. These sheet metal flanks 11 are bent up and provided with projections 13. According to the invention, T-shaped base bars 3 are disposed and fastened within the upwardly projecting longitudinal ribs 2, either continuously or only in some places. The horizontal wide limb of the T-shaped base bars 3, designated as foot limb 5, can be disposed upwardly or downwardly. The T-shaped base bar 3 has recesses 6 formed left and right in the vertical limb of the T-shaped base bar 3 and reaching into the foot limbs 5. Specially formed projections 13 of the sheet metal flanks 11 of the roof elements, sheet metal plates or sheet metal strips 1 engage in these recesses 6. These preformed projections 13 result in a form-fitting joint in conjunction with press plates 9 that can be disposed at or on the central limb 4. The press plates 9 are appropriately fastened with the base bar head 7 in a form-fitting manner or, for example, with screws. The press plates 9 are formed such that the press plates 9 span over the projections 13 of the sheet metal flanks 11 of the roof elements, sheet metal plates or sheet metal strips 1 positioned side by side. This creates a durable form-fitting joint by means of the T-shaped base bar 3 (or base element), central limb 4 and press plate 9. At the upper ends of the upwardly projecting lateral sheet metal flanks 11, the whole longitudinal rib is closed towards the top with a cover strip 12.

Claims

1. A fastening system for large-area metal roof coverings or wall claddings for the fastening of sheet-like roof elements, sheet metal plates or sheet metal strips positionable side by side on roof or wall substructures, wherein the roof elements, sheet metal plates or sheet metal strips are designed flat or corrugated or profiled, fastened by means of upwardly projecting longitudinal ribs formed by upright sheet metal flanks and the longitudinal ribs are distributed across the roof covering or wall cladding in parallel or at an angle relative to each other, characterized in that T-shaped base bars (3) are disposed and fastened in a longitudinal direction within the upwardly projecting longitudinal ribs (2) on the roof or wall substructure, recesses (6) are formed in the T-shaped base bars (3) left and right on the central limbs (4) and reach down to the foot limbs (5), projections (13) of the sheet metal flanks (11) of the roof elements, sheet metal plates or sheet metal strips (1) engage in these recesses (6), press plates (9) are fastened to the central limb (4), with the press plates (9) spanning over the projections (13) of the sheet metal flanks (11) of the roof elements, sheet metal plates or sheet metal strips (1) positioned side by side and the sheet metal flanks (11) along the longitudinal ribs (2) being closed towards the top using a cover strip (12).

2. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the dimensions and shape of the projections (13) in the sheet metal flanks (11) correspond with the dimensions and shapes of the recesses (6) in the central limb (4) and in the foot limbs (5) of the T-shaped base bars (3).

3. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the two recesses (6) in the central limb (4) and in the foot limbs (5) are formed symmetrically.

4. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the two recesses (6) in the central limb (4) and in the foot limbs (5) are formed as a dovetail, oval or circular cross-section.

5. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that reinforcement bars (14) are additionally disposed in the projections (13) of the sheet metal flanks (11).

6. The fastening system for large-area roof coverings or wall claddings according to claim 5, characterized in that the dimensions and the cross-sectional shape of the reinforcement bars (14) are matched with the dimensions and cross-sectional shape of the recesses (13) of the sheet metal flanks (11) and of the press plates (9).

7. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that press plates (9) fastened to the central limb (4) are screw-fastened to the base bar head (7) at appropriate intervals by means of headed screws (10).

8. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the T-shaped base bars (3) are fastened with the roof or wall substructure by means of base screws (8) arranged in a staggered or pairwise manner.

9. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the T-shaped base bars (3) and/or the press plate (9) are formed as profile rails.

10. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the cover strip (12) is joined to the sheet metal flanks (11) by means of a form-fitting folded seam oint.

11. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the T-shaped base bars (3) and the press plates (9) are disposed inversely and both are fastened to the roof or wall substructure by means of a central through-going fastening screw (15).

12. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the reinforcement bars (14) consist of stainless steel, aluminium, plastic materials or rubber materials.

13. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the reinforcement bars (14) are formed of different materials.

14. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that the reinforcement bars (14) are formed with linear, helical or locally disposed protrusions (17).

15. The fastening system for large-area roof coverings or wall claddings according to claim 1, characterized in that instead of the inserted reinforcement rods (14), continuous ropes or ropes drawn in under tension and relaxing into place are disposed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention shall be explained in detail in one exemplary embodiment by reference to FIGS. 1 to 4.

[0028] FIG. 1 shows the cross-section through a fastening system according to the invention within a longitudinal rib 2 with pairwise screw fastening of the T-shaped base bar 3 to a roof or wall substructure (not drawn).

[0029] FIG. 2 shows a fastening system with inserted reinforcement bars 14.

[0030] FIG. 3 shows a fastening system with a screw-fastened press plate 9 having a specially designed base element head 7.

[0031] FIG. 4 shows a wide design with a T-shaped base bar 3 arranged in top position and screw-fastened in a through hole and secured by means of a pair of inserted reinforcement bars 14 having protrusions 17 on them.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] FIG. 1 shows the cross-section through a preferred embodiment of a fastening system according to the invention within a longitudinal rib 2 with symmetric pairwise screw-fastening by two base screws 8 of the T-shaped base bar 3 on a roof or wall substructure not depicted in the drawing. The base bar head 7 as the end of the central limb 4 of the T-shaped base bar 3 is complementary to a connection recess with a T-shaped undercut in the press plate 9, also designed in a T-shape. The T-shaped base bar 3 is screw-fastened to the roof or wall substructure with its wide upper bar down. The large upper bar then forms the left and right foot limbs 5 which are recessed in an almost semi-circular shape. The central limb 4 is straight and the base bar head 7 is T-shaped. Instead of the T-shaped joining solution between the base bar head 7 and the press plate 9, a dovetail joint may be designed. This has advantages during installation because the press plate 9 is pushed over the base bar head 7 from the front side. The press plate 9 also has almost semi-circular recesses formed left and right and open towards the bottom. In this way, an almost oval recess 6 is produced. After the T-shaped base bars 3 have been fastened to the roof or wall substructure using the base screws 8, the two preformed roof elements, sheet metal plates or sheet metal strips 1 are inserted left and right into the T-shaped base bars 3. The roof elements, sheet metal plates or sheet metal strips 1 are provided with almost oval projections 13 designed in continuation to a double bend. This is of advantage, ensuring that the two flat portions of the left and right roof elements, sheet metal plates or sheet metal strips 1 can rest on the roof or wall substructure over the full flat area to the greatest possible extent.

[0033] As a rule, this is a beam, joist or girder construction because such roof coverings are not installed on planar substructures. The shapes and positions of the projections 13 correspond in their dimensions and cross-sections with the dimensions and cross-sections of the recesses 6. The roof elements, sheet metal plates or sheet metal strips 1 continue upwards as sheet metal flanks 11 that project upwardly at a right angle. When the roof elements, sheet metal plates or sheet metal strips 1 have been inserted into the T-shaped base bars 3 or base elements, the press plates 9 are slid onto them in a suitable manner from the front side. When the roof elements, sheet metal plates or sheet metal strips 1 are now fixed within the longitudinal ribs 2, a continuous cover strip 12 is installed at the upper end of the sheet metal flanks 11 by making a folding seam. This is done automatically by means of a suitable folding machine. The longitudinal rib 2 is thereby closed in a climate-proof manner and a permanent, mechanically secure fastening to the roof or wall substructure is produced.

[0034] FIG. 2 shows an equivalent embodiment of a fastening system for large-area metal roof coverings or wall claddings, as already described above in FIG. 1. However, reinforcement bars 14 are additionally inserted or slid into the recesses 6 left and right. For particular designs of the roof coverings, it may be sufficient that a reinforcement bar 14 is inserted or slid in only on one side. Here, these reinforcement bars 14 are almost of an oval design and their dimensions and cross-sections correspond with the projections 13 of the roof elements, sheet metal plates or sheet metal strips 1. This improves the strength of the construction considerably. Depending on the dimensioning of the reinforcement bars 14, the mechanical stability at the bottom in the area of the stable roof or wall substructure can be freely adjusted by appropriately larger or smaller cross-sections being pre-inserted or slid in posteriorly. Thus, the security against negative wind loads is considerably improved. Preferably the cross-sections of the reinforcement bars are matched with the cross-sections of the projections 13. This prevents the relatively thin-walled sheet metal roof elements, sheet metal plates or sheet metal strips from deforming with time under the acting forces and the form-fitting joint from being lost. The replacement bars 14 produce a force-locking, permanent joint immediately in the area of the planar roof covering (roof tile).

[0035] FIG. 3 shows a fastening system for large-area metal roof coverings or wall claddings for fastening sheet-like roof elements, sheet metal plates or sheet metal strips 1 positionable side by side in an embodiment with screw-fastening of the press-plate 9 with a base element head 7 specially shaped for screw-fastening. All other design details are equivalent to the technical embodiment as described under FIG. 1. Here, the base bar head 7 is specially reinforced and enlarged and inside a cavity is disposed such that, here for example, the press plates 9 are simply joined with the T-shaped base bar 3 via the central limb 4 using a self-tapping headed screw 10. This base bar is in turn fastened to the roof or wall substructure not shown by means of two self-tapping base screws 8 used in pair. This advantageous embodiment can be installed faster on the site because the press plates 9 need not be slid in from the front side but can be fitted and screw-fastened from the top.

[0036] FIG. 4 shows a wider embodiment of a fastening system for large-area roof coverings or wall claddings. In this case, the T-shaped base bar 3 and the press plate 9 are in an inverse arrangement as compared with the previous arrangements, i.e. the press plate 9 is disposed at the bottom directly on the roof or wall substructure. Then the preformed roof elements, sheet metal plates or sheet metal strips 1 are placed together with pre-inserted reinforcement bars 14, then the T-shaped base bar 3 is inserted from the top and screw-fastened to the roof or wall substructure together with press plate 9 underneath by means of a through-going fastening screw 15. To improve the stability of this wide roof covering embodiment, two reinforcement bars 14 are inserted here again on the left and right. These may be slid in posteriorly, but are generally already inserted before the T-shaped base bars 3 are inserted in and fastened to the projections 6 of the roof elements, sheet metal plates or sheet metal strips 1. Thus, the negative wind loads or other acting forces cannot lead to any deformations of the roof covering and roof tiles. The reinforcement bars 14, which are made of two materials here, have special protrusions 17 gripping into the material of the roof elements, sheet metal plates or sheet metal strips 1 and permanently preventing slippage of the reinforcement bars 14. The technical solution described above is primarily usable as a fastening system for large-area metal roof coverings or wall claddings for the fastening of sheet-like roof elements, sheet metal plates or sheet metal strips positionable side by side on roof or wall substructures.

LIST OF REFERENCE NUMERALS

[0037] 1 Roof elements, sheet metal plates or sheet metal strips [0038] 2 Longitudinal ribs [0039] 3 T-shaped base bars, base elements [0040] 4 Central limb [0041] 5 Foot limb [0042] 6 Recesses [0043] 7 Base bar head [0044] 8 Base screws [0045] 9 Press plates [0046] 10 Headed screw [0047] 11 Sheet metal flank [0048] 12 Cover strip [0049] 13 Projections [0050] 14 Reinforcement bars [0051] 15 Through-going fastening screw [0052] 16 Folded seam joint [0053] 17 Protrusions