WO2002040803A1

WO2002040803A1 - Device and method for fixing a roof sealing strip

Info

Publication number: WO2002040803A1
Application number: PCT/EP2001/013126
Authority: WO
Inventors: Hans-Jürgen Koch
Original assignee: Koch Hans Juergen
Priority date: 2000-11-16
Filing date: 2001-11-13
Publication date: 2002-05-23
Also published as: AU2002216036A1; DE50112137D1; EP1334249A1; EP1334249B1; ATE355426T1; EP1207243A1

Abstract

The invention relates to a device (1) for fixing a roof sealing strip (5) or the like, comprising a holding element (13) which is essentially plane on its underside (15) and comprises a central section (17) having a significantly larger thickness; and a fixing element (21) which penetrates the sealing strip (5) arranged below the holding element (13) and which fixes said sealing strip and the holding element to the substructure of the roof (3, 11). The fixing element (21) is a fixing screw (23) which comprises a threaded section (29) on its lower end region (25) for positively engaging with the substructure of the roof (11), and a threaded section (35) on its upper end region (33) for positively engaging with the holding element (13). The invention is characterised in that the holding element (13) comprises a central through opening (19) for positively receiving the upper end region (33) of the fixing screw (23), and the fixing screw (23) comprises an actuating device (37) on its upper end region (33), which can be actuated by means of an adapted tool. The inner diameter of the through opening (19) of the holding element (13) is smaller than the outer diameter of the upper threaded section (35) of the fixing screw (33), the upper threaded section (35) comprises a self-tapping screw thread, and the length of the upper threaded section (35) is shorter than the length of the central through opening (19).

Description

to attach a Dac al

description

The present invention relates to a device for fastening a roof waterproofing membrane or the like by means of a holding element and a fastening element to a roof substructure. Furthermore, the present invention relates to a method for fastening a roof waterproofing membrane or the like on a roof substructure.

Today, roof waterproofing membranes are widely used for roof structures of all kinds. These cover a thermal insulation layer, under which there is usually a vapor barrier layer. This structure is then supported by a corresponding supporting structure of the roof.

Disc-shaped holding elements in the form of holding plates are conventionally used to fix the roof sealing membrane or the entire roof covering structure from the various layers mentioned above. From DE 29 05 068 C2, for example, a device for fastening a sealing layer to a base is known, which has a holding plate which is fastened to the supporting structure of the roof with the aid of a fastening screw. For this purpose, the holding plate for receiving the fastening screw has a corresponding blind hole opening facing the roof skin, in which there is a threaded sleeve and into which the head of the fastening screw is screwed.

However, the device of the prior art has the disadvantage that the design of the holding element is very complex and expensive. The fastening screw used is also a special screw with an upper threaded section reaching to the end of the screw shaft, which must also be pre-assembled in the threaded sleeve. According to DE 29 05 068 C2, a specially designed, complex mounting device is also required for applying the fastening device. In addition, the exact position of the fastening screw is not visible from the outside, so that it is not recognizable whether the holding plate with the fastening screw has reached the desired end position, in which both the sealing membrane is fixed to the roof substructure, and a corresponding sealing effect is achieved or not.

From US 4,959,938 a device for fastening a roof sealing membrane is known, with a substantially flat holding element on its underside, which has a significantly larger thickness central portion, and a fastening element which penetrates the sealing membrane lying under the holding element and this and the holding element fixed to the roof substructure, the fastening element being a fastening screw which has a threaded section on its lower end region for positive engagement in the roof substructure and a threaded section on its upper end region for positive engagement with the holding element.

However, this prior art is disadvantageous in that it cannot be used for application to a roof waterproofing membrane applied to the top of a thermal insulation layer of a flat roof construction, since it would penetrate this roof waterproofing membrane due to its geometrical configuration and thus make it impossible to close the roof structure tightly to the weather side ,

The present invention is therefore based on the object of providing an apparatus and a method for fastening a roofing membrane or the like to a roof substructure which has an extremely simple construction, produces a secure seal and can be installed very easily.

This object is achieved by the features of claim 1 and claim 10.

According to the present invention, the holding element has a central through opening for the positive reception of the upper end region of the fastening screw and the fastening screw on the upper end region Actuating device which can be actuated by means of a suitable tool, the inside diameter of the through opening of the holding element being smaller than the outside diameter of the upper threaded section of the fastening screw and the upper threaded section having a self-tapping thread, the length of the upper threaded section being shorter than the length of the central through opening is.

It is thereby advantageously achieved that the device according to the invention for fastening a roof waterproofing membrane, which is formed from only two elements, one of which, namely the holding element, can be easily manufactured and the other, namely the fastening screw, can be a commercially available standard element, can be applied particularly easily and effectively to the roof waterproofing membrane. The device according to the invention is thus particularly simple and is composed of elements which can be produced or obtained particularly inexpensively. In particular, it is also ensured that the threaded section does not unnecessarily enlarge the passage opening of the roof sealing membrane or a defined contact surface on the shaft of the screw is reached in an area in which there is no thread, which leads to an increase in the tightness of the device against external weather influences.

The actuating device is preferably designed in the form of an external hexagon and an annular contact flange is provided between the external hexagon and the upper threaded section of the fastening screw, by means of which an extremely uniform power transmission on the one hand and an increased sealing effect on the other hand is achieved.

Alternatively, the actuating device can be designed in the form of a screw countersunk head which can be screwed into a complementary section in the holding element. This advantageously ensures that the fastening screw does not protrude beyond the holding element.

If the countersunk head has a slot or an internal recess, such as a square or hexagon, the fastening screw can be easily screwed in and loosened again. The actuating device can also advantageously be designed in the form of a head which has an essentially flat surface and a ring provided with notches between the screw shaft and the flat surface.

Furthermore, the upper side of the central section of the holding element is advantageously flattened, as a result of which a flat contact of the head section of the fastening screw on the holding element is advantageously achieved. This advantageously also creates the possibility of introducing additional sealing devices, for example in the form of liquid film, adhesive or sealing washer.

In an advantageous further embodiment of the device according to the invention, the through opening of the holding element is widened from the top, in such a way that the head portion of the fastening screw is partially or preferably completely accommodated in the widening. In particular, this has the advantage that the head portion of the fastening screw does not protrude beyond the holding element and thus increases safety against possible accidents.

Advantageously, the expansion can be poured out with sealing material, which ensures its secure sealing against the ingress of weather influences, such as rainwater in particular. In addition, corrosion protection of the fastening screw is created.

Advantageously, a sealing cap can alternatively be introduced into the widening, for example clamped or screwed in, so that a secure seal is outstandingly guaranteed over a long time.

The possibility of applying additional elements in the widening can lead to the particular advantage that the sealing element has additional holding elements, for example securing elements for roof catching devices, in particular when using the fastening device not only on flat surfaces. but also on sloping roofs.

The present invention also includes a method for fastening a roof waterproofing membrane or the like to a roof substructure, the method comprising the following steps according to the invention:

Applying a point, ring or partial ring of liquid film or adhesive to the roofing membrane around the predetermined fixing point,

Placing a holding element which is essentially planar on its underside and which has a clearly larger thickness central section in which there is a through opening,

- Inserting a fastening screw into the through opening and screwing in the fastening screw in such a way that first a threaded section having a lower end region of the fastening screw penetrates through the roof sealing membrane into the roof substructure in order to screw into the intended roof element, and then an upper end region having a threaded section screws the through opening of the holding element until a sufficiently large contact pressure of the holding element against the roof substructure has been set by the abutting head portion of the fastening screw, the outer diameter of which is larger than the inner diameter of the through opening of the holding element.

In this way, extremely simple assembly, with the realization of a secure sealing of the roof outer skin, is advantageously achieved to the outside, an exact end positioning or alignment of the holding element to achieve its function being no longer necessary, in particular when the holding element is designed as a holding plate. In other words, the holding plate, which at least partially rotates when it is applied, can assume any final assembly position and forms a secure seal in this final assembly position, as can only be achieved in the prior art by complex measures of both constructive and assembly-related types is. Furthermore, there is the great advantage that the fastening device according to the invention is suitable for automatic machines, that is to say it can be applied to the roof using existing automatic applicators and screwers.

It is particularly advantageous that the holding element is rotated as a result of the engagement of the upper end region of the fastening screw, when the liquid film or the adhesive comes into contact, this is distributed substantially uniformly at least in an annular manner in the circumferential direction, so that a reliable sealing of the separating surface between the holding element and roof waterproofing membrane is guaranteed.

Advantageously, in particular in the case of polystyrene roof insulation, a rubber or silicone disc is used between the holding element and the roof sealing membrane, as a result of which a good seal is achieved which is adapted to the insulating material.

Further details, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. It shows:

1 shows a section through an assembled fastening device in a first embodiment of this device.

2 shows a schematic representation of different distribution zones of the fastening device according to the invention on a flat roof shown in the example;

3 shows a second embodiment of the fastening device according to the invention in a sectional view;

4 shows a third embodiment of the fastening device according to the invention in a sectional view; and 5 shows a fourth embodiment of the fastening device according to the invention in a sectional view;

In the following detailed description of exemplary embodiments, identical parts are designated with the same reference numbers.

In Fig. 1, a fastening device 1 according to the invention is shown in a sectional view. The fastening device 1 is used to fasten a roof waterproofing membrane 5 of a roof substructure 3, the roof waterproofing membrane 5 in a known manner being a plastic membrane layer, a bitumen membrane or also an unclad or laminated sheet metal membrane.

Below the roof waterproofing membrane 5 there is a thermal insulation layer 7, for example made of a suitable thermal insulation material, below which in turn there is a film layer 9 which serves, for example, as a vapor barrier.

The roof waterproofing membrane 5, the heat insulation layer 7 and the film layer 9 rest on a supporting structure 11 of the roof.

The fastening device 1 is provided to fix the roof waterproofing membrane 5 on the one hand and the layers 7 and 9 lying underneath on the support structure 11. This has a holding element 13, which in the example shown is plate-shaped and whose underside 15 is essentially flat.

The holding element 13 has a central section 17 which has a considerably greater thickness than the thickness of the remaining holding element 13.

A through opening 19 is located centrally in this central section 17 and extends from the upper side 14 of the holding element 13 to the lower side 15 thereof.

In Fig. 1 the fastening device is shown in the assembled state. To fix the holding element 13, a fastening element 21 is provided, which in the example shown is a conventional fastening screw 23. The Fastening screw 23 has a lower end region 25, which has a tip 27 and a threaded section 29. The threaded section 29 is designed as a self-tapping thread, which comes into engagement with the support structure 11 when the fastening screw 23 is screwed in.

In the upper end region 33 of the fastening screw 23 or on its shaft 31, a threaded section 35 is provided which has an external thread, the outside diameter of which is larger than the inside diameter of the through opening 19. In addition, the threaded section 35 is designed as a self-tapping thread which is formed during screwing in the fastening screw 23 cuts itself into the inner wall of the through opening 19.

1, the length of the threaded section 35 is less than the length of the through opening 19, so that the threaded section 35 does not penetrate into the roof sealing membrane 5.

The upper end region 33 of the fastening screw 23 also has an actuating device 37, which in the example shown is designed as an external hexagon 39.

Between the external hexagon 39 and the threaded section 35 there is preferably a contact flange 41, the external diameter of which, as can be seen in FIG. 1, is somewhat larger than the external contour of the external hexagon 39.

Although the contact flange 41 already forms a good sealing option in addition to the normally self-sealing threaded section 35 in the through opening 19, additional sealing measures, for example in the form of sealing rings or further liquid foils or adhesive 43, can be provided. This elastic seal has the particular advantage of compensating for expansion of the fastening screw 23 due to different thermal expansions. Because the fastening screw 23 consists essentially of metal, whereas the holding element 13 consists essentially of plastic. The different materials have different coefficients of thermal expansion, so that the different expansions of the two materials can be caught stisch by the sealing devices 43.

In the assembled state of the fastening device 1, a liquid film or an adhesive 45 is furthermore provided in a punctiform, ring-shaped or partially ring-shaped manner between the underside 15 of the holding element 13 and the top of the roof sealing membrane. This advantageously does not extend inwards to the passage area of the fastening screw, however, accidental penetration of the liquid film 45 into this area is harmless, or is prevented in the case of polystyrene by an additional sealing washer.

The method according to the invention for fastening a roof waterproofing membrane will now be described below.

First, a point, ring or partial ring of liquid film or adhesive 45 is applied to the roof waterproofing membrane 5. This takes place around the fixed fixing point, as will be described below. Subsequently, the holding element 13 is placed with its underside 15 on the liquid film or the adhesive 45, the through opening 19 of which essentially lies on the fixed fixing point.

The fastening screw is then inserted through the passage opening 19, penetrates through the roof sealing membrane 5 and also through the thermal insulation layer 7 and the film layer 9. Then the lower threaded section 35 begins to screw into the support structure 11 by continuously turning the fastening screw through the preferably self-tapping thread.

When the upper threaded section 35 reaches the top 14 of the holding element 13 or the through opening 19, it also begins to screw into the through opening 19. The holding element 13 can initially rotate somewhat, as a result of which the liquid film or the adhesive 45 is distributed evenly or more uniformly over the circumference of the ring.

Through the lower threaded portion 29, the fastening screw 23, however moved downwards overall, so that the contact pressure becomes so great that the holding element 13 no longer moves and the screw 23 is completely screwed with its upper threaded section 35 into the through opening 19 until the contact flange 41 on the upper side 14 of the holding element 13 comes to lie. If necessary, it also meets a seal, for example in the form of a liquid film 43.

2 shows an example of the distribution of fastening devices on a roof. FIG. 2 schematically shows the top view of a roof surface D which has a main surface region 51 which extends over the central regions of the roof surface 50. Furthermore, edge regions 52 are specified which extend in a strip-like manner parallel to the outer sides of the roof surface 50 and corner regions 53 which extend in the corner regions of the roof surface 50.

The distribution of the fastening device 1 in the respective areas can, for example, be such that 1.2 pieces / m ² are used in the main surface area 51, 2.4 pieces / m ² in the edge areas 52 and 3.8 pieces / m in the corner areas 53 ^2nd A corresponding number of fixing points are provided and, if necessary, pre-marked in advance of the mounting of the fastening device 1.

The fastening device 1 of the present invention can be used in all areas of a film roof, so that logistically it can also be avoided to provide different fastening devices for different roof surface areas, which in turn accelerates the mounting of the fastening devices.

3 shows a second embodiment of a holding element 13. In contrast to the embodiment according to FIG. 1, the through opening 19 has in its upper region an expansion 47 which is so large in diameter that it can accommodate the head portion of the fastening screw 23 with an external hexagon 39 and contact flange 41. Furthermore, the depth of the widening 47 is such that the head portion of the fastening screw 23 can completely disappear therein, and a liquid film 49 can be poured into the widening 47 to completely seal the widening from the outside, and thus this be poured out. The overall dimensioning of the holding element 13 is adapted accordingly to this embodiment.

4 shows a third embodiment of the device according to the invention. In the middle section 17, a funnel-shaped opening 55 is provided, which serves to receive a countersunk head 57, which forms the upper end of the fastening screw 23. The fastening screw has an inner recess 59 in the area of its upper end, into which a suitable tool for screwing in or unscrewing the fastening screw 23 can engage. For example, the inner recess can be an inner square or hexagon.

FIG. 5 shows a fourth embodiment of the device 1 according to the invention. It differs from the embodiment of FIG. 4 only in that, instead of the inner recess 59, a slot 61 is provided in the screw head 57 of the fastening screw 23.

In order to ensure an exact or flawless assembly of the device according to the invention, measures can be taken to prevent the fastening screw from being screwed in too tightly or too far. For example, the fastening screw can be screwed in and / or tightened using a torque wrench. A depth limiter known in the prior art can also be used.

The present invention thus provides a simple device for attaching a roof sealing sheet to a roof structure and a correspondingly simple method for attaching the roof sealing layer, which has particular advantages in terms of simplicity in design, simplicity in assembly and thus considerable cost advantages.

The fastening device according to the invention can advantageously be applied to all types of roofs. This also includes vertical or even overhanging roofs, for example barrel-shaped roofs. Facades of buildings are also included. Another important advantage of the present invention is the recyclability of the fastening device, in particular if the holding element is made of plastic. For example, in the case of the embodiment according to FIG. 1, only the fastening screw has to be loosened again and the roof sealing layer in the area can be removed together with the holding element 13. The embodiment of the prior art mentioned at the outset, in which the threaded sleeve is also cast into the holding plate, considerably complicates the recycling ability of the holding plate or even prevents it altogether.

The present invention is not limited to the exemplary embodiments shown. For example, instead of liquid film, adhesive or sealing compound, a sealing disk adapted to the geometry, for example made of compressed foam material, can be used.

Furthermore, the fastening device according to the invention can be used in support substructures of all kinds, that is to say also in those in which concrete, aerated concrete or wood-based materials are present instead of trapezoidal sheets. The lower threaded section 29 of the fastening screw 23 then has a thread that is suitable for the respective material of the roof substructure, or a corresponding dowel is additionally used.

Claims

claims

1. Device (1) for fastening a roof sealing membrane (5) or the like with a holding element (13) which is essentially planar on its underside (15) and has a central section (17) having a significantly greater thickness, and a fastening element (21) which penetrates the sealing sheet (5) lying under the holding element (13) and fixes this and the holding element to the roof substructure (3, 11), the fastening element (21) being a fastening screw (23) which is attached to its lower end region (25 ) has a threaded section (29) for positive engagement in the roof substructure (11) and at its upper end region (33) a threaded section (35) for positive engagement with the holding element (13), characterized in that the holding element (13) has a Central through opening (19) for the positive reception of the upper end region (33) of the fastening screw (23), and the fastening screw (23) on her Upper end region (33) has an actuating device (37) which can be actuated by means of a suitable tool, the inner diameter of the through opening (19) of the holding element (13) being less than the outer diameter of the upper threaded section (35) of the fastening screw (33) and the upper threaded section (35) has a self-tapping thread, the length of the upper threaded section (35) being shorter than the length of the central through opening (19).

2. Apparatus according to claim 1, characterized in that the actuating device (37) is designed in the form of an external hexagon (39) and between the external hexagon (39) and the upper threaded portion (35) of the fastening screw (23) an annular contact flange (41) is provided ,

3. Apparatus according to claim 1, characterized in that the actuating device (37) in the form of a screw countersunk head (57) which can be screwed into a complementary section (55) in the holding element (13).

4. The device according to claim 3, characterized in that the screw countersunk head (57) has a slot (61) or an inner recess (59) so that the screw countersunk head can be screwed in or out with an appropriate tool.

5. The device according to claim 1, characterized in that the actuating device (37) is designed in the form of a head which has a substantially flat surface and a ring provided with notches between the screw shaft (31) and the flat surface.

6. Device according to one of claims 1 to 5, characterized in that the top (14) of the central portion (17) of the holding element (13) is flattened.

7. Device according to one of claims 1 to 4, characterized in that the through opening (19) of the holding element (13) from the top (14) to accommodate the actuating device (37) of the fastening screw (23) is widened.

8. The device according to claim 7, characterized in that the expansion (47) after inserting the fastening screw (23) with liquid film or adhesive or sealing compound (49) is poured out.

9. The device according to claim 7, characterized in that the fastening device has a sealing cap which is clamped or screwed into the widening (47).

10. A method for fastening a roof waterproofing membrane (5) or the like on a roof substructure (3), with the following steps:

Application of a point, ring or partial ring of liquid film or Adhesive (45) on the roof waterproofing membrane (5) around the predetermined fixing point,

Placing on its underside (15) an essentially flat holding element (13), which has a significantly larger thickness central section (17) in which there is a through opening (19),

Inserting a fastening screw (23) into the through opening (19) and screwing the fastening screw (23) in such a way that first a threaded section (29) has a lower end region (25) of the fastening screw (23) through the roof sealing membrane (5) into the roof substructure (3) penetrates in order to screw into the provided roof element (11), and then an upper end region (33) with a threaded section (35) screws into the through opening (19) of the holding element (13) until it reaches through the abutting head section (37, 39, 57) of the fastening screw (23), the outer diameter of which is larger than the inner diameter of the through opening (19) of the holding element (13), a sufficiently large contact pressure of the holding element (13) against the roof substructure (3) is set Has.

11. The method according to claim 10, characterized in that by the engagement of the upper end region (33) of the fastening screw (23) of the holding element (13) is rotated and by touching the liquid film or the adhesive (45) this is substantially uniformly distributed at least annularly ,

12. The method according to claim 10 or 11, characterized in that in particular with a roof insulation (7) made of polystyrene, a rubber or silicone disc between the holding element (13) and roof sealing membrane (5) is used.