CH711589A2

CH711589A2 - Dowels for mounting in a thermal insulation composite system.

Info

Publication number: CH711589A2
Application number: CH01281/16A
Authority: CH
Inventors: maag Stefan
Original assignee: Dosteba Ag
Priority date: 2015-09-29
Filing date: 2016-09-29
Publication date: 2017-03-31
Also published as: DE102016218880A1; CH711589B1

Abstract

The invention relates to a dowel (11) for fastening in a heat insulation composite system (WDVS) with a hollow shaft (13), having a first and second end (15, 17) and a sealing region (19) at the second end (17) Which can be held frictionally in a borehole of the plaster layer of the ETICS. The sealing region is realized by a sealing element (19) arranged at the second end (17).

Description

FIELD OF THE INVENTION The invention relates to a dowel according to the preamble of claim 1, a set of a dowel and an inserting aid according to claim 19 and a method for fastening an anchor according to the preamble of claim 20.

PRIOR ART [0002] Various attachments are known from the prior art for attaching objects to a thermal insulation composite system (ETIC) without the attachment projecting into the support layer lying behind the ETICS. Accordingly, such attachments are only suitable for moderately heavy objects, as the load-bearing capacity limits are set by the strength of the ETICS, ie by the plaster layer and the thermal insulation behind it.

[0003] Known are, for example, so-called screw dowels or insulating dowels, which have a thread pitch which increases greatly from the tip. However, such dowels cause a comparatively large damage in the plaster layer. Furthermore, the sealing of the plaster layer is not satisfactory with respect to external weathering influences.

[0004] Stopping systems are also known which, by means of a special hot-air device, melt a cavity into the thermal insulation following the plaster layer. This cavity is sprayed with an injection mass, whereby an adhesive collar is formed behind the plaster layer. However, the production of the cavity is very complex. In addition, a separate hot air unit must be purchased. This system also works only with fusible thermal insulation.

DE 10 2011 002 165 A1 discloses an expansion dowel for an ETIC, which is spread in the heat-insulating layer and behind the cleaning layer of the ETICS is backlash-free. As a result, the expansion dowel uses the strength of the plaster layer and the connection of the plaster layer to the thermal insulation for a fastening. However, since the expansion dowel can only slightly conceal the plaster layer, the load-bearing capacity is low.

SUMMARY OF THE INVENTION The object of the present invention is to develop a fastening according to the present invention on a heat insulation composite system which is to be carried out quickly and with the least possible damage to the plaster layer and has an improved load bearing capacity and sealing against the thermal insulation ,

Description: [0007] Dowels for fastening in a heat insulation composite system have a hollow shaft, into which a screw can be screwed. The shank has first and second ends. A sealing region is provided at the second end of the shank, so that no moisture can penetrate into the WDVS in the region of the dowel. The sealing region can be realized by a sealing element arranged at the second end. This sealing element allows pressure build-up in the thermal insulation around the dowel without the borehole acting as a leak. This seal is used to allow a 1- or a 2-component adhesive to penetrate deep into the thermal insulation. Therefore, open-cell or porous materials, for example expanded polystyrene or mineral wool, In which the adhesive can penetrate more easily. Preferably, the sealing element is therefore designed to seal the borehole against an overpressure by means of a liquid adhesive. The overpressure of the adhesive in the ETICS is produced by injection into the plug, for example with a cartridge press. The adhesive, which is injected through the dowel, can not escape through the drill hole back out of the ETICS, but must penetrate into the thermal insulation. It has been found that sufficient oxygen is present in the open-pore thermal insulation to cure a 1-component adhesive. The 2-component adhesive cures without the presence of oxygen in the thermal insulation. In order to seal the borehole against a liquid adhesive with an overpressure. The overpressure of the adhesive in the ETICS is produced by injection into the plug, for example with a cartridge press. The adhesive, which is injected through the dowel, can not escape through the drill hole back out of the ETICS, but must penetrate into the thermal insulation. It has been found that sufficient oxygen is present in the open-pore thermal insulation to cure a 1-component adhesive. The 2-component adhesive cures without the presence of oxygen in the thermal insulation. In order to seal the borehole against a liquid adhesive with an overpressure. The overpressure of the adhesive in the ETICS is produced by injection into the plug, for example with a cartridge press. The adhesive, which is injected through the dowel, can not escape through the drill hole back out of the ETICS, but must penetrate into the thermal insulation. It has been found that sufficient oxygen is present in the open-pore thermal insulation to cure a 1-component adhesive. The 2-component adhesive cures without the presence of oxygen in the thermal insulation. Which is injected through the dowel, can not escape through the drill hole back out of the ETICS, but must penetrate into the thermal insulation. It has been found that sufficient oxygen is present in the open-pore thermal insulation to cure a 1-component adhesive. The 2-component adhesive cures without the presence of oxygen in the thermal insulation. Which is injected through the dowel, can not escape through the drill hole back out of the ETICS, but must penetrate into the thermal insulation. It has been found that sufficient oxygen is present in the open-pore thermal insulation to cure a 1-component adhesive. The 2-component adhesive cures without the presence of oxygen in the thermal insulation.

[0008] The object of a dowel according to the invention is achieved by providing at least one outlet opening at the second end of the shank. This position of the outlet opening allows the adhesive to penetrate very deeply into the thermal insulation just below the plaster layer, since at the beginning the pressure of the injected adhesive is greatest. Once the adhesive has penetrated into the thermal insulation, the adhesive hardens and forms an adhesive collar in the thermal insulation. The adhesive collar prevents the anchor from tearing out from the ETICS and stabilizing it in its position. The position of the at least one outlet opening makes it possible for the adhesive collar to form particularly wide behind the plaster layer.

Since the at least one outlet opening is preferably provided at a short distance from the sealing element at the second end, the pressure with which the adhesive enters the thermal insulation at the transition from the plaster layer to the thermal insulation is greatest, and the penetration depth is in the range This area is the largest. The adhesive forms around the dowel a substantially conical adhesive collar. As a result, the plug is firmly anchored in the ETICS.

[0010] A plurality of outlet openings is preferably arranged on the circumference of the second end. Preferably, the outlet openings are arranged symmetrically along the circumference of the dowel. As a result, the adhesive can penetrate as uniformly and rotationally symmetrically as possible into the thermal insulation.

[0011] The invention is characterized in that the density element and the shaft are made of different plastics, the density element preferably being made of a thermoplastic elastomer. The shaft provides the necessary stability for the dowel, while the density element is elastic enough to seal the borehole in the region of the plaster layer against leakage of adhesive. The density element can also be made of a rubber material. The shaft and its tip are preferably injection-molded from a glass-fiber-reinforced polyamide.

[0012] It has proved to be expedient if an inlet opening penetrating the sealing element in the longitudinal direction is provided on the sealing element, in which a closure is formed. The closure prevents adhesive from leaking from the plug once it is completely injected into the ETICS.

In a particularly preferred embodiment of the invention, the closure has the function of a valve in that it can be opened by an overpressure at the inlet opening and can be closed by an overpressure in the cavity of the stem. The closure therefore allows the adhesive to flow only in one direction, namely into the cavity of the shaft. An escape of the adhesive out of the cavity of the shaft prevents the closure.

[0014] The closure is expediently a membrane with at least one target fracture site. The membrane is injection molded together with the density element in one piece. The break points break when the adhesive is injected with pressure into the inlet opening. This allows several circular sectors to be folded in the direction of flow. Contrary to the direction of flow, the circular sectors can be hinged and close the sealing element when the adhesive injected into the thermal insulation is forced outwards. The membrane together with the density element prevents a once-injected adhesive from escaping from the ETICS. The desired breaking points can be arranged arbitrarily on the membrane, but are preferably crossed. It would also be conceivable that no deflection points are present on the diaphragm, Then, the diaphragm is formed as an inwardly oriented cone with a central injection hole. Due to the conical shape, the injection hole is pressurized by an adhesive present in the thermal insulation.

[0015] The density element is preferably injection-molded onto the second end. As a result, the sealing element is fixedly connected to the shaft and can no longer be released from it.

[0016] The invention is also preferably characterized in that the sealing element has a sealing region in the form of a truncated cone. As a result, the sealing element can be pressed against the borehole. Preferably, the front end of the truncated cone has a slightly smaller diameter than the borehole, and the rear end of the truncated cone has a slightly larger diameter than the borehole. As a result, a reliable seal between the borehole and the density element can be achieved by pressing in the sealing element.

[0017] Advantageously, the truncated cone has a height such that it can penetrate the plaster layer. This feature allows the borehole in the plaster layer to be in contact with the density element along its entire height and is thus very well sealed.

[0018] In a particularly preferred embodiment of the invention, a plurality of sealed hollow bodies is provided in the shaft. The closed cavities preferably extend along the longitudinal axis of the shank. The closed cavities act as a volume reduction of the shaft interior space whereby only one screw receptacle is permitted in the shank into which a screw can be screwed by cutting into the screw receptacle. Despite the cavities, the pulling force of the screw is ensured since the occurring forces Are not very large. However, it may be necessary that the dowels have to be drilled with larger screw diameters. The cavities are surrounded all around with dowel material so that the dowel is sufficiently stable, In order to be able to hold a screw reliably. Due to the volume reduction, no adhesive can penetrate the shaft, whereby the adhesive volume to be injected can be reduced.

[0019] In one embodiment of the invention, at least one vent is provided at the first end for the escape of the air present in the shaft. Consequently, no back pressure can build up inside the shaft and the shaft can be filled with low injection pressure. The ventilation is preferably realized by small air holes in the tip.

[0020] The first end may be formed as a tip, but is preferably a separate part which is connectable to the shaft. As a result, the shaft can be removed more easily than if it had a tip.

In a further embodiment of the invention, the outlet opening has internal dimensions between 1 mm and 5 mm, and preferably between 2 and 3 mm. The outlet opening may be circular, but may also have other shapes, for example those of an elongated slot. This dimensioning ensures a uniform distribution of the adhesive in the thermal insulation.

To reduce the filling volume of the shaft with adhesive, a plurality of longitudinal struts is provided on the inside of the shaft. A screw screwed into the dowel can cut into the longitudinal struts.

[0023] In a further preferred embodiment of the invention, a plurality of pull-out safety devices is formed on the outside of the shank. These pull-out safety devices can be webs or grooves oriented transversely to the longitudinal direction, at which the adhesive forms a positive connection with the plug. A further aspect of the invention relates to a set of a dowel according to the preamble description and an insertion aid with an indentation surface. According to the invention, the insertion aid has a process which can bridge the density element and can produce a direct connection of the indentation surface to the shaft. When the dowel is pressed into the ETICS, the damping element is free of compressive forces and is not deformed when the dowel is pressed into the borehole and can move freely.

[0024] Another aspect of the invention relates to a method for fastening an anchor in an ETICS. According to the invention, in the process, a liquid adhesive is injected into the shaft with such a pressure that it penetrates through the outlet openings into the heat insulation of the ETICS and prevents leakage of the liquid adhesive between the density element and the cleaning layer. The adhesive can spread out on the outer wall of the shaft because there is a lower flow resistance between the shaft wall and the insulation material than in the insulation material. The adhesive collar can therefore form along the entire length of the dowel. An adhesive collar is formed, which holds the plug positively under the plaster layer in the ETICS.

[0025] Further advantages and features will become apparent from the following description of two exemplary embodiments of the invention with reference to the schematic representations. In a scale which is not to scale,

FIG. 1 is an axonometric view of the anchor according to the invention;

FIG. 2: a longitudinal cross section through the dowel; FIG.

FIG. 3 is a plan view of a sealing element of the dowel; FIG.

FIG. 4: a detailed view of the dowel in the region of the sealing element; FIG.

FIG. 5 shows a longitudinal section through a first embodiment of the dowel; FIG.

FIG. 6: a longitudinal section through a second embodiment of the dowel; FIG.

FIG. 7 is an axonometric view of an insertion aid; FIG.

FIG. 8: a side view of the insertion aid and FIG

FIG. 9 is a longitudinal section through the dowel inserted into a thermal insulation with the adhesive collar formed and the screw screwed in. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figures, a dowel is shown, which is designated as a whole by reference numeral 11. The dowel 11 has a hollow shaft 13 with a first and second end 15, 17. The shank 13 is preferably produced in injection-molding technology from a plastic, for example a polyamide with glass fiber reinforcement. A density element 19 is arranged at the second end 17. The density element 19 is produced from an elastic plastic, for example a thermoplastic elastomer or a rubber type, and is preferably injection-molded on the second end 17 of the shaft 13. It is also conceivable for the sealing element to be positively fitted onto the second end 17 and thereby to be held on the latter. The first end 15 of the shank 13 can be shaped as a tip. For the simplified demoulding of the shaft 13, however, it is preferred that the tip 18 is a separate part which can be connected to the shaft. It is, for example, conceivable for the tip 18 to be clipped into the first end 15 by means of hooks.

The dowel 11 according to the invention is designed to be held on a heat insulation composite system. In the context of this application, a thermal insulation composite system (short ETIC) is to be understood as a façade insulation with an insulating material and a plastering layer. The insulating material is preferably a porous, open-pore material and is usually attached to an exterior wall structure. The plastering layer is a plaster layer, which is reinforced with a fabric.

The dowel 11 is inserted into a drill hole 21 bored at the ETICS. The borehole (21a, 21b) penetrates the plaster layer 23 and optionally the insulating material 25 (FIG. 5). As a matter of the invention, the density element 19 is able to seal the borehole 21a in the cleaning layer as liquidly as possible against the interior of the ETICS.

After the dowel 11 has been inserted into the WDVS, the cleaning layer 23 and the sealing elements 19 form a transition which is as liquid as possible. The sealing element 19 encloses an inlet opening 27 for a 1- or 2-component adhesive. A plug-in aid 29 is used for inserting the anchor 11 into the ETICS without deforming the density element 19 during insertion and thus impairing the density characteristics (FIGS. 7 and 8). The insertion aid 29 has an indentation surface 31 and a projection 33. The extension 33 is inserted into the inlet opening 27 and bridges the sealing element 19. The extension 33 then has contact with the second end 17. The compressive force which a user exerts on the indentation surface 31 can therefore be transmitted directly to the shaft 13.

[0030] In order to improve the sealing function of the sealing element 19, the sealing element 19 has the shape of a truncated cone. The height of the sealing element 19 is to be dimensioned in such a way that it penetrates the cleaning layer 19. This ensures that the bore hole 21a in the plaster layer 23 is sealed over the entire thickness of the plaster layer 23.

The adhesive is injected into the dowel 11 through the inlet opening. The adhesive penetrates a closure. The closure is preferably a membrane 35, which is formed from the same material as the sealing element 19. The sealing element 19 and the diaphragm 35 are preferably integrally injection-molded and are injection-molded onto the shaft 13. Preferably, the second end 17 of the shaft 11 is formed in a step-wise manner. The steps can be encapsulated with the density element 19, as a result of which a particularly strong connection between the shaft 11 and the density element 19 can be produced (FIG. 4). The diaphragm 35 is designed in such a way that it performs the function of a valve, which allows adhesive to penetrate into the shaft, but prevents an outflow into the opposite flow direction. Figures 3 and 4 show, The diaphragm 35 has a plurality of predetermined breaking points 37. At least 4 cruciformly arranged break-off points 37 are suitable. The pressure of the adhesive breaks the desired breaking points 37, resulting in a plurality of circular-segment-shaped flaps 39. The flaps 39 swivel inwards and allow the adhesive to pass through. The number of flaps 39 is determined by the number of predetermined break points 37. FIG. 4 shows that the closed membrane 35 is oriented inwards in the direction of the shaft 13. This facilitates the pressure of the membrane by the adhesive pressure. The orientation of the diaphragm 35 inwards also ensures that it can not be pushed outwards by the adhesive which is present in the shaft 13 after the injection. Preferably, the inner surface of the flaps 39 is designed such that,

[0032] In the first embodiment, the adhesive first fills the interior of the shaft. In order that not too much adhesive is required to fill the interior of the shaft 13, longitudinal struts 40 are formed on the inside (FIGS. 2 and 5). The longitudinal struts 40 also cause a screw 42 screwed into the plug 11 to hold very well in the plug 11 since the screw 42 can cut into the longitudinal struts 40. In order to enable the cavity of the shaft to be filled with adhesive up to the first end 15 or the tip 18, vent openings 41 are provided at the first end 15, through which the air displaced by the adhesive can escape into the insulation material 25.

In the second embodiment according to FIG. 6, closed hollow bodies 43 are provided along the shaft 13 and are surrounded by the dowel material. The hollow bodies 43 reduce the internal volume of the shank so that only one screw receptacle 45 is provided. The adhesive can therefore not penetrate into the shaft 13, or only to a limited extent, since the path through the outlet openings 47 has the lower flow resistance than the screw receptacle 45. Hollow bodies 43 which have been bulged in the direction of the longitudinal axis and extend along the longitudinal axis have proved to be advantageous. As a result, the screw 42 is firmly held in the dowel 11 without the dowel material being destroyed.

When the shaft 13 is filled with adhesive in the first embodiment of the plug 11, the adhesive flows through the outlet openings 47. In the second embodiment, the adhesive flows through the outlet openings 47 immediately after passing through the membrane 35 since it does not enter the shaft 13. The outlet openings 47 are arranged as close as possible to the inner side of the plaster layer 23. Preferably, the outlet openings 47 have an internal diameter of 2 to 3 mm. Due to the injection pressure of the adhesive, the adhesive can penetrate into the insulating material 25, and thus reinforced around the outlet openings 47. As a result, an adhesive collar 45 is formed around the outlet openings 47 (shown by surrounded polygons in FIG. If the adhesive collar is cured,

The adhesive penetrates still further into the insulating material 25 along the shank 13. However, it can no longer penetrate as deeply into the insulating material 25 as around the outlet openings 47, since the pressure along the shank 13 decreases. In order to force the adhesive into the insulating material 25, transverse struts 51 extend in the circumferential direction on the outside of the shank 13. The deep penetration of the adhesive, in particular in the region of the plaster layer, is essential since a very high pull-out safety of the plug 11 is achieved. The adhesive collar 45 is formed with a decreasing pressure in the insulating material 25 essentially in the shape of a cone. As a result, the plug 11 is firmly anchored in the ETICS and stabilized. An amount of approx. 15 to 50 ml of 1-component or 2-component adhesive has been used to bond the anchor 11 in an ETICS. The amount of the adhesive depends on the size of the plug and the desired size of the adhesive collar. An escape of the dowel 11 is reliably avoided by means of the dowel 11 according to the invention and the injected adhesive.

Claims

11 Dowel 13 Shaft 15 First end of the shank 17 Second end of the shank 18 Top as a separate part 19 Density element 21a, 21b Drill hole in the ETICS 23 Cleaning layer 25 Insulation material 27 Entry opening 29 Insertion aid 31 Impression surface 33 Protrusion 35 Membrane 37 Breakage point 39 flaps 40 longitudinal struts 41 vents 42 screw 43 closed hollow body 45 screw receptacle 47 outlet openings 49 adhesive collar 51 pull-out safety devices, transverse struts

(EN) The invention relates to a plug (11) for fastening in a heat insulation composite system (WDVS) comprising - a hollow shaft (13) having a first and second end (15, 17), and a density element (19) arranged at the second end (17) (23) of the ETICS, characterized in that at least one outlet opening (47) is provided at the second end (17) of the shank (13). (DE). WIPO Home services World Intellectual Property Organization

2. An anchor according to claim 1, characterized in that the sealing element (19) is designed to seal the borehole (21 a) against a liquid adhesive, which has an overpressure caused by the adhesive injection.

3. Dowel according to claim 1, characterized in that the sealing element (19) and the shaft (13) consist of different plastics, the sealing element (19) preferably being made of a thermoplastic elastomer.

4. An anchor according to claim 1, wherein an inlet opening (27) penetrating the sealing element (19) in the longitudinal direction is provided on the sealing element, in which a closure (35) is formed.

5. The dowel according to claim 4, characterized in that the closure (35) has the function of a valve, in that it can be opened by an overpressure at the inlet opening (27) and can be closed by an overpressure in the shaft (13).

6. The plug according to claim 4, wherein the closure is a diaphragm with at least one predetermined breaking part. A dowel according to one of the preceding claims, characterized in that the density element (19) and the second end (17) are physically connected.

7. Dowel according to one of the preceding claims, characterized in that the sealing element (19) has a sealing region in the form of a truncated cone.

8. The plug according to claim 1, wherein the at least one outlet opening is provided at a short distance from the sealing element at the second end.

9. Dowel according to claim 1, characterized in that a plurality of outlet openings (47) are arranged at the circumference of the second end (17).

10. The plug according to claim 1, wherein a plurality of sealed hollow bodies is provided in the shank.

11. The plug according to claim 1, wherein at least one vent (41) is provided at the first end (15) for the escape of the air present in the shaft (13).

12. Dowel according to one of the preceding claims, characterized in that the first end (15) is shaped as a tip.

13. The plug according to claim 12, characterized in that the tip is a separate part (18) which can be connected to the shank (13).

14. The plug according to claim 1, wherein the outlet opening has internal dimensions between 1 mm and 5 mm, and preferably between 2 and 3 mm.

15. The plug according to claim 1, wherein a plurality of longitudinal struts is provided on the inside of the shank.

16. The plug according to claim 1, wherein a plurality of pull-out safety devices (51) are formed on the outside of the shank (13).

17. The set of a plug (11) according to one of the preceding claims and an insertion aid (29) with an indentation surface (31), characterized in that the insertion aid (29) has a continuation (33) bridging the density element (19) And a direct connection of the indentation surface (31) to the shaft (13).

18. A method for fastening an anchor in an ETICS, wherein a drill hole is drilled into the plaster layer of the ETICS, a plug according to the preceding claims is inserted into the ETICS through the borehole, 21a), so that the sealing element (19) flushes with the cleaning layer (23), - a liquid adhesive is injected into the shaft (13) with such a pressure as to penetrate through the outlet openings (47) into the thermal insulation (25) (19) and the cleaning layer (23) is prevented and - a certain volume of liquid adhesive is injected. (DE). WIPO Home services World Intellectual Property Organization