Sealing web, sealing system, structure, method for detecting leaks, method for installing a sealing system

Abstract

The invention relates to a sealing web, preferably a flexible sealing web, having a layer system consisting of multiple layers, in particular in the form of a sealing layer web, for sealing structures (10), preferably concrete structures, having a container region preferably for receiving and / or storing biomass. The invention is characterized in that the layer system has a first container-side sealing layer (20) for sealing against the passage of fluid from the container region, a second structure-side sealing layer (22) for sealing against the passage of fluid into the structure (10), and a drainage layer (21), which is arranged between the first sealing layer (20) and the second sealing layer (22), for draining fluid that has entered the drainage layer (21), in particular in the event of damage to the first sealing layer (20). The invention also relates to a sealing system, to a structure and to associated methods.

Description

[0001] Sealing membrane, sealing system, structure, leak detection method, method for installing a sealing system

[0002] Description

[0003] The invention relates to a sealing membrane, in particular a sealing layer membrane and / or a composite product, according to the preamble of claim 1. Furthermore, the invention relates to a sealing system according to the preamble of claim 9. The invention also relates to a structure, in particular a concrete structure, according to the preamble of claim 10. Furthermore, the invention relates to a method for leak detection according to the preamble of claim 13. Finally, the invention relates to a method for installing a sealing system according to the preamble of claim 14.

[0004] For various applications, structures, especially concrete structures, must be sealed and, in particular, protected against concrete corrosion. This is especially important in the area of ​​increasing biomass use. Here, environmental protection and protection against the effects of aggressive media play a crucial role. Another factor is the increasing proportion of high-value basement levels, especially in commercial buildings such as data centers. In this context, the ability to monitor the integrity of the waterproofing is becoming increasingly important.

[0005] Biomass, particularly liquid manure, slurry, and silage (JGS), typically releases aggressive liquids, especially silage leachate. Therefore, protecting the surrounding area from these aggressive substances is crucial. In addition to environmental protection considerations, it is essential to ensure that the structure itself, especially any biomass storage container, is not affected by these aggressive liquids. Otherwise, significant damage to concrete and similar materials can occur.

[0006] Several measures are known from the prior art, such as applying plastic films or similar materials to the inner walls of a biomass storage container, or using other coating systems. These are intended to prevent the aggressive liquids contained within from penetrating towards the walls. However, damage to such film coatings is a regular occurrence. This damage can then allow the aggressive medium to escape and potentially harm the concrete structure.

[0007] Even trials with double-layered membranes offer only temporary advantages at best, as both layers can easily be damaged. This can then lead to the leakage of aggressive liquids, causing damage to the building structure and environmental harm. Above all, conventional double-layer sealing systems pose a significant risk of backflow, meaning the unintentional penetration of liquids into the spaces between the layers.

[0008] It is therefore an object of the invention to eliminate the disadvantages of the prior art. In particular, it aims to achieve improved sealing and / or protection of structures, such as storage facilities or containers for biomass, especially against aggressive media. Ideally, leakage monitoring should also be provided.

[0009] The described problem is solved by the subject matter and methods of the independent claims, and furthermore by the dependent claims.

[0010] A sealing membrane, preferably a flexible sealing membrane and / or a composite product, with the features of claim 1 solves this problem. A sealing membrane, preferably a flexible sealing membrane, comprises a layered system consisting of several layers, in particular as a sealing layer membrane. It serves for sealing structures, preferably concrete structures, especially on concrete structures.

[0011] In particular, a container area, preferably for receiving and / or storing biomass, can be provided. The layered system is characterized by a first sealing layer on the container side to prevent liquid from seeping out of the container area. Furthermore, a second sealing layer on the structure side is provided to prevent the ingress, especially from the rear, of concrete slurry, i.e., liquid fresh concrete or escaping water, into the drainage space and / or, if necessary, to prevent liquid from seeping into the structure. Finally, a drainage layer is provided between the first and second sealing layers to drain away any liquid that has entered the drainage layer, particularly in the event of a breach in the first sealing layer. This ensures reliable protection against liquid ingress and / or the drainage of liquid in the drainage layer.

[0012] Preferably, the first sealing layer and / or the second sealing layer is made of a liquid-tight, preferably fluid-tight, material. More preferably, this is a film material. The first sealing layer is preferably made of a more stable and / or thicker material than the second sealing layer. The material can be applied, for example, by extrusion coating. The layers thus fulfill their sealing purpose.

[0013] Preferably, the drainage layer is formed from a permeable and / or hydrophilic material, preferably at least partially, and more preferably completely. In particular, the drainage layer is formed from a fibrous material, preferably a nonwoven fabric, and more preferably a hydrophilic nonwoven fabric. This ensures good liquid transport within the drainage layer.

[0014] Preferably, an embedding layer is provided for connection to a structure. This can preferably serve for a permanent connection, in particular to a concrete structure. The embedding layer is further preferably connected to the second sealing layer, in particular permanently and / or over a wide area. The embedding layer can preferably be formed from a material that can be embedded in concrete, in particular in fresh concrete, preferably from a fibrous material, in particular from a nonwoven fabric. When the embedding layer and the fresh concrete come into contact, the fresh concrete can penetrate the embedding layer and set. This allows a permanent bond to be achieved. Preferably, an adhesive coating, in particular a full-surface adhesive coating, can also be provided for creating the connection. The connection between the embedding layer and the structure or concrete is also preferably watertight.This means, in particular, that the concrete and the sealing system, especially its second sealing layer, are in direct contact with each other. This prevents any fluid or liquid from penetrating the space between the structure and the sealing system. This reliably prevents the structure, especially the concrete, from being attacked by aggressive media. Some or all of the adjacent layers are preferably bonded together, preferably permanently. This bonding is particularly permanent and / or covers the entire surface. This can preferably be achieved by bonding and / or welding and / or by means of an extrusion coating. This results in a stable layer system. The drainage layers of the individual membranes are preferably connected to each other, particularly by fluid. This allows liquid to pass through the drainage layers of several membranes.In the area of ​​the joint edges of the individual layers, the drainage layers preferably abut each other with their long sides.

[0015] At least one, preferably several, and in particular all layers are partially or completely resistant to external influences, preferably to aggressive media and / or chemical agents. In particular, the layers are resistant to liquid manure, slurry, and silage, especially silage leachate. The layers are preferably composed of liquid manure-resistant materials, raw materials, or components. This ensures safe application in conjunction with aggressive media, especially biomass.

[0016] At least one of the layers, preferably several layers, and more preferably all layers, are preferably made of polyolefins and / or polyolefin-based materials. They are particularly preferably made of polypropylene (PP) and / or polyethylene (PE). This can apply in particular to the nonwoven and / or non-woven fabric and / or film and / or sealing layer layers in general. Such materials are particularly well suited for these purposes.

[0017] A leak detection system is preferably assigned to the drainage layer, preferably arranged on it and / or integrated into it. In particular, at least one sensor, preferably a leakage sensor, is assigned to detect fluid in the drainage layer. Preferably, the at least one sensor is provided in or at the edge of the drainage layer. This allows for automated detection and / or reporting of leaks. The sensor can be, in particular, an electrical sensor capable of detecting fluids or liquids. Preferably, leak detection can be made visually identifiable by means of a signal masking. In particular, the signal masking is applied to the outside of the sealing membrane and / or is a different color than the sealing membrane. In this way, any leakage can also be visually detected during a manual inspection.

[0018] The problem is further solved by a sealing system for sealing a structure, in particular a concrete structure, especially with the features of claim 9, preferably with at least one sealing membrane or membrane according to one of the preceding claims, preferably several sealing membranes. Larger structures can be sealed by combining several sealing membranes.

[0019] Several of the sealing membranes are connected to each other, preferably in a liquid-tight manner, wherein the sealing membranes are preferably connected to each other at butt joints, preferably in the area of ​​their side edges, wherein preferably at least one sealing strip is provided for connecting two sealing membranes, in particular for sealing the connection area or butt joint area of ​​the sealing membranes, and / or wherein the at least one sealing strip is preferably applied to the adjacent sealing membranes by means of gluing or welding, preferably permanently, in particular as a weld strip. This ensures a seal against liquid penetration.

[0020] A leak detection system is preferably provided, particularly in the event of a breach in the first sealing layer. The drainage layer preferably drains any liquid that has entered it, particularly into at least one control chamber, which is preferably designed as a circumferential annular space. Preferably, at least one sensor, in particular a leakage probe, is provided for detecting liquid that has penetrated the drainage layer. The at least one sensor is preferably arranged in and / or on the drainage layer and / or in or on the control chamber. This preferably enables the detection of unwanted liquid ingress, i.e., leaks.

[0021] A structure, in particular a concrete structure, according to claim 12 solves the problem described above. It is specifically equipped with at least one sealing system as described above and at least one wall area to be sealed against liquid penetration by the sealing system. The wall area preferably serves as part of a container for receiving and / or storing biomass. It is preferably connected to the wall area by at least one sealing membrane as described above. Preferably, it serves to protect the entire surface of the wall area by means of the at least one sealing membrane. This ensures a reliable seal.

[0022] A method for leak detection according to claim 13 in a sealing membrane as described above and / or a sealing system as described above and / or a structure as described above also solves the problem. It is characterized in that a liquid ingress into the drainage layer and / or a control chamber connected to the at least one drainage layer is detected, preferably by means of at least one sensor, in particular a leakage sensor. The at least one sensor is preferably monitored by means of a control device. An alarm is triggered upon detection of liquid in the drainage layer and / or in the control chamber, in particular by sending at least one message, preferably an electronic message. This provides a method for reliable leak detection.

[0023] A method according to claim 14 for installing a sealing system, particularly as described above, for a structure, especially a concrete structure, solves the above problem. It is characterized in particular by the fact that at least one sealing membrane, preferably as described above, is applied to and / or into and / or around a formwork or mold in order to pour fresh concrete, and / or that at least one sealing membrane, preferably as described above, is connected to precast concrete elements. This provides a suitable installation method. Existing buildings can also be retrofitted with corresponding sealing membranes and / or sealing systems.

[0024] Preferably, a leak detection system is installed by arranging at least one sensor, preferably at least one leakage sensor, in the drainage layer of the sealing membrane and / or in a control chamber connected to the drainage layer by a fluid-conducting element. This enables automated leak detection.

[0025] A preferred embodiment of the invention is described in more detail below with reference to the figures in the drawing. These show:

[0026] Fig. 1 shows a wall section of a container for biomass with a sealing membrane or a sealing system according to the invention, and Fig. 2 shows a detail section of a sealing membrane according to the invention.

[0027] Figure 1 shows a section of a structure 10, which can, for example, be used to store biomass. It is, in particular, a trough-shaped container, such as a silo or similar structure.

[0028] Only a wall section 11 and a bottom section 12 of the container are shown here. The wall element 11 and the bottom element 12 could each be separate or individual concrete components. For example, precast concrete elements or cast-in-place concrete could be used.

[0029] The wall section 11 and the bottom section 12 form the outer structure of the container as a structure 10. A seal is provided on the inside of the container to protect against materials stored within, such as biomass. In this example, three sealing membranes 13, 14, 15, shown in Fig. 1, serve this purpose. The sealing membranes 13, 14, 15 are connected to one another.

[0030] The sealing membranes 13, 14, and 15 are applied across the entire surface of wall section 11 and floor section 12, respectively. Specifically, sealing membrane 15 is located horizontally on floor section 12. Sealing membranes 13 and 14 are arranged vertically on wall section 11.

[0031] The sealing membranes 13, 14 and 15 abut each other at their side edges or butt edges 16 and 17, respectively. The gap at these butt edges 16 and 17 is initially open to allow liquid to pass through.

[0032] To prevent liquid from penetrating the area of ​​these butt joints 16 and 17, they were covered with sealing strips 18 and 19, respectively, on the inside of the container. The sealing strips 18 and 19 cover the butt joints 16 and 17, respectively. To achieve a reliable seal, the sealing strips 18 and 19 can be bonded or welded to the sealing membrane 13, 14, 15. Other methods for creating a liquid-tight or even fluid-tight seal can also be used.

[0033] Since the two sealing membranes 13 and 14 run in a common plane, the butt joint 60 runs horizontally, i.e., perpendicular to the surfaces of the two sealing membranes 13 and 14. In the area of ​​the butt joint 17, however, there is a right angle between the sealing membranes 14 and 15. Accordingly, the sealing strip 90 must also be arranged at a right angle to bridge the gap across the two sealing membranes 14 and 15.

[0034] Figure 2 shows an enlarged detail A in the form of a circular cutout. Several corresponding circular cutouts are indicated in Figure 1. Detail A in Figure 2 thus shows the detail of the identical structure of the three sealing membranes 13, 14, and 15.

[0035] The sealing membrane 13, 14, 15 shown in detail A is composed here as a layer system of four layers.

[0036] A first sealing layer 20 is provided on the inside of the container. In this embodiment, this is the layer with the greatest thickness in cross-section, i.e., the thickest layer. This sealing layer 20 serves as the primary seal against the liquids inside the container.

[0037] A drainage layer 21 is provided as a second layer. This drainage layer 21 is located between the first sealing layer 20 and a further second sealing layer 22. The drainage layer 21 thus forms an intermediate layer.

[0038] Due to a breach or damage to the first sealing layer 20, liquid from the container can penetrate through the first sealing layer 20. In this case, the liquid then flows into the drainage layer 21. However, due to the second sealing layer 22 located behind it, the liquid cannot then penetrate further into the structure 10, here indicated by wall section 11 or wall section 12. The second sealing layer 22 therefore serves to prevent this liquid penetration.

[0039] In this embodiment, an embedding layer 23 is also provided. This embedding layer 23 is arranged adjacent to the second sealing layer 22 on the structure side. The embedding layer 23 is actually a fiber layer, for example, made of nonwoven fabric. Such a layer 23 can be embedded directly in fresh concrete. In this way, a particularly strong bond between the sealing membrane 13, 14, 15 and the structure 10 can be created. Consequently, if liquid penetrates the first sealing layer 20, it can enter the drainage layer 21.

[0040] The fluid can then be conveyed through drainage layer 21. Typically, this occurs downwards, especially in areas that are essentially vertical. However, even in sloping or slightly inclined areas, the fluid can collect at the lowest point.

[0041] In principle, a collection chamber or control chamber 24 can be provided, for example, in the area of ​​the impact edges 17 or in other areas. Such a control chamber 24 can be designed to collect liquid and, if necessary, detect it.

[0042] For this purpose, at least one sensor (not shown here) can be installed in this area. Leak detection can then be carried out using one or more such sensors. As soon as liquid enters control room 24, for example, an alarm can be triggered to secure structure 10.

[0043] As an alternative to an arrangement in control room 24, corresponding sensors can also be provided directly in the drainage layer 21. For example, sensors can be provided at the joint edges 16, 17 or embedded directly in the drainage layer 21. Such sensors can then be used to detect the presence of liquid in the drainage layer 21. These embodiments and methods can also be combined with one another to achieve multiple safeguards for triggering an alarm.

[0044] In the corresponding procedure for installing a structure 10 with a sealing system, suitable sealing membranes 13, 14, 15 can be applied, for example, to precast concrete elements. This can be done by gluing or other, particularly permanent, bonding methods. The corresponding butt joints or connection points between the individual sealing membranes 12, 13, 14 can be bridged with suitable sealing strips 18, 19 or other suitable welded membranes and the like. In this way, a reliable seal can be achieved.

[0045] To enable such application to precast concrete elements or other existing structures, three-layer sealing membranes 13, 14, 15 may suffice. In this case, the sealing membranes 13, 14, 15 can therefore be formed from only three layers, i.e., at least the first sealing layer 20, the drainage layer 21, and the second sealing layer 22. The inventive purpose of draining the liquid in the area of ​​the drainage layer 21 and detecting it can thus be achieved.

[0046] However, with a three-layer construction, the problem can arise that liquid enters the area between the sealing membrane and the building structure.

[0047] This can be prevented by integrating the system into the structure or by permanently bonding it to its surface. For example, the sealing system can be glued to the surface of the structure.

[0048] Instead of applying it to finished building components or concrete elements, it can also be incorporated into fresh concrete.

[0049] For this purpose, the sealing membranes 13, 14, 15 can in particular be equipped with an embedding layer 23. The embedding layer 23 is preferably provided on the side of the second sealing layer 22.

[0050] The sealing membranes 13, 14, and 15 can be laid, applied, or stretched onto suitable formwork. The first sealing layer 20 faces the formwork. The bonding layer 23 is aligned accordingly in the direction of the fresh concrete to be poured. The fresh concrete can then partially penetrate this bonding layer 23, as it is a fibrous material. As the concrete sets, a strong and permanent bond is formed with the respective sealing membranes 13, 14, and 15. The formwork can then be removed.

[0051] By embedding the sealing system in the concrete in this way, it is effectively prevented that liquid penetrates the area between the sealing system and the structure. The embedding in the fresh concrete thus makes the sealing system leak-proof. This effectively prevents at least widespread damage to the structure caused by aggressive liquids, as the liquids cannot come into contact with the structure, particularly the concrete. A corresponding leak detection method can also be implemented, either additionally or alternatively, based on the invention described herein.

[0052] For this purpose, it is necessary to connect at least one sensor to the drainage layer 21 or to a corresponding control chamber 24. By guiding the liquid through the drainage layer 21 to such a sensor, the sensor can detect the presence of liquid in the area of ​​the drainage layer 21. A corresponding alarm can then be triggered, for example by a suitable electronic control unit.

[0053] The drainage layer 21 can be designed as a hydrophilic layer. For this purpose, a hydrophilic material is used, for example, a hydrophilic nonwoven fabric. This allows for particularly good fluid conductivity within the layer 21. Fluid penetrating the drainage layer 21 is then preferably conveyed throughout the entire layer 21. In this way, the presence of fluid in the area of ​​the drainage layer 21 can be detected quickly.

[0054] According to the invention, the sealing membranes 13, 14, 15 are preferably manufactured as flexible material sheets. This allows them to be produced, for example, as roll goods or similar. In this way, simple manufacturing, transport, and installation are facilitated. The sealing membrane can therefore be used very flexibly.

[0055] The individual layers of the sealing membranes 13, 14, 15 are firmly and / or permanently bonded to one another. This applies to adjacent layers. For example, they can be glued or welded. They can also have been manufactured using a material-bonded process. Such a bond between the individual layers ensures a reliable seal and long-term durability.

[0056] Suitable materials for the individual layers are primarily polyolefin-based. In particular, these can be made of polypropylene (PP) and / or polyethylene (PE).

[0057] ***** Reference symbol list

[0058] 10 Building

[0059] 11 Wall section 12 Floor section

[0060] 13 Sealing membrane

[0061] 14 Sealing membrane

[0062] 15 Sealing membrane

[0063] 16 butt edge 17 butt edge

[0064] 18 sealing strips

[0065] 19 sealing strips

[0066] 20 first sealing layer

[0067] 21 Drainage layer 22 Second sealing layer

[0068] 23 Integration layer

[0069] 24 Control Room

Claims

Patent claims 1. Sealing membrane, preferably a flexible sealing membrane and / or composite product, with a layer system of several layers, in particular as a sealing layer membrane, for sealing structures (10), preferably concrete structures, with a tank area preferably for receiving and / or storing biomass, characterized in that the layer system comprises a first tank-side sealing layer (20) for sealing against liquid penetration from the tank area, a second structure-side sealing layer (22) for sealing against liquid penetration into the structure (10), and a drainage layer (21) arranged between the first sealing layer (20) and the second sealing layer (22) for draining liquid that has entered the drainage layer (21), particularly in the event of a breach of the first sealing layer (20).

2. Sealing membrane according to claim 1, characterized in that the first sealing layer (20) and / or the second sealing layer (22) is formed from a liquid-tight, preferably fluid-tight material, preferably a film material, wherein the first sealing layer (20) is preferably formed from a more stable and / or thicker material than the second sealing layer (22).

3. Sealing membrane according to claim 1 or 2, characterized in that the drainage layer (21) is formed from a drainage-capable and / or hydrophilic material, preferably at least partially, further preferably completely, wherein the drainage layer (21) is formed in particular from a fibrous material, preferably a nonwoven fabric, further preferably a hydrophilic nonwoven fabric.

4. Sealing membrane according to one of the preceding claims, characterized in that an embedding layer (23) is provided for connection with a structure (10), preferably for a permanent connection, in particular a concrete structure, wherein the embedding layer (23) is preferably connected to the second sealing layer (22), in particular permanently and / or over a surface, wherein the embedding layer (23) is preferably formed from a material that can be embedded in concrete, in particular in fresh concrete, preferably from a fibrous material, in particular from a nonwoven fabric, and / or that the connection is preferably between the embedding layer (23) and the structure (10) or concrete structure is protected against backflow.

5. Sealing membrane according to one of the preceding claims, characterized in that some or all of the adjacent layers are particularly firmly connected to each other, in particular permanently and / or over a surface, preferably by bonding and / or welding and / or by means of extrusion coating.

6. Sealing membrane according to one of the preceding claims, characterized in that at least one, preferably several, in particular all layers are partially or completely resistant to influences, preferably chemical influences, in particular resistant to liquid manure, slurry and silage, in particular silage leachate, wherein the layers are preferably formed from liquid manure-resistant raw materials or components.

7. Sealing membrane according to one of the preceding claims, characterized in that at least one of the layers, preferably several of the layers, further preferably all layers, in particular at least the layers made of nonwoven fabric and / or nonwoven material and / or film, are made of polyolefins and / or materials based on polyolefins, in particular of polypropylene (PP) and / or polyethylene (PE).

8. Sealing membrane according to one of the preceding claims, characterized in that a leak detection system is assigned to the drainage layer (21), preferably arranged on it and / or integrated into it, wherein in particular at least one sensor for detecting liquid is assigned to the drainage layer (21), preferably is provided in the edge region of the drainage layer (21), and / or that a leak detection system is visually recognizable by means of a signal lamination, wherein the signal lamination is preferably applied to the outside of the sealing membrane and / or is designed in a different color than the sealing membrane.

9. Sealing system for sealing a structure (10), in particular a concrete structure, comprising at least one sealing membrane according to one of the preceding claims, preferably several sealing membranes.

10. Sealing system according to claim 10, characterized in that several of the sealing membranes (13, 14, 15) are connected to one another, preferably in a liquid-tight manner, wherein the sealing membranes (13, 14, 15) are preferably connected to one another at butt joints, preferably in the area of ​​their side edges, wherein preferably at least one sealing strip (18, 19) is provided for connecting two sealing membranes (13, 14, 15), in particular for sealing the connection area or butt joint area (16, 17) of the sealing membranes (13, 14, 15), and / or wherein the at least one sealing strip (18, 19) is preferably applied to the adjacent sealing membranes (13, 14, 15) by means of gluing or welding, preferably permanently, in particular as a weld strip.

11. Sealing system according to claim 10, characterized in that a system for detecting leaks is provided, in particular in the event of a breach of the first sealing layer (20), wherein the drainage layer (21) drains any liquid that has entered the drainage layer (21), in particular into at least one control chamber (24), which is in particular designed as a circumferential annular chamber, and / or wherein in particular at least one sensor, in particular a leakage probe, is provided for detecting liquid that has entered the drainage layer (21), wherein the at least one sensor is in particular arranged in and / or on the drainage layer (21) and / or in or on the control chamber (24).

12. Structure, in particular a concrete structure, with at least one sealing system according to one of claims 9 to 11 and at least one wall area to be sealed against liquid action by the sealing system, wherein the wall area preferably serves as part of a container for receiving and / or storing biomass, and / or wherein at least one sealing membrane (13, 14, 15) according to one of claims 1 to 8 is preferably connected to the wall area, preferably for the area-wide protection of the wall area by means of the at least one sealing membrane (13, 14, 15).

13. Method for leak detection in a sealing membrane according to one of claims 1 to 8 and / or a sealing system according to one of claims 9 to 12 and / or a structure according to claim 12, characterized in that a liquid ingress into the drainage layer (21) and / or a control chamber (24) connected with the at least one drainage layer (21) is detected, preferably by means of at least one sensor, in particular a leakage sensor, wherein preferably the at least one sensor is monitored by means of a control device. and / or wherein an alarm is triggered upon detection of liquid in the drainage layer (21) and / or in the control room (24), in particular by sending at least one message.

14. Method for installing a sealing system, in particular according to one of claims 9 to 11, for a structure, in particular a concrete structure, characterized in that at least one sealing membrane, preferably according to one of claims 12 to 8, is applied on and / or in and / or around a formwork or formwork to pour fresh concrete, and / or that at least one sealing membrane (13, 14, 15), preferably according to one of claims 12 to 8, is connected to precast concrete elements.

15. Method for installing a sealing system according to claim 14, characterized in that a leak detection system is installed by arranging, in particular, at least one sensor, preferably a leakage sensor, in the area of ​​the drainage layer (21) and / or a control chamber (24) connected to the drainage layer (21) in a fluid-conducting manner, and / or that a leak detection system is made visually recognizable by means of a signal lamination, wherein the signal lamination is preferably applied to the outside of the sealing membrane and / or is designed in a different color than the sealing membrane. *****

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