NL2035232B1

NL2035232B1 - Sealing structure and use of said sealing structure for sealing a catch basin of a SFH facility

Info

Publication number: NL2035232B1
Application number: NL2035232A
Authority: NL
Inventors: Baak Leo; Huckauf Robert
Original assignee: Safewaves Gmbh
Priority date: 2022-06-30
Filing date: 2023-06-30
Publication date: 2025-11-25
Also published as: DE202022103643U1; BE1030611B1; BE1030611A1; NL2035232A

Abstract

A b s t r a c t The invention relates to a sealing structure (100) comprising a foil—like sealing system (30) in compliance with water protection laws and a flexible concrete composite material (20), which concrete composite material (20) comprises a liquid—impermeable, hydrocarbon—resistant carrier layer (20—1), and which concrete composite material (20) cures in combination with water and forms a liquid—impermeable concrete layer, wherein the foil—like sealing system (30) is connected to the cured concrete layer in a liquid—tight and hydrocarbon—resistant manner by means of adhesive bonding.

Description

Sealing structure and use of said sealing structure for sealing a catch basin of a SFH facility

The invention relates to a sealing structure as set forth in claim 1, as well as to the use of said sealing structure for sealing a catch basin in a facility for storing, filling and handling substances hazardous to water as set forth in claim 6.

Many substances in our environment can adversely affect the quality of water. Some substances or mixtures will have this effect even at extremely low concentrations. Negative prop- erties such as severe oxygen depletion, toxicity, lack of degradability, carcinogenicity, etc. are harmful both to the ecosystem and to humans. A high number of substances used in the industrial sector are hazardous to water. In section 62 (3), item 3 of the German Water Resources Act (WHG), the term "substances hazardous to water" is defined as follows: “Any solid, liquid or gaseous substances that are capable of causing permanent or not insignificant adverse changes in the water guality.”

Facilities handling substances hazardous to water are di- vided into so-called LAU plants (i.e. facilities for stor- age, filling and handling) and HBV plants (i.e. facilities for manufacturing, treatment and use).

Under the German Water Resources Act (WHG), LAU plants and

HBV plants handling substances that are hazardous to water in the industrial sector and in public facilities must be designed in such a way that their operation does not pose a risk to water bodies.

As a consequence of numerous accidents involving substances hazardous to water, which resulted in the contamination of surface waters and groundwater, regulations for plants han- dling substances hazardous to water were enshrined both in the Water Resources Act (WHG) and in acts passed by the

German federal states. Furthermore, using the federal Water

Resources Act (WHG) as a basis, the Ordinance on Installa- tions for the Handling of Substances Hazardous to Water (AwSV) was issued in its last revised version of 2017.

For the first time, uniform nationwide requirements for plants handling substances hazardous to water were estab- lished with this AwSV ordinance, which replaced the various previously applicable plant ordinances (VAwS) of the indi- vidual federal states.

It is the object of the present invention to provide a sealing structure that can be used as a cost-effective,

AwSV-compliant means for discharging and collecting water- polluting substances.

This object is accomplished by claim 1.

Dependent claims 2 to 5 relate to advantageous further em- bodiments of the sealing structure according to the inven- tion.

The sealing structure according to the invention is charac- terized in that it comprises a foil-type sealing system that is permissible under the Water Act and a flexible concrete composite material. The concrete composite material com- prises a ligquid-impermeable, hydrocarbon-resistant carrier layer and cures in combination with water to form a liquid- impermeable concrete layer, and the foil-type sealing system is connected to the cured concrete layer in a liquid-imper- meable and hydrocarbon-resistant manner by means of adhesive bonding.

It is merely to be noted additionally that the actual dry concrete mixture of the flexible concrete composite is ar- ranged between the liquid-impermeable, hydrocarbon-re- sistant carrier layer and a water-permeable, UV-resistant top layer, allowing activation of the dry concrete mixture or of its setting process to be initiated by simply applying or spraying water onto the top layer.

The combination of the foil-type sealing system with the flexible concrete composite material according to the in- vention proves to be particularly advantageous, since, on the one hand, the flexible concrete composite material en- sures fast, large-area and thus cost-effective application and, on the other hand, the foil-type sealing system can also be used to seal special connection areas that cannot reliably be sealed in an AwSV-compliant manner using the concrete composite material, for example areas between the hardened concrete layer and adjoining attachments, such as a connection to a tank wall, a connection to a concrete or metal support, a connection to a drainage channel and/or to a pipeline, as well as joint areas between two already hard- ened concrete layers.

Preferably, the flexible concrete composite is in roll form, in other words, it is concrete offered in rolls. This means that the concrete composite can be laid quickly and easily in the form of sheets.

Preferably, the carrier layer of the concrete composite is designed to be thermally weldable. This ensures that - es- pecially when the concrete composite is laid in sheets - two sheets arranged next to each other can be joined together reliably in a liquid-tight and hydrocarbon-resistant manner by means of an appropriate thermal welding process.

Preferably, the foil-type sealing system is the MasterPro- tect 7801 AS type sealing system; with regard to the approval under the Water Act, reference is made to the general build- ing inspectorate approval, approval no. Z-59.31-428, dated

November 22, 2021.

The flexible concrete composite material is preferably the

Concrete Canvas Hydro type or Concrete Canvas Hydro CCX type product. Regarding its suitability as a sealing system, ref- erence is made to an existing certificate of conformance, i.e. the certificate of conformance to BS EN 16983:2018, that certifies its use in the construction of storage tanks, catch basins (above and below ground) and other applications for chemicals, contaminated water and produced liquids. It is merely to be noted in addition that a corresponding opin- ion from an AwSV expert regarding its use under water law has already been commissioned and is currently being elab- orated.

It is a further object of the present invention to provide a cost-effective, AwSV-compliant way for repairing or re- sealing a catch basin on existing base surfaces, such as soil, concrete substrates, bitumen, asphalt, plating, gravel, etc., in a facility for storing, filling and han- dling water-polluting substances, i.e. an LAU plant.

This object is accomplished in accordance with claim 6 by repairing or resealing the catch basin of the LAU plant using the sealing structure described above.

Dependent claims 7 to 15 relate to advantageous further embodiments of the use according to the invention.

The use of the sealing structure according to the invention provides for lining the floor and walls of the catch basin of the LAU plant with the flexible concrete composite mate- rial in such a way that will leave an exposed connection area not covered by the concrete composite material only in the area around an attachment element, such as the area around a support, the area arcund a tank connection, the area around a pipe and/or the connection area to a drainage channel, etc., and provides for the foil-type sealing system to be arranged in such a way that these exposed connection 5 areas are covered by the foil-type sealing system, and - after curing and formation of the concrete layer - for the foil-type sealing system covering the exposed connection areas to be connected to the cured concrete layer and the attachment in a liquid-tight and hydrocarbon-resistant man- ner by means of adhesive bonding.

It is merely to be noted additionally that, following curing and formation of the concrete composite for adhesive bond- ing, the water-permeable, UV-resistant surface layer will be removed in areas. In other words, the foil-like sealing system will be glued directly onto the then cured concrete layer,

In addition to the advantage that repairing or resealing can be performed in a fast and cost-effective manner, using the sealing structure has the effect that it also ensures a high level of mechanical protection once the concrete has cured completely.

As explained above, the flexible concrete composite material preferably comes as rolled goods. That is, depending on the size of the catch basin, a multitude of adjacent sheets of the flexible concrete composite material will be required for lining its floor and walls.

In order to ensure sufficient impermeability between the sheets, a preferred embodiment of the invention provides for using a joint tape made from the foil-type sealing system for covering a joint remaining between two adjacently ar- ranged sheets of the flexible concrete composite material, which joint tape - after curing of the concrete layer - will be connected to the concrete layer in a liquid-tight and hydrocarbon-resistant manner by means of adhesive bonding.

The joint tape preferably has a width of between 150 mm and 200 mm.

It is particularly preferred that, in addition to the joint tape, the carrier layers between two adjacent sheets of the concrete composite are also bonded to each other by means of thermal welding.

In another embodiment of the invention, the adjacent sheets of the composite material are arranged to overlap one an- other. Preferably, two adjacent sheets have an overlap of more than 10 cm.

Additional advantages, features and possible applications of the present invention will be apparent from the descrip- tion which follows, in which reference is made to the em- bodiments illustrated in the drawings.

Throughout the description, the claims and the drawings, those terms and associated reference signs are used as are stated in the list of reference signs below. In the drawings,

Fig. 1 is an overall view of a catch basin of an LAU plant lined with the sealing structure;

Fig. 2 is an enlarged sectional view of the connection area to a tank;

Fig. 3 is an enlarged sectional view of the connection area to a concrete member;

Fig. 4 is an enlarged sectional view of the connection area to a drain gutter or a drainage channel, and

Fig. 5 is an enlarged sectional view of the transition area between two sheets.

Fig. 1 shows a catch basin, denoted in its entirety by reference numeral 10, of a system for storing, filling and handling substances hazardous to water. Catch basins 10 of this type usually have different attachments arranged in the catch basin 10. Attachments shown in Fig. 1 by way of example only are a tank denoted by reference numeral 12, a concrete member denoted by reference numeral 14, and a drain gutter denoted by reference numeral 16.

The catch basin 10 is sealed in a liquid-tight and hydro- carbon resistant manner by means of a sealing structure 100.

This sealing structure 100 comprises two different sealing systems, namely a flexible concrete composite material 20 in roll form, on the one hand, and a foil-like sealing system 30 on the other hand, see Figs. 2 to 4.

While the flexible concrete composite material 20 is used for the large-area sealing of the floor and walls of the catch basin 10, the foil-like sealing system 30 is intended for sealing the transition regions, i.e. in this case the transition to tank 12, concrete member 14 and drain gutter 16.

The flexible concrete composite material 20 is the Concrete

Canvas Hydro type product and the foil-like sealing system 30 is the MasterProtect 7801 AS type product.

The concrete composite 20 is in roll form. This means, as can be seen from Fig. 1, that the concrete composite material 20 can be laid in the form of a sheet, thus allowing lining of the bottom and walls of the catch basin 10 in a quick and easy manner. In Fig. 1, only two sheets, namely sheet 20A and sheet 20B, are denoted by a reference numeral as an example.

Lining the catch basin with the concrete composite material 20 is performed in such a way that the entire catch basin is essentially lined with the concrete composite material 20, and that only in the immediate area to an attachment, i.e. in this case tank 12, concrete member 14 and drain gutter 16, a connection area 40 remains that is still ex- 10 posed, i.e. not covered by the concrete composite material 20, see Figs. 2 to 4.

As can be seen in particular from Figs. 2 to 5, the concrete composite 20 has a layered structure and essentially com- prises a liquid-impermeable, hydrocarbon-resistant carrier layer 20-1, a water-permeable, UV-resistant top layer 20-2, and a dry concrete layer 20-3 arranged between the carrier layer 20-1 and the top layer 20-2.

After the concrete composite has been applied in the above- mentioned manner to the floor and walls, the dry concrete layer 20-3 is activated by appropriately applying water to the top layer 20-2. After the concrete has set, and thus formed a cured concrete layer, the carrier layers 20-1 of each of two adjacently arranged sheets, see sheets 20A, 20B in Fig. 1, are bonded to each other by means of thermal welding so as to be impermeable to liquids and resistant to hydrocarbons.

The exposed connection areas 40 are then sealed using the foil-type sealing system 30. For this purpose - as shown in

Figs. 2 to 4 - the top layer 20-2 is removed in some areas so as to expose the cured concrete layer. The foil-like sealing system 30 is then arranged in such a way that, on the one hand, the exposed connection area 40 is covered and, on the other hand, an overlap is ensured both with respect to the exposed, hardened concrete layer and with respect to the attachment, i.e. in this case tank 12, concrete member 14 and drain gutter 16.

After the foil-like sealing system 30 has been positioned accordingly, it is connected to the hardened concrete layer and the attachment, i.e. in this case tank 12, concrete member 14 and drain gutter 16, in a liquid-impermeable and hydrocarbon-resistant manner by means of adhesive bonding.

Depending on the geometry of the attachment, it may be nec- essary to cut two adjacent sheets to size so that a gap remains between the sheets, see Fig. 5.

In this case, the foil-type sealing system 30 can also be used in the form of a joint tape to seal the joint. This means that, after forming the hardened concrete layer and removing the cover layer 20-2 in some areas, the joint tape is arranged to cover the joint and attached to the exposed concrete layers in a li-quid-impermeable and hydrocarbon- resistant manner by means of adhesive bonding, see the top view of Fig. 5.

Alternatively, it is also conceivable - provided that an overlapping arrangement of the carrier layers 20-1 was pos- sible - to first connect the carrier layers 20-1 to one another by means of thermal welding after curing, and to then seal the joint in the above-mentioned manner, see the bottom view of Fig. 5.

List o f Reference Signs 10 catch basin 12 tank 14 concrete member 16 drain gutter 20 concrete composite 20A sheet 20B sheet 20-1 carrier layer 20-2 top layer 20-3 dry concrete layer 30 foil-type sealing system 40 exposed area 100 sealing structure

Claims

CONCLUSIONS

1. Sealing structure (100), comprising a foil-like sealing system (30) approved under water legislation and a flexible concrete composite material (20), wherein the concrete composite material (20) consists of a liquid-tight, hydrocarbon-resistant carrier layer (20-1), and wherein the concrete composite material (20) hardens in combination with water and forms a liquid-tight concrete layer, wherein the foil-like sealing system (30) is connected to the hardened concrete layer in a liquid-tight and hydrocarbon-resistant manner by means of bonding.

Sealing structure (100) according to claim 1, characterised in that the concrete composite material (20) is present in rolled form.

Sealing structure (100) according to claim 1 or 2, characterised in that the carrier layer (20-1) of the concrete composite material (20) is thermally weldable.

Sealing structure (100) according to any one of claims 1 to 3, characterised in that the foil-like sealing system (30) approved under water legislation is the product “MasterProtect 7801 AS”.

Sealing structure (100) according to any of claims 1 to 4, characterised in that the flexible concrete composite material (20) is the product “Concrete Canvas Hydro“ or “Concrete Canvas Hydro CCX“.

6. Use of the sealing structure (100) according to any of claims 1 to 5 for sealing a collecting basin (10) in an installation for the storage, filling and transferring of water-polluting substances

(LAU installation).

Use according to claim 5, characterised in that the collecting basin (10) is lined with the flexible concrete composite material (20) on the bottom and wall side, areas (40) around an extension element (12, 14, 16) being recessed from the lining and in that the foil-like sealing system (30) is applied over the areas (40) with recess between the concrete composite material and the extension element (12, 14, 16).

Use according to claim 7, characterised in that the collecting basin (10) is lined on the bottom and wall side by a plurality of adjacently arranged strips (20A, 20B) of the flexible concrete composite material (20).

Use according to claim 8, characterised in that the foil-like sealing system (30) is in the form of a joint strip which is arranged to cover a joint between two adjacently arranged strips (20A, 20B) of the concrete composite material (20).

Use according to claim 8, characterised in that the joint tape has a width of 150 mm - 200 mm.

Use according to claim 8, characterised in that the carrier layer (10-1) of two adjacently arranged strips (20A, 20B) of the concrete composite material (20) are connected to each other by means of thermal welding.

Use according to claim 7, characterised in that after hardening and forming of the concrete layer, the foil-like sealing system covering the recessed areas (40) is bonded to the hardened concrete layer and the extension element (12, 14, 16) in a liquid-tight and hydrocarbon-resistant manner by means of bonding.

Use according to claim 9, characterised in that after hardening and forming of the concrete layer, a joint tape covering a joint between two strips (20A, 20B) is connected to the hardened concrete layer by means of bonding.

Use according to claim 8, characterised in that two adjacent strips (20A, 20B) of the flexible concrete composite material (20) are arranged so as to overlap each other.

Use according to claim 14, characterised in that two adjacent lanes (204, 20B) have an overlap of > 10 cm. -0-0-0-0-0-0-0-0-