CA2073314A1 - Sealing liner, particularly for eliminating infiltrations - Google Patents
Sealing liner, particularly for eliminating infiltrationsInfo
- Publication number
- CA2073314A1 CA2073314A1 CA002073314A CA2073314A CA2073314A1 CA 2073314 A1 CA2073314 A1 CA 2073314A1 CA 002073314 A CA002073314 A CA 002073314A CA 2073314 A CA2073314 A CA 2073314A CA 2073314 A1 CA2073314 A1 CA 2073314A1
- Authority
- CA
- Canada
- Prior art keywords
- layers
- liner according
- water
- geocompatible
- intermediate support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000008595 infiltration Effects 0.000 title claims description 13
- 238000001764 infiltration Methods 0.000 title claims description 13
- 238000007789 sealing Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000004753 textile Substances 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 239000002759 woven fabric Substances 0.000 claims description 6
- 239000004677 Nylon Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 238000005213 imbibition Methods 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 244000144992 flock Species 0.000 claims description 3
- 231100000252 nontoxic Toxicity 0.000 claims description 3
- 230000003000 nontoxic effect Effects 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 45
- 239000007788 liquid Substances 0.000 description 19
- 235000012216 bentonite Nutrition 0.000 description 9
- 239000012528 membrane Substances 0.000 description 5
- 239000008187 granular material Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 239000004833 fish glue Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 235000013882 gravy Nutrition 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Sewage (AREA)
- Building Environments (AREA)
- Woven Fabrics (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The liner has a composite pack-like structure with an intermediate support made of geocompatible textile material having a high degree of mechanical strength, and two layers of water-expandable material. Each layer of water-expandable material is delimited by further surface containment layers which are also made of highly permeable geocompatible textile material.
The liner has a composite pack-like structure with an intermediate support made of geocompatible textile material having a high degree of mechanical strength, and two layers of water-expandable material. Each layer of water-expandable material is delimited by further surface containment layers which are also made of highly permeable geocompatible textile material.
Description
2 207331-~
The present invention relates to a sealing liner particularly for eliminating infiltrations.
As is known, in many fields of civil and hydraulic engineering there is the problem o~ sealing structures, basins, containment embankments and the like in order to prevent both infiltrations of liquids into the ground and the rise of groundwater.
The sealing o~ collection basins of landfills for solid and liquid urban and industrial waste in order to prevent the infiltration of polluting liquids into the ground is particularly important.
Sealing liners for elimi~ating infiltrations, to be used in combination with membranes or other liquid containment linings, are already known; said liners are constituted by the association of geocompatible textile material and o~ water-expandable material. In the specialized literature, the term "geocompatible textile material" defines a textile product whose physical, mechanical and hydraulic properties are such that it can be used in contaat with the ground. Generally, geocompatible textile materials are constituted by woven fabrics, by non-woven fabrics (hereinafter referred to by the abbreviation NWFl, thick flock felts and nets, all made of a polymeric m~terial, particularly polypropylene, polyester and nylon.
The water-expandable material i typiaally constituted by sodic or calcic bentonite, possibly with additives.
Known liners of the specifîed type are laid directly on the ground, and membranes or other liquid-containment and retention layers are plaaed over them~in the case of tanks, - 2~733~
basins and the like. The essential function of said liners is to prevent leaks of liquid into the ground i~ the membranes split or if the overlying layer cracks, or to prevent the rise o~ groundwater which might generate pressure from below and damage the containment layers or membranes. They also have a mechanical fun~tion of retention and support for the membranes, which generally have modest self-support characteristics.
Currently, said known liners are composed o~ a sandwich with two layers of geocompatible textile material~ The water-expandable material is inserted between the two layers and kept in place by adhesive and/or by long stitches or tacks. The layers o* geocompatible textile material are differentiated, in that one of them, made of tight-mesh woven fabric, or of NWF and the like, has high mechanical strength, to the detriment of permeability, in orde~ to provide the liner with a corresponding mechanical strength, whereas the other layer, generally made of loose-mesh gauze woven fabric, is highly permeable and has the sole purpose o~ containing the layer o~ water-expandable material.
Theæe known liners are installed with theLr permeable face directed toward the neighboring liquid, so that any leaked liquid, by passing through the permeable layer, can reach the bentonite and cause its expansion in order to provide a tight seal.
The greatest problem of these known liners consi~ts of the different degress of permeability of their two sides, ~hich, due to this reason, do not prevent leakage of neighboring liquids towards ~he ground and, at the sa~e 30 time, of any llquids which might rise from; tha gro~nd 2~733~4 itself. Furthermore, since the lining layers are obtained by arranging side by side a plurality of strips o~ said sandwich material unrolled from rolls and by partially overlapping the adjacent strips, due to the different nature of the layers of geocompatible textile material, the mechanically strong and scarcely permeable layer o~ one strip partially overlaps the permeable layer of the adjacent strip in the regions where the strip~ overlap or surmount on~ another. Therefore, in this overlap region, th~ water-expandable material, being compressed between two scarcelypermeable layers, is not reached by any infiltration liquids and thus cannot expand in order to perform its sealing function. The overlap regions of the strips are therefore critical in terms of the impermeability of the layer, and is a further severe problem in the use of kno~n liners.
The aim of the present invention is to eliminate the problems encountered in the use of the known sealing liners.
Within this general aim, an object of the invention is to provide a sealing liner which has great mechanical strength and, at the same time, a similar permeability and therefore a similar ability to absorb and retain infiltrations on both o~ its sides. The liner according to the present invention therefore constitutes an effective barrier both against infiltrations directed toward the ground and against infiltrations which rise from the ground.
~ nother important object of the present invention is to provide a liner which is structured so as to also seal, in the presence of infiltrations, the overlap regions of the adjacent strips which form a sealing layer.
2~7331~
A further important object of the present invention is to provide a liner with selecti~e sealing, wherein the term "selective" defines the ability of the liner to interact with liquids of different kinds so that, for example, on~
side of the liner is suitable to cutoff fre~h-water in~iltrations and the other side is suitable to cuto~
in~iltrations of chemically active liquids or of s~a water or of percolation li~uids.
In order to achieve this aim, thes2 important obiects and others which will become apparent from the following detailed de~cription, the present invention provides a sealing liner, characterized in that it comprises a composite pack-like struckure haYing an intermediate support made of geocompatible textile material with predominant mechanical strength which separates two layers of water-expandable material, each one o~ said two layers being delimited by respective further outer containment layers made of highly permeable geoco~patible textile material.
The intermediate layer is provided so as to impart to zo the liner a high-degree of mechanical strength and sel~-support. The two water-expandable layers are provided in order to give the liner the ability to prevent the pas~age of liquids migrating in opposite directions.
Preferably, the intermediate support is constituted by a flocked geocompatible textile material with a high imbibition power, with a unit weight comprised between 150 and 1000 grams per square meter. ~ layer of NWF based on nylon pretreated in a hot-air oven has been found to be particularly suitable for this purpose.
The material of the expandable layers is ~ypically - 2~7331~
constituted by sodic bentonite (montmorillonite) or calcic bentonite, possibly with the addition of synthetic expanding agents which can be chosen according to the requirQd sensitivity of the layers to specific liquids or compounds dissolved in them.
The outer containment layers are preferably constituted by loose-me~h fabric, typically geocompatible textile gauze, made of spun or flocked polypropylene or polyester.
Preferably, the expandable material is in granular fo~m, with a grain size comprised between 5 and 40 mesh, and is kept in place by tacking and/or by non-toxic adheslves (e.g. fish glues) which prevent said granular material from concentrating by gravi.ty when the liner is installed in vertical or almost vertical arrangements.
Further characteristics and ad~antages will bPcom~
apparent from the following detailed description and with reference to the accompanying drawings, given by way of non~
limitative example, wherein:
figure 1 is an enlarged schematic sectional view of a liner according to the present invention, figure 2 is a schematic plan view of the method for laying strips of liner which form a continuous lining layer;
figure 3 is a highly enlarged sectional view, taken along the plane III-III of figure 2.
In the drawings, the reference numeral 1~ generally designates the liner according to the invention, which is substantially composed of an intermediate geocompatible textile support 11 which separates two layers :12-13 of 2~733~
water-expandable material and of two ~urther outer layers 14 and 15 of permeable geocompati~le textile material ~Jhi~h essentially have the function of containing and retaining the water-expandable material.
The intermediate support 11 has high mechanical-strength characteristics and imparts these characteristics to the liner essentially in order to make it self-supportiny and prevent its collapse in case of installation on vertical or almost vertical walls with slopes of more than 45. For this purpose, the support 11 is preferably made of flock-like geocompatible textile material with high imbibition power and with unit weight comprised between 150 and 1000 grams per square meter. Nylon-flock tight-mesh woven fabric~ r and non-woven fabrics made of the same material, have been found to be particularly suitable ~or the purpose.
In order to increase the imbibition power, said materials are advantageously pre-treated in a hot-air oven with temperatures comprised between 70 and 80C; this treatment forms a surface flocking which has high water retention characteristics.
In order to improve the mechanical characteristics of said support, it can be further reinforced with metallic or geocompatible textile nets~
The layers 12 and 13 of water-expandable material are typically constituted by sodic bentonite (montmorillonite) with a silica percentage comprised between 30 and 70~.
Alternatively, it is possible to use calcic bentonite Qr a mixture of sodic and calcic bentonites. As a furthe~
alternative, one layer may be~made of ~odic ~entonite and 30 the other one may be made of calcic bentonite, in ordar to ---- 2~73~
give said layers the ability to swell in the pres~nce of different liquids, for example sea water and fresh water~
Also in order to make said layers selective to liquids of different kinds, in particular to mixtures of chemically active components and liquids, sodic and/or calcic bentonite can receive the addition of organic expansion agents ch~sen with reference to the type of the above mentioned chemically active components. The material of said water-expandable layers is preferably in a granular form with a grain size comprised be~ween 5 and 40 mesh, advantageously 25 mesh, and the thickness of the layers is comprised between 2 and 8 millimeters. The water-expandable material is contained by the surface layers 14 and 15, which are highly permeable in order to allow the passage of liquids inside the water-expandable layers 12 and 13.
For this purpose, the layers 14 and 15 are made of loose-mesh geocompatible fabric, typically o~ geocompatible gauze woven with polypropylene or polyest~r threads.
Naturally, the "meshes" of said ~abric are finer than the minimum grain size of the water-expandable material, in order to prevent its escape. In order to prevent the concentration of the material of the layers 12 an~ 13, the surface layers 14 and 15 are sewn to the intermediate support 11 with long stitches 16, briefly termed tacks, which substantially form a net for retaining the granular material. In replacement of the tacks, or in addition to them, the granular material o~ the layers 12 and 13 can be treated with a non-toxic adhesive, advankageously with fish glues~
The liner material structured as described above is `` 2~33~
manufactured in strips s whose width is comprised between 1.5 and 5.50 meters and whose length is such that it can be packaged in rolls R which are sufficiently easy to handle.
During installation for the forming of sealed layers, 5 for example of tanks V, basins and the like, ~he adjacent strips Sa-Sb...Sk are partially overlapped, as shown in figur~ 2, where ZSa...ZSk indicate the overlap regions of said strips.
With reference to figure 3, it can be seen that in said overlap regions ZS, in accordance which the stated aim and objects, the water-expandable material of the upper layer 13 of the strip Sa is adjacent to the lower layer 12 of the adjacent strip Sb. The water-expandable material of the two layers is separated only by permeable geocompatible fabrics for the containment of the two water-expandable layers.
There~ore, said layers may be easily reached by the infiltration liquids even in said overlap regions, with the result that the lap joints are able to ensure, in the presence of infiltration liquids, the tightness of said joint by virtue of the expansion of the material of the adjacent layers, indicated by the arrows f in the figurec Naturally, without altering the concept of the invention, the details of execution and the embodiments of the liner may be modified extensi~ely with respect to what is described and illustrated by way o~ non-limitative example without there~y abandoning the scope of the invention.
The present invention relates to a sealing liner particularly for eliminating infiltrations.
As is known, in many fields of civil and hydraulic engineering there is the problem o~ sealing structures, basins, containment embankments and the like in order to prevent both infiltrations of liquids into the ground and the rise of groundwater.
The sealing o~ collection basins of landfills for solid and liquid urban and industrial waste in order to prevent the infiltration of polluting liquids into the ground is particularly important.
Sealing liners for elimi~ating infiltrations, to be used in combination with membranes or other liquid containment linings, are already known; said liners are constituted by the association of geocompatible textile material and o~ water-expandable material. In the specialized literature, the term "geocompatible textile material" defines a textile product whose physical, mechanical and hydraulic properties are such that it can be used in contaat with the ground. Generally, geocompatible textile materials are constituted by woven fabrics, by non-woven fabrics (hereinafter referred to by the abbreviation NWFl, thick flock felts and nets, all made of a polymeric m~terial, particularly polypropylene, polyester and nylon.
The water-expandable material i typiaally constituted by sodic or calcic bentonite, possibly with additives.
Known liners of the specifîed type are laid directly on the ground, and membranes or other liquid-containment and retention layers are plaaed over them~in the case of tanks, - 2~733~
basins and the like. The essential function of said liners is to prevent leaks of liquid into the ground i~ the membranes split or if the overlying layer cracks, or to prevent the rise o~ groundwater which might generate pressure from below and damage the containment layers or membranes. They also have a mechanical fun~tion of retention and support for the membranes, which generally have modest self-support characteristics.
Currently, said known liners are composed o~ a sandwich with two layers of geocompatible textile material~ The water-expandable material is inserted between the two layers and kept in place by adhesive and/or by long stitches or tacks. The layers o* geocompatible textile material are differentiated, in that one of them, made of tight-mesh woven fabric, or of NWF and the like, has high mechanical strength, to the detriment of permeability, in orde~ to provide the liner with a corresponding mechanical strength, whereas the other layer, generally made of loose-mesh gauze woven fabric, is highly permeable and has the sole purpose o~ containing the layer o~ water-expandable material.
Theæe known liners are installed with theLr permeable face directed toward the neighboring liquid, so that any leaked liquid, by passing through the permeable layer, can reach the bentonite and cause its expansion in order to provide a tight seal.
The greatest problem of these known liners consi~ts of the different degress of permeability of their two sides, ~hich, due to this reason, do not prevent leakage of neighboring liquids towards ~he ground and, at the sa~e 30 time, of any llquids which might rise from; tha gro~nd 2~733~4 itself. Furthermore, since the lining layers are obtained by arranging side by side a plurality of strips o~ said sandwich material unrolled from rolls and by partially overlapping the adjacent strips, due to the different nature of the layers of geocompatible textile material, the mechanically strong and scarcely permeable layer o~ one strip partially overlaps the permeable layer of the adjacent strip in the regions where the strip~ overlap or surmount on~ another. Therefore, in this overlap region, th~ water-expandable material, being compressed between two scarcelypermeable layers, is not reached by any infiltration liquids and thus cannot expand in order to perform its sealing function. The overlap regions of the strips are therefore critical in terms of the impermeability of the layer, and is a further severe problem in the use of kno~n liners.
The aim of the present invention is to eliminate the problems encountered in the use of the known sealing liners.
Within this general aim, an object of the invention is to provide a sealing liner which has great mechanical strength and, at the same time, a similar permeability and therefore a similar ability to absorb and retain infiltrations on both o~ its sides. The liner according to the present invention therefore constitutes an effective barrier both against infiltrations directed toward the ground and against infiltrations which rise from the ground.
~ nother important object of the present invention is to provide a liner which is structured so as to also seal, in the presence of infiltrations, the overlap regions of the adjacent strips which form a sealing layer.
2~7331~
A further important object of the present invention is to provide a liner with selecti~e sealing, wherein the term "selective" defines the ability of the liner to interact with liquids of different kinds so that, for example, on~
side of the liner is suitable to cutoff fre~h-water in~iltrations and the other side is suitable to cuto~
in~iltrations of chemically active liquids or of s~a water or of percolation li~uids.
In order to achieve this aim, thes2 important obiects and others which will become apparent from the following detailed de~cription, the present invention provides a sealing liner, characterized in that it comprises a composite pack-like struckure haYing an intermediate support made of geocompatible textile material with predominant mechanical strength which separates two layers of water-expandable material, each one o~ said two layers being delimited by respective further outer containment layers made of highly permeable geoco~patible textile material.
The intermediate layer is provided so as to impart to zo the liner a high-degree of mechanical strength and sel~-support. The two water-expandable layers are provided in order to give the liner the ability to prevent the pas~age of liquids migrating in opposite directions.
Preferably, the intermediate support is constituted by a flocked geocompatible textile material with a high imbibition power, with a unit weight comprised between 150 and 1000 grams per square meter. ~ layer of NWF based on nylon pretreated in a hot-air oven has been found to be particularly suitable for this purpose.
The material of the expandable layers is ~ypically - 2~7331~
constituted by sodic bentonite (montmorillonite) or calcic bentonite, possibly with the addition of synthetic expanding agents which can be chosen according to the requirQd sensitivity of the layers to specific liquids or compounds dissolved in them.
The outer containment layers are preferably constituted by loose-me~h fabric, typically geocompatible textile gauze, made of spun or flocked polypropylene or polyester.
Preferably, the expandable material is in granular fo~m, with a grain size comprised between 5 and 40 mesh, and is kept in place by tacking and/or by non-toxic adheslves (e.g. fish glues) which prevent said granular material from concentrating by gravi.ty when the liner is installed in vertical or almost vertical arrangements.
Further characteristics and ad~antages will bPcom~
apparent from the following detailed description and with reference to the accompanying drawings, given by way of non~
limitative example, wherein:
figure 1 is an enlarged schematic sectional view of a liner according to the present invention, figure 2 is a schematic plan view of the method for laying strips of liner which form a continuous lining layer;
figure 3 is a highly enlarged sectional view, taken along the plane III-III of figure 2.
In the drawings, the reference numeral 1~ generally designates the liner according to the invention, which is substantially composed of an intermediate geocompatible textile support 11 which separates two layers :12-13 of 2~733~
water-expandable material and of two ~urther outer layers 14 and 15 of permeable geocompati~le textile material ~Jhi~h essentially have the function of containing and retaining the water-expandable material.
The intermediate support 11 has high mechanical-strength characteristics and imparts these characteristics to the liner essentially in order to make it self-supportiny and prevent its collapse in case of installation on vertical or almost vertical walls with slopes of more than 45. For this purpose, the support 11 is preferably made of flock-like geocompatible textile material with high imbibition power and with unit weight comprised between 150 and 1000 grams per square meter. Nylon-flock tight-mesh woven fabric~ r and non-woven fabrics made of the same material, have been found to be particularly suitable ~or the purpose.
In order to increase the imbibition power, said materials are advantageously pre-treated in a hot-air oven with temperatures comprised between 70 and 80C; this treatment forms a surface flocking which has high water retention characteristics.
In order to improve the mechanical characteristics of said support, it can be further reinforced with metallic or geocompatible textile nets~
The layers 12 and 13 of water-expandable material are typically constituted by sodic bentonite (montmorillonite) with a silica percentage comprised between 30 and 70~.
Alternatively, it is possible to use calcic bentonite Qr a mixture of sodic and calcic bentonites. As a furthe~
alternative, one layer may be~made of ~odic ~entonite and 30 the other one may be made of calcic bentonite, in ordar to ---- 2~73~
give said layers the ability to swell in the pres~nce of different liquids, for example sea water and fresh water~
Also in order to make said layers selective to liquids of different kinds, in particular to mixtures of chemically active components and liquids, sodic and/or calcic bentonite can receive the addition of organic expansion agents ch~sen with reference to the type of the above mentioned chemically active components. The material of said water-expandable layers is preferably in a granular form with a grain size comprised be~ween 5 and 40 mesh, advantageously 25 mesh, and the thickness of the layers is comprised between 2 and 8 millimeters. The water-expandable material is contained by the surface layers 14 and 15, which are highly permeable in order to allow the passage of liquids inside the water-expandable layers 12 and 13.
For this purpose, the layers 14 and 15 are made of loose-mesh geocompatible fabric, typically o~ geocompatible gauze woven with polypropylene or polyest~r threads.
Naturally, the "meshes" of said ~abric are finer than the minimum grain size of the water-expandable material, in order to prevent its escape. In order to prevent the concentration of the material of the layers 12 an~ 13, the surface layers 14 and 15 are sewn to the intermediate support 11 with long stitches 16, briefly termed tacks, which substantially form a net for retaining the granular material. In replacement of the tacks, or in addition to them, the granular material o~ the layers 12 and 13 can be treated with a non-toxic adhesive, advankageously with fish glues~
The liner material structured as described above is `` 2~33~
manufactured in strips s whose width is comprised between 1.5 and 5.50 meters and whose length is such that it can be packaged in rolls R which are sufficiently easy to handle.
During installation for the forming of sealed layers, 5 for example of tanks V, basins and the like, ~he adjacent strips Sa-Sb...Sk are partially overlapped, as shown in figur~ 2, where ZSa...ZSk indicate the overlap regions of said strips.
With reference to figure 3, it can be seen that in said overlap regions ZS, in accordance which the stated aim and objects, the water-expandable material of the upper layer 13 of the strip Sa is adjacent to the lower layer 12 of the adjacent strip Sb. The water-expandable material of the two layers is separated only by permeable geocompatible fabrics for the containment of the two water-expandable layers.
There~ore, said layers may be easily reached by the infiltration liquids even in said overlap regions, with the result that the lap joints are able to ensure, in the presence of infiltration liquids, the tightness of said joint by virtue of the expansion of the material of the adjacent layers, indicated by the arrows f in the figurec Naturally, without altering the concept of the invention, the details of execution and the embodiments of the liner may be modified extensi~ely with respect to what is described and illustrated by way o~ non-limitative example without there~y abandoning the scope of the invention.
Claims (14)
1. Sealing liner, particularly for eliminating infiltrations, comprising a composite pack-like structure having an intermediate support made of geocompatible textile material with high mechanical strength which separates two layers of water-expandable material which are arranged adjacent to the opposite faces of said intermediate support, and in that each one of said layers of water-expandable material is delimited by further outer layers for the containment of highly permeable geocompatible textile material.
2. Liner according to claim 1, wherein the intermediate support is constituted by flock-like geocompatible textile material with high imbibition power and has a unit weight comprised between 150 and 1000 grams per square meter.
3. Liner according to claim 1, wherein said intermediate support is constituted by a nylon-based woven fabric.
4. Liner according to claim 1, wherein said intermediate support is constituted by a nylon-based non-woven fabric.
5. Liner according to claim 3, wherein said nylon-based intermediate support is treated in a hot-air oven at a temperature comprised between 70 and 80°C.
6. Liner according to claim 1, wherein the water-expandable material of the layers separated by the intermediate support is constituted by sodic and/or calcic bentonite.
7. Liner according to claim 6, wherein organic expansion agents are added to said bentonite.
8. Liner according to claim 6, wherein said water-expandable material is the same for both layers.
9. Liner according to claim 6, wherein the water-expandable material which composes one layer is different from the one which composes the other layer.
10. Liner according to claim 6, wherein the material of the water-expandable layers is in granular form with a grain size comprised between 5 and 40 mesh.
11. Liner according to claim 1, wherein the outside containment layers are constituted by loose-mesh geocompatible woven fabric, typically geocompatible gauze.
12. Liner according to claim 11, wherein said fabric is made of polypropylene threads or flocks.
13. Liner according to claim 11, wherein said fabric is made of polyester threads or flocks.
14. Liner according to claim 1, wherein the material of the expandable layers is kept in place by tacking and/or by non-toxic adhesives.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO910541A IT1249958B (en) | 1991-07-11 | 1991-07-11 | WATERPROOFING COATING, PARTICULARLY FOR THE ELIMINATION OF INFILTRATIONS |
| ITT091A000541 | 1991-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2073314A1 true CA2073314A1 (en) | 1993-01-12 |
Family
ID=11409479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002073314A Abandoned CA2073314A1 (en) | 1991-07-11 | 1992-07-07 | Sealing liner, particularly for eliminating infiltrations |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0522481A1 (en) |
| CA (1) | CA2073314A1 (en) |
| IT (1) | IT1249958B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0624782B1 (en) * | 1993-03-30 | 1998-09-23 | Siemens Aktiengesellschaft | Device for sealing and monitoring a body, in particular a refuse dump |
| AT399740B (en) * | 1993-07-06 | 1995-07-25 | Enertec Isoliermittelgesellsch | Sheet of material for providing a seal against the passage of liquid or moisture |
| FR2707361B1 (en) * | 1993-07-09 | 1995-09-22 | Hutchinson | Water-swelling material seal. |
| DE4418411C1 (en) * | 1994-05-26 | 1995-09-28 | Erhard Fischer | Sealing layer for settling tanks |
| DE69630916T2 (en) * | 1995-05-08 | 2004-05-27 | Amcol International Corp., Arlington Heights | Clay permeable, low permeability geosynthetic mat and method of manufacturing the same |
| US5589257A (en) * | 1995-05-08 | 1996-12-31 | Claymax Corporation | Low permeability geosynthetic clay liner and method of manufacture thereof |
| GB2356880A (en) * | 1999-12-01 | 2001-06-06 | Terram Ltd | Rail support structures and geosynthetics |
| AU2003903547A0 (en) * | 2003-07-10 | 2003-07-24 | Neoferma Australia Pty Ltd | Structures and methods of waterproofing same |
| DE102007057359A1 (en) * | 2007-11-27 | 2009-06-04 | Huesker Synthetic Gmbh | Sealing mat, especially for dike construction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PH13790A (en) * | 1975-10-28 | 1980-10-01 | American Colloid Co | Water barrier panel and method |
| DE3704503C3 (en) * | 1987-02-13 | 1998-02-26 | Naue Fasertechnik | Waterproof sealing mat |
| WO1990014222A1 (en) * | 1989-05-18 | 1990-11-29 | Paramount Technical Products Inc. | Leakproofing for hazardous waste |
-
1991
- 1991-07-11 IT ITTO910541A patent/IT1249958B/en active IP Right Grant
-
1992
- 1992-07-06 EP EP92111402A patent/EP0522481A1/en not_active Withdrawn
- 1992-07-07 CA CA002073314A patent/CA2073314A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| IT1249958B (en) | 1995-03-30 |
| EP0522481A1 (en) | 1993-01-13 |
| ITTO910541A1 (en) | 1993-01-11 |
| ITTO910541A0 (en) | 1991-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |