EP1416094B1 - A multilayer sealing mat - Google Patents
A multilayer sealing mat Download PDFInfo
- Publication number
- EP1416094B1 EP1416094B1 EP02425614A EP02425614A EP1416094B1 EP 1416094 B1 EP1416094 B1 EP 1416094B1 EP 02425614 A EP02425614 A EP 02425614A EP 02425614 A EP02425614 A EP 02425614A EP 1416094 B1 EP1416094 B1 EP 1416094B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing mat
- layer
- multilayer sealing
- layers
- mat according
- 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.)
- Expired - Lifetime
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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
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
-
- 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
- E02D31/02—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 against ground humidity or ground water
Definitions
- the present invention relates to an article in form of mat, and more precisely to a multilayer mat particularly adapted for making impermeable soil surfaces forming both the bottom flat surfaces and the sloping surfaces of waste dumps, storage basins, irrigation channels, building foundations and other works.
- sealing mats incorporating bentonite between two supporting layers of woven and/or non-woven fabrics: these fabrics having only the purpose of withstanding mechanical stresses and/or chemical attacks, see for example EP 0 278 419 disclosing a mat comprising two layers with a swellable material evenly sandwiched between them and all the three layers needled together.
- DE 198 58 180 discloses a sealing mat comprising a support layer, a cover layer, and a granular or powdery layer of swelling clay disposed between said two layers that are joined to one another by additional connecting elements such as parallel seams arranged so that a distance is maintained between said two layers al over the sealing mat.
- the use is known of geocomposite sealing mats based on sodium-activated bentonite with excellent properties of impermeabilization and mechanical strength.
- the natural sodium bentonite Upon contact with water or ground moisture, the natural sodium bentonite is hydrated and becomes an impermeable gel which can expand more than 16 times its initial volume and increase its weight up 5 times while remaining in a gel condition.
- DE A 42 21 329 discloses a multilayer sealing mat comprising: a substrate supporting layer and a cover layer joined to each other along longitudinal stitchings or sewings, and an interlayer of a swellable material disposed between said two layers, at least one of said supporting and cover layers being of an at least partially biodegradable material.
- an additional porous supporting material is used to hold in place the swellable material.
- biodegradability of the upper layer is rather poor cuts are made for exposing the swellable material to the water action.
- a sealing mat 1 according to the present invention comprises a substrate layer 2, an interlayer 3 of a material capable to swell, particularly in form of granules, and a cover layer 4. Layers 2, 3 and 4 are joined together by needling techniques which form "stitched" portions designated by reference 10.
- the supporting substrate layer 2 is made of a needled non-woven fabric consisting of synthetic fibers, such as for example polypropylene and/or polyester and/or polythene and/or polyamide.
- the swellable intermediate layer 3 preferably comprises clay or bentonite (in form of granular or powdery bentonite with high swelling capacity).
- the cover layer 2 can be of a biodegradable material.
- the biodegradable cover layer 4 is positioned in contact with the soil or the slab to be protected. After coming in contact with water, this layer is degraded and dissolved thus allowing to the bentonite or other swellable material of the interlayer 3 to lie down and fill in the existing hollows and interstices, and the bentonite (or in general the swellable material) thus made free from the containment supporting layer quickly expands and effectively seals the bottom.
- sealing mats are obtained with generally rectangular adjacent elements, where the swellable material 3 can not go out laterally.
- the sealing mats can be for example in the form of square pieces having sizes comprised between cm 60 x 60 and 150 x 150, even with a rectangular shape, or respectively as rolled or lapped strips in containers with sizes between cm 5 and cm 30.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Hydrology & Water Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
- The present invention relates to an article in form of mat, and more precisely to a multilayer mat particularly adapted for making impermeable soil surfaces forming both the bottom flat surfaces and the sloping surfaces of waste dumps, storage basins, irrigation channels, building foundations and other works.
- At present, the impermeabilization of structures laid underground and subjected to chemical attack of the water table such as foundations, underground parking, tunnels, subways, underground railways, containment walls and so on has been accomplished with sealing mats incorporating bentonite between two supporting layers of woven and/or non-woven fabrics: these fabrics having only the purpose of withstanding mechanical stresses and/or chemical attacks, see for example EP 0 278 419 disclosing a mat comprising two layers with a swellable material evenly sandwiched between them and all the three layers needled together.
- DE 198 58 180 discloses a sealing mat comprising a support layer, a cover layer, and a granular or powdery layer of swelling clay disposed between said two layers that are joined to one another by additional connecting elements such as parallel seams arranged so that a distance is maintained between said two layers al over the sealing mat.
- Among the swellable materials, the use is known of geocomposite sealing mats based on sodium-activated bentonite with excellent properties of impermeabilization and mechanical strength. Upon contact with water or ground moisture, the natural sodium bentonite is hydrated and becomes an impermeable gel which can expand more than 16 times its initial volume and increase its weight up 5 times while remaining in a gel condition.
- However in many applications the known bentonite sealing mats do not satisfactorily bind or stick to the materials with which they are in contact. For instance, in the case of cement structures, an adhesion of the cement to the swellable material is strongly required to prevent the forming of channels along which liquids could flow since the cover layer is degradable and would allow the swellable material to expand into the cement unevenness.
DE A 42 21 329 discloses a multilayer sealing mat comprising: a substrate supporting layer and a cover layer joined to each other along longitudinal stitchings or sewings, and an interlayer of a swellable material disposed between said two layers, at least one of said supporting and cover layers being of an at least partially biodegradable material. To prevent displacements of the swellable material that could create voids and thickened areas, an additional porous supporting material is used to hold in place the swellable material. Moreover since the biodegradability of the upper layer is rather poor cuts are made for exposing the swellable material to the water action. - Therefore, it is an object of the present invention to overcome the prior art drawbacks and limitations and more precisely to provide a structure containing bentonite and which actively interfaces with the materials with which it comes into contact.
- These objects are achieved through the present invention which consists of a multilayer sealing mat as claimed in
claim 1. Further advantageous features are recited in the appended claims.
In accordance with the present invention there is used a combination of supporting and containment materials, incorporating at least one layer of a swellable material, in which at least some of the layers are to be implemented, at least partially, through (bio)degradable materials. - The present invention will be disclosed hereinbelow with reference to the attached drawings that illustrate nonlimiting embodiments thereof, in which:
- Fig. 1 is a schematic cross-section view which illustrates the structure of an impermeable sealing mat according to the invention;
- Figs. 2, 3 and 4 show rolls of sealing mat according to the invention in three different configurations thereof;
- Fig. 5 illustrates a process for manufacturing a sealing mat according to the present invention; and
- Fig. 6 illustrates a process for manufacturing a sealing mat according to the present invention and comprising five layers.
-
- Throughout all the Figures, similar or substantially equivalent parts have been designated by the same references.
- With reference to Fig. 1, a
sealing mat 1 according to the present invention comprises asubstrate layer 2, aninterlayer 3 of a material capable to swell, particularly in form of granules, and acover layer 4.Layers reference 10. - Preferably, the supporting
substrate layer 2 is made of a needled non-woven fabric consisting of synthetic fibers, such as for example polypropylene and/or polyester and/or polythene and/or polyamide. - The swellable
intermediate layer 3 preferably comprises clay or bentonite (in form of granular or powdery bentonite with high swelling capacity). - The
cover layer 4 consists of a biodegradable material selected among papers, corrugated paperboards and water-soluble films, non-woven fabrics of natural or synthetic degradable fibers. - According to an alternate embodiment of the invention, also the
cover layer 2 can be of a biodegradable material. - Advantageously, the
biodegradable cover layer 4 is positioned in contact with the soil or the slab to be protected. After coming in contact with water, this layer is degraded and dissolved thus allowing to the bentonite or other swellable material of theinterlayer 3 to lie down and fill in the existing hollows and interstices, and the bentonite (or in general the swellable material) thus made free from the containment supporting layer quickly expands and effectively seals the bottom. - In the embodiment illustrated in Fig. 2, the mat is obtained in form of a material roll with a peripheral needling closing the swellable material laterally and at the mat ends. More precisely, the peripheral edges of the mat strips are closed by a
sewing 10 of the selvages obtained through a needling technique. This needling prevents the powdery or granular bentonite from dispersing during the mat handling so as to ensure its integrity when it is laid down. This closing sewing is obtained by needling the strips of thelayers layers transversal sewing 11 is further realised at the beginning and at the end of the mat roll in order to obtain a complete containment of the swellable material within the mat. - Advantageously, as illustrated in Figs. 3 and 4 other strips joined through needling are (or can be) provided for, in particular the longitudinal stitchings indicated by 12 and transversal stitchings indicated by 13. This way composite or multilayer sealing mats are obtained with generally rectangular adjacent elements, where the
swellable material 3 can not go out laterally. The sealing mats can be for example in the form of square pieces having sizes comprised between cm 60 x 60 and 150 x 150, even with a rectangular shape, or respectively as rolled or lapped strips in containers with sizes between cm 5 and cm 30. - In such a way, a generally improved containment of the swellable material is ensured, particularly when the sealing mat is being cut for laying.
- Fig. 5 schematically illustrates the manufacturing of a sealing mat which comprises a
roll 22 of asubstrate supporting material 2, aroll 24 of acover material 4, and adispenser 23 of aswellable material 3. The rolls ofmaterials material 3 is deposited by gravity and with an appropriate or desired distribution onto the advancingstrip 2, and later on the so formed sandwich passes through aneedle loom 8 with one or more tables for joining the layers according to the configurations illustrated in the Figs. 2-4 or according to others configurations. - According to a further embodiment of the invention, the sealing mat can provide for a further outer auxiliary layer 5 of non-woven fabric or biodegradable material selected among papers, corrugated paperboards and water-soluble films, non-woven fabrics of natural or synthetic degradable fibers, with a
layer 33 of bentonite or other swellable material placed between this auxiliary layer 5 and thesubstrate supporting layer 2. This auxiliary (bottom) section formed bylayers - Fig. 6 schematically illustrates the arrangement for manufacturing such sealing mat equipped with an auxiliary layer, that comprises a
roll 25 of the auxiliary material 5, aroll 22 of asubstrate supporting material 2, aroll 24 of acover material 4, and twodispensers swellable materials - Although the invention has been illustrated with reference to preferred embodiments thereof, it is generally subjected to other applications and modifications which fall within the scope of the invention as will result evident to the skilled of the art.
Claims (8)
- A multilayer sealing mat (1) comprising: a substrate supporting layer (2), a cover layer (4), joined to each other along longitudinal stitchings or sewings (10, 12), and an interlayer of a swellable material (3) disposed between said two layers (2, 4), at least one of said supporting (2) and cover (4) layers being of an at least partially biodegradable material, at least said substrate supporting layer (2) comprising a non-woven needled fabric, and said two layers (2, 4) being joined to each other through needling, characterised in that said biodegradable material is a material selected among papers, corrugated paperboards, water-soluble films and in that said needling extends throughout the whole surface of said two layers (2, 4).
- A multilayer sealing mat according to claim 1 or 2, characterised in that said biodegradable layer is said cover layer (4).
- A multilayer sealing mat according to claims 1, or 2, characterised in that said interlayer of swellable material (3) comprises granular or powdery bentonite.
- A multilayer sealing mat according to the preceding claims, characterised in that said substrate supporting layer (2) comprises a non-woven needled fabric made of synthetic fibers.
- A multilayer sealing mat according to the preceding claims, characterised in that said cover layer (4) comprises a biodegradable non-woven fabrics of natural or synthetic degradable fibers.
- A multilayer sealing mat according to the preceding claims, characterised in that it comprises a further auxiliary outer layer (5) consisting of non-woven fabric or biodegradable material selected among papers, corrugated paperboards, water-soluble films, non-woven fabrics of natural or synthetic degradable fibers, with a further layer (33) of swellable material or bentonite being placed between said auxiliary (5) and supporting (4) layers.
- A multilayer sealing mat according to the preceding claims, characterised in that said needling comprises sewings (10) of the selvages for preventing the dispersion of the powdery or granular bentonite (3, 33) during handling.
- A multilayer sealing mat according to claim 7, characterised in that it is formed as generally rectangular adjacent elements obtained through longitudinal (10, 12) and transversal sewings (11) whereby the swellable material (3) can not escape laterally.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02425614A EP1416094B1 (en) | 2002-10-10 | 2002-10-10 | A multilayer sealing mat |
ES02425614T ES2239214T3 (en) | 2002-10-10 | 2002-10-10 | A MULTICAPA SEALED CARPET. |
DE60203517T DE60203517T2 (en) | 2002-10-10 | 2002-10-10 | Multi-layered sealing mat |
AT02425614T ATE292214T1 (en) | 2002-10-10 | 2002-10-10 | MULTI-LAYER SEALING MAT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02425614A EP1416094B1 (en) | 2002-10-10 | 2002-10-10 | A multilayer sealing mat |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1416094A1 EP1416094A1 (en) | 2004-05-06 |
EP1416094B1 true EP1416094B1 (en) | 2005-03-30 |
Family
ID=32088116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02425614A Expired - Lifetime EP1416094B1 (en) | 2002-10-10 | 2002-10-10 | A multilayer sealing mat |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1416094B1 (en) |
AT (1) | ATE292214T1 (en) |
DE (1) | DE60203517T2 (en) |
ES (1) | ES2239214T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2248959A1 (en) * | 2009-05-05 | 2010-11-10 | Adrian Blödt | Device for liquid-tight covering a building, method for producing a liquid-tight cover and fluid-absorbent element |
CN112878467B (en) * | 2021-01-12 | 2022-05-31 | 新疆大漠奇观生态科技有限公司 | Ecological rainwater collection system of preventing grass is protected to soil moisture along railway |
DE202022103585U1 (en) | 2022-06-28 | 2023-09-29 | Naue Gmbh & Co. Kg | Biodegradable soil sealing membrane |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4221329A1 (en) * | 1992-06-29 | 1994-01-05 | Huesker Synthetic Gmbh & Co | Sealing mat used in building - has bearer layer and cover layer formed by material strips and intermediate layer of swellable material |
DE19649628A1 (en) * | 1996-12-01 | 1998-06-04 | Naue Fasertechnik | Mineral seal construction, manufacturing processes and geosynthetic sealing strip |
DE19738169A1 (en) * | 1997-09-01 | 1999-03-11 | Huesker Synthetic Gmbh & Co | Sealing mat |
DE19827909A1 (en) * | 1998-06-23 | 1999-12-30 | Hans Zauser | Sealing mat for creating a liquid-tight layer in the ground |
DE19858180A1 (en) * | 1998-12-17 | 2000-06-21 | Nabento Vliesstoff Gmbh | Sealing mat and method for manufacturing a sealing mat |
-
2002
- 2002-10-10 DE DE60203517T patent/DE60203517T2/en not_active Expired - Lifetime
- 2002-10-10 AT AT02425614T patent/ATE292214T1/en not_active IP Right Cessation
- 2002-10-10 ES ES02425614T patent/ES2239214T3/en not_active Expired - Lifetime
- 2002-10-10 EP EP02425614A patent/EP1416094B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60203517D1 (en) | 2005-05-04 |
EP1416094A1 (en) | 2004-05-06 |
DE60203517T2 (en) | 2006-02-16 |
ATE292214T1 (en) | 2005-04-15 |
ES2239214T3 (en) | 2005-09-16 |
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