EP0522481A1 - Sealing liner, Particularly for eliminating infiltrations - Google Patents

Sealing liner, Particularly for eliminating infiltrations Download PDF

Info

Publication number
EP0522481A1
EP0522481A1 EP92111402A EP92111402A EP0522481A1 EP 0522481 A1 EP0522481 A1 EP 0522481A1 EP 92111402 A EP92111402 A EP 92111402A EP 92111402 A EP92111402 A EP 92111402A EP 0522481 A1 EP0522481 A1 EP 0522481A1
Authority
EP
European Patent Office
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.)
Withdrawn
Application number
EP92111402A
Other languages
German (de)
English (en)
French (fr)
Inventor
Elio Faussone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Servizi Ecologici SpA
Original Assignee
Servizi Ecologici SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Servizi Ecologici SpA filed Critical Servizi Ecologici SpA
Publication of EP0522481A1 publication Critical patent/EP0522481A1/en
Withdrawn legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to a sealing liner particularly for eliminating infiltrations.
  • Geocompatible textile material defines a textile product whose physical, mechanical and hydraulic properties are such that it can be used in contact with the ground.
  • geocompatible textile materials are constituted by woven fabrics, by non-woven fabrics (hereinafter referred to by the abbreviation NWF), thick flock felts and nets, all made of a polymeric material, particularly polypropylene, polyester and nylon.
  • NWF non-woven fabrics
  • the water-expandable material is typically constituted by sodic or calcic bentonite, possibly with additives.
  • liners of the specified type are laid directly on the ground, and membranes or other liquid-containment and - retention layers are placed over them in the case of tanks, basins and the like.
  • the essential function of said liners is to prevent leaks of liquid into the ground if the membranes split or if the overlying layer cracks, or to prevent the rise of groundwater which might generate pressure from below and damage the containment layers or membranes. They also have a mechanical function of retention and support for the membranes, which generally have modest self-support characteristics.
  • said known liners are composed of 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 of 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 order 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 of containing the layer of water-expandable material.
  • the water-expandable material being compressed between two scarcely permeable 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 known liners.
  • the aim of the present invention is to eliminate the problems encountered in the use of the known sealing liners.
  • 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 of 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.
  • Another 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.
  • a further important object of the present invention is to provide a liner with selective sealing, wherein the term "selective" defines the ability of the liner to interact with liquids of different kinds so that, for example, one side of the liner is suitable to cutoff fresh-water infiltrations and the other side is suitable to cutoff infiltrations of chemically active liquids or of sea water or of percolation liquids.
  • the present invention provides a sealing liner, characterized in that it comprises a composite pack-like structure having an intermediate support made of geocompatible textile material with predominant mechanical strength which separates two layers of water-expandable material, each one of said two layers being delimited by respective further outer containment layers made of highly permeable geocompatible textile material.
  • the intermediate layer is provided so as to impart to the liner a high-degree of mechanical strength and self-support.
  • the two water-expandable layers are provided in order to give the liner the ability to prevent the passage of liquids migrating in opposite directions.
  • 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.
  • a 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 typically constituted by sodic bentonite (montmorillonite) or calcic bentonite, possibly with the addition of synthetic expanding agents which can be chosen according to the required sensitivity of the layers to specific liquids or compounds dissolved in them.
  • the outer containment layers are preferably constituted by loose-mesh fabric, typically geocompatible textile gauze, made of spun or flocked polypropylene or polyester.
  • the expandable material is in granular form, with a grain size comprised between 5 and 40 mesh, and is kept in place by tacking and/or by non-toxic adhesives (e.g. fish glues) which prevent said granular material from concentrating by gravity when the liner is installed in vertical or almost vertical arrangements.
  • non-toxic adhesives e.g. fish glues
  • the reference numeral 10 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 water-expandable material and of two further outer layers 14 and 15 of permeable geocompatible textile material which 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-supporting and prevent its collapse in case of installation on vertical or almost vertical walls with slopes of more than 45 o .
  • 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 fabrics, and non-woven fabrics made of the same material, have been found to be particularly suitable for the purpose.
  • said materials are advantageously pre-treated in a hot-air oven with temperatures comprised between 70 and 80 o C; this treatment forms a surface flocking which has high water retention characteristics.
  • said support 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%.
  • sodic bentonite montmorillonite
  • calcic bentonite or a mixture of sodic and calcic bentonites.
  • one layer may be made of sodic bentonite and the other one may be made of calcic bentonite, in order to give said layers the ability to swell in the presence of different liquids, for example sea water and fresh water.
  • sodic and/or calcic bentonite can receive the addition of organic expansion agents chosen 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 between 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.
  • the layers 14 and 15 are made of loose-mesh geocompatible fabric, typically of geocompatible gauze woven with polypropylene or polyester threads. Naturally, the "meshes" of said fabric are finer than the minimum grain size of the water-expandable material, in order to prevent its escape.
  • 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.
  • the granular material of the layers 12 and 13 can be treated with a non-toxic adhesive, advantageously with fish glues.
  • the liner material structured as described above is 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.
  • the adjacent strips Sa-Sb...Sk are partially overlapped, as shown in figure 2, where ZSa...ZSk indicate the overlap regions of said strips.

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)
  • Woven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Sewage (AREA)
  • Building Environments (AREA)
EP92111402A 1991-07-11 1992-07-06 Sealing liner, Particularly for eliminating infiltrations Withdrawn EP0522481A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO910541 1991-07-11
ITTO910541A IT1249958B (it) 1991-07-11 1991-07-11 Rivestimento impermeabilizzante, particolarmente per l'eliminazione di infiltrazioni

Publications (1)

Publication Number Publication Date
EP0522481A1 true EP0522481A1 (en) 1993-01-13

Family

ID=11409479

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111402A Withdrawn EP0522481A1 (en) 1991-07-11 1992-07-06 Sealing liner, Particularly for eliminating infiltrations

Country Status (3)

Country Link
EP (1) EP0522481A1 (it)
CA (1) CA2073314A1 (it)
IT (1) IT1249958B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624782A1 (de) * 1993-03-30 1994-11-17 Siemens Aktiengesellschaft Einrichtung zum Abdichten und Überwachen eines Körpers, insbesondere einer Abfalldeponie
EP0633413A1 (fr) * 1993-07-09 1995-01-11 Hutchinson Joint de matière hydrogonflante
AT399740B (de) * 1993-07-06 1995-07-25 Enertec Isoliermittelgesellsch Materialbahn zur abdichtung gegenüber dem durchtritt von flüssigkeit bzw. feuchtigkeit
EP0684345A1 (de) * 1994-05-26 1995-11-29 Erhard Fischer Deponieabdichtung und Verfahren zur Herstellung derselben
EP0742321A1 (en) * 1995-05-08 1996-11-13 Claymax Corporation Low permeability geosynthetic clay liner and method of manufacture thereof
US5776547A (en) * 1995-05-08 1998-07-07 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
WO2005005734A1 (en) * 2003-07-10 2005-01-20 Paul John Lyden A building structure and a method of forming a building structure
DE102007057359A1 (de) * 2007-11-27 2009-06-04 Huesker Synthetic Gmbh Dichtungsmatte, insbesondere für den Deichbau

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4103499A (en) * 1975-10-28 1978-08-01 American Colloid Company Method of forming a water barrier around foundations
EP0278419A2 (de) * 1987-02-13 1988-08-17 NAUE-FASERTECHNIK GMBH & CO. KG Wasserundurchlässige Dichtungsmatte, bestehend im wesentlichen aus einer Trägerschicht, einer Zwischenschicht aus quellfähigem Ton und einer Deckschicht
WO1990014222A1 (en) * 1989-05-18 1990-11-29 Paramount Technical Products Inc. Leakproofing for hazardous waste

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4103499A (en) * 1975-10-28 1978-08-01 American Colloid Company Method of forming a water barrier around foundations
EP0278419A2 (de) * 1987-02-13 1988-08-17 NAUE-FASERTECHNIK GMBH & CO. KG Wasserundurchlässige Dichtungsmatte, bestehend im wesentlichen aus einer Trägerschicht, einer Zwischenschicht aus quellfähigem Ton und einer Deckschicht
WO1990014222A1 (en) * 1989-05-18 1990-11-29 Paramount Technical Products Inc. Leakproofing for hazardous waste

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624782A1 (de) * 1993-03-30 1994-11-17 Siemens Aktiengesellschaft Einrichtung zum Abdichten und Überwachen eines Körpers, insbesondere einer Abfalldeponie
AT399740B (de) * 1993-07-06 1995-07-25 Enertec Isoliermittelgesellsch Materialbahn zur abdichtung gegenüber dem durchtritt von flüssigkeit bzw. feuchtigkeit
EP0633413A1 (fr) * 1993-07-09 1995-01-11 Hutchinson Joint de matière hydrogonflante
FR2707361A1 (fr) * 1993-07-09 1995-01-13 Hutchinson Joint de matière hydrogonflante.
EP0684345A1 (de) * 1994-05-26 1995-11-29 Erhard Fischer Deponieabdichtung und Verfahren zur Herstellung derselben
US5776547A (en) * 1995-05-08 1998-07-07 Claymax Corporation Low permeability geosynthetic clay liner and method of manufacture thereof
EP0742321A1 (en) * 1995-05-08 1996-11-13 Claymax Corporation Low permeability geosynthetic clay liner and method of manufacture thereof
AU695578B2 (en) * 1995-05-08 1998-08-13 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
WO2005005734A1 (en) * 2003-07-10 2005-01-20 Paul John Lyden A building structure and a method of forming a building structure
GB2418681A (en) * 2003-07-10 2006-04-05 Paul John Lyden A building structure and a method of forming a building structure
GB2418681B (en) * 2003-07-10 2007-01-17 Paul John Lyden A building structure and a method of forming a building structure
DE102007057359A1 (de) * 2007-11-27 2009-06-04 Huesker Synthetic Gmbh Dichtungsmatte, insbesondere für den Deichbau

Also Published As

Publication number Publication date
CA2073314A1 (en) 1993-01-12
ITTO910541A0 (it) 1991-07-11
IT1249958B (it) 1995-03-30
ITTO910541A1 (it) 1993-01-11

Similar Documents

Publication Publication Date Title
KR0153780B1 (ko) 기저층, 팽윤성 점토층 및 표지층으로실제로 구성된 물 및 / 또는 오일-불투수성 시일링 매트
US5041330A (en) Water and/or oil-impermeable sealing mat consisting substantially of a substrate layer, a layer of swellable clay and a cover layer
EP0490529B1 (en) Clay liner for steep slopes
US5091234A (en) Composite water barrier sheet
KR0177842B1 (ko) 물 또는 오일 불투과 팽윤성 점토의 밀봉 시이트
KR102520816B1 (ko) 가요성 복합재
EP0522481A1 (en) Sealing liner, Particularly for eliminating infiltrations
ES2978591T3 (es) Geocompuesto y método para la producción del mismo
US5350255A (en) Geosynthetic clay liner with modified edges for improved sealing
JPH0663326U (ja) 遮水シート
US5529438A (en) Geosynthetic clay liner with modified edges for improved sealing
EP0936315B1 (en) Clay liner
CN206110199U (zh) 垂直防渗屏障
KR200367317Y1 (ko) 벤토나이트의 유실방지 구조를 갖는 방수 매트
CN100374288C (zh) 制作防水材料的方法
RU2542525C2 (ru) Противофильтрационный экран и способ его создания
JP2004197425A (ja) ベントナイトを用いた遮水工法
JPH0641686B2 (ja) 埋立てにおける遮水シートの敷設方法
JP2502251Y2 (ja) トンネル工事用止水シ―ト
RU2008146188A (ru) Осушительный мат
JPH07214026A (ja) 漏水の検知修復に使用する検知修復体及び漏水検知修復方法
JPH09206513A (ja) 袋詰脱水用縫製袋
JP3037726U (ja) ゴミ処理場における排水・ガス抜きを兼ねた保護マット材
JPH11319748A (ja) 廃棄物処分場における排水層を用いた遮水設備
KR200318744Y1 (ko) 토목섬유점토차수재

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR LI NL SE

17P Request for examination filed

Effective date: 19930624

17Q First examination report despatched

Effective date: 19940727

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19950207