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WO1997036059A1 - Geotextile - Google Patents

Geotextile Download PDF

Info

Publication number
WO1997036059A1
WO1997036059A1 PCT/GB1997/000792 GB9700792W WO9736059A1 WO 1997036059 A1 WO1997036059 A1 WO 1997036059A1 GB 9700792 W GB9700792 W GB 9700792W WO 9736059 A1 WO9736059 A1 WO 9736059A1
Authority
WO
WIPO (PCT)
Prior art keywords
geotextile
laminate
core material
channel
layer
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.)
Ceased
Application number
PCT/GB1997/000792
Other languages
English (en)
Inventor
David Arthur Shercliff
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.)
Geofabrics Ltd
Original Assignee
Geofabrics Ltd
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
Priority claimed from GBGB9606103.1A external-priority patent/GB9606103D0/en
Application filed by Geofabrics Ltd filed Critical Geofabrics Ltd
Priority to AU20373/97A priority Critical patent/AU2037397A/en
Publication of WO1997036059A1 publication Critical patent/WO1997036059A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
    • E02B3/127—Flexible prefabricated covering elements, e.g. mats, strips bags filled at the side

Definitions

  • This invention relates to a geotextile, and particularly, but not exclusively, to a geotextile which may be used in a land fill site to allow transmission of gases and/or liquids through the textile.
  • a land fill site is created by filling in such a site with, for example, domestic waste and then capping the filled site with a membrane.
  • a membrane may be used either at the base of the land fill and / or to cap a land fill.
  • the membrane is typically formed from a high density polyethylene liner having a thickness of between about 1 mm and 25 mm.
  • the membrane When the membrane is used to cap the land fill it usually has a thickness towards the lower end of this range, and when it is used as a base of a land fill it has a thickness towards the upper end of the range.
  • the membrane is an impermeable sheet which is typically heat jointed and which seals a land fill site from its surroundings. A small puncture in the membrane would mean uncontrolled escape of gas which could lead to explosions occurring.
  • Membranes may be made from for example polyethylene, polypropylene, polyamide or butyl rubber.
  • Land fill sites often produce a build up of gas and/or liquid, and it is essential that any such gas and/or liquid be collected and drawn off from the capped land fill site. Particularly, in the case of a build up of gases, if such gases are not allowed to escape, then explosions may occur.
  • the geotextile material may be used to cap a land fill site and is positioned over the land, and below a membrane which seals the site. Gases and/or liquids may be transmitted away from the land fill site through the pipes which have been incorporated into the geotextile material.
  • the pipes can sometimes be flattened by installation construction traffic and by high pressures when used for example at the base of a land fill. This causes the pipe to become blocked thus preventing the pipe from allowing gas and / or liquid to be collected and drawn off from the site. This can result in a dangerous build up of gases.
  • a geotextile laminate comprising: a layer of geotextile material; at least one channel formed within the layer.
  • the at least one channel may be used for gas/liquid transmission.
  • the at least one channel may be used to receive ballast in the form of, for example, steel rods. This has the effect of increasing the weight of the geotextile and allowing the composite structure to be used to line a seabed. Without the ballast inserted in the at least one channel, the geo extile would float above the seabed. The ballast causes the fabric to sink to the seabed.
  • Positioning the geotextile on, for example, a seabed or river bed protects the bed from erosion.
  • the geotextile layer comprises two or more geotextile materials forming a composite layer.
  • each of the two or more materials comprises a needle punched fabric.
  • each of the two or more needle punched fabrics are needled together to form a composite layer.
  • the composite layer has properties originating from each of the two or more materials used to form the composite.
  • the at least one channel is formed by leaving a portion of the composite material un-needled.
  • the geotextile laminate comprises a plurality of channels spaced apart from one another along the width of the material and extending substantially along the length of the material .
  • the geotextile laminate further comprises a plurality of lengths of core material each of which is receivable in a respective sleeve.
  • the core material is an extruded material and may be formed from any suitable material, for example, polyethylene.
  • the extruded core material ha ⁇ a thermally preformed zig-zag or corrugated configuration.
  • the core material may be made from polyethylene when high chemical resistance is required.
  • the core material could be made from for example polyester and polyamide.
  • the core material may be cut into any desired width for example up to a maximum width of 5 metres.
  • the core material is wrapped in a light heat bonded continuous non-woven material which non-woven material forms a sleeve around the core material.
  • Longitudinal jointing of the core and the sleeve may be easily achieved by slotting the core inside the sleeve.
  • the core material when wrapped in the sleeve serves as a gas and/or liquid transmitter and allows gas and/or liquid to be transmitted away from a land fill site.
  • the sleeve may be formed from any of a wide range of polymers such as a polyester / polyamide blend, polyester, polypropylene or polyethylene.
  • the sleeve may be supplied in place around the core material and may be preformed or supplied in strip form.
  • it may be supplied separately on a roll, it may then be laid on site or may be needled to another fibre.
  • a method of forming a geotextile laminate comprising the steps of: needling together two or more separate layers of fabric; leaving portions of the composite material needled to form at least one channel; inserting into the at least one channel a core material.
  • Figure 1 is a schematic representation of a cross section of a geotextile material according to the present invention
  • Figure 2 is a schematic representation showing how the material of Figure 1 is manufactured
  • Figure 3 is a schematic representation showing a stage in the manufacture of the material of Figure 1;
  • Figure 4 is a schematic representation of a land fill site capped with a membrane
  • Figure 5 is a schematic representation of a water lagoon having a membrane at the base of the lagoon.
  • Figure 6 is a schematic representation of a second embodiment of the invention used to line a seabed.
  • a geotextile material according to the present invention is designated generally by the reference numeral 1.
  • the material 1 comprises a composite material 2 which has been formed from two or more layers of non-woven staple fibre.
  • a staple fibre may be used to make a staple fibre.
  • Staple fibres are made by extruding thin strands of polymer, crimping the extruded polymer and then cutting the polymer.
  • the length of fibre, diameter of fibre, crimp of fibre and polymer type may all be varied to produce a staple fibre having appropriate qualities.
  • the staple fibre may include varying amounts of carbon black the presence of which provides UV resistance to the staple fibre. By appropriately varying these parameters, a particular property may be optimised. For example the puncture resistance of the fibre may be maximised or the permeability of the fibre may be increased.
  • the at least two layers of non-woven staple fibre are needled together. Areas are left un-needled and these areas form channels which are spaced apart from one another across the width of the material and extend along the length of the material.
  • Sleeves 3 are positionable within the channels, and each contain an extruded core material 4. Each sleeve 3 is formed from a light heat bonded non-woven continuous filament 5.
  • the material 1 has high puncture resistance provided by the punched non-woven material. In addition it has a high transmission capacity due to the presence of the cores 4. Further, the material has a relatively flat construction which means that it is easy to handle. For example, it is easy to roll up for storage and transport. In addition it reduces the strain on any membrane placed over the material 1.
  • the material 1 is particularly useful for gas or liquid transmission, for example, in a land fill site which has been capped in which gas builds up beneath the cap.
  • FIG. 2 the manufacturing process is schematically illustrated. Two non-woven pieces of fabric are needled together by needles 20. Needles 20 are positioned such that there are spaces 21 where no needles are present. Sleeves 3 are positioned in the channels formed by spaces 21.
  • An adapted needle board 30 in which the needles are positioned as shown in Figure 2 is used to needle together the two or more layers of non-woven fabric 31 which together form the composite layer 2.
  • An extruded core material made of, for example, polyethylene and contained within a sleeve 3 is inserted between the two layers 31 as they are needled together and positioned in the areas formed by the absence of needles 21 ( Figure 2) which define channels.
  • the extruded core material is corrugated and is positioned within a sleeve 3.
  • a land fill site is designated generally by the reference numeral 40.
  • the land fill site 40 is created by filling a cavity 41 with domestic waste.
  • a membrane 42 formed from an impermeable material is placed over the land fill site in order to seal the site.
  • a geotextile laminate 43 of the type illustrated in Figure 1 is positioned over the land fill site before the capping membrane 42 is positioned over the laminate 43.
  • the presence of a laminate 43 allows liquid and / or gases to be collected and drawn off at draw point 44.
  • the drawn off gas may be burnt off. Liquid including condensate may be allowed to drain into the surrounding earth.
  • a soil cover 45 is formed over the membrane 42.
  • the laminate 43 protects the underside of the membrane 42 from puncture by waste. In addition the laminate vents the gases positively away from the underside of the cap to draw off point 44, this allows controlled venting of gases.
  • a water lagoon is designated generally by the reference numeral 50.
  • a laminate 51 of the type described hereinabove with reference to Figure 1 is positioned over the ground where the lagoon is to be formed.
  • a membrane 52 of the type described hereinabove with reference to Figure 4 is positioned over the laminate 51.
  • the laminate 51 allows naturally occurring gases to be vented off into the ground 53. This prevents gases from bubbling up under the membrane which could cause puncturing of the membrane. This is particularly likely to happen when the water level is low. Almost any two or more needled punched geotextiles may be needled together in combination.
  • the transmitters may be formed from any one of a wide range of heat bonded geotextiles and core materials.
  • the geotextile 60 comprises two layers of fabric needle punched together in a similar way to that described hereinabove with reference to Figure 1.
  • the channels of sleeves 3 are filled with the ballast rather than an extruded core material 4.
  • the ballast may be, for example, steel rods which rods may be inserted into the sleeves 3 which run along the length of the role of geotextile material.
  • the resulting composite material may be used to line a seabed.
  • the insertion of ballast into the sleeves 3 allows the fabric to sink to the sea or river bed. Without the ballast the fabric will float as it is made from polypropylene whose specific gravity is 0.92.
  • HDPE High Density Polyethelene

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Laminated Bodies (AREA)

Abstract

Stratifié de géotextile (1) composé d'une couche de matériau géotextile (2), ainsi que d'au moins un canal (3) situé à l'intérieur de la couche (2). Cette couche (2) comporte un matériau composite obtenu à partir de non tissés (31) cousus ensemble. Les gaines (3) sont placées à l'intérieur de l'un ou de plusieurs des canaux et contiennent chacune un matériau central extrudé.
PCT/GB1997/000792 1996-03-22 1997-03-21 Geotextile Ceased WO1997036059A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20373/97A AU2037397A (en) 1996-03-22 1997-03-21 Geotextile

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9606103.1A GB9606103D0 (en) 1996-03-22 1996-03-22 Geotextile
GB9606103.1 1996-03-22
GB9611419.4 1996-05-31
GB9611419A GB2311248B (en) 1996-03-22 1996-05-31 Geotextile

Publications (1)

Publication Number Publication Date
WO1997036059A1 true WO1997036059A1 (fr) 1997-10-02

Family

ID=26308981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000792 Ceased WO1997036059A1 (fr) 1996-03-22 1997-03-21 Geotextile

Country Status (2)

Country Link
AU (1) AU2037397A (fr)
WO (1) WO1997036059A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356880A (en) * 1999-12-01 2001-06-06 Terram Ltd Rail support structures and geosynthetics
FR2899913A1 (fr) * 2006-04-14 2007-10-19 Jean Cornic Dispositif destine a freiner et retenir le flux de sediments le long du littoral ainsi qu'un procede d'injection de granulats dans un tel dispositif
WO2008009882A3 (fr) * 2006-07-15 2008-03-27 Wtb Group Ltd Structure de confinement
US8978995B2 (en) 2009-05-14 2015-03-17 Geofabrics Limited Trackbed liner and related methods

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696623A (en) * 1968-07-30 1972-10-10 Hoechst Ag Woven mat
US3699686A (en) * 1968-11-12 1972-10-24 Nicolon Nv Bottom and bank facing mattress
US4966492A (en) * 1986-09-27 1990-10-30 Dynamit Nobel Aktiengesellschaft Flexible sealing sheet
EP0606700A1 (fr) * 1992-12-16 1994-07-20 Amcol International Corporation Barrière d'eau formée d'un argile-fibre matelas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696623A (en) * 1968-07-30 1972-10-10 Hoechst Ag Woven mat
US3699686A (en) * 1968-11-12 1972-10-24 Nicolon Nv Bottom and bank facing mattress
US4966492A (en) * 1986-09-27 1990-10-30 Dynamit Nobel Aktiengesellschaft Flexible sealing sheet
EP0606700A1 (fr) * 1992-12-16 1994-07-20 Amcol International Corporation Barrière d'eau formée d'un argile-fibre matelas

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356880A (en) * 1999-12-01 2001-06-06 Terram Ltd Rail support structures and geosynthetics
FR2899913A1 (fr) * 2006-04-14 2007-10-19 Jean Cornic Dispositif destine a freiner et retenir le flux de sediments le long du littoral ainsi qu'un procede d'injection de granulats dans un tel dispositif
WO2007119002A1 (fr) * 2006-04-14 2007-10-25 Jean Cornic Dispositif destine a freiner et retenir le flux de sediments et procede d'injection de granulats dans un tel dispositif
WO2008009882A3 (fr) * 2006-07-15 2008-03-27 Wtb Group Ltd Structure de confinement
RU2435893C2 (ru) * 2006-07-15 2011-12-10 Втб Груп Лимитед Удерживающая структура
US8978995B2 (en) 2009-05-14 2015-03-17 Geofabrics Limited Trackbed liner and related methods

Also Published As

Publication number Publication date
AU2037397A (en) 1997-10-17

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