US20010033774A1 - Geotextile structure for filtration - Google Patents

Geotextile structure for filtration Download PDF

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Publication number
US20010033774A1
US20010033774A1 US09/132,344 US13234498A US2001033774A1 US 20010033774 A1 US20010033774 A1 US 20010033774A1 US 13234498 A US13234498 A US 13234498A US 2001033774 A1 US2001033774 A1 US 2001033774A1
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US
United States
Prior art keywords
geotextile
filtration
layer
decitex
constrictions
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Granted
Application number
US09/132,344
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US6347913B2 (en
Inventor
Philippe Delmas
Olivier Artieres
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BIDIM GEOSYNTHETICS SA
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BIDIM GEOSYNTHETICS SA
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Assigned to BIDIM GEOSYNTHETICS S.A. reassignment BIDIM GEOSYNTHETICS S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARTIERES, OLIVIER, DELMAS, PHILIPPE
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0085—Geotextiles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249981—Plural void-containing components

Definitions

  • the present invention relates to a geotextile structure for filtration.
  • the invention relates to a geotextile structure performing the standard functions for such structures, i.e. the stabilization of soils or of other equivalent materials and which presents, moreover, such filtration properties as to allow passage only of liquids impregnating the soil and not the soil itself or other types of waste.
  • Geotextile stucture used for filtering soils are well known. They are most often constituted by woven or non-woven layers of filaments or of fibers of synthetic materials such as polypropylene, the presence of this structure in contact with the soil, or buried in the soil, ensuring stability thereof.
  • the present invention concerns a structure of this type which, moreover, presents characteristics such that they allow a filtration of the liquids present in the ground.
  • the geotextile structure for filtration is characterized in that it comprises:
  • a lower layer of geotextile material for filtration presenting a number of constrictions n included between 15 and 40 and made of synthetic filaments or fibers presenting a count D (decitex);
  • an upper layer of geotextile material for protection made of synthetic filaments or fibers presenting a count at least equal to 2D (decitex), said upper and lower layers being bonded to each other.
  • this count is equal to 4D (dexitex).
  • the number of constrictions of the lower layer is included between 20 and 35.
  • the count of the filaments of the upper layer is included between 3D (decitex) and 4D (decitex).
  • the single FIGURE shows in vertical section an embodiment of the geotextile filtering structure.
  • this single FIGURE shows a portion of the geotextile structure 10 disposed on a soil 11 to be filtered.
  • the geotextile structure is constituted by a first lower geotextile layer 12 performing the function of filtration and an upper layer 14 , likewise made of geotextile and essentially performing a function of mechanical protection of the lower filtration layer 12 .
  • the lower layer 12 is optimalized in order to optimally perform the function of filtration so that this layer allows the liquids to pass and retains the solid particles forming the skeleton of the soil.
  • the geotextile layer 12 is made from synthetic filaments or fibers and in particular of polypropylene, so that this layer presents in its thickness a number of constrictions included between 15 and 40 and preferably between 20 and 35.
  • the number of constrictions is the number of spaces created by the filaments of the three-dimensional structure between the upper face and the lower face thereof Experiments show that, for this number of constrictions included between 20 and 35, an optimal effect of filtration of the liquid is obtained.
  • the lower layer is made of filaments corresponding to a count advantageously included between 3 and 5 decitex.
  • the upper layer 14 which essentially performs a function of mechanical protection of the lower layer 12 is also made with synthetic filaments or fibers, particularly of polypropylene, which present constrictions much more open than the portion of the lower layer 12 .
  • this layer 14 is made from filaments whose diameter is very substantially larger than that of the lower layer.
  • the count (in decitex) of these filaments is of the order of 2 to 4 times greater than that of the filaments of the lower layer and preferably of the order of 3 to 4 times more.
  • the geotextile structure constituting the upper layer 14 advantageously presents a decitex number included between 12 and 20.
  • the lower filtering layer 12 presents a thickness of between 1.5 and 2.5 mm.
  • the upper layer 14 presents a thickness preferably included between 1.5 and 6 mm. The two layers are bonded together during manufacture.
  • the upper layer 14 a mass and a thickness adapted to the desired level of protection.
  • the thickness may be greater in zone 16 .
  • the geotextile structure 10 comprises a lower layer 12 which is optimalized to perform its function of filtration while the upper layer 14 serves for mechanical protection.
  • the upper layer 14 presents constrictions which are more open with respect to the lower layer, so that, despite the substantially greater diameter of the filaments which constitute it, it does not risk producing the phenomenon of clogging, which situation would prevent the lower layer from performing its function of filtration.

Landscapes

  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Polarising Elements (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Revetment (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

This invention relates to a geotextile structure for filtration, which comprises:
a lower layer of geotextile material for filtration presenting a number of constrictions n included between 15 and 40 and made of synthetic filaments or fibers presenting a count D (decitex); and
an upper layer of geotextile material for protection, presenting constrictions more open that the lower layer and made of synthetic filaments or fibers presenting a count at least equal to 2D (decitex), said upper and lower layers being bonded to each other.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a geotextile structure for filtration. [0001]
  • More precisely, the invention relates to a geotextile structure performing the standard functions for such structures, i.e. the stabilization of soils or of other equivalent materials and which presents, moreover, such filtration properties as to allow passage only of liquids impregnating the soil and not the soil itself or other types of waste. [0002]
    • BACKGROUND OF THE INVENTION
  • Geotextile stucture used for filtering soils are well known. They are most often constituted by woven or non-woven layers of filaments or of fibers of synthetic materials such as polypropylene, the presence of this structure in contact with the soil, or buried in the soil, ensuring stability thereof. [0003]
  • The present invention concerns a structure of this type which, moreover, presents characteristics such that they allow a filtration of the liquids present in the ground. [0004]
  • The technique of filtration with the aid of geotextiles has existed for a long time. The principle consists in retaining the soil to be filtered while allowing the water to pass without pressure drop or with a pressure drop which is a low as possible. Taking into account the granulometry of natural soils, it is not possible to retain all the particles of the soil. This is why the object of the present dimensioning of such filters is only to retain the skeleton of the soil. These are the largest particles of the soil which may retain the finest particles by creation of an “auto-filter” within the soil. This mechanism therefore supposes that, in the geotextile, the finest particles pass therethrough without clogging it. The same applies for the particles of soil in suspension which may come into contact with the geotextile when employed, for example in the presence of mud. [0005]
  • It is generally admitted that the best performances are obtained by needled geotextiles, due to their three-dimensional behaviour. However, as has been demonstrated, the geotextile product must, in order to perform its functions of filtration, present a minimum number of constrictions (i.e. of spaces created by three filaments or more through which the particle of soil must pass) in its thickness, in order to have a high statistical homogeneity of local filtration openings. [0006]
  • However, it has proved that, in order to withstand the aggressions when such a filtration geotextile is used, it is necessary to increase the mass of the product used to obtain the necessary thickness after the damage resulting from employment. This increase in mass, combined with the minimum number of constrictions necessary, has for an effect to considerably increase the risk of internal clogging of the product. It will be appreciated that such a clogging considerably reduces the filtering properties of the geotextile texture. [0007]
  • It is an object of the present invention to provide a geotextile structure which effectively perfoms the desired function of filtration while allowing a sufficient mechanical protection of the structure to ensure integrity thereof when put to use. [0008]
    • SUMMARY OF THE INVENTION
  • To attain this object, according to the invention, the geotextile structure for filtration is characterized in that it comprises: [0009]
  • a lower layer of geotextile material for filtration presenting a number of constrictions n included between 15 and 40 and made of synthetic filaments or fibers presenting a count D (decitex); and [0010]
  • an upper layer of geotextile material for protection made of synthetic filaments or fibers presenting a count at least equal to 2D (decitex), said upper and lower layers being bonded to each other. [0011]
  • For example, this count is equal to 4D (dexitex). [0012]
  • It will be appreciated that, thanks to the combination of the lower layer for filtration, which is optimalized for the purposes of this function, the overall structure effectively performs the function of filtration under the desired conditions. It will also be appreciated that, thanks to the upper layer of synthetic material which presents a mass adapted to the desired resistance, the lower filtration layer is mechanically protected while avoiding the risks of clogging of the filtration layer. [0013]
  • According to a preferred characteristic, the number of constrictions of the lower layer is included between 20 and 35. [0014]
  • Likewise preferably, the count of the filaments of the upper layer is included between 3D (decitex) and 4D (decitex).[0015]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will be more readily understood on reading the following description of a geotextile structure performing the function of filtering, with reference to the accompanying drawings, in which: [0016]
  • The single FIGURE shows in vertical section an embodiment of the geotextile filtering structure.[0017]
    • DESCRIPTION OF PREFERRED EMBODIMENT
  • Referring now to the drawings, this single FIGURE shows a portion of the [0018] geotextile structure 10 disposed on a soil 11 to be filtered. According to an essential feature of the invention, the geotextile structure is constituted by a first lower geotextile layer 12 performing the function of filtration and an upper layer 14, likewise made of geotextile and essentially performing a function of mechanical protection of the lower filtration layer 12.
  • The [0019] lower layer 12 is optimalized in order to optimally perform the function of filtration so that this layer allows the liquids to pass and retains the solid particles forming the skeleton of the soil. To that end, the geotextile layer 12 is made from synthetic filaments or fibers and in particular of polypropylene, so that this layer presents in its thickness a number of constrictions included between 15 and 40 and preferably between 20 and 35. As has already been indicated, the number of constrictions is the number of spaces created by the filaments of the three-dimensional structure between the upper face and the lower face thereof Experiments show that, for this number of constrictions included between 20 and 35, an optimal effect of filtration of the liquid is obtained. Likewise preferably, the lower layer is made of filaments corresponding to a count advantageously included between 3 and 5 decitex.
  • The [0020] upper layer 14 which essentially performs a function of mechanical protection of the lower layer 12 is also made with synthetic filaments or fibers, particularly of polypropylene, which present constrictions much more open than the portion of the lower layer 12. In addition, this layer 14 is made from filaments whose diameter is very substantially larger than that of the lower layer. The count (in decitex) of these filaments is of the order of 2 to 4 times greater than that of the filaments of the lower layer and preferably of the order of 3 to 4 times more. In other words, the geotextile structure constituting the upper layer 14 advantageously presents a decitex number included between 12 and 20.
  • By way of example, the [0021] lower filtering layer 12 presents a thickness of between 1.5 and 2.5 mm. Similarly, the upper layer 14 presents a thickness preferably included between 1.5 and 6 mm. The two layers are bonded together during manufacture.
  • As shown in the single FIGURE, it is possible to provide for the upper layer [0022] 14 a mass and a thickness adapted to the desired level of protection. For example, in the zone where it must withstand an enrockment in the case of protecting a river, a lake or a maritime structure, the thickness may be greater in zone 16.
  • It follows from the above description that the [0023] geotextile structure 10 comprises a lower layer 12 which is optimalized to perform its function of filtration while the upper layer 14 serves for mechanical protection. The upper layer 14 presents constrictions which are more open with respect to the lower layer, so that, despite the substantially greater diameter of the filaments which constitute it, it does not risk producing the phenomenon of clogging, which situation would prevent the lower layer from performing its function of filtration.

Claims (4)

What is claimed is:
1. Geotextile structure for filtration, wherein it comprises:
a lower layer of geotextile material for filtration presenting a number of constrictions n included between 15 and 40 and made of synthetic filaments or fibers presenting a count D (decitex); and
an upper layer of geotextile material for protection, presenting constrictions more open that the lower layer and made of synthetic filaments or fibers presenting a count at least equal to 2D (decitex), said upper and lower layers being bonded to each other.
2. The geotextile structure of
claim 1
, wherein the number of constrictions of the lower layer is included between 20 and 35.
3. The geotextile structure of
claim 1
, wherein the count of the filaments of the upper layer is included between 3D and 4D (decitex).
4. The geotextile structure of
claim 1
, wherein the lower layer corresponds to about 3 to 5 decitex and the upper layer corresponds to about 12 to 20 decitex.
US09/132,344 1997-08-13 1998-08-12 Geotextile structure for filtration Expired - Fee Related US6347913B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9710325A FR2767269B1 (en) 1997-08-13 1997-08-13 GEOTEXTILE FILTRATION STRUCTURE
FR9710325 1997-08-13

Publications (2)

Publication Number Publication Date
US20010033774A1 true US20010033774A1 (en) 2001-10-25
US6347913B2 US6347913B2 (en) 2002-02-19

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US09/132,344 Expired - Fee Related US6347913B2 (en) 1997-08-13 1998-08-12 Geotextile structure for filtration

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US (1) US6347913B2 (en)
EP (1) EP0897793B1 (en)
JP (1) JPH11190017A (en)
AT (1) ATE218099T1 (en)
AU (1) AU744639B2 (en)
DE (1) DE69805578T2 (en)
DK (1) DK0897793T3 (en)
ES (1) ES2178129T3 (en)
FR (1) FR2767269B1 (en)
MY (1) MY123884A (en)
PT (1) PT897793E (en)
SG (1) SG71142A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2531796A (en) * 2014-10-31 2016-05-04 Cha Tech Group Plc A geotextile

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863477B2 (en) * 2003-02-12 2005-03-08 Continental Commercial Products, Llc Method and material for preventing erosion and maintaining playability of golf course sand bunkers

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003643A (en) * 1957-10-28 1961-10-10 Johnson & Johnson Filter media
US4288321A (en) * 1975-10-29 1981-09-08 Beane Frank Thomas Drain tile and pile fabric filter sleeve
US4629651A (en) * 1985-11-14 1986-12-16 Burlington Industries, Inc. Two phase hardy fabric finish
IT1232072B (en) * 1989-03-31 1992-01-23 Saval Srl LOW DEFORMABILITY AND HIGH DRAINING FILTERING COMPOSITE GEOTEXTILE
DE4015505A1 (en) * 1990-05-15 1991-11-21 Hoechst Ag GEOTEXTILE FILTER MATERIAL
US5190406A (en) * 1991-12-13 1993-03-02 Municipal Services Corp. Cationic treatment landfill
DE4212112A1 (en) * 1992-04-10 1993-10-14 Sandler C H Gmbh Multi-layer filter material
DE9320208U1 (en) * 1993-12-31 1994-03-31 Kalthoff Luftfilter und Filtermedien GmbH, 59379 Selm Multi-layer filter material
AUPN037495A0 (en) * 1995-01-05 1995-01-27 Jimboomba Turf Company Pty. Limited Method of and turf product for erosion control
US5651641A (en) * 1995-05-31 1997-07-29 Nicolon Corporation Geosynthetics

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2531796A (en) * 2014-10-31 2016-05-04 Cha Tech Group Plc A geotextile

Also Published As

Publication number Publication date
MY123884A (en) 2006-06-30
US6347913B2 (en) 2002-02-19
DE69805578T2 (en) 2002-11-21
DK0897793T3 (en) 2002-08-19
ATE218099T1 (en) 2002-06-15
AU744639B2 (en) 2002-02-28
AU7993898A (en) 1999-02-25
FR2767269A1 (en) 1999-02-19
ES2178129T3 (en) 2002-12-16
JPH11190017A (en) 1999-07-13
PT897793E (en) 2002-11-29
EP0897793B1 (en) 2002-05-29
DE69805578D1 (en) 2002-07-04
SG71142A1 (en) 2000-03-21
EP0897793A1 (en) 1999-02-24
FR2767269B1 (en) 1999-11-05

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