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EP2292845B1 - Matériel géosynthétique pour le renforcement d'un sol - Google Patents

Matériel géosynthétique pour le renforcement d'un sol Download PDF

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Publication number
EP2292845B1
EP2292845B1 EP20090009646 EP09009646A EP2292845B1 EP 2292845 B1 EP2292845 B1 EP 2292845B1 EP 20090009646 EP20090009646 EP 20090009646 EP 09009646 A EP09009646 A EP 09009646A EP 2292845 B1 EP2292845 B1 EP 2292845B1
Authority
EP
European Patent Office
Prior art keywords
strips
tips
geosynthetic
grid
web
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.)
Not-in-force
Application number
EP20090009646
Other languages
German (de)
English (en)
Other versions
EP2292845A1 (fr
Inventor
Karel Pospisil
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.)
Centrum Dopravniho Vyzkumu VVI
Original Assignee
Centrum Dopravniho Vyzkumu VVI
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 Centrum Dopravniho Vyzkumu VVI filed Critical Centrum Dopravniho Vyzkumu VVI
Priority to EP20090009646 priority Critical patent/EP2292845B1/fr
Publication of EP2292845A1 publication Critical patent/EP2292845A1/fr
Application granted granted Critical
Publication of EP2292845B1 publication Critical patent/EP2292845B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/202—Securing of slopes or inclines with flexible securing means

Definitions

  • the present invention relates to a geosynthetic material forming a layer used for reinforcing the base course.
  • geosynthetics used in the ground body has been known in the art for a long time.
  • the reinforcing function is also useful. Fills of subgrades for roadways and railways, which are reinforced by geosynthetics, are widely used applications of reinforcing geosynthetic materials.
  • the reinforcing function of geosynthetics understood as a tool for increasing the load-bearing capacity of poor bearing grounds, as mentioned in the literature, is unverifiable in some specific cases. This may be caused by the above mentioned separating function o geosynthetics where the individual layers of the ground body do not act as an aggregate unit but rather as independent, separated layers.
  • US 4,472,086 discloses a geogrid wherein the fibres extending in one direction, i.e. either in the longitudinal or in the transversal direction, are wrapped by an additional fibre that forms loops in the points where knots are situated. Although this enables to make the entire area rougher, the technological procedure used is arduous and the roughing effect achieved in not sufficient.
  • EP 1 458 912 B1 discloses a geogrid wherein the fibres are formed by braids made of multiple fibres and having the shape of spherical elements in the points where knots are situated. Although this enables to make the entire area rougher, the technological procedure used is arduous and the roughing effect achieved in not sufficient. A similar grid is disclosed in DE 4123055 .
  • EP 0 333 576 B1 discloses a geogrid wherein the fibres are formed by strips that are twisted in one direction, forming spindle-shaped segments. This enables to achieve such arrangement where the strips are partly oriented with respect to the plane of the geosynthetic material.
  • the production of such geogrid is demanding and an increased volume of the geogrid must be handled when the latter is coiled.
  • Document DE 92 15 568 U1 presents geosyntetics in the form of a grid and the flat strips are provided with perpendicular tips which are placed on the upper surface of the strips and they are orientated in the diretion up from the ground. In the crossings of the strips there are no tips and there are openings through which fixaxtion pins are protruded to fasten the geosyntertics to the ground. The tips have the role to make the surface more rough for fixation of grass and other plantings. The fastening to the round is secured by the additional pins.
  • the aim of the invention is to provide a geosynthetic grid comprising a transversal element that would be large enough for stabilizing the grid on soft, small-grained grounds, wherein such transversal element would neither restrain the rolls from being coiled up nor increase the volume of the rolls.
  • the tips are continuously arranged either only on the longitudinal strips of the web or on the transversal ones.
  • the tips are discontinuous with interruptions in the areas of the knots of the web.
  • Such geogrid can be readily coiled onto rolls.
  • Fig. 1 shows a schematic view of one mesh of the geosynthetic grid with stabilizing tips according to the invention
  • Fig. 2 shows the magnified detail of section A-A led through one strip of the grid shown in Fig. 1 , where the tip is in its working position
  • Fig. 3 presents the same detail, where the tip is in its transporting position.
  • the geosynthetic grid which is the subject of the present invention, is composed of a synthetic material, such as polyester.
  • Fig. 1 shows a schematic view of one mesh 1 of the geosynthetic grid with stabilizing tips 3, said tips being shown in the top view.
  • Each mesh 1 comprises a first pair of longitudinal strips 2 and a second pair of transversal strips 2 extending perpendicularly with respect to said first pair.
  • the transversal and longitudinal strips 2 are joint together in a known manner.
  • the entire grid may be produced by press moulding, e.g. of a geomembrane. In both cases, the transversal and longitudinal strips 2 contact each other within the knots 4.
  • the stabilizing tips 3 may either compose a part of the respective longitudinal or transversal strip 2 - in case that the geosynthetics is made in the way of subsequent joining the longitudinal or transversal strips within the knots 4 - or may be additionally attached to the longitudinal or transversal strips, e.g. by glueing or by means of a thermal process - in case that the geogrid is made as a whole by press moulding, wherein the workpiece is a solid planar element, such as a geomembrane.
  • Fig. 2 contains a sectional view of a strip 2 with a tip 3 attached to it. As seen in the figure, the tip 3 is arranged substantially in a position where it is perpendicular with respect to the plane of the strip 2.
  • the tip 3 is pressed against the plane of the strip 2 by the upper layer of the geosynthetic grid when the latter is in the coiled condition.
  • the released tips 3 return their original upright position owing to their inherent recovering capacity.
  • the geogrid is then laid onto the subsoil with its upright and activated tips 3 pointing towards the subsoil. Subsequently, the effect of rolling the grid causes the tips 3 to bite into the underlying surface, thus stabilizing the position of the whole geogrid and preventing the same from undesirable sliding movement and displacement.
  • the tips 3 are discontinuous and do not extend up to the area of the knots 4, thus not hampering each other when the grid is being coiled for the purpose of transportation.
  • the resolution of the missing interaction of a poor bearing subsoil (typically with E def,2 ⁇ 10 MPa ) reinforced by the geosynthetic grid according to the invention consist in the application of the geosynthetic equipped with the tips 3 by means of which the geosynthetic can burrow into the above type of subsoil.
  • the tips 3 pose a part of the geosynthetic, which is composed of a geosynthetic grid in the particular case, and are made of the same material as the geosynthetic grid is or of a different material.
  • the strips 3 are tilted in such a manner that they lean towards the plane of the strips 2 making up the geosynthetic grid.
  • the tips 3 take up the upright position so that they become perpendicular with respect to the plane of the strips 2 making up the geosynthetic grid.
  • the tips 3 bite into the subsoil, thus ensuring the desired interaction of the geosynthetic with the subsoil.
  • the pavement bases, railway substructures or the like are laid onto the geosynthetic by means of usual techniques.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Claims (4)

  1. Grille géosynthétique aux rayures (2) sous forme de la grille pourvue d'un côté des lames de stabilisation (3) faisant partie intégrante des rayures (2) ou étant fixées de manière rigide aux rayures (2), par exemple par collage ou de façon thermique, caractérisée en ce que les lames (3) ont la mémoire de forme et sont disposées sur le côté inférieur des rayures (2) les lames (3) étant pliées en direction de la surface inférieure des rayures (2) lorsque les lames (3) sont en position de stockage, et perpendiculaires au plan de la surface inférieure des rayures (2) en position de travail.
  2. Grille géosynthétique selon la revendication 1, caractérisée en ce que les lames (3) ne sont disposées de manière continue que sur les rayures longitudinales (2) de la chaîne.
  3. Grille géosynhétique selon la revendication 1, caractérisée en ce que les lames (3) ne sont continues que sur les rayures transversales (2) de la chaîne.
  4. Grille géosynthétique selon les revendications 1 et 2, caractérisée en ce que les lames (3) sont discontinues et sont interrompues au niveau des noeuds (4) de la chaîne sur la surface inférieure de la chaîne.
EP20090009646 2009-07-25 2009-07-25 Matériel géosynthétique pour le renforcement d'un sol Not-in-force EP2292845B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090009646 EP2292845B1 (fr) 2009-07-25 2009-07-25 Matériel géosynthétique pour le renforcement d'un sol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090009646 EP2292845B1 (fr) 2009-07-25 2009-07-25 Matériel géosynthétique pour le renforcement d'un sol

Publications (2)

Publication Number Publication Date
EP2292845A1 EP2292845A1 (fr) 2011-03-09
EP2292845B1 true EP2292845B1 (fr) 2013-11-06

Family

ID=41172357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090009646 Not-in-force EP2292845B1 (fr) 2009-07-25 2009-07-25 Matériel géosynthétique pour le renforcement d'un sol

Country Status (1)

Country Link
EP (1) EP2292845B1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472086A (en) 1981-02-26 1984-09-18 Burlington Industries Inc. Geotextile fabric construction
FR2628771B1 (fr) 1988-03-18 1992-06-12 Inst Textile De France Materiau tridimensionnel pour le renforcement des sols
DE4123055A1 (de) 1991-07-12 1993-01-14 Synteen Gewebe Technik Gmbh Verfahren zum herstellen eines armierungsgewebes fuer insbesondere strassenbelaege
DE9215568U1 (de) 1992-11-16 1993-01-14 Pieper, Rolf, 5600 Wuppertal Böschung - Verankerungs - Netz
ES2154301T3 (es) * 1993-10-22 2001-04-01 Ile Des Brevets Henri Vidal So Tira para uso en estructuras de tierra estabilizada.
DE10245503A1 (de) 2002-09-27 2004-04-08 Huesker Synthetic Gmbh Gittergewebe

Also Published As

Publication number Publication date
EP2292845A1 (fr) 2011-03-09

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