EP2050879B1 - Bande de stabilisation destinée à être utilisée dans des ouvrages en sol renforcé - Google Patents

Bande de stabilisation destinée à être utilisée dans des ouvrages en sol renforcé Download PDF

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Publication number
EP2050879B1
EP2050879B1 EP08166646A EP08166646A EP2050879B1 EP 2050879 B1 EP2050879 B1 EP 2050879B1 EP 08166646 A EP08166646 A EP 08166646A EP 08166646 A EP08166646 A EP 08166646A EP 2050879 B1 EP2050879 B1 EP 2050879B1
Authority
EP
European Patent Office
Prior art keywords
strip
notches
stabilizing strip
stabilizing
central part
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
EP08166646A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2050879A1 (fr
Inventor
Jean-Claude Morizot
Nicolas Freitag
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.)
Terre Armee Internationale
Original Assignee
Terre Armee Internationale
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 Terre Armee Internationale filed Critical Terre Armee Internationale
Priority to PL08166646T priority Critical patent/PL2050879T3/pl
Publication of EP2050879A1 publication Critical patent/EP2050879A1/fr
Application granted granted Critical
Publication of EP2050879B1 publication Critical patent/EP2050879B1/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
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/02—Retaining or protecting walls
    • E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
    • E02D29/0241—Retaining or protecting walls comprising retention means in the backfill the retention means being reinforced earth elements

Definitions

  • the present invention relates to a stabilization strip for use in structures reinforced soil or armed land, and the use of such a strip for the construction of structures reinforced soil or ground.
  • a reinforced soil structure combines a compacted embankment, a siding and reinforcements connected or not to the facing.
  • metal reinforcements for example galvanized steel rods, or flexible stabilizing strips, for example based on polyester fibers. They are placed in the soil with a density depending on the constraints that can be exerted on the structure. For example, the thrust forces of the ground that are taken up by the friction soil-reinforcements.
  • the facing is most often made from prefabricated concrete elements in the form of slabs or blocks, juxtaposed to cover the front face of the structure.
  • the reinforcements are provided in the form of substantially parallelepipedal flexible strips, for example, all of whose faces are rectangles. Commonly such strips have a width greater than their thickness, for example ten times larger, or even 100 times larger.
  • Such flexible strips may have a length of about 3 to 10 meters, although shorter or longer strips may be employed.
  • the width of such strips is generally between 4 and 6 centimeters although it is possible to use strips width of up to 10 or 25 centimeters, or even more.
  • Their thickness varies, for example, from about 1 millimeter to a few centimeters and is generally between 1 to 6 millimeters.
  • stabilization bands unreinforced or reinforced by means of, for example, fibers or parallel threads.
  • the purpose of the stabilization strips is to transmit the forces into the ground or earth and thus distribute the forces.
  • the band is preferably capable of transmitting the forces along its entire length, allowing a high tensile strength.
  • a solution known to those skilled in the art consists in using parallelepiped strips of polyethylene reinforced with polyester fibers arranged parallel to each other in the volume of said strip.
  • WO 95/11351 Another solution, described in WO 95/11351 is to use strips having a longitudinal portion in the form of a central portion to withstand a tensile force.
  • the central part has two lateral parts which protrude laterally on either side of the central part to rub against the earth.
  • the central portion also includes a set of fibers arranged to enhance the tensile strength.
  • stabilization band is described in WO 2007/086634 .
  • stabilizing bands in structures with reinforced soil may present difficulties especially when there are obstacles in the structure.
  • the presence of vertical support columns or pipes may interfere with the disposition of the stabilization strips.
  • Such a stabilizing strip structurally has a high rigidity in their laying plane. It is therefore very difficult to impose a deviation on such bands so as to circumvent any obstacles.
  • Such a stabilizing strip is generally arranged flat, its width and length being substantially in a horizontal plane, thus defining the main plane of such a stabilizing strip
  • An object of the present invention is to provide a stabilizing strip to which it is possible to impose a deflection.
  • the invention thus proposes a stabilization strip intended to be used in reinforced soil structures comprising notches and / or laterally emergent pre-cuts enabling a finite radius of curvature to be imposed on said strip.
  • the term laterally opens a notch or pre-notch whose one end is in the volume of the strip and another end opens on the surface of the strip on its side side.
  • the notches or pre-cuts allow to impose a deviation to the stabilization band while maintaining sufficient rigidity of the band and a sufficient life to ensure the stabilization of the structure in reinforced soil.
  • the invention also relates to the use of a stabilizing strip according to the invention for the construction of a structure in reinforced soil.
  • the invention also relates to a reinforced soil structure comprising at least one stabilizing strip according to the invention.
  • the subject of the invention is also a method for constructing a structure in reinforced soil, in which a facing is placed along a front face of the structure delimiting a volume to be filled, reinforcements are provided in an area of said volume, brings backfill material into said volume and compacts the backfill material, characterized in that said reinforcements comprise at least one stabilizing strip according to the invention.
  • the method of constructing a structure in reinforced soil according to the invention may comprise a step where a radius of curvature of between 1 and 10 meters is imposed on said stabilizing strip, as well as a step in which it is notch said at least one stabilizing strip at the time of laying.
  • the method of construction of a reinforced soil structure according to the invention may further include the provision of the stabilization strips on the same plane and the opening of any pre-notches laterally open at the time of disposition of the stabilization strips .
  • longitudinal means the direction along the longitudinal axis of the strip, the “lateral” direction being a direction substantially perpendicular to the longitudinal direction.
  • Rope means an assembly obtained by twisting or braiding at least three fibers composed of a plurality of threads, for example of at least three threads, of textile, synthetic, plastic, metal or a combination of these different fibers or threads.
  • the chosen cords may for example be thin, with a diameter of the order of one millimeter or more thick with a diameter of about one centimeter.
  • pre-cut designates a portion of the stabilizing strip prepared to be cut in such a manner as to form a laterally open notch.
  • the pre-notch can be opened to obtain the notch laterally open by a small effort, for example by bending the stabilization band or by breaking junction points between the pre-notch and the stabilizing band.
  • the pre-notch may, for example, consist of discontinuous cutting or thinning of material according to the desired notch, or a weak zone capable of tearing or degrading to form a notch.
  • FIG. 1 a perspective view of a first embodiment of a stabilizing strip according to the invention.
  • the stabilizing strip 10 comprises a central portion 12 which extends substantially along the longitudinal axis A of the stabilizing strip 10.
  • the stabilizing strip 10 comprises two lateral parts 14.
  • Each lateral part comprises laterally open slots 16 regularly disposed on the lateral part 14 substantially laterally to the central part 12.
  • the central portion 12 may be of a plastic material such as polyethylene, polypropylene, PVC.
  • the lateral portions 14 comprise a plurality of laterally emergent notches 16 arranged regularly so as to make it possible to impose a radius of curvature over the entire length of the strip 10.
  • the notches in this embodiment have a substantially triangular shape, but they could equally well have a rectangular, curved or irregular shape or a combination of these different shapes.
  • the angle at the apex ⁇ of the triangular notch should not, however, be increased excessively as this may cause a reduction of the material constituting the lateral parts such that a harmful reduction of the friction surface with the ground would result.
  • the angle ⁇ is less than or equal to 90 °, for example less than or equal to 50 °, for example greater than or equal to 20 °, for example greater than or equal to 40 °.
  • said stabilizing strip 10 comprises a central portion 12 extending substantially along the longitudinal axis of said strip.
  • Said central portion 12 comprises a longitudinal reinforcement 18 capable of withstanding traction and being able to admit a radius of curvature in the main plane of the strip.
  • the longitudinal reinforcement is in the form of one or more braided cords 18, but it could also be in the form of one or more twisted cords or polymeric fibers.
  • the longitudinal reinforcement can be included both in the entire volume of the band and not only in the central part.
  • the lateral parts may also include longitudinal reinforcements.
  • the central portion 12 extends laterally on two sides by two lateral portions 14 which project on said central portion 12, in the form of fins.
  • the two lateral parts 14 have a smaller thickness than the central part 12.
  • One or both lateral portions 14 may or may be provided with ribs and / or corrugation and / or perforation or any other means known to those skilled in the art for improving the frictional interaction with the earth.
  • Said lateral portions 14 comprise laterally open slots 16.
  • the notches have a substantially triangular shape, but may also have a rectangular, curved or irregular shape or a combination of these different shapes.
  • the band according to the invention may comprise pre-cuts 17.
  • the stabilizing strip 10 shown on the figure 3 comprises a central portion 12 extending substantially along the longitudinal axis of said strip.
  • Said central portion 12 comprises a polyethylene matrix reinforced with polyester fibers 19 arranged parallel to each other in the volume of said central portion 12.
  • the lateral portions 14 comprise a plurality of laterally open pre-notches 17 arranged regularly so as to make it possible to impose a radius of curvature along the entire length of the strip 10 once these pre-cuts 17 have been opened.
  • the laterally open pre-notches 17 in this embodiment have a substantially triangular shape, but may also have a rectangular, curved or irregular shape or a combination of these different shapes.
  • the apex angle ⁇ of said triangle may be chosen less than or equal to 90 °, for example less than or equal to 50 °, for example greater than or equal to 20 °, for example greater than or equal to 40 °.
  • laterally open pre-notches allows to reduce the surface of the fins only when desired. In fact, it is preferable to have a large contact area between the lateral edges and the earth or the ground in order to increase the friction between the stabilizing strip and the ground and thus strengthen the soil.
  • a strip according to the invention can be produced, for example, by extrusion, coextrusion, rolling or any other technique known to those skilled in the art to produce metal or polymer strips.
  • Notches and / or pre-notches laterally emerging strips of the invention can be obtained by means of manufacturing method as described in WO 95/11351 .
  • Such a method may comprise the passage of the stabilizing strip between two rotary rollers having on their periphery a suitable profile for cutting notches and / or pre-notches laterally open on the strips.
  • the invention also relates to a method of constructing a structure in reinforced soil.
  • FIG 4 illustrates such a method.
  • a compacted backfill 21, in which stabilizing strips 10 according to the invention are distributed, is delimited on the front side of the structure by a facing 23 constituted by juxtaposing prefabricated elements 24, and on the rear side by the ground 25. against which is erected the retaining wall.
  • the compacted embankment 21 shown on the figure 4 comprises a foundation stack 22 of concrete.
  • the stabilizing strips according to the invention can bypass the stack 22 thanks to their notches and / or pre-cuts.
  • the stabilizing strips 10 can be connected to the facing elements 24, and extend for a distance within the embankment 21. These stabilizing strips 10 contribute to reinforce the soil located in a reinforced zone Z on the back of the siding 23.
  • the material of the embankment 21 has a great cohesion thanks to the stabilizing strips 10. It is thus able to withstand the shear stresses which are exerted due to the tensile forces experienced by the stabilizing strips 10 .
  • connection of stabilizing strips on the back of the facing elements 24 ensures the maintenance of the facing applied against embankments that can be of large volume.
  • the stabilizing strips 10 are integrated during the manufacture of the facing elements 24. In the frequent case where the elements 24 are prefabricated in concrete, a portion of the stabilizing strips 10 may be embedded in the molded concrete. 24. In the example of book configuration illustrated by the figure 4 the stabilizing strips 10 are arranged in horizontal planes substantially parallel to one another over the height of the structure.
  • the stabilizing strips may already include notches and / or pre-bowels laterally open, the pre-cuts can be opened, for example hollowed out, by the operator on the site, just before the establishment of bands.
  • the notches can be cut by the operator on the site of the book, or even at the time of installation according to obstacles to bypass.
  • a tool can then make it possible to proceed with the notches in situ, for example cutting pliers or a cutting plier with two series of blades facing one another, each series being arranged according to the desired notch, for example V-shaped .

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Laminated Bodies (AREA)
  • Revetment (AREA)
  • Soil Working Implements (AREA)
  • Cultivation Of Plants (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
EP08166646A 2007-10-16 2008-10-15 Bande de stabilisation destinée à être utilisée dans des ouvrages en sol renforcé Not-in-force EP2050879B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08166646T PL2050879T3 (pl) 2007-10-16 2008-10-15 Taśma stabilizująca przeznaczona do użycia w budowlach na gruncie wzmocnionym

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0707241A FR2922235B1 (fr) 2007-10-16 2007-10-16 Bande de stabilisation destinee a etre utilisee dans des ouvrages en sol renforce

Publications (2)

Publication Number Publication Date
EP2050879A1 EP2050879A1 (fr) 2009-04-22
EP2050879B1 true EP2050879B1 (fr) 2009-12-30

Family

ID=39348956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08166646A Not-in-force EP2050879B1 (fr) 2007-10-16 2008-10-15 Bande de stabilisation destinée à être utilisée dans des ouvrages en sol renforcé

Country Status (10)

Country Link
US (1) US7789590B2 (ja)
EP (1) EP2050879B1 (ja)
JP (1) JP5288986B2 (ja)
AT (1) ATE453760T1 (ja)
DE (1) DE602008000485D1 (ja)
ES (1) ES2337315T3 (ja)
FR (1) FR2922235B1 (ja)
HK (1) HK1128739A1 (ja)
HR (1) HRP20100025T1 (ja)
PL (1) PL2050879T3 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919631B1 (fr) * 2007-07-31 2013-08-09 Terre Armee Int Bande de stabilisation renforcee destinee a etre utilisee dans des ouvrages en sol renforce
US8632278B2 (en) * 2010-06-17 2014-01-21 T & B Structural Systems Llc Mechanically stabilized earth welded wire facing connection system and method
US8632282B2 (en) * 2010-06-17 2014-01-21 T & B Structural Systems Llc Mechanically stabilized earth system and method
US8734059B2 (en) * 2010-06-17 2014-05-27 T&B Structural Systems Llc Soil reinforcing element for a mechanically stabilized earth structure
US8632280B2 (en) * 2010-06-17 2014-01-21 T & B Structural Systems Llc Mechanically stabilized earth welded wire facing connection system and method
FR3016904B1 (fr) * 2014-01-27 2016-02-05 Terre Armee Int Bande de stabilisation renforcee pour ouvrages en remblai renforce avec gaine fonctionnalisee

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1905176A (en) * 1932-06-13 1933-04-25 Edwin F Kieckhefer Method of and means for preparing lawns
FR2325778A1 (fr) * 1975-09-26 1977-04-22 Vidal Henri Armature pour ouvrage en terre armee
GB2014221B (en) * 1977-11-15 1982-04-15 Transport Secretary Of State F Stabilising elements for earth strucutres
JPS5639238A (en) * 1979-09-05 1981-04-14 Tetsushi Okudaira Banking slope protection system
GB8517152D0 (en) * 1985-07-05 1985-08-14 Vidal H Metal strip
US4834584A (en) * 1987-11-06 1989-05-30 Hilfiker William K Dual swiggle reinforcement system
GB8800309D0 (en) * 1988-01-07 1988-02-10 Vidal H Earth stabilisation
IT1237841B (it) * 1989-11-24 1993-06-18 Giuseppe Sala Armatura di rinforzo del terreno resistente alla corrosione
AU683311B2 (en) * 1993-10-22 1997-11-06 Terre Armee Internationale Strip for use in stabilised earth structures
JPH1046583A (ja) * 1996-04-30 1998-02-17 Fujita Corp 壁面を有する盛土の補強工法
US6050746A (en) * 1997-12-03 2000-04-18 Michael W. Wilson Underground reinforced soil/metal structures
US7270502B2 (en) * 2005-01-19 2007-09-18 Richard Brown Stabilized earth structure reinforcing elements
KR100615472B1 (ko) * 2006-01-24 2006-08-25 이정수 보강토 옹벽 지지용 띠형 섬유보강재 및 이의 시공방법

Also Published As

Publication number Publication date
US7789590B2 (en) 2010-09-07
FR2922235B1 (fr) 2009-12-18
JP5288986B2 (ja) 2013-09-11
ES2337315T3 (es) 2010-04-22
EP2050879A1 (fr) 2009-04-22
HK1128739A1 (en) 2009-11-06
ATE453760T1 (de) 2010-01-15
JP2009097333A (ja) 2009-05-07
DE602008000485D1 (de) 2010-02-11
HRP20100025T1 (hr) 2010-02-28
PL2050879T3 (pl) 2010-05-31
US20090123238A1 (en) 2009-05-14
FR2922235A1 (fr) 2009-04-17

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