EP2118384A1 - Ground reinforced structure and reinforcement members for the construction thereof - Google Patents

Ground reinforced structure and reinforcement members for the construction thereof

Info

Publication number
EP2118384A1
EP2118384A1 EP08775656A EP08775656A EP2118384A1 EP 2118384 A1 EP2118384 A1 EP 2118384A1 EP 08775656 A EP08775656 A EP 08775656A EP 08775656 A EP08775656 A EP 08775656A EP 2118384 A1 EP2118384 A1 EP 2118384A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing
reinforcement
strips
path
segments
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.)
Granted
Application number
EP08775656A
Other languages
German (de)
French (fr)
Other versions
EP2118384B1 (en
Inventor
Nicolas Freitag
Jean-Claude Morizot
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
Publication of EP2118384A1 publication Critical patent/EP2118384A1/en
Application granted granted Critical
Publication of EP2118384B1 publication Critical patent/EP2118384B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • E02D17/18—Making embankments, e.g. dikes, dams
    • 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
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to the construction of structures in reinforced soil or reinforced earth. This construction technique is commonly used to make structures such as retaining walls, bridge abutments, etc.
  • a reinforced soil structure combines compacted backfill, siding and reinforcement usually connected to the facing. Reinforcements are placed in the soil with a density depending on the constraints that can be exerted on the structure, the thrust forces of the ground being taken up by the friction soil-reinforcements.
  • the invention is more particularly concerned with the case where the reinforcements are in the form of strips of synthetic material, for example based on polyester fibers.
  • 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. There can be horizontal recesses on this front face between different levels of the facing, when the structure has one or more terraces.
  • Reinforcements placed in the embankment are usually joined to the facing by means of mechanical connection members that can take various forms. Once the work is completed, reinforcements distributed in the embankment transmit high loads, up to several tons. Their connection to the facing must be robust to maintain the cohesion of the whole.
  • connection members present risks of degradation. They are often susceptible to corrosion due to moisture or chemicals present or infiltrated into the backfill.
  • the connecting members are sometimes made of resins or composite materials to be less easily corrodable. But their cost is then increased, and it is difficult to give them good mechanical properties. It is thus desirable to be able to dispense with connection members between the facing element and the reinforcements of the structure.
  • the facing elements are shaped to have at least one passageway for receiving a reinforcing strip.
  • a reinforced soil structure comprising a backfill, reinforcement strips extending in a reinforced area of the embankment situated at the rear of a front face of the structure, and a facing placed along of said front face, the reinforcing strips being anchored to the facing in respective anchoring regions.
  • the cladding incorporates a path formed for a reinforcement strip between two emergence points located on a rear face of the facing adjacent to the embankment. This path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged to position the strip in the same emergence plane perpendicular to said rear face, two curved portions respectively extending the two rectilinear portions and arranged to deflect the strip off. the emergence plane, and a connecting portion interconnecting the two curved portions and having at least one loop located outside the emergence plane.
  • This arrangement allows a good positioning and effective anchoring of the reinforcing strip while avoiding making it follow too strong curvatures or to apply to it great efforts of embrace (tightening).
  • the distribution of reinforcement bands is generally calculated as a function of the thrust forces of the ground and the number of reinforcement bands required for a given configuration is determined as a function of the soil-reinforcement friction.
  • the object of the present invention is to provide a configuration of reinforcing strips for advantageous anchoring to a facing of a structure in reinforced soil and to address the above concerns.
  • the invention thus proposes a structure in reinforced soil, comprising a backfill, reinforcement strips comprising reinforcing segments which extend in a reinforced area of the embankment located at the rear of a front face of the structure, and a facing placed along said front face, the reinforcing strips being anchored to the facing in respective anchoring regions, wherein the facing incorporates, in at least one anchoring region, a path formed for a reinforcement strip between two emergence points located on a rear face of the facing adjacent to the embankment, and wherein the path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged to position the band in the same plane of emergence (P) perpendicular to said rear face, two curved portions respectively extending the two rectilinear portions and arranged to deflect the strip out of the emergence plane (P), and one connecting connection between the two curved portions and having at least one loop located outside the emergence plane, where at least two reinforcing segments each extend a straight portion of a path beyond a point of
  • the connecting elements are strips. These binding strips may be attached to the reinforcement strips by stapling, gluing or any other suitable technique. This attachment can be performed before or after positioning the reinforcement strips along said path.
  • the connecting elements are arranged at an angle ⁇ , between 30 ° and 150 ° preferably between 60 ° and 120 °, or even substantially equal to 90 °, where the angle ⁇ measures the angular difference in the plane P between the axis of one of the reinforcing segments and the axis of the connecting element.
  • the angle ⁇ measures the angular difference in the plane P between the axis of one of the reinforcing segments and the axis of the connecting element.
  • the facing is made from panel-shaped elements, and in which the rectilinear portions of said path each extend in the emergence plane (P) over at least half the thickness of a panel facing element;
  • the reinforcing strip has a width at most equal to half the thickness of the facing
  • the facing has, in the anchoring region, a protective sheath receiving the reinforcing strip along said path.
  • two reinforcing segments interconnected by at least one connecting element are part of the same reinforcement strip disposed along said path.
  • the reinforcement segments of the same band are both interconnected by a part of this band that follows said path and by at least one connecting element.
  • the structure may comprise a plurality of reinforcing strips that are independent of each other and arranged along said path where each reinforcing strip comprises two reinforcing segments interconnected by a plurality of connecting elements.
  • At least two reinforcing segments interconnected by at least one connecting element form part of two distinct reinforcement strips, each being arranged along said path.
  • reinforcement segments of several separate connecting strips are interconnected by the same reinforcing element.
  • said distinct reinforcement strips each comprise first and second reinforcement segments where the first and / or second reinforcement segments are interconnected by connecting elements.
  • the invention also relates to a reinforcement element intended to reinforce a structure comprising a backfill, comprising at least two reinforcing strips with reinforcing segments substantially parallel to each other, where the reinforcing segments of two different reinforcement strips are interconnected. by at least one connecting element and the reinforcing strips are twisted by half a turn between two connecting elements.
  • a reinforcing element may be placed in the cladding to make a structure where the reinforcing segments of several separate connecting strips are interconnected by the same reinforcing element.
  • said reinforcing element may have the following characteristics, alone or in combination: the connecting elements are arranged substantially symmetrically with respect to an axis passing through the middle of the reinforcing strips connected to one another; the reinforcing strips are twisted by a half-turn in a first direction and a half-turn in an opposite direction between two connecting elements;
  • the connecting elements are strips.
  • the invention also relates to a method of manufacturing a reinforcement element for reinforcing a structure comprising a backfill comprising the following successive steps:
  • At least two reinforcing strips are arranged in substantially parallel manner, the reinforcement strips being connected by a plurality of connecting elements,
  • the reinforcement strips are twisted by half a turn before arranging at least one connecting element on each side of the twisted part.
  • the invention also relates to a method of manufacturing a reinforced soil structure comprising a backfill, reinforcement strips comprising reinforcing segments which extend in a reinforced area of the embankment located at the rear of a front face of the structure, and a facing placed along said front face, the reinforcing strips being anchored to the facing in respective anchoring regions comprising the following steps: implementing the method and / or supplying reinforcement elements ,
  • a path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged in the same plane of emergence (P) perpendicular to said face rear, two curved portions respectively extending the two rectilinear portions and disposed out of the emergence plane (P), and a connecting portion interconnecting the two curved portions and having at least one loop located outside the emergence plane.
  • the strip can be set up according to the path as soon as the prefabricated elements are molded with or without a protective sheath.
  • a sleeve insulates the strip from the molded material to protect the reinforcement against premature damage.
  • the reinforcement is provided by polyester fibers, it is known that these poorly admit basic environments such as those found in concrete.
  • the aforementioned sleeve then completes the protection provided by the plastic sheath which coats the polyester fibers of the strip.
  • the reinforcement strips are introduced after the molding and the connection of the reinforcing segments with a connecting element is carried out after introduction of the reinforcing strips in the prefabricated elements.
  • the reinforcement strips can be introduced either after or before the molding. It is generally advantageous to perform it before molding and it is possible to mold the prefabricated elements with reinforcement strips that can be bonded by a connecting element either before or after molding. The incorporation at the time of molding reinforcement strips previously bonded together by connecting elements may be advantageous because it allows to separate the steps of implementation of the process and to prepare the reinforcement strips bonded together independently of the molding step. This can result in significant productivity gains.
  • the two curved portions of the path direct the band towards the same side of the emergence plane.
  • a first possibility is that the path is formed so that the band is received in the two straight portions with a same face of the band oriented towards this side of the emergence plane. The path is then formed so that said face of the strip is placed either on the outer side or on the inner side of the loop located outside the emergence plane.
  • a second possibility is that the path is formed so that the strip is received in one of the two rectilinear portions with one face of the strip facing said side of the emergence plane and in the other of the two rectilinear portions with said face of the strip facing away from said side of the emergence plane.
  • the two curved portions of the path respectively direct the strip towards two opposite sides of the emergence plane
  • the connecting portion of the path has two loops respectively extending the two curved portions of the path and a portion crossing the plane of the plane. emergence and linking together the two loops.
  • FIG. 1 is a schematic side sectional view of a structure in soil reinforced according to the invention during construction
  • Figure 2 is a sectional view of a facing element comprising a reinforcing element according to the invention
  • FIG. 3 shows a perspective view of a path that a reinforcing strip may follow in a facing element for a configuration according to the invention, in which a plurality of connecting elements connect together reinforcing segments of a same reinforcing band
  • FIGS. 9 and 10 show reinforcing elements used in the context of the invention.
  • the dimensions of the various elements shown in these figures are not in proportion to their actual dimensions. In all the figures, identical references correspond to identical elements.
  • the term "reinforcing strip” 2 means a continuous strip.
  • Such a strip may comprise one or more reinforcing segments 82, 83, 84 extending into a reinforced area of the backfill 1.
  • a reinforcing strip comprises two reinforcing segments.
  • Figure 1 illustrates the application of the invention to the construction of a retaining wall reinforced soil.
  • a compacted embankment 1, in which reinforcements 2 are distributed, is delimited on the front side of the structure by a facing 3 constituted by juxtaposing prefabricated elements 4 in the form of panels, and on the rear side by the ground 5 against which is erected the retaining wall.
  • Reinforcements 2 consist of synthetic reinforcements in the form of flexible strips extending in horizontal planes behind the facing 3. It may in particular be reinforcing strips based on polyethylene fibers wrapped in polyethylene.
  • the reinforcing strips 2 are attached to the prefabricated elements 4 assembled to form the facing 3.
  • These elements 4 are typically made of reinforced concrete. In the example shown, they are in the form of panels. They could also have other forms, including block.
  • one or more reinforcement strips 2 are installed in the mold along a path described below in order to perform the strip-element anchoring. After taking the concrete, each band has two sections that leave the element to be installed in the embankment.
  • reinforcement strips 2 already installed in the lower levels are stretched.
  • the two sections of a strip 2 are in the same plane emergence P (perpendicular to the plane of Figure 2).
  • the elements 4 are oriented so that the emergence plane is horizontal.
  • Figure 2 shows a facing element used in some embodiments of the invention.
  • this element 4 is made of molded concrete.
  • a reinforcing strip 2 is placed in the mold when casting the concrete and maintained until the setting of the concrete. Its guidance can be achieved using the reinforcing bars of the concrete (not shown), possibly supplemented by rods or deflection members attached to these bars, so that the band follows the desired path in the anchoring zone. This path is defined inside the element 4 between the two points 6 of emergence of the two sections of the strip on the rear face 7 of the element (face adjacent to the backfill).
  • FIG. 3 A path 20 corresponding to a case where a plurality of connecting strips connect together reinforcing segments of the same reinforcing strip, is illustrated in FIG. 3. It has two rectilinear portions 81 extending perpendicularly to the rear face. 7 in each straight portion 81, the strip remains in its emergence plane P.
  • the rectilinear portions 81 extend over at least half the thickness of the body of the body. the element 4, measured perpendicularly to its rear face 7. This avoids bad stressing of the concrete in the vicinity of the rear face 7.
  • Each rectilinear portion 81 of the path of the strip is extended by a respective curved portion 9 where the strip is deflected out of the emergence plane P. Beyond this curved portion 9, the strip 2 extends along the face before the element, a little behind this front so as not to be visible on the surface of the book.
  • the two curved portions 9 are interconnected by a connecting portion which has a loop 10 located outside the emergence plane P.
  • the strip is directed towards the same side P1 of the emergence plane P in the two curved portions 9 of its path within the facing element 4.
  • This path is formed so that (i) two rectilinear portions 8, the strip has the same face oriented towards the side P1 of the emergence plane, and (ii) that this face of the strip is placed on the outer side of the loop 10. Consequently, in the middle of the Loop 10, the band is placed substantially perpendicularly to the rear face 7 of the element.
  • Two reinforcing segments 82 each extend a rectilinear portion 81 of said path, beyond an emergence point 6.
  • a rectilinear portion 81 extended by a reinforcing segment 82 constitutes a rectilinear portion 8 of a reinforcing strip 2.
  • two straight portions 8 of the same reinforcing strip are arranged substantially parallel.
  • the two reinforcing segments 82 are interconnected by a plurality of connecting elements 11, constituted in the illustrated example of a strip of the same nature as the reinforcing strip 2. These binding strips 11 can be stapled, glued or connected. by any other means to the reinforcing segments 82 in an area 111.
  • the connecting elements 11 are arranged at an angle ⁇ substantially equal to 90 °, where the angle ⁇ measures the angular difference in the plane P between the axis 80 of a reinforcing segment 82 and the axis 110 of a connecting element 11.
  • Figures 4 to 8 illustrate various embodiments where reinforcing strips 2 follow a path 20 and where a plurality of connecting elements 12, 13 connect together reinforcing segments 84, 83 of several separate reinforcing strips 2.
  • the reinforcing strips 2 comprise a first 84 and a second 83 reinforcement segments.
  • the first reinforcing segments 84 of several reinforcing strips 2 are interconnected by a plurality of connecting elements 12 and the second reinforcing segments 83 of the same reinforcing strips 2 are interconnected by a plurality of connecting elements. 13.
  • the connecting elements 12 and 13 are arranged at an angle ⁇ substantially equal to 90 °, where the angle ⁇ measures the angular difference in the plane P between the axis 80 of a reinforcing segment, for example 84 and the axis, for example 120 of a connecting element 12 .
  • the connecting elements 13 which interconnect the second reinforcing segments 83 are arranged below the first reinforcing segments 84. These connecting elements 13 are connected, in particular by stapling or gluing, from above. the second reinforcing segments 83 in zones 131 and pass under the first reinforcing segments 84 in zones 132.
  • the connecting elements 12 which interconnect the first reinforcing segments 84 are connected, in particular by stapling or gluing, to the underside of the first reinforcing segments 84 in zones 121. These connecting elements 12 are arranged above the second reinforcing segments 83 in zones 122.
  • FIG. 4 shows an embodiment where the path 20 is similar to that shown in FIG. 3 to the description of which reference can be made and where a loop 10 is part of the path 20.
  • the loop 101 of the path 20 is oriented in the opposite direction, that is to say that the face of the band oriented towards the side P1 of the emergence plane is placed on the inside of the loop 101.
  • the strip follows one of the two rectilinear portions 81 of its path 20 with one of its two faces oriented towards the side P1 of the emergence plane P and the other of the two rectilinear portions.
  • the strip is twisted twice by half a turn, in a first and a second direction to form the loop 103 of the path 20.
  • the upper face of the strip on the side of the first segment of reinforcement 84 is then the same as that on the side of the second segment of reinforcement 83 of the same band 2.
  • FIG. 8 shows an example in which the connecting portion interconnecting the two curved portions 9 comprises two loops 104 on either side of the plane P.
  • the two curved portions 9 of the path respectively direct the band to the two opposite sides P1, P2 of emergence plane P.
  • the connecting portion has a portion 21 which passes through the plane P and interconnects the two loops 104.
  • loops 101, 102, 103, 104 shown respectively in Figures 5 to 8 can substitute for the loop 10 shown in Figure 3 to achieve alternative embodiments of the invention to that shown.
  • the width of the reinforcing strip 2 is less than or equal to at least half the thickness of the facing element.
  • This thickness is typically between 14 and 16 cm. It will then be possible to use strips approximately 45 mm wide.
  • FIGS 9 and 10 show reinforcing elements used in the context of the invention, where three reinforcing strips 2 are arranged in parallel. Each of these strips comprises reinforcing segments 83a, 84a disposed on one side and the other of an axis passing in the middle of the strips 2. These reinforcing elements 83a, 84a are interconnected by a plurality of elements 13a, 12a, here represented as part of strips of the same nature as the strips 2.
  • FIG. 9 represents a case where the faces of the strips 3 have a constant orientation all along their length.
  • a reinforcing element may for example be manufactured by laying the strips flat and stapling the connecting elements 12a, 13a to the reinforcing segments, respectively 84a, 83a.
  • Such a reinforcing element is particularly advantageous because it can be folded, according to the direction of the arrow shown, the portion comprising the reinforcing segments 84a and the connecting members 12a over the portion comprising the reinforcing segments 83a and the connecting members 13a.
  • a loop is then obtained in the central zone of the reinforcing element between each pair of reinforcement segments 83a, 84a.
  • the reinforcing element can then be placed in a mold and a prefabricated element can be produced after molding, in particular with concrete. After disposal in a backfill to be reinforced, the configuration shown in FIG. 6, where loops 102 are formed, is obtained.
  • the reinforcing segments 83a and 84a of the reinforcing element thus become the reinforcing segments 83 and 84 shown in FIG. 6, the connecting elements of the reinforcing element 12a, 13a thus becoming the connecting elements 12, 13.
  • Figure 10 shows a case where the faces of the reinforcing strips have a change of orientation.
  • a reinforcing element may for example be manufactured by laying the reinforcing strips 2 flat and twisting them by a half-turn in the region 800, located for example substantially in the middle of the reinforcing strips 2.
  • the loops which are thus formed are of the type of the loops 103 represented in FIG. 7.
  • the reinforcement element shown in FIG. 10 can be used to obtain the configuration shown in FIG.
  • the proposed reinforcement method using a siding of a reinforced soil structure and reinforcing strips, is compatible with a large number of work configurations, band lengths, densities of installation of bands, etc.

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  • 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)
  • Environmental & Geological Engineering (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention relates to a ground reinforced structure that comprises a fill (1), reinforcement strips (2) including reinforcement sections (82, 83, 84) extending in a reinforced area of the fill behind the front face of the structure, and a cladding (3) provided along said front face, the reinforcement strips (2) being anchored to the cladding (3) in respective anchoring regions, wherein the cladding (3) comprises, in at least one anchoring region, a path (20) defined for a reinforcement strip (2) between two protruding points (6) located on a rear face of the cladding (7) adjacent to the fill (1), the path (20) including at least two rectilinear portions (81) respectively adjacent to the two protruding points (6) and each provided for positioning the strip (2) in the same protruding plane (P) perpendicular to said rear face (7), two curved portions (9) respectively defining an extension of the two rectilinear portions (81) and provided for diverting the strip outside from the protruding plane (P), and a connection portion for connecting the two curved portions (9) together and having at least one loop (10, 101, 102, 103, 104) provided outside the protruding plane, and wherein at least two reinforcement sections (82, 83, 84) each define an extension of a rectilinear portion (81) of a path (20) beyond the protruding point (6) and are connected together by at least one linking member (11, 12, 13), each of said reinforcement sections (82, 83, 84) being part of a reinforcement strip (2) provided along said path (20). The invention also relates to reinforcement members and to associated methods.

Description

OUVRAGE EN SOL RENFORCE ET ELEMENTS DE RENFORT POUR SA CONSTRUCTION REINFORCED GROUND WORK AND REINFORCING ELEMENTS FOR ITS CONSTRUCTION
La présente invention concerne la construction d'ouvrages en sol renforcé ou terre armée. Cette technique de construction est couramment utilisée pour réaliser des ouvrages tels que des murs de soutènement, des culées de ponts, etc.The present invention relates to the construction of structures in reinforced soil or reinforced earth. This construction technique is commonly used to make structures such as retaining walls, bridge abutments, etc.
Un ouvrage en sol renforcé associe un remblai compacté, un parement et des renforcements habituellement connectés au parement. Les renforcements sont mis en place dans le sol avec une densité dépendant des contraintes pouvant s'exercer sur l'ouvrage, les efforts de poussée du terrain étant repris par le frottement sol-renforcements.A reinforced soil structure combines compacted backfill, siding and reinforcement usually connected to the facing. Reinforcements are placed in the soil with a density depending on the constraints that can be exerted on the structure, the thrust forces of the ground being taken up by the friction soil-reinforcements.
L'invention s'intéresse plus particulièrement au cas où les renforcements sont en forme de bande en matériau synthétique, par exemple à base de fibres de polyester.The invention is more particularly concerned with the case where the reinforcements are in the form of strips of synthetic material, for example based on polyester fibers.
Le parement est le plus souvent réalisé à partir d'éléments préfabriqués en béton, en forme de dalles ou de blocs, juxtaposés pour recouvrir la face frontale de l'ouvrage. Il peut y avoir des décrochements horizontaux sur cette face frontale entre différents niveaux du parement, lorsque l'ouvrage comporte une ou plusieurs terrasses.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. There can be horizontal recesses on this front face between different levels of the facing, when the structure has one or more terraces.
Les renforcements placés dans le remblai sont habituellement solidarisés au parement à l'aide d'organes de connexion mécanique pouvant prendre diverses formes. Une fois l'ouvrage terminé, les renforcements répartis dans le remblai transmettent des charges élevées, pouvant aller jusqu'à plusieurs tonnes. Leur connexion au parement doit être robuste pour conserver la cohésion de l'ensemble.Reinforcements placed in the embankment are usually joined to the facing by means of mechanical connection members that can take various forms. Once the work is completed, reinforcements distributed in the embankment transmit high loads, up to several tons. Their connection to the facing must be robust to maintain the cohesion of the whole.
Les organes de connexion présentent des risques de dégradation. Ils sont souvent sensibles à la corrosion due à l'humidité ou à des agents chimiques présents ou infiltrés dans le remblai. Les organes de connexion sont parfois réalisés à base de résines ou de matériaux composites pour être moins facilement corrodables. Mais leur coût est alors augmenté, et il est difficile de leur conférer de bonnes propriétés mécaniques. Il est ainsi souhaitable de pouvoir se dispenser d'organes de connexion entre l'élément de parement et les renforcements de l'ouvrage.The connecting members present risks of degradation. They are often susceptible to corrosion due to moisture or chemicals present or infiltrated into the backfill. The connecting members are sometimes made of resins or composite materials to be less easily corrodable. But their cost is then increased, and it is difficult to give them good mechanical properties. It is thus desirable to be able to dispense with connection members between the facing element and the reinforcements of the structure.
Dans certains systèmes, les éléments de parement sont conformés de façon à présenter au moins un passage destiné à recevoir une bande de renforcement.In some systems, the facing elements are shaped to have at least one passageway for receiving a reinforcing strip.
Dans FR 2878268, on propose un ouvrage en sol renforcé, comprenant un remblai, des bandes de renforcement s'étendant dans une zone renforcée du remblai située à l'arrière d'une face frontale de l'ouvrage, et un parement placé le long de ladite face frontale, les bandes de renforcement étant ancrées au parement dans des régions d'ancrage respectives. Dans au moins une région d'ancrage, le parement incorpore un trajet formé pour une bande de renforcement entre deux points d'émergence situés sur une face arrière du parement adjacente au remblai. Ce trajet comporte deux portions rectilignes respectivement adjacentes aux deux points d'émergence et chacune disposée pour positionner la bande dans un même plan d'émergence perpendiculaire à ladite face arrière, deux portions courbes prolongeant respectivement les deux portions rectilignes et disposées pour dévier la bande hors du plan d'émergence, et une portion de raccordement reliant entre elles les deux portions courbes et présentant au moins une boucle située en dehors du plan d'émergence.In FR 2878268, a reinforced soil structure is proposed, comprising a backfill, reinforcement strips extending in a reinforced area of the embankment situated at the rear of a front face of the structure, and a facing placed along of said front face, the reinforcing strips being anchored to the facing in respective anchoring regions. In at least one anchoring region, the cladding incorporates a path formed for a reinforcement strip between two emergence points located on a rear face of the facing adjacent to the embankment. This path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged to position the strip in the same emergence plane perpendicular to said rear face, two curved portions respectively extending the two rectilinear portions and arranged to deflect the strip off. the emergence plane, and a connecting portion interconnecting the two curved portions and having at least one loop located outside the emergence plane.
Cette disposition permet un bon positionnement et un ancrage efficace de la bande de renforcement tout en évitant de lui faire suivre des courbures trop fortes ou de lui appliquer de grands efforts d'étreinte (serrement).This arrangement allows a good positioning and effective anchoring of the reinforcing strip while avoiding making it follow too strong curvatures or to apply to it great efforts of embrace (tightening).
On calcule en général la répartition des bandes de renforcement en fonction des efforts de poussée du terrain et on détermine le nombre de bandes de renfort nécessaire à une configuration donnée en fonction du frottement sol - renforcements.The distribution of reinforcement bands is generally calculated as a function of the thrust forces of the ground and the number of reinforcement bands required for a given configuration is determined as a function of the soil-reinforcement friction.
En vue de répondre à une préoccupation constante d'augmentation de la résistance des ouvrages et/ou de réduction des coûts - en diminuant le nombre de bandes de renfort nécessaire pour une même configuration - il est avantageux de pouvoir augmenter le coefficient de frottement sol - renforcements.In order to respond to a constant concern to increase the strength of structures and / or reduce costs - by reducing the number of reinforcing strips necessary for the same configuration - it is advantageous to be able to increase the coefficient of friction soil - reinforcements.
Le but de ia présente invention est de proposer une configuration de bandes de renforcement permettant un ancrage avantageux à un parement d'un ouvrage en sol renforcé et de répondre aux préoccupations ci-dessus.The object of the present invention is to provide a configuration of reinforcing strips for advantageous anchoring to a facing of a structure in reinforced soil and to address the above concerns.
L'invention propose ainsi un ouvrage en sol renforcé, comprenant un remblai, des bandes de renforcement comprenant des segments de renfort qui s'étendent dans une zone renforcée du remblai située à l'arrière d'une face frontale de l'ouvrage, et un parement placé le long de ladite face frontale, les bandes de renforcement étant ancrées au parement dans des régions d'ancrage respectives, dans lequel le parement incorpore, dans au moins une région d'ancrage, un trajet formé pour une bande de renforcement entre deux points d'émergence situés sur une face arrière du parement adjacente au remblai, et où le trajet comporte deux portions rectilignes respectivement adjacentes aux deux points d'émergence et chacune disposée pour positionner la bande dans un même plan d'émergence (P) perpendiculaire à ladite face arrière, deux portions courbes prolongeant respectivement les deux portions rectilignes et disposées pour dévier la bande hors du plan d'émergence (P), et une portion de raccordement reliant entre elles les deux portions courbes et présentant au moins une boucle située en dehors du plan d'émergence, où au moins deux segments de renfort prolongent chacun une portion rectiligne d'un trajet au-delà d'un point d'émergence et sont reliés entre eux par au moins un élément de liaison et où chacun desdits segments de renfort fait partie d'une bande de renforcement disposée selon ledit trajet.The invention thus proposes a structure in reinforced soil, comprising a backfill, reinforcement strips comprising reinforcing segments which extend in a reinforced area of the embankment located at the rear of a front face of the structure, and a facing placed along said front face, the reinforcing strips being anchored to the facing in respective anchoring regions, wherein the facing incorporates, in at least one anchoring region, a path formed for a reinforcement strip between two emergence points located on a rear face of the facing adjacent to the embankment, and wherein the path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged to position the band in the same plane of emergence (P) perpendicular to said rear face, two curved portions respectively extending the two rectilinear portions and arranged to deflect the strip out of the emergence plane (P), and one connecting connection between the two curved portions and having at least one loop located outside the emergence plane, where at least two reinforcing segments each extend a straight portion of a path beyond a point of emergence and are interconnected by at least one connecting element and wherein each of said reinforcing segments is part of a reinforcing strip disposed along said path.
Le fait de relier entre eux au moins deux segments de renfort faisant partie d'une bande de renforcement disposée selon ledit trajet par au moins un élément de liaison permet d'augmenter significativement le coefficient de frottement sol - renforcements.The fact of connecting together at least two reinforcing segments forming part of a reinforcing strip disposed along said path by at least one connecting element makes it possible to significantly increase the coefficient of friction of soil - reinforcements.
On peut alors avantageusement réduire le nombre de bandes de renforcement nécessaires pour renforcer un ouvrage, à configuration donnée ou augmenter la marge de sécurité pour une même répartition de bandes de renforcement.We can then advantageously reduce the number of reinforcing strips needed to reinforce a structure, given configuration or increase the margin of safety for the same distribution of reinforcement bands.
Selon un mode de réalisation, les éléments de liaison sont des bandes. Ces bandes de liaison peuvent être fixées aux bandes de renforcement par agrafage, collage ou toute autre technique appropriée. Cette fixation peut être effectuée avant ou après positionnement des bandes de renforcement selon ledit trajet.According to one embodiment, the connecting elements are strips. These binding strips may be attached to the reinforcement strips by stapling, gluing or any other suitable technique. This attachment can be performed before or after positioning the reinforcement strips along said path.
Selon un mode de réalisation, les éléments de liaison sont disposés selon un angle α, compris entre 30° et 150° de préférence entre 60° et 120°, voire sensiblement égal à 90°, où l'angle α mesure l'écart angulaire dans le plan P entre l'axe d'un des segments de renfort et l'axe de l'élément de liaison. On peut, selon l'invention, disposer les segments de renfort pour que ceux-ci soient sensiblement parallèles entre eux.According to one embodiment, the connecting elements are arranged at an angle α, between 30 ° and 150 ° preferably between 60 ° and 120 °, or even substantially equal to 90 °, where the angle α measures the angular difference in the plane P between the axis of one of the reinforcing segments and the axis of the connecting element. According to the invention, it is possible to arrange the reinforcing segments so that they are substantially parallel to one another.
Selon différents modes de réalisation, qui peuvent être combinés : - le parement est réalisé à partir d'éléments en forme de panneaux, et dans lequel les portions rectilignes dudit trajet s'étendent chacune dans le plan d'émergence (P) sur au moins la moitié de l'épaisseur d'un élément de parement en forme de panneaux ;According to different embodiments, which can be combined: the facing is made from panel-shaped elements, and in which the rectilinear portions of said path each extend in the emergence plane (P) over at least half the thickness of a panel facing element;
- la bande de renforcement a une largeur au plus égale à la moitié de l'épaisseur du parement ;the reinforcing strip has a width at most equal to half the thickness of the facing;
- le parement présente, dans la région d'ancrage, un fourreau de protection recevant la bande de renforcement le long dudit trajet.- The facing has, in the anchoring region, a protective sheath receiving the reinforcing strip along said path.
Selon un mode de réalisation, deux segments de renfort reliés entre eux par au moins un élément de liaison font partie d'une même bande de renforcement disposée selon ledit trajet. Dans cette configuration, les segments de renfort d'une même bande sont à la fois liés entre eux par une partie de cette bande qui suit ledit trajet et par au moins un élément de liaison.According to one embodiment, two reinforcing segments interconnected by at least one connecting element are part of the same reinforcement strip disposed along said path. In this configuration, the reinforcement segments of the same band are both interconnected by a part of this band that follows said path and by at least one connecting element.
Il est envisageable que plusieurs segments de renfort de plusieurs bandes soient également reliés entre eux par un même élément de renfort. Selon le précédent mode de réalisation, l'ouvrage peut comprendre une pluralité de bandes de renforcement indépendantes entre elles et disposées selon ledit trajet où chaque bande de renforcement comprend deux segments de renfort reliés entre eux par une pluralité d'éléments de liaison.It is conceivable that several reinforcing segments of several bands are also interconnected by the same reinforcement element. According to the previous embodiment, the structure may comprise a plurality of reinforcing strips that are independent of each other and arranged along said path where each reinforcing strip comprises two reinforcing segments interconnected by a plurality of connecting elements.
Selon un autre mode de réalisation, au moins deux segments de renfort reliés entre eux par au moins un élément de liaison font partie de deux bandes de renforcement distinctes, chacune étant disposée selon ledit trajet. Dans cette configuration des segments de renfort de plusieurs bandes de liaison distinctes sont reliés entre eux par un même élément de renfort.According to another embodiment, at least two reinforcing segments interconnected by at least one connecting element form part of two distinct reinforcement strips, each being arranged along said path. In this configuration reinforcement segments of several separate connecting strips are interconnected by the same reinforcing element.
Selon le précédent mode de réalisation, lesdites bandes de renforcement distinctes comprennent chacune des premier et deuxième segments de renfort où les premier et/ou les deuxième segments de renfort sont liés entre eux par des éléments de liaison.According to the previous embodiment, said distinct reinforcement strips each comprise first and second reinforcement segments where the first and / or second reinforcement segments are interconnected by connecting elements.
L'invention vise également un élément de renfort destiné à renforcer un ouvrage comprenant un remblai, comprenant au moins deux bandes de renforcement avec des segments de renfort sensiblement parallèles entre eux, où les segments de renfort de deux bandes de renforcement différentes sont reliés entre eux par au moins un élément de liaison et les bandes de renforcement sont vrillées d'un demi-tour entre deux éléments de liaison. Un tel élément de renfort est susceptible d'être disposé dans le parement pour réaliser un ouvrage où les segments de renfort de plusieurs bandes de liaison distinctes sont reliés entre eux par un même élément de renfort.The invention also relates to a reinforcement element intended to reinforce a structure comprising a backfill, comprising at least two reinforcing strips with reinforcing segments substantially parallel to each other, where the reinforcing segments of two different reinforcement strips are interconnected. by at least one connecting element and the reinforcing strips are twisted by half a turn between two connecting elements. Such a reinforcing element may be placed in the cladding to make a structure where the reinforcing segments of several separate connecting strips are interconnected by the same reinforcing element.
Selon l'invention, ledit élément de renfort peut présenter les caractéristiques suivantes, seules ou en combinaison : - les éléments de liaison sont disposés sensiblement symétriquement par rapport à un axe passant par le milieu des bandes de renforcement reliées entre elles ; - les bandes de renforcement sont vrillées d'un demi-tour dans un premier sens et d'un demi-tour dans un sens opposé entre deux éléments de liaison ;According to the invention, said reinforcing element may have the following characteristics, alone or in combination: the connecting elements are arranged substantially symmetrically with respect to an axis passing through the middle of the reinforcing strips connected to one another; the reinforcing strips are twisted by a half-turn in a first direction and a half-turn in an opposite direction between two connecting elements;
- les éléments de liaison sont des bandes.the connecting elements are strips.
L'invention porte également sur un procédé de fabrication d'un élément de renfort destiné à renforcer un ouvrage comprenant un remblai comprenant les étapes successives suivantes :The invention also relates to a method of manufacturing a reinforcement element for reinforcing a structure comprising a backfill comprising the following successive steps:
- disposer au moins deux bandes de renforcement de manière sensiblement parallèle, - relier les bandes de renforcement par une pluralité d'éléments de liaison,at least two reinforcing strips are arranged in substantially parallel manner, the reinforcement strips being connected by a plurality of connecting elements,
- rabattre les bandes de renforcement sur elles mêmes de manière à former une boucle entre deux éléments de liaison.- Fold the reinforcement strips on themselves to form a loop between two connecting elements.
On peut ainsi réaliser un élément de renfort ci-dessus. Selon un mode de réalisation dudit procédé, on vrille les bandes de renforcement d'un demi tour avant de disposer au moins un élément de liaison de chaque côté de la partie vrillée.It is thus possible to make a reinforcing element above. According to one embodiment of said method, the reinforcement strips are twisted by half a turn before arranging at least one connecting element on each side of the twisted part.
L'invention concerne également un procédé de fabrication d'un ouvrage en sol renforcé comprenant un remblai, des bandes de renforcement comprenant des segments de renfort qui s'étendent dans une zone renforcée du remblai située à l'arrière d'une face frontale de l'ouvrage, et un parement placé le long de ladite face frontale, les bandes de renforcement étant ancrées au parement dans des régions d'ancrage respectives comprenant les étapes suivantes : - mise en œuvre du procédé et/ou approvisionnement d'éléments de renfort,The invention also relates to a method of manufacturing a reinforced soil structure comprising a backfill, reinforcement strips comprising reinforcing segments which extend in a reinforced area of the embankment located at the rear of a front face of the structure, and a facing placed along said front face, the reinforcing strips being anchored to the facing in respective anchoring regions comprising the following steps: implementing the method and / or supplying reinforcement elements ,
- incorporation au parement des éléments de renfort de manière à former au moins un trajet entre deux points d'émergence situés sur une face arrière du parement adjacente au remblai où un trajet comporte deux portions rectilignes respectivement adjacentes aux deux points d'émergence et chacune disposée dans un même plan d'émergence (P) perpendiculaire à ladite face arrière, deux portions courbes prolongeant respectivement les deux portions rectilignes et disposées hors du plan d'émergence (P), et une portion de raccordement reliant entre elles les deux portions courbes et présentant au moins une boucle située en dehors du plan d'émergence.incorporation into the facing of the reinforcing elements so as to form at least one path between two emergence points situated on a rear face of the facing adjacent to the backfill where a path comprises two rectilinear portions respectively adjacent to the two emergence points and each arranged in the same plane of emergence (P) perpendicular to said face rear, two curved portions respectively extending the two rectilinear portions and disposed out of the emergence plane (P), and a connecting portion interconnecting the two curved portions and having at least one loop located outside the emergence plane.
La bande peut-être mise en place selon le trajet dès le moulage des éléments préfabriqués avec ou sans fourreau de protection. L'utilisation d'un tel fourreau isole la bande de la matière moulée pour protéger le renforcement contre un endommagement prématuré. En particulier, si le renforcement est procuré par des fibres de polyester, on sait que celles-ci admettent mal les environnements basiques tels que ceux qu'on rencontre dans le béton. Le fourreau précité complète alors la protection conférée par la gaine plastique qui enrobe les fibres de polyester de la bande.The strip can be set up according to the path as soon as the prefabricated elements are molded with or without a protective sheath. The use of such a sleeve insulates the strip from the molded material to protect the reinforcement against premature damage. In particular, if the reinforcement is provided by polyester fibers, it is known that these poorly admit basic environments such as those found in concrete. The aforementioned sleeve then completes the protection provided by the plastic sheath which coats the polyester fibers of the strip.
Si un fourreau de protection est utilisé, les bandes de renforcement sont introduites après le moulage et la liaison des segments de renfort avec un élément de liaison s'effectue après introduction des bandes de renforcement dans les éléments préfabriqués. Dans les cas où l'on ne souhaite pas utiliser de fourreau de protection, l'introduction des bandes de renforcement peut s'effectuer soit après soit avant le moulage. Il est en général avantageux de l'effectuer avant le moulage et il est possible de mouler les éléments préfabriqués avec les bandes de renforcement qui peuvent être liées par un élément de liaison soit avant, soit après le moulage. L'incorporation au moment du moulage de bandes de renforcement préalablement liées entre elles par des éléments de liaison peut être avantageuse car elle permet de séparer les étapes de mise en œuvre du procédé et de préparer les bandes de renforcement liées entre elles indépendamment de l'étape de moulage. Il peut en résulter des gains de productivité significatifs.If a protective sheath is used, the reinforcement strips are introduced after the molding and the connection of the reinforcing segments with a connecting element is carried out after introduction of the reinforcing strips in the prefabricated elements. In cases where it is not desired to use a protective sheath, the reinforcement strips can be introduced either after or before the molding. It is generally advantageous to perform it before molding and it is possible to mold the prefabricated elements with reinforcement strips that can be bonded by a connecting element either before or after molding. The incorporation at the time of molding reinforcement strips previously bonded together by connecting elements may be advantageous because it allows to separate the steps of implementation of the process and to prepare the reinforcement strips bonded together independently of the molding step. This can result in significant productivity gains.
Plusieurs dispositions sont possibles pour le trajet défini pour la bande au sein de l'élément de parement. Dans certaines réalisations, les deux portions courbes du trajet dirigent la bande vers un même côté du plan d'émergence. Dans ce cas, une première possibilité est que le trajet soit formé de façon que la bande soit reçue dans les deux portions rectilignes avec une même face de la bande orientée vers ce côté du plan d'émergence. Le trajet est alors formé de façon que ladite face de la bande soit placée soit sur le côté extérieur soit sur le côté intérieur de la boucle située en dehors du plan d'émergence. Une deuxième possibilité est que le trajet soit formé de façon que la bande soit reçue dans l'une des deux portions rectilignes avec une face de la bande orientée vers ledit côté du plan d'émergence et dans l'autre des deux portions rectilignes avec ladite face de la bande orientée à l'opposé dudit côté du plan d'émergence.Several arrangements are possible for the path defined for the band within the facing element. In some embodiments, the two curved portions of the path direct the band towards the same side of the emergence plane. In this case, a first possibility is that the path is formed so that the band is received in the two straight portions with a same face of the band oriented towards this side of the emergence plane. The path is then formed so that said face of the strip is placed either on the outer side or on the inner side of the loop located outside the emergence plane. A second possibility is that the path is formed so that the strip is received in one of the two rectilinear portions with one face of the strip facing said side of the emergence plane and in the other of the two rectilinear portions with said face of the strip facing away from said side of the emergence plane.
Dans une autre réalisation, les deux portions courbes du trajet dirigent respectivement la bande vers deux côtés opposés du plan d'émergence, et la portion de raccordement du trajet présente deux boucles prolongeant respectivement les deux portions courbes du trajet et une partie traversant le plan d'émergence et reliant entre elles les deux boucles.In another embodiment, the two curved portions of the path respectively direct the strip towards two opposite sides of the emergence plane, and the connecting portion of the path has two loops respectively extending the two curved portions of the path and a portion crossing the plane of the plane. emergence and linking together the two loops.
D'autres particularités et avantages de la présente invention apparaîtront dans la description ci-après d'exemples de réalisation non limitatifs, en référence aux dessins annexés, dans lesquels : la figure 1 est une vue schématique en coupe latérale d'un ouvrage en sol renforcé selon l'invention en cours de construction ; la figure 2 est une vue en coupe d'un élément de parement comprenant un élément de renforcement selon l'invention ; la figure 3 présente une vue en perspective d'un trajet que peut suivre une bande de renforcement au sein d'un élément de parement pour une configuration selon l'invention où une pluralité d'éléments de liaison relient entre eux des segments de renfort d'une même bande de renforcement ; - les figures 4 à 8 présentent des vues en perspective de plusieurs trajets que peuvent suivre des bandes de renforcement au sein d'éléments de parement pour des configurations selon l'invention où une pluralité d'éléments de liaison relient entre eux des segments de renfort de plusieurs bandes de renforcement distinctes ; - les figures 9 et 10 présentent des éléments de renfort utilisés dans le cadre de l'invention. Pour des raisons de clarté, les dimensions des différents éléments représentés sur ces figures ne sont pas en proportion avec leurs dimensions réelles. Sur toutes les figures, des références identiques correspondent à des éléments identiques.Other features and advantages of the present invention will appear in the following description of nonlimiting exemplary embodiments, with reference to the accompanying drawings, in which: Figure 1 is a schematic side sectional view of a structure in soil reinforced according to the invention during construction; Figure 2 is a sectional view of a facing element comprising a reinforcing element according to the invention; FIG. 3 shows a perspective view of a path that a reinforcing strip may follow in a facing element for a configuration according to the invention, in which a plurality of connecting elements connect together reinforcing segments of a same reinforcing band; FIGS. 4 to 8 show perspective views of several paths that reinforcement strips can follow in facing elements for configurations according to the invention, where a plurality of connecting elements connect reinforcement segments to each other; several separate reinforcement bands; FIGS. 9 and 10 show reinforcing elements used in the context of the invention. For the sake of clarity, the dimensions of the various elements shown in these figures are not in proportion to their actual dimensions. In all the figures, identical references correspond to identical elements.
Selon l'invention, on entend par « bande de renforcement » 2 une bande continue. Une telle bande peut comprendre un ou plusieurs segments de renfort 82, 83, 84 s' étendant dans une zone renforcée du remblai 1. en général, mais de manière non limitative, une bande de renforcement comprend deux segments de renfort.According to the invention, the term "reinforcing strip" 2 means a continuous strip. Such a strip may comprise one or more reinforcing segments 82, 83, 84 extending into a reinforced area of the backfill 1. In general, but without limitation, a reinforcing strip comprises two reinforcing segments.
La figure 1 illustre l'application de l'invention à la construction d'un mur de soutènement en sol renforcé. Un remblai compacté 1 , dans lequel sont distribués des renforcements 2, est délimité sur le côté frontal de l'ouvrage par un parement 3 constitué en juxtaposant des éléments préfabriqués 4 en forme de panneaux, et sur le côté arrière par le terrain 5 contre lequel est érigé le mur de soutènement.Figure 1 illustrates the application of the invention to the construction of a retaining wall reinforced soil. A compacted embankment 1, in which reinforcements 2 are distributed, is delimited on the front side of the structure by a facing 3 constituted by juxtaposing prefabricated elements 4 in the form of panels, and on the rear side by the ground 5 against which is erected the retaining wall.
Les renforcements 2 consistent en des armatures synthétiques en forme de bandes souples s'étendant dans des plans horizontaux à l'arrière du parement 3. Il peut notamment s'agir de bandes de renforcement à base de fibres de polyester gainées de polyéthylène.Reinforcements 2 consist of synthetic reinforcements in the form of flexible strips extending in horizontal planes behind the facing 3. It may in particular be reinforcing strips based on polyethylene fibers wrapped in polyethylene.
Les bandes de renforcement 2 sont attachées aux éléments préfabriqués 4 assemblés pour former le parement 3. Ces éléments 4 sont typiquement en béton armé. Dans l'exemple représenté, ils sont en forme de panneaux. Ils pourraient aussi avoir d'autres formes, notamment de bloc. Lorsque le béton d'un tel élément 4 est coulé, une ou plusieurs bandes de renforcement 2 sont installées dans le moule selon un trajet décrit plus loin afin de réaliser l'ancrage bande-élément. Après la prise du béton, chaque bande a deux tronçons qui sortent de l'élément pour être installés dans le massif remblayé.The reinforcing strips 2 are attached to the prefabricated elements 4 assembled to form the facing 3. These elements 4 are typically made of reinforced concrete. In the example shown, they are in the form of panels. They could also have other forms, including block. When the concrete of such an element 4 is cast, one or more reinforcement strips 2 are installed in the mold along a path described below in order to perform the strip-element anchoring. After taking the concrete, each band has two sections that leave the element to be installed in the embankment.
Pour édifier l'ouvrage, on peut procéder comme suit: a) mettre en place une partie des éléments de parement 4 afin d'être en mesure d'apporter ensuite du matériau de remblai sur une certaine hauteur. De façon connue, le montage et le positionnement des éléments de parement peuvent être facilités par des organes d'assemblage placés entre eux. Les bandes 2 sont positionnées sur les éléments de parement 4 de façon que certaines d'entre elles se placent à un même niveau horizontal lors du montage du parement ;To build the structure, you can proceed as follows: a) set up part of the cladding elements 4 in order to be able to then bring backfill material to a certain height. In known manner, the mounting and positioning of the facing elements can be facilitated by connecting members placed between them. The strips 2 are positioned on the facing elements 4 so that some of them are placed at the same horizontal level during the assembly of the facing;
b) apporter du matériau de remblai et le compacter progressivement jusqu'à atteindre le prochain niveau prévu pour la mise en place des bandes de renforcement 2 ;b) providing backfill material and progressively compacting it to the next planned level for placing reinforcement strips 2;
c) étaler les bandes de renforcement 2 sur le remblai à ce niveau ;c) spread the reinforcement strips 2 on the embankment at this level;
d) apporter du matériau de remblai par-dessus les bandes de renforcement 2 qui viennent d'être installées. Ce matériau de remblai est compacté au fur et à mesure de son apport ;d) provide backfill material over the reinforcement strips 2 that have just been installed. This backfill material is compacted as and when it is added;
e) répéter les étapes b) à d) si plusieurs niveaux de bandes sont prévus par rangée d'éléments de parement 4 ;e) repeat steps b) to d) if multiple levels of bands are provided per row of facing elements 4;
f) répéter les étapes a) à e) jusqu'à atteindre le niveau supérieur du remblai.f) Repeat steps a) to e) until reaching the upper level of the embankment.
Lors de l'apport et du compactage du matériau de remblai, les bandes de renforcement 2 déjà mises en place dans les niveaux inférieurs se tendent.During the supply and compaction of the backfill material, reinforcement strips 2 already installed in the lower levels are stretched.
Cette mise en tension résulte du frottement entre les bandes et le matériau remblayé et assure le renforcement de l'ouvrage. Pour que la tension s'établisse dans de bonnes conditions, ils convient que les bandes d'un niveau sortent de leurs éléments de parement en étant toutes bien alignées sur ce niveau. Il convient en outre qu'elles soient orientées horizontalement dès la sortie du parement, pour éviter qu'elles se vrillent dans le massif remblayé.This tensioning results from the friction between the strips and the backfilled material and ensures the reinforcement of the structure. So that the tension is established in good conditions, it is appropriate that the bands of a level leave their elements of facing while being all aligned on this level. It should also be oriented horizontally at the exit of the facing, to prevent them from twisting in the embankment.
Au niveau de leurs points 6 d'émergence hors d'un élément de parement, les deux tronçons d'une bande 2 sont dans un même plan d'émergence P (perpendiculaire au plan de la figure 2). Lors du montage du parement 3, les éléments 4 sont orientés de façon que ce plan d'émergence soit horizontal.At their points 6 emergence out of a facing element, the two sections of a strip 2 are in the same plane emergence P (perpendicular to the plane of Figure 2). When mounting the facing 3, the elements 4 are oriented so that the emergence plane is horizontal.
La figure 2 montre un élément de parement utilisable dans certaines réalisations de l'invention. Comme il est usuel, cet élément 4 est réalisé en béton moulé. Une bande de renforcement 2 est placée dans le moule au moment d'y couler le béton et maintenue jusqu'à la prise du béton. Son guidage peut être réalisé à l'aide des barres d'armature du béton (non représentées), éventuellement complétées par des tiges ou organes de déviation fixés à ces barres, afin que la bande suive le trajet souhaité dans la zone d'ancrage. Ce trajet est défini à l'intérieur de l'élément 4 entre les deux points 6 d'émergence des deux tronçons de la bande sur la face arrière 7 de l'élément (face adjacente au remblai).Figure 2 shows a facing element used in some embodiments of the invention. As is usual, this element 4 is made of molded concrete. A reinforcing strip 2 is placed in the mold when casting the concrete and maintained until the setting of the concrete. Its guidance can be achieved using the reinforcing bars of the concrete (not shown), possibly supplemented by rods or deflection members attached to these bars, so that the band follows the desired path in the anchoring zone. This path is defined inside the element 4 between the two points 6 of emergence of the two sections of the strip on the rear face 7 of the element (face adjacent to the backfill).
Un trajet 20 correspondant à un cas où une pluralité de bandes de liaison relient entre eux des segments de renfort d'une même bande de renforcement, est illustré par la figure 3. Il a deux portions rectilignes 81 s'étendant perpendiculairement à la face arrière 7 de l'élément à partir des points d'émergence 6. Dans chaque portion rectiligne 81 , la bande reste dans son plan d'émergence P. Les portions rectilignes 81 s'étendent sur au moins la moitié de l'épaisseur du corps de l'élément 4, mesurée perpendiculairement à sa face arrière 7. Ceci évite une mauvaise sollicitation du béton au voisinage de la face arrière 7.A path 20 corresponding to a case where a plurality of connecting strips connect together reinforcing segments of the same reinforcing strip, is illustrated in FIG. 3. It has two rectilinear portions 81 extending perpendicularly to the rear face. 7 in each straight portion 81, the strip remains in its emergence plane P. The rectilinear portions 81 extend over at least half the thickness of the body of the body. the element 4, measured perpendicularly to its rear face 7. This avoids bad stressing of the concrete in the vicinity of the rear face 7.
Chaque portion rectiligne 81 du trajet de la bande se prolonge par une portion courbe respective 9 où la bande est déviée hors du plan d'émergence P. Au-delà de cette portion courbe 9, la bande 2 s'étend le long de la face avant de l'élément, un peu en retrait par rapport à cette face avant afin de ne pas être apparente à la surface de l'ouvrage.Each rectilinear portion 81 of the path of the strip is extended by a respective curved portion 9 where the strip is deflected out of the emergence plane P. Beyond this curved portion 9, the strip 2 extends along the face before the element, a little behind this front so as not to be visible on the surface of the book.
Les deux portions courbes 9 sont reliées entre elles par une portion de raccordement qui présente une boucle 10 située en dehors du plan d'émergence P. Dans cet exemple, la bande est dirigée vers un même côté P1 du plan d'émergence P dans les deux portions courbes 9 de son trajet au sein de l'élément de parement 4. Ce trajet est formé de façon (i) que dans les deux portions rectilignes 8, la bande ait une même face orientée vers le côté P1 du plan d'émergence, et (ii) que cette face de la bande soit placée sur le côté extérieur de la boucle 10. En conséquence, au milieu de la boucle 10, la bande se place pratiquement perpendiculairement à la face arrière 7 de l'élément.The two curved portions 9 are interconnected by a connecting portion which has a loop 10 located outside the emergence plane P. In this example, the strip is directed towards the same side P1 of the emergence plane P in the two curved portions 9 of its path within the facing element 4. This path is formed so that (i) two rectilinear portions 8, the strip has the same face oriented towards the side P1 of the emergence plane, and (ii) that this face of the strip is placed on the outer side of the loop 10. Consequently, in the middle of the Loop 10, the band is placed substantially perpendicularly to the rear face 7 of the element.
Deux segments de renfort 82 prolongent chacun une portion rectiligne 81 dudit trajet, au-delà d'un point d'émergence 6. Une portion rectiligne 81 prolongée par un segment de renfort 82 constitue une partie rectiligne 8 d'une bande de renfort 2. Dans le cas représenté, deux parties rectilignes 8 d'une même bande de renfort sont disposées de manière sensiblement parallèle. Les deux segments de renfort 82 sont reliés entre eux par une pluralité d'éléments de liaison 11 , constitués dans l'exemple représenté de bande de même nature que la bande de renfort 2. Ces bandes de liaison 11 peuvent être agrafées, collées ou reliées par tout autre moyen aux segments de renfort 82 dans une zone 111.Two reinforcing segments 82 each extend a rectilinear portion 81 of said path, beyond an emergence point 6. A rectilinear portion 81 extended by a reinforcing segment 82 constitutes a rectilinear portion 8 of a reinforcing strip 2. In the case shown, two straight portions 8 of the same reinforcing strip are arranged substantially parallel. The two reinforcing segments 82 are interconnected by a plurality of connecting elements 11, constituted in the illustrated example of a strip of the same nature as the reinforcing strip 2. These binding strips 11 can be stapled, glued or connected. by any other means to the reinforcing segments 82 in an area 111.
Dans l'exemple représenté, les éléments de liaison 11 sont disposés selon un angle α sensiblement égal à 90°, où l'angle α mesure l'écart angulaire dans le plan P entre l'axe 80 d'un segment de renfort 82 et l'axe 110 d'un élément de liaison 11.In the example shown, the connecting elements 11 are arranged at an angle α substantially equal to 90 °, where the angle α measures the angular difference in the plane P between the axis 80 of a reinforcing segment 82 and the axis 110 of a connecting element 11.
Les figures 4 à 8 illustrent différents modes de réalisation où des bandes de renforcement 2 suivent un trajet 20 et où une pluralité d'éléments de liaison 12, 13 relient entre eux des segments de renfort 84, 83 de plusieurs bandes de renforcement 2 distinctes. Sur l'ensemble de ces figures, les bandes de renforcement 2 comprennent un premier 84 et un second 83 segments de renfort. Les premiers segments de renfort 84 de plusieurs bandes de renforcement 2 sont reliés entre eux par une pluralité d'éléments de liaison 12 et les seconds segments de renfort 83 des mêmes bandes de renforcement 2 sont reliés entre eux par une pluralité d'éléments de liaison 13.Figures 4 to 8 illustrate various embodiments where reinforcing strips 2 follow a path 20 and where a plurality of connecting elements 12, 13 connect together reinforcing segments 84, 83 of several separate reinforcing strips 2. In all of these figures, the reinforcing strips 2 comprise a first 84 and a second 83 reinforcement segments. The first reinforcing segments 84 of several reinforcing strips 2 are interconnected by a plurality of connecting elements 12 and the second reinforcing segments 83 of the same reinforcing strips 2 are interconnected by a plurality of connecting elements. 13.
Les éléments de liaison 12 et 13 sont disposés selon un angle α sensiblement égal à 90°, où l'angle α mesure l'écart angulaire dans le plan P entre l'axe 80 d'un segment de renfort, par exemple 84 et l'axe, par exemple 120 d'un élément de liaison 12.The connecting elements 12 and 13 are arranged at an angle α substantially equal to 90 °, where the angle α measures the angular difference in the plane P between the axis 80 of a reinforcing segment, for example 84 and the axis, for example 120 of a connecting element 12 .
Dans les modes de réalisation représentés, les éléments de liaison 13 qui relient entre eux les seconds segments de renfort 83 sont disposés en dessous des premiers segments de renfort 84. Ces éléments de liaison 13 sont reliés, notamment par agrafage ou collage, par le dessus aux seconds segments de renfort 83 dans des zones 131 et passent sous les premiers segments de renfort 84 dans des zones 132.In the embodiments shown, the connecting elements 13 which interconnect the second reinforcing segments 83 are arranged below the first reinforcing segments 84. These connecting elements 13 are connected, in particular by stapling or gluing, from above. the second reinforcing segments 83 in zones 131 and pass under the first reinforcing segments 84 in zones 132.
Les éléments de liaison 12 qui relient entre eux les premiers segments de renfort 84 sont reliés, notamment par agrafage ou collage, sur la face inférieure des premiers segments de renfort 84 dans des zones 121. Ces éléments de liaison 12 sont disposés au-dessus des seconds segments de renfort 83 dans des zones 122.The connecting elements 12 which interconnect the first reinforcing segments 84 are connected, in particular by stapling or gluing, to the underside of the first reinforcing segments 84 in zones 121. These connecting elements 12 are arranged above the second reinforcing segments 83 in zones 122.
La figure 4 représente un mode de réalisation où le trajet 20 est similaire à celui représenté en figure 3 à la description de laquelle on peut se reporter et où une boucle 10 fait partie du trajet 20.FIG. 4 shows an embodiment where the path 20 is similar to that shown in FIG. 3 to the description of which reference can be made and where a loop 10 is part of the path 20.
Dans la variante illustrée par la figure 5, la boucle 101 du trajet 20 est orientée en sens inverse, c'est-à-dire que la face de la bande orientée vers le côté P1 du plan d'émergence est placée sur le côté intérieur de la boucle 101.In the variant illustrated in FIG. 5, the loop 101 of the path 20 is oriented in the opposite direction, that is to say that the face of the band oriented towards the side P1 of the emergence plane is placed on the inside of the loop 101.
Dans la variante illustrée par la figure 6, la bande suit l'une des deux portions rectilignes 81 de son trajet 20 avec une de ses deux faces orientée vers le côté P1 du plan d'émergence P et l'autre des deux portions rectilignesIn the variant illustrated in FIG. 6, the strip follows one of the two rectilinear portions 81 of its path 20 with one of its two faces oriented towards the side P1 of the emergence plane P and the other of the two rectilinear portions.
81 avec ladite face orientée vers le côté P2 du plan d'émergence opposé au côté P1 et forme ainsi une boucle 102.81 with said side facing the P2 side of the emergence plane opposite the side P1 and thus forms a loop 102.
Dans la variante illustrée par la figure 7, la bande est vrillée deux fois d'un demi-tour, dans un premier et un deuxième sens pour former la boucle 103 du trajet 20. La face supérieure de la bande du côté du premier segment de renfort 84 est alors la même que celle du côté du second segment de renfort 83 d'une même bande 2.In the variant illustrated in FIG. 7, the strip is twisted twice by half a turn, in a first and a second direction to form the loop 103 of the path 20. The upper face of the strip on the side of the first segment of reinforcement 84 is then the same as that on the side of the second segment of reinforcement 83 of the same band 2.
D'autres agencements sont encore possibles pour Ie trajet de la bande de renforcement à l'intérieur d'un élément de parement. La figure 8 en montre un exemple dans lequel la portion de raccordement reliant entre elles les deux portions courbes 9 comporte deux boucles 104 de part et d'autre du plan P. Dans cet exemple, les deux portions courbes 9 du trajet dirigent respectivement la bande vers les deux côtés opposés P1 , P2 du pian d'émergence P. La portion de raccordement présente une partie 21 qui traverse le plan P et relie entre elles les deux boucles 104.Other arrangements are still possible for the path of the reinforcing strip inside a facing element. FIG. 8 shows an example in which the connecting portion interconnecting the two curved portions 9 comprises two loops 104 on either side of the plane P. In this example, the two curved portions 9 of the path respectively direct the band to the two opposite sides P1, P2 of emergence plane P. The connecting portion has a portion 21 which passes through the plane P and interconnects the two loops 104.
On note que les boucles 101 , 102, 103, 104 représentées respectivement en figures 5 à 8 peuvent se substituer à la boucle 10 représentée en figure 3 pour réaliser des modes de réalisation de l'invention alternatifs à celui représenté.Note that the loops 101, 102, 103, 104 shown respectively in Figures 5 to 8 can substitute for the loop 10 shown in Figure 3 to achieve alternative embodiments of the invention to that shown.
Pour suivre facilement un trajet tel que ceux illustrés par les figures 3 à 8, il est préférable que la largeur de la bande de renforcement 2 soit inférieure ou au plus égale à la moitié de l'épaisseur de l'élément de parementTo easily follow a path such as those illustrated in Figures 3 to 8, it is preferable that the width of the reinforcing strip 2 is less than or equal to at least half the thickness of the facing element.
4. Cette épaisseur est typiquement comprise entre 14 et 16 cm. On pourra alors utiliser des bandes de largeur 45 mm environ.4. This thickness is typically between 14 and 16 cm. It will then be possible to use strips approximately 45 mm wide.
Les figures 9 et 10 présentent des éléments de renfort utilisés dans le cadre de l'invention, où trois bandes de renforcement 2 sont disposées en parallèle. Chacune de ces bandes comprend des segments de renfort 83a, 84a disposés d'un côté et de l'autre d'un axe passant au milieu des bandes 2. Ces éléments de renfort 83a, 84a sont reliés entre eux par une pluralité d'éléments de liaison, respectivement 13a, 12a, représentés ici sous forme de partie de bandes de la même nature que les bandes 2.Figures 9 and 10 show reinforcing elements used in the context of the invention, where three reinforcing strips 2 are arranged in parallel. Each of these strips comprises reinforcing segments 83a, 84a disposed on one side and the other of an axis passing in the middle of the strips 2. These reinforcing elements 83a, 84a are interconnected by a plurality of elements 13a, 12a, here represented as part of strips of the same nature as the strips 2.
La figure 9 représente un cas où les faces des bandes 3 présentent tout leur long une orientation constante. Un tel élément de renfort peut par exemple être fabriqué en posant les bandes à plat et en agrafant les éléments de liaison 12a, 13a aux segments de renfort, respectivement 84a, 83a. Un tel élément de renfort est particulièrement avantageux car on peut rabattre, selon le sens de Ia flèche représentée, la partie comprenant les segments de renfort 84a et les éléments de liaison 12a par-dessus la partie comprenant les segments de renfort 83a et les éléments de liaison 13a. On obtient alors une boucle dans la zone centrale de l'élément de renfort, entre chaque paire de segment de renfort 83a, 84a.FIG. 9 represents a case where the faces of the strips 3 have a constant orientation all along their length. Such a reinforcing element may for example be manufactured by laying the strips flat and stapling the connecting elements 12a, 13a to the reinforcing segments, respectively 84a, 83a. Such a reinforcing element is particularly advantageous because it can be folded, according to the direction of the arrow shown, the portion comprising the reinforcing segments 84a and the connecting members 12a over the portion comprising the reinforcing segments 83a and the connecting members 13a. A loop is then obtained in the central zone of the reinforcing element between each pair of reinforcement segments 83a, 84a.
On peut alors disposer l'élément de renfort dans un moule et réaliser un élément préfabriqué après moulage, notamment avec du béton. Après disposition dans un remblai à renforcer, on obtient la configuration représentée en figure 6, où des boucles 102 sont formées. Les segments de renfort 83a et 84a de l'élément de renfort deviennent ainsi les segments de renfort 83 et 84 représentés en figure 6, les éléments de liaison de l'élément de renfort 12a, 13a deviennent ainsi les éléments de liaison 12, 13.The reinforcing element can then be placed in a mold and a prefabricated element can be produced after molding, in particular with concrete. After disposal in a backfill to be reinforced, the configuration shown in FIG. 6, where loops 102 are formed, is obtained. The reinforcing segments 83a and 84a of the reinforcing element thus become the reinforcing segments 83 and 84 shown in FIG. 6, the connecting elements of the reinforcing element 12a, 13a thus becoming the connecting elements 12, 13.
La figure 10 représente un cas où les faces des bandes de renforcement présentent un changement d'orientation. Un tel élément de renfort peut par exemple être fabriqué en posant les bandes de renforcement 2 à plat et en les vrillant d'un demi-tour dans la région 800, située par exemple sensiblement au milieu des bandes de renforcement 2.Figure 10 shows a case where the faces of the reinforcing strips have a change of orientation. Such a reinforcing element may for example be manufactured by laying the reinforcing strips 2 flat and twisting them by a half-turn in the region 800, located for example substantially in the middle of the reinforcing strips 2.
En rabattant, selon le sens de la flèche représentée, la partie comprenant les segments de renfort 84a et les éléments de liaison 12a par- dessus la partie comprenant les segments de renfort 83a et les éléments de liaison 13a, on obtient une boucle dans la zone centrale de l'élément de renfort, entre chaque paire de segment de renfort 83a, 84a.Folding, in the direction of the arrow shown, the part comprising the reinforcing segments 84a and the connecting elements 12a over the part comprising the reinforcing segments 83a and the connecting elements 13a, a loop is obtained in the zone center of the reinforcing element, between each pair of reinforcement segments 83a, 84a.
Les boucles qui se forment ainsi sont du type des boucles 103 représentées en figure 7. De même que précédemment on peut mettre en œuvre l'élément de renfort représenté en figure 10 pour obtenir la configuration représentée en figure 7.The loops which are thus formed are of the type of the loops 103 represented in FIG. 7. As previously, the reinforcement element shown in FIG. 10 can be used to obtain the configuration shown in FIG.
De façon générale, le mode de renforcement proposé, utilisant un parement d'un ouvrage en sol renforcé et des bandes de renforcement, est compatible avec un grand nombre de configurations d'ouvrage, de longueurs de bandes, de densités de mise en place de bandes, etc. In general, the proposed reinforcement method, using a siding of a reinforced soil structure and reinforcing strips, is compatible with a large number of work configurations, band lengths, densities of installation of bands, etc.

Claims

R E V E N D I C A T I O N S
1. Ouvrage en sol renforcé, comprenant un remblai (1 ), des bandes de renforcement (2) comprenant des segments de renfort (82, 83, 84) qui s'étendent dans une zone renforcée du remblai située à l'arrière d'une face frontale de l'ouvrage, et un parement (3) placé le long de ladite face frontale, les bandes de renforcement (2) étant ancrées au parement (3) dans des régions d'ancrage respectives, dans lequel le parement (3) incorpore, dans au moins une région d'ancrage, un trajet (20) formé pour une bande de renforcement (2) entre deux points d'émergence (6) situés sur une face arrière du parement (7) adjacente au remblai (1 ), et où le trajet (20) comporte deux portions rectilignes (81 ) respectivement adjacentes aux deux points d'émergence (6) et chacune disposée pour positionner la bande (2) dans un même plan d'émergence (P) perpendiculaire à ladite face arrière (7), deux portions courbes (9) prolongeant respectivement les deux portions rectilignes (81) et disposées pour dévier la bande hors du plan d'émergence (P), et une portion de raccordement reliant entre elles les deux portions courbes (9) et présentant au moins une boucle (10, 101 , 102, 103, 104) située en dehors du plan d'émergence, caractérisé en ce qu'au moins deux segments de renfort (82, 83, 84) prolongent chacun une portion rectiiigne (81 ) d'un trajet (20) au- delà d'un point d'émergence (6) et sont reliés entre eux par au moins un élément de liaison (1 1 , 12, 13) et en ce que chacun desdits segments de renfort (82, 83, 84) fait partie d'une bande de renforcement (2) disposée selon ledit trajet (20).1. Reinforced soil structure comprising a backfill (1), reinforcement strips (2) comprising reinforcement segments (82, 83, 84) which extend into a reinforced zone of the embankment located at the rear of a front face of the structure, and a facing (3) placed along said front face, the reinforcement strips (2) being anchored to the facing (3) in respective anchoring regions, wherein the facing (3) ) incorporates, in at least one anchoring region, a path (20) formed for a reinforcing strip (2) between two emergence points (6) located on a rear face of the facing (7) adjacent to the embankment (1). ), and wherein the path (20) comprises two rectilinear portions (81) respectively adjacent to the two emergence points (6) and each arranged to position the strip (2) in the same emergence plane (P) perpendicular to said rear face (7), two curved portions (9) respectively extending the two rectilinear portions (81) and disposed es to deflect the strip out of the emergence plane (P), and a connecting portion interconnecting the two curved portions (9) and having at least one loop (10, 101, 102, 103, 104) located outside of the emergence plane, characterized in that at least two reinforcing segments (82, 83, 84) each extend a rectiiigne portion (81) of a path (20) beyond an emergence point ( 6) and are interconnected by at least one connecting element (1 1, 12, 13) and in that each of said reinforcing segments (82, 83, 84) is part of a reinforcing strip (2) arranged along said path (20).
2. Ouvrage selon la revendication 1 caractérisé en ce que les éléments de liaison (1 1 , 12, 13) sont des bandes.2. Work according to claim 1 characterized in that the connecting elements (1 1, 12, 13) are strips.
3. Ouvrage selon la revendication 1 ou 2 caractérisé en ce que les éléments de liaison (1 1 , 12, 13) sont disposés selon un angle α, compris entre3. Work according to claim 1 or 2 characterized in that the connecting elements (1 1, 12, 13) are arranged at an angle α, between
30° et 150° de préférence entre 60° et 120°, voire sensiblement égal à 90°, où l'angle α mesure l'écart angulaire dans le plan P entre l'axe (80) d'un des segments de renfort (82, 83, 84) et l'axe (110, 120, 130) de l'élément de liaison (11 , 12, 13).30 ° and 150 ° preferably between 60 ° and 120 °, or even substantially equal to 90 °, where the angle α measures the angular difference in the plane P between the axis (80) of one of the reinforcing segments (82, 83, 84) and the axis (110, 120, 130) of the connecting element (11, 12, 13).
4. Ouvrage selon l'une quelconque des revendications précédentes caractérisé en ce que les segments de renfort (82, 83, 84) sont sensiblement parallèles entre eux.4. Work according to any one of the preceding claims characterized in that the reinforcing segments (82, 83, 84) are substantially parallel to each other.
5. Ouvrage selon l'une quelconque des revendications précédentes, dans lequel le parement (3) est réalisé à partir d'éléments (4) en forme de panneaux, et dans lequel les portions rectilignes (8) dudit trajet s'étendent chacune dans le plan d'émergence (P) sur au moins la moitié de l'épaisseur d'un élément de parement en forme de panneaux.A structure according to any one of the preceding claims, wherein the cladding (3) is made from panel-like elements (4), and wherein the rectilinear portions (8) of said path each extend into the emergence plane (P) over at least half the thickness of a panel-like facing element.
6. Ouvrage selon l'une quelconque des revendications précédentes, dans lequel la bande de renforcement (2) a une largeur au plus égale à la moitié de l'épaisseur du parement (3).6. A structure according to any one of the preceding claims, wherein the reinforcing strip (2) has a width at most equal to half the thickness of the facing (3).
7. Ouvrage selon l'une quelconque des revendications précédentes, dans lequel le parement (3) présente, dans la région d'ancrage, un fourreau de protection (15) recevant la bande de renforcement (2) le long dudit trajet.7. A structure according to any one of the preceding claims, wherein the facing (3) has, in the anchoring region, a protective sheath (15) receiving the reinforcing strip (2) along said path.
8. Ouvrage selon l'une quelconque des revendications précédentes caractérisé en ce que deux segments de renfort (82) reliés entre eux par au moins un élément de liaison (11 ) font partie d'une même bande de renforcement (2) disposée selon ledit trajet (20).8. Work according to any one of the preceding claims characterized in that two reinforcing segments (82) interconnected by at least one connecting element (11) are part of the same reinforcing strip (2) arranged according to said path (20).
9. Ouvrage selon la revendication précédente caractérisé en ce qu'il comprend une pluralité de bandes de renforcement (2) indépendantes entre elles et disposées selon ledit trajet (20) où chaque bande de renforcement (2) comprend deux segments de renfort (82) reliés entre eux par une pluralité d'éléments de liaison (11 ).9. Work according to the preceding claim characterized in that it comprises a plurality of reinforcing strips (2) independent of each other and arranged along said path (20) where each reinforcing strip (2) comprises two reinforcing segments (82). interconnected by a plurality of connecting elements (11).
10. Ouvrage selon l'une des revendications 1 à 7 caractérisé en ce qu'au moins deux segments de renfort (83 ou 84) reliés entre eux par au moins un élément de liaison (12, 13) font partie de deux bandes de renforcement (2) distinctes, chacune étant disposée selon ledit trajet (20).10. Work according to one of claims 1 to 7 characterized in that at least two reinforcing segments (83 or 84) interconnected by at least a connecting element (12, 13) is part of two separate reinforcement strips (2), each disposed along said path (20).
1 1. Ouvrage selon la revendication précédente caractérisé en ce que lesdites bandes de renforcement (2) distinctes comprennent chacune des premier (83) et deuxième (84) segments de renfort et en ce que les premier (83) et/ou les deuxième (84) segments de renfort sont liés entre eux par des éléments de liaison (13, respectivement 12).1 1. Work according to the preceding claim characterized in that said reinforcement strips (2) each comprise distinct first (83) and second (84) reinforcement segments and that the first (83) and / or second ( 84) reinforcement segments are interconnected by connecting elements (13, respectively 12).
12. Elément de renfort, destiné à renforcer un ouvrage comprenant un remblai (1 ), comprenant au moins deux bandes de renforcement (2) avec des segments de renfort (83a, 84a) sensiblement parallèles entre eux, caractérisé en ce que les segments de renfort (83a, 84a) de deux bandes de renforcement (2) différentes sont reliés entre eux par au moins un élément de liaison (12a, 13a) et en ce que les bandes de renforcement (2) sont vrillées d'un demi tour entre deux éléments de liaison (12a, 13a).12. Reinforcing element, intended to reinforce a structure comprising a backfill (1), comprising at least two reinforcing strips (2) with reinforcement segments (83a, 84a) substantially parallel to each other, characterized in that the segments reinforcement (83a, 84a) of two different reinforcing strips (2) are interconnected by at least one connecting element (12a, 13a) and in that the reinforcement strips (2) are twisted by half a turn between two connecting elements (12a, 13a).
13. Elément de renfort selon la revendication précédente caractérisé en ce que les éléments de liaison (12a, 13a) sont disposés sensiblement symétriquement par rapport à un axe passant par le milieu des bandes de renforcement (2) reliées entre elles.13. reinforcement element according to the preceding claim characterized in that the connecting elements (12a, 13a) are arranged substantially symmetrically with respect to an axis passing through the middle of the reinforcing strips (2) connected together.
14. Elément de renfort selon la revendication précédente caractérisé en ce que les bandes de renforcement (2) sont vrillées d'un demi-tour dans un premier sens et d'un demi-tour dans un sens opposé entre deux éléments de liaison (12a, 13a).14. reinforcement element according to the preceding claim characterized in that the reinforcing strips (2) are twisted by a half-turn in a first direction and a half-turn in an opposite direction between two connecting elements (12a , 13a).
15. Elément de renfort selon l'une quelconque des revendications 12 à 14 caractérisé en ce que les éléments de liaison (12a, 13a) sont des bandes.15. reinforcing element according to any one of claims 12 to 14 characterized in that the connecting elements (12a, 13a) are strips.
16. Procédé de fabrication d'un élément de renfort destiné à renforcer un ouvrage comprenant un remblai (1 ) comprenant les étapes successives suivantes :16. A method of manufacturing a reinforcing element for reinforcing a structure comprising an embankment (1) comprising the following successive steps:
- disposer au moins deux bandes de renforcement (2) de manière sensiblement parallèle, - relier les bandes de renforcement (2) par une pluralité d'éléments de liaison (12a, 13a),- have at least two reinforcement strips (2) substantially parallel, connecting the reinforcing strips (2) by a plurality of connecting elements (12a, 13a),
- rabattre les bandes de renforcement (2) sur elles mêmes de manière à former une boucle entre deux éléments de liaison (12a, 13a).- fold the reinforcement strips (2) on themselves to form a loop between two connecting elements (12a, 13a).
17. Procédé de fabrication d'éléments de renfort selon la revendication précédente caractérisé en ce qu'on vrille les bandes de renforcement (2) d'un demi tour avant de disposer au moins un élément de liaison (12a, 13a) de chaque côté de la partie vrillée (800).17. A method of manufacturing reinforcing elements according to the preceding claim characterized in that the reinforcement strips (2) are twisted by half a turn before arranging at least one connecting element (12a, 13a) on each side. the twisted part (800).
18. Procédé de fabrication d'un ouvrage en sol renforcé comprenant un remblai (1), des bandes de renforcement (2) comprenant des segments de renfort (82, 83, 84) qui s'étendent dans une zone renforcée du remblai située à l'arrière d'une face frontale de l'ouvrage, et un parement (3) placé le long de ladite face frontale, les bandes de renforcement (2) étant ancrées au parement (3) dans des régions d'ancrage respectives comprenant les étapes suivantes : - mise en œuvre du procédé selon les revendications 16 ou 17 et/ou approvisionnement d'éléments de renfort selon l'une quelconque des revendications 12 à 15,18. A method of manufacturing a reinforced soil structure comprising an embankment (1), reinforcement strips (2) comprising reinforcement segments (82, 83, 84) which extend in a reinforced zone of the embankment located at the rear of a front face of the structure, and a facing (3) placed along said front face, the reinforcement strips (2) being anchored to the facing (3) in respective anchoring regions comprising the following steps: - implementation of the method according to claims 16 or 17 and / or provision of reinforcing elements according to any one of claims 12 to 15,
- incorporation au parement (3) des éléments de renfort de manière à former au moins un trajet (20) entre deux points d'émergence (6) situés sur une face arrière du parement (7) adjacente au remblai (1) où un trajet (20) comporte deux portions rectilignes (81 ) respectivement adjacentes aux deux points d'émergence (6) et chacune disposée dans un même plan d'émergence (P) perpendiculaire à ladite face arrière (7), deux portions courbes (9) prolongeant respectivement les deux portions rectilignes (81) et disposées hors du plan d'émergence (P), et une portion de raccordement reliant entre elles les deux portions courbes (9) et présentant au moins une boucle (10, 101 , 102, 103, 104) située en dehors du plan d'émergence. - incorporation in the facing (3) of the reinforcing elements so as to form at least one path (20) between two emergence points (6) located on a rear face of the facing (7) adjacent to the embankment (1) where a path (20) comprises two rectilinear portions (81) respectively adjacent to the two emergence points (6) and each disposed in the same emergence plane (P) perpendicular to said rear face (7), two curved portions (9) extending respectively the two rectilinear portions (81) and arranged outside the emergence plane (P), and a connecting portion interconnecting the two curved portions (9) and having at least one loop (10, 101, 102, 103, 104) located outside the emergence plane.
EP08775656.5A 2007-03-05 2008-02-29 Ground reinforced structure and reinforcement members for the construction thereof Not-in-force EP2118384B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0701579A FR2913436B1 (en) 2007-03-05 2007-03-05 REINFORCED GROUND WORK AND REINFORCING ELEMENTS FOR ITS CONSTRUCTION
PCT/FR2008/050347 WO2008122733A1 (en) 2007-03-05 2008-02-29 Ground reinforced structure and reinforcement members for the construction thereof

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EP2118384A1 true EP2118384A1 (en) 2009-11-18
EP2118384B1 EP2118384B1 (en) 2016-05-04

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EP (1) EP2118384B1 (en)
JP (1) JP5349339B2 (en)
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WO (1) WO2008122733A1 (en)

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JP5349339B2 (en) 2013-11-20
WO2008122733A1 (en) 2008-10-16
FR2913436A1 (en) 2008-09-12
EP2118384B1 (en) 2016-05-04
FR2913436B1 (en) 2009-05-29
US20100092249A1 (en) 2010-04-15
JP2010520390A (en) 2010-06-10
US8011859B2 (en) 2011-09-06

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