EP0554161A1 - Anchorage device for a bundle of fibre filaments - Google Patents

Anchorage device for a bundle of fibre filaments Download PDF

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Publication number
EP0554161A1
EP0554161A1 EP93400184A EP93400184A EP0554161A1 EP 0554161 A1 EP0554161 A1 EP 0554161A1 EP 93400184 A EP93400184 A EP 93400184A EP 93400184 A EP93400184 A EP 93400184A EP 0554161 A1 EP0554161 A1 EP 0554161A1
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EP
European Patent Office
Prior art keywords
rods
bundle
resin
socket
reinforcing elements
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Ceased
Application number
EP93400184A
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German (de)
French (fr)
Inventor
Bruno Renoud-Lias
Roland Stenne
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Sondages Injections Forages SIF Enterprise Bachy
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Sondages Injections Forages SIF Enterprise Bachy
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Publication of EP0554161A1 publication Critical patent/EP0554161A1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

  • the invention relates to a device for anchoring a bundle of rods formed of substantially parallel fibers, linked by a synthetic resin.
  • Rods formed of substantially parallel glass fibers are well known, bonded by a synthetic resin such as an epoxy resin. It is often necessary, for applications involving significant efforts, to have recourse to a bundle of several rods. To this end, it is necessary to anchor the ends of the rods to terminal elements which serve to fix the ends of the bundle of rods in the intended application. However, due to their highly anisotropic nature, these rods pose a problem of attachment at their ends.
  • the known anchoring system consisting of inserting the ends of the rods into a hollow cylindrical metal sleeve, then pouring a mass of resin, possibly loaded or reinforced, into the sleeve so that it coats the ends of the rods, does not give complete satisfaction because, in such a system, the anchoring of each rod in the resin mass is ensured by pure adhesion. This limits the usefulness of this anchoring system to rods of small diameter and relatively low mechanical strength.
  • a known improvement of this system consists in using a metal socket whose inner part is no longer cylindrical but has the shape of a truncated cone or of a plurality of successive truncated cones, in order to create a "wedge” effect. "generating compression forces normal to the rods when the rod bundle is energized, these normal compression forces being all the more intense as the tension applied to the rods is greater.
  • said compression forces cause an axial elongation of the cast resin which, in turn, cause overvoltages in the rods. This phenomenon limits the performance of the anchor.
  • EP-A-0 025 856 and US-A-4 448 002 have proposed to limit the clamping force on the rods by providing a compressible element between the mass of resin coating the rods and a closure plate integral with the sleeve, this compressible element limiting the axial elongation of the mass of resin, as shown, for example, in Figure 9 of these earlier patents.
  • the rods instead of being directly coated with the mass of resin, are housed in metal sheaths with longitudinal slots.
  • FIG. 11 and 12 the rods, instead of being directly coated with the mass of resin, are housed in metal sheaths with longitudinal slots.
  • the mass of resin coating the rods is divided into a cylindrical central part in abutment against the closure plate, and a peripheral part forming a corner and in abutment against the compressible element, a cylindrical element made of thin metal, for example steel, provided with longitudinal slots, being interposed between these two parts to facilitate the sliding of the peripheral part relative to the central part.
  • the rods located in the peripheral part do not lengthen in the same way as the rods in the central part.
  • EP-A-0 025 865 and US-A-4 448 002 are interesting on paper, its practical implementation poses a problem as regards the choice of the compressible element. If too compressible, the tightening force on the rods will be excessive and, if not sufficiently compressible, the tightening force will be too limited with the consequence of a low efficiency of the anchoring.
  • EP-A-0 025 856 and US-A-4 448 002 moreover give practically no information on how to calculate the compressible element.
  • the device anterior anchoring is a rather complex achievement, hence a rather high foreseeable cost.
  • the invention aims precisely to form such an improved anchoring device.
  • the anchoring device of the invention unlike the device described by EP-A-0 025 856 and US-A-4 448 002, is not based on a limitation of the clamping force by using a compressible stop, but on a limitation of the axial elongation of the resin mass under the compressive forces, thanks to the incorporation of one or more reinforcing elements linked to the resin mass.
  • the invention relates to a device for anchoring a bundle of rods formed of substantially parallel fibers, linked by a synthetic resin, which comprises a metal bush surrounding the end of the bundle and a mass of resin, possibly reinforced or loaded, poured into said socket and joining the rods to each other and to the socket, the internal surface of the socket forming at least one truncated cone whose section decreases in the direction of the tensile force to which said beam will be subjected in service , characterized in that it further comprises reinforcing elements extending inside the bush, substantially parallel to the rods, these elements being made of a material having a tensile modulus greater than that of the rods and being linked to the rods and to the sleeve by said mass of resin.
  • the reinforcing elements consist of a central cylindrical core and the rods are arranged in an annular space formed between said core and the sleeve.
  • the central core can be solid or provided with a central bore.
  • the reinforcing elements consist of a plurality of bars or rods distributed, in the socket, between the rods.
  • the reinforcing elements consist of a plurality of bars or rods arranged between the rods and the sleeve.
  • the socket used in the present device does not have either a bottom plate or a plate forming a stop intended to receive or support all or part of the tensile force applied to the rods. It is not excluded, however, that the sleeve may include an end wall of low mechanical strength whose purpose would be simply to serve as formwork when filling the sleeve with resin during the casting thereof.
  • the anchoring device of the invention can be used for rods formed of glass fibers, aramid fibers ( Kevlar (R) fibers, for example), carbon fibers, etc.
  • aramid fibers Kevlar (R) fibers, for example
  • carbon fibers etc.
  • the synthetic resin poured into the socket may for example be an epoxy resin optionally loaded or reinforced with glass fibers or the like.
  • the reinforcing elements are usually made of steel, but the use of any material having a tensile modulus greater than that of the rods is conceivable.
  • the anchoring device illustrated in FIGS. 1 and 2, consists of a central cylindrical core 1, which can be solid or hollow, acting as reinforcing elements, and a socket 2, open at both ends. ends, the profile of the inner surface 3 of which is formed by three successive cone trunks 4.
  • the internal diameter of the sleeve 2 is greater than the external diameter of the core 1 so as to provide between them an annular space 5 in which the rods 6 of the bundle of rods to be anchored are inserted.
  • the rods 6 are connected to each other, to the core and to the sleeve, by a solid mass 7 of epoxy resin for example, optionally loaded or reinforced with glass fibers, thermoset, obtained by casting in the annular space 5 between the rods 6 of an epoxy resin composition for example, optionally charged or reinforced with glass fibers, thermosetting.
  • a solid mass 7 of epoxy resin for example, optionally loaded or reinforced with glass fibers, thermoset obtained by casting in the annular space 5 between the rods 6 of an epoxy resin composition for example, optionally charged or reinforced with glass fibers, thermosetting.
  • Figures 3 and 4 show another embodiment of the anchoring device of the invention.
  • the bundle of rods 6 is inserted into the socket 2 but the core 1 is omitted and replaced by a plurality of metal rods 8, for example of steel, acting as reinforcing elements, distributed between the rods, in parallel their.
  • a solid mass 7 of epoxy resin for example, optionally loaded or reinforced with glass fibers, is used to bond the rods and the rods 8 to each other and to the socket.
  • Figures 5 and 6 illustrate yet another embodiment of the anchoring device of the invention.
  • the rods 6 of the bundle are arranged in the central space delimited by the sleeve 2 as in the previous embodiment but the metal reinforcing rods 8, instead of being distributed between the rods, are arranged between the bundle of rods and socket.
  • the anchoring device of the invention makes it possible to considerably increase the bearable load.
  • the anchoring device of the invention is useful in particular in applications where a prestressing of bundles of rods based on fibers is required, for example, in the field of civil engineering, for the production of anchoring tie rods, for making guy lines for suspension bridges, etc.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The anchorage device for a bundle of filaments (6) formed by substantially parallel fibres, connected via a synthetic resin, comprises a metal bushing (2) surrounding the end of the bundle and a resin composition (7), if appropriate charged or reinforced, cast in the said bushing and joining the filaments to the bushing, the inner surface (3) of the bushing forming at least one truncated cone (4) whose cross-section decreases in the direction of the traction force to which the said bundle will be subjected on use. The anchorage device additionally comprises strengthening elements (1, 8) extending inside the bushing, substantially parallel to the filaments, consisting of a material having a modulus of tension greater than that of the filaments. Application to the production of anchoring beams, such as stay cables for suspension bridges, etc. <IMAGE>

Description

L'invention concerne un dispositif d'ancrage d'un faisceau de joncs formés de fibres sensiblement parallèles, liées par une résine synthétique.The invention relates to a device for anchoring a bundle of rods formed of substantially parallel fibers, linked by a synthetic resin.

On connaît bien des joncs formés de fibres de verre sensiblement parallèles, liées par une résine synthétique telle qu'une résine époxy. Il est souvent nécessaire, pour des applications mettant en jeu des efforts importants, d'avoir recours à un faisceau de plusieurs joncs. A cette fin, il est nécessaire d'ancrer les extrémités des joncs à des éléments terminaux qui servent à fixer les extrémités du faisceau de joncs dans l'application prévue. Toutefois, du fait de leur nature fortement anisotrope, ces joncs posent un problème de fixation à leurs extrémités. Le système d'ancrage connu consistant à insérer les extrémités des joncs dans une douille métallique cylindrique creuse, puis à couler une masse de résine, éventuellement chargée ou armée, dans la douille de façon qu'elle enrobe les extrémités des joncs, ne donne pas entière satisfaction car, dans un tel système, l'ancrage de chaque jonc dans la masse de résine est assuré par adhérence pure. Ceci limite l'utilité de ce système d'ancrage à des joncs de petit diamètre et de résistance mécanique relativement faible.Rods formed of substantially parallel glass fibers are well known, bonded by a synthetic resin such as an epoxy resin. It is often necessary, for applications involving significant efforts, to have recourse to a bundle of several rods. To this end, it is necessary to anchor the ends of the rods to terminal elements which serve to fix the ends of the bundle of rods in the intended application. However, due to their highly anisotropic nature, these rods pose a problem of attachment at their ends. The known anchoring system consisting of inserting the ends of the rods into a hollow cylindrical metal sleeve, then pouring a mass of resin, possibly loaded or reinforced, into the sleeve so that it coats the ends of the rods, does not give complete satisfaction because, in such a system, the anchoring of each rod in the resin mass is ensured by pure adhesion. This limits the usefulness of this anchoring system to rods of small diameter and relatively low mechanical strength.

Une amélioration connue de ce système consiste à utiliser une douille métallique dont la partie intérieure n'est plus cylindrique mais a la forme d'un tronc de cône ou d'une pluralité de troncs de cône successifs, afin de créer un effet de "coin" générant des efforts de compression normaux aux joncs lorsque le faisceau de joncs est mis sous tension, ces efforts de compression normaux étant d'autant plus intenses que la tension appliquée aux joncs est plus importante. Cependant, compte tenu des caractéristiques de déformation de la résine, éventuellement chargée ou armée, comparées à celles des joncs, lesdits efforts de compression provoquent une élongation axiale de la résine coulée qui, à son tour, cause des surtensions dans les joncs. Ce phénomène limite le rendement de l'ancrage.A known improvement of this system consists in using a metal socket whose inner part is no longer cylindrical but has the shape of a truncated cone or of a plurality of successive truncated cones, in order to create a "wedge" effect. "generating compression forces normal to the rods when the rod bundle is energized, these normal compression forces being all the more intense as the tension applied to the rods is greater. However, taking into account the deformation characteristics of the resin, possibly loaded or reinforced, compared to those of the rods, said compression forces cause an axial elongation of the cast resin which, in turn, cause overvoltages in the rods. This phenomenon limits the performance of the anchor.

Afin d'éviter des surtensions excessives préjudiciables aux joncs, EP-A-0 025 856 et US-A-4 448 002 ont proposé de limiter l'effort de serrage sur les joncs en prévoyant un élément compressible entre la masse de résine enrobant les joncs et une plaque de fermeture solidaire de la douille, cet élément compressible limitant l'élongation axiale de la masse de résine, comme le montre, par exemple, la figure 9 de ces brevets antérieurs. Selon une variante illustrée par les figures 11 et 12, les joncs, au lieu d'être directement enrobés par la masse de résine, sont logés dans des gaines métalliques à fentes longitudinales. Selon une autre variante illustrée sur la figure 16, la masse de résine enrobant les joncs est divisée en une partie centrale cylindrique en butée contre la plaque de fermeture, et une partie périphérique formant coin et en butée contre l'élément compressible, un élément cylindrique en métal mince, par exemple en acier, pourvu de fentes longitudinales, étant intercalé entre ces deux parties pour faciliter le glissement de la partie périphérique par rapport à la partie centrale. En outre, les joncs situés dans la partie périphérique ne s'allongent pas de la même façon que les joncs de la partie centrale.In order to avoid excessive overvoltages harmful to the rods, EP-A-0 025 856 and US-A-4 448 002 have proposed to limit the clamping force on the rods by providing a compressible element between the mass of resin coating the rods and a closure plate integral with the sleeve, this compressible element limiting the axial elongation of the mass of resin, as shown, for example, in Figure 9 of these earlier patents. According to a variant illustrated by FIGS. 11 and 12, the rods, instead of being directly coated with the mass of resin, are housed in metal sheaths with longitudinal slots. According to another variant illustrated in FIG. 16, the mass of resin coating the rods is divided into a cylindrical central part in abutment against the closure plate, and a peripheral part forming a corner and in abutment against the compressible element, a cylindrical element made of thin metal, for example steel, provided with longitudinal slots, being interposed between these two parts to facilitate the sliding of the peripheral part relative to the central part. In addition, the rods located in the peripheral part do not lengthen in the same way as the rods in the central part.

Bien que l'ancrage décrit dans EP-A-0 025 865 et US-A-4 448 002 soit intéressant sur le papier, sa réalisation pratique pose problème en ce qui concerne le choix de l'élément compressible. Si trop compressible, l'effort de serrage sur les joncs sera excessif et, si pas assez compressible, l'effort de serrage sera trop limité avec pour conséquence un faible rendement de l'ancrage. EP-A-0 025 856 et US-A-4 448 002 ne donnent d'ailleurs pratiquement pas d'indications sur la façon de calculer l'élément compressible.Although the anchoring described in EP-A-0 025 865 and US-A-4 448 002 is interesting on paper, its practical implementation poses a problem as regards the choice of the compressible element. If too compressible, the tightening force on the rods will be excessive and, if not sufficiently compressible, the tightening force will be too limited with the consequence of a low efficiency of the anchoring. EP-A-0 025 856 and US-A-4 448 002 moreover give practically no information on how to calculate the compressible element.

Enfin, il convient de remarquer que le dispositif d'ancrage antérieur est d'une réalisation plutôt complexe, d'où un coût prévisible plutôt élevé.Finally, it should be noted that the device anterior anchoring is a rather complex achievement, hence a rather high foreseeable cost.

Il existe donc un besoin pour un dispositif d'ancrage d'un faisceau de joncs fibreux qui assure une liaison améliorée entre les joncs et la douille terminale, tout en étant d'une réalisation simple et peu onéreuse.There is therefore a need for a device for anchoring a bundle of fibrous rods which ensures an improved connection between the rods and the terminal sleeve, while being of a simple and inexpensive embodiment.

L'invention vise justement à former un tel dispositif d'ancrage amélioré.The invention aims precisely to form such an improved anchoring device.

Le dispositif d'ancrage de l'invention, contrairement aux dispositif décrits par EP-A-0 025 856 et US-A-4 448 002, n'est pas basé sur une limitation de l'effort de serrage par emploi d'une butée compressible, mais sur une limitation de l'élongation axiale de la masse de résine sous les efforts de compression, grâce à l'incorporation d'un ou plusieurs éléments de renforcement liés à la masse de résine.The anchoring device of the invention, unlike the device described by EP-A-0 025 856 and US-A-4 448 002, is not based on a limitation of the clamping force by using a compressible stop, but on a limitation of the axial elongation of the resin mass under the compressive forces, thanks to the incorporation of one or more reinforcing elements linked to the resin mass.

Plus précisément, l'invention concerne un dispositif d'ancrage d'un faisceau de joncs formés de fibres sensiblement parallèles, liées par une résine synthétique, qui comprend une douille métallique entourant l'extrémité du faisceau et une masse de résine, éventuellement armée ou chargée, coulée dans ladite douille et solidarisant les joncs entre eux et à la douille, la surface intérieure de la douille formant au moins un tronc de cône dont la section diminue dans le sens de l'effort de traction auquel sera soumis ledit faisceau en service, caractérisé en ce qu'il comprend, en outre, des éléments de renforcement s'étendant à l'intérieur de la douille, sensiblement parallèlement aux joncs, ces éléments étant constitués d'un matériau ayant un module de traction supérieur à celui des joncs et étant liés aux joncs et à la douille par ladite masse de résine.More specifically, the invention relates to a device for anchoring a bundle of rods formed of substantially parallel fibers, linked by a synthetic resin, which comprises a metal bush surrounding the end of the bundle and a mass of resin, possibly reinforced or loaded, poured into said socket and joining the rods to each other and to the socket, the internal surface of the socket forming at least one truncated cone whose section decreases in the direction of the tensile force to which said beam will be subjected in service , characterized in that it further comprises reinforcing elements extending inside the bush, substantially parallel to the rods, these elements being made of a material having a tensile modulus greater than that of the rods and being linked to the rods and to the sleeve by said mass of resin.

Selon un mode de réalisation, les éléments de renforcement consistent en un noyau cylindrique central et les joncs sont disposés dans un espace annulaire ménagé entre ledit noyau et la douille. Le noyau central peut être plein ou pourvu d'un alésage central.According to one embodiment, the reinforcing elements consist of a central cylindrical core and the rods are arranged in an annular space formed between said core and the sleeve. The central core can be solid or provided with a central bore.

Selon un autre mode de réalisation, les éléments de renforcement consistent en une pluralité de barres ou tiges réparties, dans la douille, entre les joncs.According to another embodiment, the reinforcing elements consist of a plurality of bars or rods distributed, in the socket, between the rods.

Selon encore un autre mode de réalisation, les éléments de renforcement consistent en une pluralité de barres ou tiges disposées entre les joncs et la douille.According to yet another embodiment, the reinforcing elements consist of a plurality of bars or rods arranged between the rods and the sleeve.

Il peut être envisagé toute combinaison des modes de réalisation décrits précédemment.Any combination of the embodiments described above can be envisaged.

Il est à noter que la douille utilisée dans le présent dispositif ne comporte ni plaque de fond, ni plaque formant butée destinée à recevoir ou supporter tout ou partie de l'effort de traction appliqué aux joncs. Il n'est pas exclu, toutefois, que la douille puisse comporter une paroi terminale de faible résistance mécanique dont le but serait simplement de servir de coffrage lors du remplissage de la douille par la résine lors de la coulée de celle-ci.It should be noted that the socket used in the present device does not have either a bottom plate or a plate forming a stop intended to receive or support all or part of the tensile force applied to the rods. It is not excluded, however, that the sleeve may include an end wall of low mechanical strength whose purpose would be simply to serve as formwork when filling the sleeve with resin during the casting thereof.

Le dispositif d'ancrage de l'invention peut être utilisé pour des joncs formés de fibres de verre, de fibres d'aramide (fibres Kevlar( R ), par exemple), de fibres de carbone, etc..The anchoring device of the invention can be used for rods formed of glass fibers, aramid fibers ( Kevlar (R) fibers, for example), carbon fibers, etc.

La résine synthétique coulée dans la douille peut être par exemple une résine époxy éventuellement chargée ou armée de fibres de verre ou similaires.The synthetic resin poured into the socket may for example be an epoxy resin optionally loaded or reinforced with glass fibers or the like.

Les éléments de renforcement sont habituellement constitués d'acier, mais l'emploi de tout matériau ayant un module de traction supérieur à celui des joncs est envisageable.The reinforcing elements are usually made of steel, but the use of any material having a tensile modulus greater than that of the rods is conceivable.

La description qui va suivre faite en se référant aux dessins annexés fera bien comprendre l'invention. Sur les dessins :

  • Les figures 1 et 2 sont des vues en coupe longitudinale et transversale, respectivement d'un dispositif d'ancrage selon l'invention;
  • Les figures 3 et 4 sont des vues en coupe longitudinale et transversale, respectivement, d'un autre dispositif d'ancrage selon l'invention; et
  • Les figures 5 et 6 sont des vues en coupe longitudinale et transversale, respectivement, d'encore un autre dispositif d'ancrage selon l'invention.
The description which follows, made with reference to the accompanying drawings, will make the invention easier to understand. In the drawings:
  • Figures 1 and 2 are views in longitudinal and cross section, respectively of an anchoring device according to the invention;
  • Figures 3 and 4 are views in longitudinal and cross section, respectively, of another anchoring device according to the invention; and
  • Figures 5 and 6 are views in longitudinal and cross section, respectively, of yet another anchoring device according to the invention.

Le dispositif d'ancrage, illustré par les figures 1 et 2, est constitué d'un noyau cylindrique central 1, qui peut être plein ou creux, faisant office d'éléments de renforcement, et d'une douille 2, ouverte à ses deux extrémités, dont le profil de la surface intérieure 3 est formé de trois troncs de cône 4 successifs. Le diamètre intérieur de la douille 2 est supérieur au diamètre extérieur du noyau 1 de façon à ménager entre eux un espace annulaire 5 dans lequel sont insérés les joncs 6 du faisceau de joncs à ancrer. Les joncs 6 sont liés entre eux, au noyau et à la douille, par une masse solide 7 de résine époxy par exemple, éventuellement chargée ou armée de fibres de verre, thermodurcie, obtenue par coulée dans l'espace annulaire 5 entre les joncs 6 d'une composition de résine époxy par exemple, éventuellement chargée ou renforcée de fibres de verre, thermodurcissable.The anchoring device, illustrated in FIGS. 1 and 2, consists of a central cylindrical core 1, which can be solid or hollow, acting as reinforcing elements, and a socket 2, open at both ends. ends, the profile of the inner surface 3 of which is formed by three successive cone trunks 4. The internal diameter of the sleeve 2 is greater than the external diameter of the core 1 so as to provide between them an annular space 5 in which the rods 6 of the bundle of rods to be anchored are inserted. The rods 6 are connected to each other, to the core and to the sleeve, by a solid mass 7 of epoxy resin for example, optionally loaded or reinforced with glass fibers, thermoset, obtained by casting in the annular space 5 between the rods 6 of an epoxy resin composition for example, optionally charged or reinforced with glass fibers, thermosetting.

Les figures 3 et 4 représentent un autre mode de réalisation du dispositif d'ancrage de l'invention. Dans ce mode, le faisceau de joncs 6 est inséré dans la douille 2 mais le noyau 1 est omis et remplacé par une pluralité de tiges métalliques 8, par exemple en acier, faisant office d'éléments de renforcement, réparties entre les joncs, parallèlement à eux. Ici encore, une masse solide 7 de résine époxy par exemple, éventuellement chargée ou armée de fibres de verre, est utilisée pour lier les joncs et les tiges 8 entre eux et à la douille.Figures 3 and 4 show another embodiment of the anchoring device of the invention. In this mode, the bundle of rods 6 is inserted into the socket 2 but the core 1 is omitted and replaced by a plurality of metal rods 8, for example of steel, acting as reinforcing elements, distributed between the rods, in parallel their. Here again, a solid mass 7 of epoxy resin for example, optionally loaded or reinforced with glass fibers, is used to bond the rods and the rods 8 to each other and to the socket.

Les figures 5 et 6 illustrent encore un autre mode de réalisation du dispositif d'ancrage de l'invention. Dans ce mode, les joncs 6 du faisceau sont disposés dans l'espace central délimité par la douille 2 comme dans le mode de réalisation précédent mais les tiges de renforcement métallique 8, au lieu d'être réparties entre les joncs, sont disposées entre le faisceau de joncs et la douille.Figures 5 and 6 illustrate yet another embodiment of the anchoring device of the invention. In this mode, the rods 6 of the bundle are arranged in the central space delimited by the sleeve 2 as in the previous embodiment but the metal reinforcing rods 8, instead of being distributed between the rods, are arranged between the bundle of rods and socket.

La présence des éléments de renforcement améliore considérablement la résistance mécanique du faisceau de joncs. On présente ci-après les résultats d'essais de traction comparatifs réalisés entre un faisceau de joncs ancrés dans un dispositif d'ancrage conforme au mode de réalisation illustré par les figures 1 et 2 et un faisceau de joncs ancrés dans un dispositif d'ancrage de l'art antérieur constitué d'une simple douille tronconique. Dans les deux cas, la résine thermodurcissable coulée dans la douille pour lier les joncs était une résine époxy Araldite CW2418 à charge métallique. Chaque faisceau comprend 19 joncs en fibres de verre ayant chacun un diamètre de 10,7 mm. La charge de rupture instantanée de chaque jonc étant de 125 kN, la charge de rupture instantanée du faisceau était donc de 19 x 125 kN, soit 2375 kN. Le Tableau ci-dessous résume les conditions d'essai et les résultats obtenus.

Figure imgb0001
The presence of the reinforcing elements considerably improves the mechanical resistance of the rod bundle. The results of comparative tensile tests carried out between a bundle of rods anchored in an anchoring device according to the embodiment illustrated in FIGS. 1 and 2 and a bundle of rods anchored in an anchoring device are presented below. of the prior art consisting of a simple frustoconical socket. In both cases, the thermosetting resin poured into the sleeve to bond the rods was an Araldite CW2418 epoxy resin with metal charge. Each bundle includes 19 glass fiber rods each having a diameter of 10.7 mm. The instantaneous breaking load of each rod being 125 kN, the instantaneous breaking load of the beam was therefore 19 x 125 kN, or 2375 kN. The table below summarizes the test conditions and the results obtained.
Figure imgb0001

On voit que le dispositif d'ancrage de l'invention permet d'accroître considérablement la charge supportable.It can be seen that the anchoring device of the invention makes it possible to considerably increase the bearable load.

Il y a lieu de préciser que, en raison du comportement viscoélastique des joncs, la charge de rupture instantanée ne peut être atteinte avec le type de mise sous charge adopté pour les essais.It should be specified that, due to the viscoelastic behavior of the rods, the instantaneous breaking load cannot be reached with the type of loading adopted for the tests.

Le dispositif d'ancrage de l'invention est utile notamment dans les applications où une mise en précontrainte de faisceaux de joncs à base de fibres est requise, par exemple, dans le domaine du génie civil, pour la réalisation de tirants d'ancrage, pour la réalisation de haubans pour ponts suspendus, etc.The anchoring device of the invention is useful in particular in applications where a prestressing of bundles of rods based on fibers is required, for example, in the field of civil engineering, for the production of anchoring tie rods, for making guy lines for suspension bridges, etc.

Il va de soi que les modes de réalisation décrits peuvent être modifiés, notamment par substitution de moyens techniques équivalents, sans sortir pour cela du cadre de l'invention.It goes without saying that the embodiments described can be modified, in particular by substitution of equivalent technical means, without departing from the scope of the invention.

Claims (6)

Un dispositif d'ancrage d'un faisceau de joncs (6) formés de fibres sensiblement parallèles, liées par une résine synthétique, qui comprend une douille métallique (2) entourant l'extrémité du faisceau et une masse (7) de résine, éventuellement chargée ou armée, coulée dans ladite douille et solidarisant les joncs entre eux et à la douille, la surface intérieure (3) de la douille formant au moins un tronc de cône (4) dont la section diminue dans le sens de l'effort de traction auquel sera soumis ledit faisceau en service, caractérisé en ce qu'il comprend, en outre, des éléments de renforcement (1, 8) s'étendant à l'intérieur de la douille, sensiblement parallèlement aux joncs, ces éléments étant constitués d'un matériau ayant un module de traction supérieur à celui des joncs et étant liés aux joncs et à la douille par ladite masse de résine.A device for anchoring a bundle of rods (6) formed of substantially parallel fibers, linked by a synthetic resin, which comprises a metal bush (2) surrounding the end of the bundle and a mass (7) of resin, optionally loaded or armed, poured into said socket and joining the rods to each other and to the socket, the internal surface (3) of the socket forming at least one truncated cone (4) whose section decreases in the direction of the force of traction to which said beam will be subjected in service, characterized in that it further comprises reinforcing elements (1, 8) extending inside the bush, substantially parallel to the rods, these elements being made up of 'A material having a tensile modulus greater than that of the rods and being linked to the rods and to the sleeve by said mass of resin. Un dispositif selon la revendication 1, caractérisé en ce que les éléments de renforcement comportent un noyau cylindrique central et les joncs sont disposés dans un espace annulaire ménagé entre ledit noyau et la douille.A device according to claim 1, characterized in that the reinforcing elements comprise a central cylindrical core and the rods are arranged in an annular space formed between said core and the sleeve. Un dispositif selon la revendication 1, caractérisé en ce que les éléments de renforcement comportent une pluralité de barres ou tiges réparties, dans la douille, entre les joncs.A device according to claim 1, characterized in that the reinforcing elements comprise a plurality of bars or rods distributed, in the socket, between the rods. Un dispositif selon la revendication 1, caractérisé en ce que les éléments de renforcement comportent une pluralité de barres ou tiges disposées entre les joncs et la douille.A device according to claim 1, characterized in that the reinforcing elements comprise a plurality of bars or rods arranged between the rods and the bush. Un dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les éléments de renforcement sont en acier.A device according to any one of claims 1 to 4, characterized in that the reinforcing elements are made of steel. Un dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les joncs sont formés de fibres de verre liées par une résine liante polymère.A device according to any one of claims 1 to 5, characterized in that the rods are formed from glass fibers linked by a polymeric binder resin.
EP93400184A 1992-01-31 1993-01-26 Anchorage device for a bundle of fibre filaments Ceased EP0554161A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9201085 1992-01-31
FR9201085A FR2686916A1 (en) 1992-01-31 1992-01-31 DEVICE FOR ANCHORING A BEAM OF FIBROUS JONCS.

Publications (1)

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EP0554161A1 true EP0554161A1 (en) 1993-08-04

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EP93400184A Ceased EP0554161A1 (en) 1992-01-31 1993-01-26 Anchorage device for a bundle of fibre filaments

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EP (1) EP0554161A1 (en)
AU (1) AU651026B2 (en)
FR (1) FR2686916A1 (en)

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FR2798409A1 (en) * 1999-09-15 2001-03-16 Freyssinet Int Stup SYSTEM FOR CONNECTING A CABLE TO A CONSTRUCTION WORK STRUCTURE
WO2001065023A1 (en) * 2000-03-03 2001-09-07 Johann Kollegger Anchoring for a pre-tensioned and/or loaded strength member and anchor sleeve
WO2005061813A1 (en) * 2003-12-22 2005-07-07 Austria Wirtschaftsservice Gesellschaft M.B.H. Anchoring for pre-tensioned and/or stressed tensile elements
CN109024274A (en) * 2018-07-17 2018-12-18 浙锚科技股份有限公司 A kind of novel parallel steel wire HiAm anchorage and preparation method thereof
CN110258329A (en) * 2019-06-13 2019-09-20 中铁大桥科学研究院有限公司 A kind of FRP inhaul cable anchor and its installation method
EP3546668A1 (en) * 2018-03-26 2019-10-02 RUWA Drahtschweisswerk AG Anchoring element
CN113309296A (en) * 2021-06-21 2021-08-27 马献林 Fiber composite material inhaul cable elastic anchorage device

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EP1893517A1 (en) * 2005-06-09 2008-03-05 Donald Butler Curchod Improved high load connection system
CN112376803A (en) * 2020-11-18 2021-02-19 南通装配式建筑与智能结构研究院 FRP (fiber reinforced plastic) steel strand composite rib anchorage device and anchoring method

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DE2155410A1 (en) * 1971-11-08 1973-05-17 Sager & Woerner PROCEDURE FOR ANCHORING TENSIONING WIRES TO STRENGTHENED CONCRETE BODIES
EP0025856A2 (en) * 1979-08-13 1981-04-01 RESTRA-Patentverwertung GmbH Device for anchoring the end of at least one rod of fibrous composite material used as a tensioning member in prestressed concrete constructions

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DE1080284B (en) * 1953-07-30 1960-04-21 Hochtief Ag Hoch Tiefbauten Device for wedging tensioned prestressed concrete wire bundles
DE2155410A1 (en) * 1971-11-08 1973-05-17 Sager & Woerner PROCEDURE FOR ANCHORING TENSIONING WIRES TO STRENGTHENED CONCRETE BODIES
EP0025856A2 (en) * 1979-08-13 1981-04-01 RESTRA-Patentverwertung GmbH Device for anchoring the end of at least one rod of fibrous composite material used as a tensioning member in prestressed concrete constructions

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798409A1 (en) * 1999-09-15 2001-03-16 Freyssinet Int Stup SYSTEM FOR CONNECTING A CABLE TO A CONSTRUCTION WORK STRUCTURE
WO2001020081A1 (en) * 1999-09-15 2001-03-22 Freyssinet International (Stup) System for connecting a structural cable to a building work structure
US6487757B1 (en) 1999-09-15 2002-12-03 Freyssinet International (Stup) System for connecting a structural cable to a building work structure
WO2001065023A1 (en) * 2000-03-03 2001-09-07 Johann Kollegger Anchoring for a pre-tensioned and/or loaded strength member and anchor sleeve
WO2005061813A1 (en) * 2003-12-22 2005-07-07 Austria Wirtschaftsservice Gesellschaft M.B.H. Anchoring for pre-tensioned and/or stressed tensile elements
US7857542B2 (en) 2003-12-22 2010-12-28 Austria Wirtschaftsservice Gesellschaft M.B.H. Anchoring for pre-tensioned and/or stressed tensile elements
EP3546668A1 (en) * 2018-03-26 2019-10-02 RUWA Drahtschweisswerk AG Anchoring element
CN109024274A (en) * 2018-07-17 2018-12-18 浙锚科技股份有限公司 A kind of novel parallel steel wire HiAm anchorage and preparation method thereof
CN110258329A (en) * 2019-06-13 2019-09-20 中铁大桥科学研究院有限公司 A kind of FRP inhaul cable anchor and its installation method
CN110258329B (en) * 2019-06-13 2024-02-27 中铁大桥科学研究院有限公司 FRP inhaul cable anchoring device and installation method thereof
CN113309296A (en) * 2021-06-21 2021-08-27 马献林 Fiber composite material inhaul cable elastic anchorage device

Also Published As

Publication number Publication date
FR2686916A1 (en) 1993-08-06
AU3198793A (en) 1993-08-05
AU651026B2 (en) 1994-07-07

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