EP0629753A1 - Dismountable anchoring device for pre-stressing cables - Google Patents

Dismountable anchoring device for pre-stressing cables Download PDF

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Publication number
EP0629753A1
EP0629753A1 EP94401315A EP94401315A EP0629753A1 EP 0629753 A1 EP0629753 A1 EP 0629753A1 EP 94401315 A EP94401315 A EP 94401315A EP 94401315 A EP94401315 A EP 94401315A EP 0629753 A1 EP0629753 A1 EP 0629753A1
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EP
European Patent Office
Prior art keywords
corner
strand
axis
wall
housing
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.)
Withdrawn
Application number
EP94401315A
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German (de)
French (fr)
Inventor
Lucien Boutonnet
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VSL France
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VSL France
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Publication of EP0629753A1 publication Critical patent/EP0629753A1/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
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

  • the present invention relates to dismountable anchoring devices for strands which can form prestressed cables or the like used in certain masonry works, for example civil engineering structures, bridges, large buildings, tie rods in the ground, or the like, etc.
  • strand means any longitudinal element such as a wire or a plurality of wires associated with each other, for example in twisted form like strands, whatever whatever the shape, circular, square, rectangular, etc., of the section of these wires.
  • the combination of these strands associated with each other is known by technicians under the name "cables”.
  • the strands were directly embedded in the concrete of the masonry.
  • systems have been produced in which the pre-stressed strands are slid into holes made in or out of the masonry and of a larger section. than that of the strands constituting the cables, this technique in particular making it possible to interchange the strands, if necessary, without damaging the masonry.
  • anchoring devices of prestressed strands passing through masonry type works passing through a breakthrough made in these works comprising means for resting coupling their ends emerging from the breakthrough with the edge thereof.
  • These means consist, for example, of a set of wedges pinching the end of each strand of a cable between their interior surfaces, their exterior surfaces pressing against the wall of the conical inlet orifice produced in a room. wafer-shaped annex called by technicians "block anchor "which comes to rest against the face of the structure to be prestressed.
  • the set of wedges clamps the strands and retains them by resting on the edge of the conical orifice by the effect known to technicians under the name "wedge effect".
  • This device makes it possible to retain the strands well and also, theoretically, to separate them from the structure, for example for their replacement.
  • this last advantage is sometimes not usable because the corners are so anchored in the wall of the strands and that of the conical inlet orifice that it is sometimes impossible, at the same time, to pull on the strands to take off the corners of the inlet orifice and to separate these corners from the wall of the strands and in any case, completely impossible to extract them in the direction of wedging because the device is "self-wedging"
  • the present invention therefore aims to achieve a removable anchoring device of one or more prestressed strands or the like, which solves the problem mentioned above, that is to say to make possible the disassembly of the or strands in the direction of jamming between them.
  • Figures 1 and 2 show more particularly the block diagram of a removable anchoring device according to the invention, of a prestressed strand 1 or the like.
  • This device comprises an anchoring block 2 which can be of different shapes. It can be directly formed by the masonry itself or by an intermediate piece such as a wafer or the like which comes to bear on the edge of the masonry.
  • this anchor block 2 is provided a through housing 3, the strand 1 being disposed in this housing along an axis 4.
  • the housing can take different forms but, advantageously, has two opposite openings a small opening 5 and a large opening 6.
  • the strand 1 passes right through the housing to open out through the two small 5 and large 6 openings.
  • At least a first corner 7 comprising at least two first 8 and second 9 faces adapts, by its first face 8, against at least a first part 10 of the surface lateral of the strand 1, so as to wedge the strand relative to the anchoring block according to a technique well known in itself which uses the so-called "wedge" effect.
  • the device further comprises at least one shoe 11 mounted to be able to slide on a first part 12 of the wall 13 of the housing 3 in a plane not parallel to the axis 4 defined above, so as to obtain the result which will be described in the explanation of the operation of the device given below.
  • the sliding of the shoe takes place in a direction shown diagrammatically by the arrows 23 substantially perpendicular to the axis 4.
  • the shoe 11 has a first part 14 of its side wall 15 complementary to at least a portion of the second face 9 of the corner 7 , this first part 14 of the side wall of the shoe 11 cooperating with the portion of the second face 9 of the corner 7 to exert on the corner a reaction force having at least one component which is parallel to the axis 4, this component schematically represented by arrow 25 being a result of the wedge effect mentioned above.
  • the device further comprises a wedge 16 able to be disposed in contact between a second part 17 of the wall 15 of the shoe 11 and a second part 18 of the wall 13 of the housing 3 and to slide in a direction not parallel to a secant line perpendicular to the axis 4.
  • the second part 17 of the wall 15 of the shoe and the second part 18 of the wall 13 of the housing are located in planes parallel to each other and to the axis 4.
  • the sliding direction represented by the arrows 19 (FIG. 2), of the wedge 16 is substantially parallel to the axis 4.
  • the strand lengthens due to its natural elasticity.
  • the corner 7 is then arranged so that its face 8 comes to bear on the part 10 of the lateral surface of the strand 1 and that its face 9 comes against the part 14 of the wall of the shoe 11.
  • the tensile force is stopped and stranded, under the action of the restoring force generated by its elasticity natural, drives the corner towards the opening 5 of the housing, the dimensions of the corner 7 being of course defined to allow the corner to be applied perfectly on the wall of the strand and on the part 14 of the wall of the shoe.
  • the wedge Under the effect of the reaction force exerted by the wall part 14 of the shoe 11, the wedge is thus firmly anchored in the wall 10 of the strand, while being held in place along the axis 4 by at least the component 25.
  • the prestressed strand 1 is thus strongly pressed against part 21 of the wall of the housing 3 by the wedge effect.
  • the embedding of the face 8 of the corner in the wall portion 10 of the strand 1 can be accentuated by pins or the like produced on this first face 8, these pins penetrating into the wall of the strand by inlaying.
  • the device takes a shape like that illustrated in FIG. 1.
  • the shoe is no longer retained laterally and can slide on the part 12 of the wall of the housing away from the corner 7. By sliding, the shoe releases its wall part 14 from the face 9 of the corner 7 which is not more restrained. The strand is therefore no longer anchored and it is then very easy to release it.
  • the strand is held by two corners 7 and 37, that is to say does not rest directly on the wall part 21 of the housing, but via a second corner 37.
  • This second corner 37 also has at least two third 38 and fourth 39 faces, the third face 38 of this second corner being able to adapt against at least a second part 40 of the surface side of strand 1 so as to wedge the strand 1 relative to the anchor block 2 as described above.
  • first 7 and second 37 corners are associated with the strand 1 so that their second 9 and fourth 39 faces are both on a conical surface of revolution substantially centered on the axis 4.
  • the wedge 16 is constituted by a piece of strand identical to strand 1, which makes it possible to reduce the cost price of the device.
  • the strand 1 has a side wall of substantially cylindrical shape and the first face 8 of the first corner 7 and the third face 38 of the second corner 37 are portions of a cylindrical surface substantially complementary to the side surface of the strand 1. As described above with reference to FIGS. 1 and 2, these faces 8 and 38 can advantageously be lined with studs capable of penetrating or becoming embedded in the wall of the strand 1.
  • FIG. 3 and 4 shows a removable anchoring device with a single prestressed strand. It is however understood that the invention is not limited to the anchoring of a single prestressed strand but can be applied to the anchoring of a plurality of such strands.
  • Figures 5 and 6 respectively illustrate embodiments of a device according to the invention for making a removable anchorage of three and two prestressed strands.
  • the removable anchoring device of at least two prestressed strands 1-1, 1-2 and 1-3 or the like comprises an anchoring block 2, a through housing 3 produced in the block anchoring 2, the strands 1-1, 1-2 and 1-3 being arranged in the housing 3 while being parallel to the same axis 4, at least two corners 7-1, 7-2 and 7-3 each comprising at least two first and second faces as defined above with reference to FIGS. 1 to 4, the first face of each corner being able to adapt against at least one first part of the lateral surface of a strand.
  • the device also comprises at least two pads 11-1, 11-2 and 11-3 mounted to be able to slide on the wall of the housing 3 in a plane not parallel to the axis 4, each of the pads 11-1, 11-2 and 11-3 comprising a first part of its lateral wall complementary to at least a portion of the second face of a corner, the first part of the lateral wall of each shoe being able to cooperate with the portion of the second face of the corresponding corner to exert on this corner a reaction force having at least a component parallel to axis 4.
  • the device finally comprises at least one wedge 16 able to be advantageously arranged, in this embodiment, in contact between two pads, and to slide in a direction not parallel to a secant line perpendicular to the axis 4 and more particularly, as mentioned above with reference to Figures 1 to 4, parallel to axis 4.
  • the shim 16 has the same function as that described with reference to Figures 1 to 4, that is to say, to wedge a strand relative to the anchor block 2, it bears against the side wall 18 of the housing 3, but indirectly by means of pads, corners and strands.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The present invention relates to the dismountable anchoring devices for a prestressed cable or the like. The device according to the invention is characterised essentially by the fact that it comprises an anchoring block 2, a seat 3 formed in the anchoring block, the cable 1 being arranged in the seat along an axis 4, a first corner 7 which is able to fit, via one of its faces, against the lateral surface of the cable, a runner 11 mounted so as to be able to slide on a part 12 of the wall of the seat 3 in a plane not parallel to the axis 4 and comprising a part 14 of its lateral wall which is able to cooperate with another face of the corner in order to exert on this corner a force of reaction having at least one component parallel to the axis 4, and a wedge 16 which can be placed in contact between the wall 17 of the runner and a part 18 of the wall of the seat. Application in particular to the construction of large-scale masonry structures such as bridge arches or the like. <IMAGE>

Description

La présente invention concerne les dispositifs d'ancrage démontables de brins pouvant former des câbles précontraints ou analogues utilisés dans certains ouvrages de maçonnerie, par exemple les ouvrages d'art, les ponts, les grands immeubles, les tirants dans le sol, ou autres, etc.The present invention relates to dismountable anchoring devices for strands which can form prestressed cables or the like used in certain masonry works, for example civil engineering structures, bridges, large buildings, tie rods in the ground, or the like, etc.

Il est tout d'abord précisé que, dans le cadre de la présente description, le mot "brin" signifie tout élément longitudinal comme un fil ou une pluralité de fils associés les uns aux autres, par exemple sous forme torsadée comme des torons, quelle que soit la forme, circulaire, carrée, rectangulaire, etc., de la section de ces fils. La combinaison de ces brins associés entre eux est connue par les techniciens sous la dénomination "câbles" .It is firstly specified that, in the context of the present description, the word "strand" means any longitudinal element such as a wire or a plurality of wires associated with each other, for example in twisted form like strands, whatever whatever the shape, circular, square, rectangular, etc., of the section of these wires. The combination of these strands associated with each other is known by technicians under the name "cables".

Pour la réalisation de grands ouvrages de maçonnerie tels que les tabliers de ponts, on utilise des brins sur lesquels on exerce des tensions afin de leur conférer des déformations élastiques qui permettent, par les efforts de rappel qu'ils exercent sur les faces externes des ouvrages, de bien maintenir ces ouvrages en limitant, par exemple, leur fléchissement.For the realization of large masonry works such as bridge decks, strands are used on which tension is exerted in order to give them elastic deformations which allow, by the restoring forces which they exert on the external faces of the works , to maintain these structures well by limiting, for example, their deflection.

Selon une technique antérieure connue, les brins étaient directement noyés dans le béton de la maçonnerie. Cependant, pour des raisons de sécurité et de fiabilité, ainsi que pour suivre l'évolution des techniques, il a été réalisé des systèmes dans lesquels les brins précontraints sont glissés dans des percées aménagées dans ou hors la maçonnerie et d'une section plus grande que celle des brins constituant les câbles, cette technique permettant notamment d'interchanger les brins, si cela s'avère nécessaire, sans endommager la maçonnerie.According to a known prior technique, the strands were directly embedded in the concrete of the masonry. However, for reasons of safety and reliability, as well as to follow the evolution of techniques, systems have been produced in which the pre-stressed strands are slid into holes made in or out of the masonry and of a larger section. than that of the strands constituting the cables, this technique in particular making it possible to interchange the strands, if necessary, without damaging the masonry.

Pour permettre le remplacement de ces brins, il faut pouvoir intervenir sur leur dispositif de maintien ou d'ancrage pour, d'une part libérer leurs extrémités du dispositif d'ancrage, et ensuite les extraire.To allow the replacement of these strands, it must be possible to intervene on their holding or anchoring device in order, on the one hand, to release their ends from the anchoring device, and then to extract them.

Plusieurs solutions ont été envisagées pour obtenir ces résultats, mais aucune d'elles n'a, jusqu'à ce jour, donné entière satisfaction.Several solutions have been considered to obtain these results, but none of them has so far been entirely satisfactory.

Il est par exemple réalisé des dispositifs d'ancrage de brins précontraints traversant des ouvrages du type maçonnerie en passant dans une percée réalisée dans ces ouvrages, comportant des moyens pour coupler en appui leurs extrémités émergeant de la percée avec le bord de celle-ci. Ces moyens sont constitués, par exemple, par un jeu de coins pinçant l'extrémité de chaque brin d'un câble entre leurs surfaces intérieures, leurs surfaces extérieures s'appuyant contre la paroi de l'orifice d'entrée conique réalisé dans une pièce annexe en forme de galette appelée par les techniciens "bloc d'ancrage" qui vient s'appuyer contre la face de l'ouvrage à précontraindre.It is for example made of anchoring devices of prestressed strands passing through masonry type works passing through a breakthrough made in these works, comprising means for resting coupling their ends emerging from the breakthrough with the edge thereof. These means consist, for example, of a set of wedges pinching the end of each strand of a cable between their interior surfaces, their exterior surfaces pressing against the wall of the conical inlet orifice produced in a room. wafer-shaped annex called by technicians "block anchor "which comes to rest against the face of the structure to be prestressed.

Le jeu de coins pince les brins et les retient en prenant appui sur le bord de l'orifice conique par l'effet connu des techniciens sous la dénomination "effet de coin". Ce dispositif permet de bien retenir les brins et aussi, théoriquement, de les désolidariser de l'ouvrage, par exemple pour leur remplacement. Or, dans la réalité, ce dernier avantage n'est parfois pas utilisable car les coins sont tellement ancrés dans la paroi des brins et celle de l'orifice d'entrée conique qu'il est parfois impossible, à la fois, de tirer sur les brins pour décoller les coins de l'orifice d'entrée et de désolidariser ces coins de la paroi des brins et en tous cas, totalement impossible de les extraire dans le sens du coincement car le dispositif est "auto-coinçant"The set of wedges clamps the strands and retains them by resting on the edge of the conical orifice by the effect known to technicians under the name "wedge effect". This device makes it possible to retain the strands well and also, theoretically, to separate them from the structure, for example for their replacement. However, in reality, this last advantage is sometimes not usable because the corners are so anchored in the wall of the strands and that of the conical inlet orifice that it is sometimes impossible, at the same time, to pull on the strands to take off the corners of the inlet orifice and to separate these corners from the wall of the strands and in any case, completely impossible to extract them in the direction of wedging because the device is "self-wedging"

La présente invention a donc pour but de réaliser un dispositif d'ancrage démontable d'un ou de plusieurs brins précontraints ou analogues, qui permet de résoudre le problème mentionné ci-avant, c'est-à-dire de rendre possible le démontage du ou des brins dans le sens du coincement entr'autre.The present invention therefore aims to achieve a removable anchoring device of one or more prestressed strands or the like, which solves the problem mentioned above, that is to say to make possible the disassembly of the or strands in the direction of jamming between them.

Plus précisément, la présente invention a pour objet un dispositif d'ancrage démontable d'un brin précontraint ou analogue, caractérisé par le fait qu'il comporte:

  • un bloc d'ancrage,
  • un logement traversant réalisé dans ledit bloc d'ancrage, ledit brin étant disposé dans ledit logement suivant un axe,
  • au moins un premier coin comportant au moins deux première et seconde faces, la première face de cedit premier coin étant apte à s'adapter contre au moins une première partie de la surface latérale dudit brin,
  • au moins un patin monté pour être apte à coulisser sur une première partie de la paroi dudit logement dans un plan non parallèle audit axe, ledit patin comportant une première partie de sa paroi latérale complémentaire d'au moins une portion de ladite deuxième face dudit coin, cette première partie de paroi latérale dudit patin étant apte à coopérer avec ladite portion de ladite deuxième face dudit coin pour exercer sur le coin une force de réaction ayant au moins une composante parallèle audit axe, et
  • une cale apte à être disposée au contact entre une seconde partie de la paroi dudit patin et une seconde partie de la paroi dudit logement.
More specifically, the subject of the present invention is a removable anchoring device for a pre-stressed strand or the like, characterized in that it comprises:
  • an anchor block,
  • a through housing produced in said anchoring block, said strand being disposed in said housing along an axis,
  • at least a first corner comprising at least two first and second faces, the first face of said first corner being able to adapt against at least a first part of the lateral surface of said strand,
  • at least one shoe mounted to be able to slide on a first part of the wall of said housing in a plane not parallel to said axis, said shoe comprising a first part of its lateral wall complementary to at least a portion of said second face of said corner , this first side wall portion of said shoe being able to cooperate with said portion of said second face of said corner to exert on the corner a reaction force having at least one component parallel to said axis, and
  • a wedge capable of being disposed in contact between a second part of the wall of said shoe and a second part of the wall of said housing.

D'autres caractéristiques et avantages de la présente invention apparaîtront au cours de la description suivante donnée en regard des dessins annexés à titre illustratif mais nullement limitatif dans lesquels:

  • Les figures 1 et 2 représentent le schéma de principe d'un dispositif selon l'invention, respectivement dans deux positions différentes dans le but de mieux expliciter son fonctionnement et ses avantages,
  • Les figures 3 et 4 représentent deux vues d'un mode de réalisation d'un dispositif selon l'invention, la figure 3 en représentant une vue en coupe référencée III-III sur la figure 4 et la figure 4 une vue de dessus, et
  • Les figures 5 et 6 représentent, en vue de dessus, deux autres modes de réalisation d'un dispositif selon l'invention.
Other characteristics and advantages of the present invention will appear during the following description given with reference to the drawings annexed by way of illustration but in no way limitative in which:
  • FIGS. 1 and 2 represent the block diagram of a device according to the invention, respectively in two different positions in order to better explain its operation and its advantages,
  • FIGS. 3 and 4 represent two views of an embodiment of a device according to the invention, FIG. 3 showing a sectional view referenced III-III in FIG. 4 and FIG. 4 a top view, and
  • Figures 5 and 6 show, in top view, two other embodiments of a device according to the invention.

Bien que les figures représentent différents modes de réalisation d'un dispositif selon l'invention, dans le souci de simplifier la présente description et de rendre sa compréhension plus facile, les mêmes références y désignent les mêmes moyens, quelle que soit la forme de représentation de ces moyens et quelle que soit la figure sur laquelle apparaissent ces références.Although the figures represent different embodiments of a device according to the invention, in order to simplify the present description and to make it easier to understand, the same references denote the same means there, whatever the form of representation of these means and whatever the figure on which these references appear.

Les figures 1 et 2 représentent plus particulièrement le schéma de principe d'un dispositif d'ancrage démontable selon l'invention, d'un brin 1 précontraint ou analogue.Figures 1 and 2 show more particularly the block diagram of a removable anchoring device according to the invention, of a prestressed strand 1 or the like.

Ce dispositif comporte un bloc d'ancrage 2 qui peut être de différentes formes. Il peut être directement constitué par la maçonnerie elle-même ou par une pièce intermédiaire comme une galette ou analogue qui vient en appui sur le bord de la maçonnerie.This device comprises an anchoring block 2 which can be of different shapes. It can be directly formed by the masonry itself or by an intermediate piece such as a wafer or the like which comes to bear on the edge of the masonry.

Dans ce bloc d'ancrage 2 est réalisé un logement traversant 3, le brin 1 étant disposé dans ce logement suivant un axe 4. Le logement peut prendre différentes formes mais, d'une façon avantageuse, comporte deux ouvertures opposées une petite ouverture 5 et une grande ouverture 6.In this anchor block 2 is provided a through housing 3, the strand 1 being disposed in this housing along an axis 4. The housing can take different forms but, advantageously, has two opposite openings a small opening 5 and a large opening 6.

Dans une disposition avantageuse, le brin 1 traverse de part en part le logement pour déboucher par les deux petite 5 et grande 6 ouvertures.In an advantageous arrangement, the strand 1 passes right through the housing to open out through the two small 5 and large 6 openings.

Quand le brin 1 est disposé dans ce logement suivant un axe 4, au moins un premier coin 7 comportant au moins deux première 8 et seconde 9 faces s'adapte, par sa première face 8, contre au moins une première partie 10 de la surface latérale du brin 1, de façon à coincer le brin par rapport au bloc d'ancrage selon une technique bien connue en elle-même qui utilise l'effet dit "de coin".When the strand 1 is disposed in this housing along an axis 4, at least a first corner 7 comprising at least two first 8 and second 9 faces adapts, by its first face 8, against at least a first part 10 of the surface lateral of the strand 1, so as to wedge the strand relative to the anchoring block according to a technique well known in itself which uses the so-called "wedge" effect.

Le dispositif comporte en outre au moins un patin 11 monté pour être apte à coulisser sur une première partie 12 de la paroi 13 du logement 3 dans un plan non parallèle à l'axe 4 défini ci-dessus, de façon à obtenir le résultat qui sera décrit dans l'explication du fonctionnement du dispositif donnée ci-après. Dans le mode de réalisation illustré sur les figures 1 et 2, le coulissement du patin s'effectue suivant une direction schématisée par les flèches 23 sensiblement perpendiculaire à l'axe 4. Le patin 11 comporte une première partie 14 de sa paroi latérale 15 complémentaire d'au moins une portion de la deuxième face 9 du coin 7, cette première partie 14 de paroi latérale du patin 11 coopérant avec la portion de la deuxième face 9 du coin 7 pour exercer sur le coin une force de réaction ayant au moins une composante qui soit parallèle à l'axe 4, cette composante schématiquement représentée par la flèche 25 étant un résultat de l'effet de coin mentionné ci-avant.The device further comprises at least one shoe 11 mounted to be able to slide on a first part 12 of the wall 13 of the housing 3 in a plane not parallel to the axis 4 defined above, so as to obtain the result which will be described in the explanation of the operation of the device given below. In the embodiment illustrated in FIGS. 1 and 2, the sliding of the shoe takes place in a direction shown diagrammatically by the arrows 23 substantially perpendicular to the axis 4. The shoe 11 has a first part 14 of its side wall 15 complementary to at least a portion of the second face 9 of the corner 7 , this first part 14 of the side wall of the shoe 11 cooperating with the portion of the second face 9 of the corner 7 to exert on the corner a reaction force having at least one component which is parallel to the axis 4, this component schematically represented by arrow 25 being a result of the wedge effect mentioned above.

Le dispositif comporte en outre une cale 16 apte à être disposée au contact entre une seconde partie 17 de la paroi 15 du patin 11 et une seconde partie 18 de la paroi 13 du logement 3 et à coulisser suivant une direction non parallèle à une droite sécante perpendiculaire à l'axe 4. Dans une réalisation préférentielle, la seconde partie 17 de la paroi 15 du patin et la seconde partie 18 de la paroi 13 du logement sont situées dans des plans parallèles entre eux et à l'axe 4. Dans ce cas, la direction de coulissement représentée par les flèches 19 (figure 2), de la cale 16, est sensiblement parallèle à l'axe 4. Cette dernière réalisation est intéressante pour la réalisation de produits industriels comme ceux décrits ci-après en regard des figures 3 à 6.The device further comprises a wedge 16 able to be disposed in contact between a second part 17 of the wall 15 of the shoe 11 and a second part 18 of the wall 13 of the housing 3 and to slide in a direction not parallel to a secant line perpendicular to the axis 4. In a preferred embodiment, the second part 17 of the wall 15 of the shoe and the second part 18 of the wall 13 of the housing are located in planes parallel to each other and to the axis 4. In this In this case, the sliding direction represented by the arrows 19 (FIG. 2), of the wedge 16, is substantially parallel to the axis 4. This latter embodiment is advantageous for the production of industrial products such as those described below with regard to the Figures 3 to 6.

Le dispositif selon les figures 1 et 2 s'utilise de la façon suivante:The device according to Figures 1 and 2 is used as follows:

Pour ancrer un brin 1 on commence par le disposer dans le logement de façon qu'il traverse ce logement par ses deux ouvertures 5 et 6. On place ensuite le patin 1 1 dans le logement de façon qu'il repose sur sa partie 12 de paroi et en ayant interposé la cale 16 entre la partie de paroi 18 du logement 3 et la partie 17 de la paroi du patin. Les dimensions de ces deux éléments, cale et patin, sont déterminées de façon que, lorsqu'ils occupent la position décrite ci-dessus, le patin laisse, entre sa troisième partie 20 de paroi opposée à sa seconde partie 17 et la troisième partie 21 du logement opposée à la seconde partie 18, un passage 22 dont la section est supérieure à la section du brin 1 de façon que celui-ci puisse coulisser sans frictions importantes.To anchor a strand 1, we start by placing it in the housing so that it passes through this housing through its two openings 5 and 6. We then place the shoe 1 1 in the housing so that it rests on its part 12 of wall and having interposed the wedge 16 between the wall part 18 of the housing 3 and the part 17 of the wall of the shoe. The dimensions of these two elements, wedge and shoe, are determined so that, when they occupy the position described above, the shoe leaves, between its third part 20 of wall opposite to its second part 17 and the third part 21 housing opposite the second part 18, a passage 22 whose section is greater than the section of the strand 1 so that it can slide without significant friction.

Ensuite, on exerce une traction sur l'extrémité du brin émergeant de l'ouverture 6 du logement 3, son autre extrémité étant maintenue selon une technique faisant partie de l'art antérieur et qui ne sera pas décrite ici.Then, a pull is exerted on the end of the strand emerging from the opening 6 of the housing 3, its other end being maintained according to a technique which is part of the prior art and which will not be described here.

Soumis à cette traction, le brin s'allonge du fait de son élasticité naturelle. On dispose ensuite le coin 7 de façon que sa face 8 vienne s'appliquer sur la partie 10 de la surface latérale du brin 1 et que sa face 9 vienne contre la partie 14 de la paroi du patin 11. L'effort de traction est arrêté et le brin, sous l'action de la force de rappel générée par son élasticité naturelle, entraîne le coin vers l'ouverture 5 du logement, les dimensions du coin 7 étant bien sûr définies pour permettre au coin de s'appliquer parfaitement sur la paroi du brin et sur la partie 14 de la paroi du patin. Sous l'effet de la force de réaction exercée par la partie de paroi 14 du patin 11, le coin vient ainsi s'ancrer fermement dans la paroi 10 du brin, tout en étant maintenu en place selon l'axe 4 par au moins la composante 25. Le brin 1 précontraint est ainsi fortement plaqué contre la partie 21 de la paroi du logement 3 par l'effet de coin.Subjected to this traction, the strand lengthens due to its natural elasticity. The corner 7 is then arranged so that its face 8 comes to bear on the part 10 of the lateral surface of the strand 1 and that its face 9 comes against the part 14 of the wall of the shoe 11. The tensile force is stopped and stranded, under the action of the restoring force generated by its elasticity natural, drives the corner towards the opening 5 of the housing, the dimensions of the corner 7 being of course defined to allow the corner to be applied perfectly on the wall of the strand and on the part 14 of the wall of the shoe. Under the effect of the reaction force exerted by the wall part 14 of the shoe 11, the wedge is thus firmly anchored in the wall 10 of the strand, while being held in place along the axis 4 by at least the component 25. The prestressed strand 1 is thus strongly pressed against part 21 of the wall of the housing 3 by the wedge effect.

L'encastrement de la face 8 du coin dans la partie 10 de paroi du brin 1 peut être accentué par des picots ou analogues réalisés sur cette première face 8, ces picots pénétrant dans la paroi du brin par incrustation. Quand le brin est ancré, le dispositif prend une forme comme celle qui est illustrée sur la figure 1.The embedding of the face 8 of the corner in the wall portion 10 of the strand 1 can be accentuated by pins or the like produced on this first face 8, these pins penetrating into the wall of the strand by inlaying. When the strand is anchored, the device takes a shape like that illustrated in FIG. 1.

Si l'on veut, par exemple, extraire le brin, il est nécessaire de le désolidariser du bloc d'ancrage 2. Cette opération est grandement facilitée avec le dispositif selon l'invention.If it is desired, for example, to extract the strand, it is necessary to separate it from the anchoring block 2. This operation is greatly facilitated with the device according to the invention.

En se reportant plus particulièrement à la figure 2, pour désolidariser le brin du bloc d'ancrage 2, on commence, avec ou sans détention du brin, par retirer la cale 16 en tirant sur elle suivant une direction qui, dans le mode de réalisation selon les figures 1 et 2, est parallèle à l'axe 4, dans un sens ou l'autre selon les flèches 19. Comme la cale n'est maintenue qu'entre deux parois parallèles 17 et 18, elle peut facilement être enlevée en la faisant glisser sans avoir à exercer des tractions très importantes.Referring more particularly to FIG. 2, to separate the strand from the anchoring block 2, one begins, with or without holding the strand, by removing the wedge 16 by pulling on it in a direction which, in the embodiment according to Figures 1 and 2, is parallel to the axis 4, in one direction or the other according to the arrows 19. As the wedge is held only between two parallel walls 17 and 18, it can easily be removed by dragging it without having to do very large pulls.

Le patin n'est plus retenu latéralement et peut glisser sur la partie 12 de la paroi du logement en s'éloignant du coin 7. En glissant, le patin dégage sa partie de paroi 14 de la face 9 du coin 7 qui n'est plus retenu. Le brin n'est donc plus ancré et il est alors très facile de le dégager.The shoe is no longer retained laterally and can slide on the part 12 of the wall of the housing away from the corner 7. By sliding, the shoe releases its wall part 14 from the face 9 of the corner 7 which is not more restrained. The strand is therefore no longer anchored and it is then very easy to release it.

La description précédente est celle d'un mode de réalisation relativement simplifié du dispositif selon l'invention, mais il est bien évident que, sans sortir du champ de protection de l'invention, le dispositif peut prendre d'autres formes comme celle qui est illustrée sur les figures 3 et 4.The preceding description is that of a relatively simplified embodiment of the device according to the invention, but it is obvious that, without departing from the protective field of the invention, the device can take other forms such as that which is illustrated in Figures 3 and 4.

Dans le mode de réalisation selon les figures 3 et 4, le brin est maintenu par deux coins 7 et 37, c'est-à-dire ne s'appuie pas directement sur la partie de paroi 21 du logement, mais par l'intermédiaire d'un deuxième coin 37. Ce second coin 37 comporte, lui aussi, au moins deux troisième 38 et quatrième 39 faces, la troisième face 38 de ce second coin étant apte à s'adapter contre au moins une seconde partie 40 de la surface latérale du brin 1 de façon à coincer le brin 1 par rapport au bloc d'ancrage 2 comme décrit ci-dessus.In the embodiment according to FIGS. 3 and 4, the strand is held by two corners 7 and 37, that is to say does not rest directly on the wall part 21 of the housing, but via a second corner 37. This second corner 37 also has at least two third 38 and fourth 39 faces, the third face 38 of this second corner being able to adapt against at least a second part 40 of the surface side of strand 1 so as to wedge the strand 1 relative to the anchor block 2 as described above.

Dans une réalisation avantageuse, les premier 7 et second 37 coins sont associés au brin 1 de façon que leurs deuxième 9 et quatrième 39 faces soient toutes les deux sur une surface conique de révolution sensiblement centrée sur l'axe 4.In an advantageous embodiment, the first 7 and second 37 corners are associated with the strand 1 so that their second 9 and fourth 39 faces are both on a conical surface of revolution substantially centered on the axis 4.

De façon avantageuse, la cale 16 est constituée par un morceau de brin identique au brin 1, ce qui permet de réduire le coût de revient du dispositif.Advantageously, the wedge 16 is constituted by a piece of strand identical to strand 1, which makes it possible to reduce the cost price of the device.

De façon avantageuse également, le brin 1 présente une paroi latérale de forme sensiblement cylindrique et la première face 8 du premier coin 7 et la troisième face 38 du second coin 37 sont des portions d'une surface cylindrique sensiblement complémentaire de la surface latérale du brin 1. Comme décrit ci-avant en regard des figures 1 et 2, ces faces 8 et 38 peuvent être avantageusement tapissées de picots aptes à pénétrer ou s'incruster dans la paroi du brin 1.Also advantageously, the strand 1 has a side wall of substantially cylindrical shape and the first face 8 of the first corner 7 and the third face 38 of the second corner 37 are portions of a cylindrical surface substantially complementary to the side surface of the strand 1. As described above with reference to FIGS. 1 and 2, these faces 8 and 38 can advantageously be lined with studs capable of penetrating or becoming embedded in the wall of the strand 1.

Le mode de réalisation illustré sur les figures 3 et 4 représente un dispositif d'ancrage démontable d'un seul brin précontraint. Il est cependant bien entendu que l'invention ne se limite pas à l'ancrage d'un seul brin précontraint mais peut s'appliquer à l'ancrage d'une pluralité de tels brins.The embodiment illustrated in Figures 3 and 4 shows a removable anchoring device with a single prestressed strand. It is however understood that the invention is not limited to the anchoring of a single prestressed strand but can be applied to the anchoring of a plurality of such strands.

Les figures 5 et 6 illustrent respectivement des modes de réalisation d'un dispositif selon l'invention pour réaliser un ancrage démontable de trois et deux brins précontraints.Figures 5 and 6 respectively illustrate embodiments of a device according to the invention for making a removable anchorage of three and two prestressed strands.

Dans ces modes de réalisation, le dispositif d'ancrage démontable d'au moins deux brins précontraints 1-1, 1-2 et 1-3 ou analogues comporte un bloc d'ancrage 2, un logement traversant 3 réalisé dans le bloc d'ancrage 2, les brins 1-1, 1-2 et 1-3 étant disposés dans le logement 3 en étant parallèles à un même axe 4, au moins deux coins 7-1, 7-2 et 7-3 comportant chacun au moins deux première et seconde faces comme défini ci-avant en regard des figures 1 à 4, la première face de chaque coin étant apte à s'adapter contre au moins une première partie de la surface latérale d'un brin.In these embodiments, the removable anchoring device of at least two prestressed strands 1-1, 1-2 and 1-3 or the like comprises an anchoring block 2, a through housing 3 produced in the block anchoring 2, the strands 1-1, 1-2 and 1-3 being arranged in the housing 3 while being parallel to the same axis 4, at least two corners 7-1, 7-2 and 7-3 each comprising at least two first and second faces as defined above with reference to FIGS. 1 to 4, the first face of each corner being able to adapt against at least one first part of the lateral surface of a strand.

Le dispositif comporte en outre au moins deux patins 11-1, 11-2 et 11-3 montés pour être aptes à coulisser sur la paroi du logement 3 dans un plan non parallèle à l'axe 4, chacun des patins 11-1, 11-2 et 11-3 comportant une première partie de sa paroi latérale complémentaire d'au moins une portion de la deuxième face d'un coin, la première partie de paroi latérale de chaque patin étant apte à coopérer avec la portion de la deuxième face du coin correspondant pour exercer sur ce coin une force de réaction ayant au moins une composante parallèle à l'axe 4.The device also comprises at least two pads 11-1, 11-2 and 11-3 mounted to be able to slide on the wall of the housing 3 in a plane not parallel to the axis 4, each of the pads 11-1, 11-2 and 11-3 comprising a first part of its lateral wall complementary to at least a portion of the second face of a corner, the first part of the lateral wall of each shoe being able to cooperate with the portion of the second face of the corresponding corner to exert on this corner a reaction force having at least a component parallel to axis 4.

Le dispositif comporte enfin au moins une cale 16 apte à être avantageusement disposée, dans ce mode de réalisation, au contact entre deux patins, et à coulisser suivant une direction non parallèle à une droite sécante perpendiculaire à l'axe 4 et plus particulièrement, comme mentionné ci-avant en regard des figures 1 à 4, parallèle à l'axe 4.The device finally comprises at least one wedge 16 able to be advantageously arranged, in this embodiment, in contact between two pads, and to slide in a direction not parallel to a secant line perpendicular to the axis 4 and more particularly, as mentioned above with reference to Figures 1 to 4, parallel to axis 4.

Dans les modes de réalisation selon les figures 5 et 6, la cale 16 a la même fonction que celle décrite en regard des figures 1 à 4, c'est-à-dire que, pour coincer un brin par rapport au bloc d'ancrage 2, elle s'appuie contre la paroi latérale 18 du logement 3, mais indirectement par l'intermédiaire de patins, coins et brins.In the embodiments according to Figures 5 and 6, the shim 16 has the same function as that described with reference to Figures 1 to 4, that is to say, to wedge a strand relative to the anchor block 2, it bears against the side wall 18 of the housing 3, but indirectly by means of pads, corners and strands.

En outre, le fait d'interposer des éléments secondaires entre, notamment, la cale et la paroi du logement, la cale et le ou les patins, etc., ne modifie pas la nature de l'invention. De même, la réalisation en plusieurs parties des éléments constitutifs du dispositif ne modifie en rien la nature de l'invention.In addition, the fact of interposing secondary elements between, in particular, the wedge and the wall of the housing, the wedge and the pad or pads, etc., does not modify the nature of the invention. Similarly, the realization in several parts of the constituent elements of the device does not change the nature of the invention.

Le mode d'utilisation des dispositifs selon les figures 5 et 6 est identique à celui décrit en regard des figures 1 et 2. Il ne sera donc pas plus amplement décrit ici, la description donnée en regard des figures 1 et 2 étant suffisante pour comprendre le fonctionnement des dispositifs selon les figures 5 et 6 relatifs à l'ancrage d'au moins deux brins précontraints.The mode of use of the devices according to Figures 5 and 6 is identical to that described with reference to Figures 1 and 2. It will therefore not be further described here, the description given with reference to Figures 1 and 2 being sufficient to understand the operation of the devices according to FIGS. 5 and 6 relating to the anchoring of at least two prestressed strands.

Claims (9)

Dispositif d'ancrage démontable d'un brin (1) précontraint ou analogue, caractérisé par le fait qu'il comporte: - un bloc d'ancrage (2), - un logement traversant (3) réalisé dans ledit bloc d'ancrage, ledit brin étant disposé dans ledit logement suivant un axe (4), - au moins un premier coin (7) comportant au moins deux première (8) et seconde (9) faces, la première face de cedit premier coin étant apte à s'adapter contre au moins une première partie (10) de la surface latérale dudit brin, - au moins un patin (11) monté pour être apte à coulisser sur une première partie (12) de la paroi (13) dudit logement dans un plan non parallèle audit axe (4), ledit patin comportant une première partie (14) de sa paroi latérale (15) complémentaire d'au moins une portion de ladite deuxième face (9) dudit coin, cette première partie de paroi latérale dudit patin étant apte à coopérer avec ladite portion de ladite deuxième face dudit coin pour exercer sur le coin une force de réaction ayant au moins une composante (25) parallèle audit axe, et - une cale (16) apte à être disposée au contact entre une seconde partie (17) de la paroi (15) dudit patin et une seconde partie (18) de la paroi (13) dudit logement. Removable anchoring device for a pre-stressed or similar strand (1), characterized in that it comprises: - an anchor block (2), - a through housing (3) made in said anchor block, said strand being disposed in said housing along an axis (4), - at least a first corner (7) comprising at least two first (8) and second (9) faces, the first face of said first corner being able to adapt against at least a first part (10) of the lateral surface said strand, - At least one shoe (11) mounted to be able to slide on a first part (12) of the wall (13) of said housing in a plane not parallel to said axis (4), said shoe comprising a first part (14) of its side wall (15) complementary to at least a portion of said second face (9) of said corner, this first side wall portion of said shoe being able to cooperate with said portion of said second face of said corner to exert on the corner a reaction force having at least one component (25) parallel to said axis, and - a wedge (16) capable of being disposed in contact between a second part (17) of the wall (15) of said pad and a second part (18) of the wall (13) of said housing. Dispositif selon la revendication 1, caractérisé par le fait que ladite cale (16) est apte à coulisser suivant une direction non parallèle à une droite sécante perpendiculaire audit axe (4).Device according to claim 1, characterized in that said wedge (16) is capable of sliding in a direction not parallel to a secant line perpendicular to said axis (4). Dispositif selon l'une des revendications 1 et 2, caractérisé par le fait que ladite cale (16) est constituée par une portion de brin (1).Device according to one of claims 1 and 2, characterized in that said shim (16) is constituted by a portion of strand (1). Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que ledit brin (1) présente une paroi latérale de forme sensiblement cylindrique et que la première face (8) dudit premier coin (7) est une surface cylindrique sensiblement complémentaire de la surface latérale dudit brin.Device according to one of claims 1 to 3, characterized in that said strand (1) has a side wall of substantially cylindrical shape and that the first face (8) of said first corner (7) is a cylindrical surface substantially complementary to the lateral surface of said strand. Dispositif selon l'une des revendications 1 à 4, caractérisé par le fait que ladite seconde partie (17) de la paroi (15) dudit patin (11) et ladite seconde partie (18) de la paroi (13) dudit logement (3) sont situées dans des plans parallèles entre eux et audit axe (4).Device according to one of claims 1 to 4, characterized in that said second part (17) of the wall (15) of said shoe (11) and said second part (18) of the wall (13) of said housing (3 ) are located in planes parallel to each other and to said axis (4). Dispositif selon l'une des revendications 1 à 5, caractérisé par le fait que ladite direction de coulissement (19) de la cale (16) est sensiblement parallèle audit axe (4).Device according to one of claims 1 to 5, characterized in that said sliding direction (19) of the wedge (16) is substantially parallel to said axis (4). Dispositif selon l'une des revendications 1 à 6, caractérisé par le fait qu'il comporte un second coin (37) comportant au moins deux troisième (38) et quatrième (39) faces, la troisième face de ce second coin étant apte à s'adapter contre au moins une seconde partie (40) de la surface latérale dudit brin (1).Device according to one of claims 1 to 6, characterized in that it comprises a second corner (37) comprising at least two third (38) and fourth (39) faces, the third face of this second corner being able to fitting against at least a second part (40) of the lateral surface of said strand (1). Dispositif selon la revendication 7, caractérisé par le fait que lesdits premier (7) et second (37) coins sont associés audit brin de façon que leurs deuxième (9) et quatrième (39) faces soient toutes les deux sur une surface conique de révolution centrée sur ledit axe (4).Device according to claim 7, characterized in that said first (7) and second (37) corners are associated with said strand so that their second (9) and fourth (39) faces are both on a conical surface of revolution centered on said axis (4). Dispositif d'ancrage démontable d'au moins deux brins (1-1, 1-2, 1-3) précontraints ou analogues, caractérisé par le fait qu'il comporte : - un bloc d'ancrage (2), - un logement traversant (3) réalisé dans ledit bloc d'ancrage, lesdits brins étant disposés dans ledit logement en étant parallèles à un même axe (4), - au moins deux coins (7-1, 7-2, 7-3) comportant chacun au moins deux première et seconde faces, la première face de chaque coin étant apte à s'adapter contre au moins une première partie de la surface latérale d'un brin (1-1, 1-2, 1-3), - au moins deux patins (11-1, 11-2, 11-3) montés pour être aptes à coulisser sur la paroi dudit logement dans un plan non parallèle audit axe, chacun desdits patins comportant une première partie de sa paroi latérale complémentaire d'au moins une portion de ladite deuxième face d'un coin, la première partie de paroi latérale de chaque patin étant apte à coopérer avec la portion de ladite deuxième face du coin correspondant pour exercer sur ce coin une force de réaction ayant au moins une composante parallèle audit axe, et - au moins une cale (16) apte à être disposée au contact entre les deux dits patins (11-1, 11-2, 11-3), ladite cale étant apte à coulisser suivant une direction non parallèle à une droite sécante perpendiculaire audit axe (4). Removable anchoring device of at least two strands (1-1, 1-2, 1-3) prestressed or the like, characterized in that it comprises: - an anchor block (2), - a through housing (3) produced in said anchor block, said strands being arranged in said housing being parallel to the same axis (4), - at least two corners (7-1, 7-2, 7-3) each comprising at least two first and second faces, the first face of each corner being able to adapt against at least a first part of the lateral surface a strand (1-1, 1-2, 1-3), - At least two pads (11-1, 11-2, 11-3) mounted to be able to slide on the wall of said housing in a plane not parallel to said axis, each of said pads comprising a first part of its complementary side wall d '' at least a portion of said second face of a corner, the first side wall portion of each shoe being able to cooperate with the portion of said second face of the corresponding corner to exert on this corner a reaction force having at least one component parallel to said axis, and - At least one wedge (16) able to be placed in contact between the two said pads (11-1, 11-2, 11-3), said wedge being able to slide in a direction not parallel to a secant line perpendicular to said axis (4).
EP94401315A 1993-06-18 1994-06-13 Dismountable anchoring device for pre-stressing cables Withdrawn EP0629753A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307519A FR2706508B1 (en) 1993-06-18 1993-06-18 Removable anchoring device for prestressed cables.
FR9307519 1993-06-18

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EP0629753A1 true EP0629753A1 (en) 1994-12-21

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB710089A (en) * 1950-11-14 1954-06-09 Leo Coff Improvements in and relating to reinforcements for prestressed concrete and to meansfor use in stressing such reinforcements
GB727988A (en) * 1952-04-01 1955-04-13 Ferroconcrete Lancashire Ltd Improvements in or relating to gripping devices for releasably holding an end of a wire or the like whilst the latter is under tension
GB730702A (en) * 1952-07-05 1955-05-25 Holzmann Philipp Ag Improvements in or relating to the anchoring of stressing wires for pre-stressed concrete
GB775743A (en) * 1954-11-10 1957-05-29 P S C Equipment Ltd An improved device for clamping around metal wire or rod
US3078535A (en) * 1960-06-13 1963-02-26 Greenlee Bros & Co Wire clamp
FR2348335A1 (en) * 1976-04-15 1977-11-10 Andrivot Jean Tie piece for prestressed concrete reinforcement - has inner peg screwed into ring and received in bore of shaft
GB2077343A (en) * 1980-05-24 1981-12-16 Strabag Bau Ag Anchorage devices for a bundle of tension wires
EP0098927A2 (en) * 1979-08-13 1984-01-25 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
FR2678036A1 (en) * 1991-06-20 1992-12-24 Kley France LOCKING DEVICE FOR LIVE CABLE.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB710089A (en) * 1950-11-14 1954-06-09 Leo Coff Improvements in and relating to reinforcements for prestressed concrete and to meansfor use in stressing such reinforcements
GB727988A (en) * 1952-04-01 1955-04-13 Ferroconcrete Lancashire Ltd Improvements in or relating to gripping devices for releasably holding an end of a wire or the like whilst the latter is under tension
GB730702A (en) * 1952-07-05 1955-05-25 Holzmann Philipp Ag Improvements in or relating to the anchoring of stressing wires for pre-stressed concrete
GB775743A (en) * 1954-11-10 1957-05-29 P S C Equipment Ltd An improved device for clamping around metal wire or rod
US3078535A (en) * 1960-06-13 1963-02-26 Greenlee Bros & Co Wire clamp
FR2348335A1 (en) * 1976-04-15 1977-11-10 Andrivot Jean Tie piece for prestressed concrete reinforcement - has inner peg screwed into ring and received in bore of shaft
EP0098927A2 (en) * 1979-08-13 1984-01-25 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
GB2077343A (en) * 1980-05-24 1981-12-16 Strabag Bau Ag Anchorage devices for a bundle of tension wires
FR2678036A1 (en) * 1991-06-20 1992-12-24 Kley France LOCKING DEVICE FOR LIVE CABLE.

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FR2706508B1 (en) 1995-09-08
FR2706508A1 (en) 1994-12-23

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