EP2594700A1 - Construction cable and process for anchoring such a cable - Google Patents

Construction cable and process for anchoring such a cable Download PDF

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Publication number
EP2594700A1
EP2594700A1 EP12193091.1A EP12193091A EP2594700A1 EP 2594700 A1 EP2594700 A1 EP 2594700A1 EP 12193091 A EP12193091 A EP 12193091A EP 2594700 A1 EP2594700 A1 EP 2594700A1
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EP
European Patent Office
Prior art keywords
cavity
reinforcements
opening
longitudinal direction
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12193091.1A
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German (de)
French (fr)
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EP2594700B1 (en
Inventor
Ivica Zivanovic
Ronan Solet
François Voyat
Philippe Salmon
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Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Publication of EP2594700A1 publication Critical patent/EP2594700A1/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
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/58—Prestressed concrete piles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the present invention relates to the structural cables used in the construction, and more particularly the methods used to anchor them on a construction work.
  • the topology of the structure to be equipped with the structural cable, or other constraints specific to the design or construction site, may prevent access to the rear side of the anchorage.
  • Floating anchors are particularly used in the case of tie rods used to reinforce a solid mass. It then only accesses a front face of the massif in which is penetrated a reinforcing cable. Another application case is that of the prestressing of a concrete wall molded in place without access to the lower face of the raft or support receiving the wall.
  • French Patent No. 693,873 discloses an embedded anchoring system for a parallel-wire cable, comprising a cavity in which the ends of the wires of the cable are engaged by mutually separating these wires, and then cement is injected to seal the whole.
  • Each individual wire subjected to tensile stresses is maintained in the cavity essentially by longitudinal adhesion, which may be insufficient.
  • longitudinal adhesion which may be insufficient.
  • each armature of the cable must be provided with a special shaped end piece, adapted so that the armature can be pushed to the bottom of the cavity despite the presence of other reinforcement already introduced.
  • the frames are introduced one by one so that they come to find their places at the bottom of the cavity. The implementation of such an anchoring process is long and delicate.
  • the frames can be engaged together or in groups, which allows to go quickly enough while controlling the distribution of the reinforcements with their enlarged parts inside the cavity.
  • the distribution in several layers advantageously limits the transverse bulk of the bundle of reinforcement when it is introduced through the conduit to the cavity.
  • the structural cable further comprises at least one spacer member protruding into a bottom of the cavity located opposite the opening in the longitudinal direction, so that the reinforcements bloom at the inside the cavity.
  • the spacer member separates the ends reinforcements at the bottom of the cavity, which ensures their development and allows a firm anchoring of the cable with the mass of the sealing material injected into the cavity.
  • the spacer member is for example of generally conical and / or spherical shape. It can be mounted on a rod fixed to the bottom of the cavity or directly on the bottom wall.
  • the enlarged portions of the ends of the armatures may have a shoulder forming a stop in the direction of the opening of the cavity. This shoulder allows the hardened sealing material to oppose a high reaction force to the reinforcement subjected to tensile forces.
  • Another aspect of the present invention relates to a construction structure, comprising at least one structural cable as defined above.
  • the reinforcement is introduced into the duct (and the cavity) in at least one group of several reinforcements, the reinforcements of each group being introduced together into the cavity.
  • the armatures are all introduced in a single group in the cavity.
  • the figure 1 illustrates an example of reinforcement for implementing the invention.
  • the armature 1 consists in this example of a strand formed of seven metal wires, one end 2 of which is provided with an enlarged part 3.
  • reinforcements of this type may be assembled parallel to each other to form a beam 4 which, once anchored on a construction work, will constitute a structural cable.
  • the enlarged portion 3 may be made by mechanical treatment directly on the end 2 of the frame if the material and the constitution of this frame allow. It may also consist of an end piece firmly fixed to the end of the frame 1, for example by hot or cold crimping, welding, bonding, bolting, etc.
  • the end piece 3 is in the general shape of a cylindrical sleeve, with a shoulder 3 'forming a stop towards the active part of the structural cable, that is to say the part or the armatures work in tension (towards the front side of the anchor), and another shoulder 3 "on the opposite side
  • the stops formed by these shoulders 3 ', 3" are surfaces substantially perpendicular to the longitudinal direction X of the reinforcements 1.
  • the enlarged portions 3 of the reinforcements 1 can be distributed in several layers offset along the longitudinal direction X. In the example shown in FIG. figure 2 they are divided into three layers. This layer distribution minimizing the total cross section of the reinforcement bundle 4 is facilitated by the cylindrical shape of the sleeves forming the enlarged parts 3.
  • the figure 3 shows an example of part 6 used to form an anchoring cavity 8 in a concrete structure. It may consist of a tromplaque (a diffusion part of the force), of the same kind as those commonly used in pretensioning cable anchors, whose internal volume of generally frustoconical shape around an axis of symmetry Y defines the anchoring cavity 8.
  • This cavity 8 has an opening 9 on its side of smaller section on which is connected the prestressing duct (sheath or tube). On the opposite side, of widest section, it is closed by a bottom plate 10 fixed to the surface of the part 6.
  • This piece 6 may have radial or helical ribs 11 which will improve its retention in the surrounding concrete and the transfer of forces between the cable and the structure.
  • the wall or the bottom 10 of the part 6 may furthermore have one or more injection conduits 12 which may serve to fill the cavity 8 with a sealant, for example a grout of cement, mortar or resin.
  • the figure 4 shows piece 6 after its installation in the concrete structure.
  • the concrete has been poured completely (around the duct, the part 6 and behind the bottom plate 10), so that the anchoring cavity 8 is not accessible except from the opposite end through the conduit (as for a conventional prestressing cable) and up to the opening 9 formed on its smaller section side.
  • the sheath or preloading duct 5 is connected to the opening 9 of the cavity 8.
  • This sheath 5 will contain the bundle of reinforcements 4 of the prestressing cable (see FIG. Figures 5 and 6 ).
  • the part 6 can be embedded in the raft of a concrete structure, while the prestressing sheath 5 is embedded in the concrete wall that stands above the raft.
  • the prestressing sheath 5 and the part 6 are mounted with their longitudinal axis Y parallel to a vertical direction.
  • care is taken to set up an injection tube 13 which is connected to the injection conduit 12 provided in the part 6, leaving the tube 13 accessible from the outside once the concrete sank.
  • the injection tube 13 is disposed inside the duct at the same time as the introduction of the reinforcements. In this case, the conduit 12 on the part is previously plugged.
  • the raft is concreted first, the opening 9 of the anchoring cavity remaining accessible on the upper face of this raft.
  • the bundle of reinforcements 4 is brought, surrounded by the sheath The lower part of the bundle of reinforcements 4 is engaged in the cavity 8 through the opening 9, then the sheath 5 is connected to the opening 9.
  • the sheath 5 is positioned in the mold where the concreting of the wall to be prestressed is carried out.
  • the sealant is limited in height as illustrated on the figure 6 , for example up to the opening 9, to allow to have the free length for the subsequent tensioning of the structural cable.
  • the free length is then injected with a filler and protection against corrosion.
  • the sealant may cover the entire length of the cable as the reinforcement is stripped and cleaned on the seal-limited part to allow adhesion during subsequent tensioning of the structural cable as in the general case.
  • the structural cable can be tensioned in a conventional manner, by pulling it at its end opposite to that anchored in the cavity 8.
  • the tensile force on a reinforcement 1 at the level of the anchoring is transmitted to the cured sealant mass through the shoulder 3 'of its enlarged portion 3, which forms a stop in the direction of the opening 9 of the cavity.
  • the tensile force of the cable is diffused to the structural concrete via the part 6.
  • the shape of the internal anchoring cavity 8 has at least a portion of larger section than the opening 9 transversely to a longitudinal direction Y.
  • One possibility for doing so is to use the variant embodiment illustrated by the Figures 7 to 10 .
  • the part 6 defining the anchoring cavity 8 is modified to include a spacer member 16 projecting into said cavity.
  • a spacer member 16 at the bottom of the cavity 8 mounted on the Y axis. This member 16 positioned in the cavity 8 is fixed in the center of the bottom plate 10 closing the cavity 8 opposite its opening 9.
  • beam 4 is composed of individually wrapped strands and sliding 17.
  • the armatures 1 of the beam 4 are illustrated in number of three.
  • the spacer member 16 has an upper portion 14 directed towards the opening 9 of the anchoring cavity 8.
  • This upper portion 14 may have a spherical and / or conical shape to facilitate the spacing of the reinforcements of the beam.
  • the spacer member 16 may be in one spherical or conical piece, or mounted on top of a rod fixed in the center of the bottom of the anchoring cavity, as illustrated in FIGS. Figures 7-10 . It can also be positioned higher towards the opening 9.
  • the cavity 8 and the pipe 5 can be filled with the sealant at one time. This filling is done according to the arrow F as illustrated in the figure 9 , via the injection tube or tubes 13 disposed inside the conduit 5 at the same time as the introduction of the reinforcements.
  • the sealant covers the entire bundle (from the bottom of the workpiece 6 to the upper end of the sliding sheathed strands). After curing, the structure cable can be tensioned as previously described.
  • a drilled anchor of relatively short length is finally and effectively obtained, and the whole of the cable is also introduced into the anchoring cavity 8 in one go.
  • a collective introduction of the reinforcements is kept inside the anchoring cavity 8, but this introduction is successively carried out in several groups and not only one.
  • each group, or sub-beam, of reinforcements is assembled, by providing the spatial distribution of the enlarged portions 3 at their ends ( figure 2 ), before being introduced into the cavity.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The structure has a set of reinforcements (1) that is provided under tension, where each of the set of reinforcements is arranged with an end that is provided with a widened portion. A cavity is formed in the structure, and a sealing material is filled in the cavity that contains the end of the reinforcements. The widened portion of the reinforcements is divided into a set of layers that is shifted according to a longitudinal direction (Y) of the cavity. An independent claim is also included for a method for anchoring a cable structure.

Description

La présente invention concerne les câbles de structure utilisés dans la construction, et plus particulièrement les méthodes servant à les ancrer sur un ouvrage de construction.The present invention relates to the structural cables used in the construction, and more particularly the methods used to anchor them on a construction work.

De nombreux systèmes utilisés pour ancrer des câbles de structure composés d'armatures multiples laissent accessible un côté arrière du câble, permettant de tenir et/ou tirer des extrémités libres des armatures (à l'opposé de leurs parties actives destinées à la mise en tension et de les bloquer. Le blocage est souvent réalisé à l'aide de mors tronconiques.Many systems used to anchor structural cables composed of multiple reinforcements leave accessible a rear side of the cable, for holding and / or pulling free ends of the armatures (opposite their active parts for tensioning) Blocking is often done with frustoconical jaws.

Néanmoins, la topologie de l'ouvrage à équiper du câble de structure, ou d'autres contraintes propres à la conception ou au chantier, peuvent empêcher l'accès au côté arrière de l'ancrage. On a alors recours à une technique dite d'ancrage noyé. Avec un tel ancrage, on accède sur le côté avant (opposé) à une cavité aménagée dans l'ouvrage pour recevoir l'extrémité du câble à ancrer, et on y enfile les armatures constitutives du câble.Nevertheless, the topology of the structure to be equipped with the structural cable, or other constraints specific to the design or construction site, may prevent access to the rear side of the anchorage. We then resort to a so-called embedded anchoring technique. With such an anchor, it is accessed on the front side (opposite) to a cavity in the structure to receive the end of the cable to be anchored, and it is threaded the reinforcements of the cable.

Des ancrages noyés sont notamment utilisés dans le cas des tirants d'ancrage utilisés pour renforcer un massif. On n'accède alors qu'à une face avant du massif dans lequel on fait pénétrer un câble de renforcement. Un autre cas d'application est celui de la précontrainte d'une paroi en béton moulée sur place sans accès en face inférieure du radier ou support recevant la paroi.Floating anchors are particularly used in the case of tie rods used to reinforce a solid mass. It then only accesses a front face of the massif in which is penetrated a reinforcing cable. Another application case is that of the prestressing of a concrete wall molded in place without access to the lower face of the raft or support receiving the wall.

Le brevet français n° 693 873 décrit un système d'ancrage noyé pour un câble à fils parallèles, comprenant une cavité dans laquelle on engage les extrémités des fils du câble en faisant s'écarter mutuellement ces fils, puis on injecte du ciment pour sceller le tout. Chaque fil individuel soumis à des efforts de traction est maintenu dans la cavité essentiellement par adhérence longitudinale, ce qui peut être insuffisant. Pour obtenir un écartement suffisant des fils du câble, on a en outre besoin d'aménager une cavité de longueur importante. Cela limite les applications de ce système d'ancrage, notamment lorsqu'on n'a pas une place suffisante pour former une longue cavité eu égard au type d'ouvrage, à la configuration du terrain avoisinant, etc.French Patent No. 693,873 discloses an embedded anchoring system for a parallel-wire cable, comprising a cavity in which the ends of the wires of the cable are engaged by mutually separating these wires, and then cement is injected to seal the whole. Each individual wire subjected to tensile stresses is maintained in the cavity essentially by longitudinal adhesion, which may be insufficient. To obtain a sufficient spacing of the cable son, it is also necessary to arrange a cavity of significant length. This limits the applications of this anchoring system, especially when there is not enough room to form a long cavity with respect to the type of structure, the configuration of the surrounding terrain, etc.

Un ancrage noyé plus court est décrit dans le brevet européen n° 0 935 034 . Pour utiliser cet ancrage, chaque armature du câble doit être munie d'une pièce d'extrémité de forme spéciale, adaptée pour que l'armature puisse être poussée jusqu'au fond de la cavité malgré la présence d'autres armatures déjà introduites. Les armatures sont introduites une par une de façon à ce qu'elles viennent trouver leurs places au fond de la cavité. La mise en oeuvre d'un tel procédé d'ancrage est longue et délicate.A shorter embedded embedment is described in European Patent No. 0 935 034 . To use this anchoring, each armature of the cable must be provided with a special shaped end piece, adapted so that the armature can be pushed to the bottom of the cavity despite the presence of other reinforcement already introduced. The frames are introduced one by one so that they come to find their places at the bottom of the cavity. The implementation of such an anchoring process is long and delicate.

Il existe donc un besoin pour un système d'ancrage noyé de mise en oeuvre simplifiée et pouvant être d'encombrement longitudinal réduit.There is therefore a need for an embedded anchoring system of simplified implementation and can be of reduced longitudinal dimensions.

Il est proposé un câble de structure, comprenant:

  • des armatures sollicitées en traction, possédant chacune une extrémité pourvue d'une partie élargie;
  • une cavité aménagée dans un ouvrage équipé du câble de structure, la cavité ayant une ouverture et au moins une portion de section plus grande que l'ouverture transversalement à une direction longitudinale de la cavité et un fond à l'opposé de l'ouverture suivant la direction longitudinale, lesdites extrémités des armatures étant logées dans la cavité de telle façon que les parties élargies des extrémités des armatures soient réparties en plusieurs couches et éventuellement décalées suivant la direction longitudinale de la cavité; et
  • un matériau de scellement dont est remplie la cavité contenant les extrémités des armatures.
It is proposed a structure cable, comprising:
  • reinforcements stressed in tension, each having an end provided with an enlarged part;
  • a cavity formed in a structure equipped with the structure cable, the cavity having an opening and at least a section portion greater than the opening transversely to a longitudinal direction of the cavity and a bottom opposite the next opening the longitudinal direction, said ends of the armatures being housed in the cavity such that the widened portions of the ends of the armatures are distributed in several layers and possibly offset in the longitudinal direction of the cavity; and
  • a sealing material which is filled the cavity containing the ends of the reinforcements.

Les armatures peuvent être engagées toutes ensemble, ou par groupes, ce qui permet d'aller assez vite tout en maîtrisant bien la répartition des armatures avec leurs parties élargies à l'intérieur de la cavité. La répartition en plusieurs couches permet avantageusement de limiter l'encombrement transversal du faisceau d'armatures lorsqu'il est introduit à travers le conduit jusqu'à la cavité.The frames can be engaged together or in groups, which allows to go quickly enough while controlling the distribution of the reinforcements with their enlarged parts inside the cavity. The distribution in several layers advantageously limits the transverse bulk of the bundle of reinforcement when it is introduced through the conduit to the cavity.

Dans un mode de réalisation, le câble de structure comprend en outre au moins un organe écarteur faisant saillie dans un fond de la cavité situé à l'opposé de l'ouverture suivant la direction longitudinale, pour que les armatures s'épanouissent à l'intérieur de la cavité. L'organe écarteur sépare les extrémités des armatures au fond de la cavité, ce qui assure leur épanouissement et permet un ancrage ferme du câble avec la masse du matériau de scellement injecté dans la cavité.In one embodiment, the structural cable further comprises at least one spacer member protruding into a bottom of the cavity located opposite the opening in the longitudinal direction, so that the reinforcements bloom at the inside the cavity. The spacer member separates the ends reinforcements at the bottom of the cavity, which ensures their development and allows a firm anchoring of the cable with the mass of the sealing material injected into the cavity.

L'organe écarteur est par exemple de forme générale conique et/ou sphérique. Il peut être monté sur une tige fixée au fond de la cavité ou directement sur la paroi de fond.The spacer member is for example of generally conical and / or spherical shape. It can be mounted on a rod fixed to the bottom of the cavity or directly on the bottom wall.

Les parties élargies des extrémités des armatures peuvent présenter un épaulement formant butée en direction de l'ouverture de la cavité. Cet épaulement permet au matériau de scellement durci d'opposer une force de réaction élevée aux armatures soumises à des forces de traction.The enlarged portions of the ends of the armatures may have a shoulder forming a stop in the direction of the opening of the cavity. This shoulder allows the hardened sealing material to oppose a high reaction force to the reinforcement subjected to tensile forces.

Un autre aspect de la présente invention se rapporte à un ouvrage de construction, comportant au moins un câble de structure tel que défini ci-dessus.Another aspect of the present invention relates to a construction structure, comprising at least one structural cable as defined above.

Un autre aspect encore de la présente invention se rapporte à un procédé d'ancrage d'un câble de structure comprenant des armatures possédant chacune une extrémité pourvue d'une partie élargie. Le procédé comprend les étapes suivantes:

  • aménager une cavité dans un ouvrage, la cavité ayant une ouverture et au moins une portion de section plus grande que l'ouverture transversalement à une direction longitudinale de la cavité;
  • un conduit de passage des armatures raccordé à la cavité
  • introduire les armatures du câble de structure dans le conduit suivant la direction longitudinale en faisant passer les parties élargies à travers l'ouverture de la cavité; et
  • remplir la cavité d'ancrage d'un matériau de scellement.
Still another aspect of the present invention relates to a method of anchoring a structural cable comprising reinforcements each having an end provided with an enlarged portion. The method comprises the following steps:
  • providing a cavity in a structure, the cavity having an opening and at least a section portion larger than the opening transversely to a longitudinal direction of the cavity;
  • a passage of the reinforcement connected to the cavity
  • introducing the reinforcements of the structural cable into the conduit in the longitudinal direction by passing the enlarged portions through the opening of the cavity; and
  • fill the anchoring cavity with a sealing material.

Selon l'invention, l'introduction des armatures dans le conduit (et la cavité) est effectuée en au moins un groupe de plusieurs armatures, les armatures de chaque groupe étant introduites ensemble dans la cavité. Dans un cas particulier, les armatures sont toutes introduites en un seul groupe dans la cavité.According to the invention, the reinforcement is introduced into the duct (and the cavity) in at least one group of several reinforcements, the reinforcements of each group being introduced together into the cavity. In a particular case, the armatures are all introduced in a single group in the cavity.

D'autres particularités et avantages de la présente invention apparaîtront dans la description ci-après d'un exemple de réalisation non limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue de côté d'une armature de précontrainte dont une extrémité est pourvue d'une partie élargie;
  • la figure 2 est une vue de côté d'un faisceau de telles armatures;
  • la figure 3 est une vue en coupe axiale d'une pièce servant à former une cavité d'ancrage;
  • la figure 4 est une vue en coupe axiale de la pièce de la figure 3 installée dans un ouvrage en béton;
  • les figures 5 et 6 sont des vues analogues à celle de la figure 4 après introduction des armatures et après scellement de celles-ci dans la cavité; et
  • les figures 7 à 10 sont des vues analogues à celles des figures 3 à 6, illustrant un autre mode de réalisation de l'invention.
Other features and advantages of the present invention will become apparent in the following description of a nonlimiting exemplary embodiment, with reference to FIGS. attached drawings, in which:
  • the figure 1 is a side view of a prestressing frame, one end of which is provided with an enlarged part;
  • the figure 2 is a side view of a bundle of such frames;
  • the figure 3 is an axial sectional view of a part for forming an anchoring cavity;
  • the figure 4 is an axial sectional view of the room of the figure 3 installed in a concrete structure;
  • the Figures 5 and 6 are views similar to that of the figure 4 after introduction of the reinforcements and after sealing thereof in the cavity; and
  • the Figures 7 to 10 are views similar to those of Figures 3 to 6 , illustrating another embodiment of the invention.

La figure 1 illustre un exemple d'armature pour mise en oeuvre de l'invention. L'armature 1, consiste dans cet exemple en un toron formé de sept fils métalliques, dont une extrémité 2 est pourvue d'une partie élargie 3. Comme illustré sur la figure 2, des armatures de ce type peuvent être assemblées parallèlement les unes aux autres pour former un faisceau 4 qui, une fois ancré sur un ouvrage de construction, constituera un câble de structure.The figure 1 illustrates an example of reinforcement for implementing the invention. The armature 1 consists in this example of a strand formed of seven metal wires, one end 2 of which is provided with an enlarged part 3. As illustrated in FIG. figure 2 reinforcements of this type may be assembled parallel to each other to form a beam 4 which, once anchored on a construction work, will constitute a structural cable.

La partie élargie 3 peut être réalisée par traitement mécanique directement sur l'extrémité 2 de l'armature si le matériau et la constitution de cette armature le permettent. Elle peut aussi être constituée d'une pièce d'extrémité solidement fixée sur l'extrémité de l'armature 1, par exemple par sertissage à chaud ou froid, soudure, collage, boulonnage, etc. Dans l'exemple représenté sur les figures 1 et 2, la pièce d'extrémité 3 est en forme générale de manchon cylindrique, avec un épaulement 3' formant une butée vers la partie active du câble de structure, c'est-à-dire la partie ou les armatures travaillent en traction (vers le côté avant de l'ancrage), et un autre épaulement 3" sur le côté opposé. Les butées formées par ces épaulements 3', 3" sont des surfaces sensiblement perpendiculaires à la direction longitudinale X des armatures 1.The enlarged portion 3 may be made by mechanical treatment directly on the end 2 of the frame if the material and the constitution of this frame allow. It may also consist of an end piece firmly fixed to the end of the frame 1, for example by hot or cold crimping, welding, bonding, bolting, etc. In the example shown on the Figures 1 and 2 , the end piece 3 is in the general shape of a cylindrical sleeve, with a shoulder 3 'forming a stop towards the active part of the structural cable, that is to say the part or the armatures work in tension (towards the front side of the anchor), and another shoulder 3 "on the opposite side The stops formed by these shoulders 3 ', 3" are surfaces substantially perpendicular to the longitudinal direction X of the reinforcements 1.

Afin de limiter l'encombrement de l'extrémité du câble et faciliter ainsi son introduction dans une cavité d'ancrage, les parties élargies 3 des armatures 1 peuvent être réparties en plusieurs couches décalées suivant la direction longitudinale X. Dans l'exemple représenté sur la figure 2, elles sont réparties en trois couches. Cette répartition en couches minimisant la section transversale totale du faisceau d'armatures 4 est facilitée par la forme cylindrique des manchons formant les parties élargies 3.In order to limit the size of the end of the cable and thus facilitate its introduction into an anchoring cavity, the enlarged portions 3 of the reinforcements 1 can be distributed in several layers offset along the longitudinal direction X. In the example shown in FIG. figure 2 they are divided into three layers. This layer distribution minimizing the total cross section of the reinforcement bundle 4 is facilitated by the cylindrical shape of the sleeves forming the enlarged parts 3.

La figure 3 montre un exemple de pièce 6 utilisable pour former une cavité d'ancrage 8 dans un ouvrage en béton. Elle peut se composer d'une tromplaque (une pièce de diffusion de l'effort), du même genre que celles utilisées couramment dans les ancrages de câbles de précontrainte, dont le volume interne de forme générale tronconique autour d'un axe de symétrie Y définit la cavité d'ancrage 8. Cette cavité 8 présente une ouverture 9 sur son côté de plus petite section sur laquelle est raccordé le conduit de précontrainte (gaine ou tube). Sur le côté opposé, de section la plus large, elle est fermée par une plaque de fond 10 fixée à la surface de la pièce 6. Cette pièce 6 peut présenter des nervures radiales ou hélicoïdales 11 qui amélioreront son maintien dans le béton environnant et le transfert des efforts entre le câble et la structure. La paroi ou le fond 10 de la pièce 6 peut présenter d'autre part un ou plusieurs conduits d'injection 12 qui pourront servir à remplir la cavité 8 avec un produit de scellement, par exemple un coulis de ciment, mortier ou résine.The figure 3 shows an example of part 6 used to form an anchoring cavity 8 in a concrete structure. It may consist of a tromplaque (a diffusion part of the force), of the same kind as those commonly used in pretensioning cable anchors, whose internal volume of generally frustoconical shape around an axis of symmetry Y defines the anchoring cavity 8. This cavity 8 has an opening 9 on its side of smaller section on which is connected the prestressing duct (sheath or tube). On the opposite side, of widest section, it is closed by a bottom plate 10 fixed to the surface of the part 6. This piece 6 may have radial or helical ribs 11 which will improve its retention in the surrounding concrete and the transfer of forces between the cable and the structure. The wall or the bottom 10 of the part 6 may furthermore have one or more injection conduits 12 which may serve to fill the cavity 8 with a sealant, for example a grout of cement, mortar or resin.

La figure 4 montre la pièce 6 après son installation dans l'ouvrage en béton. Le béton a été coulé en totalité (autour du conduit, de la pièce 6 et derrière la plaque de fond 10), de telle sorte que la cavité d'ancrage 8 n'est pas accessible sauf depuis l'extrémité opposée au travers du conduit (comme pour un câble classique de précontrainte) et jusqu'à l'ouverture 9 formée sur son côté de plus petite section.The figure 4 shows piece 6 after its installation in the concrete structure. The concrete has been poured completely (around the duct, the part 6 and behind the bottom plate 10), so that the anchoring cavity 8 is not accessible except from the opposite end through the conduit (as for a conventional prestressing cable) and up to the opening 9 formed on its smaller section side.

La gaine ou conduit de précontrainte 5 est raccordée à l'ouverture 9 de la cavité 8. Cette gaine 5 contiendra le faisceau d'armatures 4 du câble de précontrainte (voir figures 5 et 6). À titre d'exemple, la pièce 6 peut être noyée dans le radier d'un ouvrage en béton, tandis que la gaine de précontrainte 5 est noyée dans la paroi en béton qui se dresse au-dessus du radier. Dans cet exemple, la gaine de précontrainte 5 et la pièce 6 sont montées avec leur axe longitudinal Y parallèle à une direction verticale. Avant de couler le béton, on prend le soin de mettre en place un tube d'injection 13 qu'on raccorde au conduit d'injection 12 prévu dans la pièce 6, en laissant ce tube 13 accessible depuis l'extérieur une fois le béton coulé. Dans un autre exemple, le tube d'injection 13 est disposé à l'intérieur du conduit en même temps que l'introduction des armatures. Dans ce cas, le conduit 12 sur la pièce est préalablement bouché.The sheath or preloading duct 5 is connected to the opening 9 of the cavity 8. This sheath 5 will contain the bundle of reinforcements 4 of the prestressing cable (see FIG. Figures 5 and 6 ). For example, the part 6 can be embedded in the raft of a concrete structure, while the prestressing sheath 5 is embedded in the concrete wall that stands above the raft. In this example, the prestressing sheath 5 and the part 6 are mounted with their longitudinal axis Y parallel to a vertical direction. Before casting the concrete, care is taken to set up an injection tube 13 which is connected to the injection conduit 12 provided in the part 6, leaving the tube 13 accessible from the outside once the concrete sank. In another example, the injection tube 13 is disposed inside the duct at the same time as the introduction of the reinforcements. In this case, the conduit 12 on the part is previously plugged.

Après installation du conduit 5 et de la pièce 6 dans l'ouvrage en béton, on pourra procéder à l'introduction du faisceau d'armatures 4 après bétonnage. Ce faisceau d'armatures 4 est introduit depuis le conduit 5 dans la cavité 8 suivant la direction longitudinale Y en faisant passer les parties élargies 3 à travers l'ouverture 9 jusqu'à ce que le câble atteigne sensiblement le fond 10 de la cavité interne d'ancrage 8. Cette étape est illustrée par la figure 5. On voit que la disposition préconisée pour les parties élargies 3 situées aux extrémités des armatures 1 permet d'introduire ces armatures de façon collective à travers l'ouverture 9. Ceci permet une installation relativement rapide du câble de précontrainte tout en maîtrisant la répartition géométrique des armatures 1 à l'intérieur de la cavité 8.After installation of the conduit 5 and the part 6 in the concrete structure, we can proceed to the introduction of the bundle of reinforcements 4 after concreting. This bundle of reinforcements 4 is introduced from the conduit 5 into the cavity 8 in the longitudinal direction Y by passing the enlarged portions 3 through the opening 9 until the cable substantially reaches the bottom 10 of the internal cavity 8. This step is illustrated by the figure 5 . It can be seen that the arrangement recommended for the enlarged parts 3 situated at the ends of the reinforcements 1 makes it possible to introduce these reinforcements collectively through the opening 9. This allows a relatively rapid installation of the prestressing cable while controlling the geometric distribution of the elements. reinforcement 1 inside the cavity 8.

Dans une variante du procédé, le radier est bétonné en premier, l'ouverture 9 de la cavité d'ancrage restant accessible sur la face supérieure de ce radier. Dans une deuxième étape, le faisceau d'armatures 4 est amené, entouré par la gaine La partie inférieure du faisceau d'armatures 4 est engagée dans la cavité 8 à travers l'ouverture 9, puis la gaine 5 est raccordée à l'ouverture 9. Ensuite, la gaine 5 est positionnée dans le moule où on vient réaliser le bétonnage de la paroi à précontraindre.In a variant of the method, the raft is concreted first, the opening 9 of the anchoring cavity remaining accessible on the upper face of this raft. In a second step, the bundle of reinforcements 4 is brought, surrounded by the sheath The lower part of the bundle of reinforcements 4 is engaged in the cavity 8 through the opening 9, then the sheath 5 is connected to the opening 9. Next, the sheath 5 is positioned in the mold where the concreting of the wall to be prestressed is carried out.

L'étape suivante du procédé (figure 6) consiste à remplir la cavité 8 avec un matériau de scellement injecté :

  • Soit par l'intermédiaire du tube d'injection 13 prévu dans le béton du radier et du conduit d'injection 12 formé dans la paroi de la pièce 6.
  • Soit par un tube suivant le conduit du câble jusqu'à l'ancrage actif
  • Soit par un tube installé dans le conduit du câble, par exemple mis dans le faisceau d'armatures avant son enfilage (introduction du câble dans le conduit).
The next step of the process ( figure 6 ) consists in filling the cavity 8 with an injected sealing material:
  • Either through the injection tube 13 provided in the concrete of the raft and the injection duct 12 formed in the wall of the part 6.
  • Either through a tube following the cable duct to the active anchorage
  • Either by a tube installed in the conduit of the cable, for example put in the bundle of reinforcement before its threading (introduction of cable in the conduit).

D'une manière générale, le produit de scellement est limité en hauteur comme illustré sur la figure 6, par exemple jusqu'à l'ouverture 9, afin de permettre de disposer de la longueur libre pour la mise en tension ultérieure du câble de structure. La longueur libre étant ensuite injectée d'un produit de remplissage et de protection contre la corrosion. En cas d'utilisation des torons (armatures) individuellement gainés et coulissants, le produit de scellement peut couvrir la totalité de la longueur du câble étant donné que sur la partie limitée au scellement les armatures sont dénudées et nettoyées pour permettre leur adhérence lors de la mise en tension ultérieure du câble de structure comme dans le cas général.In general, the sealant is limited in height as illustrated on the figure 6 , for example up to the opening 9, to allow to have the free length for the subsequent tensioning of the structural cable. The free length is then injected with a filler and protection against corrosion. When using individually wrapped and sliding strands (reinforcements), the sealant may cover the entire length of the cable as the reinforcement is stripped and cleaned on the seal-limited part to allow adhesion during subsequent tensioning of the structural cable as in the general case.

Une fois que le produit de scellement a durci, on peut tendre le câble de structure de façon classique, en le tirant à son extrémité opposée à celle ancrée dans la cavité 8. L'effort de traction sur une armature 1 au niveau de l'ancrage est transmis à la masse de produit de scellement durci par l'intermédiaire de l'épaulement 3' de sa partie élargie 3, qui forme une butée en direction de l'ouverture 9 de la cavité. Compte tenu de la section, supérieure à celle de l'ouverture 9, que présente cette masse de produit de scellement durci 15, l'effort de traction du câble est diffusé au béton de structure via la pièce 6. Une fois que le câble de structure est tendu, le conduit 5 au dessus de la hauteur limitée est ensuite injecté d'un produit de remplissage ou de scellement.Once the sealant has hardened, the structural cable can be tensioned in a conventional manner, by pulling it at its end opposite to that anchored in the cavity 8. The tensile force on a reinforcement 1 at the level of the anchoring is transmitted to the cured sealant mass through the shoulder 3 'of its enlarged portion 3, which forms a stop in the direction of the opening 9 of the cavity. Taking into account the section, greater than that of the opening 9, that this mass of cured sealant 15 presents, the tensile force of the cable is diffused to the structural concrete via the part 6. Once the cable of The structure is stretched, the duct 5 above the limited height is then injected with a filler or sealant.

Comme indiqué précédemment, la forme de la cavité interne d'ancrage 8 a au moins une portion de section plus grande que l'ouverture 9 transversalement à une direction longitudinale Y. Pour favoriser davantage encore l'adhérence du câble avec le produit de scellement, il peut être utile d'épanouir le faisceau d'armatures 4 à l'intérieur de la cavité 8. Une possibilité pour le faire est d'avoir recours à la variante de réalisation illustrée par les figures 7 à 10.As indicated above, the shape of the internal anchoring cavity 8 has at least a portion of larger section than the opening 9 transversely to a longitudinal direction Y. To further promote the adhesion of the cable with the sealant, it may be useful to open the bundle of reinforcements 4 inside the cavity 8. One possibility for doing so is to use the variant embodiment illustrated by the Figures 7 to 10 .

Dans cette variante, la pièce 6 définissant la cavité d'ancrage 8 est modifiée pour comporter un organe écarteur 16 faisant saillie dans ladite cavité. Dans l'exemple représenté sur les figures 7 à 10, il y a un organe écarteur 16 au fond de la cavité 8, monté sur l'axe Y. Cet organe 16 positionné dans la cavité 8 est fixé au centre de la plaque de fond 10 fermant la cavité 8 à l'opposé de son ouverture 9.In this variant, the part 6 defining the anchoring cavity 8 is modified to include a spacer member 16 projecting into said cavity. In the example shown on the Figures 7 to 10 there is a spacer member 16 at the bottom of the cavity 8 mounted on the Y axis. This member 16 positioned in the cavity 8 is fixed in the center of the bottom plate 10 closing the cavity 8 opposite its opening 9.

Lors de l'introduction du faisceau d'armatures 4 (figure 9), l'organe 16 dévie les armatures 1 pour qu'elles s'épanouissent à l'intérieur de la cavité 8. Il en résulte un ancrage plus ferme du câble après injection et durcissement du produit de scellement 15, par exemple le coulis de ciment, mortier ou résine, (figure 10). Dans la variante représenté sur les figures 9-10, le faisceau 4 est composé des torons individuellement gainés et coulissants 17. Afin de faciliter la présentation, les armatures 1 du faisceau 4 sont illustrées au nombre de trois.When introducing the rebar bundle 4 ( figure 9 ), the member 16 deflects the frames 1 so that they bloom inside the cavity 8. This results in a firmer anchoring of the cable after injection and hardening of the sealant 15, for example the grout of cement, mortar or resin, ( figure 10 ). In the variant shown on the Figures 9-10 , beam 4 is composed of individually wrapped strands and sliding 17. In order to facilitate the presentation, the armatures 1 of the beam 4 are illustrated in number of three.

L'organe écarteur 16 a une portion supérieure 14 dirigée vers l'ouverture 9 de la cavité d'ancrage 8. Cette portion supérieure 14 peut avoir une forme sphérique et/ou conique pour faciliter l'écartement des armatures du faisceau. L'organe écarteur 16 peut être en une seule pièce sphérique ou conique, ou monté en haut d'une tige fixée au centre du fond de la cavité d'ancrage, comme illustré dans les figures 7-10. Il peut aussi être positionné plus haut en direction de l'ouverture 9.The spacer member 16 has an upper portion 14 directed towards the opening 9 of the anchoring cavity 8. This upper portion 14 may have a spherical and / or conical shape to facilitate the spacing of the reinforcements of the beam. The spacer member 16 may be in one spherical or conical piece, or mounted on top of a rod fixed in the center of the bottom of the anchoring cavity, as illustrated in FIGS. Figures 7-10 . It can also be positioned higher towards the opening 9.

Il est également possible de prévoir plusieurs organes écarteurs 16 répartis sur le fond 10 ou le long de la cavité d'ancrage 8 afin de subdiviser et épanouir davantage encore les extrémités 2 des armatures du faisceau.It is also possible to provide several spacing members 16 distributed on the bottom 10 or along the anchoring cavity 8 to further subdivide and expand the ends 2 of the reinforcements of the beam.

Une fois que les armatures 1 du faisceau 4 sont bien réparties dans la cavité 8, on peut remplir la cavité 8 et le conduit 5 par le produit de scellement en une seule fois. Ce remplissage est fait suivant la flèche F comme illustré dans la figure 9, via le ou les tubes d'injection 13 disposé à l'intérieur du conduit 5 en même temps que l'introduction des armatures. Le produit de scellement couvre l'ensemble du faisceau (depuis le fond de la pièce 6 jusqu'à l'extrémité supérieure des torons gainés coulissants). Après durcissement, on peut mettre en tension le câble de structure comme présenté précédemment.Once the armatures 1 of the beam 4 are well distributed in the cavity 8, the cavity 8 and the pipe 5 can be filled with the sealant at one time. This filling is done according to the arrow F as illustrated in the figure 9 , via the injection tube or tubes 13 disposed inside the conduit 5 at the same time as the introduction of the reinforcements. The sealant covers the entire bundle (from the bottom of the workpiece 6 to the upper end of the sliding sheathed strands). After curing, the structure cable can be tensioned as previously described.

Quel que soit le mode de réalisation adopté, on obtient finalement et de manière efficace un ancrage noyé de longueur relativement courte et on bénéficie en outre d'une introduction en une seule fois de l'ensemble du câble dans la cavité d'ancrage 8.Whatever the embodiment adopted, a drilled anchor of relatively short length is finally and effectively obtained, and the whole of the cable is also introduced into the anchoring cavity 8 in one go.

Dans une variante de réalisation du procédé, on garde une introduction collective des armatures à l'intérieur de la cavité d'ancrage 8, mais cette introduction est réalisée successivement en plusieurs groupes et non plus un seul. Dans ce cas, chaque groupe, ou sous-faisceau, d'armatures est assemblé, en prévoyant la répartition spatiale des parties élargies 3 à leurs extrémités (figure 2), avant d'être introduit dans la cavité. Cette façon de procéder amène quelques étapes supplémentaires dans la réalisation de l'ancrage, mais elle permet éventuellement de réduire la section de l'ouverture 9, ce qui peut faire améliorer la robustesse de l'ancrage en fonction de sa configuration.In an alternative embodiment of the method, a collective introduction of the reinforcements is kept inside the anchoring cavity 8, but this introduction is successively carried out in several groups and not only one. In that case, each group, or sub-beam, of reinforcements is assembled, by providing the spatial distribution of the enlarged portions 3 at their ends ( figure 2 ), before being introduced into the cavity. This procedure leads to a few additional steps in the implementation of the anchoring, but it may reduce the section of the opening 9, which can improve the robustness of the anchor according to its configuration.

Naturellement, la présente invention est sujette à de nombreuses variantes quant à sa mise en oeuvre. Bien que quelques modes de réalisation aient été décrits, on comprend bien qu'il n'est pas concevable d'identifier de manière exhaustive tous les modes possibles. Ces modes de réalisation décrits sont de simples illustrations de la présente invention. Diverses modifications peuvent leur être apportées sans sortir du cadre de l'invention qui ressort des revendications annexées.Naturally, the present invention is subject to many variations as to its implementation. Although some embodiments have been described, it is well understood that it is not conceivable to exhaustively identify all the possible modes. These described embodiments are merely illustrations of the present invention. Various modifications can be made without departing from the scope of the invention which emerges from the appended claims.

Claims (12)

Câble de structure, comprenant: - des armatures (1) sollicitées en traction, possédant chacune une extrémité (2) pourvue d'une partie élargie (3); - une cavité (8) aménagée dans un ouvrage équipé du câble de structure, la cavité ayant une ouverture (9) et au moins une portion de section plus grande que l'ouverture transversalement à une direction longitudinale (Y) de la cavité et un fond à l'opposé de l'ouverture suivant la direction longitudinale, lesdites extrémités des armatures étant logées dans la cavité; et - un matériau de scellement (15) dont est remplie la cavité contenant les
extrémités des armatures,
caractérisé en ce que les parties élargies (3) des extrémités (2) des armatures (1) sont réparties en plusieurs couches décalées suivant la direction longitudinale (Y) de la cavité (8). Structure cable, comprising: - tensile stressed armatures (1), each having an end (2) provided with an enlarged portion (3); a cavity (8) arranged in a structure equipped with the structure cable, the cavity having an opening (9) and at least a section portion larger than the opening transversely to a longitudinal direction (Y) of the cavity and a bottom opposite the opening in the longitudinal direction, said ends of the armatures being housed in the cavity; and - a sealing material (15) which is filled the cavity containing the
ends of the frames,
characterized in that the widened portions (3) of the ends (2) of the reinforcements (1) are distributed in several layers offset in the longitudinal direction (Y) of the cavity (8). Câble de structure selon la revendication 1, comprenant en outre: au moins un organe écarteur (16) faisant saillie dans la cavité situé à l'opposé de l'ouverture (9) suivant la direction longitudinale (Y), pour que les armatures s'épanouissent à l'intérieur de la cavité.The structural cable according to claim 1, further comprising: at least one spacer member (16) projecting into the cavity opposite the opening (9) in the longitudinal direction (Y), so that the reinforcements flourish inside the cavity. Câble de structure selon la revendication 2, dans lequel l'organe écarteur (16) est fixé au fond de la cavité (8).Structural cable according to claim 2, wherein the spacer member (16) is fixed to the bottom of the cavity (8). Câble de structure selon l'une quelconque des revendications précédentes, dans lequel les parties élargies (3) des extrémités (2) des armatures (1) présentent un épaulement (3') formant butée en direction de l'ouverture (9) de la cavité (8).Structural cable according to any one of the preceding claims, wherein the widened portions (3) of the ends (2) of the armatures (1) have a shoulder (3 ') forming a stop in the direction of the opening (9) of the cavity (8). Câble de structure selon l'une quelconque des revendications précédentes, dans lequel les parties élargies (3) des extrémités (2) des armatures (1) sont en forme générale de manchon cylindrique.Structural cable according to any one of the preceding claims, wherein the widened portions (3) of the ends (2) of the reinforcements (1) are in the general shape of a cylindrical sleeve. Ouvrage de construction, comportant au moins un câble de structure selon l'une quelconque des revendications précédentes.Construction structure, comprising at least one structural cable according to any one of the preceding claims. Procédé d'ancrage d'un câble de structure comprenant des armatures (1) possédant chacune une extrémité (2) pourvue d'une partie élargie (3), le procédé comprenant les étapes suivantes: - aménager une cavité (8) dans un ouvrage, la cavité ayant une ouverture (9) et au moins une portion de section plus grande que l'ouverture transversalement à une direction longitudinale (Y) de la cavité; - introduire les armatures du câble de structure dans la cavité suivant la direction longitudinale en faisant passer les parties élargies à travers l'ouverture; et - remplir la cavité d'ancrage (8) d'un matériau de scellement (15), caractérisé en ce que l'introduction des armatures dans la cavité est effectuée en au moins un groupe de plusieurs armatures, les armatures de chaque groupe étant introduites ensemble dans la cavité. A method of anchoring a structural cable comprising reinforcements (1) each having an end (2) provided with an enlarged portion (3), the method comprising the steps of: - Fit a cavity (8) in a structure, the cavity having an opening (9) and at least a section portion greater than the opening transversely to a longitudinal direction (Y) of the cavity; - introducing the reinforcements of the structural cable into the cavity in the longitudinal direction by passing the enlarged parts through the opening; and - Filling the anchoring cavity (8) with a sealing material (15), characterized in that the introduction of the reinforcements into the cavity is performed in at least one group of several frames, the reinforcements of each group being introduced together in the cavity. Procédé selon la revendication 7, dans lequel les armatures (1) sont toutes introduites en un seul groupe dans la cavité (8).The method of claim 7, wherein the reinforcements (1) are all introduced in a single group into the cavity (8). Procédé selon la revendication 7 ou 8, comprenant en outre: - une répartition des parties élargies (3) des extrémités (2) des armatures (1) en plusieurs couches décalées suivant la direction longitudinale (Y) avant d'introduire les armatures dans la cavité (8). The method of claim 7 or 8, further comprising: - A distribution of the widened portions (3) of the ends (2) of the armatures (1) in several layers offset in the longitudinal direction (Y) before introducing the armatures in the cavity (8). Procédé selon l'une quelconque des revendications 7 à 9, comprenant en outre: - un épanouissement des armatures (1) lors de leur introduction dans la cavité (8) en les faisant dévier par au moins un organe écarteur (16) faisant saillie dans la cavité situé dans la zone entre l'ouverture (9) et le fond suivant la direction longitudinale (Y). The method of any of claims 7 to 9, further comprising: a development of the reinforcements (1) when they are introduced into the cavity (8) by deflecting them by at least one spacer member (16) protrusion in the cavity located in the area between the opening (9) and the bottom in the longitudinal direction (Y). Procédé selon l'une quelconque des revendications 7 à 10, dans lequel les parties élargies (3) des extrémités (2) des armatures (1) présentent un épaulement (3') formant butée en direction de l'ouverture (9) de la cavité (8) une fois les armatures introduites.Method according to any one of claims 7 to 10, wherein the widened portions (3) of the ends (2) of the armatures (1) have a shoulder (3 ') forming a stop in the direction of the opening (9) of the cavity (8) once the reinforcements are introduced. Procédé selon l'une quelconque des revendications 7 à 11, dans lequel les parties élargies (3) des extrémités (2) des armatures (1) sont en forme générale de manchon cylindrique.Method according to any one of claims 7 to 11, wherein the enlarged portions (3) of the ends (2) of the frames (1) are generally cylindrical sleeve shape.
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DE3002024A1 (en) * 1980-01-21 1981-07-23 Siempelkamp Gießerei GmbH & Co, 4150 Krefeld Concrete prestressing tension members anchorage - involves anchors and spacers for separate core cluster and surrounding ring clusters
US4484425A (en) * 1982-07-21 1984-11-27 Figg And Muller Engineers, Inc. Anchorage of cables
US5289626A (en) * 1989-03-27 1994-03-01 Kajima Corporation Foundation anchor and method for securing same to a foundation
EP0935034A1 (en) 1998-02-09 1999-08-11 VSL International AG Method of manufacturing of an anchoring, anchoring piece and tensioning element for this purpose

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR693873A (en) 1929-04-24 1930-11-26 Improvements made to public works structures, in particular to those, such as dams, comprising massive building materials
DE1609722B1 (en) * 1966-12-07 1971-06-24 Leonhardt Fritz Prof Dr Ing Potting compound for the anchoring of tension members and methods of insertion
DE3002024A1 (en) * 1980-01-21 1981-07-23 Siempelkamp Gießerei GmbH & Co, 4150 Krefeld Concrete prestressing tension members anchorage - involves anchors and spacers for separate core cluster and surrounding ring clusters
US4484425A (en) * 1982-07-21 1984-11-27 Figg And Muller Engineers, Inc. Anchorage of cables
US5289626A (en) * 1989-03-27 1994-03-01 Kajima Corporation Foundation anchor and method for securing same to a foundation
EP0935034A1 (en) 1998-02-09 1999-08-11 VSL International AG Method of manufacturing of an anchoring, anchoring piece and tensioning element for this purpose

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114922063A (en) * 2022-05-20 2022-08-19 兰州理工大学 Suspension bridge tunnel type anchorage

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FR2982890B1 (en) 2014-01-03
FR2982890A1 (en) 2013-05-24
ES2623921T3 (en) 2017-07-12
DK2594700T3 (en) 2017-05-22

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