EP3317471B1 - Ensemble d'ancrage pour une structure, structure en béton comprenant un tel ensemble, et procédé de fabrication d'une telle structure en béton - Google Patents

Ensemble d'ancrage pour une structure, structure en béton comprenant un tel ensemble, et procédé de fabrication d'une telle structure en béton Download PDF

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EP3317471B1
EP3317471B1 EP16738224.1A EP16738224A EP3317471B1 EP 3317471 B1 EP3317471 B1 EP 3317471B1 EP 16738224 A EP16738224 A EP 16738224A EP 3317471 B1 EP3317471 B1 EP 3317471B1
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Prior art keywords
tubular member
strands
tendon
anchor head
concrete
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German (de)
English (en)
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EP3317471A1 (fr
Inventor
Ka Wai Alice LIN
Yau Chun YIP
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VSL International Ltd
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VSL International Ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
    • 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 concerns an anchorage assembly for a concrete structure, a concrete structure with such an assembly, and a manufacturing method of such a concrete structure.
  • tendons In concrete structure with pre-stressed strands, there exists several types of tendons, divided into bonded or unbonded tendons. Generally the tendons are made of individual steel elements that are placed in the structure at a first stage and stressed to a certain force at a later stage.
  • one or more strands are inserted into a metal or plastic channel that is embedded in the concrete.
  • the strand(s) is(are) stressed with a mono or multi-strand jack and anchored in a common anchorage device.
  • the channel is then filled with a cementitious grout that provides corrosion protection to the strand(s) and bonds the tendon to the concrete surrounding the channel.
  • Bonded systems are more commonly used in bridges for the roadway, the piles, the foundation and in building. In buildings, they are typically used in heavily loaded beams such as transfer girders and landscaped plaza decks.
  • An unbonded tendon is one in which the prestressing steel is not actually bonded to the concrete that surrounds it except at the anchorages.
  • the two most common unbonded systems are first monostrand tendons and secondly bare strands surrounded by grease.
  • the monostrands are used in slabs and beams for buildings, parking structures and-on-ground, in bridge for external post-tensioning and in several type of a suspended structure with cable stay.
  • a monostrand consists of several steel wires that are coated with a corrosion-inhibiting soft product and encased in an extruded plastic protective sheathing made of plastic material.
  • the tendon can be made of one monostrand (for slab) up to several monostrands (external post-tensioning ,cable stays), In some case the monostrand(s) is (are) directly embedded in the concrete; in another case they may be installed in a channel.
  • the second type of unbonded tendon consists in one to several bare strands that are installed in a channel made of steel or plastic, the channel being embedded in a concrete structure or following a specific layout within a structure.
  • the void is filled with a corrosion-inhibiting soft product allowing the strand to move with respect to the channel and to the structure.
  • the bare strands consist of several steel wires assembled together.
  • the soft products are made of grease or wax.
  • the anchorage consists of an iron casting and a conical, two-piece or three-piece wedge which grips individually from 1 to 6 or 7 strands.
  • an anchor block with two-piece or three-piece wedges, which grips as many strands as necessary.
  • Such anchor block bears on a cast iron piece or steel manufactured part that is embedded in a structure.
  • the channel is generally made of plastic or steel tubes when located outside a structure between several deviation point, and the channel is generally made of corrugated ducts in steel or plastic when embedded in a structure.
  • EP0566463 presents such an unbonded system with monostrands, in a modified embodiment where the strands of the tendon are embedded directly in the concrete block forming the concrete structure or in a channel filled with a hardening filler such as cement grout before the strands are stressed.
  • the advantage of such unbonded system is that the steel wires inside the monostrand are protected from any corrosion by the soft filler contained in the plastic sheath. Also the sheath allows to carry out the installation of the strands much in advance during the construction period, reducing therefore the total time of construction with a high level of protection.
  • EP1227200 and KR100966457 concerns anchorage assemblies where a first part of individual strands of a tendon pass through individual perforation of an anchor head, a second part of the tendon is placed in a tubular member with the tendon passing in an opening formed in a bearing plate adjacent to the anchor head, and a removable locking system allows to fix the strands in the anchorage.
  • the present invention also aims to provide an alternative solution to the known solution which facilitates inspection and re-stressing of the tendons.
  • an anchorage assembly for a structure comprising a tendon made of strands, the anchorage assembly defining at least two parts:
  • the de-tensioning of the tendon can be implemented while the anchor head has entered within the first tubular member, after removal of the locking system.
  • Fig.1 a situation where the tendon 10 is mounted through an anchorage assembly 20 placed partially within a structure 42, and comprising in a linear arrangement a channel 43, a second tubular member 22, a first tubular member 24 and a bearing plate 26.
  • the second tubular member 22 is placed within the structure 42 at a distance from the front face 40 of the structure, in a direction orthogonal to the front face 40.
  • the inner diameter of the second tubular member 22 allows the introduction of the tendon 10.
  • the inner diameter of the second tubular member 22 is D1.
  • outlet means the extremity of any elongated element turned towards the outside of the front face 40 of the structure 42 or the structure 42 (on the left on the figures 1 to 6 ).
  • inlet means the extremity of any elongated element turned opposite to the front face 40 or (on the right on the figures 1 to 6 ).
  • the first tubular member 24 extends the second tubular member 22 in a coaxial manner to the first tubular member 22, in the direction of the orthogonal to the front face 40.
  • a first tubular member 24 is usually formed by a trumpet shape elongated member, named as a "trumpet".
  • the inlet of the first tubular member 24 is connected in a water-sealed manner to the outlet of the second tubular member 22.
  • the inner diameter of the first tubular member 24 also allows the introduction of the tendon 10. Generally the inner diameter of the first tubular member 24 is larger than the inner diameter of the second tubular member 22.
  • At least the inner diameter D2 of the first tubular member 24 at the inlet side is larger than the inner diameter of the second tubular member 22 D1 at the outlet side, namely D2 > D1.
  • the bearing plate 26 is placed at the front face 40 of the structure 42, with a large opening 27 adjacent to the outlet of the first tubular member 24 (see Fig.1 ), having an inner diameter D4 close to D3.
  • an injection pipe 23 is mounted so as to have fluid communication between the inner space of the second tubular member 22 and the outside of the formwork forming the front face 40 of the structure 42.
  • a temporary sealing block 28 having an outer diameter close to D2 but slightly less, is threaded from outside the anchorage assembly 20, into the bearing plate 26 and the first tubular member 24 up to the inlet of the first tubular member 22 onto an abutment plate 41 with an opening.
  • Such a temporary sealing block 28 forms a thick plate having as much holes as strands 12 and is first placed with the tendon passing through, each strand 12 in a corresponding hole of said temporary sealing block 28, before engagement of the temporary sealing block 28 through the opening 27 of the bearing plate 26.
  • the sealing block 28 is made of a sealing pad locked between a pressing pad and a pressing plate.
  • WO2011116828 presents a possible embodiment for such a sealing block 28.
  • the tendon 10 is composed of one or a plurality of sheathed and greased strands 12 with sheath 14 within the structure 42 up to the outlet face defined by the abutment plate 41.
  • the strand(s) is (are) individually wrapped in a outer (Plastic) sheath 14 with interposition of corrosion preventive compound such as grease or wax, which means the metallic strand can slide with respect to the sheath forming the envelope 14 of each strand 12, the corrosion preventive compound forming also a lubricant.
  • the preferred thickness of the sheaths 14 is between 1 and 2 mm, a value over 1.5 mm is recommended when the tendon length is over 100 m long of the installation condition are difficult with the tendon deviation having high deviation (over 100 °).
  • the invention is not limited to such preferred type of strands 12 and can apply also to other types of strands, such as bare metallic strands (not illustrated) : in such a case, the second tubular member 22 is not to be filed in with cement matrix but with a non-hardening corrosion preventive compound such as wax or grease.
  • the second tubular member 22 is filled with a hardening filler by injection of a hardening matrix through the injection pipe 23 into the second tubular member 22 so as to fill in all the interstices between the outer sheath 14 and the second tubular member 22, and between all pairs of adjacent sheathed strands 12.
  • a hardening matrix By the setting or hardening of the cement matrix 23a, each strand 12 is locked in a direction perpendicular to the front face of the anchorage 40 by its sheath 14 to the second tubular member 22.
  • the temporary sealing block 28 is un-tight and removed.
  • an anchor head 30 and a removable locking system 32 are provided.
  • the anchor head 30 is formed by a thick metallic block having as much holes as strands 12. According to an important feature, the anchor head 30 has an outside diameter D5 smaller than said opening (diameter D4) of the bearing plate 26 (see Fig. 3 ). Also, the outer end of the second tubular member 22 has a diameter D1 smaller than the outer diameter D5 of the anchor head 30. Also, the anchor head 30 has an outside diameter D5 smaller than said inner diameter D3 and D2 of the first tubular member 24 at the outlet side.
  • the removable locking system 32 comprises at least one split shim; in Fig.1 two superposed split shims are used, having both an outer diameter larger than the diameter D4 of the opening of the bearing plate 26.
  • the removable locking system 32 comprises a nut able to cooperate with a threaded portion of the outer face of the anchor head 30, with the outer diameter of the nut larger than the diameter D4 of the opening of the bearing plate 26.
  • the removable locking system 32 allows for the reversible locking of the anchor head 30 outside the first tubular member 24 (for tensioning or re-tensioning the tendon 10) and, by unlocking, letting the anchor head 30 circulating in the first tubular member 24 (for de-tensioning the tendon 10) without removing the conical wedges 34.
  • strands 12 are sheathed along their running part up to and within said second tubular member 22, said sheath 14 being thereby able to be embedded within said filler compound (notably locked within cement matrix 23a) in said second tubular member 22, and the sheaths 14 of the said strands 12 are removed in their intermediate and end portions (unsheathed length 12a) extending within said first tubular member 24 up to their extremity outside the front face 40 (or structure 42).
  • This unsheathing operation is generally carried out just before the third step of stressing described below so that the strands are protected from the corrosion until they are unsheathed and finally stressed.
  • a stressing jack 50 is mounted and activated between the outer face of the anchor head 30 and the extremity of each individual strand 12 ( Fig.3 ).
  • blocking means such as (split) conical wedges 34 are entered into the holes of the anchor head 30, around each strand 12 to fix the stressed state of each strand 12.
  • a cap 36 is mounted in a water-tight manner onto the bearing plate 26, for accommodating said removable locking element 32, said anchor head 30 and said end portion of the tendon 10 (the extremity of the strands 12 of the end portion being unsheathed).
  • Said cap 36 is able to receive a removable protective product, namely a non-hardening corrosion preventive compound 38, such as wax or grease.
  • the anchorage assembly 20 of the present invention defines, as shown on Fig.4 , a first part C, a second part B and a third part A.
  • the third part A of the anchorage assembly 20 the strands 12 are locked by their sheath 14 with respect to the second tubular member 22, by means of the cement matrix 23a, with the possibility for the individual metallic strands to slide with respect to the corresponding sheath 14.
  • the second part B the intermediate unsheathed portion 12a of the strands 12 is protected against corrosion by the corrosion preventive compound 38 contained in the second tubular element 24 .
  • the third part A and the second part B are located within the structure 42.
  • the end portion of the unsheathed strands 12a is placed in the removable locking system 32, the anchor head 30 and in the cap 36.
  • the third part A of the anchorage assembly is omitted, namely the second tubular member 22 and the channel 43 are not present in the anchorage assembly 20.
  • said sealing block 28 and said abutment plate 41 are placed during concreting and said strands 12 are able to be directly embedded in the structure concrete 42 by their sheath 14 while allowing the metallic part of the strand to move longitudinally in the structure.
  • the strands remain locked laterally by the concrete matrix.
  • Said strands could be monostrands.
  • the strands 12 are in the normal service situation, namely after stressing and filling of the second tubular element 24 and of the cap 36 with grease or any other non-hardening corrosion preventive compound 38 which is in contact with the bare segment 12a of the strands 12.
  • this corrosion preventive compound 38 is also present in the opening 27 of the bearing plate 26 around the tendon 10, namely between all pairs of adjacent bare strands 12a, between the periphery of the opening 27 and the periphery of the tendon 10, in the opening of the removable locking system 32 and in the perforations of the anchor head 30 so as to wrap all the unsheathed portions 12a of the strands 12.
  • said first part C further comprises immobilisation pieces placed individually around a length of said unsheathed strands 12a at least partially disposed within the outlet of said perforations of the anchor head 30.
  • said immobilisation pieces are split wedges 34.
  • the pouring and setting of the concrete in the formwork is made initially after the installation of the first and second tubular members 22, 24, the abutment plate 41, the bearing 26 and the injection pipe 23.
  • These elements including the tendon 10 and the compound 23a can therefore be implanted as from the situation shown in fig.2 at any time, namely several weeks, months or years later: with its strands 12 and their sheath 14 the tendon 10 is protected against corrosion all along its length before removing the sheaths 14 and further stressing.
  • the present invention concerns a method of lifting-off of the tendon 10 equipped with the previously described anchorage assembly 20, in a structure 42, and also a method for the surveillance of the tendon in such a structure 42.
  • the structure 42 can be a structure made of concrete or steel or with both materials.
  • such a method of lifting-off a tendon 10 in a structure 42 comprises a lift-off step of at least one tendon 10 with the following sub-steps:
  • a method of surveillance of a tendon 10 in a structure comprising a strand sampling step with the following sub-steps:
  • said strand sampling step comprises further the following sub-steps (not shown):
  • the length of the first tubular element 24 serves as strand length available for de-tensioning the tendon 10.

Claims (16)

  1. Ensemble d'ancrage (20) pour une structure (42), comprenant un tendon (10) constitué de torons (12), l'ensemble d'ancrage (20) définissant au moins deux parties :
    - une première partie (C) avec les torons (12) de la partie d'extrémité du tendon (10) traversant des perforations individuelles d'une tête d'ancrage (30),
    - une deuxième partie (B) avec une partie intermédiaire du tendon (10) placée à l'intérieur d'un premier élément tubulaire (24) capable de recevoir un produit protecteur amovible (38),
    dans lequel ladite seconde partie (B) est apte à être placée à l'intérieur d'une structure (42), les torons (12) faisant passer ladite partie d'extrémité d'une part à travers une ouverture (27) formée dans une plaque de support (26) disposée dans une position adjacente à la sortie du premier élément tubulaire (24), avec ladite sortie du premier élément tubulaire (24) et ladite ouverture (27) reliées entre elles, et d'autre part dans lesdites perforations individuelles de ladite tête d'ancrage (30) qui est placée à l'extérieur de la face avant (40) de la structure (42),
    dans lequel la tête d'ancrage (30) a un diamètre extérieur (D5) inférieur au diamètre (D4) de ladite ouverture (27) de la plaque de support (26), dans lequel il comprend en outre un système de verrouillage amovible (32) interposé entre ladite tête d'ancrage (30) et ladite plaque de support (26), la présence du système de verrouillage (32) empêchant ainsi la tête d'ancrage (30) d'entrer dans ladite ouverture (27) et ladite sortie du premier élément tubulaire (24),
    caractérisé en ce que ladite plaque de support (26) est apte à être disposée à l'intérieur de la structure (42),
    et caractérisé en ce que ledit ensemble d'ancrage comprend en outre :
    - une troisième partie (A) avec la partie courante du tendon (10) placée à l'intérieur d'un second élément tubulaire (22) capable de recevoir un composé de remplissage (23a) et à l'intérieur d'un canal (43), la sortie dudit second élément tubulaire (22) étant reliée à l'entrée dudit premier élément tubulaire (24), l'entrée dudit second élément tubulaire (22) étant reliée audit canal (43), dans lequel ledit second élément tubulaire (22) et ledit canal sont aptes à être placés dans la structure (42),
    - une plaque de butée (41) formant l'entrée du premier élément tubulaire (24) et un bloc d'étanchéité (28) pouvant être placé à l'intérieur dudit premier élément tubulaire (24), adjacent à ladite plaque de butée (41), dans lequel lesdits torons (12) traversant ledit bloc d'étanchéité (28) et dans lequel ledit bloc d'étanchéité (28) est capable de rendre étanche l'espace intérieur du premier élément tubulaire (24) de l'espace intérieur du second élément tubulaire (22) pour former un joint d'étanchéité pour ledit composé de remplissage (23a).
  2. Ensemble d'ancrage (20) selon l'une quelconque de la revendication 1, dans lequel ledit système de verrouillage (32) comprend soit au moins une cale fendue soit un écrou capable de coopérer avec une partie filetée de la face extérieure de la tête d'ancrage (30).
  3. Ensemble d'ancrage (20) selon l'une quelconque des revendications 1 à 2, dans lequel ledit tendon (10) est constitué de torons gainés et graissés (12).
  4. Ensemble d'ancrage (20) selon la revendication 1, dans lequel lesdits torons (12) sont gainés le long de leur partie courante jusqu'au et dans ledit second élément tubulaire (22), ladite gaine (14) pouvant ainsi être noyée dans ledit composé de remplissage (23a) dans ledit canal (43) et dans ledit second élément tubulaire (22), et dans lequel lesdits torons (12) sont non gainés dans leurs parties intermédiaire et d'extrémité (12a) qui se prolonge dans ledit premier élément tubulaire (24) jusqu'à leur extrémité dans ladite première partie.
  5. Ensemble d'ancrage (20) selon l'une quelconque des revendications 1 à 4, dans lequel ledit composé de remplissage (23a) est une matrice de ciment, ledit toron gainé (12) pouvant ainsi être noyé dans ladite matrice de ciment.
  6. Ensemble d'ancrage (20) selon l'une quelconque des revendications 1 à 5, dans lequel ledit bloc d'étanchéité (28) et ladite plaque de butée (41) sont placés pendant le bétonnage et dans lequel lesdits torons (12) peuvent être directement noyés dans le béton de la structure.
  7. Ensemble d'ancrage (20) selon l'une quelconque des revendications 1 à 6, dans lequel l'extrémité de sortie du premier élément tubulaire (24) a un diamètre intérieur (D2) et (D3) supérieur au diamètre extérieur (D5) de la tête d'ancrage (30).
  8. Structure en béton précontrainte au moyen d'une pluralité de tendons (10) constitués de torons (12), la partie principale desdits tendons (10) étant noyée individuellement dans le béton durci formant le corps principal de la structure, ledit béton durci formant un bloc (42) résultant du coulage et de la prise dudit béton dans un coffrage qui est retiré après prise dudit béton, comprenant pour chaque tendon (10) un assemblage d'ancrage (20) définissant au moins deux parties :
    - une première partie (C) avec les torons (12) de la partie d'extrémité du tendon (10) traversant des perforations individuelles d'une tête d'ancrage (30),
    - une deuxième partie (B) avec une partie intermédiaire du tendon (10) placée dans un premier élément tubulaire (24) contenant un produit protecteur amovible (38),
    dans laquelle ladite seconde partie (B) est placée à l'intérieur de ladite structure (42), les torons (12) ayant ladite partie d'extrémité passée à travers d'une part une ouverture (27) formée dans une plaque de support (26) disposée à la face extérieure dudit bloc dans une position adjacente à la sortie du premier élément tubulaire (24), ladite sortie du premier élément tubulaire (24) et ladite ouverture (27) étant reliées entre elles et d'autre part lesdites perforations individuelles de ladite tête d'ancrage (30) qui est placée en dehors dudit bloc (42),
    dans laquelle la tête d'ancrage (30) a un diamètre extérieur (D5) inférieur au diamètre (D4) de ladite ouverture (27) de la plaque de support (26),
    dans laquelle il comprend en outre un système de verrouillage amovible (32) interposé entre ladite tête d'ancrage (30) et ladite plaque de support (26), la présence du système de verrouillage (32) empêchant ainsi la tête d'ancrage (30) d'entrer dans ladite ouverture et dans ladite sortie du premier élément tubulaire (24),
    caractérisé en ce que ledit ensemble d'ancrage comprend en outre :
    - une troisième partie (A) avec la partie courante du tendon (10) placée à l'intérieur d'un second élément tubulaire (22) capable de recevoir un composé de remplissage (23a) et à l'intérieur un canal (43), la sortie dudit second élément tubulaire (22) étant reliée à l'entrée dudit premier élément tubulaire (24), l'entrée dudit second élément tubulaire (22) étant reliée audit canal (43), dans laquelle ledit second élément tubulaire (22) et ledit canal sont placés dans la structure (42),
    - une plaque de butée (41) formant l'entrée du premier élément tubulaire (24) et un bloc d'étanchéité (28) pouvant être placé à l'intérieur dudit premier élément tubulaire (24), adjacent à ladite plaque de butée (41), dans lequel lesdits torons (12) traversant ledit bloc d'étanchéité (28) et dans lequel ledit bloc d'étanchéité (28) est capable de rendre étanche l'espace intérieur du premier élément tubulaire (24) de l'espace intérieur du second élément tubulaire (22) pour former un joint d'étanchéité pour ledit composé de remplissage (23a).
  9. Structure en béton selon la revendication 8, dans laquelle ledit tendon (10) est constitué de torons gainés et graissés (12).
  10. Structure en béton selon l'une quelconque des revendications 8 à 9, dans laquelle lesdits torons (12) sont gainés dans une première partie s'étendant le long de leur partie courante jusqu'au et dans ledit second élément tubulaire (22), ladite gaine (14) pouvant ainsi être noyée dans ledit composé de remplissage (23a) dans ledit canal (43) et dans ledit second élément tubulaire (22), et dans laquelle lesdits torons (12) sont non gainés dans une seconde partie (12a) s'étendant dans ledit premier élément tubulaire (24) jusqu'à leur extrémité.
  11. Structure en béton selon la revendication 10, dans laquelle ledit composé de remplissage (23a) est une matrice de ciment, ladite gaine pouvant ainsi être noyée dans ladite matrice de ciment dans ledit canal (43) et dans ledit second élément tubulaire (22).
  12. Structure en béton selon l'une quelconque des revendications 8 à 11, dans laquelle ledit système de verrouillage (32) comprend soit au moins une cale fendue, soit un écrou capable de coopérer avec une partie filetée de la face extérieure de la tête de fixation (30).
  13. Structure en béton selon l'une quelconque des revendications 8 à 12dans laquelle l'extrémité extérieure du premier élément tubulaire (22) a un diamètre intérieur (D3) et D2 supérieur au diamètre extérieur (D5) de la tête de fixation (30).
  14. Structure en béton selon la revendication 8, dans laquelle ledit bloc d'étanchéité (28) et ladite plaque de butée (41) sont placés pendant le bétonnage et dans laquelle lesdits torons (12) peuvent être directement noyés dans le béton de la structure.
  15. Procédé de fabrication d'une structure en béton selon l'une quelconque des revendications 8 à 14, comprenant les étapes suivantes:
    - la construction d'une structure (42) avec lesdites plaques d'appui (26) placées dans ladite structure (42) sur la face avant (40) de la structure (42),
    - relier la sortie dudit premier élément tubulaire (24) de manière étanche à l'eau à l'ouverture (27) de ladite plaque de support (26),
    - relier l'entrée dudit premier élément tubulaire (24) de manière étanche à l'eau à la sortie dudit deuxième élément tubulaire (22) avec une plaque de butée (41) formant l'entrée du premier élément tubulaire (24) et un bloc d'étanchéité (28) placé dans ledit premier élément tubulaire (24), adjacent à ladite plaque de butée (41), ,
    - fournir un tuyau d'injection (23) sortant à l'extérieur de la face avant (40) et relié au deuxième élément tubulaire (22),
    - retirer la gaine desdits torons (12) le long de leurs parties intermédiaire et terminale (12a),
    - engager une partie d'extrémité de tendon (10) à travers ledit deuxième élément tubulaire (22), ledit premier élément tubulaire (24) et ladite ouverture (27) avec l'extrémité desdits torons (12) placée au-delà de la face externe (40) de la structure (42),
    - injecter une matrice de ciment à travers le tuyau d'injection (23) dans le deuxième élément tubulaire (22) de manière à ce que tous les torons (12) soient noyés dans ladite matrice de ciment le long d'un segment de leur partie courante,
    - après le durcissement de ladite matrice de ciment, enlever ledit bloc d'étanchéité (28),-
    - engager ledit système de verrouillage et ladite tête d'ancrage (30) autour de l'extrémité de ladite partie d'extrémité du tendon (10) dans la direction de la face externe (40) de la structure (42),
    - verrouiller ledit système de verrouillage entre ladite tête d'ancrage (30) et ladite plaque de support (26), et
    - fournir un dispositif de mise en contrainte (50) sur la partie d'extrémité du tendon (10) et mettre en contrainte ledit tendon (10).
  16. Procédé de fabrication d'une structure en béton selon la revendication 15, comprenant en outre les étapes suivantes :,
    - après avoir mis en contrainte ledit tendon (10) retirer ledit système de mise en contrainte,
    - monter de manière étanche un capuchon sur la plaque de support (26), ledit capuchon recevant ledit élément de verrouillage amovible, ladite tête d'ancrage (30) et ladite partie d'extrémité du tendon (10), et
    - injecter dans ledit capuchon et dans ledit second élément tubulaire (24) ledit produit protecteur amovible (38).
EP16738224.1A 2015-07-01 2016-06-30 Ensemble d'ancrage pour une structure, structure en béton comprenant un tel ensemble, et procédé de fabrication d'une telle structure en béton Active EP3317471B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9512015 2015-07-01
PCT/IB2016/053935 WO2017002069A1 (fr) 2015-07-01 2016-06-30 Ensemble d'ancrage pour une structure, structure en béton comprenant un tel ensemble, et procédé de fabrication d'une telle structure en béton

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EP3317471A1 EP3317471A1 (fr) 2018-05-09
EP3317471B1 true EP3317471B1 (fr) 2019-10-16

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EP (1) EP3317471B1 (fr)
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Publication number Priority date Publication date Assignee Title
FR3075948B1 (fr) * 2017-12-21 2021-06-25 Electricite De France Surveillance de cable de precontrainte a torons clairs et injecte au coulis de ciment
CN110778139A (zh) * 2019-10-21 2020-02-11 上海市政工程设计研究总院（集团）有限公司 一种无粘结预应力筋混凝土板局部开洞施工方法

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Publication number Priority date Publication date Assignee Title
US3225499A (en) * 1962-07-02 1965-12-28 Jack P Kourkene Post tensioning concrete reinforcing wires
AU1752167A (en) * 1967-02-09 1968-08-15 Tensioning device for pres-stressed concrete components
DE8716677U1 (fr) * 1987-03-13 1988-02-11 Dyckerhoff & Widmann Ag, 8000 Muenchen, De
FR2690189B1 (fr) 1992-04-15 1998-11-13 Freyssinet Int & Co Perfectionnements aux ouvrages en beton precontraint a l'aide de torons gaines graisses et a leurs procedes de construction.
ES2307580T3 (es) * 2001-01-29 2008-12-01 Vsl International Ag Dispositivo y metodo para anclaje de un extremo de un tirante a una base.
DE20205149U1 (de) * 2002-04-03 2002-07-04 Dywidag Systems Int Gmbh Korrosionsgeschütztes Zugglied, insbesondere Schrägseil für eine Schrägseilbrücke
KR100966457B1 (ko) * 2009-07-24 2010-06-28 이현우 자체적인 부식방지 기능을 갖춘 언본디드 강연선과 내시경 카메라를 이용한 콘크리트 구조물 보강용 포스트텐셔닝 장치 및, 이를 이용한 콘크리트 구조물의 유지관리 방법
BR112012023677B1 (pt) 2010-03-26 2022-03-15 Vsl International Ag Disposição de vedação para um elemento de construção e elemento de construção

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EP3317471A1 (fr) 2018-05-09
WO2017002069A1 (fr) 2017-01-05

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