EP0123622B1 - Anchoring device for a prestressing cable - Google Patents

Anchoring device for a prestressing cable Download PDF

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Publication number
EP0123622B1
EP0123622B1 EP84400800A EP84400800A EP0123622B1 EP 0123622 B1 EP0123622 B1 EP 0123622B1 EP 84400800 A EP84400800 A EP 84400800A EP 84400800 A EP84400800 A EP 84400800A EP 0123622 B1 EP0123622 B1 EP 0123622B1
Authority
EP
European Patent Office
Prior art keywords
block
plate
holes
anchoring device
pierced
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.)
Expired
Application number
EP84400800A
Other languages
German (de)
French (fr)
Other versions
EP0123622A2 (en
EP0123622A3 (en
Inventor
Jean-François Nieto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Freyssinet International STUP SA
Original Assignee
Freyssinet International STUP SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Freyssinet International STUP SA filed Critical Freyssinet International STUP SA
Priority to AT84400800T priority Critical patent/ATE35011T1/en
Publication of EP0123622A2 publication Critical patent/EP0123622A2/en
Publication of EP0123622A3 publication Critical patent/EP0123622A3/en
Application granted granted Critical
Publication of EP0123622B1 publication Critical patent/EP0123622B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/39—Cord and rope holders
    • Y10T24/3907—Sheathed strand

Definitions

  • the invention relates to anchoring devices intended for prestressing cables composed of several wires or strands, devices comprising a support plate, an anchoring block pierced with frustoconical holes each traversed by a wire or strand of the cable, said block resting on the support plate, and frustoconical jaws adapted to wedge the wires or strands in the corresponding holes of the block.
  • the support plate is hollowed out by a single central opening traversed by all of the wires or strands constituting the cable (see for example the document CH-A-444 441).
  • the edge of this opening, furthest from the block, is connected by a trumpet to the end of the sheath which envelops the cable.
  • the block must then have on the one hand a relatively large thickness to resist the flexions to which it is stressed by the tension exerted on the cable, given the vacuum created by the opening of the plate, and on the other hand sufficient transverse dimensions. to be able to rest on the edge of this opening.
  • said thickness of the block is not solely determined by the dimensions of the jaws.
  • the support plate is pierced with multiple holes extending those of the block so that this plate can support this block over its entire non-pierced surface.
  • the support plate is no longer pierced with a single central opening, but with a multitude of holes, in the manner of a grid or plate "crosslinked” or gridded.
  • This arrangement makes it possible to reduce all the dimensions of the anchoring block, and in particular its thickness, and therefore its cost.
  • the conicity of the jaw receiving holes is extended axially beyond the block, in the plate itself, which allows the ends of the jaws to also penetrate into the plate, thus ensuring excellent transverse attachment of these two parts: one is thus sure of the stability over time of their relative transverse positioning.
  • the mutual adhesion between the plate and the block can be improved by subjecting appropriate finishing treatments to the facing surfaces of these two parts or by applying to at least one of these surfaces an appropriate coating.
  • the block can be welded to the plate.
  • Figure 1 of this drawing shows in axial section a cable anchoring device according to the invention.
  • Figure 2 also shows in axial section the detail of a variant of such a device also according to the invention.
  • the anchoring device shown in FIG. 1 comprises a plate 1 pierced with a multitude of cylindrical holes 1 1 suitable for extending the various frustoconical holes 2 1 hollowed out in an anchoring block 2 itself constituted by a flat block of relatively small dimensions.
  • frustoconical jaws 3 block the multiple wires or strands 4 making up the cable to be anchored.
  • the periphery of the face, of the plate 1, furthest from the block 2, is connected, by a trumpet 5 whose diameter decreases away from the plate, at the end of a sheath 6 constituting the envelope of the cable, the sections, wires or strands 4, leaving the plate 1 being guided to said end by said trumpet which surrounds them.
  • This trumpet 5 and the sheath 6 are intended to be embedded in the concrete structure 7 which it is desired to subject to prestressing by the tension of the cable.
  • the axes of the holes 1 1 and 2 1 can be divergent towards the outside of the structure 7, as is usual.
  • these axes are perpendicular to the support plane of the plate 1, that is to say parallel to the general axis of the cable: the holes which must be made in the plate 1 and in block 2 to obtain the holes 1 1 and 2 1 are then simplified.
  • the axes considered could also have a general orientation converging towards the outside of the structure 7, as shown schematically by the angle a.
  • the holes hollowed out in the plate 1 each comprise a frustoconical section 1 2 extending exactly one frustoconical hole 2 1 of the block 2 and the small base of this frustoconical section 1 2 is connected to a cylindrical section 1 3 opening on the outside of the plate on its face furthest from block 2.
  • the small diameter ends of the jaws 3 can penetrate into the frustoconical sections 1 2 , which ensures excellent transverse joining between the plate 1 and the block 2, making it impossible for them to slide relative in particular to their work in mutual bending.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Piles And Underground Anchors (AREA)
  • Ropes Or Cables (AREA)
  • Coating With Molten Metal (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention provides an anchoring device for a pre-stress cable formed from several filaments or strands (4), comprising a bearing plate (1), a block (2) pierced with truncated cone shaped holes (21) through each of which passes a filament or strand of the cable, said block resting on said plate and truncated cone shaped jaws (3) for jamming the filaments or strands in their holes. The bearing plate (1) is pierced with multiple holes (11) extending those (21) of the block (2) so that this plate supports this block over the whole of its non pierced surface.

Description

L'invention concerne les dispositifs d'ancrage destinés aux câbles de précontrainte composés de plusieurs fils ou torons, dispositifs comportant une plaque d'appui, un bloc d'ancrage percé de trous tronconiques traversés chacun par un fil ou toron du câble, ledit bloc reposant sur la plaque d'appui, et des mors tronconiques propres à coincer les fils ou torons dans les trous correspondants du bloc.The invention relates to anchoring devices intended for prestressing cables composed of several wires or strands, devices comprising a support plate, an anchoring block pierced with frustoconical holes each traversed by a wire or strand of the cable, said block resting on the support plate, and frustoconical jaws adapted to wedge the wires or strands in the corresponding holes of the block.

Dans les modes de réalisation connus de ces dispositifs, la plaque d'appui est évidée par une ouverture centrale unique traversée par la totalité des fils ou torons constitutifs du câble (voir par exemple le document CH-A-444 441 ). Le bord, de cette ouverture, le plus éloigné du bloc, est raccordé par une trompette à l'extrémité de la gaine qui enveloppe le câble.In the known embodiments of these devices, the support plate is hollowed out by a single central opening traversed by all of the wires or strands constituting the cable (see for example the document CH-A-444 441). The edge of this opening, furthest from the block, is connected by a trumpet to the end of the sheath which envelops the cable.

Le bloc doit alors présenter d'une part une épaisseur relativement grande pour résister aux flexions auxquelles il est sollicité par la tension exercée sur le câble, vu le vide créé par l'ouverture de la plaque, et d'autre part des dimensions transversales suffisantes pour pouvoir prendre appui sur le bord de cette ouverture. En particulier ladite épaisseur du bloc n'est pas uniquement déterminée par les dimensions des mors.The block must then have on the one hand a relatively large thickness to resist the flexions to which it is stressed by the tension exerted on the cable, given the vacuum created by the opening of the plate, and on the other hand sufficient transverse dimensions. to be able to rest on the edge of this opening. In particular, said thickness of the block is not solely determined by the dimensions of the jaws.

Pour remédier à ces inconvénients, conformément à l'invention, la plaque d'appui est percée de trous multiples prolongeant ceux du bloc de façon que cette plaque puisse soutenir ce bloc sur toute sa surface non percée.To overcome these drawbacks, in accordance with the invention, the support plate is pierced with multiple holes extending those of the block so that this plate can support this block over its entire non-pierced surface.

En d'autres termes, la plaque d'appui n'est plus percée d'une ouverture centrale unique, mais d'une multitude de trous, à la façon d'une grille ou plaque "réticulée" ou quadrillée.In other words, the support plate is no longer pierced with a single central opening, but with a multitude of holes, in the manner of a grid or plate "crosslinked" or gridded.

C'est alors l'ensemble de la plaque et du bloc intimement juxtaposés l'une contre l'autre qui résiste aux flexions auxquelles est sollicité le dispositif d'ancrage.It is then the assembly of the plate and of the block intimately juxtaposed one against the other which resists the flexions to which the anchoring device is stressed.

Cette disposition permet de réduire toutes les dimensions du bloc d'ancrage, et en particulier son épaisseur, et donc son coût.This arrangement makes it possible to reduce all the dimensions of the anchoring block, and in particular its thickness, and therefore its cost.

On peut bien entendu jouer sur les épaisseurs et natures respectives de la plaque et du bloc en fonction des besoins.One can of course play on the respective thicknesses and natures of the plate and the block as required.

Selon une disposition avantageuse, la conicité des trous de réception des mors est prolongée axialement au-delà du bloc, dans la plaque elle-même, ce qui permet aux extrémités des mors de pénétrer également dans la plaque, assurant ainsi une excellente solidarisation transversale de ces deux pièces : on est sûr ainsi de la stabilité dans le temps de leur positionnement transversal relatif.According to an advantageous arrangement, the conicity of the jaw receiving holes is extended axially beyond the block, in the plate itself, which allows the ends of the jaws to also penetrate into the plate, thus ensuring excellent transverse attachment of these two parts: one is thus sure of the stability over time of their relative transverse positioning.

Dans le même but on peut améliorer l'adhérence mutuelle entre la plaque et le bloc en faisant subir des traitements de finition appropriés aux surfaces en regard de ces deux pièces ou en appliquant sur l'une au moins de ces surfaces un revêtement approprié.For the same purpose, the mutual adhesion between the plate and the block can be improved by subjecting appropriate finishing treatments to the facing surfaces of these two parts or by applying to at least one of these surfaces an appropriate coating.

Selon une variante, on peut souder le bloc sur la plaque.Alternatively, the block can be welded to the plate.

Le dessin montre à titre purement illustratif deux modes de réalisation de l'invention.The drawing shows purely by way of illustration two embodiments of the invention.

La figure 1, de ce dessin, montre en coupe axiale un dispositif d'ancrage de câble conforme à l'invention.Figure 1 of this drawing shows in axial section a cable anchoring device according to the invention.

La figure 2 montre également en coupe axiale le détail d'une variante d'un tel dispositif également conforme à l'invention.Figure 2 also shows in axial section the detail of a variant of such a device also according to the invention.

Le dispositif d'ancrage représenté sur la figure 1 comprend une plaque 1 percée d'une multitude de trous cylindriques 11 propres à prolonger les différents trous tronconiques 21 évidés dans un bloc d'ancrage 2 lui-même constitué par un pavé plat de dimensions relativement petites.The anchoring device shown in FIG. 1 comprises a plate 1 pierced with a multitude of cylindrical holes 1 1 suitable for extending the various frustoconical holes 2 1 hollowed out in an anchoring block 2 itself constituted by a flat block of relatively small dimensions.

C'est dans les trous 21 que des mors tronconiques 3 bloquent les fils ou torons multiples 4 composant le câble à ancrer.It is in the holes 2 1 that frustoconical jaws 3 block the multiple wires or strands 4 making up the cable to be anchored.

La périphérie de la face, de la plaque 1, la plus éloignée du bloc 2, est raccordée, par une trompette 5 dont le diamètre diminue en s'éloignant de la plaque, à l'extrémité d'une gaine 6 constituant l'enveloppe du câble, les tronçons, des fils ou torons 4, sortant de la plaque 1 étant guidés jusqu' à ladite extrémité par ladite trompette qui les entoure. Cette trompette 5 et la gaine 6 sont destinées à être noyées dans l'ouvrage en béton 7 que l'on désire soumettre à la précontrainte par la tension du câble.The periphery of the face, of the plate 1, furthest from the block 2, is connected, by a trumpet 5 whose diameter decreases away from the plate, at the end of a sheath 6 constituting the envelope of the cable, the sections, wires or strands 4, leaving the plate 1 being guided to said end by said trumpet which surrounds them. This trumpet 5 and the sheath 6 are intended to be embedded in the concrete structure 7 which it is desired to subject to prestressing by the tension of the cable.

C'est alors sur cet ouvrage 7 que prend appui la périphérie de la plaque d'appui 1.It is then on this structure 7 that the periphery of the support plate 1 is supported.

Les axes des trous 11 et 21 peuvent être divergents vers l'extérieur de l'ouvrage 7, comme il est habituel.The axes of the holes 1 1 and 2 1 can be divergent towards the outside of the structure 7, as is usual.

Mais dans le mode de réalisation préféré illustré, ces axes sont perpendiculaires au plan d'appui de la plaque 1, c'est-à-dire parallèles à l'axe général du câble : les perçages qui doivent être pratiqués dans la plaque 1 et dans le bloc 2 pour obtenir les trous 11 et 21 sont alors simplifiés.But in the preferred embodiment illustrated, these axes are perpendicular to the support plane of the plate 1, that is to say parallel to the general axis of the cable: the holes which must be made in the plate 1 and in block 2 to obtain the holes 1 1 and 2 1 are then simplified.

Les axes considérés pourraient également présenter une orientation générale convergente vers l'extérieur de l'ouvrage 7, comme schématisé par l'angle a.The axes considered could also have a general orientation converging towards the outside of the structure 7, as shown schematically by the angle a.

Dans la variante de la figure 2, les trous évidés dans la plaque 1 comprennent chacun un tronçon tronconique 12 prolongeant exactement un trou tronconique 21 du bloc 2 et la petite base de ce tronçon tronconique 12 est raccordée à un tronçon cylindrique 13 débouchant à l'extérieur de la plaque sur sa face la plus éloignée du bloc 2.In the variant of FIG. 2, the holes hollowed out in the plate 1 each comprise a frustoconical section 1 2 extending exactly one frustoconical hole 2 1 of the block 2 and the small base of this frustoconical section 1 2 is connected to a cylindrical section 1 3 opening on the outside of the plate on its face furthest from block 2.

Avec une telle variante, les extrémités de petit diamètre des mors 3 peuvent pénétrer dans les tronçons tronconiques 12, ce qui assure une excellente solidarisation transversale entre la plaque 1 et le bloc 2, rendant impossible leur glissement relatif à l'occasion notamment de leur travail en flexion mutuel.With such a variant, the small diameter ends of the jaws 3 can penetrate into the frustoconical sections 1 2 , which ensures excellent transverse joining between the plate 1 and the block 2, making it impossible for them to slide relative in particular to their work in mutual bending.

Claims (5)

1. Anchoring device for a pre-stress cable formed of several filaments or strands (4), comprising a bearing plate (1), a block (2) pierced with truncated cone shaped holes (21) through each of which passes a filament or strand of the cable, said block resting on said plate, and truncated cone shaped jaws (3) for jamming the filaments or strands in their holes, characterized in that the bearing plate (1) is pierced with multiple holes (11,12,13) extending those (21) of the block (2) so that this plate supports this block over the whole of its non pierced surface.
2. Anchoring device according to claim 1, characterized in that the conical shape of the holes receiving the jaws is extended axially beyond the block (2), into the plate (1) itself (at 12).
3. Anchoring device according to any one of claims 1 and 2, characterized in that one at least of the mutual bearing surfaces of the plate (1) and of the block (2) is treated or coated so as to improve its adherence against the facing surface.
4. Anchoring device according to any one of the preceding claims, characterized in that the plate (1) is welded on the block (2).
5. Anchoring device according to any one of the preceding claims, characterized in that the axes of the holes and bores formed in the plate (1) and in the block (2) are parallel to the general direction of the cable.
EP84400800A 1983-04-22 1984-04-19 Anchoring device for a prestressing cable Expired EP0123622B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400800T ATE35011T1 (en) 1983-04-22 1984-04-19 DEVICE FOR ANCHORING A PRE-STRESS CABLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR8302084 1983-04-22
BR8302084A BR8302084A (en) 1983-04-22 1983-04-22 ASSEMBLY FOR TENSOR MEMBERS

Publications (3)

Publication Number Publication Date
EP0123622A2 EP0123622A2 (en) 1984-10-31
EP0123622A3 EP0123622A3 (en) 1985-08-28
EP0123622B1 true EP0123622B1 (en) 1988-06-08

Family

ID=4033101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400800A Expired EP0123622B1 (en) 1983-04-22 1984-04-19 Anchoring device for a prestressing cable

Country Status (8)

Country Link
US (1) US4558547A (en)
EP (1) EP0123622B1 (en)
JP (1) JPS6084909A (en)
AT (1) ATE35011T1 (en)
BR (1) BR8302084A (en)
DE (1) DE3471965D1 (en)
ES (1) ES532162A0 (en)
FR (1) FR2544769B1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663975B1 (en) * 1990-06-29 1993-07-09 Freyssinet Int Stup IMPROVEMENTS ON BRIDGE BRIDGES AND MORE ESPECIALLY THEIR PYLONES AND BRIDGES.
US5596854A (en) * 1994-01-19 1997-01-28 Vsl International Ag Post-tensioning anchor head assembly
DE19539748A1 (en) * 1995-10-26 1997-04-30 Dyckerhoff & Widmann Ag Stressed concrete structural part
US20040159058A1 (en) * 2003-02-19 2004-08-19 Jacques Gulbenkian Unbonded post-tensioning system
US7941554B2 (en) * 2003-08-01 2011-05-10 Microsoft Corporation Sparse caching for streaming media
US7597505B2 (en) * 2006-03-28 2009-10-06 Price Herbert S Roof bolt plate
CN110034525A (en) * 2019-03-28 2019-07-19 合肥工业大学 Pressure vessel sensor extraction wire sealing device and method
CN111485679A (en) * 2020-05-07 2020-08-04 吴立新 Steel stranded wire connector for flat anchor and use method

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
GB647378A (en) * 1948-09-03 1950-12-13 Dowsett Engineering Constructi Method and apparatus for use in the manufacture of reinforced concrete
DE969806C (en) * 1952-11-26 1958-07-17 Hochtief Ag Hoch Tiefbauten Method for wedging tensioned wire bundles in the manufacture of prestressed concrete
US3060639A (en) * 1958-12-05 1962-10-30 Prescon Corp Prestressing apparatus
US3226934A (en) * 1961-05-16 1966-01-04 C I M Consultants Ltd Rock bolts
CH444441A (en) * 1965-09-16 1967-09-30 Losinger Ag Device for tensioning and anchoring several tendons that together form a tensioning cable
DE6938088U (en) * 1969-09-29 1970-01-02 Ilseder Huette STRESS STEEL ANCHORING
CH534786A (en) * 1971-10-21 1973-03-15 Brandestini Antonio Device for tensioning and anchoring wires or strands
JPS5321749Y2 (en) * 1972-01-17 1978-06-07
GB1478308A (en) * 1973-08-23 1977-06-29 Ccl Systems Ltd Anchorage assembly for use in the prestressing of concrete structures
JPS532313U (en) * 1976-06-22 1978-01-11
JPS5321752U (en) * 1976-07-30 1978-02-23

Also Published As

Publication number Publication date
JPS6084909A (en) 1985-05-14
DE3471965D1 (en) 1988-07-14
ATE35011T1 (en) 1988-06-15
FR2544769B1 (en) 1986-12-26
ES8502196A1 (en) 1985-01-01
EP0123622A2 (en) 1984-10-31
FR2544769A1 (en) 1984-10-26
US4558547A (en) 1985-12-17
BR8302084A (en) 1984-11-20
EP0123622A3 (en) 1985-08-28
ES532162A0 (en) 1985-01-01

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