EP0122197A2 - Anchoring devices for lubricated prestressing reinforcements - Google Patents

Anchoring devices for lubricated prestressing reinforcements Download PDF

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Publication number
EP0122197A2
EP0122197A2 EP84400676A EP84400676A EP0122197A2 EP 0122197 A2 EP0122197 A2 EP 0122197A2 EP 84400676 A EP84400676 A EP 84400676A EP 84400676 A EP84400676 A EP 84400676A EP 0122197 A2 EP0122197 A2 EP 0122197A2
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EP
European Patent Office
Prior art keywords
cover
face
anchoring device
skirt
bowl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84400676A
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German (de)
French (fr)
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EP0122197A3 (en
Inventor
Daniel Thomarat
Bernard Amelot
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Freyssinet International STUP SA
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Freyssinet International STUP SA
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Publication date
Application filed by Freyssinet International STUP SA filed Critical Freyssinet International STUP SA
Publication of EP0122197A2 publication Critical patent/EP0122197A2/en
Publication of EP0122197A3 publication Critical patent/EP0122197A3/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to anchoring devices intended to retain the ends of reinforcement under tension and. intended to ensure the prestressing of concrete elements: these reinforcements being contained in sheaths filled with grease and preferably being constituted by a strand.
  • the larger diameter end of said housing, the smaller diameter end of this housing being itself tightly connected to the corresponding end of the sheath, in particular by means of a plastic funnel.
  • the cover is a part having a high mechanical resistance, generally made of metal, the base of which is screwed with the interposition of an annular seal on a complementary threaded collar of the plate.
  • the invention aims, above all, to overcome these drawbacks.
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • the frame considered here intended to subject a concrete element or structure 1 to prestress by being tensioned between its two ends, is constituted by a strand 2 itself composed of wires 3 (FIG. 2) wound around a central wire 4 of slightly larger diameter.
  • this strand is itself enveloped by a sheath 5 made of plastic, for example polyethylene, and the volumes between this sheath and the constituent wires of the strand are filled with grease.
  • Such a cladding and such a lubrication have the double advantage of making possible the relative sliding of the frame relative to the sheath, after pouring the concrete around the latter, which facilitates the tensioning of said frame, and of protecting this reinforcement against corrosion, caused in particular by the action of humidity.
  • the anchoring device intended to retain one of the ends of the strand 2 comprises a metal plate 6, in particular. made of cast iron, thickened in its center and pierced in this center by a frustoconical housing 7.
  • This housing 7 is suitable for receiving the reinforcement end in question surrounded by a set of three jaws 8 forming a ring split longitudinally at 9: each of these jaws extends substantially over 120 ° around the axis common to the strand 2 and the housing 7 and has a cylindrical inner face adapted to match the strand and a frustoconical outer face complementary to the housing.
  • the edge of the mouth of small diameter of the frustoconical housing 7, or more precisely that of a cylindrical flange 10 axially extending this mouth, is connected in a relatively sealed manner to the end of the sheath 5 -: which sheath is interrupted by below the end of the frame 2 to allow the grips of the jaws 8 on this frame - by a suitable funnel 11 made of plastic material, a cylindrical end of which is force fitted onto said flange.
  • a notch 20 interrupts one of the three ribs 18 at an angle of the order of 30 °.
  • a cover 21 made of a slightly deformable plastic material such as polypropylene, molded, in particular by injection.
  • the terminal thinning in question corresponds to a removal of the thickness of the skirt inside of it and not outside.
  • the thickness of this thinned edge 25 is advantageously between 0.4 and 0.6 mm.
  • Each locking pin. 27 is here delimited laterally by two plane faces 29 parallel to the axis of the assembly and externally by a projecting dihedral at an acute angle comprising, on the side of the top of the cover, a plane face 30 perpendicular to this axis. and, on the other side, a face 31 slightly inclined on said axis.
  • the inclination in question is substantially equal to that of the frustoconical face 16 of the bowl.
  • each lug 27 is less than that of the intervals 19.
  • the axial distance between the transverse faces 30 of said lugs and the end edge of the skirt 24 is substantially equal to the axial distance between the flat bottom of the bowl 12 and the face of each rib 18, facing this bottom.
  • the coding lug 28 was in the form of a prismatic pad of generatrices parallel to the axis of the assembly and of semi-circular or rectangular director.
  • This lug is provided so as to be able to penetrate axially into the notch 20 and to come into angular abutment against the angular ends of this notch in order to determine the limit switches of the assembly.
  • Two ears 32 molded with the cover protrude from its neck 23 and facilitate manual control of its angular movements.
  • the thinned edge 25 of the skirt 24 comes into contact with the curved surface 14 of the bottom of the bowl.
  • the cover is then rotated in the screwing direction., Which angularly penetrates the pins 27 in the grooves in an arc defined between the ribs 18 and the frustoconical surface 16 of the bowl.
  • the cover 21 is then fixed in an extremely solid and rigorously tight manner on the bowl 12.
  • This device has clear advantages over those previously known, in particular as regards the low price and the simplicity of the assembly, which no longer requires the use of a seal.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sealing Devices (AREA)
  • Adornments (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

An anchoring device for a lubricated prestressing reinforcement (2) contained in a sheath (5), which reinforcement is held by a frustoconical jaw crown (8) in a housing (7) which is itself made in a plate (6). The mouth of largest diameter of the housing forms the centre of a dish (12) whose inner lateral face has a curved base (14) and ribs in an arc of a circle (18), and this dish is closed by a cap (21) in plastic material having a cylindrical skirt (24) with a thinned edge (25) capable of interacting with the curved base (14), the outer face of this skirt comprising locking studs (27) capable of interacting, as a bayonet fitting, with the grooves (18), and a correction and stop stud (28). <IMAGE>

Description

L'invention concerne les dispositifs d'ancrage destinés à retenir les extrémités d'armatures mises sous tension et. destinées à assurer la précontrainte d'éléments en béton: ces armatures étant contenues dans des gaines remplies de graisse et étant de préférence constituées par un toron.The invention relates to anchoring devices intended to retain the ends of reinforcement under tension and. intended to ensure the prestressing of concrete elements: these reinforcements being contained in sheaths filled with grease and preferably being constituted by a strand.

Elle concerne plus particulièrement, parmi ces dispositifs ceux qui comprennent d'une part une plaque rigide de répartition évidée par un logement tronconique propre à recevoir jointivement l'extrémité d'armature à retenir entourée d'une couronne tronconique de mors, et d'autre part un capot propre à recouvrir et à fermer d'une façon étanche à.` la graisse l'extrémité de plus grand diamètre dudit logement, l'extrémité de plus petit diamètre de ce logement étant elle-même reliée de façon étanche à l'extrémité correspondante de la gaine, notamment par l'intermédiaire d'un entonnoir en matière plastique.It relates more particularly, among these devices, those which comprise on the one hand a rigid distribution plate hollowed out by a frustoconical housing suitable for receiving the end of the reinforcement to be joined contiguously surrounded by a frustoconical crown of jaws, and on the other share a clean cover to cover and close in a grease tight manner. the larger diameter end of said housing, the smaller diameter end of this housing being itself tightly connected to the corresponding end of the sheath, in particular by means of a plastic funnel.

Dans les modes de réalisation connus de ces dispositifs d'ancrage, le capot est une pièce présentant une grande résistance mécanique, généralement constituée en métal, dont la base est vissée avéc interposition d'un joint d'étanchéité annulaire sur une collerette filetée complémentaire solidaire de la plaque.In the known embodiments of these anchoring devices, the cover is a part having a high mechanical resistance, generally made of metal, the base of which is screwed with the interposition of an annular seal on a complementary threaded collar of the plate.

L'ensemble de ce capot et de ce joint est relativement coûteux et leur mise en place est fastidieuse.The assembly of this cover and of this seal is relatively expensive and their installation is tedious.

L'invention a pour but, surtout, d'écarter ces inconvénients.The invention aims, above all, to overcome these drawbacks.

A cet effet, les dispositifs d'ancrage du genre en question selon l'invention sont essentiellement caractérisés :

  • - en ce que leur capot est constitué par une cloche en matière plastique légèrement déformable présentant une jupe cylindrique à bord aminci qui porte sur sa face extérieure au moins deux ergots de verrouillage,
  • - et en ce que la portion de leur plaque propre à recevoir le capot présente la forme d'une cuvette de révolution dont le fond de la face latérale interne présente une forme tronconique ou analogue propre à coagir avec le bord aminci de la jupe ci-dessus de manière à assurer une application mutuelle étanche entre ce fond et ce bord, ladite face pore tant des nervures en arc de cercle propres à coagir avec les ergots ci-dessus de façon à assurer un verrouillage à balon- nette du capot sur la cuvette.
To this end, the anchoring devices of the type in question according to the invention are essentially characterized:
  • - in that their cover is constituted by a slightly deformable plastic bell having a cylindrical skirt with a thinned edge which carries on its outer face at least two locking lugs,
  • - And in that the portion of their own plate for receiving the cover has the shape of a bowl of revolution, the bottom of the internal lateral face has a frustoconical shape or the like capable of interacting with the thinned edge of the skirt below. above so as to ensure a sealed mutual application between this bottom and this edge, said face pores so many ribs in an arc of a circle suitable for interacting with the above lugs so as to ensure a balloon locking of the cover on the bowl .

Dans des modes de réalisation préférés, on a recours en outre à l'une et/ou à l'autre des dispositions suivantes :

  • - la face extérieure de la jupe porte au moins un ergot de détrompage et d'arrêt angulaire propre à coagir avec une encoche évidée dans l'une des nervures,
  • - chaque ergot de verrouillage est délimité latéralement par deux faces planes parallèles et extérieurement par un dièdre saillant à angle aigu dont la face disposée du côté du sommet du capot est perpendiculaire à l'axe de ce capot et dont l'autre face est légèrement inclinée sur cet axe, et la face latérale interne de la cuvette comprend une portée tronconique propre à coagir jointivement avec ladite face légèrement inclinée,
  • - deux oreilles venues de moulage avec le capot sont prévues sur la face extérieure du fond de ce capot,
  • - le fond du capot comprend un disque central plan et un col tronconique raccordant ce disque à la jupe,
  • - le fond du capot est évidé d'au moins un trou pour l'introduction de graisse et est solidarisé par l'intermédiaire d'une patte flexible avec un bouchon propre à obturer ce trou, l'ensemble de cette patte et de ce bouchon étant venu de moulage par injection avec le capot.
In preferred embodiments, use is also made of one and / or the other of the following arrangements:
  • the outer face of the skirt carries at least one key for angular locking and angular stop capable of interacting with a notch hollowed out in one of the ribs,
  • each locking lug is delimited laterally by two parallel flat faces and externally by a projecting dihedral at an acute angle, the face disposed on the side of the top of the cover is perpendicular to the axis of this cover and the other face of which is slightly inclined on this axis, and the internal lateral face of the bowl comprises a frustoconical bearing suitable for coactively joining with said slightly inclined face,
  • - two ears molded with the cover are provided on the outer face of the bottom of this cover,
  • the bottom of the cover comprises a flat central disc and a frustoconical collar connecting this disc to the skirt,
  • - The bottom of the hood is hollowed out with at least one hole for the introduction of grease and is secured by means of a flexible tab with a plug suitable for closing this hole, all of this tab and this plug having come injection molding with the cover.

L'invention comprend, mises à part ces dispositions principales, certaines autres dispositions qui s'utilisent de préférence en même temps et dont il sera plus explicitement question ci-après.The invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.

Dans ce qui suit, l'on va décrire un mode de réalisation préféré de l'invention en se référant aux. dessins ci-annexés d'une manière bien entendu non limitative.

  • La figure 1, de ces dessins, montre en coupe axiale un dispositif d'ancrage établi selon l'invention avec son capot coupé selon I-I, figure 2.
  • La figure 2 est une coupe transversale de la figure 1 selon II-II.
  • La figure 3 montre en vue en bout l'ensemble de la plaque comprise par le dispositif d'ancrage ci-dessus et du capot monté sur cette plaque.
  • La figure 4 montre ledit capot seul en vue perspective.
In the following, a preferred embodiment of the invention will be described with reference to. attached drawings of course in a nonlimiting manner.
  • FIG. 1, of these drawings, shows in axial section an anchoring device established according to the invention with its cover cut according to II, FIG. 2.
  • Figure 2 is a cross section of Figure 1 along II-II.
  • Figure 3 shows in end view the entire plate included by the above anchoring device and the cover mounted on this plate.
  • Figure 4 shows said cover alone in perspective view.

L'armature ici considérée, destinée à soumettre à une précontrainte un élément ou ouvrage 1 en béton en étant mise sous tension entre ses deux extrémités, est constituée par un toron 2 lui-même composé de fils 3 (figure 2) enroulés autour d'un fil central 4 de diamètre un peu plus gros.The frame considered here, intended to subject a concrete element or structure 1 to prestress by being tensioned between its two ends, is constituted by a strand 2 itself composed of wires 3 (FIG. 2) wound around a central wire 4 of slightly larger diameter.

D'une façon connue en soi, ce toron est lui-même enveloppé par une gaine 5 en matière.plastique, par exemple en polyéthylène, et les volumes compris entre cette gaine et les fils constitutifs du toron sont remplis de graisse.In a manner known per se, this strand is itself enveloped by a sheath 5 made of plastic, for example polyethylene, and the volumes between this sheath and the constituent wires of the strand are filled with grease.

Un tel gainage et un tel graissage présentent le double avantage de rendre possibles les coulissements relatifs de l'armature par rapport à la gaine, après coulée du béton autour de cette dernière, ce qui facilite la mise sous tension de ladite armature, et de protéger cette armature contre la corrosion, provoquée en particulier par l'action de l'humidité.Such a cladding and such a lubrication have the double advantage of making possible the relative sliding of the frame relative to the sheath, after pouring the concrete around the latter, which facilitates the tensioning of said frame, and of protecting this reinforcement against corrosion, caused in particular by the action of humidity.

Le dispositif d'ancrage destiné à retenir l'une des extrémités du toron 2 comporte une plaque métallique 6, notam-. ment en fonte, épaissie en son centre et percée en ce centre par un logement tronconique 7.The anchoring device intended to retain one of the ends of the strand 2 comprises a metal plate 6, in particular. made of cast iron, thickened in its center and pierced in this center by a frustoconical housing 7.

Ce logement 7 est propre à recevoir jointivement l'extrémité d'armature considérée entourée d'un jeu de trois mors 8 formant une bague fendue longitudinalement en 9 : chacun de ces mors s'étend sensiblement sur 120° autour de l'axe commun au toron 2 et au logement 7 et présente une face intérieure cylindrique propre à épouser le toron et une face extérieure tronconique'complémentaire du logement.This housing 7 is suitable for receiving the reinforcement end in question surrounded by a set of three jaws 8 forming a ring split longitudinally at 9: each of these jaws extends substantially over 120 ° around the axis common to the strand 2 and the housing 7 and has a cylindrical inner face adapted to match the strand and a frustoconical outer face complementary to the housing.

Le bord de l'embouchure de petit diamètre du logement tronconique 7, ou plus précisément celui d'une collerette cylindrique 10 prolongeant axialement cette embouchure, est raccordé de façon relativement étanche à l'extrémité de la gaine 5 -:laquelle gaine est interrompue en deçà de l'extrémité de l'armature 2 pour permettre la prise des mors 8 sur cette armature - par un entonnoir approprié 11 en matière plastique dont une extrémité cylindrique est emmanchée à force sur ladite collerette.The edge of the mouth of small diameter of the frustoconical housing 7, or more precisely that of a cylindrical flange 10 axially extending this mouth, is connected in a relatively sealed manner to the end of the sheath 5 -: which sheath is interrupted by below the end of the frame 2 to allow the grips of the jaws 8 on this frame - by a suitable funnel 11 made of plastic material, a cylindrical end of which is force fitted onto said flange.

C'est essentiellement la fermeture de l'autre embouchure dudit logement 7, savoir celle de plus grand diamètre, qui est concernée par la présente invention.It is essentially the closure of the other mouth of said housing 7, namely that of larger diameter, which is concerned with the present invention.

Le bord de cette embouchure se présente ici sous la forme d'une cuvette 12 de révolution dont la face interne comprend, raccordées successivement les unes aux autres :

  • - une plage annulaire transversale plane 13 formant le fond de la cuvette,
  • - une plage 14 incurvée en tronc de cône ou en quart de tore,
  • - une première plage cylindrique 15,
  • - une plage tronconique évasée 16,
  • - et une seconde plage cylindrique 17.
The edge of this mouth is here in the form of a bowl 12 of revolution, the internal face of which comprises, successively connected to each other:
  • a flat transverse annular area 13 forming the bottom of the bowl,
  • a range 14 curved in a truncated cone or in a quarter torus,
  • a first cylindrical area 15,
  • - a flared tapered surface 16,
  • - And a second cylindrical area 17.

Sur la plage cylindrique 17 font saillie trois nervures 18 en arc de cercle décalées angulairement entre elles de 120° autour de l'axe et séparées angulairement les unes des autres par des intervalles 19 (figure 3).On the cylindrical surface 17 project three ribs 18 in an arc of a circle angularly offset between them by 120 ° around the axis and angularly separated from each other by intervals 19 (FIG. 3).

En outre, une encoche 20 interrompt l'une des trois nervures 18 sur un angle de l'ordre de 30°.In addition, a notch 20 interrupts one of the three ribs 18 at an angle of the order of 30 °.

Pour fermer la cuvette 12 dont le profil intérieur vient d'être défini, on a recours à un capot 21 constitué en une matière plastique légèrement déformable telle que le polypropylène,moulé, notamment par injection.To close the bowl 12 whose internal profile comes to be defined, use is made of a cover 21 made of a slightly deformable plastic material such as polypropylene, molded, in particular by injection.

Ce capot se présente sous la forme générale d'une cloche de révolution comprenant, raccordés successivement les uns. aux autres :

  • - une pastille circulaire centrale 22 constituant le sommet de la cloche,
  • - un col tronconique 23,
  • - et une jupe cylindrique 24 dont le bord terminal 25 est aminci et dont le diamètre extérieur est légèrement inférieur au diamètre intérieur de la plage cylindrique 15 ci-dessus de la cuvette 12.
This cover is in the general form of a bell of revolution comprising, successively connected together. to others :
  • a central circular patch 22 constituting the top of the bell,
  • - a frustoconical neck 23,
  • - And a cylindrical skirt 24 whose end edge 25 is thinned and whose outside diameter is slightly less than the inside diameter of the cylindrical area 15 above of the bowl 12.

L'amincissement terminal en question correspond à une suppression d'épaisseur de la jupe à l'intérieur de celle-ci et non pas à l'extérieur.The terminal thinning in question corresponds to a removal of the thickness of the skirt inside of it and not outside.

En d'autres termes, si un décrochement apparaît en 26 sur la face intérieure de la jupe, sa face extérieure demeure sensiblement cylindrique sur toute son étendue tout en pouvant être rendue légèrement tronconique et convergente vers l'axe à son extrémité.In other words, if a setback appears at 26 on the inner face of the skirt, its outer face remains substantially cylindrical over its entire extent while being able to be made slightly frustoconical and converging towards the axis at its end.

L'épaisseur de ce bord aminci 25 est avantageusement comprise entre 0,4 et 0,6 mm.The thickness of this thinned edge 25 is advantageously between 0.4 and 0.6 mm.

Sur la face extérieure de la jupe 24 font saillie trois ergots de verrouillage 27 et un ergot de détrompage et d'arrêt angulaire 28.On the outer face of the skirt 24 project three locking pins 27 and a keying pin and angular stop 28.

Chaque ergot de verrouillage.27 est ici délimité latéralement par deux faces planes 29 parallèles à l'axe de l'ensemble et extérieurement par un dièdre saillant à angle aigu comprenant, du côté du sommet du capot, une face plane 30 perpendiculaire à cet axe et, de l'autre côté, une face 31 légèrement inclinée sur ledit axe.Each locking pin. 27 is here delimited laterally by two plane faces 29 parallel to the axis of the assembly and externally by a projecting dihedral at an acute angle comprising, on the side of the top of the cover, a plane face 30 perpendicular to this axis. and, on the other side, a face 31 slightly inclined on said axis.

L'inclinaison en question est sensiblement égale à celle de la face tronconique 16 de la cuvette.The inclination in question is substantially equal to that of the frustoconical face 16 of the bowl.

La largeur de chaque ergot 27 est inférieure à celle des intervalles 19.The width of each lug 27 is less than that of the intervals 19.

La distance axiale entre les faces transversales 30 desdits ergots ét la tranche terminale de la jupe 24 est sensiblement égale à la distance axiale entre le fond plat de la cuvette 12 et la face, de chaque nervure 18, tournée vers ce fond.The axial distance between the transverse faces 30 of said lugs and the end edge of the skirt 24 is substantially equal to the axial distance between the flat bottom of the bowl 12 and the face of each rib 18, facing this bottom.

L'ergot de détrompage 28 se présenta sous la forme d'un patin prismatique de génératrices parallèles à l'axe de l'ensemble et de directrice semi-circulaire ou rectangulaire.The coding lug 28 was in the form of a prismatic pad of generatrices parallel to the axis of the assembly and of semi-circular or rectangular director.

Cet ergot est prévu de façon à pouvoir pénétrer axialement dans l'encoche 20 et à venir buter angulairement contre les extrémités angulaires de cette encoche en vue de déterminer les fins de course du montage.This lug is provided so as to be able to penetrate axially into the notch 20 and to come into angular abutment against the angular ends of this notch in order to determine the limit switches of the assembly.

Deux oreilles 32 venues de moulage avec le capot font saillie sur son col 23 et facilitent la commande manuelle de ses déplacements angulaires.Two ears 32 molded with the cover protrude from its neck 23 and facilitate manual control of its angular movements.

Ces oreilles sont par exemple plates et triangulaires comme bien visible sur la figure 4.These ears are for example flat and triangular as clearly visible in FIG. 4.

Dans le fond du capot sont évidés deux trous 33 à travers lesquels on peut remplir en graisse ou plus précisément compléter le remplissage en graisse de l'ensemble des volumes intercommunicants situés à l'intérieur du capot 21, de la cuvette 22, du logement 7, de l'entonnoir 11 et de la gaine 5.In the bottom of the cover are hollowed out two holes 33 through which one can fill with grease or more precisely complete the filling with grease of all of the intercommunicating volumes located inside the cover 21, of the bowl 22, of the housing 7 , funnel 11 and sheath 5.

Ces trous 33 sont avantageusement prévus à l'extrémité de cheminées axiales 34 formées dans le col 23.These holes 33 are advantageously provided at the end of axial chimneys 34 formed in the neck 23.

Ils peuvent être obturés à l'aide de petits bouchons 35 montés à l'extrémité de pattes flexibles 36 venues de moulage, tout comme ces bouchons 35, avec l'ensemble du capot : cette dernière mesure permet d'éviter la perte des bouchons en cause et rend ceux-ci constamment disponibles.They can be closed using small plugs 35 mounted at the end of flexible lugs 36 molded, just like these plugs 35, with the entire cover: this last measure avoids the loss of plugs in causes and makes these constantly available.

Pour monter le capot 21 sur la cuvette 12, on procède. par un mouvement en baïonnette..To mount the cover 21 on the bowl 12, we proceed. with a bayonet movement.

En d'autres termes, on commence par orienter ce capot de façon telle que ses ergots 27 et 28 se présentent respectivement en regard axialement des intervalles 19 et de l'encoche 20.In other words, we begin by orienting this cover in such a way that its lugs 27 and 28 are respectively facing axially the intervals 19 and the notch 20.

On introduit alors axialement ces ergots dans leurs logements en même temps que la jupe 24 dans la cuvette 12.These pins are then introduced axially into their housings at the same time as the skirt 24 in the bowl 12.

A la fin de cette introduction axiale le bord aminci 25 de la jupe 24 vient en contact avec la plage incurvée 14 du fond de la cuvette.At the end of this axial introduction, the thinned edge 25 of the skirt 24 comes into contact with the curved surface 14 of the bottom of the bowl.

On fait alors tourner le capot dans le sens du vissage., ce qui fait pénétrer angulairement les ergots 27 dans les rainures en arc de cercle définies entre les nervures 18 et la plage tronconique 16 de la cuvette.The cover is then rotated in the screwing direction., Which angularly penetrates the pins 27 in the grooves in an arc defined between the ribs 18 and the frustoconical surface 16 of the bowl.

Cette pénétration angulaire est guidée par un profilage légèrement oblique des faces des nervures contre lesquelles viennent porter les ergots : ce guidage a pour effet d'assurer un léger effet de coincement sur les ergots au fur et a mesure de leur pénétration dans leurs rainures, ce qui rend cette pénétration peu réversible involontairement, et de repousser légèrement en direction axiale le bord 25 contre la plage 14, ce qui assure automatiquement entre ces deux éléments un contact très intime et donc étanche à la graisse, l'application en question se traduisant éventuellement par une légère déformation centripète dudit bord 25.This angular penetration is guided by a slightly oblique profiling of the faces of the ribs against which the pins come to bear: this guidance has the effect of ensuring a slight wedging effect on the pins as they penetrate their grooves, this which makes this penetration little reversible involuntarily, and to push back slightly in the axial direction the edge 25 against the pad 14, which automatically ensures between these two elements a very intimate contact and therefore grease tight, the application in question possibly resulting by a slight centripetal deformation of said edge 25.

La fin de course du déplacement angulaire considéré est assurée par butée de l'ergot 28 contre le bout de nérvu- re 18 en regard.The end of travel of the angular displacement considered is ensured by abutment of the lug 28 against the end of the nerve 18 opposite.

Le capot 21 est alors assujetti d'une manière extrêmement solide et rigoureusement étanche sur la cuvette 12.The cover 21 is then fixed in an extremely solid and rigorously tight manner on the bowl 12.

Pour le démontage, il suffit d'exécuter le mouvement en baïonnette inverse de celui précédemment décrit.For disassembly, simply execute the reverse bayonet movement to that previously described.

En suite de quoi, et quel que soit le mode de réalisation adopté, on obtient finâlemént un dispositif d'ancrage dont la constitution et la mise en oeuvre résultent suffisamment de ce qui précède.As a result of which, and whatever the embodiment adopted, there is finally obtained an anchoring device whose constitution and implementation result sufficiently from the above.

Ce dispositif présente de nets avantages par rapport à ceux antérieurement connus, notamment en ce qui concerne le faible prix et la simplicité du montage, lequel ne nécessite plus le recours à un joint d'étanchéité.This device has clear advantages over those previously known, in particular as regards the low price and the simplicity of the assembly, which no longer requires the use of a seal.

Comme il va de soi, et comme il résulte d'ailleurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réalisation qui ont été plus spécialement envisagés; elle en embrasse, au contraire, toutes les variantes.As is obvious, and as already follows from the above, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants.

Claims (7)

1. Dispositif d'ancrage pour retenir une extrémité d'une armature (2) de précontrainte contenue dans une gaine (5) avec de la graisse, comprenant d'une part une plaque .. rigide de répartition (6) évidée par un logement tronconique (7) propre à recevoir jointivement l'extrémité d'armature à retenir entourée d'une couronne tronconique de mors (8) , et d'autre part un capot propre à recouvrir et à fermer d'une façon étanche à la graisse l'extrémité de plus grand diamètre dudit logement, l'extrémité de plus petit diamètre de ce logement étant elle-même reliée de façon étanche à l'extrémité correspondante dé la gaine (5), caractérisé en ce que son capot est constitué par une cloche en matière plastique légèrement déformable (21) présentant une jupe cylindrique (24) à bord aminci (25) qui porte sur sa face extérieure au moins deux ergots de verrouillage (27), et en ce que la portion de sa plaque propre à recevoir le capot présente la forme d'une cuvette de révolution (12) dont le fond (14) de la face latérale interne présente une forme tronconique ou analogue propre à coagir avec le bord aminci (25) de la jupe ci-dessus de manière à assurer une application mutuelle étanche entre ce fond et ce bord, ladite face portant des nervures (18) en arc de cercle propres à coagir avec les ergots (27) ci-dessus de façon à assurer un verrouillage à baïonnette du capot sur la cuvette.1. Anchoring device for retaining one end of a prestressing frame (2) contained in a sheath (5) with grease, comprising on the one hand a rigid distribution plate (6) hollowed out by a housing frusto-conical (7) suitable for receiving the joining end of the reinforcement to be retained surrounded by a frusto-conical crown of jaws (8), and on the other hand a cover capable of covering and closing in a grease-tight manner l end of larger diameter of said housing, the end of smaller diameter of this housing itself being tightly connected to the corresponding end of the sheath (5), characterized in that its cover is constituted by a bell in slightly deformable plastic (21) having a cylindrical skirt (24) with a thinned edge (25) which carries on its outer face at least two locking lugs (27), and in that the portion of its plate suitable for receiving the hood has the shape of a bowl of revolution (12) whose bottom (14) of the internal lateral face has a frustoconical shape or the like suitable for interacting with the thinned edge (25) of the above skirt so as to ensure a sealed mutual application between this bottom and this edge, said face carrying ribs (18) in an arc suitable for coagulating with the lugs (27) above so as to ensure bayonet locking of the cover on the bowl. 2. Dispositif d'ancrage selon la revendication 1, caractérisé en ce que la face extérieure de la jupe (24) porte au moins un ergot (28) de détrompage et d'arrêt angulaire propre à coagir avec une encoche (20) évidée dans l'une des nervures (18).2. Anchoring device according to claim 1, characterized in that the outer face of the skirt (24) carries at least one lug (28) for coding and angular stop suitable for coagulating with a notch (20) hollowed out in one of the ribs (18). 3. Dispositif d'ancrage selon l'ùne quelconque des précédentes revendications, caractérisé en ce que chaque ergot de verrouillage (27) est délimité latéralement par deux faces planes parallèles (29) et extérieurement par un dièdre saillant à angle aigu dont la face (30) disposée du côté du sommet du capot est perpendiculaire à l'axe de ce capot et dont l'autre face (31) est légèrement inclinée sur cet axe, et en ce que la face latérale interne de la cuvette comprend une portée tronconique (16) propre à coagir jointivement avec ladite face légèrement inclinée (31).3. An anchoring device according to any one of the preceding claims, characterized in that each locking lug (27) is delimited laterally by two parallel flat faces (29) and externally by a projecting dihedral at an acute angle whose face ( 30) disposed on the side of the top of the cover is perpendicular to the axis of this cover and the other face (31) of which is slightly inclined on this axis, and in that the internal lateral face of the bowl comprises a frustoconical surface (16) capable of interacting with said slightly inclined face (31). 4. Dispositif d'ancrage selon la revendication 3, caractérisé en ce que les nervures propres à coagir avec les ergots de verrouillage sont légèrement inclinées de façon à exercer un effet de coincement.4. An anchoring device according to claim 3, characterized in that the ribs capable of interacting with the locking lugs are slightly inclined so as to exert a wedging effect. 5. Dispositif d'ancrage selon l'une quelconque des précédentes revendications, caractérisé en ce que deux oreilles (32) venues de moulage avec le capot (21) sont prévues sur la face extérieure du fond de ce capot.5. An anchoring device according to any one of the preceding claims, characterized in that two ears (32) coming from molding with the cover (21) are provided on the external face of the bottom of this cover. 6. Dispositif d'ancrage selon l'une quelconque des précédentes revendications, caractérisé en ce que le fond du capot (21) comprend un disque central plan (22) et un col tronconique (23) raccordant ce disque avec la jupe (24).6. An anchoring device according to any one of the preceding claims, characterized in that the bottom of the cover (21) comprises a flat central disc (22) and a frustoconical neck (23) connecting this disc with the skirt (24) . 7. Dispositif d'ancrage selon l'une quelconque des précédentes revendications, caractérisé en ce que le fond du capot (21) est évidé d'au moins un trou (33) pour l'introduction de graisse et est solidarisé par l'intermédiaire d'une patte flexible (36) avec un bouchon (35) propre à obturer ce trou, l'ensemble de cette patte et de ce bouchon étant venu de moulage par injection avec le capot.7. Anchoring device according to any one of the preceding claims, characterized in that the bottom of the cover (21) is hollowed out from at least one hole (33) for the introduction of grease and is secured via a flexible tab (36) with a plug (35) suitable for closing this hole, the assembly of this tab and of this plug having come from injection molding with the cover.
EP84400676A 1983-04-06 1984-04-05 Anchoring devices for lubricated prestressing reinforcements Withdrawn EP0122197A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8305612 1983-04-06
FR8305612A FR2543996B1 (en) 1983-04-06 1983-04-06 IMPROVEMENTS IN ANCHORING DEVICES FOR GREASE PRE-STRESS REINFORCEMENTS

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EP0122197A2 true EP0122197A2 (en) 1984-10-17
EP0122197A3 EP0122197A3 (en) 1985-07-10

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EP84400676A Withdrawn EP0122197A3 (en) 1983-04-06 1984-04-05 Anchoring devices for lubricated prestressing reinforcements

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EP (1) EP0122197A3 (en)
FR (1) FR2543996B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138041A (en) * 1984-07-25 1986-02-24 フレシネ　アンテルナシヨナル（エステ−ウ−ペ−） Apparatus for anchoring prestressed reinforcing member covered with grease
US4616458A (en) * 1985-07-01 1986-10-14 Vsl Corporation Protective apparatus for tendons in tendon tensioning anchor assemblies
US6023894A (en) * 1998-01-15 2000-02-15 Sorkin; Felix L. Anchor of a post-tension anchorage system with an improved cap connection

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1917370A1 (en) * 1969-04-03 1970-11-19 Sager & Woerner Arrangement for the protection of tendon anchorages
GB1216923A (en) * 1968-04-24 1970-12-23 Ccl Systems Ltd Improvements in or relating to anchorage assemblies for the prestressing of concrete structures
WO1982001208A1 (en) * 1980-09-25 1982-04-15 M Schupack Electrically isolated reinforcing tendon assembly and method
FR2492870A1 (en) * 1980-10-27 1982-04-30 Precontrainte Structures Ste F Anchor for cable in concrete - has perforated plate sandwiched between sealing cap and steel support plate
US4363462A (en) * 1980-01-26 1982-12-14 Dyckerhoff & Widmann Aktiengesellschaft Recoverable formwork part for forming the anchoring location of a tendon in a concrete structural component

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1216923A (en) * 1968-04-24 1970-12-23 Ccl Systems Ltd Improvements in or relating to anchorage assemblies for the prestressing of concrete structures
DE1917370A1 (en) * 1969-04-03 1970-11-19 Sager & Woerner Arrangement for the protection of tendon anchorages
US4363462A (en) * 1980-01-26 1982-12-14 Dyckerhoff & Widmann Aktiengesellschaft Recoverable formwork part for forming the anchoring location of a tendon in a concrete structural component
WO1982001208A1 (en) * 1980-09-25 1982-04-15 M Schupack Electrically isolated reinforcing tendon assembly and method
FR2492870A1 (en) * 1980-10-27 1982-04-30 Precontrainte Structures Ste F Anchor for cable in concrete - has perforated plate sandwiched between sealing cap and steel support plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138041A (en) * 1984-07-25 1986-02-24 フレシネ　アンテルナシヨナル（エステ−ウ−ペ−） Apparatus for anchoring prestressed reinforcing member covered with grease
JPH0375697B2 (en) * 1984-07-25 1991-12-03 Fureshine Intern Stup
US4616458A (en) * 1985-07-01 1986-10-14 Vsl Corporation Protective apparatus for tendons in tendon tensioning anchor assemblies
US6023894A (en) * 1998-01-15 2000-02-15 Sorkin; Felix L. Anchor of a post-tension anchorage system with an improved cap connection

Also Published As

Publication number Publication date
FR2543996A1 (en) 1984-10-12
EP0122197A3 (en) 1985-07-10
FR2543996B1 (en) 1985-11-15

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