EP0122860A2 - Methods and devices for lubricating the ends of prestressing reinforcements - Google Patents

Methods and devices for lubricating the ends of prestressing reinforcements Download PDF

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Publication number
EP0122860A2
EP0122860A2 EP84400763A EP84400763A EP0122860A2 EP 0122860 A2 EP0122860 A2 EP 0122860A2 EP 84400763 A EP84400763 A EP 84400763A EP 84400763 A EP84400763 A EP 84400763A EP 0122860 A2 EP0122860 A2 EP 0122860A2
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EP
European Patent Office
Prior art keywords
cover
housing
needle
bowl
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84400763A
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German (de)
French (fr)
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EP0122860A3 (en
EP0122860B1 (en
Inventor
Christian Tourneur
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Freyssinet International STUP SA
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Freyssinet International STUP SA
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Publication date
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Priority to AT84400763T priority Critical patent/ATE31772T1/en
Publication of EP0122860A2 publication Critical patent/EP0122860A2/en
Publication of EP0122860A3 publication Critical patent/EP0122860A3/en
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Publication of EP0122860B1 publication Critical patent/EP0122860B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • the invention relates to the lubrication of the ends of certain reinforcements intended, by their tensioning, to ensure the prestressing of concrete elements, said reinforcements being contained in sheaths filled with grease and these sheaths being interrupted a little below the ends. of the frames they contain.
  • the end of the larger diameter of said housing namely that which opens on the side, of the plate, opposite the concrete element, constitutes the center of a bowl itself closed in a grease-tight manner by a cover then that the other end of the housing is connected in a relatively grease-tight manner to the corresponding sheath end, in particular by means of a plastic funnel.
  • this fat is injected into this volume through a hole in the hood.
  • the object of the invention is, above all, to remedy these drawbacks by ensuring, in a very simple manner, complete filling with grease without it being necessary to give the injection pressure a high value.
  • a rectilinear groove whose mean line is parallel to a generatrix of the truncated cone delimiting this housing and on the other share, in the cover, an orifice capable of being aligned in the extension of the groove during the mounting of this cover on the bowl.
  • 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 reinforcement in question intended to subject a concrete element or structure 1 to prestressing by being tensioned between its two ends, is preferably constituted by a strand 2 itself composed of wires wound around a central wire of slightly larger diameter.
  • this strand is itself enveloped by a sheath 3 of plastic, for example polyethylene, and the volumes between this sheath and the constituent wires of the strand are filled with grease.
  • plastic for example polyethylene
  • 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, in particular against humidity.
  • an anchoring device which comprises a metal plate 4, in particular of cast iron, thickened in its center and pierced in this center by a frustoconical housing 5.
  • This housing 5 is suitable for receiving the reinforcement end in question surrounded by a set of three jaws 6 forming a ring split longitudinally according to three slots 7: each of these jaws extends substantially over 120 ° around the axis common to the strand 2 and to the housing 5 and has a cylindrical inner face suitable for matching the strand and a frustoconical outer face complementary to the housing and bearing against the latter.
  • the edge of the mouth of small diameter of the frustoconical housing 5, or more precisely that of a cylindrical flange 8 extending this mouth axially, is connected in a relatively tight manner to the end of the sheath 3 - which sheath is interrupted below of the end of the frame 2 to allow the grips of the jaws 8 on this frame - by a suitable funnel 9 made of plastic material, a cylindrical end of which is force fitted onto said flange.
  • the edge of the other mouth of the housing 5, namely that of larger diameter, has the shape of a bowl of revolution 10 closed in leaktight manner by a cover 11.
  • the cross sections of the two housings 12 and 13 are such that they can both pass, preferably with clearance, to a straight rectilinear needle 14 intended to fill the device with grease, as will be explained below.
  • the outside diameter of this needle is generally between 1.5 and 3 mm so that the width of each of the housings 12 and 13 is advantageously between 2 and 5 mm.
  • the profile of the groove 12 preferably has the shape of a U.
  • one of the slots 7 separating two contiguous jaws can be located opposite the groove 12 just as the latter can be covered over its entire width by the same jaw: in the latter case, if we consider that the angular width of the groove 12, seen from the axis of the device, is of the order of 10 °, this width represents only about one tenth of that of the portion, of the internal frustoconical face of the housing 5, against which the jaw considered leans.
  • the bowl 10 and the cover 11 are preferably constructed in such a way that the mounting of the second on the first ends automatically by placing the orifice 13 in alignment with the groove 12.
  • angular positioning means mutual funds are provided respectively on these two elements 10 and 11.
  • said elements are constituted in the manner explained in the French patent above.
  • the two elements in question are arranged in such a way that their mutual assembly is ensured by a bayonet movement, guided by cooperation of lugs 15, 16 provided on the cover with interrupted circular ribs 17 provided on the cup, the end of the angular stroke which constitutes the second and last phase of the bayonet movement being determined by angular stop of the lug 16 against one of the ribs 17.
  • the needle 14 After mounting the cover on the bowl, the needle 14 is pushed in fully through the orifice 13 and the groove 12: the end 18 of this needle then opens in the immediate vicinity of the end of the sheath 3, inside the funnel 9.
  • the evacuation of this air from the cover 11 is preferably carried out through a second orifice 20 hollowed out in the bottom of this cover and then open, but could also be through the orifice 13 itself, the cross section of which is then provided greater than that of the needle 14.
  • this needle can gradually be released as the assembly is filled with fat, it is preferable to wait until the fat begins to flow back out of the hood to initiate this release.
  • Such a closure can be obtained in any desirable manner by means of plugs independent or not of the cover 11.
  • this pressure itself relatively low, is applied at the level of the cover, by the air and / or the grease expelled from the end of the needle, only after a reduction due to pressure losses imposed on this air and / or on this grease when passing through reduced-section discharge conduits: therefore, it is possible to adopt for the cover an article having a relatively low mechanical resistance such as one of those plastic described in the France patent above, which have both the advantage of a price low, that of an easy implementation, making useless the recourse to independent seals, and that of a great longevity.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Lubricants (AREA)
  • Ropes Or Cables (AREA)
  • Knitting Machines (AREA)

Abstract

For greasing the end of a reinforcement (2) surrounded by a sheath (3) and retained in a truncated cone shaped ring of jaws (6) coacting with a truncated cone shaped housing (5) formed in an anchorage plate (4), which housing is closed by a cap (11), a longitudinal rectilinear groove (12) is formed in this housing and in this cap is formed an orifice (13) automatically aligned with the groove at the end of fitting of the cap and the inner volume of the assembly is filled with grease through a rectilinear hollow needle (14) passing successively through said orifice and said groove.

Description

L'invention concerne le graissage des extrémités de certaines armatures destinées, par leur mise sous tension, à assurer la précontrainte d'éléments en béton, lesdites armatures étant contenues dans des gaines comblées de graisse et ces gaines étant interrompues un peu en deçà des extrémités des armatures qu'elles contiennent.The invention relates to the lubrication of the ends of certain reinforcements intended, by their tensioning, to ensure the prestressing of concrete elements, said reinforcements being contained in sheaths filled with grease and these sheaths being interrupted a little below the ends. of the frames they contain.

Elle concerne plus particulièrement le cas où l'extrémité à graisser est ancrée, par l'intermédiaire d'une couronne tronconique discontinue de mors, dans un logement tronconique, complémentaire de cette couronne, évidé dans une plaque rigide prenant appui sur l'élément en béton a précontraindre.It relates more particularly to the case where the end to be greased is anchored, by means of a discontinuous frustoconical crown of jaws, in a frustoconical housing, complementary to this crown, hollowed out in a rigid plate bearing on the element in concrete to prestress.

L'extrémité de plus grand diamètre dudit logement, savoir celle qui débouche du côté, de la plaque, opposé à l'élément en béton, constitue le centre d'une cuvette elle-même fermée de façon étanche à la graisse par un capot alors que l'autre extrémité du logement est reliée de façon relativement étanche à la graisse à l'extrémité de gaine correspondante, notamment par l'intermédiaire d'un entonnoir en matière plastique.The end of the larger diameter of said housing, namely that which opens on the side, of the plate, opposite the concrete element, constitutes the center of a bowl itself closed in a grease-tight manner by a cover then that the other end of the housing is connected in a relatively grease-tight manner to the corresponding sheath end, in particular by means of a plastic funnel.

Dans les modes de réalisation connus de ces ensembles, pour compléter le remplissage en graisse du volume formé par les espaces intercommunicants contenus à l'intérieur du capot, de la cuvette, du logement tronconique, de l'entonnoir de liaison ou analogue et de la gaine, on injecte cette graisse dans ce volume à travers un orifice évidé dans le capot.In the known embodiments of these assemblies, to complete the filling with grease of the volume formed by the intercommunicating spaces contained inside the cover, the bowl, the frustoconical housing, the connecting funnel or the like and the sheath, this fat is injected into this volume through a hole in the hood.

Ce procédé présente plusieurs inconvénients et en particulier les suivants.This process has several drawbacks and in particular the following.

Pour que la graisse puisse pénétrer assez profondément dans le volume à remplir, savoir jusqu'au niveau de la gaine, il faut développer une pression relativement élevée sur cette graisse lors de son injection.In order for the fat to penetrate deep enough into the volume to be filled, namely down to the level of the sheath, it is necessary to develop a relatively high pressure on this fat during its injection.

Cette pression élevée nécessite le recours à des capots mécaniquement résistants et donc coûteux ainsi que la réalisation d'une étanchéité rigoureuse entre ce capot et la cuvette en regard.This high pressure requires the use of mechanically resistant and therefore costly hoods as well as the production of a rigorous seal between this hood and the facing bowl.

De plus, même pour des valeurs très élevées de la pression d'injection, le remplissage en graisse laisse souvent à désirer, la graisse introduite dans les petits interstices à combler formant elle-même obstacle à l'échappement, à travers ces interstices, des bulles d'air que cette graisse est destinée à remplacer.In addition, even for very high values of the injection pressure, the filling with grease often leaves something to be desired, the grease introduced into the small interstices to be filled forming itself an obstacle to the exhaust, through these interstices, air bubbles that this grease is intended to replace.

L'invention a pour but, surtout, de remédier à ces inconvénients en assurant d'une manière très simple un remplissage complet en graisse sans qu'il soit nécessaire de donner à la pression d'injection' une valeur élevée.The object of the invention is, above all, to remedy these drawbacks by ensuring, in a very simple manner, complete filling with grease without it being necessary to give the injection pressure a high value.

A cet effet, conformément à l'invention, on prévoit d'une part, dans la face interne tronconique du logement des mors, une rainure rectiligne dont la ligne moyenne est parallèle à une génératrice du tronc de cône délimitant ce logement et d'autre part, dans le capot, un orifice susceptible d'être aligné dans le prolongement de la rainure lors du montage de ce capot sur la cuvette.To this end, in accordance with the invention, there is provided on the one hand, in the frustoconical internal face of the jaw housing, a rectilinear groove whose mean line is parallel to a generatrix of the truncated cone delimiting this housing and on the other share, in the cover, an orifice capable of being aligned in the extension of the groove during the mounting of this cover on the bowl.

De la sorte, il est possible d'assurer le remplissage désiré de graisse à travers une aiguille creuse rectiligne traversant successivement cet orifice et le canal délimité par cette rainure et le mors en regard.In this way, it is possible to ensure the desired filling of grease through a rectilinear hollow needle successively passing through this orifice and the channel delimited by this groove and the jaw facing it.

Pour procéder à un tel remplissage, on commence par introduire ladite aiguille à fond dans ces deux logements alignés de façon que son extrémité débouche au voisinage immédiat de l'extrémité de la gaine, puis on injecte la graisse à travers cette aiguille jusqu'à son reflux hors du capot, après quoi l'on extrait l'aiguille tout en poursuivant l'injection de graisse jusqu'à la fin de cette extraction.To carry out such a filling, we first introduce said needle as far as possible into these two aligned housings so that its end opens in the immediate vicinity of the end of the sheath, then the fat is injected through this needle until its reflux out of cover, after which the needle is extracted while continuing the injection of grease until the end of this extraction.

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

  • - des moyens complémentaires sont prévus sur le capot et sur la cuvette pour placer automatiquement l'orifice de ce capot dans le prolongement de la rainure à la fin de son montage sur la cuvette,
  • - le capot et la cuvette sont agencés de façon à permettre le montage ènbalonnette du premier sur la seconde et les moyens complémentaires selon l'alinéa précédent comprennent respectivement sur ce capot et sur cette cuvette deux portées complémentaires propres à venir buter l'une contre l'autre à la fin de la course angulaire du capot qui termine ledit montage en baïonnette, conformément au brevet FR n° 83 05612
  • - le capot est constitué en une matière plastique,
  • - l'armature gainée et graissée est constituée par un toron unique.
In preferred embodiments, use is also made of one and / or the other of the following arrangements:
  • - additional means are provided on the cover and on the bowl to automatically place the orifice of this cover in the extension of the groove at the end of its mounting on the bowl,
  • - The hood and the bowl are arranged so as to allow the mounting of the balnonnette of the first on the second and the complementary means according to the preceding paragraph comprise respectively on this hood and on this bowl two complementary ranges capable of coming up against the one against the other at the end of the angular travel of the cover which ends said bayonet mounting, in accordance with patent FR n ° 83 05612
  • - the cover is made of a plastic material,
  • - the sheathed and greased reinforcement consists of a single strand.

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 au dessin ci-annexé d'une manière bien entendu non limitative.

  • La figure 1, de ce dessin, montre en coupe axiale l'extrémité d'un câble de précontrainte gainé et graissé ainsi que son dispositif d'ancrage et que les moyens de graissage de ce dispositif établis selon l'invention.
  • La figure 2 est une coupe transversale de la figure 1 selon II-II.
In what follows, a preferred embodiment of the invention will be described with reference to the attached drawing, of course in a non-limiting manner.
  • FIG. 1, of this drawing, shows in axial section the end of a sheathed and greased prestressing cable as well as its anchoring device and that the lubrication means of this device established according to the invention.
  • Figure 2 is a cross section of Figure 1 along II-II.

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

D'une façon connue en soi, ce toron est lui-même enveloppé par une gaine 3 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 3 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, en particulier contre 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, in particular against humidity.

L'une des extrémités du toron est retenue par un dispositif d'ancrage qui comporte une plaque métallique 4, notamment en fonte, épaissie en son centre et percée en ce centre par un logement tronconique 5.One of the ends of the strand is retained by an anchoring device which comprises a metal plate 4, in particular of cast iron, thickened in its center and pierced in this center by a frustoconical housing 5.

Ce logement 5 est propre à recevoir jointivement l'extrémité d'armature considérée entourée d'un jeu de trois mors 6 formant une bague fendue longitudinalement selon trois fentes 7 : chacun de ces mors s'étend sensiblement sur 120° autour de l'axe commun au toron 2 et au logement 5 et présente une face intérieure cylindrique propre à épouser le toron et une face extérieure tronconique complémentaire du logement et prenant appui contre celui-ci.This housing 5 is suitable for receiving the reinforcement end in question surrounded by a set of three jaws 6 forming a ring split longitudinally according to three slots 7: each of these jaws extends substantially over 120 ° around the axis common to the strand 2 and to the housing 5 and has a cylindrical inner face suitable for matching the strand and a frustoconical outer face complementary to the housing and bearing against the latter.

Le bord de l'embouchure de petit diamètre du logement tronconique 5, ou plus précisément celui d'une collerette cylindrique 8 prolongeant axialement cette embouchure, est raccordé de façon relativement étanche à l'extrémité de la gaine 3 - 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 9 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 5, or more precisely that of a cylindrical flange 8 extending this mouth axially, is connected in a relatively tight manner to the end of the sheath 3 - which sheath is interrupted below of the end of the frame 2 to allow the grips of the jaws 8 on this frame - by a suitable funnel 9 made of plastic material, a cylindrical end of which is force fitted onto said flange.

Le bord de l'autre embouchure du logement 5, savoir celle de plus grand diamètre, présente la forme d'une cuvette de révolution 10 obturée de façon étanche par un capot 11.The edge of the other mouth of the housing 5, namely that of larger diameter, has the shape of a bowl of revolution 10 closed in leaktight manner by a cover 11.

En outre, conformément à l'invention, on évide :

  • - dans la face tronconique interne au logement 5, une rainure rectiligne longitudinale 12 s'étendant parallèlement à une génératrice de cette face,
  • - et dans le fond du capot 11, un orifice 13 susceptible d'être aligné avec la rainure 12 lors du montage du capot 11 sur la cuvette 10.
In addition, in accordance with the invention, we hollow out:
  • - in the internal frustoconical face of the housing 5, a longitudinal rectilinear groove 12 extending parallel to a generatrix of this face,
  • - And in the bottom of the cover 11, an orifice 13 capable of being aligned with the groove 12 during the mounting of the cover 11 on the bowl 10.

Les sections droites des deux logements 12 et 13 sont telles qu'ils puissent tous les deux livrer passage, de préférence avec jeu, à une aiguille creuse rectiligne 14 destinée à assurer le remplissage en graisse du dispositif, comme il sera précisé plus loin.The cross sections of the two housings 12 and 13 are such that they can both pass, preferably with clearance, to a straight rectilinear needle 14 intended to fill the device with grease, as will be explained below.

Le diamètre extérieur de cette aiguille est généralement compris entre 1,5 et 3 mm de sorte que la largeur de chacun des logements 12 et 13 est avantageusement comprise entre 2 et 5 mm.The outside diameter of this needle is generally between 1.5 and 3 mm so that the width of each of the housings 12 and 13 is advantageously between 2 and 5 mm.

Le profil de la rainure 12 a de préférence la forme d'un U.The profile of the groove 12 preferably has the shape of a U.

Contrairement à ce que l'on aurait pu croire, la présence de cette rainure dans la face interne du logement 5 ne perturbe en rien le positionnement et le maintien des mors 6, et la position angulaire de ces mors par rapport à ladite rainure autour de l'axe du dispositif est elle-même tout à fait indifférente.Contrary to what one might have thought, the presence of this groove in the internal face of the housing 5 does not in any way disturb the positioning and the maintenance of the jaws 6, and the angular position of these jaws relative to said groove around the axis of the device is itself completely indifferent.

C'est ainsi que l'une des fentes 7 séparant deux mors contigus peut se trouver en regard de la rainure 12 tout comme cette dernière peut être recouverte sur toute sa largeur par un même mors : dans ce dernier cas, si l'on considère que la largeur angulaire de la rainure 12, vue de l'axe du dispositif, est de l'ordre de 10°, cette largeur ne représente qu'environ le dixième de celle de la portion, de la face tronconique interne du logement 5, contre laquelle prend appui le mors considéré.Thus one of the slots 7 separating two contiguous jaws can be located opposite the groove 12 just as the latter can be covered over its entire width by the same jaw: in the latter case, if we consider that the angular width of the groove 12, seen from the axis of the device, is of the order of 10 °, this width represents only about one tenth of that of the portion, of the internal frustoconical face of the housing 5, against which the jaw considered leans.

La cuvette 10 et le capot 11 sont de préférence constitués de façon telle que le montage du second sur la première s'achève automatiquement par mise de l'orifice 13 en alignement avec la rainure 12.The bowl 10 and the cover 11 are preferably constructed in such a way that the mounting of the second on the first ends automatically by placing the orifice 13 in alignment with the groove 12.

A cet effet des moyens de positionnement angulaires mutuels sont prévus respectivement sur ces deux éléments 10 et 11.For this purpose angular positioning means mutual funds are provided respectively on these two elements 10 and 11.

Selon un mode de réalisation particulièrement avantageux, on constitue lesdits éléments de la manière explicitée dans le brevet France ci-dessus.According to a particularly advantageous embodiment, said elements are constituted in the manner explained in the French patent above.

En d'autres termes, les deux éléments en question sont agencés de façon telle que leur assemblage mutuel soit assuré par un déplacement en baïonnette, guidé par coopération d'ergots 15, 16 prévus sur le capot avec des nervures circulaires interrompues 17 prévues sur la cuvette, la fin de la course angulaire qui constitue la seconde et dernière phase du déplacement en baïonnette étant déterminée par butée angulaire de l'ergot 16 contre l'une des nervures 17.In other words, the two elements in question are arranged in such a way that their mutual assembly is ensured by a bayonet movement, guided by cooperation of lugs 15, 16 provided on the cover with interrupted circular ribs 17 provided on the cup, the end of the angular stroke which constitutes the second and last phase of the bayonet movement being determined by angular stop of the lug 16 against one of the ribs 17.

Ceci étant, pour remplir de graisse le volume intérieur à l'ensemble décrit ci-dessus, on procède comme suit.This being so, to fill the volume inside the assembly described above with grease, the procedure is as follows.

Après montage du capot sur la cuvette, on enfonce à fond l'aiguille 14 à travers successivement l'orifice 13 et la rainure 12 : l'extrémité 18 de cette aiguille débouche alors à proximité immédiate de l'extrémité de la gaine 3, à l'intérieur de l'entonnoir 9.After mounting the cover on the bowl, the needle 14 is pushed in fully through the orifice 13 and the groove 12: the end 18 of this needle then opens in the immediate vicinity of the end of the sheath 3, inside the funnel 9.

A l'aide d'un graisseur 19 monté à demeure ou non sur l'extrémité extérieure de l'aiguille 14, on injecte de la graisse dans celle-ci, ce qui la dépose directement dans les zones les plus profondes du volume à remplir.Using a lubricator 19 mounted permanently or not on the outer end of the needle 14, grease is injected into it, which deposits it directly in the deepest areas of the volume to be filled .

L'air chassé de ces zones reflue alors vers l'extérieur à travers tous les conduits dégagés, notamment à travers les fentes 7 et à travers la portion, de la rainure 12, non occupée par l'aiguille 14 elle-même.The air expelled from these zones then flows back towards the outside through all the cleared conduits, in particular through the slots 7 and through the portion, of the groove 12, not occupied by the needle 14 itself.

L'évacuation de cet air hors du capot 11 est de préférence effectuée à travers un second orifice 20 évidé dans le fond de ce capot et alors ouvert, mais pourrait également l'être à travers l'orifice 13 lui-même, dont la section est alors prévue supérieure à celle de l'aiguille 14.The evacuation of this air from the cover 11 is preferably carried out through a second orifice 20 hollowed out in the bottom of this cover and then open, but could also be through the orifice 13 itself, the cross section of which is then provided greater than that of the needle 14.

Bien que l'on puisse dégager progressivement cette aiguille au fur et à mesure du remplissage de l'ensemble en graisse, on préfère attendre que la graisse commence à refluer hors du capot pour amorcer ce dégagement.Although this needle can gradually be released as the assembly is filled with fat, it is preferable to wait until the fat begins to flow back out of the hood to initiate this release.

On procède alors à celui-ci assez lentement pour que le volume progressivement libéré par l'aiguille pleine de graisse soit immédiatement comblé par la graisse que continue à débiter l'aiguille.We then proceed slowly enough so that the volume gradually released by the needle full of fat is immediately filled with the fat that continues to deliver the needle.

Après dégagement total de cette dernière hors du capot, on obture l'orifice 13 et l'orifice 20, si ce dernier est également prévu.After complete release of the latter out of the cover, the orifice 13 and the orifice 20 are closed, if the latter is also provided.

Une telle obturation peut être obtenue de toute façon désirable à l'aide de bouchons indépendants ou non du capot 11.Such a closure can be obtained in any desirable manner by means of plugs independent or not of the cover 11.

Le remplissage du dispositif en graisse est alors intégral.The filling of the device with grease is then complete.

En suite de quoi et quel que soit le mode de réalisation adopté, on dispose finalement de moyens pour remplir en graisse le dispositif d'ancrage d'une armature de précontrainte, moyens dont la constitution et le fonctionnement résultent suffisamment de ce qui précède.As a result of what and whatever the embodiment adopted, there are finally means available for filling the anchoring device with a prestressing armature in grease, means the constitution and operation of which result sufficiently from the above.

Ces moyens présentent un certain nombre d'avantages par rapport à ceux antérieurement connus.These means have a number of advantages over those previously known.

En plus du remplissage intégral signalé ci-dessus, un autre avantage important réside dans la valeur relativement faible requise pour la pression d'injection de la graisse : en effet les volumes d'air chassés au cours du remplissage peuvent s'évacuer librement, cette évacuation n'étant pas entravée par les volumes de graisse en cours d'injection.In addition to the full filling indicated above, another important advantage lies in the relatively low value required for the grease injection pressure: in fact the volumes of air expelled during filling can be evacuated freely, this evacuation not being hampered by the volumes of fat being injected.

Il est à noter en outre que cette pression, elle-même relativement faible, n'est appliquée au niveau du capot, par l'air et/ou la graisse chassés à partir de l'extrémité de l'aiguille, qu'après une réduction due aux pertes de charges imposées à cet air et/ou à cette graisse lors de leur traversée de conduits d'évacuation à section réduite : de ce fait, il est possible d'adopter pour le capot un article présentant une résistance mécanique relativement faible tel que l'un de ceux en matière plastique décrits dans le brevet France ci-dessus, lesquels présentent à la fois l'avantage d'un prix modique, celui d'une mise en oeuvre facile, rendant inutile le recours à des joints d'étanchéité indépendants, et celui d'une grande longévité.It should also be noted that this pressure, itself relatively low, is applied at the level of the cover, by the air and / or the grease expelled from the end of the needle, only after a reduction due to pressure losses imposed on this air and / or on this grease when passing through reduced-section discharge conduits: therefore, it is possible to adopt for the cover an article having a relatively low mechanical resistance such as one of those plastic described in the France patent above, which have both the advantage of a price low, that of an easy implementation, making useless the recourse to independent seals, and that of a great longevity.

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 foregoing, 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 pour graisser l'extrémité d'une armature (2) destinée à précontraindre un élément en béton (1) et contenue dans une gaine (3) comblée de graisse, gaine interrompue un peu en deçà de ladite extrémité, laquelle est ancrée; par l'intermédiaire d'une couronne tronconique discontinue de mors (6), dans un logement tronconique (5),complémentaire de cette couronne, évidé dans une plaque rigide (4) prenant appui sur l'élément de béton à précontraindre, l'extrémité de plus grand diamètre dudit logement, savoir celle qui débouche du côté, de la plaque, opposé à l'élément en béton, constituant le centre d'une cuvette (10) elle-même fermée de façon étanche à la graisse par un capot (11) alors que l'autre extrémité du logement est reliée de façon relativement étanche à la graisse à l'extrémité de gaine correspondante, caractérisé en ce que sont évidés d'une part, dans la face interne tronconique du logement (5) des mors (6), une rainure rectiligne (12) dont la ligne moyenne est parallèle à une génératrice du tronc de cône délimitant ce logement et d'autre part, dans le capot (11), un orifice (13) susceptible d'être aligné dans le prolongement de la rainure lors du montage de ce capot sur la cuvette.1. Device for greasing the end of a reinforcement (2) intended to prestress a concrete element (1) and contained in a sheath (3) filled with grease, sheath interrupted a little below said end, which is anchored ; by means of a discontinuous frustoconical crown of jaws (6), in a frustoconical housing (5), complementary to this crown, hollowed out in a rigid plate (4) bearing on the element of concrete to be prestressed, the end of larger diameter of said housing, namely that which opens on the side, of the plate, opposite the concrete element, constituting the center of a bowl (10) itself closed in a grease-tight manner by a cover (11) while the other end of the housing is connected in a relatively grease-tight manner to the corresponding sheath end, characterized in that, on the one hand, there are recesses in the frustoconical internal face of the housing (5) jaw (6), a rectilinear groove (12) whose mean line is parallel to a generatrix of the truncated cone delimiting this housing and on the other hand, in the cover (11), an orifice (13) capable of being aligned in the extension of the groove when mounting this cover on the bowl. 2. Dispositif de graissage selon la revendication 1, caractérisé en ce que des moyens complémentaires sont prévus sur la capot (11) et sur la cuvette (10) pour placer automatiquement l'orifice (13) de ce capot dans le prolongement de la rainure (12) à la fin de son montage sur la cuvette.2. Lubrication device according to claim 1, characterized in that additional means are provided on the cover (11) and on the bowl (10) to automatically place the orifice (13) of this cover in the extension of the groove (12) at the end of its mounting on the bowl. 3. Dispositif de graissage selon la revendication 2, caractérisé en ce que le capot (11) et la cuvette (10) sont agencés de façon à permettre le montage en baïonnette du premier sur la seconde et en ce que les moyens complémentaires comprennent respectivement sur ce capot et sur cette cuvette deux portées complémentaires (16, 17) propres à venir buter l'une contre l'autre à la fin de la course angulaire du capot qui termine ledit montage en baïonnette.3. Lubrication device according to claim 2, characterized in that the cover (11) and the bowl (10) are arranged so as to allow the bayonet mounting of the first on the second and in that the complementary means comprise respectively on this cover and on this bowl two complementary bearing surfaces (16, 17) suitable for abutting one against the other at the end of the angular travel of the cover which ends said bayonet mounting. 4. Dispositif de graissage selon l'une quelconque des précédentes revendications, caractérisé en ce que le capot (11) est constitué en une matière plastique.4. Lubrication device according to any one of the preceding claims, characterized in that the cover (11) is made of a plastic material. 5. Dispositif de graissage selon l'une quelconque des précédentes revendications, caractérisé en ce que l'armature (2) gainée et graissée est constituée par un toron unique.5. Lubrication device according to any one of the preceding claims, characterized in that the sheathed and greased reinforcement (2) consists of a single strand. 6. Procédé pour graisser l'extrémité d'une armature de précontrainte gainée et graissée à l'aide du dispositif selon l'une quelconque des précédentes revendications, caractérisé en ce que l'on introduit à fond une aiguille creuse rectiligne (14) successivement dans l'orifice (13) du capot et dans la rainure (12) de façon que l'extrémité (18) de cette aiguille débouche au voisinage immédiat de l'extrémité de la gaine (3), puis en ce que l'on injecte, la graisse à travers cette aiguille jusqu'à son reflux hors du capot (11),après quoi l'on extrait l'aiguille tout en poursuivant l'injection de la graisse jusqu'à la fin de son extraction.6. Method for greasing the end of a sheathed and greased prestressing armature using the device according to any one of the preceding claims, characterized in that a hollow rectilinear needle (14) is introduced in succession in the opening (13) of the cover and in the groove (12) so that the end (18) of this needle opens in the immediate vicinity of the end of the sheath (3), then in that one injects the fat through this needle until it flows back out of the cover (11), after which the needle is extracted while continuing to inject the fat until the end of its extraction. 7. Dispositif de graissage selon l'une quelconque des revendications 1 à 5, pour mettre en oeuvre le procédé selon la revendication 6, caractérisé en ce qu'il comprend en outre une aiguille creuse rectiligne (14) propre à traverser successivement l'orifice (3) évidé dans le capot et la rainure (12) alignée avec cet orifice, aiguille à une extrémité de laquelle est monté à demeure un graisseur (19).7. Lubrication device according to any one of claims 1 to 5, for implementing the method according to claim 6, characterized in that it further comprises a straight rectilinear needle (14) suitable for successively passing through the orifice (3) hollowed out in the cover and the groove (12) aligned with this orifice, needle at one end of which is mounted a lubricator (19).
EP84400763A 1983-04-19 1984-04-17 Methods and devices for lubricating the ends of prestressing reinforcements Expired EP0122860B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400763T ATE31772T1 (en) 1983-04-19 1984-04-17 METHODS AND DEVICES FOR LUBRICATION OF TENSIONS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306374 1983-04-19
FR8306374A FR2544768B1 (en) 1983-04-19 1983-04-19 IMPROVEMENTS TO METHODS AND DEVICES FOR LUBRICATING THE TENSIONING STRUCTURE EXTREMITIES

Publications (3)

Publication Number Publication Date
EP0122860A2 true EP0122860A2 (en) 1984-10-24
EP0122860A3 EP0122860A3 (en) 1985-06-19
EP0122860B1 EP0122860B1 (en) 1988-01-07

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EP84400763A Expired EP0122860B1 (en) 1983-04-19 1984-04-17 Methods and devices for lubricating the ends of prestressing reinforcements

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US (1) US4561226A (en)
EP (1) EP0122860B1 (en)
AT (1) ATE31772T1 (en)
DE (1) DE3468469D1 (en)
FR (1) FR2544768B1 (en)

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US4799307A (en) * 1986-05-30 1989-01-24 Tech Research, Inc. Anchor apparatus for a tendon in prestressed concrete slab
EP0344608A1 (en) * 1988-06-03 1989-12-06 Werner Zapf Kg Precast concrete element for prestressed concrete structures
EP0883721A1 (en) * 1996-02-26 1998-12-16 Felix L. Sorkin Method and apparatus for installing a multi-strand anchorage system
KR101243551B1 (en) * 2008-12-16 2013-03-20 리서치 인 모션 리미티드 Hybrid Automatic Repeat Request Round Trip Time and Acknowledgement/Negative Acknowledgement Repetition in Discontinuous Reception

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DE8437161U1 (en) * 1984-12-19 1985-03-21 Dyckerhoff & Widmann AG, 8000 München RING-SHAPED REINFORCEMENT ELEMENT FOR CONCRETE
US4928451A (en) * 1986-05-30 1990-05-29 Tech Research, Inc. Anchor apparatus for a tendon in prestressed concrete slab
US4719658A (en) * 1986-10-15 1988-01-19 Special Personal And Financial Planning And Referral Services, Inc. Hermetically sealed anchor construction for use in post tensioning tendons
DE3734954A1 (en) * 1987-03-13 1988-04-07 Dyckerhoff & Widmann Ag Corrosion-protected tensioning member, in particular stressing member for prestressed concrete without pretensioning, and process for its installation
US4821474A (en) * 1987-08-24 1989-04-18 Alan Rodriguez Post-tensioning anchor
US5079879A (en) * 1987-08-24 1992-01-14 Alan Rodriguez Anti-corrosive post-tensioning anchorage system
US5024032A (en) * 1987-08-24 1991-06-18 Alan Rodriguez Post-tensioning anchor
US4918887A (en) * 1987-10-14 1990-04-24 Vsl Corporation Protective tendon tensioning anchor assemblies
US5072558A (en) * 1988-04-21 1991-12-17 Varitech Industries, Inc. Post-tension anchor system
US4896470A (en) * 1988-04-21 1990-01-30 Varitech Industries, Inc. Tendon tensioning anchor
ES2100171T3 (en) * 1988-12-27 1997-06-16 Varitech Ind Inc METHOD OF ENCAPSULATING A TENSION TENSION ANCHOR.
US5058469A (en) * 1989-08-21 1991-10-22 Alan Rodriguez Cable shear and clamp system
US5440842A (en) * 1992-12-09 1995-08-15 Felix L. Sorkin Sealed tendon-tensioning anchor system
US5347777A (en) * 1993-04-23 1994-09-20 Post Tension Product Mfg., Inc. Anchor plate assembly
US6027278A (en) * 1998-01-15 2000-02-22 Sorkin; Felix L. Wedge-receiving cavity for an anchor body of a post-tension anchor system
US6234709B1 (en) * 1998-01-15 2001-05-22 Felix L. Sorkin Wedge-receiving cavity with radiused edge for an anchor body of a post-tension anchor system
US6017165A (en) * 1998-01-15 2000-01-25 Sorkin; Felix L. Wedge-receiving cavity for an anchor body of a post-tension anchor system
US8015774B1 (en) * 2008-07-31 2011-09-13 Sorkin Felix L Process and apparatus for forming a sheathing retaining anchor
US9317191B2 (en) * 2010-07-13 2016-04-19 Actuant Corporation Pocketed concrete anchor
US9834933B2 (en) * 2016-01-14 2017-12-05 John T. Schmidt Post-tension cable protection system, method for installing the system and method for remediation of a defective post-tension reinforcement system
CN110130650A (en) * 2019-05-24 2019-08-16 中国长江三峡集团有限公司 A kind of anticorrosion construction method of rack gear deformed bar

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GB1216923A (en) * 1968-04-24 1970-12-23 Ccl Systems Ltd Improvements in or relating to anchorage assemblies for the prestressing of concrete structures
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US4799307A (en) * 1986-05-30 1989-01-24 Tech Research, Inc. Anchor apparatus for a tendon in prestressed concrete slab
EP0344608A1 (en) * 1988-06-03 1989-12-06 Werner Zapf Kg Precast concrete element for prestressed concrete structures
EP0883721A1 (en) * 1996-02-26 1998-12-16 Felix L. Sorkin Method and apparatus for installing a multi-strand anchorage system
EP0883721A4 (en) * 1996-02-26 2000-11-08 Felix L Sorkin Method and apparatus for installing a multi-strand anchorage system
KR101243551B1 (en) * 2008-12-16 2013-03-20 리서치 인 모션 리미티드 Hybrid Automatic Repeat Request Round Trip Time and Acknowledgement/Negative Acknowledgement Repetition in Discontinuous Reception

Also Published As

Publication number Publication date
EP0122860A3 (en) 1985-06-19
FR2544768B1 (en) 1985-08-16
ATE31772T1 (en) 1988-01-15
DE3468469D1 (en) 1988-02-11
FR2544768A1 (en) 1984-10-26
EP0122860B1 (en) 1988-01-07
US4561226A (en) 1985-12-31

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