EP3495068A1 - Framework linking device - Google Patents

Framework linking device Download PDF

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Publication number
EP3495068A1
EP3495068A1 EP18000683.5A EP18000683A EP3495068A1 EP 3495068 A1 EP3495068 A1 EP 3495068A1 EP 18000683 A EP18000683 A EP 18000683A EP 3495068 A1 EP3495068 A1 EP 3495068A1
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EP
European Patent Office
Prior art keywords
sleeve
threaded
steel
nut
nuts
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
EP18000683.5A
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German (de)
French (fr)
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EP3495068B1 (en
Inventor
Edgar Henri Gérard Albert Thirion
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
    • B21F15/02—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire
    • B21F15/06—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/64—Making machine elements nuts
    • B21K1/68—Making machine elements nuts from round or profiled bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves

Definitions

  • the present invention relates to a reinforcing binding device, to a method of manufacturing such reinforcing binding devices, and to sets of reinforcements made with these devices.
  • the technical field of the invention is that of the manufacture of reinforcement steel for reinforced concrete.
  • the invention is particularly applicable to the butt connection devices of two steel reinforcing bars whose ends are threaded, which comprise a threaded sleeve which is screwed onto the threaded ends of the reinforcing bars to be butted.
  • the invention makes it possible to obtain such a sleeve whose outer surface has asperities reinforcing the adhesion of the concrete - in which the sleeve is intended to be embedded - on the sleeve.
  • This cohesion results in particular from the adhesion of the concrete on the reinforcements.
  • This need is reinforced for structures that must withstand significant dynamic loads, such as shocks or vibrations, throughout the life of the structure.
  • Such reinforcing bars are the subject of various prescriptions and standards such as the NF-A-36-016-1 and EN10080 standards, which in particular define alloys - or grades - of steel that can be used for the manufacture of these reinforcements. , the mechanical characteristics of these steels, and the geometric characteristics of the reinforcements.
  • Bars - or reinforcements - of this type have asperities on their outer surface, which may be protruding and qualified as “locks”, or on the contrary recessed and then called “fingerprints”.
  • the sleeve thus obtained which comprises a partition separating the two cavities, is then narrowed on the ends of two reinforcing bars to be assembled, this necking causing the formation of ribs on the outer face of the sleeve.
  • a disadvantage of this method is that the partition makes it difficult to obtain a uniform necking along the length of the sleeve, and that the rigidity of the connection formed by necking between the sleeve and the bars is difficult to control, especially when the shrinkage is achieved with a portable tool. In addition, the removal of this partition would require an additional operation.
  • the shrinkage of the wall of the sleeve does not allow to perfectly control the position and the depth of the external ribs intended to "lock" the sleeve to the concrete that surrounds it.
  • An object of the invention is to provide a butt joint of two steel reinforcements, and a connecting device incorporating such a sleeve, the resistance to traction forces and adhesion to concrete are improved.
  • An object of the invention is to propose a method for manufacturing reinforcing bonding devices, reinforcing binding devices obtained by this method, and sets of reinforcements made with these devices, which are improved and / or which remedy, at least in part, the shortcomings or disadvantages of the known reinforcement bonding systems.
  • a connecting sleeve for ensuring the end-to-end connection of two threaded fittings, which comprises a substantially tubular steel body which is threaded internally; the body is provided with an uninterrupted central rib which acts as a lock and extends (continuously) along a circumference of the body; the central rib is bordered on either side by indentations (or grooves), and has a variable width - i.e. non-uniform along the circumference -; thus, the resistance of the sleeve to tensile stresses as well as the adhesion to the concrete of the sleeve are improved.
  • the imprints bordering the central rib extend along portions of helices having for axis the longitudinal axis of the sleeve.
  • the body is further provided with two uninterrupted end ribs which also act as locks and each extend (continuously) along a (whole) circumference of the body, from - and to neighborhood - one of the two longitudinal ends of the body, these two ribs each having a variable width.
  • a nut for a connection device of two threaded frames which comprises an internally threaded sleeve and having imprints and / or locks on its outer face; the nut is provided with an annular portion - which is arranged to abut against an end face of the sleeve - and a flared portion (substantially frustoconical) which extends from the annular portion, the portion flared being provided with imprints (or notches) at its periphery - on its outer face -, so that the adhesion to the concrete of the nut is improved.
  • the thinning of the wall of the nut - to the right of the flared portion - avoids the formation of crack initiation in the concrete in contact with the nut and the end of the sleeve, especially when the concrete structure in which is incorporated the sleeve and the nut is subjected to significant mechanical stresses, such as shock or vibration.
  • a connecting device for ensuring the end-to-end connection of two threaded fittings which comprises a sleeve whose steel body is substantially tubular, threaded internally, and provided with imprints and / or locks on its external face; the device further comprises two steel nuts which are generally substantially identical, each nut being provided with an annular rib and a flared portion extending from the annular rib, the flared portion being provided with fingerprints. its periphery, so that the adhesion to concrete parts of the device is improved.
  • the connecting sleeve - and / or the nuts - can be manufactured by machining a tube - or tubular blank - of steel, whose diameter and steel grade are adapted to the characteristics of the sleeve ( and / or nuts) to be manufactured, which makes it possible to optimize the geometrical and mechanical characteristics of the sleeve and / or the nuts, and to reduce the losses of energy and material.
  • the connecting sleeve - and / or the nuts - can also be manufactured by forging a blank or blank.
  • the forged couplers / sleeves have increased resistance to fatigue and fracture, with fiber drawing of the steel retained during the shaping process.
  • Forging can also eliminate some brittleness points such as cracks or cracks in the steel used to make the couplers.
  • the invention makes it possible to simply and with good repetitiveness of sleeves and nuts whose characteristics Mechanical and geometric, in particular the geometry of the recessed and raised asperities, are optimized with respect to the constraints of use of the reinforcement connection devices of which they form part.
  • the asperities can extend along portions of circles located in planes perpendicular to the longitudinal axis of the sleeve.
  • the asperities can also extend along portions of helices having as their axis the longitudinal axis of the sleeve.
  • the asperities may have a smooth surface extending along a cylindrical cap; this cap may be delimited by a diamond-shaped contour, or may be delimited by a curvilinear contour, in part at least.
  • the largest dimension of these asperities is preferably greater than one millimeter, for example of the order of one or more centimeters, while the depth (of unevenness) or thickness (of raised asperities) is the order of one or more millimeters.
  • the blanks of these parts may be further subjected to annealing, deburring and / or shot blasting operations.
  • an assembly - such as a cage - reinforcements for concrete, which comprises two steel reinforcing bars whose threaded ends are screwed into a steel sleeve capable of be obtained by a method according to the invention the sleeve having forced asperities on its face external, two forged steel nuts and provided with fingerprints being screwed respectively on the ends of the two bars, respectively bearing against the two longitudinal end faces of the sleeve.
  • the threading of the ends of the bars may have a rounded profile and be obtained by rolling.
  • a structure - such as a cage - reinforcement for a reinforced concrete structure may require the end-to-end connection of two steel reinforcing bars.
  • the respective threaded ends 51, 52 of two bars 25, 26, which are placed facing each other may be connected solely by a threaded sleeve, or by a connecting device 50 incorporating, in addition to a sleeve 20, 23 tapped, one or two nuts 71 as illustrated Figures 7 to 10 .
  • each threaded portion 51, 52 of the bars 25, 26 is at least equal to the sum of the thickness of a nut 71 and the half length of the threaded sleeve 20, these dimensions being measured along the longitudinal axis 49 common to bars, nuts, and sleeve.
  • the mutual connection of the bars 25, 26 is obtained by screwing a nut 71 then a sleeve 20 on the end of the bar 25, screwing a nut 71 on the end of the second bar 26 (cf. figure 7 ), then by screwing the bar 26 in the portion of the threaded portion of the sleeve 20 which has remained free, to arrive at the configuration of the figure 8 .
  • a rigid mutual connection of the bars, nuts, and sleeve 20 is obtained by respectively tightening the two nuts 71 against the two longitudinal ends of the sleeve 20.
  • the sleeve 23 can be screwed on the end 52, without requiring a relative rotation of the bars 25, 26, by partially unscrewing the sleeve of the bar 25.
  • the sleeves 20, 23 have a generally tubular shape, extend along a longitudinal axis 21, and are traversed by a longitudinal passage provided with a cylindrical thread 22 resulting from a tapping.
  • the nature of the steel alloy and the diameter of the blanks used to manufacture the sleeves and nuts are chosen according to the mechanical and geometrical characteristics of the connecting device to be manufactured.
  • the steel constituting the sleeve may have at least one mechanical characteristic distinct from that of the steel constituting the reinforcing bars; in particular, the ductility of the steel constituting the sleeve may be greater than that of the steel constituting the reinforcing bars.
  • a tubular sleeve blank can be obtained by cutting a tube or by forging and drilling, the length of the blank being determined as a function of the length 24 ( figure 2 ) desired for the sleeve.
  • the length 24 of the sleeve may be close to twice the diameter of the bars to be connected by the sleeve.
  • Each of the sleeves 20, 23 and nuts 71 has asperities 27 to 34, 39 to 41, 63 formed on its respective outer face.
  • the body of the sleeve 23 is provided with a central rib 39 which extends along a circumference of the body, on either side of a median transverse plane whose trace in the plane of the figure 4 is identified 48.
  • the central rib 39 is uninterrupted, and bordered on either side by cavities 30, 31 which extend along portions of helices having as their axis the longitudinal axis 21 of the sleeve, so that the central rib 39 has a width - measured parallel to the axis 21 - which varies according to the considered point of the circumference of the body.
  • the body of the sleeve 23 is also provided with two uninterrupted end ribs 40, 41 which each extend along a circumference of the body from one of the two longitudinal ends 75, 76 of the body, and also each a variable width (cf. Figures 3 and 4 ).
  • the body of the sleeve 20 is provided on its substantially cylindrical outer face with relief asperities - or latches - 27 to 29 which extend along portions of circles situated in planes perpendicular to the longitudinal axis 21 of the muff.
  • These locks are separated two by two by recessed asperities which extend along portions of helices having for axis the longitudinal axis 21 of the sleeve, and whose depth 45 is of the order of one or more millimeters .
  • the latches have a quadrilateral facet - particularly diamond-shaped - shape that is curved along the radius of the cylindrical body envelope.
  • the nut 71 consists essentially of an annular portion 61 and a flared portion 62 extending from the annular portion.
  • the portion 61 of the nut has a flat face 81 arranged to abut against a planar end face of a sleeve.
  • the flared portion 62 which extends the annular portion 61 along the longitudinal axis 82 of the nut, is provided with four indentations 63 regularly spaced (90 degrees) at its periphery.
  • the portion 62 is delimited by a frustoconical surface 73 - or chamfer - forming an angle 74 with the axis 82 (cf. figure 6 ).
  • the impressions 63 are substantially cylindrical in shape, of identical dimensions, extend substantially parallel to the axis 82 of the nut, and open on the second end face 85 of the nut which is parallel to the first face 81 end.
  • the fingerprints 63 facilitate the adhesion of the concrete on the outer face of the nut and can be used to screw or unscrew the nut using a tool having several lugs of complementary shape to that of the fingerprints 63.
  • the asperities can be formed on the external surface of a solid blank by forging in two steps.
  • Each matrix comprises a cavity defined by a surface 79 in the general shape of a half-cylinder and in which are cut grooves 67 whose shape corresponds to a portion of the shape of a relief asperity to be formed on the sleeve blank.
  • the inner surface 79 of the dies may comprise ribs whose shape corresponds to a portion of the shape of a hollow asperity to be formed on the sleeve blank.
  • the blank thus obtained can then be drilled and tapped to obtain the sleeve.
  • the asperities can be formed on the outer surface of a solid blank, as well as at least a portion of the central cavity of the nut, by forging in a single step.
  • the matrix 69 comprises a central cavity 77 delimited by a generally cylindrical half-axis surface 89.
  • the second die 68 has a substantially revolution shape along the axis 89, and has a raised central portion 70a whose shape corresponds to at least a portion of the shape of the central cavity to be formed on the nut blank 57. .
  • the die 68 also includes a recessed portion extending around the portion 70a, which has a surface 70b inclined to form the inclined surface 73 of the nut, and projections 70c on the surface 70b to form the indentations 63 on the surface 73 of the nut.
  • the preheated blank 57 is placed between the dies 68, 69 or in the cavity 77, and the dies are brought close together (arrow 100 figure 13 ).
  • the support of the die 68 on the upper face 58 of the blank 57 makes it possible to simultaneously form the flared portion of the nut and at least a portion of the central cavity of the nut.

Abstract

L'invention concerne un manchon (23) pour la liaison bout à bout de deux armatures (25, 26) filetées, qui comporte un corps en acier sensiblement tubulaire qui est fileté intérieurement ; le corps est pourvu d'une nervure centrale (39) qui s'étend le long d'une circonférence du corps, et la nervure centrale est ininterrompue, bordée de part et d'autre d'empreintes (30, 31), et présente une largeur variable le long de la circonférence, et le manchon est traversé par un passage longitudinal fileté (22).The invention relates to a sleeve (23) for the end-to-end connection of two threaded reinforcements (25, 26), which comprises a body of substantially tubular steel which is internally threaded; the body is provided with a central rib (39) which extends along a circumference of the body, and the central rib is uninterrupted, bordered on either side by imprints (30, 31), and has a variable width along the circumference, and the sleeve is crossed by a threaded longitudinal passage (22).

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention est relative à un dispositif de liaison d'armatures, à un procédé de fabrication de tels dispositifs de liaison d'armatures, et aux ensembles d'armatures réalisés avec ces dispositifs.The present invention relates to a reinforcing binding device, to a method of manufacturing such reinforcing binding devices, and to sets of reinforcements made with these devices.

Le domaine technique de l'invention est celui de la fabrication d'armatures en acier pour béton armé.The technical field of the invention is that of the manufacture of reinforcement steel for reinforced concrete.

ETAT DE LA TECHNIQUESTATE OF THE ART

L'invention s'applique notamment aux dispositifs de liaison bout à bout de deux barres d'armature en acier dont les extrémités sont filetées, qui comportent un manchon taraudé qui est vissé sur les extrémités filetées des barres d'armature à rabouter.The invention is particularly applicable to the butt connection devices of two steel reinforcing bars whose ends are threaded, which comprise a threaded sleeve which is screwed onto the threaded ends of the reinforcing bars to be butted.

L'invention permet d'obtenir un tel manchon dont la surface externe comporte des aspérités renforçant l'adhérence du béton - dans lequel le manchon est destiné à être noyé - sur le manchon.The invention makes it possible to obtain such a sleeve whose outer surface has asperities reinforcing the adhesion of the concrete - in which the sleeve is intended to be embedded - on the sleeve.

Il est généralement important d'obtenir une bonne cohésion du béton et des ensembles d'armatures noyés dans le béton, lors de la réalisation d'ouvrages en béton armé tels que des bâtiments ou des ouvrages d'art, afin d'assurer la solidité de ces ouvrages.It is generally important to obtain a good cohesion of the concrete and sets of reinforcements embedded in the concrete, during the realization of reinforced concrete works such as buildings or structures, in order to ensure the solidity of these works.

Cette cohésion résulte notamment de l'adhérence du béton sur les armatures. Cette nécessité est renforcée pour les ouvrages devant résister à des sollicitations dynamiques importantes, telles que des chocs ou vibrations, pendant toute la durée de vie de l'ouvrage.This cohesion results in particular from the adhesion of the concrete on the reinforcements. This need is reinforced for structures that must withstand significant dynamic loads, such as shocks or vibrations, throughout the life of the structure.

Il a été proposé, dans le brevet EP728880 , de fabriquer de tels manchons de raboutage à partir d'armatures dites « à haute adhérence ».It has been proposed in the EP728880 , to manufacture such splicing sleeves from reinforcements called "high adhesion".

De telles barres d'armatures font l'objet de diverses prescriptions et normes telles que les normes NF-A-36-016-1 et EN10080, qui définissent notamment des alliages - ou nuances - d'acier utilisables pour la fabrication de ces armatures, des caractéristiques mécaniques de ces aciers, et des caractéristiques géométriques des armatures.Such reinforcing bars are the subject of various prescriptions and standards such as the NF-A-36-016-1 and EN10080 standards, which in particular define alloys - or grades - of steel that can be used for the manufacture of these reinforcements. , the mechanical characteristics of these steels, and the geometric characteristics of the reinforcements.

Les barres - ou armatures - de ce type présentent des aspérités sur leur surface externe, qui peuvent être saillantes et qualifiées de « verrous », ou au contraire en creux et alors qualifiées d' « empreintes ».Bars - or reinforcements - of this type have asperities on their outer surface, which may be protruding and qualified as "locks", or on the contrary recessed and then called "fingerprints".

La fabrication de manchons de raboutage de barres d'armature à partir de ce type d'armature, par tronçonnage et forage d'une barre pleine, comme proposé dans le brevet EP728880 , présente des inconvénients.The manufacture of reinforcing bar sleeves from this type of reinforcement, by cutting and drilling a solid bar, as proposed in the patent EP728880 has disadvantages.

En effet, l'utilisation de barres conforme à ces normes pour la fabrication de manchons de liaison ne permet pas de choisir la nuance d'acier, le diamètre de barre, et la géométrie des aspérités, qui sont nécessaires pour obtenir des manchons de liaison optimisés en fonction des contraintes propres à chaque utilisation de ces manchons dans un ouvrage à construire.Indeed, the use of bars according to these standards for the manufacture of connecting sleeves does not allow to choose the grade of steel, the diameter of the bar, and the geometry of the asperities, which are necessary to obtain connecting sleeves optimized according to the constraints specific to each use of these sleeves in a structure to be built.

Un autre inconvénient résulte du fait que ces armatures ne présentent généralement pas des caractéristiques mécaniques uniformes dans leur section, en raison notamment de leur procédé de fabrication par laminage.Another disadvantage results from the fact that these reinforcements do not generally have uniform mechanical characteristics in their section, in particular because of their method of manufacture by rolling.

Il peut en résulter que les caractéristiques mécaniques d'un manchon réalisé à partir d'une telle armature ne soient pas adaptées aux caractéristiques des deux armatures qu'il sert à relier, ce qui ne permet pas d'obtenir une liaison optimisée.It can result that the mechanical characteristics of a sleeve made from such a frame are not adapted to the characteristics of the two frames it serves to connect, which does not provide an optimized connection.

Il a également été proposé, dans le brevet US7032286 , de fabriquer de tels manchons par un procédé comportant successivement un traitement thermique d'une ébauche, le forgeage de l'ébauche pour former une première cavité borgne, un second traitement thermique, puis la réalisation d'une seconde cavité borgne par forgeage.It has also been proposed in the US7032286 , to manufacture such sleeves by a process comprising successively a heat treatment of a blank, the forging of the blank to form a first blind cavity, a second heat treatment, then the production of a second blind cavity by forging.

Le manchon ainsi obtenu, qui comporte une cloison séparant les deux cavités, est ensuite rétreint sur les extrémités de deux barres d'armature à assembler, ce rétreint provoquant la formation de nervures sur la face externe du manchon.The sleeve thus obtained, which comprises a partition separating the two cavities, is then narrowed on the ends of two reinforcing bars to be assembled, this necking causing the formation of ribs on the outer face of the sleeve.

Un inconvénient de ce procédé est que la cloison rend difficile l'obtention d'un rétreint uniforme sur la longueur du manchon, et que la rigidité de la liaison formée par rétreint entre le manchon et les barres est difficilement maîtrisable, notamment lorsque le rétreint est réalisé avec un outil portatif. En outre, la suppression de cette cloison nécessiterait une opération supplémentaire.A disadvantage of this method is that the partition makes it difficult to obtain a uniform necking along the length of the sleeve, and that the rigidity of the connection formed by necking between the sleeve and the bars is difficult to control, especially when the shrinkage is achieved with a portable tool. In addition, the removal of this partition would require an additional operation.

Au surplus, le rétreint de la paroi du manchon ne permet pas de maîtriser parfaitement la position et la profondeur des nervures externes destinées à « verrouiller » le manchon au béton qui l'entoure.Moreover, the shrinkage of the wall of the sleeve does not allow to perfectly control the position and the depth of the external ribs intended to "lock" the sleeve to the concrete that surrounds it.

EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION

Un objectif de l'invention est de proposer un manchon de liaison bout à bout de deux armatures d'acier, et un dispositif de liaison incorporant un tel manchon, dont la résistance aux efforts de traction et l'adhérence au béton soient améliorées.An object of the invention is to provide a butt joint of two steel reinforcements, and a connecting device incorporating such a sleeve, the resistance to traction forces and adhesion to concrete are improved.

Un objectif de l'invention est de proposer un procédé de fabrication de dispositifs de liaison d'armatures, des dispositifs de liaison d'armatures obtenus par ce procédé, et des ensembles d'armatures réalisés avec ces dispositifs, qui soient améliorés et/ou qui remédient, en partie au moins, aux lacunes ou inconvénients des systèmes connus de liaison d'armatures.An object of the invention is to propose a method for manufacturing reinforcing bonding devices, reinforcing binding devices obtained by this method, and sets of reinforcements made with these devices, which are improved and / or which remedy, at least in part, the shortcomings or disadvantages of the known reinforcement bonding systems.

Selon un aspect de l'invention, il est proposé un manchon de liaison permettant d'assurer la liaison bout à bout de deux armatures filetées, qui comporte un corps en acier sensiblement tubulaire qui est fileté intérieurement ; le corps est pourvu d'une nervure centrale ininterrompue qui fait office de verrou et s'étend (continûment) le long d'une circonférence du corps ; la nervure centrale est bordée de part et d'autre d'empreintes (ou rainures), et présente une largeur variable - i.e. non uniforme le long de la circonférence - ; ainsi, la résistance du manchon aux efforts de traction ainsi que l'adhérence au béton du manchon sont améliorées.According to one aspect of the invention, there is provided a connecting sleeve for ensuring the end-to-end connection of two threaded fittings, which comprises a substantially tubular steel body which is threaded internally; the body is provided with an uninterrupted central rib which acts as a lock and extends (continuously) along a circumference of the body; the central rib is bordered on either side by indentations (or grooves), and has a variable width - i.e. non-uniform along the circumference -; thus, the resistance of the sleeve to tensile stresses as well as the adhesion to the concrete of the sleeve are improved.

Selon un mode de réalisation, les empreintes bordant la nervure centrale s'étendent le long de portions d'hélices ayant pour axe l'axe longitudinal du manchon.According to one embodiment, the imprints bordering the central rib extend along portions of helices having for axis the longitudinal axis of the sleeve.

Selon un mode de réalisation, le corps est en outre pourvu de deux nervures d'extrémité ininterrompues qui font également office de verrou et s'étendent chacune (continûment) le long d'une (entière) circonférence du corps, à partir - et au voisinage - d'une des deux extrémités longitudinales du corps, ces deux nervures présentant chacune une largeur variable.According to one embodiment, the body is further provided with two uninterrupted end ribs which also act as locks and each extend (continuously) along a (whole) circumference of the body, from - and to neighborhood - one of the two longitudinal ends of the body, these two ribs each having a variable width.

Selon un autre aspect de l'invention, il est proposé un écrou pour un dispositif de liaison de deux armatures filetées qui comporte un manchon fileté intérieurement et doté d'empreintes et/ou verrous sur sa face externe ; l'écrou est pourvu d'une portion annulaire - qui est arrangée pour venir en appui contre une face d'extrémité du manchon - et d'une portion évasée (sensiblement tronconique) qui s'étend à partir de la portion annulaire, la portion évasée étant pourvue d'empreintes (ou encoches) à sa périphérie - sur sa face externe -, de sorte que l'adhérence au béton de l'écrou est améliorée.According to another aspect of the invention, there is provided a nut for a connection device of two threaded frames which comprises an internally threaded sleeve and having imprints and / or locks on its outer face; the nut is provided with an annular portion - which is arranged to abut against an end face of the sleeve - and a flared portion (substantially frustoconical) which extends from the annular portion, the portion flared being provided with imprints (or notches) at its periphery - on its outer face -, so that the adhesion to the concrete of the nut is improved.

Par ailleurs, l'amincissement de la paroi de l'écrou - au droit de la portion évasée - permet d'éviter la formation d'amorces de fissures dans le béton en contact avec l'écrou et l'extrémité du manchon, notamment lorsque l'ouvrage en béton dans lequel est incorporé le manchon et l'écrou est soumis à des sollicitations mécaniques importantes, telles que des chocs ou vibrations.Furthermore, the thinning of the wall of the nut - to the right of the flared portion - avoids the formation of crack initiation in the concrete in contact with the nut and the end of the sleeve, especially when the concrete structure in which is incorporated the sleeve and the nut is subjected to significant mechanical stresses, such as shock or vibration.

Selon un autre aspect de l'invention, il est proposé un dispositif de liaison permettant d'assurer la liaison bout à bout de deux armatures filetées, qui comporte un manchon dont le corps en acier est sensiblement tubulaire, fileté intérieurement, et doté d'empreintes et/ou verrous sur sa face externe ; le dispositif comporte en outre deux écrous en acier qui sont généralement sensiblement identiques, chaque écrou étant pourvu d'une nervure annulaire et d'une portion évasée qui s'étend à partir de la nervure annulaire, la portion évasée étant pourvue d'empreintes à sa périphérie, de sorte que l'adhérence au béton des pièces du dispositif est améliorée.According to another aspect of the invention, there is provided a connecting device for ensuring the end-to-end connection of two threaded fittings, which comprises a sleeve whose steel body is substantially tubular, threaded internally, and provided with imprints and / or locks on its external face; the device further comprises two steel nuts which are generally substantially identical, each nut being provided with an annular rib and a flared portion extending from the annular rib, the flared portion being provided with fingerprints. its periphery, so that the adhesion to concrete parts of the device is improved.

Le manchon de liaison - et/ou les écrous - peut (peuvent) être fabriqué(s) par usinage d'un tube - ou ébauche tubulaire - en acier, dont le diamètre et la nuance d'acier sont adaptés aux caractéristiques du manchon (et/ou des écrous) à fabriquer, ce qui permet d'optimiser les caractéristiques géométriques et mécaniques du manchon et/ou des écrous, et de réduire les pertes d'énergie et de matière.The connecting sleeve - and / or the nuts - can be manufactured by machining a tube - or tubular blank - of steel, whose diameter and steel grade are adapted to the characteristics of the sleeve ( and / or nuts) to be manufactured, which makes it possible to optimize the geometrical and mechanical characteristics of the sleeve and / or the nuts, and to reduce the losses of energy and material.

Le manchon de liaison - et/ou les écrous - peut (peuvent) également être fabriqué(s) par forgeage d'une ébauche ou lopin.The connecting sleeve - and / or the nuts - can also be manufactured by forging a blank or blank.

Selon un autre aspect de l'invention, il est proposé un procédé de fabrication d'un manchon - respectivement d'un écrou - de raboutage d'armatures en acier pour un ouvrage en béton armé, qui comporte les opérations suivantes :

  • former des aspérités sur la surface externe d'une ébauche en acier, qui est généralement pleine, par forgeage,
  • former une cavité cylindrique traversant l'ébauche forgée, et
  • tarauder la cavité cylindrique.
According to another aspect of the invention, there is provided a method of manufacturing a sleeve - respectively a nut - of reinforcing steel reinforcement for a reinforced concrete structure, which comprises the following operations:
  • forming asperities on the outer surface of a steel blank, which is generally solid, by forging,
  • forming a cylindrical cavity passing through the forged blank, and
  • tapping the cylindrical cavity.

Ceci permet d'obtenir un manchon fileté intérieurement - respectivement un écrou - dont la résistance aux efforts mécaniques et l'adhérence au béton sont améliorées.This makes it possible to obtain an internally threaded sleeve - respectively a nut - whose resistance to mechanical stresses and adhesion to concrete are improved.

En particulier, les coupleurs/manchons forgés présentent une résistance accrue à la fatigue et à la rupture, avec un fibrage de l'acier conservé lors du processus de mise en forme.In particular, the forged couplers / sleeves have increased resistance to fatigue and fracture, with fiber drawing of the steel retained during the shaping process.

Le forgeage peut également permettre d'éliminer certains points de fragilité comme des fissures ou criques présentes dans l'acier utilisé pour la fabrication des coupleurs.Forging can also eliminate some brittleness points such as cracks or cracks in the steel used to make the couplers.

Selon des modes de réalisation de l'invention :

  • la formation de la cavité cylindrique dans l'ébauche d'un manchon peut être obtenue par un forage longitudinal de l'ébauche forgée;
  • la formation de la cavité cylindrique dans l'ébauche d'un écrou peut être obtenue, en partie au moins, par forgeage, simultanément ou consécutivement à la formation - par forgeage - d'une portion évasée de l'écrou et/ou d'empreintes en creux sur cette portion évasée;
  • l'ébauche peut être chauffée jusqu'à atteindre une température qui est au moins égale à 400 °C environ, en particulier une température située dans une plage allant de 400 °C environ à 1000 °C environ;
  • alternativement, l'opération de forgeage peut être réalisée à froid ;
  • l'opération de forgeage d'un manchon et/ou d'un écrou peut être réalisée en plusieurs étapes, en utilisant un jeu de matrices spécifique à chaque étape, i.e. en utilisant plusieurs jeux distincts de matrices ;
  • on peut marquer la surface externe du manchon/écrou, par enlèvement de matière ou par forgeage, de façon à former - en creux ou en relief - des signes permettant d'identifier des caractéristiques du manchon/écrou telles que des caractéristiques de l'acier le constituant, et/ou des caractéristiques d'identification du fabricant du manchon/écrou ; cette opération de marquage peut être réalisée sensiblement simultanément aux opérations de forgeage et de formation des aspérités ;
  • le marquage de la surface externe du manchon ou de l'écrou peut également comporter une opération de dépôt de matière sur cette surface ;
  • on peut fabriquer les manchons à partir d'un acier présentant une limite d'élasticité située dans une plage allant de 200 méga Pascal (200 MPa) environ à 1000 MPa environ, en particulier un acier présentant une limite d'élasticité située dans une plage allant de 400 MPa environ à 600 MPa environ ;
  • on peut fabriquer les manchons à partir d'un acier présentant un allongement sous charge maximale situé dans une plage allant de 1% environ à 10% environ, en particulier un acier présentant un allongement sous charge maximale situé dans une plage allant de 3% environ à 7% environ.
According to embodiments of the invention:
  • the formation of the cylindrical cavity in the blank of a sleeve can be obtained by longitudinal drilling of the forged blank;
  • the formation of the cylindrical cavity in the blank of a nut can be obtained, at least partly, by forging, simultaneously or subsequent to the formation - by forging - of a flared portion of the nut and / or indentations on this flared portion;
  • the blank may be heated to a temperature of at least about 400 ° C, in particular a temperature in the range of about 400 ° C to about 1000 ° C;
  • alternatively, the forging operation can be performed cold;
  • the forging operation of a sleeve and / or a nut can be performed in several steps, using a set of dies specific to each step, ie by using several distinct sets of dies;
  • the outer surface of the sleeve / nut can be marked by material removal or forging so as to form - in relief or in relief - signs making it possible to identify characteristics of the sleeve / nut such as characteristics of the steel the constituent, and / or identifying characteristics of the manufacturer of the sleeve / nut; this marking operation can be performed substantially simultaneously forging operations and forming asperities;
  • marking the outer surface of the sleeve or the nut may also include a material deposition operation on this surface;
  • the sleeves can be made from a steel with a yield strength in the range of about 200 mega Pascal (200 MPa) to about 1000 MPa, particularly a steel having a yield strength within a range of from about 400 MPa to about 600 MPa;
  • the sleeves may be made from a steel having a maximum load elongation in a range of from about 1% to about 10%, particularly a steel having a maximum load elongation in a range of about 3% about 7%.

L'invention permet de réaliser simplement et avec une bonne répétitivité des manchons et des écrous dont les caractéristiques mécaniques et géométriques, en particulier la géométrie des aspérités en creux et en relief, sont optimisées par rapport aux contraintes d'utilisation des dispositifs de liaison d'armatures dont ils font partie.The invention makes it possible to simply and with good repetitiveness of sleeves and nuts whose characteristics Mechanical and geometric, in particular the geometry of the recessed and raised asperities, are optimized with respect to the constraints of use of the reinforcement connection devices of which they form part.

On peut former, à la surface d'un manchon, un réseau d'aspérités de forme allongée et effilée à leurs deux extrémités, de dimensions identiques, qui sont régulièrement disposées/espacées sur la surface externe (sensiblement cylindrique) du manchon.It is possible to form, on the surface of a sleeve, a network of asperities of elongated and tapered shape at their two ends, of identical dimensions, which are regularly arranged / spaced apart on the outer (substantially cylindrical) surface of the sleeve.

Les aspérités peuvent s'étendre le long de portions de cercles situés dans des plans perpendiculaires à l'axe longitudinal du manchon.The asperities can extend along portions of circles located in planes perpendicular to the longitudinal axis of the sleeve.

Les aspérités peuvent également s'étendre le long de portions d'hélices ayant pour axe l'axe longitudinal du manchon.The asperities can also extend along portions of helices having as their axis the longitudinal axis of the sleeve.

Les aspérités peuvent présenter une surface lisse s'étendant selon une calotte cylindrique ; cette calotte peut être délimitée par un contour en forme de losange, ou bien peut être délimitée par un contour curviligne, en partie au moins.The asperities may have a smooth surface extending along a cylindrical cap; this cap may be delimited by a diamond-shaped contour, or may be delimited by a curvilinear contour, in part at least.

La plus grande dimension de ces aspérités est de préférence supérieure à un millimètre, par exemple de l'ordre d'un ou plusieurs centimètres, tandis que la profondeur (d'aspérités en creux) ou épaisseur (d'aspérités en relief) est de l'ordre d'un ou plusieurs millimètres.The largest dimension of these asperities is preferably greater than one millimeter, for example of the order of one or more centimeters, while the depth (of unevenness) or thickness (of raised asperities) is the order of one or more millimeters.

On peut en outre former des (micro)aspérités de taille voisine de un millimètre, ou inférieure à cette valeur , par enlèvement de matière également, par déformation de la surface externe de l'ébauche, ou bien par dépôt de matière sur la surface externe du manchon et/ou de l'écrou.It is also possible to form (micro) asperities of size close to one millimeter, or less than this value, by removal of material also, by deformation of the external surface of the blank, or by deposition of material on the external surface. sleeve and / or nut.

Selon les caractéristiques recherchées pour le manchon et/ou l'écrou, les ébauches de ces pièces pourront être soumises en outre à des opérations de recuit, d'ébavurage, et/ou de grenaillage.Depending on the characteristics desired for the sleeve and / or the nut, the blanks of these parts may be further subjected to annealing, deburring and / or shot blasting operations.

Selon un autre aspect de l'invention, il est proposé un ensemble - tel qu'une cage - d'armatures pour béton, qui comporte deux barres d'armature en acier dont les extrémités filetées sont vissées dans un manchon en acier susceptible d'être obtenu par un procédé selon l'invention le manchon comportant des aspérités forcées sur sa face externe, deux écrous en acier forgés et pourvu d'empreintes étant respectivement vissés sur les extrémités des deux barres, en appui respectif contre les deux faces d'extrémité longitudinale du manchon.According to another aspect of the invention, there is provided an assembly - such as a cage - reinforcements for concrete, which comprises two steel reinforcing bars whose threaded ends are screwed into a steel sleeve capable of be obtained by a method according to the invention the sleeve having forced asperities on its face external, two forged steel nuts and provided with fingerprints being screwed respectively on the ends of the two bars, respectively bearing against the two longitudinal end faces of the sleeve.

Selon un mode de réalisation, le filetage des extrémités des barres peut présenter un profil arrondi et être obtenu par roulage.According to one embodiment, the threading of the ends of the bars may have a rounded profile and be obtained by rolling.

D'autres aspects, caractéristiques, et avantages de l'invention apparaissent dans la description suivante qui se réfère aux figures annexées et illustre, sans aucun caractère limitatif, des modes préférés de réalisation de l'invention.Other aspects, features, and advantages of the invention appear in the following description which refers to the appended figures and illustrates, without any limiting character, preferred embodiments of the invention.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

  • La figure 1 illustre en perspective un manchon selon un mode de réalisation de l'invention.The figure 1 illustrates in perspective a sleeve according to one embodiment of the invention.
  • La figure 2 illustre le manchon de la figure 1 en vue en coupe longitudinale.The figure 2 illustrates the sleeve of the figure 1 in longitudinal section view.
  • La figure 3 illustre en perspective un manchon selon un autre mode de réalisation de l'invention.The figure 3 illustrates in perspective a sleeve according to another embodiment of the invention.
  • La figure 4 illustre le manchon de la figure 3 en vue en coupe longitudinale.The figure 4 illustrates the sleeve of the figure 3 in longitudinal section view.
  • La figure 5 illustre en perspective un écrou susceptible de coopérer avec un manchon tel que ceux illustrés figures 1 à 4, pour former un dispositif de liaison tel que ceux illustrés figures 7 à 10, selon un mode de réalisation de l'invention.The figure 5 illustrates in perspective a nut capable of cooperating with a sleeve such as those illustrated Figures 1 to 4 , to form a connecting device such as those illustrated Figures 7 to 10 according to one embodiment of the invention.
  • La figure 6 illustre l'écrou de la figure 5 en vue en coupe longitudinale.The figure 6 illustrates the nut of the figure 5 in longitudinal section view.
  • Les figures 7 et 8 illustrent une portion d'un ensemble d'armatures selon un mode de réalisation de l'invention, dans deux configurations : dans la configuration correspondant à la figure 7, deux écrous de blocage ont été vissés sur les extrémités filetées respectives de deux armatures, et un manchon a été vissé sur l'extrémité filetée d'une première des deux armatures ; dans la configuration correspondant à la figure 8, le manchon a été en outre vissé sur l'extrémité filetée de la seconde armature.The Figures 7 and 8 illustrate a portion of a set of reinforcements according to one embodiment of the invention, in two configurations: in the configuration corresponding to the figure 7 two locking nuts were screwed onto the respective threaded ends of two frames, and a sleeve was screwed onto the threaded end of a first of the two frames; in the configuration corresponding to the figure 8 , the sleeve has been further screwed onto the threaded end of the second frame.
  • Les figures 9 et 10 illustrent une portion d'un ensemble d'armatures selon un autre mode de réalisation de l'invention, dans deux configurations respectivement similaires à celles des figures 7 et 8.The Figures 9 and 10 illustrate a portion of a set of reinforcements according to another embodiment of the invention, in two configurations respectively similar to those of Figures 7 and 8 .
  • Les figures 11 et 12 illustrent schématiquement deux étapes d'un procédé de fabrication d'un manchon par forgeage, selon un mode de réalisation de l'invention.The Figures 11 and 12 schematically illustrate two steps of a method of manufacturing a sleeve by forging, according to one embodiment of the invention.
  • Les figures 13 et 14 illustrent schématiquement deux étapes d'un procédé de fabrication d'un écrou par forgeage, selon un mode de réalisation de l'invention.The Figures 13 and 14 schematically illustrate two steps of a method of manufacturing a nut by forging, according to one embodiment of the invention.
DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Sauf indication explicite ou implicite contraire, des éléments ou organes - structurellement ou fonctionnellement - identiques ou similaires, sont désignés par des repères identiques sur les différentes figures.Unless otherwise explicitly or implicitly stated, elements or members - structurally or functionally identical or similar - are designated by identical reference numerals in the different figures.

La réalisation d'une structure - telle qu'une cage - d'armature pour un ouvrage en béton armé peut nécessiter la liaison bout à bout de deux barres d'armature en acier.The realization of a structure - such as a cage - reinforcement for a reinforced concrete structure may require the end-to-end connection of two steel reinforcing bars.

A cet effet, les extrémités filetées 51, 52 respectives de deux barres 25, 26, qui sont placées en regard mutuel, peuvent être liées uniquement par un manchon taraudé, ou bien par un dispositif 50 de liaison incorporant, outre un manchon 20, 23 taraudé, un ou deux écrous 71 comme illustré figures 7 à 10.For this purpose, the respective threaded ends 51, 52 of two bars 25, 26, which are placed facing each other, may be connected solely by a threaded sleeve, or by a connecting device 50 incorporating, in addition to a sleeve 20, 23 tapped, one or two nuts 71 as illustrated Figures 7 to 10 .

Dans les configurations illustrées figures 7 et 8 la longueur de chaque partie filetée 51, 52 des barres 25, 26 est au moins égale à la somme de l'épaisseur d'un écrou 71 et de la demi longueur du manchon fileté 20, ces dimensions étant mesurées selon l'axe 49 longitudinal commun aux barres, écrous, et manchon.In the illustrated configurations Figures 7 and 8 the length of each threaded portion 51, 52 of the bars 25, 26 is at least equal to the sum of the thickness of a nut 71 and the half length of the threaded sleeve 20, these dimensions being measured along the longitudinal axis 49 common to bars, nuts, and sleeve.

La liaison mutuelle des barres 25, 26 est obtenue en vissant un écrou 71 puis un manchon 20 sur l'extrémité de la barre 25, en vissant un écrou 71 sur l'extrémité de la seconde barre 26 (cf. figure 7), puis en vissant la barre 26 dans la portion de la partie filetée du manchon 20 qui est restée libre, pour aboutir à la configuration de la figure 8.The mutual connection of the bars 25, 26 is obtained by screwing a nut 71 then a sleeve 20 on the end of the bar 25, screwing a nut 71 on the end of the second bar 26 (cf. figure 7 ), then by screwing the bar 26 in the portion of the threaded portion of the sleeve 20 which has remained free, to arrive at the configuration of the figure 8 .

Une liaison mutuelle rigide des barres, des écrous, et du manchon 20 est obtenue en serrant respectivement les deux écrous 71 contre les deux extrémités longitudinales du manchon 20.A rigid mutual connection of the bars, nuts, and sleeve 20 is obtained by respectively tightening the two nuts 71 against the two longitudinal ends of the sleeve 20.

Par comparaison avec les figures 7 et 8, la partie 51 filetée de la barre 25 illustrée figures 9 et 10 est plus longue de sorte que, comme illustré figure 9, un écrou 71 et la quasi-totalité du manchon 23 peuvent être engagés (vissés) sur cette partie 51.In comparison with Figures 7 and 8 , the threaded portion 51 of the illustrated bar 25 Figures 9 and 10 is longer so that as illustrated figure 9 , a nut 71 and almost all of the sleeve 23 can be engaged (screwed) on this part 51.

Après qu'un écrou 71 ait été vissé sur l'extrémité 52 de la barre 26, les extrémités 51 et 52 étant placées en alignement mutuel - et sensiblement en contact mutuel, le manchon 23 peut être vissé sur l'extrémité 52, sans nécessiter une rotation relative des barres 25, 26, en dévissant partiellement le manchon de la barre 25.After a nut 71 has been screwed onto the end 52 of the bar 26, the ends 51 and 52 being placed in mutual alignment - and substantially in mutual contact, the sleeve 23 can be screwed on the end 52, without requiring a relative rotation of the bars 25, 26, by partially unscrewing the sleeve of the bar 25.

On aboutit ensuite à la configuration illustrée figure 10 en serrant les deux écrous 71 contre le manchon 23.We then come to the illustrated configuration figure 10 by tightening the two nuts 71 against the sleeve 23.

Par référence aux figures 1 à 4 notamment, les manchons 20, 23 présentent une forme générale tubulaire, s'étendent selon un axe longitudinal 21, et sont traversés par un passage longitudinal pourvu d'un filetage cylindrique 22 résultant d'un taraudage.By reference to Figures 1 to 4 in particular, the sleeves 20, 23 have a generally tubular shape, extend along a longitudinal axis 21, and are traversed by a longitudinal passage provided with a cylindrical thread 22 resulting from a tapping.

La nature de l'alliage d'acier et le diamètre des ébauches utilisées pour fabriquer les manchons et écrous sont choisis en fonction des caractéristiques mécaniques et géométriques du dispositif de liaison à fabriquer. L'acier constituant le manchon peut présenter au moins une caractéristique mécanique distincte de celle de l'acier constituant les barres d'armature; en particulier, la ductilité de l'acier constituant le manchon peut être supérieure à celle de l'acier constituant les barres d'armatures.The nature of the steel alloy and the diameter of the blanks used to manufacture the sleeves and nuts are chosen according to the mechanical and geometrical characteristics of the connecting device to be manufactured. The steel constituting the sleeve may have at least one mechanical characteristic distinct from that of the steel constituting the reinforcing bars; in particular, the ductility of the steel constituting the sleeve may be greater than that of the steel constituting the reinforcing bars.

Une ébauche tubulaire de manchon peut être obtenue par tronçonnage d'un tube ou bien par forgeage et forage, la longueur de l'ébauche étant déterminée en fonction de la longueur 24 (figure 2) souhaitée pour le manchon.A tubular sleeve blank can be obtained by cutting a tube or by forging and drilling, the length of the blank being determined as a function of the length 24 ( figure 2 ) desired for the sleeve.

La longueur 24 du manchon peut être voisine du double du diamètre des barres à relier par le manchon.The length 24 of the sleeve may be close to twice the diameter of the bars to be connected by the sleeve.

Chacun des manchons 20, 23 et des écrous 71 comporte des aspérités 27 à 34, 39 à 41, 63 formées sur sa face externe respective.Each of the sleeves 20, 23 and nuts 71 has asperities 27 to 34, 39 to 41, 63 formed on its respective outer face.

Dans le mode de réalisation illustré figures 3, 4, 9, et 10, le corps du manchon 23 est pourvu d'une nervure centrale 39 qui s'étend le long d'une circonférence du corps, de part et d'autre d'un plan transversal médian dont la trace dans le plan de la figure 4 est repérée 48.In the illustrated embodiment Figures 3, 4 , 9, and 10 , the body of the sleeve 23 is provided with a central rib 39 which extends along a circumference of the body, on either side of a median transverse plane whose trace in the plane of the figure 4 is identified 48.

La nervure centrale 39 est ininterrompue, et bordée de part et d'autre d'empreintes 30, 31 qui s'étendent le long de portions d'hélices ayant pour axe l'axe longitudinal 21 du manchon, de sorte que la nervure centrale 39 présente une largeur - mesurée parallèlement à l'axe 21 - qui varie selon le point considéré de la circonférence du corps.The central rib 39 is uninterrupted, and bordered on either side by cavities 30, 31 which extend along portions of helices having as their axis the longitudinal axis 21 of the sleeve, so that the central rib 39 has a width - measured parallel to the axis 21 - which varies according to the considered point of the circumference of the body.

Le corps du manchon 23 est également pourvu de deux nervures 40, 41 ininterrompues d'extrémité qui s'étendent chacune le long d'une circonférence du corps à partir d'une des deux extrémités 75, 76 longitudinales du corps, et présentent également chacune une largeur variable (cf. figures 3 et 4).The body of the sleeve 23 is also provided with two uninterrupted end ribs 40, 41 which each extend along a circumference of the body from one of the two longitudinal ends 75, 76 of the body, and also each a variable width (cf. Figures 3 and 4 ).

Dans le mode de réalisation illustré figures 1, 2, 7, et 8, le corps du manchon 20 est muni, sur sa face externe sensiblement cylindrique, d'aspérités en relief - ou verrous - 27 à 29 qui s'étendent le long de portions de cercles situés dans des plans perpendiculaires à l'axe longitudinal 21 du manchon.In the illustrated embodiment Figures 1, 2 , 7, and 8 , the body of the sleeve 20 is provided on its substantially cylindrical outer face with relief asperities - or latches - 27 to 29 which extend along portions of circles situated in planes perpendicular to the longitudinal axis 21 of the muff.

Ces verrous sont séparés deux à deux par des aspérités en creux qui s'étendent le long de portions d'hélices ayant pour axe l'axe longitudinal 21 du manchon, et dont la profondeur 45 est de l'ordre d'un ou plusieurs millimètres.These locks are separated two by two by recessed asperities which extend along portions of helices having for axis the longitudinal axis 21 of the sleeve, and whose depth 45 is of the order of one or more millimeters .

Il en résulte que les verrous présentent une forme de facette quadrilatère - en particulier en forme de losange - qui est incurvée selon le rayon de l'enveloppe cylindrique du corps.As a result, the latches have a quadrilateral facet - particularly diamond-shaped - shape that is curved along the radius of the cylindrical body envelope.

Par référence aux figures 5 et 6 notamment, l'écrou 71 est essentiellement constitué d'une portion 61 annulaire et d'une portion 62 évasée qui s'étend à partir de la portion annulaire.By reference to Figures 5 and 6 in particular, the nut 71 consists essentially of an annular portion 61 and a flared portion 62 extending from the annular portion.

La portion 61 de l'écrou présente une face plane 81 arrangée pour venir en appui contre une face plane d'extrémité d'un manchon.The portion 61 of the nut has a flat face 81 arranged to abut against a planar end face of a sleeve.

La portion 62 évasée, qui prolonge la portion annulaire 61 le long de l'axe longitudinal 82 de l'écrou, est pourvue de quatre empreintes 63 régulièrement espacées (de 90 degrés) à sa périphérie. La portion 62 est délimitée par une surface 73 tronconique - ou chanfrein - formant un angle 74 avec l'axe 82 (cf. figure 6).The flared portion 62, which extends the annular portion 61 along the longitudinal axis 82 of the nut, is provided with four indentations 63 regularly spaced (90 degrees) at its periphery. The portion 62 is delimited by a frustoconical surface 73 - or chamfer - forming an angle 74 with the axis 82 (cf. figure 6 ).

Les empreintes 63 sont de forme sensiblement cylindrique, de dimensions identiques, s'étendent sensiblement parallèlement à l'axe 82 de l'écrou, et débouchent sur la seconde face 85 d'extrémité de l'écrou qui est parallèle à la première face 81 d'extrémité.The impressions 63 are substantially cylindrical in shape, of identical dimensions, extend substantially parallel to the axis 82 of the nut, and open on the second end face 85 of the nut which is parallel to the first face 81 end.

Les empreintes 63 facilitent l'adhésion du béton sur la face externe de l'écrou et peuvent être utilisées pour visser ou dévisser l'écrou à l'aide d'un outil comportant plusieurs ergots de forme complémentaire à celle des empreintes 63.The fingerprints 63 facilitate the adhesion of the concrete on the outer face of the nut and can be used to screw or unscrew the nut using a tool having several lugs of complementary shape to that of the fingerprints 63.

Pour la fabrication d'un manchon, on peut former les aspérités sur la surface externe d'une ébauche pleine, par forgeage en deux étapes.For the manufacture of a sleeve, the asperities can be formed on the external surface of a solid blank by forging in two steps.

Par référence à la figure 11, on utilise une paire de matrices 65 de forme sensiblement identique. Chaque matrice comporte une cavité délimitée par une surface 79 en forme générale de demi cylindre et dans laquelle sont creusées des rainures 67 dont la forme correspond à une partie de la forme d'une aspérité en relief à former sur l'ébauche de manchon.By reference to the figure 11 a pair of dies 65 of substantially identical shape is used. Each matrix comprises a cavity defined by a surface 79 in the general shape of a half-cylinder and in which are cut grooves 67 whose shape corresponds to a portion of the shape of a relief asperity to be formed on the sleeve blank.

Alternativement, la surface interne 79 des matrices peut comporter des nervures dont la forme correspond à une partie de la forme d'une aspérité en creux à former sur l'ébauche de manchon.Alternatively, the inner surface 79 of the dies may comprise ribs whose shape corresponds to a portion of the shape of a hollow asperity to be formed on the sleeve blank.

Les surfaces 79 des matrices 65 s'étendant parallèlement à l'axe longitudinal 59 de l'ébauche 55 préalablement chauffée, les matrices sont placées au contact de l'ébauche 55 par un mouvement selon les flèches 53, et sont mises en appui sur la surface externe 56 de l'ébauche afin que les aspérités 67 des matrices provoquent la formation d'aspérités sur l'ébauche 55 telles que celles repérées 28 figure 12.The surfaces 79 of the matrices 65 extending parallel to the longitudinal axis 59 of the previously heated blank 55, the dies are placed in contact with the blank 55 by a movement according to the arrows 53, and are placed in abutment on the external surface 56 of the blank so that the asperities 67 of the dies cause the formation of asperities on the blank 55 such as those identified 28 figure 12 .

Par référence à la figure 12, dans une seconde étape de forgeage, on utilise une seconde paire de matrices 66 similaires aux premières matrices 65 mais de forme sensiblement différente, que l'on presse selon les flèches 54 contre l'ébauche pré formée afin d'obtenir à la surface de l'ébauche des aspérités ayant la forme finale souhaitée.By reference to the figure 12 in a second forging step, using a second pair of dies 66 similar to the first dies 65 but of substantially different shape, which is pressed according to the arrows 54 against the preform formed to obtain on the surface of the draft of the asperities having the desired final shape.

On peut ensuite forer et tarauder l'ébauche ainsi obtenue pour obtenir le manchon.The blank thus obtained can then be drilled and tapped to obtain the sleeve.

Pour la fabrication d'un écrou, on peut former les aspérités sur la surface externe d'une ébauche pleine, ainsi qu'une partie au moins de la cavité centrale de l'écrou, par forgeage en une seule étape.For the manufacture of a nut, the asperities can be formed on the outer surface of a solid blank, as well as at least a portion of the central cavity of the nut, by forging in a single step.

Par référence aux figures 13 et 14, on utilise une paire de matrices 68, 69. La matrice 69 comporte une cavité centrale 77 délimitée par une surface en forme générale de demi cylindre d'axe 89.By reference to Figures 13 and 14 a matrix pair 69, 69 is used. The matrix 69 comprises a central cavity 77 delimited by a generally cylindrical half-axis surface 89.

La seconde matrice 68 présente une forme sensiblement de révolution selon l'axe 89, et comporte une partie centrale 70a en relief dont la forme correspond à une partie au moins de la forme de la cavité centrale à former sur l'ébauche 57 d'écrou.The second die 68 has a substantially revolution shape along the axis 89, and has a raised central portion 70a whose shape corresponds to at least a portion of the shape of the central cavity to be formed on the nut blank 57. .

La matrice 68 comporte également une partie en creux s'étendant autour de la partie 70a, qui comporte une surface 70b inclinée pour former la surface 73 inclinée de l'écrou, et des saillies 70c sur la surface 70b pour former les empreintes 63 sur la surface 73 de l'écrou.The die 68 also includes a recessed portion extending around the portion 70a, which has a surface 70b inclined to form the inclined surface 73 of the nut, and projections 70c on the surface 70b to form the indentations 63 on the surface 73 of the nut.

L'ébauche 57 préalablement chauffée est placée entre les matrices 68, 69 ou dans la cavité 77, et les matrices sont rapprochées (flèche 100 figure 13). L'appui de la matrice 68 sur la face supérieure 58 de l'ébauche 57 permet de former simultanément la portion évasée de l'écrou et une partie au moins de la cavité centrale de l'écrou.The preheated blank 57 is placed between the dies 68, 69 or in the cavity 77, and the dies are brought close together (arrow 100 figure 13 ). The support of the die 68 on the upper face 58 of the blank 57 makes it possible to simultaneously form the flared portion of the nut and at least a portion of the central cavity of the nut.

Claims (10)

Manchon (23) pour la liaison bout à bout de deux armatures (25, 26) filetées, qui comporte un corps en acier sensiblement tubulaire qui est fileté intérieurement, caractérisé en ce que le corps est pourvu d'une nervure centrale (39) qui s'étend le long d'une circonférence du corps, en ce que la nervure centrale est ininterrompue, bordée de part et d'autre d'empreintes (30, 31), et présente une largeur variable le long de la circonférence, et en ce que le manchon est traversé par un passage longitudinal fileté (22).Sleeve (23) for the butt connection of two threaded frames (25, 26), which comprises a substantially tubular steel body which is threaded internally, characterized in that the body is provided with a central rib (39) which extends along a circumference of the body, in that the central rib is continuous, lined on either side of recesses (30, 31), and has a variable width along the circumference, and that the sleeve is traversed by a threaded longitudinal passage (22). Manchon selon la revendication 1 dans lequel les empreintes bordant la nervure centrale s'étendent le long de portions d'hélices ayant pour axe l'axe longitudinal du manchon.Sleeve according to claim 1 wherein the imprints bordering the central rib extend along helical portions having for axis the longitudinal axis of the sleeve. Manchon selon la revendication 1 ou 2 dans lequel le corps est pourvu de deux nervures (40, 41) ininterrompues d'extrémité qui s'étendent chacune le long d'une circonférence du corps à partir d'une des deux extrémités (75, 76) longitudinales du corps, et présentent chacune une largeur variable.A sleeve according to claim 1 or 2 wherein the body is provided with two uninterrupted end ribs (40,41) each extending along a circumference of the body from one of the two ends (75,76). ) longitudinal of the body, and each have a variable width. Dispositif (50) de liaison permettant d'assurer la liaison bout à bout de deux armatures (25, 26) filetées, qui comporte un manchon (20, 23) selon l'une quelconque des revendications 1 à 3, le dispositif de liaison comportant en outre un ou deux écrous (71) qui est (sont) pourvu(s) d'une portion (61) annulaire arrangée pour venir en appui contre une face d'extrémité (75, 76) du manchon.Connecting device (50) for providing the end-to-end connection of two threaded reinforcements (25, 26), which comprises a sleeve (20, 23) according to any one of claims 1 to 3, the connecting device comprising in addition one or two nuts (71) which is (are) provided with an annular portion (61) arranged to abut against an end face (75, 76) of the sleeve. Dispositif, selon la revendication 4 dans lequel l'écrou (les écrous) (71) est (sont) pourvu(s) d'une portion (62) évasée qui s'étend à partir de la portion annulaire (61).Device according to claim 4 wherein the nut (the nuts) (71) is (are) provided with a portion (62) flared extending from the annular portion (61). Dispositif selon la revendication 5 dans lequel la portion (62) évasée est sensiblement tronconique.Device according to claim 5 wherein the flared portion (62) is substantially frustoconical. Dispositif selon la revendication 4 ou 5 dans lequel la portion (62) évasée est pourvue d'empreintes (63) à sa périphérie.Device according to claim 4 or 5 wherein the flared portion (62) is provided with indentations (63) at its periphery. Ensemble d'armatures pour béton, qui comporte deux barres (25, 26) d'armature en acier dont les extrémités filetées (51, 52) sont vissées dans un manchon (20, 23) en acier selon l'une quelconque des revendications 1 à 3, le manchon comportant des aspérités (27 à 34, 39 à 41) forgées sur sa face externe (60).Concrete reinforcement set comprising two steel reinforcing bars (25, 26) whose threaded ends (51, 52) are screwed into a steel sleeve (20, 23) according to any one of claims 1 to at 3, the sleeve having asperities (27 to 34, 39 to 41) forged on its outer face (60). Ensemble selon la revendication 8 dans lequel l'acier constituant le manchon présente, au moins une caractéristique mécanique distincte de celle de l'acier constituant les barres d'armature.An assembly according to claim 8 wherein the steel constituting the sleeve has at least one mechanical characteristic distinct from that of the steel constituting the reinforcing bars. Ensemble selon la revendication 8 ou 9, qui comporte deux écrous (71) respectivement vissés sur les extrémités filetées des deux barres et en appui sur les deux extrémités longitudinales (75, 76) du manchon.Assembly according to claim 8 or 9, which comprises two nuts (71) respectively screwed onto the threaded ends of the two bars and bearing on the two longitudinal ends (75, 76) of the sleeve.
EP18000683.5A 2009-11-26 2010-11-15 Framework linking device Active EP3495068B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0905677A FR2952840B1 (en) 2009-11-26 2009-11-26 ARMATURE BONDING DEVICE AND METHOD FOR MANUFACTURING THE SAME
EP10790458.3A EP2504117B1 (en) 2009-11-26 2010-11-15 Manufacturing method of a reinforcement-linking device
PCT/FR2010/000759 WO2011064466A1 (en) 2009-11-26 2010-11-15 Reinforcement-linking device and manufacturing method thereof

Related Parent Applications (2)

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EP10790458.3A Division EP2504117B1 (en) 2009-11-26 2010-11-15 Manufacturing method of a reinforcement-linking device
PCT/FR2010/000759 Previously-Filed-Application WO2011064466A1 (en) 2009-11-26 2010-11-15 Reinforcement-linking device and manufacturing method thereof

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EP3495068A1 true EP3495068A1 (en) 2019-06-12
EP3495068B1 EP3495068B1 (en) 2022-07-20

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DK (2) DK3495068T3 (en)
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CN110409715A (en) * 2019-07-12 2019-11-05 周世宇 A kind of half grout sleeve connector of screw-thread steel

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Publication number Priority date Publication date Assignee Title
FR3101661B1 (en) 2019-10-08 2022-11-18 Vinci Construction Grands Projets Reinforced concrete tunnel segment
CN115198971A (en) * 2022-07-07 2022-10-18 上海宇辉住宅工业有限公司 Pre-grouting type full-grouting sleeve structure and construction method

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US5664902A (en) * 1995-01-26 1997-09-09 Barsplice Products, Inc. Tubular coupler for concrete reinforcing bars
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DE10013581A1 (en) * 2000-03-18 2001-09-20 Ischebeck Friedrich Gmbh Structural steel part for reinforcement or anchorage comprises bar with outside thread ribs at specified spacing and pitch and at angle to bar axis using externally threaded coupling nuts to join steel parts.
US20030198513A1 (en) * 2000-11-21 2003-10-23 Barsplice Products, Inc. Method of making steel couplers for joining concrete reinforcing bars
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US5664902A (en) * 1995-01-26 1997-09-09 Barsplice Products, Inc. Tubular coupler for concrete reinforcing bars
EP0728880A1 (en) 1995-02-23 1996-08-28 Etablissements A. Mure Connecting and anchoring device for reinforcing rods with high adherence for reinforced concrete and method of its realization
EP0947642A2 (en) * 1998-03-31 1999-10-06 Gyeng Ok Chung Method of working connection end of deformed bar for reinforcing concrete, deformed bar worked by the method and structure of connecting deformed bar
DE10013581A1 (en) * 2000-03-18 2001-09-20 Ischebeck Friedrich Gmbh Structural steel part for reinforcement or anchorage comprises bar with outside thread ribs at specified spacing and pitch and at angle to bar axis using externally threaded coupling nuts to join steel parts.
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Publication number Priority date Publication date Assignee Title
CN110409715A (en) * 2019-07-12 2019-11-05 周世宇 A kind of half grout sleeve connector of screw-thread steel

Also Published As

Publication number Publication date
WO2011064466A1 (en) 2011-06-03
EP3495068B1 (en) 2022-07-20
EP2504117B1 (en) 2018-08-22
FR2952840B1 (en) 2013-08-02
FR2952840A1 (en) 2011-05-27
EP2504117A1 (en) 2012-10-03
DK2504117T3 (en) 2018-11-12
DK3495068T3 (en) 2022-10-24

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