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EP3004483B1 - Reinforcing rod with high adherence for reinforced concrete - Google Patents

Reinforcing rod with high adherence for reinforced concrete Download PDF

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Publication number
EP3004483B1
EP3004483B1 EP14729702.2A EP14729702A EP3004483B1 EP 3004483 B1 EP3004483 B1 EP 3004483B1 EP 14729702 A EP14729702 A EP 14729702A EP 3004483 B1 EP3004483 B1 EP 3004483B1
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EP
European Patent Office
Prior art keywords
reinforcing bar
end portion
connection sleeve
upset end
extension
Prior art date
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EP14729702.2A
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German (de)
French (fr)
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EP3004483A1 (en
Inventor
Richard BOISSON
Philippe Huet
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Magnetude
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Magnetude
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
    • 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
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • 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
    • B21K1/56—Making machine elements screw-threaded elements
    • 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 high-strength reinforcing bar for reinforced concrete, an assembly comprising such a reinforcing bar, a method of assembling a reinforcement for reinforced concrete and a method of manufacturing a reinforcement for reinforced concrete. .
  • the document CN 1 060 133 discloses a reinforcing bar according to the preamble of claim 1.
  • the embodiment of the thread on a discharged end portion that is to say on a reinforced end portion and having an outside diameter greater than the nominal diameter of the reinforcing bar, makes it possible to limit the risks of rupture of the the reinforcing bar at the thread, and more particularly when the diameter at the bottom of the thread is greater than the diameter rebar, as mentioned in the document FR 2,639,054 .
  • the nominal diameter of a reinforcing bar corresponds to the outside diameter of a theoretical reinforcing bar of constant circular section and having the same linear density as said reinforcing bar.
  • the cold discharge of a large portion of the reinforcing bar causes, on the one hand, a modification of the crystalline structure of said portion, which may cause embrittlement of the reinforcing bar at the level of the portion of the reinforcing bar. end repressed, and therefore a risk of rupture of the rebar at this location, and secondly a remanent deformation of the rebar when it is put in tension.
  • the present invention aims to remedy these disadvantages.
  • the technical problem underlying the invention therefore consists in providing a high-strength reinforcing bar for reinforced concrete which is of simple and economical structure, while ensuring a reliable and easy assembly of a reinforcement for reinforced concrete.
  • Such a configuration of the upset end portion makes it possible to limit the degradations of the crystalline structure of said end portion during the discharge step of the reinforcing bar, and thus to greatly limit the risks of rupture and remanent deformation of the rebar at this location, without requiring an over-size of said rebar.
  • the reinforcing bar according to the invention thus ensures a reliable assembly of a reinforcement for reinforced concrete.
  • the thread extends at least in part over the first and second portions of the end portion.
  • the second part comprises a longitudinal core and attachment asperities formed on the outer surface of said longitudinal core.
  • the longitudinal core of the second portion is of decreasing general section in the direction of the extension portion.
  • the second part extends in the extension of the first part.
  • the second portion extends to the extension portion.
  • the first part extends from the corresponding free end of the reinforcing bar.
  • the second part has a length greater than twice the length of the first part.
  • the second portion of the end-discharge portion has a length greater than or equal to the nominal diameter of the reinforcing bar.
  • the second portion of the end-discharge portion comprises at least a first substantially frustoconical portion having its largest base facing the first portion of the end-end portion, and a second portion substantially frustoconical disposed between the first substantially frustoconical portion and the extension portion, the second substantially frustoconical portion having its largest base facing the first substantially frustoconical portion.
  • the first substantially frustoconical portion has a slope of between 6 and 18%, and preferably between 8 and 16%.
  • the second substantially frustoconical portion has a slope of between 2 and 5%, and preferably between 2.2 and 4.5%.
  • the second substantially frustoconical portion has a length greater than or equal to the length of the first substantially frustoconical portion.
  • the second substantially frustoconical portion extends in the extension of the first substantially frustoconical portion.
  • the second substantially frustoconical portion has a length greater than or equal to the length of the first portion.
  • the longitudinal core of the second portion comprises at least a first substantially frustoconical core portion having its largest base facing the first portion, and a second substantially frustoconical core portion disposed between the first core portion and the extension portion, the second core portion having its largest base facing the first core portion.
  • the second core portion has a length greater than or equal to the length of the first portion.
  • the second core portion has a length greater than or equal to the length of the first core portion.
  • the thread extends at least in part over the first and second core portions.
  • the diameter of the second core portion at its largest base is greater than the nominal diameter of the reinforcing bar.
  • the cross section of the end portion discharged at the thread bottom of the thread is greater than a cross section of the extension portion.
  • the cylinder circumscribing the extension portion and having an axis parallel to the longitudinal axis of the extension portion has a smaller diameter than the bottom thread diameter of the thread.
  • circumscribed cylinder is meant the smaller diameter cylinder including all the points of the extension portion.
  • the projection of the extension portion on a plane orthogonal to the longitudinal axis of the rebar defines a first surface and the projection of the cross section of the end portion discharged at the Thread bottom thread on said plane defines a second surface, the first surface being inscribed in the second surface.
  • the thread extends over a longitudinal length that is less than or equal to the length of the end-pushed portion.
  • the cross section of the end portion discharged at the thread bottom of the thread is greater than each cross section of the extension portion.
  • the threading provided on the upset end portion is cylindrical.
  • the discharged end portion extends in the extension of the extension portion.
  • the discharged end portion has a length of between 0.5 and 1.4 times the nominal diameter of the reinforcing bar.
  • the end portion has a length corresponding to about 0.6 times the nominal diameter of the reinforcing bar (for example when the reinforcing bar is intended for a standard assembly, also called LS bond, that is to say that is, allowing a rotation drive of said reinforcing bar when it is assembled to another connecting bar by means of a connecting sleeve
  • the end-end portion has a length corresponding to about 1.2 times the nominal diameter of the reinforcing bar (for example when said reinforcing bar can not be rotated during its assembly to another connecting bar with the aid of a connecting sleeve, that is to say for example during an LSR link or an LCE link).
  • the attachment asperities comprise at least one longitudinal rib, and preferably two longitudinal ribs substantially diametrically opposed.
  • the attachment asperities comprise a plurality of oblique ribs, also called locks, the oblique ribs having for example a general crescent shape.
  • the extension portion comprises a longitudinal core on the outer surface of which are formed the attachment asperities.
  • the extension portion and the repressed end portion extend substantially coaxially.
  • the present invention further relates to a reinforcement assembly for reinforced concrete, comprising a reinforcing bar according to the invention, and a connecting sleeve comprising a thread arranged to cooperate with the threading provided on the end portion repressed.
  • the discharged end portion has a length greater than or substantially equal to the longitudinal length of the tapping provided on the connecting sleeve.
  • the assembly further comprises a stop nut intended to cooperate with the thread on the one hand provided on the end end portion and on the other hand the connecting sleeve.
  • the stop nut is intended to cooperate with one end of the connecting sleeve.
  • the discharged end portion has a length greater than or substantially equal to the sum of the longitudinal length of the tapping provided on the connecting sleeve and the height of the stop nut.
  • the threading is defined by a diameter / pitch pair that does not comply with the international threading standards, and this in such a way as to define a specific torque as a function of the armature diameters and the diameter. link to achieve.
  • the discharge step is performed cold.
  • the discharge step is carried out at variable speed, for example continuously or in stages.
  • the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range.
  • the delivery speed is degressive during the first delivery mode.
  • the reinforcing bar 2 comprises an extension portion 3 and a raised end portion 4 extending in the extension of the extension portion 3.
  • the extension portion 3 and the end portion 4 s pushed back extend substantially coaxially.
  • the extension portion 3 comprises a substantially cylindrical longitudinal core 5 and attachment asperities provided on the outer surface of the longitudinal core 5.
  • the attachment asperities comprise two diametrically opposite longitudinal ribs 6, and a plurality of oblique ribs 7, also called locks, arranged between the longitudinal ribs 6.
  • the oblique ribs 7 may for example have a general crescent shape.
  • the pushed end portion 4 has a substantially cylindrical first portion 41 extending from the corresponding free end of the reinforcing bar 2, and a second portion 42 extending the first portion 41.
  • the second portion 42 s extends to the extension portion 3 and has a length greater than or equal to the length of the first portion 41.
  • the second part 42 has a length greater than or equal to the nominal diameter Dn of the reinforcing bar 2.
  • the second portion 42 comprises a first substantially frustoconical portion 42a having its largest base facing the first portion 41 of the end-discharge portion 4, and a second substantially frustoconical portion 42b disposed between the first portion 42a and the portion of extension 3, the second portion 42b having its largest base facing the first portion 42a.
  • the first portion 42a extends in the extension of the first portion 41
  • the second portion 42b extends in the extension of the first portion 42a.
  • the second portion 42b has a length greater than or equal to the length of the first portion 42a, and greater than or equal to the length of the first portion 41.
  • the upset end portion 4 is provided with a cylindrical thread 8 intended to cooperate with a tapping formed in a connecting sleeve, and having a diameter at the bottom of thread Df greater than or equal to the nominal diameter Dn of the bar of frame 2.
  • the cylindrical threading 8 extends only over part of the length of the upset end portion 4.
  • the cylindrical threading 8 extends in part over the first and second portions 42a, 42b of the pushed end portion 4.
  • the discharge step is performed cold and at variable speed, for example continuously or in stages.
  • the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range.
  • the discharge step consists in forming the second portion 42 'so that it comprises at least a first substantially frustoconical portion 42a' having its largest base facing the first portion 41 ', and a second portion substantially' frustoconical 42b 'disposed between the first portion 42a' and the extension portion 3 ', the second portion 42b' having its largest base facing the first portion 42a '.
  • first portions 41, 41 'and the first and second portions 42a, 42a', 42b, 42b ' have slightly different lengths, respectively, because the thread 8 has a threaded aperture diameter smaller than the outside diameter. of the first part 41 '.
  • a first method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 3 and 4 .
  • the discharged end portion 4 of the second reinforcing bar 2 ' has a length greater than or substantially equal to the longitudinal length of the tapping 13 provided on the connecting sleeve 12.
  • the end portion of the connecting sleeve 12 intended to be turned towards the first reinforcing bar 2 is flared so as to facilitate the insertion of the first reinforcing bar 2 into the connecting sleeve 12.
  • a second method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 5 and 6 .
  • the discharged end portion 4 of the second reinforcing bar 2 ' has a length greater than or substantially equal to the sum of the longitudinal length of the tapping 13 provided on the connecting sleeve 12 and the height of the thrust nut 16.
  • the figure 8 represents a reinforcing bar according to a second embodiment of the invention which differs from that shown on the Figures 1 to 7 essentially in that the cylinder circumscribing the extension portion 3 and having an axis parallel to the longitudinal axis of the extension portion 3 has a diameter smaller than the diameter at the bottom of the thread Df of the cylindrical thread 8.
  • the projection of the extension portion 3 on a plane orthogonal to the longitudinal axis of the reinforcing bar 2 defines a first surface S1 and the projection of the cross section of the discharged end portion 4 at the thread bottom of the cylindrical thread 8 on said plane defines a second surface S2, the first surface S1 being inscribed in the second surface. S2.
  • the cross section of the end-end portion 4 at the bottom of the thread of the cylindrical thread 8 is greater than each cross-section of the extension portion 3, and more precisely at each section of the extension portion 3 orthogonal to the longitudinal axis of the extension portion 3.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Description

La présente invention concerne une barre d'armature à haute adhérence pour béton armé, un ensemble comprenant une telle barre d'armature, un procédé d'assemblage d'une armature pour béton armé et un procédé de fabrication d'une armature pour béton armé.The present invention relates to a high-strength reinforcing bar for reinforced concrete, an assembly comprising such a reinforcing bar, a method of assembling a reinforcement for reinforced concrete and a method of manufacturing a reinforcement for reinforced concrete. .

Lorsqu'il convient de construire un ouvrage en béton armé, il est connu de disposer bout à bout plusieurs barres d'armature et de relier ces dernières de manière à assurer une transmission des efforts de traction le long des barres d'armature.When it is appropriate to build a reinforced concrete structure, it is known to have several reinforcement bars end to end and to connect the latter so as to ensure a transmission of tensile forces along the reinforcing bars.

Le document CN 1 060 133 divulgue une barre d'armature selon le préambule de la revendication 1.The document CN 1 060 133 discloses a reinforcing bar according to the preamble of claim 1.

Le document FR 2 639 054 divulgue une armature pour béton armé comprenant :

  • une première et une deuxième barres d'armature comportant chacune une portion d'extension pourvue d'aspérités d'accrochage, et une portion d'extrémité refoulée prolongeant la portion d'extension et sur laquelle est ménagé un filetage ou filet hélicoïdal, et
  • un manchon de liaison taraudé agencé pour coopérer avec les filetages ménagés sur les portions d'extrémité refoulée des première et deuxième barres d'armature.
The document FR 2,639,054 discloses a reinforcement for reinforced concrete comprising:
  • a first and a second reinforcing bar each comprising an extension portion provided with attachment asperities, and a discharged end portion extending the extension portion and on which is formed a thread or helical thread, and
  • a threaded connection sleeve arranged to cooperate with the threads formed on the end-end portions of the first and second reinforcing bars.

L'assemblage des première et deuxième barres d'armature peut alors être réalisé aisément en effectuant les étapes suivantes :

  • immobiliser la première barre d'armature dans une tranche de l'ouvrage en béton armé,
  • visser une première portion du manchon de liaison sur la portion d'extrémité refoulée de la première barre d'armature,
  • insérer la portion d'extrémité refoulée de la deuxième barre d'armature dans le manchon de liaison, et
  • entraîner en rotation la deuxième barre d'armature de manière à faire coopérer la portion d'extrémité refoulée de la deuxième barre d'armature avec le taraudage du manchon de liaison.
The assembly of the first and second reinforcing bars can then be easily achieved by performing the following steps:
  • immobilize the first reinforcing bar in a slice of the reinforced concrete structure,
  • screwing a first portion of the connecting sleeve on the pushed end portion of the first reinforcing bar,
  • inserting the pushed end portion of the second reinforcing bar into the connecting sleeve, and
  • rotating the second reinforcing bar in such a way as to make the pushed end portion of the second reinforcing bar cooperate with the tapping of the connecting sleeve.

La réalisation du filetage sur une portion d'extrémité refoulée, c'est-à-dire sur une portion d'extrémité renforcée et présentant un diamètre extérieur supérieur au diamètre nominal de la barre d'armature, permet de limiter les risques de rupture de la barre d'armature au niveau du filetage, et ce plus particulièrement lorsque le diamètre à fond du filet est supérieur au diamètre nominal de la barre d'armature, comme cela est évoqué dans le document FR 2 639 054 .The embodiment of the thread on a discharged end portion, that is to say on a reinforced end portion and having an outside diameter greater than the nominal diameter of the reinforcing bar, makes it possible to limit the risks of rupture of the the reinforcing bar at the thread, and more particularly when the diameter at the bottom of the thread is greater than the diameter rebar, as mentioned in the document FR 2,639,054 .

Il convient de rappeler que le diamètre nominal d'une barre d'armature correspond au diamètre extérieur d'une barre d'armature théorique de section circulaire constante et présentant la même masse linéique que ladite barre d'armature.It should be remembered that the nominal diameter of a reinforcing bar corresponds to the outside diameter of a theoretical reinforcing bar of constant circular section and having the same linear density as said reinforcing bar.

Lorsqu'il n'est pas possible d'entraîner en rotation la deuxième barre d'armature pour réaliser l'assemblage de celle-ci sur la première barre d'armature (par exemple lorsque la deuxième barre d'armature présente un poids important ou est coudée, ou encore lorsque l'accès à cette dernière est malaisé), il est alors connu d'augmenter la longueur de la portion d'extrémité refoulée et du filetage ménagé sur cette dernière.When it is not possible to rotate the second reinforcing bar in order to assemble it on the first reinforcing bar (for example when the second reinforcing bar has a large weight or is bent, or when access to the latter is difficult), it is then known to increase the length of the end portion discharged and the thread formed thereon.

Ces dispositions permettent d'assurer un assemblage aisé d'une première et d'une deuxième barres d'armature tout simplement en vissant le manchon de liaison intégralement sur la deuxième barre d'armature, en aboutant la portion d'extrémité refoulée de la deuxième barre d'armature contre la portion d'extrémité refoulée de la première barre d'armature préalablement immobilisée dans l'ouvrage en béton, et en entraînant en rotation le manchon de liaison par rapport à la deuxième barre d'armature de manière à faire coopérer le taraudage du manchon de liaison avec le filetage de la première barre d'armature.These arrangements make it possible to ensure easy assembly of a first and a second reinforcing bar simply by screwing the connecting sleeve integrally on the second reinforcing bar, by abutting the end-pushed portion of the second reinforcing bar against the pushed end portion of the first reinforcing bar immobilized in the concrete structure, and rotating the connecting sleeve relative to the second reinforcing bar so as to cooperate tapping the connecting sleeve with the thread of the first reinforcing bar.

Cependant, le refoulement à froid d'une portion importante de la barre d'armature entraîne d'une part une modification de la structure cristalline de ladite portion, susceptible de provoquer une fragilisation de la barre d'armature au niveau de la portion d'extrémité refoulée, et donc un risque de rupture de la barre d'armature à cet endroit, et d'autre part une déformation rémanente de la barre d'armature lors de sa mise en tension.However, the cold discharge of a large portion of the reinforcing bar causes, on the one hand, a modification of the crystalline structure of said portion, which may cause embrittlement of the reinforcing bar at the level of the portion of the reinforcing bar. end repressed, and therefore a risk of rupture of the rebar at this location, and secondly a remanent deformation of the rebar when it is put in tension.

Afin d'éviter tout risque de rupture et/ou de déformation rémanente de la barre d'armature au niveau de la portion d'extrémité refoulée, il est alors nécessaire de surdimensionner la barre d'armature, ce qui implique notamment une augmentation des coûts de fabrication de la barre d'armature.In order to avoid any risk of breakage and / or permanent deformation of the reinforcing bar at the end-end portion, it is then necessary to oversize the reinforcing bar, which implies, in particular, increased costs. of making the rebar.

La présente invention vise à remédier à ces inconvénients.The present invention aims to remedy these disadvantages.

Le problème technique à la base de l'invention consiste donc à fournir une barre d'armature à haute adhérence pour béton armé qui soit de structure simple et économique, tout en assurant un assemblage fiable et aisé d'une armature pour béton armé.The technical problem underlying the invention therefore consists in providing a high-strength reinforcing bar for reinforced concrete which is of simple and economical structure, while ensuring a reliable and easy assembly of a reinforcement for reinforced concrete.

A cet effet, la présente invention concerne une barre d'armature à haute adhérence pour béton armé, comprenant :

  • une portion d'extension comportant, sur sa surface extérieure, des aspérités d'accrochage destinées à favoriser l'adhérence entre la barre d'armature et le béton, et
  • une portion d'extrémité refoulée pourvue d'un filetage destiné à coopérer avec un taraudage ménagé dans un manchon de liaison, le diamètre à fond de filet du filetage étant supérieur ou égal au diamètre nominal de la barre d'armature,
la portion d'extrémité refoulée comporte une première partie sensiblement cylindrique, et au moins une deuxième partie disposée entre la première partie et la portion d'extension, la deuxième partie étant de section générale décroissante en direction de la portion d'extension, caractérisé en ce que la deuxième partie présente une longueur supérieure ou égale à la longueur de la première partie.To this end, the present invention relates to a high-strength reinforcement bar for reinforced concrete, comprising:
  • an extension portion having, on its outer surface, attachment asperities designed to promote adhesion between the reinforcing bar and the concrete, and
  • a discharged end portion provided with a thread intended to cooperate with a tapping formed in a connecting sleeve, the threaded diameter of the thread being greater than or equal to the nominal diameter of the reinforcing bar,
the discharged end portion has a first substantially cylindrical portion, and at least a second portion disposed between the first portion and the extension portion, the second portion being of decreasing general section towards the extension portion, characterized in that that the second part has a length greater than or equal to the length of the first part.

Une telle configuration de la portion d'extrémité refoulée permet de limiter les dégradations de la structure cristalline de ladite portion d'extrémité lors de l'étape de refoulement de la barre d'armature, et donc de limiter fortement les risques de rupture et de déformation rémanente de la barre d'armature à cet endroit, et ce sans nécessiter un surdimensionnement de ladite barre d'armature. La barre d'armature selon l'invention assure ainsi un assemblage fiable d'une armature pour béton armé.Such a configuration of the upset end portion makes it possible to limit the degradations of the crystalline structure of said end portion during the discharge step of the reinforcing bar, and thus to greatly limit the risks of rupture and remanent deformation of the rebar at this location, without requiring an over-size of said rebar. The reinforcing bar according to the invention thus ensures a reliable assembly of a reinforcement for reinforced concrete.

Selon un mode de réalisation de l'invention, le filetage s'étend au moins en partie sur les première et deuxième parties de la portion d'extrémité.According to one embodiment of the invention, the thread extends at least in part over the first and second portions of the end portion.

Selon un mode de réalisation de l'invention, la deuxième partie comprend une âme longitudinale et des aspérités d'accrochage ménagées sur la surface extérieure de ladite âme longitudinale. Avantageusement, l'âme longitudinale de la deuxième partie est de section générale décroissante en direction de la portion d'extension.According to one embodiment of the invention, the second part comprises a longitudinal core and attachment asperities formed on the outer surface of said longitudinal core. Advantageously, the longitudinal core of the second portion is of decreasing general section in the direction of the extension portion.

Selon un mode de réalisation de l'invention, la deuxième partie s'étend dans le prolongement de la première partie. De préférence, la deuxième partie s'étend jusqu'à la portion d'extension.According to one embodiment of the invention, the second part extends in the extension of the first part. Preferably, the second portion extends to the extension portion.

Selon un aspect de l'invention, la première partie s'étend à partir de l'extrémité libre correspondante de la barre d'armature.According to one aspect of the invention, the first part extends from the corresponding free end of the reinforcing bar.

Selon un mode de réalisation de l'invention, la deuxième partie présente une longueur supérieure au double de la longueur de la première partie.According to one embodiment of the invention, the second part has a length greater than twice the length of the first part.

Selon un mode de réalisation de l'invention, la deuxième partie de la portion d'extrémité refoulée présente une longueur supérieure ou égale au diamètre nominal de la barre d'armature.According to one embodiment of the invention, the second portion of the end-discharge portion has a length greater than or equal to the nominal diameter of the reinforcing bar.

Selon un mode de réalisation de l'invention, la deuxième partie de la portion d'extrémité refoulée comporte au moins une première portion sensiblement tronconique ayant sa plus grande base tournée vers la première partie de la portion d'extrémité refoulée, et une deuxième portion sensiblement tronconique disposée entre la première portion sensiblement tronconique et la portion d'extension, la deuxième portion sensiblement tronconique ayant sa plus grande base tournée vers la première portion sensiblement tronconique.According to one embodiment of the invention, the second portion of the end-discharge portion comprises at least a first substantially frustoconical portion having its largest base facing the first portion of the end-end portion, and a second portion substantially frustoconical disposed between the first substantially frustoconical portion and the extension portion, the second substantially frustoconical portion having its largest base facing the first substantially frustoconical portion.

Selon un mode de réalisation de l'invention, la première portion sensiblement tronconique présente une pente comprise entre 6 et 18%, et de préférence entre 8 et 16%.According to one embodiment of the invention, the first substantially frustoconical portion has a slope of between 6 and 18%, and preferably between 8 and 16%.

Selon un mode de réalisation de l'invention, la deuxième portion sensiblement tronconique présente une pente comprise entre 2 et 5%, et de préférence entre 2.2 et 4,5%.According to one embodiment of the invention, the second substantially frustoconical portion has a slope of between 2 and 5%, and preferably between 2.2 and 4.5%.

Selon un mode de réalisation de l'invention, la deuxième portion sensiblement tronconique présente une longueur supérieure ou égale à la longueur de la première portion sensiblement tronconique.According to one embodiment of the invention, the second substantially frustoconical portion has a length greater than or equal to the length of the first substantially frustoconical portion.

Selon un mode de réalisation de l'invention, la deuxième portion sensiblement tronconique s'étend dans le prolongement de la première portion sensiblement tronconique.According to one embodiment of the invention, the second substantially frustoconical portion extends in the extension of the first substantially frustoconical portion.

Selon un mode de réalisation de l'invention, la deuxième portion sensiblement tronconique présente une longueur supérieure ou égale à la longueur de la première partie.According to one embodiment of the invention, the second substantially frustoconical portion has a length greater than or equal to the length of the first portion.

Selon un mode de réalisation de l'invention, l'âme longitudinale de la deuxième partie comporte au moins une première portion d'âme sensiblement tronconique ayant sa plus grande base tournée vers la première partie, et une deuxième portion d'âme sensiblement tronconique disposée entre la première portion d'âme et la portion d'extension, la deuxième portion d'âme ayant sa plus grande base tournée vers la première portion d'âme. Selon un mode de réalisation de l'invention, la deuxième portion d'âme présente une longueur supérieure ou égale à la longueur de la première partie. Par exemple, la deuxième portion d'âme présente une longueur supérieure ou égale à la longueur de la première portion d'âme.According to one embodiment of the invention, the longitudinal core of the second portion comprises at least a first substantially frustoconical core portion having its largest base facing the first portion, and a second substantially frustoconical core portion disposed between the first core portion and the extension portion, the second core portion having its largest base facing the first core portion. According to one embodiment of the invention, the second core portion has a length greater than or equal to the length of the first portion. For example, the second core portion has a length greater than or equal to the length of the first core portion.

Selon un mode de réalisation de l'invention, le filetage s'étend au moins en partie sur les première et deuxième portions d'âme.According to one embodiment of the invention, the thread extends at least in part over the first and second core portions.

Selon un mode de réalisation de l'invention, le diamètre de la deuxième portion d'âme au niveau de sa plus grande base est supérieur au diamètre nominal de la barre d'armature.According to one embodiment of the invention, the diameter of the second core portion at its largest base is greater than the nominal diameter of the reinforcing bar.

Selon un mode de réalisation de l'invention, la section transversale de la portion d'extrémité refoulée au niveau du fond de filet du filetage est supérieure à une section transversale de la portion d'extension. Ces dispositions évitent d'entailler la partie d'extension quelles que soit les tolérances sur le filetage et sur la masse linéique de la portion d'extrémité refoulée.According to one embodiment of the invention, the cross section of the end portion discharged at the thread bottom of the thread is greater than a cross section of the extension portion. These provisions avoid notching the extension part regardless of the tolerances on the thread and the linear density of the end portion discharged.

Selon un mode de réalisation de l'invention, le cylindre circonscrit à la portion d'extension et d'axe parallèle à l'axe longitudinal de la portion d'extension présente un diamètre inférieur au diamètre à fond de filet du filetage. On entend par cylindre circonscrit, le cylindre de plus petit diamètre incluant l'ensemble des points de la portion d'extension.According to one embodiment of the invention, the cylinder circumscribing the extension portion and having an axis parallel to the longitudinal axis of the extension portion has a smaller diameter than the bottom thread diameter of the thread. By circumscribed cylinder is meant the smaller diameter cylinder including all the points of the extension portion.

En d'autres termes, la projection de la portion d'extension sur un plan orthogonal à l'axe longitudinal de la barre d'armature définit une première surface et la projection de la section transversale de la portion d'extrémité refoulée au niveau du fond de filet du filetage sur ledit plan définit une deuxième surface, la première surface étant inscrite dans la deuxième surface.In other words, the projection of the extension portion on a plane orthogonal to the longitudinal axis of the rebar defines a first surface and the projection of the cross section of the end portion discharged at the Thread bottom thread on said plane defines a second surface, the first surface being inscribed in the second surface.

Selon un mode de réalisation de l'invention, le filetage s'étend sur une longueur longitudinale inférieure ou égale à la longueur de la portion d'extrémité refoulée.According to one embodiment of the invention, the thread extends over a longitudinal length that is less than or equal to the length of the end-pushed portion.

Selon un aspect de l'invention, la section transversale de la portion d'extrémité refoulée au niveau du fond de filet du filetage est supérieure à chaque section transversale de la portion d'extension.According to one aspect of the invention, the cross section of the end portion discharged at the thread bottom of the thread is greater than each cross section of the extension portion.

Selon un mode de réalisation de l'invention, le filetage prévu sur la portion d'extrémité refoulée est cylindrique.According to one embodiment of the invention, the threading provided on the upset end portion is cylindrical.

Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée s'étend dans le prolongement de la portion d'extension.According to one embodiment of the invention, the discharged end portion extends in the extension of the extension portion.

Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée présente une longueur comprise entre 0,5 et 1,4 fois le diamètre nominal de la barre d'armature. Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée présente une longueur correspondant à environ 0,6 fois le diamètre nominal de la barre d'armature (par exemple lorsque la barre d'armature est destinée à un assemblage standard, également appelé liaison LS, c'est-à-dire autorisant un entraînement en rotation de ladite barre d'armature lors de son assemblage à une autre barre de liaison à l'aide d'un manchon de liaison. Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée présente une longueur correspondant à environ 1,2 fois le diamètre nominal de la barre d'armature (par exemple lorsque ladite barre d'armature ne peut être entraînée en rotation lors de son assemblage à une autre barre de liaison à l'aide d'un manchon de liaison, c'est-à-dire par exemple lors d'une liaison LSR ou d'une liaison LCE).According to one embodiment of the invention, the discharged end portion has a length of between 0.5 and 1.4 times the nominal diameter of the reinforcing bar. According to one embodiment of the invention, the end portion has a length corresponding to about 0.6 times the nominal diameter of the reinforcing bar (for example when the reinforcing bar is intended for a standard assembly, also called LS bond, that is to say that is, allowing a rotation drive of said reinforcing bar when it is assembled to another connecting bar by means of a connecting sleeve, According to an embodiment of the invention, the end-end portion has a length corresponding to about 1.2 times the nominal diameter of the reinforcing bar (for example when said reinforcing bar can not be rotated during its assembly to another connecting bar with the aid of a connecting sleeve, that is to say for example during an LSR link or an LCE link).

Selon un mode de réalisation de l'invention, les aspérités d'accrochage comportent au moins une nervure longitudinale, et de préférences deux nervures longitudinales sensiblement diamétralement opposées.According to one embodiment of the invention, the attachment asperities comprise at least one longitudinal rib, and preferably two longitudinal ribs substantially diametrically opposed.

Selon un mode de réalisation de l'invention, les aspérités d'accrochage comportent une pluralité de nervures obliques, encore appelées verrous, les nervures obliques présentant par exemple une forme générale de croissant.According to one embodiment of the invention, the attachment asperities comprise a plurality of oblique ribs, also called locks, the oblique ribs having for example a general crescent shape.

Selon un mode de réalisation de l'invention, la portion d'extension comprend une âme longitudinale sur la surface extérieure de laquelle sont ménagées les aspérités d'accrochage.According to one embodiment of the invention, the extension portion comprises a longitudinal core on the outer surface of which are formed the attachment asperities.

Selon un mode de réalisation de l'invention, la portion d'extension et la portion d'extrémité refoulée s'étendent sensiblement coaxialementAccording to one embodiment of the invention, the extension portion and the repressed end portion extend substantially coaxially.

La présente invention concerne en outre un ensemble pour armature pour béton armé, comprenant une barre d'armature selon l'invention, et un manchon de liaison comportant un taraudage agencé pour coopérer avec le filetage prévu sur la portion d'extrémité refoulée.The present invention further relates to a reinforcement assembly for reinforced concrete, comprising a reinforcing bar according to the invention, and a connecting sleeve comprising a thread arranged to cooperate with the threading provided on the end portion repressed.

Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée présente une longueur supérieure ou sensiblement égale à la longueur longitudinale du taraudage prévu sur le manchon de liaison.According to one embodiment of the invention, the discharged end portion has a length greater than or substantially equal to the longitudinal length of the tapping provided on the connecting sleeve.

Selon un mode de réalisation de l'invention, l'ensemble comprend en outre un écrou de butée destiné à coopérer avec d'une part le filetage prévu sur la portion d'extrémité refoulée et d'autre part le manchon de liaison. De préférence, l'écrou de butée est destiné à coopérer avec une extrémité du manchon de liaison.According to one embodiment of the invention, the assembly further comprises a stop nut intended to cooperate with the thread on the one hand provided on the end end portion and on the other hand the connecting sleeve. Preferably, the stop nut is intended to cooperate with one end of the connecting sleeve.

Selon un mode de réalisation de l'invention, la portion d'extrémité refoulée présente une longueur supérieure ou sensiblement égale à la somme de la longueur longitudinale du taraudage prévu sur le manchon de liaison et de la hauteur de l'écrou de butée.According to one embodiment of the invention, the discharged end portion has a length greater than or substantially equal to the sum of the longitudinal length of the tapping provided on the connecting sleeve and the height of the stop nut.

La présente invention concerne également un procédé d'assemblage d'une armature pour béton armé, comprenant les étapes suivantes :

  • prévoir une première et une deuxième barres d'armature selon l'invention, les première et deuxième barres d'armature comprenant chacune une portion d'extrémité refoulée et une portion d'extrémité opposée située à l'opposé de la portion d'extrémité refoulée et pourvue d'un filetage,
  • prévoir un manchon de liaison comportant un taraudage agencé pour coopérer avec les filetages prévus sur les portions d'extrémité des première et deuxième barres d'armature,
  • visser le manchon de liaison sur la portion d'extrémité refoulée de la deuxième barre d'armature,
  • abouter la portion d'extrémité refoulée de la deuxième barre d'armature contre la portion d'extrémité opposée de la première barre d'armature,
  • entraîner en rotation le manchon de liaison par rapport à la deuxième barre d'armature de telle sorte que le taraudage du manchon de liaison coopère avec la portion d'extrémité opposée de la première barre d'armature.
The present invention also relates to a method of assembling a reinforcement for reinforced concrete, comprising the following steps:
  • providing a first and a second reinforcing bar according to the invention, the first and second reinforcing bars each comprising a pushed end portion and an opposite end portion located opposite the end-end portion. and provided with a thread,
  • providing a connecting sleeve comprising a tapping arranged to cooperate with the threads provided on the end portions of the first and second reinforcing bars,
  • screw the connecting sleeve onto the pushed end portion of the second reinforcing bar,
  • abut the pushed end portion of the second reinforcing bar against the opposite end portion of the first reinforcing bar,
  • rotating the connecting sleeve in relation to the second reinforcing bar so that the tapping of the connecting sleeve cooperates with the opposite end portion of the first reinforcing bar.

Selon un mode de mise en oeuvre, le procédé comprend en outre :

  • une étape réalisée préalablement au vissage du manchon de liaison sur la portion d'extrémité refoulée de la deuxième barre d'armature et consistant à visser un écrou de butée sur la portion d'extrémité refoulée de la deuxième barre d'armature, et
  • une étape réalisée postérieurement à l'étape d'entraînement en rotation du manchon de liaison et consistant à entraîner en rotation l'écrou de butée par rapport à la deuxième barre d'armature jusqu'à ce qu'il vienne en butée contre le manchon de liaison.
According to one embodiment, the method furthermore comprises:
  • a step performed prior to the screwing of the connecting sleeve on the pushed end portion of the second reinforcing bar and of screwing a stop nut on the pushed end portion of the second reinforcing bar, and
  • a step performed after the step of rotating the connecting sleeve and consisting in rotating the abutment nut relative to the second reinforcing bar until it abuts against the sleeve link.

La présente invention concerne en outre un procédé de fabrication d'une barre d'armature à haute adhérence pour béton armé selon l'invention, comprenant les étapes suivantes :

  • prévoir un élément d'armature comprenant une portion d'extension pourvue, sur sa surface extérieure, d'aspérités d'accrochage, et une portion d'extrémité,
  • refouler à froid la portion d'extrémité de manière à former une première partie sensiblement cylindrique, et au moins une deuxième partie disposée entre la première partie et la portion d'extension, la deuxième partie étant de section générale décroissante en direction de la portion d'extension, la deuxième partie présentant une longueur supérieure ou égale à la longueur de la première partie,
  • ménager sur la portion d'extrémité un filetage présentant un diamètre à fond de filet supérieur ou égal au diamètre nominal de l'élément d'armature.
The present invention furthermore relates to a method of manufacturing a high-strength reinforcement bar for reinforced concrete according to the invention, comprising the following steps:
  • providing a reinforcement element comprising an extension portion provided on its outer surface with attachment asperities, and an end portion,
  • cold-pressing the end portion to form a first substantially cylindrical portion, and at least a second portion disposed between the first portion and the extension portion, the second portion being of decreasing general section towards the portion of extension, the second part having a length greater than or equal to the length of the first part,
  • providing on the end portion a thread having a bottom thread diameter greater than or equal to the nominal diameter of the reinforcing member.

Selon un mode de réalisation de l'invention, le filetage est défini par un couple diamètre / pas ne respectant pas les normes internationales de réalisation de filetage, et ce de manière à définir un couple spécifique en fonction des diamètres d'armature et de la liaison à réaliser.According to one embodiment of the invention, the threading is defined by a diameter / pitch pair that does not comply with the international threading standards, and this in such a way as to define a specific torque as a function of the armature diameters and the diameter. link to achieve.

Selon un mode de mise en oeuvre du procédé de fabrication, l'étape de refoulement est réalisée à froid.According to one embodiment of the manufacturing method, the discharge step is performed cold.

Selon un mode de mise en oeuvre du procédé de fabrication, l'étape de refoulement est réalisée à vitesse variable, par exemple en continue ou par paliers.According to an embodiment of the manufacturing method, the discharge step is carried out at variable speed, for example continuously or in stages.

Par exemple, l'étape de refoulement est réalisée successivement selon un premier mode de refoulement définissant une première plage de vitesses et selon un deuxième mode de refoulement définissant une deuxième plage de vitesses, les vitesses appartenant à la deuxième plage de vitesses étant inférieures à la plus petite des vitesses appartenant à la première plage de vitesses. Selon un mode de mise en oeuvre du procédé de fabrication, la vitesse de refoulement est dégressive durant le premier mode de refoulement.For example, the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range. According to an embodiment of the manufacturing method, the delivery speed is degressive during the first delivery mode.

De toute façon l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de cette barre d'armature.

  • Figure 1 est une vue partielle de côté d'une barre d'armature selon un premier mode de réalisation de l'invention.
  • Figure 2 est une vue partielle schématique de la barre d'armature de la figure 1.
  • Figures 3 et 4 sont des vues de côté de deux barres d'armature selon l'invention en cours d'assemblage selon un premier procédé d'assemblage.
  • Figures 5 et 6 sont des vues de côté de deux barres d'armature selon l'invention en cours d'assemblage selon un deuxième procédé d'assemblage.
  • Figure 7 est une vue partielle schématique de la barre d'armature de la figure 1 en cours de fabrication.
  • Figure 8 est une vue d'une portion d'extension et d'une portion d'extrémité refoulée appartenant à une barre d'armature selon un deuxième mode de réalisation de l'invention, projetées sur un plan orthogonal à l'axe longitudinal de la barre d'armature.
  • La figure 1 représente une barre d'armature 2 à haute adhérence pour béton armé. La barre d'armature 2 est de préférence réalisée en acier.
In any case the invention will be better understood with the aid of the description which follows with reference to the appended schematic drawing showing, by way of non-limiting example, an embodiment of this reinforcing bar.
  • Figure 1 is a partial side view of a reinforcing bar according to a first embodiment of the invention.
  • Figure 2 is a schematic partial view of the rebar of the figure 1 .
  • Figures 3 and 4 are side views of two reinforcing bars according to the invention being assembled according to a first assembly method.
  • Figures 5 and 6 are side views of two reinforcing bars according to the invention being assembled according to a second assembly method.
  • Figure 7 is a schematic partial view of the rebar of the figure 1 during manufacture.
  • Figure 8 is a view of an extension portion and a pushed end portion belonging to a reinforcing bar according to a second embodiment of the invention, projected on a plane orthogonal to the longitudinal axis of the bar frame.
  • The figure 1 represents a high adhesion rebar 2 for reinforced concrete. The reinforcing bar 2 is preferably made of steel.

La barre d'armature 2 comprend une portion d'extension 3 et une portion d'extrémité refoulée 4 s'étendant dans le prolongement de la portion d'extension 3. La portion d'extension 3 et la portion d'extrémité refoulée 4 s'étendent sensiblement coaxialement.The reinforcing bar 2 comprises an extension portion 3 and a raised end portion 4 extending in the extension of the extension portion 3. The extension portion 3 and the end portion 4 s pushed back extend substantially coaxially.

La portion d'extension 3 comprend une âme longitudinale 5 sensiblement cylindrique, et des aspérités d'accrochage prévues sur la surface extérieure de l'âme longitudinale 5. Selon le mode de réalisation représenté sur les figures 1 à 7, les aspérités d'accrochage comportent deux nervures longitudinales 6 diamétralement opposées, et une pluralité de nervures obliques 7, encore appelées verrous, disposées entre les nervures longitudinales 6. Les nervures obliques 7 peuvent par exemple présenter une forme générale de croissant.The extension portion 3 comprises a substantially cylindrical longitudinal core 5 and attachment asperities provided on the outer surface of the longitudinal core 5. According to the embodiment shown in FIGS. Figures 1 to 7 , the attachment asperities comprise two diametrically opposite longitudinal ribs 6, and a plurality of oblique ribs 7, also called locks, arranged between the longitudinal ribs 6. The oblique ribs 7 may for example have a general crescent shape.

Comme montré plus particulièrement sur la figure 2, la portion d'extrémité refoulée 4 comporte une première partie 41 sensiblement cylindrique s'étendant à partir de l'extrémité libre correspondante de la barre d'armature 2, et une deuxième partie 42 prolongeant la première partie 41. La deuxième partie 42 s'étend jusqu'à la portion d'extension 3 et présente une longueur supérieure ou égale à la longueur de la première partie 41. Selon le mode de réalisation représenté sur les figures 1 à 7, la deuxième partie 42 présente une longueur supérieure ou égale au diamètre nominal Dn de la barre d'armature 2.As shown more particularly on the figure 2 the pushed end portion 4 has a substantially cylindrical first portion 41 extending from the corresponding free end of the reinforcing bar 2, and a second portion 42 extending the first portion 41. The second portion 42 s extends to the extension portion 3 and has a length greater than or equal to the length of the first portion 41. According to the embodiment shown in FIGS. Figures 1 to 7 , the second part 42 has a length greater than or equal to the nominal diameter Dn of the reinforcing bar 2.

Selon le mode de réalisation représenté sur les figures 1 à 7, la deuxième partie 42 comporte une première portion 42a sensiblement tronconique ayant sa plus grande base tournée vers la première partie 41 de la portion d'extrémité refoulée 4, et une deuxième portion 42b sensiblement tronconique disposée entre la première portion 42a et la portion d'extension 3, la deuxième portion 42b ayant sa plus grande base tournée vers la première portion 42a. De préférence, la première portion 42a s'étend dans le prolongement de la première partie 41, et la deuxième portion 42b s'étend dans le prolongement de la première portion 42a.According to the embodiment shown on the Figures 1 to 7 , the second portion 42 comprises a first substantially frustoconical portion 42a having its largest base facing the first portion 41 of the end-discharge portion 4, and a second substantially frustoconical portion 42b disposed between the first portion 42a and the portion of extension 3, the second portion 42b having its largest base facing the first portion 42a. Preferably, the first portion 42a extends in the extension of the first portion 41, and the second portion 42b extends in the extension of the first portion 42a.

Selon le mode de réalisation représenté sur les figures 1 à 7, la deuxième portion 42b présente une longueur supérieure ou égale à la longueur de la première portion 42a, et supérieure ou égale à la longueur de la première partie 41.According to the embodiment shown on the Figures 1 to 7 the second portion 42b has a length greater than or equal to the length of the first portion 42a, and greater than or equal to the length of the first portion 41.

Comme montré sur les figures 1 et 2, la portion d'extrémité refoulée 4 est pourvue d'un filetage cylindrique 8 destiné à coopérer avec un taraudage ménagé dans un manchon de liaison, et présentant un diamètre à fond de filet Df supérieur ou égal au diamètre nominal Dn de la barre d'armature 2.As shown on Figures 1 and 2 , the upset end portion 4 is provided with a cylindrical thread 8 intended to cooperate with a tapping formed in a connecting sleeve, and having a diameter at the bottom of thread Df greater than or equal to the nominal diameter Dn of the bar of frame 2.

Selon la présente invention, le filetage cylindrique 8 s'étend uniquement sur une partie de la longueur de la portion d'extrémité refoulée 4. De préférence, le filetage cylindrique 8 s'étend en partie sur les première et deuxième portions 42a, 42b de la portion d'extrémité refoulée 4.According to the present invention, the cylindrical threading 8 extends only over part of the length of the upset end portion 4. Preferably, the cylindrical threading 8 extends in part over the first and second portions 42a, 42b of the pushed end portion 4.

Un procédé de fabrication d'une barre d'armature 2 selon l'invention va maintenant être décrit en se référant plus particulièrement à la figure 7.A method of manufacturing a reinforcing bar 2 according to the invention will now be described with particular reference to the figure 7 .

Un tel procédé de fabrication comprend notamment les étapes suivantes :

  • prévoir un élément d'armature 1 comprenant une portion d'extension 3' pourvue, sur sa surface extérieure, d'aspérités d'accrochage (non représentés sur la figure 7), et une portion d'extrémité 4',
  • refouler à froid la portion d'extrémité 4' de manière à former une première partie 41' sensiblement cylindrique, et au moins une deuxième partie 42' disposée entre la première partie 41' et la portion d'extension 3', la deuxième partie 42' étant de section générale décroissante en direction de la portion d'extension 3', et présentant une longueur supérieure ou égale à la longueur de la première partie 41',
  • ménager sur la portion d'extrémité 4' un filetage 8 présentant un diamètre à fond de filet supérieur ou égal au diamètre nominal de l'élément d'armature 1.
Such a manufacturing method notably comprises the following steps:
  • provide a reinforcement element 1 comprising an extension portion 3 'provided, on its outer surface, with attachment asperities (not shown in FIG. figure 7 ), and an end portion 4 ',
  • cold discharge the end portion 4 'so as to form a first substantially cylindrical portion 41', and at least a second portion 42 'disposed between the first portion 41' and the extension portion 3 ', the second portion 42 'being of decreasing general section towards the extension portion 3 ', and having a length greater than or equal to the length of the first portion 41',
  • providing on the end portion 4 'a thread 8 having a thread-end diameter greater than or equal to the nominal diameter of the reinforcing element 1.

Selon un mode de mise en oeuvre du procédé de fabrication, l'étape de refoulement est réalisée à froid et à vitesse variable, par exemple en continue ou par paliers.According to one embodiment of the manufacturing method, the discharge step is performed cold and at variable speed, for example continuously or in stages.

Par exemple, l'étape de refoulement est réalisée successivement selon un premier mode de refoulement définissant une première plage de vitesses et selon un deuxième mode de refoulement définissant une deuxième plage de vitesses, les vitesses appartenant à la deuxième plage de vitesses étant inférieures à la plus petite des vitesses appartenant à la première plage de vitesses.For example, the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range.

Selon un mode de mise en oeuvre du procédé de fabrication, l'étape de refoulement consiste à former la deuxième partie 42' de manière à ce qu'elle comporte au moins une première portion 42a' sensiblement tronconique ayant sa plus grande base tournée vers la première partie 41', et une deuxième portion 42b' sensiblement tronconique disposée entre la première portion 42a' et la portion d'extension 3', la deuxième portion 42b' ayant sa plus grande base tournée vers la première portion 42a'.According to one embodiment of the manufacturing method, the discharge step consists in forming the second portion 42 'so that it comprises at least a first substantially frustoconical portion 42a' having its largest base facing the first portion 41 ', and a second portion substantially' frustoconical 42b 'disposed between the first portion 42a' and the extension portion 3 ', the second portion 42b' having its largest base facing the first portion 42a '.

Il doit être noté que les première parties 41, 41' et les premières et deuxièmes portions 42a, 42a', 42b, 42b' présentent des longueurs respectivement légèrement différentes du fait que le filetage 8 présente un diamètre à sommet de filet inférieure au diamètre extérieur de la première partie 41'.It should be noted that the first portions 41, 41 'and the first and second portions 42a, 42a', 42b, 42b 'have slightly different lengths, respectively, because the thread 8 has a threaded aperture diameter smaller than the outside diameter. of the first part 41 '.

Un premier procédé d'assemblage d'une armature pour béton armé est décrit ci-après en se référant principalement aux figures 3 et 4.A first method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 3 and 4 .

Ce premier procédé d'assemblage, également appelé liaison LSR, comprend les étapes suivantes consistant à :

  • prévoir une première et une deuxième barres d'armature 2, 2' selon l'invention, les première et deuxième barres d'armature 2, 2' comprenant chacune une portion d'extrémité opposée 10 située à l'opposé de la portion d'extrémité refoulée 4 correspondante et pourvue d'un filetage cylindrique 11,
  • prévoir un manchon de liaison 12 comportant un taraudage 13 agencé pour coopérer avec les filetages cylindriques 8, 11 prévus sur les portions d'extrémité 4, 10 des première et deuxième barres d'armature 2, 2',
  • immobiliser la première barre d'armature 2 dans une tranche d'un ouvrage en béton armé 14,
  • visser le manchon de liaison 12 sur la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' (voir la figure 3),
  • abouter la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' contre la portion d'extrémité opposée 10 de la première barre d'armature 2, et
  • entraîner en rotation le manchon de liaison 12 par rapport à la deuxième barre d'armature 2' de telle sorte que le taraudage 13 du manchon de liaison 12 coopère avec le filetage 11 de la portion d'extrémité opposée 10 de la première barre d'armature 2, et ce jusqu'à ce que le manchon de liaison 12 vienne en butée contre la tranche de l'ouvrage en béton armé 14 (voir la figure 4).
This first assembly method, also called LSR bond, comprises the following steps:
  • providing a first and a second reinforcing bar 2, 2 'according to the invention, the first and second reinforcing bars 2, 2' each comprising an opposite end portion 10 situated opposite the portion of corresponding discharge end 4 and provided with a cylindrical thread 11,
  • provide a connecting sleeve 12 having a tapping 13 arranged to cooperate with the cylindrical threads 8, 11 provided on the end portions 4, 10 of the first and second reinforcing bars 2, 2 ',
  • immobilizing the first reinforcing bar 2 in a slice of a reinforced concrete structure 14,
  • screw the connecting sleeve 12 onto the pushed end portion 4 of the second reinforcing bar 2 '(see figure 3 )
  • abut the pushed end portion 4 of the second reinforcing bar 2 'against the opposite end portion 10 of the first reinforcing bar 2, and
  • rotating the connecting sleeve 12 relative to the second reinforcing bar 2 'so that the tapping 13 of the connecting sleeve 12 cooperates with the thread 11 of the opposite end portion 10 of the first bar reinforcement 2, and this until the connecting sleeve 12 abuts against the edge of the reinforced concrete structure 14 (see FIG. figure 4 ).

De préférence, la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' présente une longueur supérieure ou sensiblement égale à la longueur longitudinale du taraudage 13 prévu sur le manchon de liaison 12.Preferably, the discharged end portion 4 of the second reinforcing bar 2 'has a length greater than or substantially equal to the longitudinal length of the tapping 13 provided on the connecting sleeve 12.

Avantageusement, la portion d'extrémité du manchon de liaison 12 destinée à être tournée vers la première barre d'armature 2 est évasée de manière à faciliter l'insertion de la première barre d'armature 2 dans le manchon de liaison 12.Advantageously, the end portion of the connecting sleeve 12 intended to be turned towards the first reinforcing bar 2 is flared so as to facilitate the insertion of the first reinforcing bar 2 into the connecting sleeve 12.

Un deuxième procédé d'assemblage d'une armature pour béton armé est décrit ci-après en se référant principalement aux figures 5 et 6.A second method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 5 and 6 .

Ce deuxième procédé d'assemblage, également appelé liaison LCE, comprend en outre les étapes suivantes consistant à :

  • prévoir une première et une deuxième barres d'armature 2, 2' selon l'invention,
  • prévoir un manchon de liaison 12 comportant un taraudage 13 agencé pour coopérer avec les filetages cylindriques 8, 11 prévus sur les portions d'extrémité 4, 10 des première et deuxième barres d'armature 2, 2',
  • prévoir un écrou de verrouillage 15 destiné à coopérer d'une part avec le filetage 11 prévu sur la portion d'extrémité opposée 10 de la première barre d'armature 2 et d'autre part à avec une première extrémité du manchon de liaison 12,
  • prévoir un écrou de butée 16 destiné à coopérer d'une part avec le filetage 8 prévu sur la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' et d'autre part avec une deuxième extrémité du manchon de liaison 12,
  • visser l'écrou de verrouillage 15 sur la portion d'extrémité opposée 10 de la première barre d'armature 2 (voir la figure 5),
  • immobiliser la première barre d'armature 2 équipée de l'écrou de verrouillage 15 dans une tranche d'un ouvrage en béton armé 14,
  • visser l'écrou de butée 16 sur la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' jusqu'à l'extrémité du filetage 8 tournée vers la portion d'extension 3 correspondante,
  • visser le manchon de liaison 12 sur la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' (voir la figure 5),
  • abouter la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' contre la portion d'extrémité opposée 10 de la première barre d'armature 2,
  • entraîner en rotation le manchon de liaison 12 par rapport à la deuxième barre d'armature 2' de telle sorte que le taraudage 13 du manchon de liaison 12 coopère avec le filetage 11 de la portion d'extrémité opposée 10 de la première barre d'armature 2, et ce jusqu'à ce que la première extrémité du manchon de liaison 12 vienne en butée contre l'écrou de verrouillage 15 (voir la figure 6), et
  • entraîner en rotation l'écrou de butée 16 par rapport à la deuxième barre d'armature 2' jusqu'à ce qu'il vienne en butée contre la deuxième extrémité du manchon de liaison 12.
This second assembly method, also called LCE bonding, further comprises the following steps:
  • provide a first and a second reinforcing bar 2, 2 'according to the invention,
  • provide a connecting sleeve 12 having a tapping 13 arranged to cooperate with the cylindrical threads 8, 11 provided on the end portions 4, 10 of the first and second reinforcing bars 2, 2 ',
  • providing a locking nut 15 for cooperating on the one hand with the thread 11 provided on the opposite end portion 10 of the first reinforcing bar 2 and on the other hand with a first end of the connecting sleeve 12,
  • provide a stop nut 16 intended to cooperate on the one hand with the threading 8 provided on the pushed end portion 4 of the second reinforcing bar 2 'and on the other hand with a second end of the connecting sleeve 12,
  • screw the locking nut 15 onto the opposite end portion 10 of the first reinforcing bar 2 (see figure 5 )
  • immobilizing the first reinforcing bar 2 equipped with the locking nut 15 in a slice of a reinforced concrete structure 14,
  • screw the stop nut 16 onto the pushed end portion 4 of the second reinforcing bar 2 'to the end of the thread 8 turned towards the corresponding extension portion 3,
  • screw the connecting sleeve 12 onto the pushed end portion 4 of the second reinforcing bar 2 '(see figure 5 )
  • abut the pushed end portion 4 of the second reinforcing bar 2 'against the opposite end portion 10 of the first reinforcing bar 2,
  • rotating the connecting sleeve 12 relative to the second reinforcing bar 2 'so that the tapping 13 of the connecting sleeve 12 cooperates with the thread 11 of the opposite end portion 10 of the first bar reinforcement 2, and this until the first end of the connecting sleeve 12 abuts against the locking nut 15 (see FIG. figure 6 ), and
  • rotating the abutment nut 16 relative to the second reinforcing bar 2 'until it abuts against the second end of the connecting sleeve 12.

De préférence, la portion d'extrémité refoulée 4 de la deuxième barre d'armature 2' présente une longueur supérieure ou sensiblement égale à la somme de la longueur longitudinale du taraudage 13 prévu sur le manchon de liaison 12 et de la hauteur de l'écrou de butée 16.Preferably, the discharged end portion 4 of the second reinforcing bar 2 'has a length greater than or substantially equal to the sum of the longitudinal length of the tapping 13 provided on the connecting sleeve 12 and the height of the thrust nut 16.

La figure 8 représente une barre d'armature selon un deuxième mode de réalisation de l'invention qui diffère de celui représenté sur les figures 1 à 7 essentiellement en ce que le cylindre circonscrit à la portion d'extension 3 et d'axe parallèle à l'axe longitudinal de la portion d'extension 3 présente un diamètre inférieur au diamètre à fond de filet Df du filetage cylindrique 8. En d'autres termes, comme montré sur la figure 8, la projection de la portion d'extension 3 sur un plan orthogonal à l'axe longitudinal de la barre d'armature 2 définit une première surface S1 et la projection de la section transversale de la portion d'extrémité refoulée 4 au niveau du fond de filet du filetage cylindrique 8 sur ledit plan définit une deuxième surface S2, la première surface S1 étant inscrite dans la deuxième surface S2.The figure 8 represents a reinforcing bar according to a second embodiment of the invention which differs from that shown on the Figures 1 to 7 essentially in that the cylinder circumscribing the extension portion 3 and having an axis parallel to the longitudinal axis of the extension portion 3 has a diameter smaller than the diameter at the bottom of the thread Df of the cylindrical thread 8. other words, as shown on the figure 8 the projection of the extension portion 3 on a plane orthogonal to the longitudinal axis of the reinforcing bar 2 defines a first surface S1 and the projection of the cross section of the discharged end portion 4 at the thread bottom of the cylindrical thread 8 on said plane defines a second surface S2, the first surface S1 being inscribed in the second surface. S2.

Ainsi, selon ce mode de réalisation de l'invention, la section transversale de la portion d'extrémité refoulée 4 au niveau du fond de filet du filetage cylindrique 8 est supérieure à chaque section transversale de la portion d'extension 3, et plus précisément à chaque section de la portion d'extension 3 orthogonale à l'axe longitudinal de la portion d'extension 3.Thus, according to this embodiment of the invention, the cross section of the end-end portion 4 at the bottom of the thread of the cylindrical thread 8 is greater than each cross-section of the extension portion 3, and more precisely at each section of the extension portion 3 orthogonal to the longitudinal axis of the extension portion 3.

Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de cette barre d'armature, décrite ci-dessus à titre d'exemple, elle en embrasse au contraire toutes les variantes de réalisation limitées par les revendications annexées.As goes without saying, the invention is not limited to the sole embodiment of this reinforcing bar, described above as an example, it encompasses all the variants of embodiment limited by the appended claims.

Claims (12)

  1. A high-adherence reinforcing bar (2) for reinforced concrete, comprising:
    - an extension portion (3) including, on its outer surface, catching protrusions (6, 7) intended to promote the adherence between the reinforcing bar and the concrete,
    - an upset end portion (4) provided with a threading (8) intended to cooperate with a tapping (12) arranged in a connection sleeve (11), the root-diameter of the threading (8) being greater than or equal to the nominal diameter of the reinforcing bar, and the upset end portion (4) includes a first part (41) substantially cylindrical, and at least one second part (42) disposed between the first part and the extension portion, the second part (42) having a general section decreasing towards the extension portion, characterized in that the second part (42) has a length greater than or equal to the length of the first part (41).
  2. The reinforcing bar according to claim 1, wherein the second part (42) of the upset end portion (4) has a length greater than or equal to the nominal diameter of the reinforcing bar.
  3. The reinforcing bar according to claim 1 or 2, wherein the second part (42) of the upset end portion (4) includes at least a first substantially frustoconical portion having its largest base facing the first part (41) of the upset end portion (4), and a second substantially frustoconical portion disposed between the first substantially frustoconical portion and the extension portion, the second substantially frustoconical portion having its largest base facing the first substantially frustoconical portion.
  4. The reinforcing bar according to claim 3, wherein the second substantially frustoconical portion has a length greater than or equal to the length of the first substantially frustoconical portion.
  5. An assembly for reinforcement for reinforced concrete, comprising a reinforcing bar (2) according to any of claims 1 to 4, and a connection sleeve (11) including a tapping (12) arranged to cooperate with the threading (8) provided on the upset end portion (4).
  6. The assembly according to claim 5, wherein the upset end portion (4) has a length greater than or substantially equal to the longitudinal length of the tapping (12) provided on the connection sleeve (11).
  7. The assembly according to claim 5 or 6, which further comprises a stop nut (15) intended to cooperate, on the one hand, with the threading (8) provided on the upset end portion (4) and, on the other hand, with the connection sleeve (11).
  8. The assembly according to claim 7, wherein the upset end portion (4) has a length greater than or substantially equal to the sum of the longitudinal length of the tapping (12) provided on the connection sleeve (11) and of the height of the stop nut (15).
  9. A method for assembling a reinforcement for reinforced concrete, comprising the following steps:
    - providing a first and a second reinforcing bars (2, 2') according to any of claims 1 to 4, the first and the second reinforcing bars (2, 2') each comprising an upset end portion (4) and an opposite end portion (10) located opposite to the upset end portion (4) and provided with a threading (11),
    - providing a connection sleeve (12) including a tapping (13) arranged to cooperate with the threadings (8, 11) provided on the end portions (4, 10) of the first and second reinforcing bars,
    - screwing the connection sleeve (12) on the upset end portion (4) of the second reinforcing bar (2'),
    - abutting the upset end portion (4) of the second reinforcing bar (2') against the opposite end portion (10) of the first reinforcing bar (2),
    - driving in rotation the connection sleeve (12) relative to the second reinforcing bar (2') so that the tapping (13) of the connection sleeve (12) cooperates with the opposite end portion (10) of the first reinforcing bar (2').
  10. The assembling method according to claim 9, which further comprises:
    - a step carried out prior to the screwing of the connection sleeve (12) on the upset end portion (4) of the second reinforcing bar (2') and consisting of screwing a stop nut (16) on the upset end portion (4) of the second reinforcing bar (2'), and
    - a step carried out after the step of driving in rotation the connection sleeve (12) and consisting of driving in rotation the stop nut (16) relative to the second reinforcing bar (2') until the stop nut abuts against the connection sleeve (12).
  11. A method of manufacturing a high-adherence reinforcing bar for reinforced concrete according to any of claims 1 to 4, comprising the following steps:
    - providing a reinforcing element (2) comprising an extension portion (3) provided, on its outer surface, with catching protrusions (6, 7), and an end portion,
    - cold-upsetting the end portion so as to form a first part (41') substantially cylindrical, and at least one second part (42') disposed between the first part and the extension portion, the second part (42') having a general section decreasing towards the extension portion, the second part (42') having a length greater than or equal to the length of the first part (41'),
    - arranging on the end portion a threading having a root-diameter greater than or equal to the nominal diameter of the reinforcing element.
  12. The manufacturing method according to claim 11, wherein the upsetting step is carried out at variable speed.
EP14729702.2A 2013-05-29 2014-05-15 Reinforcing rod with high adherence for reinforced concrete Active EP3004483B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1354879A FR3006351B1 (en) 2013-05-29 2013-05-29 HIGH ADHESIVE REINFORCEMENT BAR FOR ARMED CONCRETE
PCT/FR2014/051125 WO2014191648A1 (en) 2013-05-29 2014-05-15 Reinforcing rod with high adherence for reinforced concrete

Publications (2)

Publication Number Publication Date
EP3004483A1 EP3004483A1 (en) 2016-04-13
EP3004483B1 true EP3004483B1 (en) 2017-11-15

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EP14729702.2A Active EP3004483B1 (en) 2013-05-29 2014-05-15 Reinforcing rod with high adherence for reinforced concrete

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EP (1) EP3004483B1 (en)
CN (1) CN105473798B (en)
FR (1) FR3006351B1 (en)
WO (1) WO2014191648A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3034115B1 (en) * 2015-03-25 2017-05-05 Jacques Rivoire ANTISISMIC TENDER SYSTEM FOR THE SOLIDARIZATION OF CONCRETE FOUNDATIONS OF A WORK
WO2020183071A1 (en) * 2019-03-13 2020-09-17 Bartec Group Method for preparing a reinforcing rod for reinforced concrete

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Publication number Priority date Publication date Assignee Title
DE2205772B2 (en) * 1972-02-08 1975-08-28 Josef Dipl.-Ing. 8900 Augsburg Schmid Device for connecting the coaxially arranged reinforcing bars of two precast concrete parts
FR2639054B2 (en) 1988-02-03 1992-07-03 Techniport Sa IMPROVEMENTS RELATING TO THE MECHANICAL CONNECTION OF CONCRETE ROUND, PROCESS FOR PRODUCING SUCH CONNECTIONS AND CONCRETE ROUND OBTAINED BY IMPLEMENTING SAID PROCESS
CN1060133A (en) * 1990-09-24 1992-04-08 胡海涛 A kind of reinforcement screw connection member of gaining in strength
FI922525A0 (en) * 1992-06-01 1992-06-01 Tartuntamarkkinointi Oy FOERFARANDE FOER SKAERNING AV EN GAENGA I EN STAONG.
NL1005655C2 (en) * 1997-03-27 1998-09-29 Hendrik Van De Riet System for connecting objects.
US5967691A (en) * 1997-12-02 1999-10-19 Dayton Superior Corporation Quick connect rebar splice
NL1012410C2 (en) * 1999-06-22 2001-01-10 R C M Ankertec B V Concrete construction with anchor rods and anchor rod.
CN2900670Y (en) * 2006-04-19 2007-05-16 评辉营造股份有限公司 Rebar splicing adjustment device

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Also Published As

Publication number Publication date
CN105473798A (en) 2016-04-06
FR3006351A1 (en) 2014-12-05
WO2014191648A1 (en) 2014-12-04
CN105473798B (en) 2017-07-21
FR3006351B1 (en) 2015-05-29
EP3004483A1 (en) 2016-04-13

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