EP0563490A1 - Method of making mechanical barjoints, joint obtained by this method, bar making possible this method and installation for the preparation of the bars - Google Patents

Method of making mechanical barjoints, joint obtained by this method, bar making possible this method and installation for the preparation of the bars Download PDF

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Publication number
EP0563490A1
EP0563490A1 EP92440073A EP92440073A EP0563490A1 EP 0563490 A1 EP0563490 A1 EP 0563490A1 EP 92440073 A EP92440073 A EP 92440073A EP 92440073 A EP92440073 A EP 92440073A EP 0563490 A1 EP0563490 A1 EP 0563490A1
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EP
European Patent Office
Prior art keywords
concrete
diameter
thread
threading
rolling
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Granted
Application number
EP92440073A
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German (de)
French (fr)
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EP0563490B1 (en
Inventor
Alain Bernard
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A MURE ETS
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Techniport SA
A MURE ETS
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Publication of EP0563490A1 publication Critical patent/EP0563490A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • 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 invention relates to a method for producing a mechanical connection of concrete rods, to such a connection obtained by the method, to a concrete rod authorizing the implementation of said method, as well as to an installation for preparation of concrete bars. It will find its application in particular in the construction of elements, buildings, or buildings of concrete.
  • connection by crimping a sleeve is used which is crimped on the two ends of the rounds to be bonded.
  • This technique avoids having to rotate one of the circles but nevertheless presents high risks of slipping, due to the crimping, which is difficult to control.
  • its implementation is often difficult on a site because it must be able to intervene with a crimping tool, where the connection is to be made.
  • the aim of the present invention is to propose a method for producing mechanical connections of concrete reinforcing bars which provide total security at the level of the connection and which, for the same dimensioning, withstand dynamic stresses with an alternating traction-compression effect. .
  • One of the aims of the present invention is to propose a method for producing a mechanical connection of a concrete reinforcing rod which makes it possible to produce, at the end of the concrete reinforcing rod, a reinforced zone such that the diameter at the bottom of the thread is equal. or greater than the nominal cross section of the concrete reinforcing bar, but which requires a cold discharge from the lower end, and consequently employing less significant discharge forces.
  • Another object of the present invention is to propose a process for producing a mechanical connection of a concrete reinforcing rod which implements a thread of very good quality with good tolerances which does not reduce the strength of the end.
  • the threading is carried out by rolling, which avoids cutting the fibers of the bar and causing break initiations during dynamic forces.
  • Another object of the present invention is to provide a mechanical connection of concrete rods as well as a concrete rod authorizing the implementation of the method of the present invention.
  • Another object of the present invention is to provide an installation for preparing such concrete reinforcing bars which is economical, of a reasonable investment and of reduced size, given the forces employed.
  • the method for producing a mechanical connection of a concrete reinforcing rod which will find its application in particular in the field of concrete construction, by which at least one concrete reinforcing rod is linked to another concrete reinforcing rod or at an anchor point, by means of a threaded connection sleeve, the said concrete rod having a nominal section ⁇ , at least one reinforced end, turned back and threaded, such that the diameter at the bottom of the thread is equal or greater than the nominal cross-section ⁇ of the round, is characterized by the fact that the reinforced end is carried out by double discharge, a first axial allowing the diameter of the concrete round to be increased, a second radial during threading by the rolling technique.
  • the method of the invention makes it possible to achieve a mechanical connection of a concrete ring to an anchor point or a mechanical connection of two concrete rings end to end substantially coaxially.
  • the concrete reinforcing rod allowing the implementation of the process of the invention is characterized by the fact that at least one of its ends carries a double discharge such that the diameter at the bottom of the thread is greater than or equal to the nominal section of the concrete reinforcing bar.
  • FIG. 1 shows a mechanical connection of a concrete reinforcing rod produced according to the method of the present invention.
  • FIGS. 2a to 2d show the different stages of the process for producing the mechanical connection of a concrete reinforcing bar according to the invention, and more precisely the work of the end of the concrete reinforcing bar used in the method.
  • Figure 3 shows an enlarged sectional view showing the dimensional characteristics of the end of the concrete rod of Figure 2d.
  • FIG. 4 schematically shows the arrangement of the different means constituting the installation for preparing concrete reinforcing bars according to the present invention.
  • the invention relates to a process for producing a mechanical connection of a concrete ring, a connection thus obtained as well as a concrete ring authorizing the implementation of said process and an installation for preparing such rounds.
  • Figure 1 shows an embodiment of a mechanical connection for ensuring the connection of two concrete rods 1 and 2, end to end, substantially coaxially. Furthermore, this connection implements a tapped sleeve 3 for connection, capable of receiving respectively on one side the threaded end 4 of the first concrete ring 1, and on the other side the end 5 of the second concrete ring 2.
  • Each of the concrete reinforcing bars is determined by calculation and then chosen from a standardized or regulated range.
  • the characteristic of a concrete reinforcing rod resides essentially in an imposition of weight and section, these being rolled taking into account these imperatives.
  • the concrete ring has on its outer face ribs or ribs 6 which create protrusions allowing the immobilization in translation of the round in the concrete when it is embedded in the latter.
  • the round has on the one hand a nominal section characterized by ⁇ , which is in a way the section of the core of the round, and a diameter on ribs or ribs marked ⁇ c , as particularly illustrated in the figure 2a.
  • each concrete rod to be bonded 1, 2 has at least one reinforced end 4, 5, turned back and threaded, such that the diameter at the bottom of the thread d2 is equal to or greater than the nominal section ⁇ of the round. This is particularly illustrated in Figures 2d and 3.
  • the reinforced end 4, 5 is carried out, by double delivery, a first axial 7, making it possible to increase the diameter of the concrete reinforcing bar, and a second radial 8 during threading by a rolling technique. .
  • the first axial discharge 7 is carried out prior to threading, and the end of the concrete round bar 1, 2 is cold pressed, to be bonded in order to produce a reinforced zone 7 corresponding at least substantially at the diameter d4 with thread flanks.
  • the second radial discharge 8 is practiced by making a thread 9 on the said reinforced zone 7 by rolling so that the diameter at the bottom of the thread d2 is equal to or greater than the nominal section ⁇ of the round.
  • the upsets 7, 8 are carried out along the length of the thread 9 of said end 4, 5.
  • FIG. 2a a first peeling of the end of the round to be reinforced is shown to rid it of its ribs or ribs and to give this end an acceptable cylindricity.
  • This peeling is identified by the diameter d0 close to or very slightly less than the diameter ⁇ .
  • the first discharge 7 is carried out at a rate of increase in the diameter of the neighboring end from 15 to 20%.
  • This step brings the diameter d0 to a diameter greater than d3, itself greater than the diameter ⁇ of the circle.
  • This cold delivery is achieved by carrying out an axial push on the end according to arrow 10.
  • the driven surface 7 is drawn up, in particular to calibrate it, at the diameter d4 which will make it possible to carry out the desired threading by rolling.
  • this diameter d4 corresponds to the diameter with flanks of the thread shown in Figure 3.
  • FIG. 2d in which the latter, after a double axial delivery 7 and radial 8, shows a reinforced end such that the diameter at the bottom of the thread d2 is equal or greater at nominal section ⁇ of the round.
  • the end 4 and / or 5 of the concrete reinforcing bar 1 and / or 2 reinforced by discharge is prestressed.
  • This prestressing makes it possible to cancel all the displacements and elongations of the concrete reinforcing bars and in particular of their ends during the safety tests implemented. It is carried out after threading, mechanically by compression of said threaded end.
  • the sleeve will be suitable for receiving a single round but will have an external configuration in the form of an anchoring sleeve.
  • the M24 thread was produced in steps of 3 by rolling.
  • the outside diameter d1 then being between 23.577 and 23.952 mm, and the diameter at the bottom of the thread d2 then corresponding to 20.704 mm is greater than 20 mm of the nominal section of the round HA20.
  • the necessary axial discharge generates a displacement of a mass of 18 g or a length of 8 mm.
  • the axial discharge is therefore reduced from 50 to 18 g, ie a ratio reduced by 2.8.
  • the quality of the thread makes it possible to abandon the 8g tolerance and to implement 5 or 6 g tolerances.
  • FIG. 4 schematically shows an installation for preparing concrete rods to authorize the implementation of the method of the present invention.
  • the installation firstly includes a zone for supplying the concrete reinforcing rod to be prepared.
  • a vice 10 which will be able to tighten the concrete rod 1 and move it towards the installation.
  • means 11 are provided for immobilizing the circle to be prepared. These means are for example constituted by a vice 11 of great length, in particular furnished with coating of the natural rubber or polyurethane type to avoid injuries to the concrete reinforcing bars.
  • the clamps 10 and 11 are of the hydraulic type and displaceable horizontally relative to the longitudinal axis 22 of supply of the concrete rods.
  • the different arrows in FIG. 4 simulate the operation of the system and in particular the following operation: the vice 10 clamps the concrete ring, the immobilization vice 11 opens, the vice 10 moves forward, the vice 11 tightens on the round, the vice 10 becomes free and moves back to prepare for a new cycle.
  • the installation will present means 16, 17 for listening to the scope to be driven back and / or to be threaded. These means will be provided for vertical and horizontal movement in order to be able to bring the peeling tool in the longitudinal axis 22 of the concrete rod to be worked.
  • the installation will include, in the same spirit, means 18 for carrying out a threading by rolling, that is to say that the unit 18 will be able to be moved to be placed coaxially in the axis 22 blocked in the means 11.
  • the installation will also have a unit 19 for screwing and unscrewing a sleeve allowing the said constraint to be implemented in the tool 14.
  • the main advantage of the installation of the present invention lies in the fact that all the operations are carried out without having to move the rebar or reposition it and thus avoid all the positioning and centering which would be compulsory for carrying out the various machining steps. .
  • a reinforcement by double discharge, a first axial by means of cold discharge means, and a second radial during threading by the rolling tool 18 can be produced on the concrete reinforcing rod, and more precisely on the ends.
  • This procedure makes it possible to reduce the cold delivery pressures, to facilitate cold delivery by working on a machined diameter, to eliminate the hardened surface, that is to say the skin. of the concrete reinforcing bar, and its ribs thanks to the crimping.

Abstract

The invention relates to a method for making a mechanical concrete bar joint and to such a mechanical joint, and to a concrete bar permitting the implementation of the method, and to an installation for preparing concrete bars. It will be used in the concrete construction sector. The method involves joining at least one concrete bar (1) to another concrete bar (2), or to an anchoring point, by way of a tapped joining sleeve (3), the said concrete bar having a nominal cross-section PHI , and at least one reinforced end (4), turned back and threaded, such that the thread root diameter d2 is equal to or greater than the nominal cross-section PHI of the bar. According to the invention, the reinforced end (4) is obtained by a double upsetting, a first axial one permitting an increase in the diameter of the concrete bar, and a second radial one during the threading by means of a rolling technique. <IMAGE>

Description

L'invention est relative à un procédé de réalisation d'une liaison mécanique de ronds à béton, à une telle liaison obtenue par le procédé, à un rond à béton autorisant la mise en oeuvre du dit procédé, ainsi qu'à une installation de préparation de ronds à béton. Elle trouvera notamment son application dans le domaine de la construction d'éléments, de bâtiments, ou d'édifices en béton.The invention relates to a method for producing a mechanical connection of concrete rods, to such a connection obtained by the method, to a concrete rod authorizing the implementation of said method, as well as to an installation for preparation of concrete bars. It will find its application in particular in the construction of elements, buildings, or buildings of concrete.

Dans ce domaine, il est courant d'utiliser des liaisons mécaniques pour lier des ronds à béton afin de pouvoir assurer la transmission de l'effort de traction de façon continue.In this field, it is common to use mechanical connections to link concrete rods in order to be able to ensure the transmission of the tensile force continuously.

De nos jours, différentes solutions sont proposées par les constructeurs, et principalement on utilise soit une liaison à sertissage, soit une liaison par filetage.Nowadays, different solutions are proposed by the manufacturers, and mainly one uses either a crimp connection, or a connection by thread.

Dans le cas de la liaison par sertissage, on utilise un manchon que l'on vient sertir sur les deux extrémités des ronds à liaisonner. Cette technique évite de devoir mettre en rotation l'un des ronds mais présente toutefois des risques élevés de glissement, du fait du sertissage, difficilement contrôlable. En outre, sa mise en oeuvre est souvent mal aisée sur un chantier car il faut pouvoir intervenir avec un outillage de sertissage, là où la liaison est à effectuer.In the case of the connection by crimping, a sleeve is used which is crimped on the two ends of the rounds to be bonded. This technique avoids having to rotate one of the circles but nevertheless presents high risks of slipping, due to the crimping, which is difficult to control. In addition, its implementation is often difficult on a site because it must be able to intervene with a crimping tool, where the connection is to be made.

De plus en plus, la liaison mécanique par filetage a la préférence des utilisateurs. Dans une telle liaison, on réunit deux ronds à béton, sensiblement coaxialement, par l'intermédiaire d'un manchon taraudé de liaison. Cette solution est également applicable lorsqu'il est nécessaire de liaisonner un rond à béton à un point d'ancrage.Increasingly, mechanical connection by thread is preferred by users. In such a connection, two concrete rods are joined together, substantially coaxially, by means of a tapped connection sleeve. This solution is also applicable when it is necessary to link a concrete ring to an anchor point.

Par ailleurs, pour améliorer la qualité de la liaison mécanique de ronds à béton par filetage, il a été mis au point un procédé de réalisation d'une telle liaison dans lequel, préalablement au filetage, on refoule à froid l'extrémité des ronds à béton à liaisonner, afin de réaliser une zone renforcée d'un diamètre supérieur à la section nominale du rond, puis on taille le filetage sur la dite zone renforcée tel que le diamètre à fond de filet soit égal ou supérieur à la section nominale du rond à béton.Furthermore, to improve the quality of the mechanical connection of concrete rods by threading, a method has been developed for producing such a connection in which, prior to threading, the end of the rods is cold-pressed. concrete to be bonded, in order to produce a reinforced zone with a diameter greater than the nominal section of the round, then the thread is cut on the said reinforced zone such that the diameter at the bottom of the thread is equal to or greater than the nominal section of the concrete reinforcing bar.

Un tel procédé donne satisfaction dans la plupart des constructions et requiert un usinage très sommaire. En effet, l'extrémité du rond à béton, avec ses côtes ou nervures est refoulée à froid dans une matrice, puis le filetage est réalisé sur ce refoulement brut par taillage.Such a method is satisfactory in most constructions and requires very basic machining. Indeed, the end of the concrete reinforcing bar, with its ribs or ribs is cold pressed into a die, then the threading is carried out on this raw discharge by cutting.

Bien que le refoulement soit généralement limité à un taux d'accroissement du diamètre de l'ordre de 30 %, il est nécessaire néanmoins de mettre en oeuvre des pressions lors du refoulement de très forte valeur pouvant aller jusqu'à 400 voire même 500 bars.Although the discharge is generally limited to a rate of increase in diameter of the order of 30% , it is nevertheless necessary to apply pressures during the discharge of very high value which can range up to 400 or even 500 bars. .

Par ailleurs, il est à noter que de plus en plus, les édifices en béton sont soumis à des efforts dynamiques, et dans ces conditions, les liaisons mécaniques de ronds à béton sont soumises à des effets de traction-compression alternés. Aussi, la fragilité de telles liaisons est augmentée et il est nécessaire de prévoir ces sollicitations pour qu'elles résistent sur le plan de l'insécurité.In addition, it should be noted that more and more, concrete buildings are subjected to dynamic forces, and under these conditions, the mechanical connections of concrete rounds are subjected to effects of alternating tension-compression. Also, the fragility of such connections is increased and it is necessary to provide these stresses so that they resist in terms of insecurity.

Le but de la présente invention est de proposer un procédé de réalisation de liaisons mécaniques de ronds à béton qui apportent une sécurité totale au niveau de la liaison et qui, pour un même dimensionnement, supportent des sollicitations dynamiques avec un effet de traction-compression alterné.The aim of the present invention is to propose a method for producing mechanical connections of concrete reinforcing bars which provide total security at the level of the connection and which, for the same dimensioning, withstand dynamic stresses with an alternating traction-compression effect. .

Un des buts de la présente invention est de proposer un procédé de réalisation d'une liaison mécanique de rond à béton qui permette de réaliser, à l'extrémité du rond à béton, une zone renforcée telle que le diamètre à fond de filet soit égal ou supérieur à la section nominale du rond à béton, mais qui nécessite un refoulement à froid de l'extrémité moindre, et par conséquent mettant en oeuvre des forces de refoulement moins importantes.One of the aims of the present invention is to propose a method for producing a mechanical connection of a concrete reinforcing rod which makes it possible to produce, at the end of the concrete reinforcing rod, a reinforced zone such that the diameter at the bottom of the thread is equal. or greater than the nominal cross section of the concrete reinforcing bar, but which requires a cold discharge from the lower end, and consequently employing less significant discharge forces.

Un autre but de la présente invention est de proposer un procédé de réalisation d'un liaison mécanique de rond à béton qui met en oeuvre un filetage de très bonne qualité avec de bonnes tolérances qui n'amoindrit pas la résistance de l'extrémité.Another object of the present invention is to propose a process for producing a mechanical connection of a concrete reinforcing rod which implements a thread of very good quality with good tolerances which does not reduce the strength of the end.

En particulier, le filetage est réalisé par roulage, ce qui évite de tailler les fibres de la barre et de provoquer des amorces de rupture lors des efforts dynamiques.In particular, the threading is carried out by rolling, which avoids cutting the fibers of the bar and causing break initiations during dynamic forces.

Un autre but de la présente invention est de proposer une liaison mécanique de ronds à béton ainsi qu'un rond à béton autorisant la mise en oeuvre du procédé de la présente invention.Another object of the present invention is to provide a mechanical connection of concrete rods as well as a concrete rod authorizing the implementation of the method of the present invention.

Par ailleurs, un autre but de la présente invention est de proposer une installation de préparation de tels ronds à béton qui soit économique, d'un investissement raisonnable et de dimension réduite étant données les forces mises en oeuvre.Furthermore, another object of the present invention is to provide an installation for preparing such concrete reinforcing bars which is economical, of a reasonable investment and of reduced size, given the forces employed.

D'autres buts et avantages de la présente invention apparaîtront au cours de la description qui va suivre qui n'est cependant donnée qu'à titre indicatif et qui n'a pas pour but de la limiter.Other objects and advantages of the present invention will appear during the description which follows which is however given only for information and which is not intended to limit it.

Selon l'invention, le procédé de réalisation d'une liaison mécanique de rond à béton, qui trouvera notamment son application dans le domaine de la construction en béton, par lequel on liaisonne au moins un rond à béton à un autre rond à béton ou à un point d'ancrage, par l'intermédiaire d'un manchon taraudé de liaison, le dit rond à béton présentant une section nominale Φ, au moins une extrémité renforcée, refoulée et filetée, telle que le diamètre à fond de filet soit égal ou supérieur à la section nominale Φ du rond, est caractérisé par le fait que l'on effectue l'extrémité renforcée par double refoulement, un premier axial permettant d'accroître le diamètre du rond à béton, un second radial lors du filetage par la technique de roulage.According to the invention, the method for producing a mechanical connection of a concrete reinforcing rod, which will find its application in particular in the field of concrete construction, by which at least one concrete reinforcing rod is linked to another concrete reinforcing rod or at an anchor point, by means of a threaded connection sleeve, the said concrete rod having a nominal section Φ, at least one reinforced end, turned back and threaded, such that the diameter at the bottom of the thread is equal or greater than the nominal cross-section Φ of the round, is characterized by the fact that the reinforced end is carried out by double discharge, a first axial allowing the diameter of the concrete round to be increased, a second radial during threading by the rolling technique.

Le procédé de l'invention permet d'aboutir à une liaison mécanique d'un rond à béton à un point d'ancrage ou à une liaison mécanique de deux ronds à béton bout à bout sensiblement coaxialement.The method of the invention makes it possible to achieve a mechanical connection of a concrete ring to an anchor point or a mechanical connection of two concrete rings end to end substantially coaxially.

Par ailleurs, le rond à béton autorisant la mise en oeuvre du procédé de l'invention est caractérisé par le fait qu'au moins une de ses extrémités porte un double refoulement tel que le diamètre à fond de filet soit supérieur ou égal à la section nominale du rond à béton.Furthermore, the concrete reinforcing rod allowing the implementation of the process of the invention is characterized by the fact that at least one of its ends carries a double discharge such that the diameter at the bottom of the thread is greater than or equal to the nominal section of the concrete reinforcing bar.

L'installation de préparation de rond à béton selon l'invention est quant à elle caractérisée par le fait qu'elle présente :

  • a) des moyens d'immobilisation du rond à béton à préparer,
  • b) des moyens pour refouler à froid axialement l'extrémité du rond à béton,
  • c) des moyens pour écrouter la portée à refouler et/ou à fileter,
  • d) des moyens pour réaliser un filetage par roulage de la dite extrémité,
les dits moyens b), c), d), étant déplaçables pour être placés coaxialement dans l'axe du rond à béton bloqué dans les moyens a).The installation for preparing concrete reinforcing bars according to the invention is characterized by the fact that it has:
  • a) means for immobilizing the concrete reinforcing rod to be prepared,
  • b) means for axially cold pressing the end of the concrete ring,
  • c) means for listening to the staff to be driven back and / or to be threaded,
  • d) means for producing a thread by rolling said end,
said means b), c), d), being movable to be placed coaxially in the axis of the concrete block blocked in means a).

La présente invention sera mieux comprise à la lecture de la description suivante accompagnée des dessins qui en font partie intégrante.The present invention will be better understood on reading the following description accompanied by the drawings which form an integral part thereof.

La figure 1 montre une liaison mécanique de rond à béton réalisée selon le procédé de la présente invention.FIG. 1 shows a mechanical connection of a concrete reinforcing rod produced according to the method of the present invention.

Les figures 2a à 2d montrent les différentes étapes du procédé de réalisation de la liaison mécanique de rond à béton selon l'invention, et plus précisément le travail de l'extrémité du rond à béton mis en oeuvre dans le procédé.FIGS. 2a to 2d show the different stages of the process for producing the mechanical connection of a concrete reinforcing bar according to the invention, and more precisely the work of the end of the concrete reinforcing bar used in the method.

La figure 3 montre une vue en coupe, agrandie, montrant les caractéristiques dimensionnelles de l'extrémité du rond à béton de la figure 2d.Figure 3 shows an enlarged sectional view showing the dimensional characteristics of the end of the concrete rod of Figure 2d.

La figure 4 montre schématiquement l'agencement des différents moyens constituant l'installation de préparation de rond à béton selon la présente invention.FIG. 4 schematically shows the arrangement of the different means constituting the installation for preparing concrete reinforcing bars according to the present invention.

L'invention vise un procédé de réalisation d'une liaison mécanique de rond à béton, une liaison ainsi obtenue ainsi qu'un rond à béton autorisant la mise en oeuvre du dit procédé et une installation de préparation de tels ronds.The invention relates to a process for producing a mechanical connection of a concrete ring, a connection thus obtained as well as a concrete ring authorizing the implementation of said process and an installation for preparing such rounds.

Elle trouvera notamment son application dans le domaine de la construction en béton.It will find its application in particular in the field of concrete construction.

La figure 1 montre un exemple de réalisation d'une liaison mécanique permettant d'assurer la liaison de deux ronds à béton 1 et 2, bout à bout, sensiblement coaxialement. Par ailleurs, cette liaison met en oeuvre un manchon taraudé 3 de liaison, apte à recevoir respectivement d'un côté l'extrémité filetée 4 du premier rond à béton 1, et de l'autre côté l'extrémité 5 du second rond à béton 2.Figure 1 shows an embodiment of a mechanical connection for ensuring the connection of two concrete rods 1 and 2, end to end, substantially coaxially. Furthermore, this connection implements a tapped sleeve 3 for connection, capable of receiving respectively on one side the threaded end 4 of the first concrete ring 1, and on the other side the end 5 of the second concrete ring 2.

Chacun des ronds à béton est déterminé par le calcul puis choisi parmi une gamme normalisée ou réglementée. La caractéristique d'un rond à béton réside essentiellement dans une imposition de poids et de section, ceux-ci étant laminés compte tenu de ces impératifs.Each of the concrete reinforcing bars is determined by calculation and then chosen from a standardized or regulated range. The characteristic of a concrete reinforcing rod resides essentially in an imposition of weight and section, these being rolled taking into account these imperatives.

D'une façon générale, le rond à béton présente sur sa face extérieure des côtes ou nervures 6 qui créent de protubérances permettant l'immobilisation en translation du rond dans le béton lorsqu'il est noyé dans ce dernier.In general, the concrete ring has on its outer face ribs or ribs 6 which create protrusions allowing the immobilization in translation of the round in the concrete when it is embedded in the latter.

Dans ces conditions, le rond présente d'une part une section nominale caractérisée par Φ, qui est en quelque sorte la section de l'âme du rond, et un diamètre sur côtes ou nervures repéré Φc, comme l'illustre particulièrement la figure 2a.Under these conditions, the round has on the one hand a nominal section characterized by Φ, which is in a way the section of the core of the round, and a diameter on ribs or ribs marked Φ c , as particularly illustrated in the figure 2a.

Selon le procédé de la présente invention, chaque rond à béton à liaisonner 1, 2 présente au moins une extrémité renforcée 4, 5, refoulée et filetée, tel que le diamètre à fond de filet d₂ soit égal ou supérieur à la section nominale Φ du rond. Ceci est particulièrement illustré aux figures 2d et 3.According to the method of the present invention, each concrete rod to be bonded 1, 2 has at least one reinforced end 4, 5, turned back and threaded, such that the diameter at the bottom of the thread d₂ is equal to or greater than the nominal section Φ of the round. This is particularly illustrated in Figures 2d and 3.

Plus précisément, selon le procédé, on effectue l'extrémité renforcée 4, 5, par double refoulement, un premier axial 7, permettant d'accroître le diamètre du rond à béton, et un second radial 8 lors du filetage par une technique de roulage.More precisely, according to the method, the reinforced end 4, 5 is carried out, by double delivery, a first axial 7, making it possible to increase the diameter of the concrete reinforcing bar, and a second radial 8 during threading by a rolling technique. .

Le premier refoulement axial 7 est réalisé préalablement au filetage, et on refoule à froid l'extrémité du rond à béton 1, 2, à liaisonner afin de réaliser une zone renforcée 7 correspondant au moins sensiblement au diamètre d₄ à flancs de filet.The first axial discharge 7 is carried out prior to threading, and the end of the concrete round bar 1, 2 is cold pressed, to be bonded in order to produce a reinforced zone 7 corresponding at least substantially at the diameter d₄ with thread flanks.

Ensuite, on pratique le second refoulement radial 8 en réalisant un filetage 9 sur la dite zone renforcée 7 par roulage afin que le diamètre à fond de filet d₂ soit égal ou supérieur à la section nominale Φ du rond.Then, the second radial discharge 8 is practiced by making a thread 9 on the said reinforced zone 7 by rolling so that the diameter at the bottom of the thread d₂ is equal to or greater than the nominal section Φ of the round.

Cela étant, d'une façon générale, les refoulements 7, 8 sont effectués sur la longueur du filetage 9 de la dite extrémité 4, 5.However, generally, the upsets 7, 8 are carried out along the length of the thread 9 of said end 4, 5.

Les différentes étapes du procédé sont illustrées aux figures 2a à 2d.The different stages of the process are illustrated in Figures 2a to 2d.

A la figure 2a, on montre un premier écroutage de l'extrémité du rond à renforcer pour le débarrasser de ses côtes ou nervures et pour donner à cette extrémité une cylindricité acceptable. Cet écroutage est repéré par le diamètre d₀ voisin ou tres légèrement inférieur du diamètre Φ.In FIG. 2a, a first peeling of the end of the round to be reinforced is shown to rid it of its ribs or ribs and to give this end an acceptable cylindricity. This peeling is identified by the diameter d₀ close to or very slightly less than the diameter Φ.

Sur cette extrémité 4 ainsi préparée, on procède au premier refoulement 7 à un taux d'accroissement du diamètre de l'extrémité voisin de 15 à 20 %. Cette étape porte le diamètre d₀ à un diamètre supérieur d₃, lui-même supérieur au diamètre Φ du rond. Ce refoulement à froid est réalisé en effectuant une poussée axiale sur l'extrémité selon la flèche 10.On this end 4 thus prepared, the first discharge 7 is carried out at a rate of increase in the diameter of the neighboring end from 15 to 20%. This step brings the diameter d₀ to a diameter greater than d₃, itself greater than the diameter Φ of the circle. This cold delivery is achieved by carrying out an axial push on the end according to arrow 10.

Ensuite, comme le montre la figure 2c, on dresse la portée refoulée 7, notamment pour la calibrer, au diamètre d₄ qui va permettre d'effectuer le filetage souhaité par roulage.Then, as shown in FIG. 2c, the driven surface 7 is drawn up, in particular to calibrate it, at the diameter d₄ which will make it possible to carry out the desired threading by rolling.

Selon la technique de roulage, ce diamètre d₄ correspond au diamètre à flancs de filet montre sur la figure 3. Pendant le roulage, on va ensuite repousser le métal pour constituer le fond de filet d₂ et le refouler pour constituer la partie extérieure du filetage d₁.According to the rolling technique, this diameter d₄ corresponds to the diameter with flanks of the thread shown in Figure 3. During rolling, we will then push the metal to form the bottom of thread d₂ and push it back to constitute the outer part of the thread d du .

Dans ces conditions, on parvient à l'extrémité telle que repérée à la figure 2d dans laquelle celle-ci, après un double refoulement axial 7 et radial 8, montre une extrémité renforcée telle que le diamètre à fond de filet d₂ soit égal ou supérieur à la section nominale Φ du rond.Under these conditions, one arrives at the end as indicated in FIG. 2d in which the latter, after a double axial delivery 7 and radial 8, shows a reinforced end such that the diameter at the bottom of the thread d₂ is equal or greater at nominal section Φ of the round.

Par ailleurs, pour résister au test de traction imposé par certaines normes de sécurité, l'extrémité 4 et/ou 5 du rond à béton 1 et/ou 2 renforcé par refoulement, est précontrainte.Furthermore, to withstand the tensile test imposed by certain safety standards, the end 4 and / or 5 of the concrete reinforcing bar 1 and / or 2 reinforced by discharge, is prestressed.

Cette précontrainte permet d'annuler tous les déplacements et allongements des ronds à béton et notamment de leurs extrémités lors de tests de sécurité mis en oeuvre. Elle est effectuée postérieurement au filetage, mécaniquement par compression de la dite extrémité filetée.This prestressing makes it possible to cancel all the displacements and elongations of the concrete reinforcing bars and in particular of their ends during the safety tests implemented. It is carried out after threading, mechanically by compression of said threaded end.

Le procédé qui vient d'être décrit permet la réalisation d'une liaison mécanique de deux ronds à béton bout à bout sensiblement coaxialement. Cependant, ce procédé peut être adapté pour obtenir une liaison mécanique d'un rond à béton à un point d'ancrage.The process which has just been described allows the realization of a mechanical connection of two concrete rods end to end substantially coaxially. However, this process can be adapted to obtain a mechanical connection of a concrete ring to an anchor point.

Dans ce cas, le manchon sera adapté à la réception d'un seul rond mais présentera une configuration extérieure en forme de douille d'ancrage.In this case, the sleeve will be suitable for receiving a single round but will have an external configuration in the form of an anchoring sleeve.

Cela étant, à titre d'exemple, dans le cas d'un rond à béton HA20 de section nominale 20 mm, on pratique sur son extrémité un filetage M24 de tolérance 6g.However, by way of example, in the case of an HA20 concrete reinforcing bar with a nominal section of 20 mm, an M24 thread of tolerance 6g is practiced on its end.

Après un écroutage de l'extrémité du rond, on a mené le refoulement axial pour obtenir un diamètre d₃ de 23 mm.After peeling off the end of the round, the axial discharge was carried out to obtain a diameter d₃ of 23 mm.

Ensuite, on a mené un cylindrage de l'extrémité ainsi refoulée pour ramener le diamètre d₄ compris entre 21,803 et 22,003 mm.Then, a rolling of the end thus driven was carried out in order to bring the diameter d₄ between 21,803 and 22,003 mm.

Sur cette extrémité calibrée, on a réalisé le filetage M24 au pas de 3 par roulage. Le diamètre extérieur d₁ étant alors compris entre 23,577 et 23,952 mm, et le diamètre à fond de filet d₂ correspondant alors à 20,704 mm soit supérieur au 20 mm de la section nominale du rond HA20.On this calibrated end, the M24 thread was produced in steps of 3 by rolling. The outside diameter d₁ then being between 23.577 and 23.952 mm, and the diameter at the bottom of the thread d₂ then corresponding to 20.704 mm is greater than 20 mm of the nominal section of the round HA20.

De même, en partant d'un rond à béton HA de 20 mm, pour obtenir un diamètre M24 au pas de deux, compte tenu de la normalisation des filetages, il faut partir d'un diamètre primitif égal au diamètre à flancs de filet situé entre 22,493 et 22,603 mm.Similarly, starting from a 20 mm HA concrete rod, to obtain a diameter M24 in steps of two, taking into account the standardization of the threads, it is necessary to start from a pitch diameter equal to the diameter with flanks located between 22.493 and 22.603 mm.

Par rapport à la solution antérieure dans laquelle on refoulait à froid en une seule étape l'extrémité du rond à béton puis on taillait le filetage, il est à noter un gain important car la masse refoulée nécessaire est beaucoup plus faible.Compared to the previous solution in which the cold end of the concrete ring was pushed back in a single step, then the thread was cut, it should be noted that there is a significant gain because the required pumped mass is much lower.

Antérieurement, il fallait obtenir un refoulement extérieur de l'ordre de 27 mm, soit un déplacement de masse de l'ordre de 50 g et une longueur de 20 mm.Previously, it was necessary to obtain an external delivery of the order of 27 mm, ie a mass displacement of the order of 50 g and a length of 20 mm.

Selon la présente invention, le refoulement axial nécessaire engendre un déplacement d'une masse de 18 g ou une longueur de 8 mm. Le refoulement axial est donc diminué de 50 à 18 g soit un rapport diminué de 2,8.According to the present invention, the necessary axial discharge generates a displacement of a mass of 18 g or a length of 8 mm. The axial discharge is therefore reduced from 50 to 18 g, ie a ratio reduced by 2.8.

Par ailleurs, la qualité du filetage permet d'abandonner la tolérance 8g et de mettre en oeuvre des tolérances 5 ou 6 g.In addition, the quality of the thread makes it possible to abandon the 8g tolerance and to implement 5 or 6 g tolerances.

La figure 4 montre schématiquement une installation de préparation de ronds à béton pour autoriser la mise en oeuvre du procédé de la présente invention.FIG. 4 schematically shows an installation for preparing concrete rods to authorize the implementation of the method of the present invention.

L'installation comporte tout d'abord une zone d'amenage du rond à béton à préparer. Dans cette zone est prévu un étau 10 qui va pouvoir serrer le rond à béton 1 et le déplacer vers l'installation.The installation firstly includes a zone for supplying the concrete reinforcing rod to be prepared. In this zone is provided a vice 10 which will be able to tighten the concrete rod 1 and move it towards the installation.

A la suite de cette zone, sont prévus des moyens 11 d'immobilisation du rond à préparer. Ces moyens sont par exemple constitués par un étau 11 de grande longueur, notamment garnis de revêtement type caoutchouc naturel ou polyuréthane pour éviter les blessures des ronds à béton.Following this zone, means 11 are provided for immobilizing the circle to be prepared. These means are for example constituted by a vice 11 of great length, in particular furnished with coating of the natural rubber or polyurethane type to avoid injuries to the concrete reinforcing bars.

L'avantage de présenter une grande longueur d'étau permet de disposer d'une surface importante et d'une relative faiblesse de compression au mètre carre.The advantage of having a large vice length makes it possible to have a large surface area and a relative weakness of compression per square meter.

Les étaux 10 et 11 sont du type hydraulique et déplaçable horizontalement par rapport à l'axe longitudinal 22 d'amenée des ronds à béton.The clamps 10 and 11 are of the hydraulic type and displaceable horizontally relative to the longitudinal axis 22 of supply of the concrete rods.

Les différentes flèches sur la figure 4 simulent le fonctionnement du système et notamment le fonctionnement suivant : l'étau 10 serre le rond à béton, l'étau d'immobilisation 11 s'ouvre, l'étau 10 se déplace vers l'avant, l'étau 11 se resserre sur le rond, l'étau 10 se libère et recule pour se préparer à un nouveau cycle.The different arrows in FIG. 4 simulate the operation of the system and in particular the following operation: the vice 10 clamps the concrete ring, the immobilization vice 11 opens, the vice 10 moves forward, the vice 11 tightens on the round, the vice 10 becomes free and moves back to prepare for a new cycle.

Devant l'étau d'immobilisation 11 seront prévus à coulissement, une cisaille 12, des moyens 13 pour refouler à froid axialement l'extrémité des ronds, ainsi qu'une unité de contrainte mécanique par compression de l'extrémité filetée du rond.In front of the immobilization vice 11 will be provided sliding, a shear 12, means 13 for cold pressing axially the end of the rounds, and a unit of mechanical stress by compression of the threaded end of the round.

Ceci sera notamment possible en prévoyant des glissières 15 devant l'étau afin d'autoriser un déplacement vertical des trois outils 12-14 comme le suggèrent les figures, pour être placés coaxialement dans l'axe 22 du rond bloqué en 11.This will be possible in particular by providing slides 15 in front of the vice in order to allow vertical movement of the three tools 12-14 as suggested in the figures, to be placed coaxially in the axis 22 of the circle locked at 11.

Dans ces conditions, on pourra travailler le rond à béton sans devoir modifier son positionnement, celui-ci étant bloqué une fois pour toute dans l'étau 11.Under these conditions, we can work the concrete reinforcing bar without having to change its positioning, it being locked once and for all in the vice 11.

De même, l'installation présentera des moyens 16, 17 pour écrouter la portée à refouler et/ou à fileter. Ces moyens seront prévus à déplacement vertical et horizontal pour pouvoir amener l'outil d'écroutage dans l'axe 22 longitudinal du rond à béton à travailler.Similarly, the installation will present means 16, 17 for listening to the scope to be driven back and / or to be threaded. These means will be provided for vertical and horizontal movement in order to be able to bring the peeling tool in the longitudinal axis 22 of the concrete rod to be worked.

Par ailleurs, l'installation comportera, dans le même esprit, des moyens 18 pour réaliser un filetage par roulage, c'est-à-dire que l'unité 18 sera apte à être déplacée pour être placée coaxialement dans l'axe 22 bloqué dans les moyens 11.Furthermore, the installation will include, in the same spirit, means 18 for carrying out a threading by rolling, that is to say that the unit 18 will be able to be moved to be placed coaxially in the axis 22 blocked in the means 11.

Enfin, l'installation présentera également une unité 19 de vissage et dévissage d'un manchon permettant la mise en oeuvre de la dite contrainte dans l'outil 14.Finally, the installation will also have a unit 19 for screwing and unscrewing a sleeve allowing the said constraint to be implemented in the tool 14.

Le principal avantage de l'installation de la présente invention réside dans le fait que toutes les opérations sont menées sans devoir déplacer le rond à béton ni le repositionner et évitent ainsi tous les positionnements et centrages qui seraient obligatoires pour mener les différentes étapes d'usinage.The main advantage of the installation of the present invention lies in the fact that all the operations are carried out without having to move the rebar or reposition it and thus avoid all the positioning and centering which would be compulsory for carrying out the various machining steps. .

Ainsi, on pourra réaliser sur le rond à béton, et plus précisément sur les extrémités un renforcement par double refoulement, un premier axial par les moyens 13 de refoulement à froid, et un second radial lors du filetage par l'outil de roulage 18. Cette façon de faire permet de diminuer les pressions de refoulement à froid, de faciliter le refoulement à froid en travaillant sur un diamètre usiné, d'éliminer la surface trempée, c'est-à-dire la peau du rond à béton, et ses nervures grâce à l'écroutage.Thus, a reinforcement by double discharge, a first axial by means of cold discharge means, and a second radial during threading by the rolling tool 18 can be produced on the concrete reinforcing rod, and more precisely on the ends. This procedure makes it possible to reduce the cold delivery pressures, to facilitate cold delivery by working on a machined diameter, to eliminate the hardened surface, that is to say the skin. of the concrete reinforcing bar, and its ribs thanks to the crimping.

Naturellement, d'autres mises en oeuvre de la présente, à la portée de l'homme de l'art, auraient pu être envisagées sans pour autant sortir du cadre de la présente demande.Naturally, other implementations of the present, within the reach of those skilled in the art, could have been envisaged without departing from the scope of the present application.

Claims (10)

Procédé de réalisation d'une liaison mécanique de ronds à béton, qui trouvera notamment son application dans le domaine de la construction en béton, par lequel on liaisonne au moins un rond à béton (1) à un autre rond à béton (2), ou à un point d'ancrage, par l'intermédiaire d'un manchon taraudé de liaison (3), le dit rond à béton (1) présentant une section nominale Φ, et au moins une extrémité (4) renforcée, refoulée et filetée, telle que le diamètre à fond de filet d₂ soit égal ou supérieur à la section nominale Φ du rond, caractérisé par le fait que l'on effectue l'extrémité renforcée (4) par double refoulement, un premier axial (7) permettant d'accroître le diamètre du rond à béton, un second radial (8) lors du filetage par une technique de roulage.Process for producing a mechanical connection of concrete rods, which will find its application in particular in the field of concrete construction, by which at least one concrete rod (1) is linked to another concrete rod (2), or at an anchor point, by means of a threaded connection sleeve (3), the said concrete rod (1) having a nominal section Φ, and at least one end (4) reinforced, turned back and threaded , such that the diameter at the bottom of the thread d₂ is equal to or greater than the nominal section Φ of the round, characterized in that the reinforced end (4) is effected by double discharge, a first axial (7) allowing d 'increase the diameter of the concrete ring, a second radial (8) when threading by a rolling technique. Procédé selon la revendication 1, caractérisé par le fait que : - préalablement au filetage, on refoule à froid l'extrémité (4) du rond à béton à liaisonner afin de réaliser une zone renforcée de diamètre correspondant au moins sensiblement au diamètre à flancs de filet d₄, - on réalise un filetage (9) sur la dite zone renforcée (7) par roulage afin que le diamètre à fond de filet d₂ soit égal ou supérieur à la dite section nominale Φ. Method according to claim 1, characterized in that: - prior to threading, the end (4) of the concrete rod to be bonded is cold-pressed in order to produce a reinforced zone of diameter corresponding at least substantially to the diameter with thread flanks d₄, - A thread (9) is produced on said reinforced zone (7) by rolling so that the diameter at the bottom of the thread d₂ is equal to or greater than said nominal section Φ. Procédé selon la revendication 1, caractérisé par le fait que les refoulements (7, 8) sont effectués sur la longueur de filetage de la dite extrémité (4).Method according to claim 1, characterized in that the displacements (7, 8) are carried out over the thread length of said end (4). Procédé selon la revendication 1, caractérisé par le fait qu'on réalise le premier refoulement (7) à un taux d'accroissement du diamètre de l'extrémité voisin de 15 %.Method according to claim 1, characterized in that the first delivery (7) is carried out at a rate of increase in the diameter of the neighboring end of 15%. Procédé selon la revendication 1, caractérisé par le fait que postérieurement au filetage de la dite extrémité refoulée, on contraint mécaniquement par compression la dite extrémité filetée.Method according to claim 1, characterized in that after the threading of the said pushed end, the said threaded end is mechanically constrained by compression. Procédé selon la revendication 2, caractérisé par le fait que : - on écroute l'extrémité du rond brut pour ôter les nervures extérieures, - on refoule à froid en réalisant une poussée axiale sur l'extrémité afin d'obtenir un diamètre voisin du diamètre à flancs de filet d₄, - on dresse la portée refoulée pour la calibrer et effectuer le filetage souhaité par roulage. Method according to claim 2, characterized in that: - we listen to the end of the raw circle to remove the outer ribs, - cold pressure is produced by carrying out an axial thrust on the end in order to obtain a diameter close to the diameter with thread flanks d₄, - we set up the driven surface to calibrate it and carry out the desired threading by rolling. Liaison mécanique d'un rond à béton à un point d'ancrage, obtenu par la mise en oeuvre du procédé selon l'une quelconque des revendications 1 a 6.Mechanical connection of a concrete ring to an anchor point, obtained by the implementation of the method according to any one of claims 1 to 6. Liaison mécanique de rond à béton bout à bout sensiblement coaxialement obtenu par la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6.Mechanical connection of concrete to butt end substantially coaxially obtained by the implementation of the method according to any one of claims 1 to 6. Rond à béton autorisant la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6, caractérisé par le fait qu'au moins une de ses extrémités (4) porte un double refoulement (7, 8) tel que le diamètre à fond de filet d₂ soit supérieur ou égal à la section nominale du rond à béton Φ.Concrete rod authorizing the implementation of the method according to any one of Claims 1 to 6, characterized in that at least one of its ends (4) carries a double discharge (7, 8) such that the diameter at thread bottom d₂ is greater than or equal to the nominal section of the concrete reinforcing bar Φ. Installation de préparation de ronds à béton pour autoriser la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6, caractérisée par le fait qu'elle présente : a) des moyens (11) d'immobilisation du rond (1) à préparer, b) des moyens (13) pour refouler à froid axialement l'extrémité (4) du rond à béton, c) des moyens (16, 17) pour écrouter la portée à refouler et/ou à fileter, d) des moyens (18) pour réaliser un filetage par roulage de la dite extrémité, les dits moyens b), c), d) étant déplaçables pour être placés coaxialement dans l'axe (22) du rond à béton bloqué dans les moyens d'immobilisation (11).Installation for preparing concrete reinforcing bars to authorize the implementation of the process according to any one of Claims 1 to 6, characterized in that it has: a) means (11) for immobilizing the circle (1) to be prepared, b) means (13) for axially cold-pressing the end (4) of the concrete ring, c) means (16, 17) for listening to the feed to be driven back and / or to be threaded, d) means (18) for making a thread by rolling said end, said means b), c), d) being movable to be placed coaxially in the axis (22) of the concrete block blocked in the immobilization means (11).
EP92440073A 1992-03-30 1992-06-09 Method of making mechanical barjoints, joint obtained by this method, bar making possible this method and installation for the preparation of the bars Expired - Lifetime EP0563490B1 (en)

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FR9204187A FR2689156B1 (en) 1992-03-30 1992-03-30 PROCESS FOR PRODUCING A MECHANICAL CONNECTION OF CONCRETE ROUND, CONNECTION OBTAINED BY THE PROCESS, CONCRETE ROUND AUTHORIZING THE IMPLEMENTATION OF SAID PROCESS, AND CONCRETE ROUND PREPARATION INSTALLATION.
FR9204187 1992-03-30

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EP0327770B1 (en) * 1988-02-03 1993-01-20 Etablissements A. Mure Method of making mechanical bar joints, bar joint making possible the method, and mechanical bar joint made by same
FR2653809A1 (en) 1989-10-26 1991-05-03 Techniport Sa Installation for producing concrete reinforcement bars
EP0448488A1 (en) * 1990-03-23 1991-09-25 Etablissements A. Mure Coupling for reinforcing bars, sleeve for use in said coupling, and method of forming such coupling

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0947642A3 (en) * 1998-03-31 2000-01-12 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
EP1048798A1 (en) * 1999-04-22 2000-11-02 Ancotech Ag Method for manufacturing externally threaded reinforcing bars
CN104707923A (en) * 2015-03-17 2015-06-17 丰都县雷龙金属构件有限公司 Novel reinforcing steel bar tightening connecting machine
US11414866B2 (en) * 2017-08-16 2022-08-16 Pfeifer Holding Gmbh & Co. Kg Tension member or compression member having corrosion-resistant thread flanks
WO2020183071A1 (en) * 2019-03-13 2020-09-17 Bartec Group Method for preparing a reinforcing rod for reinforced concrete
CN113543900A (en) * 2019-03-13 2021-10-22 巴特克集团 Method for producing a reinforcement for reinforced concrete

Also Published As

Publication number Publication date
GR3022596T3 (en) 1997-05-31
FR2689156A1 (en) 1993-10-01
ES2098477T3 (en) 1997-05-01
SG47933A1 (en) 1998-04-17
DK0563490T3 (en) 1997-06-02
FR2689156B1 (en) 1995-07-13
DE69215856T2 (en) 1997-06-05
ATE146247T1 (en) 1996-12-15
DE69215856D1 (en) 1997-01-23
EP0563490B1 (en) 1996-12-11
HK1007585A1 (en) 1999-04-16

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