EP0420973A1 - Process for the manufacture of a framework for reinforcing concrete structures and framework obtained. - Google Patents

Process for the manufacture of a framework for reinforcing concrete structures and framework obtained.

Info

Publication number
EP0420973A1
EP0420973A1 EP90907125A EP90907125A EP0420973A1 EP 0420973 A1 EP0420973 A1 EP 0420973A1 EP 90907125 A EP90907125 A EP 90907125A EP 90907125 A EP90907125 A EP 90907125A EP 0420973 A1 EP0420973 A1 EP 0420973A1
Authority
EP
European Patent Office
Prior art keywords
reinforcement
sheet
strip
mpa
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90907125A
Other languages
German (de)
French (fr)
Other versions
EP0420973B1 (en
Inventor
Georges Joseph Michel Guerin
Michel Temenides
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT90907125T priority Critical patent/ATE78310T1/en
Publication of EP0420973A1 publication Critical patent/EP0420973A1/en
Application granted granted Critical
Publication of EP0420973B1 publication Critical patent/EP0420973B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/005—Embossing sheets or rolls
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/16—Reinforcements
    • E01C11/18—Reinforcements for cement concrete pavings
    • 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

Definitions

  • the present invention relates to a method of manufacturing a reinforcement for the reinforcement of concrete structures and in particular of concrete slab or veil.
  • the present invention also relates to an armature obtained by this method.
  • FR A-2 579 651 discloses a reinforcing element which can be used for any continuous work of great length and in particular for concrete roads or pavements, which, while allowing rapid and easy continuous laying, also provides resistance. increased at transverse cracking for a reduced rate of binding iron.
  • This reinforcing element is in the form of a relatively narrow and thin tape, the main faces of which are embossed or notched.
  • the embossing is in the form of alternately projecting relief, delimiting bosses and, in hollow delimiting cells.
  • These bosses and cells can be in the form of cones or pyramids possibly truncated or of any other suitable shape such as cylindrical or parallelepiped.
  • the height of the bosses or cells relative to the adjacent surface is preferably from 5 to 807. approximately the thickness of the strip.
  • the strip is made of steel with high elastic limit, for example, having a tensile strength greater than 800 MPa and, preferably, has a thickness of 0.8 to 2.5 mm and a width of 10 to 60 mm.
  • FR-A-2 579 651 also describes a process for manufacturing an embossed or notched strip as defined above, a process which consists in passing a strip in the form of a flat strip between at least one pair of rollers the working faces respectively have recessed and projecting imprints corresponding to those which it is desired to appear on the strip.
  • said strip In order to give said strip the desired mechanical properties, it is subjected before embossing or notching a patenting treatment and, after embossing or notching, a treatment increasing the resistance to corrosion, such as pickling followed by phophatation.
  • the strip is made of steel with high elastic limit and, consequently, it is not galvanizable, which obliges for its protection against corrosion to make it undergo a phosphating treatment.
  • this steel is not weldable and therefore does not allow, for example, the manufacture of mesh.
  • the invention aims to remedy these drawbacks while retaining the advantages of a flat element for reinforcing a concrete structure.
  • the subject of the invention is a method of manufacturing a reinforcement for the reinforcement of concrete structures and in particular of concrete slab or veil, characterized in that a hot rolled sheet of thickness included is used as basic material. between 2.5 and 6 mm, in steel with a content of carbon less than 0.9% and an elastic limit of around 500 MPa, which is subjected to cold rolling at a rate of work hardening greater than 40% to obtain a sheet having on the one hand a thickness of between 0.8 and 2.5mm, and on the other hand an elastic limit greater than 700 MPa, the sheet being split to obtain a strip which is then embossed or notched continuously.
  • Steel with a low carbon content of less than 0.9% and having an elastic limit in the range 250-500 MPa can only be used in the reinforcement of concrete by excessively increasing the density of reinforcement. This is why, according to the invention, the steel of low carbon content and of elastic limit of the order of 500 MPa is subjected to cold rolling at a rate of work hardening greater than 40% in order to obtain the characteristics. mechanical necessary for its use, in acceptable density, in the reinforcement of concrete structures.
  • the use of low carbon steel makes it possible to obtain a weldable reinforcement for the production of complex structures.
  • the cold-rolled sheet is galvanized, which provides good protection against corrosion, in particular when the sheet is subjected to pitting or scratches. This protection is superior to a phosphating treatment.
  • the galvanized sheet is subjected to a restorative annealing at a temperature between 480oC and 520oC.
  • the restoration annealing is carried out under a controlled atmosphere of nitrogen and hydrogen.
  • the subject of the present invention is a reinforcement for reinforcing concrete structures, characterized in that it is obtained by the process mentioned above and in that it has at its ends a cutout allowing the insertion of a piece of liaison.
  • the cutout allows a mechanical connection with one end of another frame placed at the end, the connecting piece adjusting in the cutouts placed in superposition.
  • the cutout forms at least one cylindrical hole placed in the longitudinal axis of the frame, the connecting piece then being a rivet or a staple.
  • the cutout forms at least one notch, produced on the field of the frame, and into which can be inserted a connecting means formed for example of a steel strip folded in U.
  • the invention also relates to a concrete slab or veil, characterized in that the reinforcing elements consist of reinforcements according to the invention.
  • the subject of the invention is also a sub-layer of lean or severe concrete pavement stabilized by a hydraulic binder in which are inserted, for reinforcement, reinforcements according to the invention.
  • Fig. 1 represents a plan view of part of an armature according to the invention
  • Fig. 2 is a sectional view along line 2-2 of FIG. 1,
  • - Fig. 3 represents a particular example of connection between two ends of reinforcement
  • Fig. 4 represents another mode of connection between two reinforcements
  • FIG. 5 shows in perspective a slab reinforced with reinforcements according to the invention.
  • the method of manufacturing a reinforcement 1 as shown in Figs 1 and 2 for the reinforcement of concrete structures consists of the use of a base material consisting of a hot rolled sheet of 1.5 to 6 mm thickness of cladding steel and roofing whose elastic limit is less than 500 MPa.
  • a base material consisting of a hot rolled sheet of 1.5 to 6 mm thickness of cladding steel and roofing whose elastic limit is less than 500 MPa.
  • the sheet is cold rolled under a hardening rate greater than 40%. After cold rolling, the sheet is reduced to a thickness of between 0.8 and 2.5 mm.
  • such a sheet is a weldable sheet, furthermore the cold rolling treatment gives mechanical properties comparable to that of a so-called hard steel whose the elastic limit is between 600 and 800 MPa.
  • the cold-rolled sheet is galvanized.
  • the temperatures of the restoration annealing are between 480 and 520oC.
  • the duration of reprocessing under controlled atmosphere of N 2 and H 2 is approximately 30 seconds.
  • the corrosion protection of a galvanized steel is superior to a corrosion protection of a phosphated steel, particularly in the use of steel used in the construction of public works such as roads, such constructions undergoing between other the effects of alkaline products, widespread in winter for thawing.
  • the cold-rolled sheet, then galvanized, is split into strips so as to obtain strips of width between 10 and 60mm approximately.
  • the frame 1 according to the invention is produced by an embossing by stamping or by a notching of the strip so as to form protruding bosses on one side, corresponding to cells on another side. This shaping can be carried out cold.
  • the thickness of the base sheet before cold rolling is represented by the thin lines 2, and after stamping the strip 3 obtained by slitting said sheet into a strip, the frame 1 has projections 4 and corresponding recesses 5 of approximately 3mm in diameter distributed uniformly over its entire surface.
  • the projections 4 have the advantage of blocking by interlocking the phenomenon of unwinding by elasticity of the wound frames.
  • the frame 1 has at its ends a cutout allowing the insertion of a connecting piece.
  • the cutout forms at least one cylindrical hole 6 placed in the longitudinal axis of the frame 1, and the connecting piece is formed by a rivet 7.
  • the rivet 7 is placed between two reinforcing ends 1 so as to ensure continuity of the reinforcement, for example in a reinforced concrete slab and, for this purpose, the hole 6 is made in the two joined reinforcements for the passage of the body of the rivet 7.
  • notches 9 are cut on the field of said reinforcements 1. These notches can be rectangular or trapezoidal and their depth is substantially equal to the thickness of a connecting means 8.
  • the notches 9 are superimposed so as to insert the connecting means 8 which, in this embodiment, is formed by a steel strip folded in a U shape.
  • the connection is ensured by crushing the two lips of the U.
  • the frame 1 thus produced can be used in particular for the construction of concrete pavements as shown in FIG. 5.
  • the frame 1 is then embedded in the concrete
  • the reinforcement rate as a percentage of straight section of the road is preferably 0.15 to 0.5%, this rate to be understood as the ratio between the steel section and the concrete section, in a plane perpendicular to the longitudinal axis of the road .
  • the reinforcements 1 can also be spot welded. Thus it is possible to make welded mesh covering large areas.
  • Reinforcement 1 can also be used to reinforce lean concrete or gravel stabilized by a hydraulic binder for an underlayment of pavement, which allows the suppression of macro-cracking and primers of degradation.
  • reinforcements according to the invention which can be unwound in great lengths without harmful permanent deformation and linked or welded together makes it possible on the one hand to obtain continuous progress of the site, consequently with improved quality, and d on the other hand to greatly reduce the length of road occupied by the site, therefore to reduce in the same way the inconvenience brought to traffic in the case of a reinforcement or a renewal of an existing road or pavement, while ensuring corrosion protection, particularly effective against alkaline products spread on pavements in winter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Road Paving Structures (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Dans le procédé de fabrication d'une armature (1) pour le renforcement des structures en béton et notamment de dalle ou voile en béton se présentant sous la forme d'un feuillard (3) dont les faces sont crantées ou gaufrées, on utilise pour matériau de base une tôle laminée à chaud d'épaisseur comprise entre 1,5 et 6 mm, en acier possédant une teneur en carbone inférieure à 0,9 %, et une limite élastique d'environ 500 MPa, on soumet à un laminage à froid sous un taux d'écrouissage supérieur à 40 % pour obtenir une tôle ayant d'une part une épaisseur comprise entre 0,8 et 2,5 mm, et d'autre part une limite élastique supérieure à 700 MPa, la tôle étant refendue pour obtenir un feuillard (3) qui est ensuite cranté ou gaufré en continu. La demande concerne également l'armature obtenue selon ce procédé.In the method of manufacturing a reinforcement (1) for reinforcing concrete structures and in particular a concrete slab or wall in the form of a strip (3) whose faces are notched or embossed, it is used for base material a hot-rolled sheet with a thickness of between 1.5 and 6 mm, made of steel having a carbon content of less than 0.9%, and an elastic limit of about 500 MPa, is subjected to rolling at cold under a work hardening rate greater than 40% to obtain a sheet having on the one hand a thickness between 0.8 and 2.5 mm, and on the other hand an elastic limit greater than 700 MPa, the sheet being slit to obtain a strip (3) which is then continuously notched or embossed. The request also relates to the reinforcement obtained by this process.

Description

Procédé de fabrication d'une armature pour le renforcement des structures en béton et armature obtenue selon ce procédé.  Method of manufacturing a reinforcement for reinforcing concrete structures and reinforcement obtained according to this process.
La présente invention a pour objet un procédé de fabrication d'une armature pour le renforcement des structures en béton et notamment de dalle ou voile en béton. The present invention relates to a method of manufacturing a reinforcement for the reinforcement of concrete structures and in particular of concrete slab or veil.
La présente invention a également pour objet une armature obtenue selon ce procédé.  The present invention also relates to an armature obtained by this method.
On connaît dans le FR A-2 579 651, un élément de renforcement utilisable pour tout ouvrage continu de grande longueur et notamment pour les routes ou chaussées en béton, qui tout en permettant une pose en continu rapide et aisée assure par ailleurs, une résistance accrue à la fissuration transversale pour un taux de ferrai liage réduit.  FR A-2 579 651 discloses a reinforcing element which can be used for any continuous work of great length and in particular for concrete roads or pavements, which, while allowing rapid and easy continuous laying, also provides resistance. increased at transverse cracking for a reduced rate of binding iron.
Cet élément de renforcement se présente sous la forme d'un ruban relativement étroit et de faible épaisseure dont les faces principales sont gaufrées ou crantées.  This reinforcing element is in the form of a relatively narrow and thin tape, the main faces of which are embossed or notched.
Le gaufrage se présente sous la forme de relief alternativement en saillie, délimitant des bossages et, en creux délimitant des alvéoles. Ces bossages et alvéoles peuvent être en forme de cônes ou pyramides éventuellement tronqués ou de tout autre forme appropriée telle que cylindrique ou parallélêpipêdique. La hauteur des bossages ou alvéoles par rapport à la surface adjacente est de préférence de 5 à 807. environ de l'épaisseur du feuillard.  The embossing is in the form of alternately projecting relief, delimiting bosses and, in hollow delimiting cells. These bosses and cells can be in the form of cones or pyramids possibly truncated or of any other suitable shape such as cylindrical or parallelepiped. The height of the bosses or cells relative to the adjacent surface is preferably from 5 to 807. approximately the thickness of the strip.
Le feuillard est réalisé en acier à haute limite élastique, par exemple, ayant une résistance à la traction supérieure à 800 MPa et, a de préférence, une épaisseur de 0,8 à 2,5mm et une largueur de 10 à 60 mm.  The strip is made of steel with high elastic limit, for example, having a tensile strength greater than 800 MPa and, preferably, has a thickness of 0.8 to 2.5 mm and a width of 10 to 60 mm.
Par ailleurs, le gaufrage peut être obtenu par emboutissage ou crantage éventuellement à chaud. Le FR-A-2 579 651 décrit également un procédé de fabrication d'un feuillard gaufré ou cranté tel que défini précédemment, procédé qui consiste à faire passer un feuillard sous forme d'une bande plane entre au moins une paire de galets dont les faces de travail comportent respectivement des empreintes en creux et en saillie correspondant à celles que l'on désire faire apparaître sur le feuillard. Furthermore, the embossing can be obtained by stamping or possibly hot notching. FR-A-2 579 651 also describes a process for manufacturing an embossed or notched strip as defined above, a process which consists in passing a strip in the form of a flat strip between at least one pair of rollers the working faces respectively have recessed and projecting imprints corresponding to those which it is desired to appear on the strip.
Afin de conférer audit feuillard les propriétés mécaniques désirées, on lui fait subir avant gaufrage ou crantage un traitement de patentage et, après gaufrage ou crantage, un traitement accroissant la résistance à la corrosion, tel qu'un décapage suivi d'une phophatation.  In order to give said strip the desired mechanical properties, it is subjected before embossing or notching a patenting treatment and, after embossing or notching, a treatment increasing the resistance to corrosion, such as pickling followed by phophatation.
Un tel élément de renforcement et le procédé pour son élaboration comportent différents inconvénients.  Such a reinforcing element and the method for its preparation have various drawbacks.
En effet, le feuillard est réalisé en acier à haute limite élastique et, par conséquent, il n'est pas galvanisable, ce qui oblige pour sa protection contre la corrosion à lui faire subir un traitement de phosphatation.  Indeed, the strip is made of steel with high elastic limit and, consequently, it is not galvanizable, which obliges for its protection against corrosion to make it undergo a phosphating treatment.
De plus, cet acier n'est pas soudable et ne permet donc pas, par exemple, la fabrication de treillis.  In addition, this steel is not weldable and therefore does not allow, for example, the manufacture of mesh.
L'invention a pour but de remédier à ces inconvénients tout en conservant les avantages d'un élément plat de renforcement de structure en béton.  The invention aims to remedy these drawbacks while retaining the advantages of a flat element for reinforcing a concrete structure.
L'invention a pour objet un procédé de fabrication d'une armature pour le renforcement des structures en béton et notamment de dalle ou voile en béton, caractérisé en ce qu'on utilise pour matériau de base une tôle laminée à chaud d'épaisseur comprise entre 2,5 et 6 mm, en acier possédant une teneur en carbone inférieure à 0,9% et une limite élastique d'environ 500 MPa, que l'on soumet a un laminage à froid sous un taux d'écrouissage supérieur à 40% pour obtenir une tôle ayant d'une part une épaisseur comprise entre 0,8 et 2,5mm, et d'autre part une limite élastique supérieure à 700 MPa, la tόle étant refendue pour obtenir un feuillard qui est ensuite gaufré ou cranté en continu. The subject of the invention is a method of manufacturing a reinforcement for the reinforcement of concrete structures and in particular of concrete slab or veil, characterized in that a hot rolled sheet of thickness included is used as basic material. between 2.5 and 6 mm, in steel with a content of carbon less than 0.9% and an elastic limit of around 500 MPa, which is subjected to cold rolling at a rate of work hardening greater than 40% to obtain a sheet having on the one hand a thickness of between 0.8 and 2.5mm, and on the other hand an elastic limit greater than 700 MPa, the sheet being split to obtain a strip which is then embossed or notched continuously.
Un acier en faible teneur en carbone inférieur à 0,9% et possédant une limite élastique comprise dans l'intervalle 250-500 MPa ne peut être utilisé dans le renforcement d'un béton qu'en augmentant de façon excessive la densité de ferraillage. C'est pourquoi, selon l'invention, l'acier de faible teneur en carbone et de limite élastique de l ' ordre de 500 MPa est soumis à un laminage à froid sous un taux d'écrouissage supérieur à 40% pour obtenir les caractéristiques mécaniques nécessaires à son utilisation, en densité acceptable, dans le renforcement des structures en béton.  Steel with a low carbon content of less than 0.9% and having an elastic limit in the range 250-500 MPa can only be used in the reinforcement of concrete by excessively increasing the density of reinforcement. This is why, according to the invention, the steel of low carbon content and of elastic limit of the order of 500 MPa is subjected to cold rolling at a rate of work hardening greater than 40% in order to obtain the characteristics. mechanical necessary for its use, in acceptable density, in the reinforcement of concrete structures.
Selon l'invention, l'utilisation d'un acier de faible teneur en carbone permet d'obtenir une armature soudable pour la réalisation de structures complexes.  According to the invention, the use of low carbon steel makes it possible to obtain a weldable reinforcement for the production of complex structures.
En effet, dans l'utilisation d'armature en nappe, il est ainsi possible de souder bout à bout les armatures déroulées en parallêle.  Indeed, in the use of sheet reinforcement, it is thus possible to weld end to end reinforcement unwound in parallel.
Selon une caractéristique particulière de l'invention, la tôle laminée à froid est galvanisée, ce qui assure une bonne protection contre la corrosion, en particulier lorsque la töle est soumise à piqûres ou rayures. Cette protection est supérieure à un traitement de phosphatation.  According to a particular characteristic of the invention, the cold-rolled sheet is galvanized, which provides good protection against corrosion, in particular when the sheet is subjected to pitting or scratches. This protection is superior to a phosphating treatment.
Selon une autre caractéristiques particul¬ ère de l'invention, la tölé galvanisée est soumise à un recuit de restauration à une température comprise entre 480ºC et 520ºC. According to another particular characteristic era of the invention, the galvanized sheet is subjected to a restorative annealing at a temperature between 480ºC and 520ºC.
Selon encore une autre caractéristique particulière de l'invention, le recuit de restauration est effectué sous atmosphère contrôlée d'azote et d'hydrogêne.  According to yet another particular characteristic of the invention, the restoration annealing is carried out under a controlled atmosphere of nitrogen and hydrogen.
La présente invention a pour objet une armature de renforcement de structures en béton caractérisé en ce qu'elle est obtenue par le procédé mentionné ci-dessus et en ce qu'elle présente à ses extrémités une découpe permettant l'insertion d'une pièce de liaison.  The subject of the present invention is a reinforcement for reinforcing concrete structures, characterized in that it is obtained by the process mentioned above and in that it has at its ends a cutout allowing the insertion of a piece of liaison.
La découpe permet une liaison mécanique avec une extrémité d'une autre armature placée en bout, la pièce de liaison s'ajustant dans les découpes placées en superposition.  The cutout allows a mechanical connection with one end of another frame placed at the end, the connecting piece adjusting in the cutouts placed in superposition.
Selon une caractéristique particulière de l'invention, la découpe forme au moins un trou cylindrique placé dans l'axe longitudinal de l'armature, la pièce de liaison étant alors un rivet ou une agrafe.  According to a particular characteristic of the invention, the cutout forms at least one cylindrical hole placed in the longitudinal axis of the frame, the connecting piece then being a rivet or a staple.
Selon une autre caractéristique particulière de l'invention, la découpe forme au moins un cran, réalisé sur le champ de l'armature, et dans lequel peut s'insérer un moyen de liaison formé par exemple d'une bande d'acier pliée en U.  According to another particular characteristic of the invention, the cutout forms at least one notch, produced on the field of the frame, and into which can be inserted a connecting means formed for example of a steel strip folded in U.
L'invention a également pour objet une dalle ou un voile de béton, caractérisé en ce que les éléments de renforcement sont constitués par des armatures selon l'invention.  The invention also relates to a concrete slab or veil, characterized in that the reinforcing elements consist of reinforcements according to the invention.
L'invention a aussi pour objet une sous- couche de chaussée en béton maigre ou grave stabilisée par un liant hydraulique dans laquelle sont insérées, pour renforcement, des armatures selon l'invention.The subject of the invention is also a sub-layer of lean or severe concrete pavement stabilized by a hydraulic binder in which are inserted, for reinforcement, reinforcements according to the invention.
L'invention va être décrite plus en détail ci-dessous en se référant aux dessins annexés, donnés uniquement à titre d'exemple et sur lesquels : The invention will be described in more detail below with reference to the accompanying drawings, given solely by way of example and in which:
- La Fig. 1 représente une vue en plan d'une partie d'une armature selon l'invention,  - Fig. 1 represents a plan view of part of an armature according to the invention,
- La Fig. 2 est une vue en coupe selon la ligne 2-2 de la Fig. 1,  - Fig. 2 is a sectional view along line 2-2 of FIG. 1,
- La Fig. 3 représente un exemple particulier de liaison entre deux extrémités d'armature,  - Fig. 3 represents a particular example of connection between two ends of reinforcement,
- La Fig. 4 représente un autre mode de liaison entre deux armatures,  - Fig. 4 represents another mode of connection between two reinforcements,
- La Fig. 5 représente en perspective une dalle renforcée par des armatures selon l'invention.  - Fig. 5 shows in perspective a slab reinforced with reinforcements according to the invention.
Le procédé de fabrication d'une armature 1 tel que représenté aux Figs 1 et 2 pour le renforcement des structures en béton consiste en l'utilisation d'un matériau de base constituée d'une tôle laminée à chaud de 1,5 à 6 mm d'épaisseur en acier de bardage et couverture dont la limite élastique est inférieure à 500 MPa. Afin d'obtenir un matériau ayant une limite élastique supérieure à 700 MPa, la tôle est laminée à froid sous un taux d'écrouissage supérieur à 40%. Après laminage à froid, la töle est réduite à une épaisseur comprise entre 0,8 et 2, 5mm.  The method of manufacturing a reinforcement 1 as shown in Figs 1 and 2 for the reinforcement of concrete structures consists of the use of a base material consisting of a hot rolled sheet of 1.5 to 6 mm thickness of cladding steel and roofing whose elastic limit is less than 500 MPa. In order to obtain a material having an elastic limit greater than 700 MPa, the sheet is cold rolled under a hardening rate greater than 40%. After cold rolling, the sheet is reduced to a thickness of between 0.8 and 2.5 mm.
Un telle tôle, par les propriétés du matériau de base, est une tôle soudable, de plus le tra i tement de lam i nage à f ro i d lu i donne d es propr i étés mécaniques comparables à celle d'un acier dit dur dont la limite élastique est comprise entre 600 et 800MPa .  By virtue of the properties of the base material, such a sheet is a weldable sheet, furthermore the cold rolling treatment gives mechanical properties comparable to that of a so-called hard steel whose the elastic limit is between 600 and 800 MPa.
Afin d'assurer une protection contre la corrosion, la tôle laminée à froid est galvanisée.  To protect against corrosion, the cold-rolled sheet is galvanized.
Sur la ligne de galvanisation est effectué un recuit pour obtenir une restauration de l'acier laminé, sans provoquer une recristallisation et en conservant un niveau de résistance et de dureté peu modifié par rapport à l'acier laminé avant recuit. On the galvanizing line is carried out annealing in order to obtain a restoration of the rolled steel, without causing recrystallization and while retaining a level of resistance and hardness that is little modified compared to the rolled steel before annealing.
Les températures du recuit de restauration sont comprises entre 480 et 520ºC. La durée du retraitement sous atmosphère contrôlée d'N2 et H2 est d'environ 30 secondes. The temperatures of the restoration annealing are between 480 and 520ºC. The duration of reprocessing under controlled atmosphere of N 2 and H 2 is approximately 30 seconds.
La protection à la corrosion d'un acier galvanisé est supérieure a une protection a la corrosion d'un acier phosphaté, particulièrement dans l'utilisation d'acier entrant dans la construction de travaux publics comme par exemple les routes, de telles constructions subissant entre autre les effets des produits alcalins, répandus en hiver pour le dégel.  The corrosion protection of a galvanized steel is superior to a corrosion protection of a phosphated steel, particularly in the use of steel used in the construction of public works such as roads, such constructions undergoing between other the effects of alkaline products, widespread in winter for thawing.
La tôle laminée à froid, puis galvanisée, est refendue en bande de façon à obtenir des feuillards d'une largueur comprise entre 10 et 60mm environ.  The cold-rolled sheet, then galvanized, is split into strips so as to obtain strips of width between 10 and 60mm approximately.
L'armature 1 selon l'invention est réalisée par un gaufrage par emboutissage ou par un crantage du feuillard de façon à former des bossages en saillie sur une face, correspondant à des alvéoles sur une autre face. Cette mise en forme peut être réalisée à froid.  The frame 1 according to the invention is produced by an embossing by stamping or by a notching of the strip so as to form protruding bosses on one side, corresponding to cells on another side. This shaping can be carried out cold.
Comme représenté sur les Figs 1 et 2, l'épaisseur de la tôle de base avant laminage à froid est représentée par les traits fins 2, et après emboutissage du feuillard 3 obtenu par refendage en bande de ladite tôle, l'armature 1 présente des saillies 4 et des creux 5 correspondant d'environ 3mm de diamètre répartis uniformément sur toute sa surface. Les saillies 4 ont l'avantage de bloquer par emboitement le phénomène de déroulement par élasticité des armatures bobinées. l'armature 1 comporte à ses extrémités une découpe permettant l'insertion d'une pièce de liaison. As shown in FIGS. 1 and 2, the thickness of the base sheet before cold rolling is represented by the thin lines 2, and after stamping the strip 3 obtained by slitting said sheet into a strip, the frame 1 has projections 4 and corresponding recesses 5 of approximately 3mm in diameter distributed uniformly over its entire surface. The projections 4 have the advantage of blocking by interlocking the phenomenon of unwinding by elasticity of the wound frames. the frame 1 has at its ends a cutout allowing the insertion of a connecting piece.
Selon un premier mode de réalisation représenté à la Fig.3, la découpe forme au moins un trou cylindrique 6 placé dans l'axe longitudinal de l'armature 1, et la pièce de liaision est formée par un rivet 7.  According to a first embodiment shown in FIG. 3, the cutout forms at least one cylindrical hole 6 placed in the longitudinal axis of the frame 1, and the connecting piece is formed by a rivet 7.
Le rivet 7 est placé entre deux extrémités d'armature 1 de façon à assurer une continuité du ferraillage par exemple dans une dalle en béton armé et, à cet effet, le trou 6 est réalisé dans les deux armatures jointes pour le passage du corps du rivet 7.  The rivet 7 is placed between two reinforcing ends 1 so as to ensure continuity of the reinforcement, for example in a reinforced concrete slab and, for this purpose, the hole 6 is made in the two joined reinforcements for the passage of the body of the rivet 7.
Selon un autre exemple de liaison entre deux armatures 1 représenté à la Fig. 4, des crans 9 sont découpés sur le champ desdites armatures 1. Ces crans peuvent être rectangulaires ou trapézoïdaux et leur profondeur est sensiblement égale à l'épaisseur d'un moyen de liaison 8.  According to another example of connection between two armatures 1 shown in FIG. 4, notches 9 are cut on the field of said reinforcements 1. These notches can be rectangular or trapezoidal and their depth is substantially equal to the thickness of a connecting means 8.
Les crans 9 sont superposés de façon à insérer le moyen de liaison 8 qui, dans cet exemple de réalisation, est formé par une bande d'acier pliée en forme de U. La liaison est assurée par écrasement des deux lèvres du U.  The notches 9 are superimposed so as to insert the connecting means 8 which, in this embodiment, is formed by a steel strip folded in a U shape. The connection is ensured by crushing the two lips of the U.
L'armature 1 ainsi réalisée peut être utilisée notamment pour la construction de chaussées en béton comme représenté à la Fig. 5.  The frame 1 thus produced can be used in particular for the construction of concrete pavements as shown in FIG. 5.
L'armature 1 est alors noyée dans le béton The frame 1 is then embedded in the concrete
10 parallèlement à l'axe longitudinal de la chaussée en une ou plusieurs nappes parallèles à la surface de cette dernière. 10 parallel to the longitudinal axis of the carriageway in one or more plies parallel to the surface of the latter.
Le taux de ferraillage en pourcentage de section droite de la route est de préférence de 0,15 à 0,5%, ce taux devant être compris comme le rapport entre la section d'acier et la section de béton, dans un plan perpendiculaire à l'axe longitudinal de la route. The reinforcement rate as a percentage of straight section of the road is preferably 0.15 to 0.5%, this rate to be understood as the ratio between the steel section and the concrete section, in a plane perpendicular to the longitudinal axis of the road .
Les armatures 1 peuvent également être soudées par point. Ainsi il est possible de réaliser des treillis soudés couvrant de grandes surfaces.  The reinforcements 1 can also be spot welded. Thus it is possible to make welded mesh covering large areas.
L'armature 1 peut être également utilisée pour renforcer un béton maigre ou une grave stabilisée par un liant hydraulique pour une sous-couche de chaussée, ce qui permet la suppression de la macro-fissuration et des amorces de dégradation.  Reinforcement 1 can also be used to reinforce lean concrete or gravel stabilized by a hydraulic binder for an underlayment of pavement, which allows the suppression of macro-cracking and primers of degradation.
L'utilisation d'armatures selon l'invention pouvant être déroulées en grandes longueurs sans déformation permanente nuisible et liées ou soudées entre elles permet d'une part d'obtenir un avancement du chantier en continu, par conséquent avec une qualité améliorée, et d'autre part de réduire fortement la longueur de route occupée par le chantier, donc de réduire de la même manière la gêne apportée au traffic dans le cas d'un renforcement ou d'un renouveLement d'une route ou chaussée existant, tout en assurant une protection contre la corrosion, efficace tout particulièrement contre les produits alcalins répandus sur les chaussées en hiver.  The use of reinforcements according to the invention which can be unwound in great lengths without harmful permanent deformation and linked or welded together makes it possible on the one hand to obtain continuous progress of the site, consequently with improved quality, and d on the other hand to greatly reduce the length of road occupied by the site, therefore to reduce in the same way the inconvenience brought to traffic in the case of a reinforcement or a renewal of an existing road or pavement, while ensuring corrosion protection, particularly effective against alkaline products spread on pavements in winter.

Claims

REVENDICATIONS
1. Procédé de fabrication d'une armature pour le renforcement des structures en béton et notamment de dalle ou voile en béton, se présentant sous la forme d'un feuillard dont les faces sont crantées ou gaufrées, caractérisé en ce qu'on utilise pour matériau de base une tôle laminée à chaud d'épaisseur comprise entre 1,5 et 6mm, en acier possédant une teneur en carbone inférieure à 0,9%, et une limite élastique d'environ 500 MPa, que l'on soumet à un laminage à froid sous un taux d'écrouissage supérieur a 40% pour obtenir une tôle ayant d'une part une épaisseur comprise entre 0,8 et 2,5 mm, et d'autre part une limite élastique supérieure à 700 MPa, la tôle étant refendue pour obtenir un feuillard (3) qui est ensuite cranté ou gaufré en continu.  1. Method of manufacturing a reinforcement for the reinforcement of concrete structures and in particular of concrete slab or veil, being in the form of a strip whose faces are notched or embossed, characterized in that one uses for base material a hot-rolled sheet of thickness between 1.5 and 6mm, made of steel having a carbon content of less than 0.9%, and an elastic limit of approximately 500 MPa, which is subjected to a cold rolling at a work hardening rate greater than 40% to obtain a sheet having on the one hand a thickness between 0.8 and 2.5 mm, and on the other hand an elastic limit greater than 700 MPa, the sheet being split to obtain a strip (3) which is then notched or embossed continuously.
2. Procédé selon la revendication 1, caractérisé en ce que la tôle laminée à froid est galvanisée.  2. Method according to claim 1, characterized in that the cold-rolled sheet is galvanized.
3. Procédé selon les revendications 1 et 2, caractérisé en ce que la tôle galvanisée est soumise à un recuit de restauration à une température comprise entre 480ºC et 520ºC.  3. Method according to claims 1 and 2, characterized in that the galvanized sheet is subjected to a restoration annealing at a temperature between 480ºC and 520ºC.
4. Procédé selon la revendication 3, caractêrisé en ce que le recuit de restauration est effectué sous atmosphère contrôlée d'azote et d'hydrogène.  4. Method according to claim 3, characterized in that the restoration annealing is carried out under a controlled atmosphere of nitrogen and hydrogen.
5. Armature caractérisée en ce qu'elle est obtenue par le procédé selon les revendications 1 à 4 et en ce qu'elle présente, à ses extrémités une découpe (6, 9) permettant l'insertion d'une pièce de liaison (7, 8).  5. Reinforcement characterized in that it is obtained by the method according to claims 1 to 4 and in that it has, at its ends a cutout (6, 9) allowing the insertion of a connecting piece (7 , 8).
6. Armature selon la revendication 5, caractérisée en ce que la découpe forme au moins un trou cylindrique (6) placé dans l ' axe longitudinal de l'armature (1). 6. Reinforcement according to claim 5, characterized in that the cutout forms at least one cylindrical hole (6) placed in the longitudinal axis of the frame (1).
7. Armature selon la revendication 5, caractérisée en ce que la découpe forme au moins un cran (9), réalisé sur le champ de l'armature.  7. Armature according to claim 5, characterized in that the cutout forms at least one notch (9), produced on the field of the armature.
8. Dalle ou voile en béton, caractérisé en ce qu'il contient pour son renforcement des armatures (1) telles que définies dans les revendications 5 à 7.  8. Concrete slab or veil, characterized in that it contains, for its reinforcement, reinforcements (1) as defined in claims 5 to 7.
9. Sous couche de chaussée en béton maigre ou grave stabilisée par un liant hydraulique, caractérisée en ce qu'elle contient pour son renforcement des armatures (1) telles que définies dans les revendications 5 à 7.  9. Underlayment of roadway in lean or severe concrete stabilized by a hydraulic binder, characterized in that it contains, for its reinforcement, reinforcements (1) as defined in claims 5 to 7.
EP90907125A 1989-04-10 1990-04-10 Process for the manufacture of a framework for reinforcing concrete structures and framework obtained Expired - Lifetime EP0420973B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90907125T ATE78310T1 (en) 1989-04-10 1990-04-10 METHOD OF PRODUCTION OF REINFORCEMENT FOR REINFORCING CONCRETE STRUCTURES AND REINFORCEMENT OBTAINED BY THIS METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904679 1989-04-10
FR8904679A FR2645562B1 (en) 1989-04-10 1989-04-10 METHOD FOR MANUFACTURING A REINFORCEMENT FOR REINFORCING CONCRETE STRUCTURES AND REINFORCEMENT OBTAINED ACCORDING TO THIS PROCESS

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EP0420973A1 true EP0420973A1 (en) 1991-04-10
EP0420973B1 EP0420973B1 (en) 1992-07-15

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US (1) US5154534A (en)
EP (1) EP0420973B1 (en)
JP (1) JP2704042B2 (en)
CA (1) CA2029905A1 (en)
ES (1) ES2034860T3 (en)
FR (1) FR2645562B1 (en)
WO (1) WO1990012175A1 (en)
ZA (1) ZA902755B (en)

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Also Published As

Publication number Publication date
ZA902755B (en) 1991-11-27
JPH03505358A (en) 1991-11-21
US5154534A (en) 1992-10-13
JP2704042B2 (en) 1998-01-26
EP0420973B1 (en) 1992-07-15
ES2034860T3 (en) 1993-04-01
CA2029905A1 (en) 1990-10-11
WO1990012175A1 (en) 1990-10-18
FR2645562B1 (en) 1992-11-27
FR2645562A1 (en) 1990-10-12

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