FR2594871A1 - Method making it possible to reinforce structures or structural elements, particularly made of concrete, reinforced concrete or prestressed concrete by means of flexible reinforcement elements, device for installing the reinforcement elements, and reinforcement elements employed in the said method - Google Patents
Method making it possible to reinforce structures or structural elements, particularly made of concrete, reinforced concrete or prestressed concrete by means of flexible reinforcement elements, device for installing the reinforcement elements, and reinforcement elements employed in the said method Download PDFInfo
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- FR2594871A1 FR2594871A1 FR8602562A FR8602562A FR2594871A1 FR 2594871 A1 FR2594871 A1 FR 2594871A1 FR 8602562 A FR8602562 A FR 8602562A FR 8602562 A FR8602562 A FR 8602562A FR 2594871 A1 FR2594871 A1 FR 2594871A1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0255—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
Procédé permettant de renforcer des structures ou éléments de structure, notamment en béton, béton armé, béton précontraint a l'aide d'armatures souples, dispcsitif de mise en place des armatures, et armatures mises en osuvre dans ledit procédé. Method for reinforcing structures or structural elements, in particular in concrete, reinforced concrete, prestressed concrete using flexible reinforcements, device for placing reinforcements, and reinforcements used in said process.
La présente invention a trait à un procédé permettant de renforcer des structures ou éléments de structure, notamment en béton, béton armé, béton précontraint. The present invention relates to a method for reinforcing structures or structural elements, in particular concrete, reinforced concrete, prestressed concrete.
Elle concerne également de nouvelles armatures souples, plus particulièrement destinées a renforcer par ltexté- rieur des structures ou éléments de structure, notamment en beton, béton armé, béton précontraint, ainsi qu'un dispositif pour la mise en place de ces armatures. It also relates to new flexible reinforcements, more particularly intended for reinforcing structures or structural elements through the interior, in particular of concrete, reinforced concrete, prestressed concrete, as well as a device for the installation of these reinforcements.
On sait que les pièces en béton présentent une résistance à la traction très inférieure à leur résistance de compression, ce qui limite sensiblement leur capacité de résistance aux efforts de traction, de flexion et de cisaillement. We know that concrete parts have a tensile strength much lower than their compressive strength, which significantly limits their ability to withstand tensile, bending and shear forces.
On pallie ces insuffisances, soit en incorporant dans la masse de béton des armatures métalliques, soit en réalisant par des fils métalliques tendus une précontrainte. These shortcomings are remedied, either by incorporating metal reinforcements into the concrete mass, or by carrying out prestressed metal wires.
Il a été également proposé de renforcer les structures en béton par des tôles collées sur les parois de la structure à renforcer. It has also been proposed to reinforce the concrete structures with sheets glued to the walls of the structure to be reinforced.
Il s'agit toujours d'armatures métalliques qui présentent l'inconvénient de se corroder et d'être mal adaptées aux formes courbes ou complexes. They are always metallic reinforcements which have the drawback of corroding and of being ill-suited to curved or complex shapes.
La présente invention vise a remédier aux inconvénients précités, en proposant une nouvelle armature souple destinée à venir s'appliquer sur les parois externes de la structure à renforcer, réalisée à partir de -fibres naturelles ou synthétiques à module d'élasticité élevé et haute résistance a la traction. The present invention aims to remedy the aforementioned drawbacks, by proposing a new flexible reinforcement intended to be applied to the external walls of the structure to be reinforced, produced from natural or synthetic fibers with a high elasticity modulus and high resistance. has traction.
Dans son aspect le plus général, la présente invention concerne un procédé permettant de renforcer des structures ou éléments de structure, notamment en béton, béton armé, béton précontraint. In its most general aspect, the present invention relates to a method for reinforcing structures or structural elements, in particular concrete, reinforced concrete, prestressed concrete.
Le procédé conforme a l'invention est caractérisé en ce qu'il consiste - a partir d'une bande de fibres naturelles ou synthétiques a module d'élasticité élevé et haute résistance a la traction, a structure unidirectionnelle, la bande étant coupée a la longueur désirée - a imprégner cette bande d'une substance adaptée ala structure et aux fibres et destinée a assurer la fixation de la bande sur la structure å renforcer
de preference - à soumettre/ladite bande à une post-contrainte - à la mettre en place sur la paroi de la structure a renforcer, et - a la maintenir appliquée contre la paroi pendant la phase de fixation.The process according to the invention is characterized in that it consists - from a strip of natural or synthetic fibers with high elastic modulus and high tensile strength, with a unidirectional structure, the strip being cut at the desired length - to impregnate this strip with a substance adapted to the structure and to the fibers and intended to ensure the fixing of the strip to the structure to be reinforced
preferably - to subject / said strip to a post-stress - to place it on the wall of the structure to be reinforced, and - to keep it applied against the wall during the fixing phase.
Parmi les fibres naturelles ou synthétiques a module d'élasticité élevé et haute résistance a la traction qui conviennent pour la réalisation de l'armature, on peut citer les fibres de bore, de carbone, de verre, de polyester, de polyamide. Among the natural or synthetic fibers with a high modulus of elasticity and high tensile strength which are suitable for producing the reinforcement, mention may be made of boron, carbon, glass, polyester and polyamide fibers.
Les bandes de renforcement sont constituées par l'une des fibres du type précité ou par un mélange de deux ou de plusieurs de ces fibres, tel que carbone/polyamide ou verre/polyamide ou encore verre/carbone/polyamide. The reinforcing strips are formed by one of the fibers of the aforementioned type or by a mixture of two or more of these fibers, such as carbon / polyamide or glass / polyamide or else glass / carbon / polyamide.
Les bandes, que l'on coupe a la longueur désirée, sont enduites d'une résine thermodurcissable telle qu'une résine époxyde ou polyuréthannea laquelle on a éventuellement ajouté un durcisseur. de preference
de preference
Les bandes ainsi enduites sont/soumises a une postcontrainte, afin d'accroître leur résistance aux efforts.The strips, which are cut to the desired length, are coated with a thermosetting resin such as an epoxy or polyurethane resin to which a hardener has optionally been added. preferably
preferably
The strips thus coated are / subjected to post-stressing, in order to increase their resistance to stresses.
Ces renforts ont une épaisseur généralement comprise entre 0,5 et 5 mm et qui est fonction des contraintes auxquelles ils seront soumis ainsi que de la nature et des diamètres des fibres qui les constituent. These reinforcements have a thickness generally between 0.5 and 5 mm and which is a function of the stresses to which they will be subjected as well as the nature and the diameters of the fibers which constitute them.
Les armatures conformes à l'invention se caractérisent par une excellente résistance mécanique et par une grande souplesse, cette dernière propriété leur permettant d'épouser les formes les plus variées des supports qu'elles sont appelées a renforcer. The reinforcements in accordance with the invention are characterized by excellent mechanical resistance and by great flexibility, this latter property allowing them to match the most varied forms of the supports which they are called upon to reinforce.
Les armatures sont mises en place sur les parois externes de la structure a renforcer et maintenues appliquées contre la paroi pendant toute la phase de collage. Celui-ci est avantageusement réalisé en chauffant à une température généralement comprise entre llO"C et 1200C, ce qui permet d'ac célérer la polymérisation de la résine. The reinforcements are placed on the external walls of the structure to be reinforced and kept applied against the wall during the entire bonding phase. This is advantageously carried out by heating to a temperature generally between 110 ° C. and 1200 ° C., which makes it possible to accelerate the polymerization of the resin.
Le dispositif qui permet la mise en place des armatures, comporte avantageusement - un élément de recouvrement tel qu'un film étanche réalisé en une matière qui n'adhère pas a la bande de renforcement, et qui recouvre totalement cette dernière, ledit élément étant fixé par ses bords à la structure a consolider, par exemple a l'aide d'une bande adhésive - des moyens permettant de réaliser un vide partiel dans l'espace compris entre le film étanche et la structure a renforcer, tels qu'une tubulure traversant le film étanche et reliee à une pompe a vide , et - un élément chauffant tel qu'un ruban chauffant dans lequel sont incluses des résistances électriques et qui recouvre le film étanche. The device which allows the reinforcement to be put in place advantageously comprises - a covering element such as a waterproof film made of a material which does not adhere to the reinforcing strip, and which completely covers the latter, said element being fixed by its edges to the structure to be consolidated, for example using an adhesive strip - means making it possible to achieve a partial vacuum in the space between the waterproof film and the structure to be reinforced, such as through tubing the waterproof film and connected to a vacuum pump, and - a heating element such as a heating tape in which electrical resistors are included and which covers the waterproof film.
D'autres avantages et particularités de l'invention apparaîtront à la lecture du complément de description qui suit, donné à titre non limitatif et se référant aux dessins ci-annexés. Other advantages and features of the invention will appear on reading the additional description which follows, given without limitation and with reference to the accompanying drawings.
La figure 1 illustre de façon schématique la mise en place d'une bande de renforcement sur une structure en béton. Figure 1 schematically illustrates the establishment of a reinforcing strip on a concrete structure.
La figure 2 représente une pièce de forme courbe sur laquelle a été appliquée une bande de renforcement conforme a l'invention. FIG. 2 represents a part of curved shape to which a reinforcing strip has been applied in accordance with the invention.
Les figures 3 à 5 illustrent quelques exemples d'application du procédé conforme a l'invention. Figures 3 to 5 illustrate some examples of application of the method according to the invention.
La figure 6 représente une vue de dessus d'un dispositif permettant la mise en post-contrainte de la bande de renforcement. Figure 6 shows a top view of a device for post-stressing the reinforcing strip.
La figure 7 représente une vue en coupe suivant la ligne VII-VII de la figure 6. FIG. 7 represents a sectional view along line VII-VII of FIG. 6.
Comme te montre la figure 1 , on a appliqué sur une structure/en béton 5 à renforcer, une bande de renforcement 1 conforme a l'invention, constituée par des fibres naturelles ou synthétiques unidirectionnelles 2 qui sont maintenues, a la fabrication, par des fils de trame 3 enrobés d'une résine thermodurcissable 4, telle qu'une résine époxyde. As shown in FIG. 1, a reinforcing strip 1 according to the invention has been applied to a structure / concrete 5 to be reinforced, consisting of unidirectional natural or synthetic fibers 2 which are maintained, during manufacture, by weft yarns 3 coated with a thermosetting resin 4, such as an epoxy resin.
La bande 1 est maintenue appliquée sur la structure en béton 5 par un film étanche 6 n'adhérant pas å la résine thermodurcissable et qui peut être, par exemple, un film en polyéthyléne ou polypropylène. Ce film recouvre totalement la bande de renforcement 1 et est fixé sur le support par un adhésif 7. Le film est traversé par une tubulure 10 qui est reliée a une pope a vide et qui permet de faire un vide partiel dans l'espace compris entre le film 6 et le support 5. La pression constante qui s'exerce sur le support et qui est approximativement de l'ordre de 0,5 bar a pour effet de maintenir la bande 1 rigoureusement appliquée sur le support 5, ce qui permet d'obtenir un collage efficace et régulier.Le film 6 est lui-même recouvert d'un ruban chauffant 8 dans lequel sont incluses des résistances électriques 9. The strip 1 is kept applied to the concrete structure 5 by a waterproof film 6 which does not adhere to the thermosetting resin and which can be, for example, a film of polyethylene or polypropylene. This film completely covers the reinforcement strip 1 and is fixed to the support by an adhesive 7. The film is traversed by a tube 10 which is connected to a vacuum pop and which makes it possible to create a partial vacuum in the space between the film 6 and the support 5. The constant pressure exerted on the support and which is approximately of the order of 0.5 bar has the effect of keeping the strip 1 rigorously applied to the support 5, which allows d '' obtain an efficient and regular bonding. The film 6 is itself covered with a heating tape 8 in which are included electrical resistors 9.
On note que la résine thermodurcissable qui enrobe les fibres, remplit une triple fonction : elle assure, bien entendu, tout d'abord, la fixation de la bande de renforcement sur la structure en beton, elle protège ladite bande et elle répartit et transmet les efforts de la structure en béton à la bande de renforcement. On comprend toute l' mportance que revêt la réalisation d'un collage uniforme, si l'on veut que la résine puisse correctement remplir ces fonctions. It is noted that the thermosetting resin which coats the fibers, fulfills a triple function: it ensures, of course, first of all, the fixing of the reinforcing strip on the concrete structure, it protects said strip and it distributes and transmits forces from the concrete structure to the reinforcing strip. We understand the importance of achieving uniform bonding, if we want the resin to properly perform these functions.
Pour la mise en place de l'armature, on procède de la manière qui suit. For the installation of the frame, we proceed as follows.
La bande est coupée a la longueur voulue et enduite jusqu'a saturation d'une résine thermodurcissable telle qu'une résine époxyde a laquelle a été éventuellement ajouté un catalyseur pour en accélérer la polymérisation. La bande ainsi enduite est soumise a une post-contrainte, calculée en fonction des contraintes auxquelles la bande sera soumise, puis elle est appliquée sur la structure a renforcer 5. On la recouvre alors par le film étanche 6 que l'on fixe sur la structure par la bande adhésive 7, et l'on réalise un vide partiel dans l'espace compris entre le film 6 et la structure 5.On applique sur le film 6 la nappe chauffante 8 et l'on chauffe a une température généralement comprise entre llO"C et 1200C. La polymérisation et donc le durcissement de la résine sont obtenus au bout d'1/2 heure a 1 heure suivant la nature de la résine utilisée. The strip is cut to the desired length and coated until saturation with a thermosetting resin such as an epoxy resin to which a catalyst has optionally been added to accelerate the polymerization. The strip thus coated is subjected to a post-stress, calculated as a function of the stresses to which the strip will be subjected, then it is applied to the structure to be reinforced 5. It is then covered with the waterproof film 6 which is fixed on the structure by the adhesive strip 7, and a partial vacuum is produced in the space between the film 6 and the structure 5. The heating sheet 8 is applied to the film 6 and it is heated to a temperature generally between 11O "C and 1200C. The polymerization and therefore the hardening of the resin are obtained after 1/2 hour to 1 hour depending on the nature of the resin used.
La mise en post-contrainte de la bande peut être réalisée en utilisant un dispositif tel que celui représenté sur les figures 6 et 7. Celui-ci comporte une pièce métallique 20 munie d'une lumière 21 dont la longueur est légèrement supérieure a la largeur de la bande et dans laquelle cette bande forme une boucle par collage sur elle-même en 22 par un tube ou 2par une tige 23 de longueur appropriee. Un effort de traction/exercé par un vérin ou tout autre dispositif par l'intermédiaire de l'orifice 25 assure une contrainte calculée au préalable sur la bande 1. The post-stressing of the strip can be carried out using a device such as that shown in FIGS. 6 and 7. This comprises a metal part 20 provided with a light 21 whose length is slightly greater than the width of the strip and in which this strip forms a loop by gluing on itself at 22 by a tube or 2 by a rod 23 of suitable length. A tensile force / exerted by a jack or any other device via the orifice 25 ensures a stress calculated beforehand on the strip 1.
Sur les figures 2 a 5, on a illustré quelques exemples d'application du procédé conforme a l'invention. In FIGS. 2 to 5, a few examples of application of the method according to the invention have been illustrated.
La figure 2 représente une pièce en béton de forme courbe, qui a été renforcée par application sur sa face supérieure d'une armature 1 conforme a l'invention. FIG. 2 represents a concrete part of curved shape, which has been reinforced by application on its upper face of a frame 1 according to the invention.
On a représenté sur la figure 3 une vue en coupe de deux poutrelles accolées. Ces poutrelles sont renforcées sur leur face supérieure par une bande 11 et sur leur face inférieure par une bande longitudinale 12. Cette dernièreremplit une double fonction : tout d'abord celle d'éviter l'écartement des deux poutrelles puis celle d'accroître la résistance des poutrelles aux efforts longitudinaux. There is shown in Figure 3 a sectional view of two contiguous beams. These beams are reinforced on their upper face by a strip 11 and on their lower face by a longitudinal strip 12. The latter fulfills a double function: firstly that of avoiding the separation of the two beams then that of increasing the resistance beams with longitudinal forces.
Sur la figure 4, on a représenté une vue en coupe d'un ouvrage en béton armé ou précontraint renforcé par des armatures conformes a l'invention. L'armature 15 appliquée sur la face supérieure du hourdis permet d'accroître la résistance aux efforts de traction. L'armature 13 appliquée sur l'un des flancs et sur une partie de la face inférieure du hourdis et l'armature 14 a l'intérieur du caisson permettent de renforcer par l'extérieur et par l'intérieur la résistance de la structure aux efforts tranchants des âmes. Rzs bandes longitudinales 16 et 17, respectivement appliquées sur la face inférieure du hourdis et a l'intérieur du caisson, permettent d'accroître la résistance aux efforts de flexion. f"s bandes 18 et 19, respectivement placées a la liaison âme-hourdis superieur et sur le hourdis supérieur, contribuent de la même façon a accroître la résistance aux efforts de flexion. In Figure 4, there is shown a sectional view of a structure of reinforced or prestressed concrete reinforced with reinforcements according to the invention. The frame 15 applied to the upper face of the slab increases the resistance to tensile stresses. The reinforcement 13 applied on one of the sides and on a part of the underside of the slab and the reinforcement 14 inside the box make it possible to reinforce from the outside and from the inside the resistance of the structure to sharp efforts of souls. Rzs longitudinal strips 16 and 17, respectively applied to the underside of the slab and inside the box, increase the resistance to bending forces. the bands 18 and 19, respectively placed at the upper core-slab connection and on the upper slab, likewise contribute to increasing the resistance to bending forces.
Sur la figure 5, on a représenté une vue en coupe longitudinale d'une poutre à inertie variable qui a été renforcée a la flexion par une bande longitudinale 16 appliquée sur la face inférieure de la poutre. In Figure 5, there is shown a longitudinal sectional view of a beam with variable inertia which has been reinforced by bending by a longitudinal strip 16 applied to the underside of the beam.
I1 va de soi que l'invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, mais qu'elle en embrasse au contraire toutes les variantes entrant dans le cadre des équivalences. It goes without saying that the invention is not limited to the embodiments which have just been described, but that on the contrary it embraces all the variants coming within the framework of equivalences.
C'est ainsi qu'il est possible de disposer sur la structure a renforcer plusieurs bandes l'une sur l'autre. Une telle disposition peut être avantageuse lorsqu'il s'agit par exemple de renforcer une poutre telle que celle représentée sur la figure 5, destinée a travailler sous moment de flexion. This is how it is possible to arrange on the structure to be reinforced several strips one on the other. Such an arrangement can be advantageous when it is for example a question of reinforcing a beam such as that shown in FIG. 5, intended to work under bending moment.
D'une façon générale, on aura avantageusement recours au procédé conforme a l'invention chaque fois qu'il s'agira de renforcer ou de conforter des ouvrages fissurés, et notamment ceux présentant des surfaces courbes ou complexes. In general, it will be advantageous to use the process according to the invention each time it is a question of reinforcing or reinforcing cracked structures, and in particular those having curved or complex surfaces.
Le procédé conforme a l'invention n'est pas limité au renforcement de structures en béton, mais il s'applique de la même façon au renforcement d'élément en bois tels que des poutres que l'on souhaite consolider en raison d'une dégradation de leurs propriétés mécaniques ou d'un accroissement de la charge qu'elles sont appelées a supporter. The process according to the invention is not limited to the reinforcement of concrete structures, but it applies in the same way to the reinforcement of wooden elements such as beams which it is desired to consolidate due to a degradation of their mechanical properties or an increase in the load they are called upon to bear.
Les armatures conformes a 1 l'invention présentent, sur les armatures jusqu'ici utilisées, de nombreux avantages - grâce à leur grande souplesse, elles épousent les formes les plus variées des supports sur lesquels elles sont appliquées; - elles peuvent être très rapidement mises en place; - elles sont d'un bas prix de revient - ces armatures, qui ont sensiblement la couleur du béton, ne nuisent pas à l'esthétique des ouvrages sur lesquels elles sont appliquées, comme le font des tôles collées par exemple. The reinforcements according to the invention have numerous advantages over the reinforcements hitherto used - thanks to their great flexibility, they conform to the most varied forms of the supports on which they are applied; - they can be set up very quickly; - They are of a low cost price - these reinforcements, which have appreciably the color of the concrete, do not harm the esthetics of the works on which they are applied, as do glued sheets for example.
A titre illustratif, il est décrit, ci-dessous, un exemple de réalisation de l'invention, appliqué au renforcement d'un plancher sur poutrelles préfabriquées en béton précontraint. By way of illustration, an embodiment of the invention is described below, applied to the reinforcement of a floor on prefabricated beams of prestressed concrete.
Le plancher est composé - de poutrelles d'une hauteur de 0,22 m et ayant une largeur au talon de 0,10 m; ces poutrelles sont précontraintes par une armature de fils adhérents. The floor is made up of - beams with a height of 0.22 m and a heel width of 0.10 m; these beams are prestressed by a reinforcement of adherent wires.
L'espacement entre les poutrelles est de 0,45 m et leur portée est de 5,80 m; - d'un hourdis comportant une dalle de compression ayant une épaisseur de 0,06 m et armée d'un treillis soudé. The spacing between the beams is 0.45 m and their span is 5.80 m; - a slab comprising a compression slab having a thickness of 0.06 m and armed with a welded mesh.
Le poids propre du hourdis est de 150 kg/m2, celui des poutrelles de 98 kg/m2 et celui du revêtement de 6 kg/m2, 2 soit au total un poids de 254 kg/m . Le plancher est prévu pour supporter une charge de 400 kg/m2, ce qui, avec son poids propre, représente 654 kg/m2. The self-weight of the slab is 150 kg / m2, that of the beams 98 kg / m2 and that of the covering 6 kg / m2, 2 for a total weight of 254 kg / m. The floor is designed to support a load of 400 kg / m2, which, with its own weight, represents 654 kg / m2.
La modification de l'aménagement des locaux conduit à implanter, sur le plancher, un stockage en casiers posés au droit des poutrelles a raison de 2.650 kg par poutrelle. The modification of the layout of the premises led to the establishment, on the floor, of storage in racks placed in line with the beams at the rate of 2,650 kg per beam.
Cette modification conduit a une augmentation du moment de flexion maximal des poutrelles, qui passe de 1.237 kg/m à 2.990 kg/m. This modification leads to an increase in the maximum bending moment of the beams, which goes from 1.237 kg / m to 2.990 kg / m.
I1 en résulte une contrainte supplémentaire de 2.990 - 1.237, soit 7.012 kg. This results in an additional stress of 2,990 - 1,237, or 7,012 kg.
0,25 On applique sur la sous-face des poutrelles un ruban de KEVLAR 49 à structure unidirectionnelle. Le KEVLAR 49 est une fibre polyamide fabriquée par DU PONT DE NEMOURS, se caractérisant par un module et une résistance mécanique élevés (résistance
2 à la rupture : 270 kg/mm ). 0.25 A KEVLAR 49 tape with a unidirectional structure is applied to the underside of the beams. KEVLAR 49 is a polyamide fiber manufactured by DU PONT DE NEMOURS, characterized by a high modulus and mechanical resistance (resistance
2 at break: 270 kg / mm).
Le ruban mis en oeuvre répond a ces caractéristiques - épaisseur : 2,2 mm - largeur : 50 mm - section utile : 0,6 x 110 = 66 mm2 - charge de rupture : 66 x 270 = 17.820 kg - longueur : 4,4 m. The ribbon used meets these characteristics - thickness: 2.2 mm - width: 50 mm - useful section: 0.6 x 110 = 66 mm2 - breaking load: 66 x 270 = 17.820 kg - length: 4.4 m.
Ce ruban est imprégné d'une résine époxyde BP 907 d'AMERICAN CYANAMID. This tape is impregnated with an epoxy resin BP 907 from AMERICAN CYANAMID.
On applique avant polymérisation une charge de postcontrainte de 3.500 kg. A post-stress load of 3,500 kg is applied before polymerization.
La contrainte maximale sous charge est de 10.500 kg, soit 59 de la charge de rupture. The maximum stress under load is 10,500 kg, or 59 of the breaking load.
La contrainte d'adhérence sur 0,5 m est égale à
2 10.500 , soit 0,42 kg/mm 50 x 500 The adhesion stress over 0.5 m is equal to
2 10.500, i.e. 0.42 kg / mm 50 x 500
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8602562A FR2594871B1 (en) | 1986-02-25 | 1986-02-25 | METHOD FOR REINFORCING STRUCTURES OR STRUCTURAL ELEMENTS, ESPECIALLY IN CONCRETE, REINFORCED CONCRETE, PRE-STRESSED CONCRETE WITH FLEXIBLE REINFORCEMENT, ARRANGEMENT DEVICE, AND REINFORCEMENT IMPLEMENTED IN SAID PROCESS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8602562A FR2594871B1 (en) | 1986-02-25 | 1986-02-25 | METHOD FOR REINFORCING STRUCTURES OR STRUCTURAL ELEMENTS, ESPECIALLY IN CONCRETE, REINFORCED CONCRETE, PRE-STRESSED CONCRETE WITH FLEXIBLE REINFORCEMENT, ARRANGEMENT DEVICE, AND REINFORCEMENT IMPLEMENTED IN SAID PROCESS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2594871A1 true FR2594871A1 (en) | 1987-08-28 |
| FR2594871B1 FR2594871B1 (en) | 1990-10-12 |
Family
ID=9332494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8602562A Expired - Lifetime FR2594871B1 (en) | 1986-02-25 | 1986-02-25 | METHOD FOR REINFORCING STRUCTURES OR STRUCTURAL ELEMENTS, ESPECIALLY IN CONCRETE, REINFORCED CONCRETE, PRE-STRESSED CONCRETE WITH FLEXIBLE REINFORCEMENT, ARRANGEMENT DEVICE, AND REINFORCEMENT IMPLEMENTED IN SAID PROCESS |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2594871B1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0378232A1 (en) * | 1989-01-12 | 1990-07-18 | Mitsubishi Kasei Corporation | Method for reinforcing concrete structures |
| EP0645239A1 (en) * | 1993-09-28 | 1995-03-29 | Tonen Corporation | Reinforcing fiber sheet and structure reinforced thereby |
| EP0709524A1 (en) * | 1994-10-28 | 1996-05-01 | Tonen Corporation | Method of reinforcing concrete slabs |
| WO1996022432A1 (en) * | 1995-01-21 | 1996-07-25 | Devonport Management Limited | Reinforcement of structural members |
| EP0835355A1 (en) * | 1995-06-29 | 1998-04-15 | Hexcel-Fyfe Co.L.L.C. | Fabric reinforced beams and beam connections |
| WO1999006652A1 (en) * | 1997-07-31 | 1999-02-11 | Sika Ag, Vormals Kaspar Winkler & Co. | Method for fastening a flat strip lamella to the surface of a building component |
| WO1999043909A1 (en) * | 1998-02-26 | 1999-09-02 | Eidgenössische Materialprüfungs- und Forschungsanstalt Empa | Method and device for applying pretensed tension-proof reinforcing strips to a construction |
| WO2000024989A1 (en) * | 1998-10-28 | 2000-05-04 | Leonhardt Andrä und Partner Beratende Ingenieure VBI GmbH | Clamping device for a band-shaped tensional member |
| FR2790500A1 (en) | 1999-03-01 | 2000-09-08 | Freyssinet Int Stup | METHOD AND DEVICE FOR REINFORCING A CONCRETE STRUCTURE |
| EP2295675A1 (en) | 2009-08-03 | 2011-03-16 | Soletanche Freyssinet | Reinforcement method for a construction structure and structure reinforced in this way |
| ITPG20120010A1 (en) * | 2012-02-28 | 2012-05-29 | Kimia Spa | PROFILES IN COMPOSITE MATERIALS PRE-COUPLED WITH MECHANICAL ANCHORING SYSTEMS AND PRETENSIONING FOR THE REINFORCEMENT OF BUILDING COMPONENTS. |
| CN103306214A (en) * | 2013-05-27 | 2013-09-18 | 华侨大学 | Novel reinforcement device for reinforced concrete beam and floor slab and construction method thereof |
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| GB1073714A (en) * | 1963-06-11 | 1967-06-28 | Erik Lundstrom | Improvements relating to reinforced pipes and beams |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447593A (en) * | 1989-01-12 | 1995-09-05 | Mitsubishi Chemical Corporation | Method for reinforcing concrete structures |
| EP0378232A1 (en) * | 1989-01-12 | 1990-07-18 | Mitsubishi Kasei Corporation | Method for reinforcing concrete structures |
| US5635263A (en) * | 1993-09-28 | 1997-06-03 | Tonen Corporation | Reinforcing fiber sheet and concrete structure using same |
| EP0645239A1 (en) * | 1993-09-28 | 1995-03-29 | Tonen Corporation | Reinforcing fiber sheet and structure reinforced thereby |
| US5711834A (en) * | 1994-10-28 | 1998-01-27 | Tonen Corporation | Method of reinforcing concrete slab |
| EP0709524A1 (en) * | 1994-10-28 | 1996-05-01 | Tonen Corporation | Method of reinforcing concrete slabs |
| WO1996022432A1 (en) * | 1995-01-21 | 1996-07-25 | Devonport Management Limited | Reinforcement of structural members |
| US5879778A (en) * | 1995-01-21 | 1999-03-09 | Davonport Management Limited | Strengthening of structural members |
| AU706549B2 (en) * | 1995-01-21 | 1999-06-17 | Devonport Royal Dockyard Limited | Strengthening of structural members |
| EP0835355A1 (en) * | 1995-06-29 | 1998-04-15 | Hexcel-Fyfe Co.L.L.C. | Fabric reinforced beams and beam connections |
| EP0835355A4 (en) * | 1995-06-29 | 1999-03-31 | Hexcel Fyfe Co L L C | Fabric reinforced beams and beam connections |
| AU738761B2 (en) * | 1997-07-31 | 2001-09-27 | Sika Schweiz Ag | Method for fastening a flat strip lamella to the surface of a building component |
| WO1999006652A1 (en) * | 1997-07-31 | 1999-02-11 | Sika Ag, Vormals Kaspar Winkler & Co. | Method for fastening a flat strip lamella to the surface of a building component |
| US6605168B1 (en) | 1997-07-31 | 2003-08-12 | Sika Schweiz Ag | Method for fastening a flat strip lamella to the surface of a building component |
| WO1999043909A1 (en) * | 1998-02-26 | 1999-09-02 | Eidgenössische Materialprüfungs- und Forschungsanstalt Empa | Method and device for applying pretensed tension-proof reinforcing strips to a construction |
| AU741986B2 (en) * | 1998-02-26 | 2001-12-13 | Eidgenossische Materialprufungs- Und Forschungsanstalt Empa | Method and device for applying pretensed tension-proof reinforcing strips to a construction |
| US6464811B1 (en) * | 1998-02-26 | 2002-10-15 | Eidgenössiche Materialprüfungs-und Forschungsanstalt EMPA | Method and device for applying pretensed tension-proof reinforcing strips to a construction |
| US6584738B1 (en) | 1998-10-28 | 2003-07-01 | Leonhardt Andrä und Partner Beratende Ingenieure VBI GmbH | Clamping device for a band-shaped tensional member |
| WO2000024989A1 (en) * | 1998-10-28 | 2000-05-04 | Leonhardt Andrä und Partner Beratende Ingenieure VBI GmbH | Clamping device for a band-shaped tensional member |
| FR2790500A1 (en) | 1999-03-01 | 2000-09-08 | Freyssinet Int Stup | METHOD AND DEVICE FOR REINFORCING A CONCRETE STRUCTURE |
| EP2295675A1 (en) | 2009-08-03 | 2011-03-16 | Soletanche Freyssinet | Reinforcement method for a construction structure and structure reinforced in this way |
| ITPG20120010A1 (en) * | 2012-02-28 | 2012-05-29 | Kimia Spa | PROFILES IN COMPOSITE MATERIALS PRE-COUPLED WITH MECHANICAL ANCHORING SYSTEMS AND PRETENSIONING FOR THE REINFORCEMENT OF BUILDING COMPONENTS. |
| CN103306214A (en) * | 2013-05-27 | 2013-09-18 | 华侨大学 | Novel reinforcement device for reinforced concrete beam and floor slab and construction method thereof |
| CN103306214B (en) * | 2013-05-27 | 2015-11-04 | 华侨大学 | The bracing means of a kind of reinforced concrete beam and floor |
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| Publication number | Publication date |
|---|---|
| FR2594871B1 (en) | 1990-10-12 |
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