EP0269497A1 - Reinforcement of supporting structure elements by inserting highly resistant plates - Google Patents

Reinforcement of supporting structure elements by inserting highly resistant plates Download PDF

Info

Publication number
EP0269497A1
EP0269497A1 EP87402468A EP87402468A EP0269497A1 EP 0269497 A1 EP0269497 A1 EP 0269497A1 EP 87402468 A EP87402468 A EP 87402468A EP 87402468 A EP87402468 A EP 87402468A EP 0269497 A1 EP0269497 A1 EP 0269497A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing
plates
resin
element according
cavities
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
EP87402468A
Other languages
German (de)
French (fr)
Other versions
EP0269497B1 (en
Inventor
Philippe Wolf
André Pachet
Claude Robert
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0269497A1 publication Critical patent/EP0269497A1/en
Application granted granted Critical
Publication of EP0269497B1 publication Critical patent/EP0269497B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood

Definitions

  • the present invention relates to a method of reinforcing structural elements or building structures, in particular of wood, such as beams.
  • French Patent No. 2,170,498 of BOUWECONOMISCH IN TECHNOLOGHISCH ADVIESBUREAU discloses a method of building wooden beams in the region of their support by reinforcement rods embedded in holes drilled in the timber and secured to the timber by a curable paste resin-based.
  • This process has several drawbacks: on the one hand, it is difficult to size the reinforcing rods because we do not always know the direction and intensity of the forces to be taken up in a degraded beam, on the other hand, this process only concerns beam reinforcements at their supports. Finally, reinforcing rods work especially in traction, and it is the degraded beam which must provide the additional mechanical resistance necessary for the resumption of bending moments and compression forces.
  • An object of the present invention is to provide a method of reinforcing structural elements or building structures, in particular of wood, such as beams, without adding structural reinforcing parts to the exterior of said elements, and while preserving the original shape and size of these elements, as well as their appearance in most cases.
  • Another object of the present invention is that said reinforcement is easily calculable, and that it is possible by implementing it to reinforce a wooden element both at the level of its supports and in other places, or even throughout its length.
  • a method of reinforcing structural elements or building structures, in particular of wood, such as beams comprises the following steps: - dig substantially flat cavities in the areas to be reinforced of the element; - inserting into said cavities reinforcement plates; filling said cavities with a curable resin-based filling product so as to secure said plates to the element, said reinforcing plates being sufficiently strong and dimensioned to provide restore or give the element the desired inertia after joining.
  • the cavities are for example rebates or grooves dug in the wood.
  • the resin product can be an epoxy resin, a grout or a resin mortar, which adheres strongly to both the wood and the material of the reinforcing plates, which can be metal, wood, plastic, or any other sufficiently rigid and resistant material.
  • the plates can also be of expanded metal.
  • connection of the reinforcement plates with the grout or the resin mortar can be improved, either by perforating or perforating the reinforcement plates, or by equipping them with projections or reliefs such than ankles or nipples.
  • the degraded areas can be regenerated beforehand by impregnation by capillary action or injection of product based on fluid resins, possibly solvent-based, or recharged with a semi-flexible resin mortar, the elasticity will have been adjusted according to that of the wood.
  • FIG. 1a there is shown a beam 1 of rectangular section in cross section.
  • a first zone 2 is healthy, while a second zone 3 is degraded by rotting.
  • the broken lines show the initial beam shape.
  • FIG. 1b cavities in the form of grooves 4 have been dug in the beam.
  • the grooves cross the degraded zone 3 and enter the healthy zone 2.
  • FIG. 1c illustrates a later phase of the beam reinforcement: the degraded zone 3 has been impregnated with resin, and longitudinal reinforcement plates 5 have been placed in said grooves 4.
  • the reinforcement plates 5 are pierced with holes 6.
  • the reinforcement is finished: a resin grout 7 was injected into said grooves 4 around the plates 5, and the shape of the beam was reconstituted by an addition of material in 8, which can be a resin mortar.
  • the holes 6 have dimensions such that they are filled with resin grout during injection, which improves the connection of the reinforcement plates with the rest of the beam 1.
  • Figure 2 is a cross section of a reinforced beam according to another variant of the method of the present invention.
  • a beam 11 a healthy area 12, a degraded area 13 regenerated by impregnation of resin, a groove 14, which extends longitudinally, and a reinforcing plate 15 inserted in said groove.
  • the reinforcing plate 15 is provided with pins or dowels 16 for securing in order to improve the joining of said plate to the rest of the beam 11. Said dowels also make it possible to position the reinforcing plate 15 in the groove before injection and setting the resin grout.
  • FIG. 3 there is shown in longitudinal section a buttress of recessed beam reinforced according to the method of the present invention.
  • a wooden beam 21 is embedded in a load-bearing wall 20.
  • a first zone 22 of the beam is healthy and a second zone 23 located near the wall is degraded, for example by decay. There is a lack of wood at the end of the beam, at the level of the embedding.
  • a reinforcing plate 25 has been introduced into a longitudinal groove not shown, but similar to those 4, 14 described previously with reference to FIGS. 1 and 2.
  • the reinforcing plate extends in a part from the healthy zone 22, passes through the degraded zone 23 and protrudes from this second zone towards the outside, to the end of the beam as it originally appeared.
  • a resin grout is then injected which fills all the voids, around the reinforcement plates in the groove, said plates thus being embedded in the resin grout, and between what remains of the beam and the wall 20, in the housing embedding 28.
  • the excess resin permeates and strengthens the degraded or decomposed areas 23 of the wood, and gives them a resistance greater than their initial resistance.
  • the plate 25 can be provided with fixing holes or dowels 26 for fixing and positioning.
  • Figures 4a and 4b illustrate a variant of the method described with reference to Figure 3.
  • the method of the invention is used to reconstruct a beam end.
  • the end of a wooden beam 31 supported by this end in a wall 30 is degraded and the support must be restored.
  • Two longitudinal grooves 34 are dug in the beam and reinforcing plates 35 pierced with holes 36 are introduced into the grooves.
  • the reinforcement plates are here provided with bearing heels 40 at their lower part.
  • the grooves start from a healthy zone 32 of the beam, crossing the degraded zone 33 and extend towards the support up to the end of the beam as it appeared before its degradation.
  • a resin grout is injected into the grooves 34. It fills these grooves, permeates the degraded area 33 and replaces the missing material 38, here wood, at the end of the beam.
  • a seal bottom 39 can be provided to limit resin overflows.
  • the method of the invention can also be used to allow a beam to withstand forces for which it was not originally intended.
  • This application of the process of the invention is illustrated in FIG. 5.
  • a wooden beam 41 is cracked in the middle according to surfaces defined by oblique lines 42.
  • props 43 After having taken up the deflection of the beam by means of props 43, one digs in the lower part of the beam one or more longitudinal grooves 44 in each of which a reinforcing plate 45 is drilled with holes 46.
  • injection drilling 47, 48 which intersects the rupture cracks 42 in the beam 41, a resin-based product is injected into these drilling. In this way, the resin product travels through the cracks and restores the monolithism of the beam.
  • the grooves are also filled with resin.
  • the plate 51 is pierced with securing holes 56.
  • the beam has been restored to its initial strength after hardening of the resin injected into the groove 54 around the metal plate.
  • the metal plate It is easy to size the metal plate, because it was enough here to give it the same mechanical resistance as the wooden beam from the point of view of bending moments and sharp forces, the rest of the wooden beam being used here only for s opposing the buckling of the compressed part of the metal plate, above its neutral axis.
  • the method of the present invention is particularly applicable to the reinforcement of building structures, for example in the context of rehabilitation, conversion or restoration of building operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

A method for reinforcing a building structure element (1) comprises the following steps: cavities (4) are hollowed out in the zones to be reinforced by the element; reinforcement plates (5) pierced through with holes are inserted into the said cavities; the said cavities and the said holes are filled by means of a resin-based curable filling product so as to solidly bond the said plates to the element, the said reinforcement plates being sufficiently strong and dimensioned in order that they can render or impart to the element the desired stability after firmly bonding. It may further comprise the replacement of a missing portion (8) of the said wooden element with a resin mortar and the impregnation of damaged portions (3) of the said element with a fluid resin-based material. The said reinforcement plates (5) may be of wood, steel, metal or rigid plastic, are pierced with holes (6) and are equipped with dowels for positioning and for firmly securing, and comprise bearing projections. Application especially to operations for rehabilitating and restoring buildings. <IMAGE>

Description

La présente invention concerne un procédé de renforcement d'éléments de charpente ou de structures de bâtiment, notamment en bois, tels que des poutres.The present invention relates to a method of reinforcing structural elements or building structures, in particular of wood, such as beams.

On peut être amené à renforcer des poutres et éléments de charpente en bois pour différentes raisons:
- altération du bois par suite des intempéries ou de l'attaque par des larves d'insectes, des algues, des champignons, des micro-organisms (pourritures). Ces altérations touchent fréquemment par exemple les extrémités de poutres encastrées, à cause notamment de l'humidité qui peut régner autour de la poutre au niveau de l'encastrement par absence de ventilation;
- apparition de charges anormales pouvant entraîner la rupture de fibres : surcharge des planchers, modification de la géométrie des assemblages par suite de tassements des fondations, etc... .We can reinforce wooden beams and structural elements for different reasons:
- weathering of the wood due to bad weather or attack by insect larvae, algae, fungi, micro-organisms (rots). These alterations frequently affect for example the ends of embedded beams, in particular because of the humidity which can reign around the beam at the level of the embedding by absence of ventilation;
- appearance of abnormal loads which can lead to the breaking of fibers: overloading of floors, modification of the geometry of assemblies due to settlement of foundations, etc ....

Le brevet français no 2.170.498 de BOUWECONOMISCH EN TECHNOLOGHISCH ADVIESBUREAU décrit un procédé de renforcement de poutres en bois dans la région de leur appui par des tiges d'armature enfoncées dans des trous forés dans le bois et solidarisées au bois par une pâte durcissable à base de résine. Ce procédé présente plusieurs inconvénients : d'une part il est difficile de dimensionner les tiges d'armatures car on ne connaît pas toujours la direction et l'intensité des forces à reprendre dans une poutre dégradée, d'autre part ce procédé ne concerne que les renforcements de poutres au niveau de leurs appuis. Enfin, des tiges d'armature travaillent surtout en traction, et c'est la poutre dégradée qui doit fournir le complément de résistance mécanique nécessaire à la reprise des moments fléchissants et des efforts de compression.French Patent No. 2,170,498 of BOUWECONOMISCH IN TECHNOLOGHISCH ADVIESBUREAU discloses a method of building wooden beams in the region of their support by reinforcement rods embedded in holes drilled in the timber and secured to the timber by a curable paste resin-based. This process has several drawbacks: on the one hand, it is difficult to size the reinforcing rods because we do not always know the direction and intensity of the forces to be taken up in a degraded beam, on the other hand, this process only concerns beam reinforcements at their supports. Finally, reinforcing rods work especially in traction, and it is the degraded beam which must provide the additional mechanical resistance necessary for the resumption of bending moments and compression forces.

Un but de la présente invention est de proposer un procédé de renforcement d'élements de charpente ou de structures de bâtiment, notamment en bois, tels que des poutres, sans ajouter de pièces de renforcement structurelles à l'extérieur desdits éléments, et tout en préservant la forme et l'encombrement d'origine de ces éléments, ainsi que leur aspect dans la plupart des cas. Un autre but de la présente invention est que ledit renforcement soit facilement calculable, et qu'il soit possible en le mettant en oeuvre de renforcer un élément en bois tant au niveau de ses appuis qu'en d'autres endroits, voire sur toute sa longueur.An object of the present invention is to provide a method of reinforcing structural elements or building structures, in particular of wood, such as beams, without adding structural reinforcing parts to the exterior of said elements, and while preserving the original shape and size of these elements, as well as their appearance in most cases. Another object of the present invention is that said reinforcement is easily calculable, and that it is possible by implementing it to reinforce a wooden element both at the level of its supports and in other places, or even throughout its length.

Selon la présente invention, un procédé de renforcement d'éléments de charpente ou de structures de bâtiment, notamment en bois, tels que des poutres, comprend les étapes suivantes:
- creuser des cavités sensiblement planes dans les zones à renforcer de l'élément ;
- insérer dans lesdites cavités des plaques de renforcement ;
- remplir lesdites cavités d'un produit durcissable de remplissage à base de résine de façon à solidariser lesdits plaques à l'élément,
lesdites plaques de renforcement étant suffisamment résistantes et dimensionnées pour pourvoir restituer ou conférer à l'élément l'inertie souhaitée après solidarisation.According to the present invention, a method of reinforcing structural elements or building structures, in particular of wood, such as beams, comprises the following steps:
- dig substantially flat cavities in the areas to be reinforced of the element;
- inserting into said cavities reinforcement plates;
filling said cavities with a curable resin-based filling product so as to secure said plates to the element,
said reinforcing plates being sufficiently strong and dimensioned to provide restore or give the element the desired inertia after joining.

Les cavités sont par exemple des feuillures ou des rainures creusées dans le bois.The cavities are for example rebates or grooves dug in the wood.

Le produit à base de résine peut être une résine époxydique, un coulis ou un mortier de résine, adhérant fortement aussi bien sur le bois que sur le matériau des plaques de renforcement, lequel peut être du métal, du bois, une matière plastique, ou tout autre matériau suffisamment rigide et résistant. Les plaques peuvent également être de métal déployé.The resin product can be an epoxy resin, a grout or a resin mortar, which adheres strongly to both the wood and the material of the reinforcing plates, which can be metal, wood, plastic, or any other sufficiently rigid and resistant material. The plates can also be of expanded metal.

Selon un mode de réalisation avantageux de l'invention, la solidarisation des plaques de renforcement avec le coulis ou le mortier de résine peut être améliorée, soit en perforant ou en ajourant les plaques de renforcement, soit en les équipant de saillies ou de reliefs tels que des chevilles ou des tétons.According to an advantageous embodiment of the invention, the connection of the reinforcement plates with the grout or the resin mortar can be improved, either by perforating or perforating the reinforcement plates, or by equipping them with projections or reliefs such than ankles or nipples.

Toujours selon l'invention, si l'élément comporte des zones dégradées, les zones dégradées peuvent préalablement être régénérées par imprégnation par capillarité ou injection de produit à base de résines fluides, éventuellement solvantées, ou rechargées avec un mortier de résine semi-souple dont l'élasticité aura été ajustée en fonction de celle du bois.Still according to the invention, if the element comprises degraded areas, the degraded areas can be regenerated beforehand by impregnation by capillary action or injection of product based on fluid resins, possibly solvent-based, or recharged with a semi-flexible resin mortar, the elasticity will have been adjusted according to that of the wood.

D'autres caractéristiques et avantages de la présente invention apparaîtront mieux à la lecture de la description suivante donnée à titre d'exemples non limitatifs des formes possibles de réalisation de l'invention, en regard des dessins ci-joints et qui fera bien comprendre comment l'invention peut être réalisée.Other characteristics and advantages of the present invention will appear better on reading the following description given by way of nonlimiting examples of the possible embodiments of the invention, with reference to the attached drawings and which will make it clear how the invention can be realized.

Sur les dessins:

  • les figures 1a à 1d sont des coupes transversales de principe illustrant différentes étapes du renforcement d'un élément selon un mode de réalisation du procédé de l'invention;
  • la figure 2 est une coupe transversale de principe d'un élément renforcé selon un autre mode de réalisation du procédé de l'invention ;
  • la figure 3 est une coupe longitudinale de principe d'un about pourri de poutre encastrée renforcé selon le procédé de l'invention ;
  • la figure 4a est une coupe longitudinale de principe d'un autre about de poutre encastrée renforcé selon le procédé de l'invention;
  • la figure 4b est une coupe transversale de principe de l'about de poutre de la figure 4a, selon la ligne XX;
  • la figure 5 est une vue partielle de côté d'une poutre surchargée en cours de renforcement selon le procédé de l'invention;
  • la figure 6 est une vue en perspective d'une poutre en bois à laquelle on a restitué sa résistance initiale sur toute sa longueur grâce au procédé.
In the drawings:
  • FIGS. 1a to 1d are cross-sections in principle illustrating different stages of the reinforcement of an element according to an embodiment of the method of the invention;
  • Figure 2 is a cross section in principle of a reinforced element according to another embodiment of the method of the invention;
  • Figure 3 is a longitudinal section in principle of a rotten butt end of a reinforced recessed beam according to the method of the invention;
  • FIG. 4a is a longitudinal section in principle of another end of a reinforced embedded beam according to the method of the invention;
  • Figure 4b is a cross section in principle of the beam end of Figure 4a, along line XX;
  • Figure 5 is a partial side view of an overloaded beam being reinforced according to the method of the invention;
  • FIG. 6 is a perspective view of a wooden beam to which its initial resistance has been restored over its entire length thanks to the process.

Sur la figure 1a, on a représenté une poutre 1 de section rectangulaire en coupe transversale. Une première zone 2 est saine, tandis qu'une deuxième zone 3 est dégradée par pourrissement. Les traits interrompus montrent la forme initiale de poutre. Sur la figure 1b, des cavités en forme de saignées 4 ont été creusées dans la poutre. Les saignées traversent la zone dégradée 3 et pénètrent dans la zone saine 2. La figure 1c illustre une phase ultérieure du renforcement de poutre: la zone dégradée 3 à été imprégnée de résine, et des plaques de renforcement longitudinales 5 ont été mises en place dans lesdites saignées 4. Les plaques de renforcement 5 sont percées de trous 6. Sur la figure 1d, le renforcement est terminé: on a injecté un coulis de résine 7 dans lesdites saignées 4 autour des plaques 5 , et la forme de la poutre a été reconstituée par un apport de matériau en 8, qui peut être un mortier de résine. Les trous 6 ont des dimensions telles qu'ils se sont remplis de coulis de résine lors de l'injection, ce qui améliore la solidarisation des plaques de renforcement avec le reste de la poutre 1.In Figure 1a, there is shown a beam 1 of rectangular section in cross section. A first zone 2 is healthy, while a second zone 3 is degraded by rotting. The broken lines show the initial beam shape. In FIG. 1b, cavities in the form of grooves 4 have been dug in the beam. The grooves cross the degraded zone 3 and enter the healthy zone 2. FIG. 1c illustrates a later phase of the beam reinforcement: the degraded zone 3 has been impregnated with resin, and longitudinal reinforcement plates 5 have been placed in said grooves 4. The reinforcement plates 5 are pierced with holes 6. In FIG. 1d, the reinforcement is finished: a resin grout 7 was injected into said grooves 4 around the plates 5, and the shape of the beam was reconstituted by an addition of material in 8, which can be a resin mortar. The holes 6 have dimensions such that they are filled with resin grout during injection, which improves the connection of the reinforcement plates with the rest of the beam 1.

La figure 2 est une coupe transversale d'une poutre renforcée selon une autre variante du procédé de la présente invention. On reconnaît une poutre 11, une zone saine 12, une zone dégradée 13 régénérée par imprégnation de résine, une saignée 14, qui s'étend longitudinalement, et une plaque de renforcement 15 introduite dans ladite saignée. Cette fois, la plaque de renforcement 15 est munie de tétons ou chevilles 16 de solidarisation pour améliorer la solidarisation de ladite plaque au reste de la poutre 11. Lesdites chevilles permettent également de positionner la plaque de renforcement 15 dans la saignée avant l'injection et la prise du coulis de résine.Figure 2 is a cross section of a reinforced beam according to another variant of the method of the present invention. We recognize a beam 11, a healthy area 12, a degraded area 13 regenerated by impregnation of resin, a groove 14, which extends longitudinally, and a reinforcing plate 15 inserted in said groove. This time, the reinforcing plate 15 is provided with pins or dowels 16 for securing in order to improve the joining of said plate to the rest of the beam 11. Said dowels also make it possible to position the reinforcing plate 15 in the groove before injection and setting the resin grout.

Sur la figure 3, on a représenté en coupe longitudinale un about de poutre encastrée renforcé selon le procédé de la présente invention. Une poutre en bois 21 est encastrée dans un mur porteur 20. Une première zone 22 de la poutre est saine et une deuxième zone 23 située près du mur est dégradée, par exemple par pourriture. Il manque du bois au bout de la poutre, au niveau de l'encastrement. Selon le procédé de l'invention, on a introduit une plaque de renforcement 25 dans une saignée longitudinale non représentée, mais similaire à celles 4, 14 décrites précédemment en références aux figures 1 et 2. La plaque de renforcement s'étend dans une partie de la zone saine 22, passe par la zone dégradée 23 et dépasse de cette deuxième zone vers l'extérieur, jusqu'au bout de la poutre telle qu'elle se présentait à l'origine. On injecte ensuite un coulis de résine qui remplit tous les vides, autour des plaques de renforcement dans la saignée, lesdites plaques se trouvant ainsi noyées dans le coulis de résine, et entre ce qui reste de la poutre et le mur 20, dans le logement d'encastrement 28. De plus, l'excédent de résine imprègne et renforce les zones dégradées ou décomposées 23 du bois, et leur confère une résistance supérieure à leur résistance initiale. Comme précédemment, la plaque 25 peut être munie de trous de solidarisation ou de chevilles 26 de solidarisation et de positionnement.In Figure 3, there is shown in longitudinal section a buttress of recessed beam reinforced according to the method of the present invention. A wooden beam 21 is embedded in a load-bearing wall 20. A first zone 22 of the beam is healthy and a second zone 23 located near the wall is degraded, for example by decay. There is a lack of wood at the end of the beam, at the level of the embedding. According to the method of the invention, a reinforcing plate 25 has been introduced into a longitudinal groove not shown, but similar to those 4, 14 described previously with reference to FIGS. 1 and 2. The reinforcing plate extends in a part from the healthy zone 22, passes through the degraded zone 23 and protrudes from this second zone towards the outside, to the end of the beam as it originally appeared. A resin grout is then injected which fills all the voids, around the reinforcement plates in the groove, said plates thus being embedded in the resin grout, and between what remains of the beam and the wall 20, in the housing embedding 28. In addition, the excess resin permeates and strengthens the degraded or decomposed areas 23 of the wood, and gives them a resistance greater than their initial resistance. As before, the plate 25 can be provided with fixing holes or dowels 26 for fixing and positioning.

Les figures 4a et 4b illustrent une variante du procédé décrit en référence à la figure 3. Cette fois, le procédé de l'invention est utilisé pour reconstituer un about de poutre. L'extrémité d'une poutre en bois 31 appuyée par cette extrémité dans un mur 30 est dégradée et il faut reconstituer l'appui. Deux saignées longitudinales 34 sont creusées dans la poutre et des plaques de renforcement 35 percées de trous 36 sont introduites dans les saignées. Les plaques de renforcement sont ici munies de talons d'appui 40 à leur partie inférieure. Les saignées partent d'une zone saine 32 de la poutre, traversant la zone dégradée 33 et se prolongent vers l'appui jusqu'à l'extrémité de la poutre telle qu'elle se présentait avant sa dégradation. Comme précédemment, un coulis de résine est injecté dans les saignées 34. Il remplit ces saignées, imprègne la zone dégradée 33 et remplace la matière manquante 38, ici du bois, à l'extrémité de la poutre. Un fond de joint 39 peut être prévu pour limiter les débordements de résine.Figures 4a and 4b illustrate a variant of the method described with reference to Figure 3. This time, the method of the invention is used to reconstruct a beam end. The end of a wooden beam 31 supported by this end in a wall 30 is degraded and the support must be restored. Two longitudinal grooves 34 are dug in the beam and reinforcing plates 35 pierced with holes 36 are introduced into the grooves. The reinforcement plates are here provided with bearing heels 40 at their lower part. The grooves start from a healthy zone 32 of the beam, crossing the degraded zone 33 and extend towards the support up to the end of the beam as it appeared before its degradation. As before, a resin grout is injected into the grooves 34. It fills these grooves, permeates the degraded area 33 and replaces the missing material 38, here wood, at the end of the beam. A seal bottom 39 can be provided to limit resin overflows.

Le procédé de l'invention peut également être utilisé pour permettre à une poutre de résister à des efforts pour laquelle elle n'avait pas été prévue à l'origine. Cette application du procédé de l'invention est illustré sur la figure 5. A la suite d'une surcharge engendrant un moment fléchissant excessif, une poutre 41 en bois est fissurée en son milieu selon des surfaces définies par des lignes obliques 42. Selon l'invention, après avoir repris la flèche de la poutre au moyen d'étançons 43, on creuse dans la partie inférieure de la poutre une ou plusieurs saignées longitudinales 44 dans chacune desquelles on glisse une plaque de renforcement 45 percée de trous 46. Aprés avoir réalisé des forages d'injection 47, 48 qui recoupent les fissures de rupture 42 dans la poutre 41, on injecte un produit à base de résine dans ces forages. De cette façon, le produit à base de résine chemine dans les fissures et rétabli le monolithisme de la poutre. Comme précédemment, les saignées sont elles aussi remplies de résine.The method of the invention can also be used to allow a beam to withstand forces for which it was not originally intended. This application of the process of the invention is illustrated in FIG. 5. Following an overload causing an excessive bending moment, a wooden beam 41 is cracked in the middle according to surfaces defined by oblique lines 42. According to l invention, after having taken up the deflection of the beam by means of props 43, one digs in the lower part of the beam one or more longitudinal grooves 44 in each of which a reinforcing plate 45 is drilled with holes 46. After having carried out injection drilling 47, 48 which intersects the rupture cracks 42 in the beam 41, a resin-based product is injected into these drilling. In this way, the resin product travels through the cracks and restores the monolithism of the beam. As before, the grooves are also filled with resin.

Dans le dernier exemple, illustré sur la figure 6, une poutre en bois 51 de 8 mètres de long et de 0,4 x 0,4 m2 de section, encastrée en ses extrémités sur une profondeur de 0,40 m, a été renforcée sur toute sa longueur au moyen d'une plaque métallique 55 de 15 mm d'épaisseur insérée dans une saignée 54 de 20 mm de large partant du dessus de la poutre et s'arrêtant à 50 mm du bas de la poutre. La plaque 51 est percée de trous de solidarisation 56. Dans cet exemple, on a redonné à la poutre sa résistance initiale après durcissement de la résine injectée dans la saignée 54 autour de la plaque métallique. Il est facile de dimensionner la plaque métallique, car il suffisait ici de lui donner la même résistance mécanique que la poutre en bois du point du vue des moments fléchissants et efforts tranchants, le reste de la poutre en bois ne servant ici qu'a s'opposer au flambage de la partie comprimée de la plaque métallique, au-dessus de son axe neutre.In the last example, illustrated in Figure 6, a wooden beam 51 8 meters long and 0.4 x 0.4 m2 in section, embedded at its ends to a depth of 0.40 m, was reinforced over its entire length by means of a metal plate 55 15 mm thick inserted in a groove 54 20 mm wide starting from the top of the beam and stopping 50 mm from the bottom of the beam. The plate 51 is pierced with securing holes 56. In this example, the beam has been restored to its initial strength after hardening of the resin injected into the groove 54 around the metal plate. It is easy to size the metal plate, because it was enough here to give it the same mechanical resistance as the wooden beam from the point of view of bending moments and sharp forces, the rest of the wooden beam being used here only for s opposing the buckling of the compressed part of the metal plate, above its neutral axis.

Le procédé de la présente invention s'applique notamment au renforcement des structures de bâtiments, par exemple dans le cadre d'opérations de réhabilitation, de reconversion ou de restauration de bâtiment.The method of the present invention is particularly applicable to the reinforcement of building structures, for example in the context of rehabilitation, conversion or restoration of building operations.

Claims (9)

1. Procédé de reforcement d'un élément de structure de bâtiment (1, 11, 21, 31, 41, 51), notamment un élément en bois présentant des parties dégradées (3, 13, 23, 33), caractérisé en ce qu'il comprend les étapes suivantes:
- creuser des cavités en forme de feuillures ou de rainures (4, 14, 24, 34, 44, 54) dans les zones à renforcer de l'élément ;
- insérer dans lesdites cavités des plaques de renforcement (5, 15, 25, 35, 45, 55) percées de trous (6, 26, 36, 46, 56);
- remplir simultanément lesdites cavités (4, 14, 24, 34, 44, 54) et lesdits trous (6, 26, 36, 46, 56) d'un produit durcissable de remplissage à base de résine de façon à solidariser lesdites plaques à l'élément, lesdits trous permettant une meilleure solidarisation desdites plaques audit produit après durcissement,
lesdites plaques de renforcement étant suffisamment résistantes et dimensionnées pour pouvoir restituer ou conférer audit élément l'inertie souhaitée après durcissement.1. Method for reinforcing a building structure element (1, 11, 21, 31, 41, 51), in particular a wooden element having degraded parts (3, 13, 23, 33), characterized in that '' it includes the following stages:
- dig cavities in the form of rebates or grooves (4, 14, 24, 34, 44, 54) in the areas to be reinforced of the element;
- inserting into said cavities reinforcing plates (5, 15, 25, 35, 45, 55) pierced with holes (6, 26, 36, 46, 56);
- simultaneously filling said cavities (4, 14, 24, 34, 44, 54) and said holes (6, 26, 36, 46, 56) with a curable resin-based filling product so as to secure said plates to the element, said holes allowing better attachment of said plates to said product after hardening,
said reinforcing plates being sufficiently resistant and dimensioned to be able to restore or impart to said element the desired inertia after hardening. 2. Procédé de renforcement d'un élément selon la revendication 1, caractérisé en ce qu'il comprend en outre le remplacement d'une partie manquante (8, 18, 28, 38) dudit élément par un matériau de recharge.2. A method of reinforcing an element according to claim 1, characterized in that it further comprises replacing a missing part (8, 18, 28, 38) of said element with a refill material. 3. Procédé de renforcement d'un élément selon la revendication 1 ou la revendication 2, caractérisé en ce qu'il comprend en outre l'imprégnation de parties dégradées (3, 13, 23, 33) dudit élément par un produit à base résine fluide.3. A method of reinforcing an element according to claim 1 or claim 2, characterized in that it further comprises the impregnation of degraded parts (3, 13, 23, 33) of said element with a resin-based product. fluid. 4. Procédé de renforcement d'un élément selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites plaques de renforcement sont en acier, en métal, en bois ou en plastique rigide.4. A method of reinforcing an element according to any one of the preceding claims, characterized in that said reinforcing plates are made of steel, metal, wood or rigid plastic. 5. Procédé de renforcement d'un élément selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdites plaques de renforcement sont des plaques de métal déployé.5. A method of reinforcing an element according to any one of claims 1 to 3, characterized in that said reinforcing plates are plates of expanded metal. 6. Procédé de renforcement d'un élément selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites plaques de renforcement sont munies de chevilles de positionnement ou de solidarisation (16).6. A method of reinforcing an element according to any one of the preceding claims, characterized in that said reinforcing plates are provided with positioning or fixing pins (16). 7. Procédé de renforcement d'un élément selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites plaques de renforcement sont munies de talons d'appui (40).7. A method of reinforcing an element according to any one of the preceding claims, characterized in that said reinforcing plates are provided with bearing heels (40). 8. Procédé de renforcement d'un élément selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit produit à base de résine est un coulis de résine notamment époxydique.8. A method of reinforcing an element according to any one of the preceding claims, characterized in that said resin-based product is a resin grout, in particular an epoxy resin. 9. Procédé de renforcement d'un élément selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit produit de remplissage est un mortier de résine.9. A method of reinforcing an element according to any one of the preceding claims, characterized in that said filling product is a resin mortar.
EP87402468A 1986-11-04 1987-11-03 Reinforcement of supporting structure elements by inserting highly resistant plates Expired - Lifetime EP0269497B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8615333A FR2606057B1 (en) 1986-11-04 1986-11-04 REINFORCEMENT OF STRUCTURAL ELEMENTS BY INSERTING HIGH-STRENGTH PLATES
FR8615333 1986-11-04

Publications (2)

Publication Number Publication Date
EP0269497A1 true EP0269497A1 (en) 1988-06-01
EP0269497B1 EP0269497B1 (en) 1991-06-12

Family

ID=9340498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402468A Expired - Lifetime EP0269497B1 (en) 1986-11-04 1987-11-03 Reinforcement of supporting structure elements by inserting highly resistant plates

Country Status (4)

Country Link
EP (1) EP0269497B1 (en)
DE (1) DE3770774D1 (en)
ES (1) ES2025188B3 (en)
FR (1) FR2606057B1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0518246A2 (en) * 1991-06-14 1992-12-16 Berthold Fries Method for production of wooden hollow beams and forms of this beam obtained by this method
FR2691739A1 (en) * 1992-06-02 1993-12-03 Renofors France Repairing corrosion-deteriorated reinforced beam - by cutting away deteriorated portion and making perpendicular channel in beam to receive inverted T=shaped reinforcing elements, e.g. of fibre-reinforced compsn. material
FR2700805A1 (en) * 1993-01-27 1994-07-29 Ind Entreprise Process for reinforcing a damaged beam and beam thus obtained
EP0674060A1 (en) * 1994-03-04 1995-09-27 Wilhelm Modersohn GmbH &amp; Co KG Verankerungstechnik Reinforcement for masonry
WO1999004116A1 (en) * 1997-07-15 1999-01-28 Bilfinger + Berger Bauaktiengesellschaft Component
EP1437459A1 (en) * 2001-09-25 2004-07-14 Structural Quality Assurance, Inc. Reinforcement material and reinforcement structure of structure and method of designing reinforcement material
FR3044687A1 (en) * 2015-12-07 2017-06-09 M Lefevre METHOD FOR REINFORCING A BUILDING ELEMENT BY ASSEMBLING REINFORCING MODULES AND AT LEAST ONE PLATE CONNECTED TO THE REINFORCING MODULES
EP3591130A1 (en) 2018-07-04 2020-01-08 Klasch Spezial- Bauartikel GmbH Ceiling construction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728293A1 (en) * 1994-12-14 1996-06-21 Brochard Francois Xavier Reinforcement for timber frames of building

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2170498A5 (en) * 1971-12-20 1973-09-14 Bouweconomisch Technolog
DE2451639A1 (en) * 1974-10-30 1976-05-06 Hans Binker Increasing strength of woods and building materials - rods of glass fibre reinforced material inserted into cut notches
FR2400096A1 (en) * 1977-08-10 1979-03-09 Freyssinet Int Stup Reinforced concrete with steel plate bonded to tensile face - has perforated plate preventing trapping of air bubble in adhesive
GB2134965A (en) * 1983-01-24 1984-08-22 Dzus Fastener Europe Quarter turn fastener
GB2150969A (en) * 1983-12-06 1985-07-10 Dinardo And Partners Restoring and strengthening of timber components

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134956A (en) * 1983-02-10 1984-08-22 Rickards Timber Treatment Limi Upgrading or restoring a timber beam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2170498A5 (en) * 1971-12-20 1973-09-14 Bouweconomisch Technolog
DE2451639A1 (en) * 1974-10-30 1976-05-06 Hans Binker Increasing strength of woods and building materials - rods of glass fibre reinforced material inserted into cut notches
FR2400096A1 (en) * 1977-08-10 1979-03-09 Freyssinet Int Stup Reinforced concrete with steel plate bonded to tensile face - has perforated plate preventing trapping of air bubble in adhesive
GB2134965A (en) * 1983-01-24 1984-08-22 Dzus Fastener Europe Quarter turn fastener
GB2150969A (en) * 1983-12-06 1985-07-10 Dinardo And Partners Restoring and strengthening of timber components

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0518246A2 (en) * 1991-06-14 1992-12-16 Berthold Fries Method for production of wooden hollow beams and forms of this beam obtained by this method
EP0518246A3 (en) * 1991-06-14 1993-05-19 Berthold Fries Method for production of wooden hollow beams and forms of this beam obtained by this method
FR2691739A1 (en) * 1992-06-02 1993-12-03 Renofors France Repairing corrosion-deteriorated reinforced beam - by cutting away deteriorated portion and making perpendicular channel in beam to receive inverted T=shaped reinforcing elements, e.g. of fibre-reinforced compsn. material
FR2700805A1 (en) * 1993-01-27 1994-07-29 Ind Entreprise Process for reinforcing a damaged beam and beam thus obtained
EP0674060A1 (en) * 1994-03-04 1995-09-27 Wilhelm Modersohn GmbH &amp; Co KG Verankerungstechnik Reinforcement for masonry
WO1999004116A1 (en) * 1997-07-15 1999-01-28 Bilfinger + Berger Bauaktiengesellschaft Component
EP1437459A1 (en) * 2001-09-25 2004-07-14 Structural Quality Assurance, Inc. Reinforcement material and reinforcement structure of structure and method of designing reinforcement material
EP1437459A4 (en) * 2001-09-25 2005-07-06 Structural Quality Assurance I Reinforcement material and reinforcement structure of structure and method of designing reinforcement material
FR3044687A1 (en) * 2015-12-07 2017-06-09 M Lefevre METHOD FOR REINFORCING A BUILDING ELEMENT BY ASSEMBLING REINFORCING MODULES AND AT LEAST ONE PLATE CONNECTED TO THE REINFORCING MODULES
EP3591130A1 (en) 2018-07-04 2020-01-08 Klasch Spezial- Bauartikel GmbH Ceiling construction

Also Published As

Publication number Publication date
EP0269497B1 (en) 1991-06-12
FR2606057B1 (en) 1990-10-12
FR2606057A1 (en) 1988-05-06
ES2025188B3 (en) 1992-03-16
DE3770774D1 (en) 1991-07-18

Similar Documents

Publication Publication Date Title
US4644722A (en) Repairing utility poles
FR2611778A1 (en) FLOOR WITH COLLABORATION WOOD-CONCRETE
EP0269497B1 (en) Reinforcement of supporting structure elements by inserting highly resistant plates
FR2510163A1 (en) Reinforcing wooden beam - using resin concrete tied to beam top increasing design load
FR3009318A1 (en) METHOD OF BUILDING A WORK IN PREFABRICATED CONCRETE ELEMENTS AND ASSOCIATED WORK
FR3002956A1 (en) PRECONTRATED MOLDED WALL AND METHOD OF MAKING SUCH A WALL
CA2636921A1 (en) Process for reinforcing a building structure, and structure thus reinforced
EP0244890B1 (en) Process for producing hollow structures such as ducts, silos, or shelters, and structures obtained by this process
WO2010140277A1 (en) Woody material joint structure and joint member for use therein
EP2868829B1 (en) Method for reinforcing a timber construction element by assembling a reinforcement module placed under post-tension
EP0483158B1 (en) Anchoring and bedding method by using digging cross stays
JP6543010B1 (en) Bonding structure of wooden members
US3900541A (en) Method of restoring a wooden beam
EP2868841A1 (en) Method for reinforcing a timber construction element by a reinforcement module
JP2004092058A (en) Structure and method for joining composition member for building
FR2728293A1 (en) Reinforcement for timber frames of building
JP2009185549A (en) Method of reinforcing structural skeleton and structural skeleton
CA3029277A1 (en) Uhpc post - composite post
FR2760478A1 (en) BEAM-TYPE CONSTRUCTION ELEMENT
JP2021001450A (en) Wall balustrade reinforcement method and reinforcement structure
FR2596443A1 (en) METHOD FOR RESTORING A WOODEN STRUCTURE ELEMENT
EP2868828A1 (en) Method for reinforcing a construction element by assembling reinforcing modules and at least one termination element
EP3800304A1 (en) Reinforcing rod for a reinforced concrete structural element, assembly of structural elements, and method for manufacturing an assembly of structural elements
EP3800303A1 (en) Rod for attaching, assembly of structural and non-structural elements by means of such a rod, and method for manufacturing such an assembly
FR2892440A1 (en) Construction element e.g. brick masonry structure, reinforcing method, involves inserting grout with base of hydraulic cement and basalt after drilling inside element, where basalt is powdery or fibrous mixed with hydraulic cement

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES GB IT

17P Request for examination filed

Effective date: 19881130

17Q First examination report despatched

Effective date: 19900309

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19910612

REF Corresponds to:

Ref document number: 3770774

Country of ref document: DE

Date of ref document: 19910718

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2025188

Country of ref document: ES

Kind code of ref document: B3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19931116

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19931130

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19941102

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES

Effective date: 19941104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19941130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950104

Year of fee payment: 8

BERE Be: lapsed

Owner name: WOLF PHILIPPE

Effective date: 19941130

Owner name: ROBERT CLAUDE

Effective date: 19941130

Owner name: PACHET ANDRE

Effective date: 19941130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19951103

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19951103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960801

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20010402