EP0141782B1 - Method for the restoration of beams for giving them a higher resistance - Google Patents

Method for the restoration of beams for giving them a higher resistance Download PDF

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Publication number
EP0141782B1
EP0141782B1 EP84810503A EP84810503A EP0141782B1 EP 0141782 B1 EP0141782 B1 EP 0141782B1 EP 84810503 A EP84810503 A EP 84810503A EP 84810503 A EP84810503 A EP 84810503A EP 0141782 B1 EP0141782 B1 EP 0141782B1
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European Patent Office
Prior art keywords
rods
mortar
mass
process according
glass fibre
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German (de)
French (fr)
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EP0141782A3 (en
EP0141782A2 (en
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René Lacroix
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    • 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
    • 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

Definitions

  • the invention relates to a method for restoring beams according to the preamble of claim 1.
  • the reinforcement is obtained by the addition of reinforcements, generally metallic, as in the documents DE-A-25 31 656 or DE-C-547 576, or even by the prestressing of the beam, as indicated in the document PCT international application No. WO-82/03647.
  • the present invention presents a solution which satisfies both the technical requirements related to the reinforcement and the aesthetic requirements.
  • a considerable advantage of the present invention is that it can be applied under very difficult access conditions, which is generally the case.
  • the present invention makes it possible to take advantage of the deflection of the old beams while the known techniques simply ignore it or see their effectiveness reduced by the existence of it while modifying its original appearance.
  • a tongue (7) is removed and then a groove (8) is also produced, in which there is a metal bar (9) which will also be embedded in a mass of epoxy mortar (10).
  • a formwork (13) is then produced with wood of the same essence and the same age as that of the beam.
  • the formwork is adjusted so that the outside of the formwork is an extension of the beam.
  • a simple formwork (not shown) is produced at the top of the beam for the part of the mortar mass (6) which exceeds the upper surface of the beam.
  • the lower groove 8 is closed using the tongue (7).
  • Figure 2 is illustrated a variant intervening mainly in two types of situations. First when the core of the beam is reached and secondly when the removal of unhealthy wood requires amputating the beam on an entire section.
  • the replacement of the removed wood could be done only with resin or mortar poured either in the sound walls of the beam or in a formwork produced according to the example given in the first variant.
  • the price of the epoxy resin can dissuade the contractor from choosing the renovation solution in favor of outright replacement of the beam.
  • the second variant involves a new piece of dry wood (17) which partially occupies the space left free by the elimination of unhealthy wood.
  • the piece of dry wood is made integral by the glass fiber bars (15) which are then sealed on the one hand in healthy wood (Fig. 1 No 11) and on the other hand in the piece of dry wood (17).
  • the space between the beam (11) and the part (17) is then filled with mortar.
  • the formwork is produced as indicated in the first variant.
  • Glass fiber bars were placed vertically so that their upper end was anchored in the mortar mass comprising the 3 metal bars. These bars were divided into 19 pairs, the spaces separating each of the pairs being smaller around the supports than around the middle of the beam.
  • the overall inertia of the new resistant section represents an increase of 240% compared to the old one, (calculated as if the wood were not not reached).
  • the present invention has multiple advantages, first of all a substantial increase in resistance.
  • the very great adaptability of the process makes it possible to carry out each renovation taking into account the particularities of the species, access, condition of the old wood, importance, location and configuration of the areas where the old wood is no longer healthy, conservation of the aesthetic characteristics.
  • the present invention also finds its application when the old beam has a satisfactory static, but one wishes to reduce its modulus of elasticity to eliminate or attenuate vibrations for example.

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  • 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)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

1. Process for the restoration of wooden beams, employing reinforcing rods, epoxy resin and epoxy mortar, during which reinforcing rods are positioned longitudinally of the beam and other reinforcing rods are disposed substantially perpendicularly of the first rods, the various reinforcing rods being positioned in seatings previously drilled in the beam and made fast with the wood by injection or pouring of resin or epoxy mortar into the interior of the seatings, characterised in that at least one metallic reinforcing rod (3, 9) is positioned in the length direction of the beam and in that glass fibre rods (15, 16) are disposed in seatings drilled beforehand in the beam, the glass fibre rods being so positioned that at least one of their ends is free and in the vicinity of the metal rod (3, 9) and in that then, by injection or pouring, the metal rod (3, 9) and the ends of the glass fibre rods (15, 16) are coated in a mortar mass (6, 10, 12), the body of each of the glass fibre rods, in its seating, being made fast with the beam by the epoxy resin.

Description

L'invention concerne un procédé de restauration de poutres selon le préambule de la revendication 1.The invention relates to a method for restoring beams according to the preamble of claim 1.

La restauration des éléments de charpente de bâtiments anciens rencontre de multiples problèmes.The restoration of structural elements of old buildings faces multiple problems.

Chaque restauration apparaît pratiquement comme un cas unique de par l'importance relative et l'interdépendance des données particulières. Cependant, l'accroissement de la résistance à la charge et l'aspect esthétique du résultat sont des données quasi permanentes.Each restoration appears practically as a unique case due to the relative importance and the interdependence of the particular data. However, the increase in load resistance and the aesthetic appearance of the result are almost permanent data.

On connaît les techniques consistant à adjoin- dre à la poutre existante une nouvelle poutre destinée à soulager la première. Les deux poutres sont rendues solidaires par des tirants vissés de part en part ou encore par des barres pénétrant dans la poutre ancienne sans la traverser comme cela est décrit dans la demande de brevet européen n° 0 034 224.Techniques are known which consist in adding to the existing beam a new beam intended to relieve the first. The two beams are made integral by tie rods screwed right through or by bars penetrating into the old beam without crossing it as described in European patent application No. 0 034 224.

Ces deux techniques présentent des inconvénients importants lorsque la poutre ancienne a une flèche accusée. De plus leur mise en oeuvre est compromise lorsque l'espace libre au-dessus de la poutre ancienne est compté. Enfin, l'aspect original de la poutre n'est conservé que très exceptionnellement.These two techniques have significant drawbacks when the old beam has a sharp deflection. In addition, their implementation is compromised when the free space above the old beam is counted. Finally, the original appearance of the beam is only very rarely preserved.

Selon d'autres techniques, le renforcement est obtenu par l'adjonction d'armatures, en général métalliques, comme dans les documents DE-A-25 31 656 ou DE-C-547 576, ou encore par la mise en précontrainte de la poutre, tel que cela est indiqué dans le document PCT demande internationale n° WO-82/03647.According to other techniques, the reinforcement is obtained by the addition of reinforcements, generally metallic, as in the documents DE-A-25 31 656 or DE-C-547 576, or even by the prestressing of the beam, as indicated in the document PCT international application No. WO-82/03647.

D'autres techniques encore préconisent un renforcement fondé au moins partiellement sur l'utilisation de résine synthétique, en particulier la résine époxy comme cela est exposé dans les documents DE-B-24 51 639 et DE-C-22 61 820, ainsi que dans le document DE-A-31 33 014 où le mortier d'époxy est combiné avec des barres d'armature, selon le procédé suivant :

  • procédé de restauration de poutres en bois mettant en jeu des barres d'armature, de la résine époxy et du mortier d'époxy ; au cours duquel on place des barres d'armature dans le sens de la longueur de la poutre et l'on dispose d'autres barres d'armature sensiblement perpendiculaires aux premières, les diverses barres d'armature sont placées dans des logements préalablement percés dans la poutre et sont rendues solidaires du bois par injection ou coulage de résine ou de mortier d'epoxy à l'intérieur des logements (ce procédé constituant l'état de la technique de la présente invention).
Still other techniques recommend a reinforcement based at least partially on the use of synthetic resin, in particular epoxy resin as explained in documents DE-B-24 51 639 and DE-C-22 61 820, as well as in document DE-A-31 33 014 in which the epoxy mortar is combined with rebar, according to the following process:
  • method of restoring wooden beams using rebar, epoxy resin and epoxy mortar; during which reinforcing bars are placed in the lengthwise direction of the beam and other reinforcing bars are arranged substantially perpendicular to the first, the various reinforcing bars are placed in housings previously drilled in the beam and are made integral with the wood by injection or pouring of resin or epoxy mortar inside the housings (this process constituting the state of the art of the present invention).

Hormis les inconvénients d'ordre structurel des solutions connues, il convient de souligner l'extrême difficulté, voir l'impossibilité, d'appliquer ces solutions dans des cas concrets en raison du fait qu'elles supposent une liberté totale de manoeuvre aux abords de la poutre et qu'elles impliquent, pour certaines, la nécessité de déplacer la poutre de l'endroit qu'elle occupe. Ce grief ne s'applique pas à la solution proposée dans le document DE-C-22 61 820 qui, ne s'attachant qu'à la rénovation des extrémités de la poutre, n'intervient en rien dans l'accroissement de la résistance à la flexion et se soustrait aux contraintes y relatives.Apart from the structural disadvantages of the known solutions, it is worth emphasizing the extreme difficulty, or even the impossibility, of applying these solutions in concrete cases due to the fact that they imply total freedom of maneuver around the beam and that they imply, for some, the need to move the beam from the place it occupies. This complaint does not apply to the solution proposed in document DE-C-22 61 820 which, being concerned only with the renovation of the ends of the beam, does nothing to increase the resistance to flexion and evades the related constraints.

Au surplus, les techniques connues ne satisfont que très rarement l'impératif esthétique que la rénovation doit respecter par nature.In addition, known techniques only very rarely satisfy the aesthetic imperative that renovation must respect by nature.

La présente invention présente une solution qui satisfait à la fois les exigences techniques liées au renforcement et les exigences d'ordre esthétique. De plus, un avantage considérable de la présente invention est de pouvoir s'appliquer dans des conditions d'accès très difficiles ce qui est généralement le cas. En outre, la présente invention permet de tirer parti de la flèche des poutres anciennes alors que les techniques connues l'ignorent simplement ou voient leur efficacité réduite par l'existence de celle-ci tout en modifiant son aspect original.The present invention presents a solution which satisfies both the technical requirements related to the reinforcement and the aesthetic requirements. In addition, a considerable advantage of the present invention is that it can be applied under very difficult access conditions, which is generally the case. In addition, the present invention makes it possible to take advantage of the deflection of the old beams while the known techniques simply ignore it or see their effectiveness reduced by the existence of it while modifying its original appearance.

La solution selon l'invention est exposée dans la revendication 1. D'autres mesures préférentielles sont illustrées dans les revendications dépendantes.The solution according to the invention is set out in claim 1. Other preferential measures are illustrated in the dependent claims.

On va décrire ci-après à titre d'exemple une variante d'exécution en se fondant sur le dessin où :

  • la figure 1 montre une vue latérale partiellement dégagée de la poutre,
  • la figure 2 montre l'utilisation d'une pièce de bois sec dans une poutre évidée.
  • Selon la variante illustrée à la figure 1, la poutre (1) présente une flèche qui est proportionnellement exagérée sur le dessin afin de rendre celui-ci plus facilement compréhensible.
An alternative embodiment will be described below by way of example, based on the drawing in which:
  • FIG. 1 shows a partially cleared side view of the beam,
  • Figure 2 shows the use of a piece of dry wood in a hollow beam.
  • According to the variant illustrated in Figure 1, the beam (1) has an arrow which is proportionately exaggerated in the drawing in order to make it more easily understandable.

On pratique, à la surface supérieure de la poutre (1), une gorge (2) destinée à recevoir les barres métalliques (3, 4 et 5) ainsi qu'une partie de la masse de mortier d'époxy (6) ; on peut également utiliser des profilés.Is practiced, on the upper surface of the beam (1), a groove (2) intended to receive the metal bars (3, 4 and 5) as well as part of the mass of epoxy mortar (6); profiles can also be used.

Dans la face inférieure de la poutre, on prélève une languette (7) puis on réalise également une gorge (8) dans laquelle on dispose une barre métallique (9) qui sera noyée également dans une masse de mortier d'époxy (10).In the underside of the beam, a tongue (7) is removed and then a groove (8) is also produced, in which there is a metal bar (9) which will also be embedded in a mass of epoxy mortar (10).

On perce ensuite des trous dont l'orifice supérieur débouche dans la gorge supérieure et l'orifice inférieur dans la gorge inférieure. On place dans ces trous les barres de fibres de verre (16).Holes are then drilled, the upper opening of which opens into the upper groove and the lower opening into the lower groove. The glass fiber bars (16) are placed in these holes.

L'extrémité (11) de la poutre étant supposée atteinte, on la nettoie du bois non sain ce qui laisse un espace vacant (12).The end (11) of the beam being assumed to be reached, it is cleaned of unhealthy wood which leaves a vacant space (12).

On réalise ensuite un coffrage (13) avec du bois de même essence et même ancienneté que celui de la poutre. L'ajustement du coffrage se fait de sorte que l'extérieur du coffrage constitue le prolongement de la poutre. Afin de rendre cet ajustement aussi imperceptible que possible on peut, comme il est montré sur le dessin, réaliser une queue d'hirondelle (18).A formwork (13) is then produced with wood of the same essence and the same age as that of the beam. The formwork is adjusted so that the outside of the formwork is an extension of the beam. In order to make this adjustment as imperceptible as possible, we can, as shown in the drawing, carry out a swallow tail (18).

Dans la partie saine de la poutre (11) on perce des trous (14) dans lesquels on loge les barres de fibres de verre (15).In the healthy part of the beam (11) holes are drilled (14) in which the fiberglass bars (15) are housed.

On réalise un coffrage simple (non représenté) au haut de la poutre pour la partie de la masse de mortier (6) qui dépasse la surface supérieure de la poutre.A simple formwork (not shown) is produced at the top of the beam for the part of the mortar mass (6) which exceeds the upper surface of the beam.

Une fois les coffrages ajustés, et toutes les barres mises en place on referme la gorge inférieure 8 à l'aide de la languette (7).Once the formwork has been adjusted, and all the bars are in place, the lower groove 8 is closed using the tongue (7).

On peut alors injecter ou couler la résine époxy et le mortier d'époxy qui :

  • scellent la barre métallique inférieure (9) et la languette (7), ainsi que les extrémités inférieures des barres de fibres de verre (16),
  • scellent les barres de fibres de verre (16) dans le corps de la poutre (1),
  • comblent l'espace laissé vacant (12) et scellent le coffrage (13), les extrémités des barres métalliques (3 et 9) et des barres de fibres de verre (15),
  • scellent les barres métalliques (3, 4 et 5) et scellent également l'extrémité supérieure des barres de fibres de verre (16).
We can then inject or pour the epoxy resin and the epoxy mortar which:
  • seal the lower metal bar (9) and the tongue (7), as well as the lower ends of the glass fiber bars (16),
  • seal the fiberglass bars (16) in the body of the beam (1),
  • fill the space left vacant (12) and seal the formwork (13), the ends of the metal bars (3 and 9) and fiberglass bars (15),
  • seal the metal bars (3, 4 and 5) and also seal the upper end of the glass fiber bars (16).

On élimine ensuite le coffrage simple situé sur le sommet de la poutre et on lave les éventuelles bavures qui peuvent se produire le long de la languette (7) ou au raccord (18) de la poutre et du coffrage permanent.The simple formwork located on the top of the beam is then eliminated and any burrs which may occur along the tongue (7) or at the connection (18) of the beam and the permanent formwork are washed.

A la figure 2 est illustrée une variante intervenant principalement dans deux types de situations. Premièrement lorsque le coeur de la poutre est atteint et deuxièmement lorsque l'élimination du bois non sain oblige à amputer la poutre sur un tronçon entier.In Figure 2 is illustrated a variant intervening mainly in two types of situations. First when the core of the beam is reached and secondly when the removal of unhealthy wood requires amputating the beam on an entire section.

Dans ces deux cas, le remplacement du bois éliminé pourrait se faire uniquement avec de la résine ou du mortier coulé soit dans les Parois saines de la poutre soit dans un coffrage réalisé selon l'exemple donné dans la première variante. Cependant, le prix de la résine d'époxy peut dissuader l'entrepreneur de choisir la solution de la rénovation au profit du remplacement pur et simple de la poutre. Afin de pouvoir conserver au moins l'apparence extérieure originale grâce à la rénovation, la deuxième variante met en jeu une pièce neuve de bois sec (17) qui occupe partiellement l'espace laissé libre par l'élimination du bois non sain.In these two cases, the replacement of the removed wood could be done only with resin or mortar poured either in the sound walls of the beam or in a formwork produced according to the example given in the first variant. However, the price of the epoxy resin can dissuade the contractor from choosing the renovation solution in favor of outright replacement of the beam. In order to be able to maintain at least the original external appearance thanks to the renovation, the second variant involves a new piece of dry wood (17) which partially occupies the space left free by the elimination of unhealthy wood.

Dans le cas d'une poutre dont le coeur est attaqué, il sera possible d'insérer une poutre neuve (17) de même longueur mais de section plus faible. Pour renforcer immédiatement cette nouvelle poutre on peut pratiquer comme dans la première variante et disposer des barres métalliques (3 et 9) et des barres de fibres de verre (16). Une fois la pièce neuve (17) et les barres (3, 9 et 16) mises en place on coule une masse de mortier qui enrobe cet ensemble et le rend solidaire du reste de la poutre.In the case of a beam whose core is attacked, it will be possible to insert a new beam (17) of the same length but of smaller section. To immediately reinforce this new beam, you can practice as in the first variant and have metal bars (3 and 9) and fiberglass bars (16). Once the new part (17) and the bars (3, 9 and 16) put in place, a mass of mortar is poured which coats this assembly and makes it integral with the rest of the beam.

Dans le cas d'une poutre dont un tronçon a dû être supprimé, la pièce de bois sec est rendue solidaire par les barres de fibres de verre (15) qui sont alors scellées d'une part dans le bois sain (Fig. 1 No 11) et d'autre part dans la pièce de bois sec (17). L'espace entre la poutre (11) et la pièce (17) est ensuite comblé par du mortier. Le coffrage est réalisé comme indiqué dans la première variante. Ici encore, il est souhaitable de renforcer la poutre entière grâce aux barres de fibres de verre (16) et aux barres métalliques (3 et 9).In the case of a beam from which a section had to be removed, the piece of dry wood is made integral by the glass fiber bars (15) which are then sealed on the one hand in healthy wood (Fig. 1 No 11) and on the other hand in the piece of dry wood (17). The space between the beam (11) and the part (17) is then filled with mortar. The formwork is produced as indicated in the first variant. Here again, it is desirable to reinforce the entire beam using the fiberglass bars (16) and the metal bars (3 and 9).

Une poutre dont la section résistante originale était constituée de deux éléments en bois superposés ayant chacun une largeur de 24 cm et une hauteur de 38 cm (pour une portée de plus de 9 mètres) a été rénovée selon l'invention.A beam whose original resistant section consisted of two superimposed wooden elements each having a width of 24 cm and a height of 38 cm (for a span of more than 9 meters) was renovated according to the invention.

Sur la surface supérieure de la poutre, 3 barres métalliques de 24 mm de diamètre, ayant respectivement des longueurs de 10.20 m, 4.95 m et 2.60 m, ont été scellées dans un bloc de mortier d'époxy d'une section maximum de 20 cm par 11 cm de large au milieu de la poutre, décroissant progressivement pour atteindre 7 x 11 de large aux appuis.On the upper surface of the beam, 3 metal bars 24 mm in diameter, having lengths of 10.20 m, 4.95 m and 2.60 m respectively, were sealed in a block of epoxy mortar with a maximum section of 20 cm by 11 cm wide in the middle of the beam, gradually decreasing to reach 7 x 11 wide at the supports.

Des barres en fibres de verre ont été disposées verticalement de manière que leur extrémité supérieure soit ancrée dans la masse de mortier comprenant les 3 barres métalliques. Ces barres ont été réparties en 19 paires, les espaces séparant chacune des paires étant plus petits aux abords des appuis que vers le milieu de la poutre.Glass fiber bars were placed vertically so that their upper end was anchored in the mortar mass comprising the 3 metal bars. These bars were divided into 19 pairs, the spaces separating each of the pairs being smaller around the supports than around the middle of the beam.

L'inertie globale de la nouvelle section résistante, compte tenu des coefficients de sécurité prescrits par les normes (allemandes en l'espèce), représente une augmentation de 240 % par rapport à l'ancienne, (calculée comme si le bois n'était pas atteint).The overall inertia of the new resistant section, taking into account the safety coefficients prescribed by the standards (German in this case), represents an increase of 240% compared to the old one, (calculated as if the wood were not not reached).

Il va de soi que cette proportion ne peut être généralisée mais elle donne néanmoins une idée de ce que la solution, selon l'invention, peut apporter.It goes without saying that this proportion cannot be generalized, but it nevertheless gives an idea of what the solution according to the invention can provide.

La présente invention comporte de multiples avantages dont en premier lieu un accroissement substentiel de la résistance. La très grande adaptabilité du procédé permet de réaliser chaque rénovation en tenant compte des particularités de l'espèce, accès, état du bois ancien, importance, localisation et configuration des zones où le bois ancien n'est plus sain, conservation des caractéristiques esthétiques.The present invention has multiple advantages, first of all a substantial increase in resistance. The very great adaptability of the process makes it possible to carry out each renovation taking into account the particularities of the species, access, condition of the old wood, importance, location and configuration of the areas where the old wood is no longer healthy, conservation of the aesthetic characteristics.

La présente invention trouve également son application lorsque la poutre ancienne a une statique satisfaisante, mais qu'on désire réduire son module d'élasticité pour éliminer ou atténuer les vibrations par exemple.The present invention also finds its application when the old beam has a satisfactory static, but one wishes to reduce its modulus of elasticity to eliminate or attenuate vibrations for example.

Claims (12)

1. Process for the restoration of wooden beams, employing reinforcing rods, epoxy resin and epoxy mortar, during which reinforcing rods are positioned longitudinally of the beam and other reinforcing rods are disposed substantially perpendicularly of the first rods, the various reinforcing rods being positioned in seatings previously drilled in the beam and made fast with the wood by injection or pouring of resin or epoxy mortar into the interior of the seatings, characterised in that at least one metallic reinforcing rod (3, 9) is positioned in the length direction of the beam and in that glass fibre rods (15, 16) are disposed in seatings drilled beforehand in the beam, the glass fibre rods being so positioned that at least one of their ends is free and in the vicinity of the metal rod (3, 9) and in that then, by injection or pouring, the metal rod (3, 9) and the ends of the glass fibre rods (15, 16) are coated in a mortar mass (6, 10, 12), the body of each of the glass fibre rods, in its seating, being made fast with the beam by the epoxy resin.
2. Process according to claim 1, characterised in that the metal rod (3) is disposed above the beam (1) and in that the mortar mass (6) for covering this rod is poured on to the upper surface of the beam.
3. Process according to claim 1, characterised in that the mortar mass (6) containing a metal rod (3) is disposed, at least partially, in a channel (2) which has been formed beforehand in the upper part of the beam (1).
4. Process according to claim 3, characterised in that several metal rods or bars (3, 4, 5) of different lengths are placed in the mortar mass (6) in such manner that the middle of each of the rods or bars is situated at the level of the apex of the beam, the rods being disposed in decreasing order as regards length, one below the other, thereby at least partially filling the space created on the upper part of the beam because of the apex.
5. Process according to one of claims 1 to 4, characterised in that the unsound wood is removed from the ends (11) of the beam and that it is replaced by a mass of epoxy mortar (12), and in that this mass (12) and the mass covering the metal rod (6) are poured in or injected during a single operation, so that these two masses form only one and are united in a single body.
6. Process according to claim 5, characterised in that a permanent casing (13) of wood, of the same nature and of the same antiquity as the beam (1), is established, into which is poured the mortar mass intended for replacing the unsound wood.
7. Process according to one of claims 1 to 6, characterised in that a groove (8) is formed at the lower part of the beam (1), in which groove is placed a metal bar (9), which is thereafter embedded in a mass of resin or mortar (10).
8. Process according to claim 7, characterised in that, when forming the lower groove (8), a strip of wood (7) is removed, and in that this strip is replaced when the metal bar (9) has been positioned in the groove (8).
9. Process according to claim 7, characterised in that seatings (14) are drilled through the beam, these seatings having an orifice in the upper groove (2) and in the lower groove (8), and that glass fibre bars or rods (16) are so disposed in these seatings that their ends are close to the upper metal rods (3, 4, 5) and lower metal rods (9), and in that a mass of mortar (6 and 10) is poured in or injected, which mass at the same time covers the metal rods (3, 4, 5 and 9) and the ends of the glass rods (16), and which assures the connection of the glass fibre rods with the beam by filling the interstices between the seating (14) and the rod (16).
10. Process according to claim 1, characterised in that grooves or channels are formed in the walls of the beam by removal of strips and in that metal rods are disposed in these grooves, which rods, once the strips are in position, are covered by a quantity of epoxy resin or mortar by injection or pouring.
11. Process according to claim 1, characterised in that a part at least of the beam is removed and in that the said is replaced by a new piece of dry wood (17), of which the connection with the remainder of the beam (1) is effected, at least in part, with the glass fibre rods (15, 16), which are arranged in seatings (14) drilled at the time in the sound part of the beam and in the new part, and in that then the part (17) and the glass fibre rods (15,16) are embedded in a mass of epoxy mortar.
12. Process according to claim 1, characterised in that the centre at least of the beam is partially hollowed out from the top thereof and in that a new piece of dry wood is placed in the recess, the connection between the new piece (17) and the remainder of the beam (1) being then assured, at least in part, by pouring thereon a quantity of mortar or epoxy resin.
EP84810503A 1983-10-24 1984-10-15 Method for the restoration of beams for giving them a higher resistance Expired EP0141782B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84810503T ATE29547T1 (en) 1983-10-24 1984-10-15 PROCEDURES FOR THE RESTORATION OF CARRIERS AND INCREASING THEIR STRENGTH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5752/83 1983-10-24
CH5752/83A CH654060A5 (en) 1983-10-24 1983-10-24 Beams restoration process of wood for increased their resistance.

Publications (3)

Publication Number Publication Date
EP0141782A2 EP0141782A2 (en) 1985-05-15
EP0141782A3 EP0141782A3 (en) 1985-07-03
EP0141782B1 true EP0141782B1 (en) 1987-09-09

Family

ID=4298752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810503A Expired EP0141782B1 (en) 1983-10-24 1984-10-15 Method for the restoration of beams for giving them a higher resistance

Country Status (4)

Country Link
EP (1) EP0141782B1 (en)
AT (1) ATE29547T1 (en)
CH (1) CH654060A5 (en)
DE (1) DE3466031D1 (en)

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DE3828476A1 (en) * 1988-08-22 1990-03-08 Beta Loempel Buese Gmbh Process for increasing the load-bearing capacity
US8458969B2 (en) 2008-01-21 2013-06-11 Cfs Concrete Forming Systems Inc. Stay-in-place form systems for form-work edges, windows and other building openings
US8458985B2 (en) 2007-04-02 2013-06-11 Cfs Concrete Forming Systems Inc. Fastener-receiving components for use in concrete structures
US8555590B2 (en) 2007-11-09 2013-10-15 Cfs Concrete Forming Systems Inc. Pivotally activated connector components for form-work systems and methods for use of same
US8793953B2 (en) 2009-02-18 2014-08-05 Cfs Concrete Forming Systems Inc. Clip-on connection system for stay-in-place form-work
US8943774B2 (en) 2009-04-27 2015-02-03 Cfs Concrete Forming Systems Inc. Methods and apparatus for restoring, repairing, reinforcing and/or protecting structures using concrete
US9206614B2 (en) 2011-11-24 2015-12-08 Cfs Concrete Forming Systems Inc. Stay-in-place formwork with engaging and abutting connections
US9273479B2 (en) 2009-01-07 2016-03-01 Cfs Concrete Forming Systems Inc. Methods and apparatus for restoring, repairing, reinforcing and/or protecting structures using concrete
US9315987B2 (en) 2012-01-05 2016-04-19 Cfs Concrete Forming Systems Inc. Systems for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures with locatable stand-off components
US9441365B2 (en) 2011-11-24 2016-09-13 Cfs Concrete Forming Systems Inc. Stay-in-place formwork with anti-deformation panels
US9453345B2 (en) 2012-01-05 2016-09-27 Cfs Concrete Forming Systems Inc. Panel-to-panel connections for stay-in-place liners used to repair structures
US11674322B2 (en) 2019-02-08 2023-06-13 Cfs Concrete Forming Systems Inc. Retainers for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures
US11821204B2 (en) 2017-04-03 2023-11-21 Cfs Concrete Forming Systems Inc. Longspan stay-in-place liners

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FR2585393B1 (en) * 1985-07-29 1988-03-25 Renofors France BEAM OR OTHER STRUCTURAL ELEMENT IN WOOD REINFORCED BY A REINFORCEMENT, AND METHOD FOR THE PRODUCTION THEREOF
DE9006844U1 (en) * 1990-06-19 1990-08-30 Ursus Immobilien- und Verwaltungsgesellschaft mbH, 5902 Netphen Construction element made of a wooden stick
GB2299828B (en) * 1995-04-12 1998-08-12 Rotafix Construction and repair of timber components
FR2792355B1 (en) * 1999-04-16 2007-10-12 Lefevre Sa M METHOD FOR REINFORCING A BUILDING ELEMENT
FR2871089B1 (en) * 2004-06-02 2006-12-29 Christian Plee METHOD FOR REINFORCING AND / OR REPAIRING A STRUCTURE FOR REINFORCING
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US10151119B2 (en) 2012-01-05 2018-12-11 Cfs Concrete Forming Systems Inc. Tool for making panel-to-panel connections for stay-in-place liners used to repair structures and methods for using same
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DE1759680A1 (en) * 1965-03-19 1971-06-16 Rehm Gallus Procedure for the subsequent reinforcement of prestressed concrete ceiling beams whose reinforcement is damaged
DE2510262A1 (en) * 1975-03-08 1976-09-09 Hans Binker Strength improvement for timber beams - uses fibre bundles and webbing embedded in grooves along longitudinal faces
GB2060044B (en) * 1979-10-05 1983-05-25 Rickards Timber Treatment Ltd Beam restoration
FR2510163B1 (en) * 1981-07-22 1986-05-02 Renofors France METHOD FOR REINFORCING A WOODEN BEAM
DE3133014C2 (en) * 1981-08-20 1985-03-21 Lömpel-Bautenschutz GmbH + Co KG, 8725 Arnstein Procedure for restoration of wooden beams

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DE3828476C2 (en) * 1988-08-22 1998-12-10 Beta Loempel Buese Gmbh Procedure for increasing or restoring the load capacity
DE3828476A1 (en) * 1988-08-22 1990-03-08 Beta Loempel Buese Gmbh Process for increasing the load-bearing capacity
US8844241B2 (en) 2007-04-02 2014-09-30 Cfs Concrete Forming Systems Inc. Methods and apparatus for providing linings on concrete structures
US8458985B2 (en) 2007-04-02 2013-06-11 Cfs Concrete Forming Systems Inc. Fastener-receiving components for use in concrete structures
US9080337B2 (en) 2007-11-09 2015-07-14 Cfs Concrete Forming Systems Inc. Connector components for form-work systems and methods for use of same
US8555590B2 (en) 2007-11-09 2013-10-15 Cfs Concrete Forming Systems Inc. Pivotally activated connector components for form-work systems and methods for use of same
US8458969B2 (en) 2008-01-21 2013-06-11 Cfs Concrete Forming Systems Inc. Stay-in-place form systems for form-work edges, windows and other building openings
US9273479B2 (en) 2009-01-07 2016-03-01 Cfs Concrete Forming Systems Inc. Methods and apparatus for restoring, repairing, reinforcing and/or protecting structures using concrete
US9359780B2 (en) 2009-01-07 2016-06-07 Cfs Concrete Forming Systems Inc. Methods and apparatus for restoring, repairing, reinforcing and/or protecting structures using concrete
US9273477B2 (en) 2009-02-18 2016-03-01 Cfs Concrete Forming Systems Inc. Clip-on connection system for stay-in-place form-work
US8793953B2 (en) 2009-02-18 2014-08-05 Cfs Concrete Forming Systems Inc. Clip-on connection system for stay-in-place form-work
US8943774B2 (en) 2009-04-27 2015-02-03 Cfs Concrete Forming Systems Inc. Methods and apparatus for restoring, repairing, reinforcing and/or protecting structures using concrete
US9206614B2 (en) 2011-11-24 2015-12-08 Cfs Concrete Forming Systems Inc. Stay-in-place formwork with engaging and abutting connections
US9441365B2 (en) 2011-11-24 2016-09-13 Cfs Concrete Forming Systems Inc. Stay-in-place formwork with anti-deformation panels
US9315987B2 (en) 2012-01-05 2016-04-19 Cfs Concrete Forming Systems Inc. Systems for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures with locatable stand-off components
US9453345B2 (en) 2012-01-05 2016-09-27 Cfs Concrete Forming Systems Inc. Panel-to-panel connections for stay-in-place liners used to repair structures
US11821204B2 (en) 2017-04-03 2023-11-21 Cfs Concrete Forming Systems Inc. Longspan stay-in-place liners
US11674322B2 (en) 2019-02-08 2023-06-13 Cfs Concrete Forming Systems Inc. Retainers for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures

Also Published As

Publication number Publication date
EP0141782A3 (en) 1985-07-03
CH654060A5 (en) 1986-01-31
EP0141782A2 (en) 1985-05-15
DE3466031D1 (en) 1987-10-15
ATE29547T1 (en) 1987-09-15

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