WO1987002301A1 - Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby - Google Patents

Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby Download PDF

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Publication number
WO1987002301A1
WO1987002301A1 PCT/BE1985/000017 BE8500017W WO8702301A1 WO 1987002301 A1 WO1987002301 A1 WO 1987002301A1 BE 8500017 W BE8500017 W BE 8500017W WO 8702301 A1 WO8702301 A1 WO 8702301A1
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WO
WIPO (PCT)
Prior art keywords
fibers
cement
mandrel
continuous fibers
continuous
Prior art date
Application number
PCT/BE1985/000017
Other languages
French (fr)
Inventor
Alexandre Graevenitz
Original Assignee
Alexandre Graevenitz
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
Priority to LU85372A priority Critical patent/LU85372A1/en
Application filed by Alexandre Graevenitz filed Critical Alexandre Graevenitz
Priority to PCT/BE1985/000017 priority patent/WO1987002301A1/en
Priority to EP19850905197 priority patent/EP0252072A1/en
Priority to IN105/DEL/87A priority patent/IN170446B/en
Publication of WO1987002301A1 publication Critical patent/WO1987002301A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
    • B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
    • B28B21/62—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements circumferential laterally tensioned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0006—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects the reinforcement consisting of aligned, non-metal reinforcing elements

Definitions

  • the present invention relates to a method of manufacturing hollow bodies of reinforced concrete by continuous fibers, for example glass fibers, in particular pipes, silos or housing modules with a relatively thin wall; it also relates to a device for implementing said method.
  • a process is known for manufacturing hollow bodies made of glass fiber reinforced concrete in which chopped glass fibers and cement mortar are simultaneously sprayed into a mold, after which it is carried out
  • the use of continuous fibers gives better mechanical properties to the material than the use of chopped fibers projected at random.
  • the continuous fiber has not yet been used as a reinforcement in concrete, since the impregnation of the fibers is not sufficient and that a glass content cannot be exceeded.
  • the object of the present invention is therefore to provide a method for manufacturing hollow bodies of reinforced concrete by continuous fibers, in particular a concrete consisting of a mixture of cement, silica sand and water, which has mechanical characteristics improved and a fiber content of up to more than 10% by weight.
  • the present invention also aims to provide a device for implementing the process .
  • the object of the present invention is achieved by a process for manufacturing hollow bodies of concrete reinforced with continuous fibers, characterized in that the continuous fibers are impregnated with water; in that the continuous fibers are passed through a cement milk of adequate concentration; in that the continuous fibers, under tension, previously treated, are wound in at least one layer, on a layer previously projected on a mandrel, consisting of a mixture of cement and chopped fibers, the concrete having been prepared for starting from a siliceous material having a fine sorted granuloma; and in that the composite product thus obtained is at least partially cured before removing it from said mandrel.
  • the granuloma sorts the silicon matter used in concrete is between 0.2 and 1.5 mm.
  • the concrete is prepared with an excess amount of water.
  • the water previously impregnated with the continuous glass fibers contains a wetting agent. It is thus possible to improve the adhesion of the fibers to the cement.
  • the winding energization of continuous glass fibers on the coated mandrel with a layer of cement granuloma very fine sorts and prepared with an excess of water has the effect of exerting pressure thereon and amé ⁇ further improve their impregnation.
  • the continuous fibers wound under tension crush the cement reinforced with short fibers, which covers the mandrel and compresses the short fibers which sink into the mass. In this way, they express a part of the concrete which rises, through the fibers, towards the surface by drowning the whole in the mass of the cement.
  • the chopped fibers arranged in any way prevent the continuous fibers from completely crossing the mass of the ci ⁇ ment and that they create transverse links between the substantially parallel continuous fibers, while improving the mechanical characteristics of the composite product.
  • the winding under tension also causes a stress which is fixed during hardening and which plays fully after demolding.
  • a device for implementing the method described above characterized in that it comprises at least two tanks for successive impe ⁇ gnation baths of the fibers continuous, said tanks being able to move in a direction parallel to the axis of the mandrel; a tilting arm provided with a device for projecting the mixture of cement and chopped fibers onto the mandrel and allowing the continuous fibers to be applied beforehand: impregnated, under tension, onto the mandrel coated with the cement, said tilting arm being arranged in such a way that it allows the winding of the bare fibers in the manner of a coil around the mandrel which is rotated at an adequate speed.
  • the device according to the invention comprises three tanks for successive impregnation baths, that is to say the water possibly containing a wetting agent, and the cement milk; said vats pou ⁇ vant to move in a direction parallel to the axis of the mandrel as a function of the position of the rocking arm which applies the continuous fibers under tension on the mandrel previously coated with cement.
  • the present invention also aims to provide a hollow body with a thin wall, characterized in that it consists of a prestressed concrete reinforced with fibers, said concrete consisting of a siliceous material having a fine sorted granuloma, preferably between 0.2 and 1.5 mm and having a fiber content of up to more than 10% by weight of the final product obtained.
  • 5% by weight of chopped fibers sprayed simultaneously with the cement is used and up to 5% by weight of continuous wound fibers.
  • the performance will increase even more rapidly, since the reinforcement by continuous fibers is even more efficient than the reinforcement by staple fibers. ie chopped, and therefore, one can possibly reduce the content of chopped fibers, while having superior technical performance.
  • the method according to the invention provides a product having a fiber content of up to 10% by weight and more.
  • the product obtained consists of concrete reinforced with alternating layers of staple fibers and continuous fibers until the thickness required for the performance required is obtained.
  • the device of the invention comprises a mandrel 1 which serves as a molding support for the hollow body (shown in FIG. 2), and a device for winding continuous glass fibers on a layer of concrete made up of cement with a particle size between 0.2 and 1.5 mm and chopped fibers.
  • This device comprises a means for unwinding the continuous glass fibers 2 and three tanks for the successive impregnation baths of the fibers, namely a tank 3 containing water added with a wetting agent, a tank 4 containing water and a 5 tank a milk or a cement mortar. These tanks can move in a direction parallel to the axis of the man ⁇ drin, that is to say an axis perpendicular to the plane of the sheet.
  • the various tanks are followed by a tensioning device 6 for the continuous fibers which are thus brought towards the rocking arm 8 which must be able to adapt to all the positions of the mandrel 1 and which must also allow the continuous fibers to be wound up at the way of a coil.
  • Said rocking arm 8 comprises a projection device 10 which projects the mixture formed by the cement and the chopped glass fibers onto the mandrel 1.
  • the arm 8 is also equipped with a device 12 for applying under tension the continuous fibers on the layer of cement previously projected on the mandrel.
  • the thin-walled hollow body is a construction module which, assembled with other similar modules, can form a prefabricated dwelling.

Abstract

Continuous fibres are passed into a cement grout and are tension-wound into at least one layer on a layer previously projected on to a mandrel, and comprised of a mixture of cement and short fibres. Thereafter, an appropriate drying time is provided to allow the hollow body to dry. The device comprises three vats (3, 4, 5) which are displaceable in a direction parallel to the axis of the rotary mandrel (1) and a pivoting arm (8) provided with a projection device (10) for projecting the mixture of short fibres and cement as well as means (12) for applying the tensioned continuous fibres.

Description

Procédé et dispositif de fabrication de corps creux en béton armé par fibres continues et produits obtenus. Method and device for manufacturing hollow bodies of reinforced concrete by continuous fibers and products obtained.
La présente invention concerne un procédé de fabrication de corps creux en béton armé par fibres con¬ tinues, par exemple des fibres de verre, notamment des tuyaux, des silos ou des modules d'habitation à paroi re¬ lativement- mince ; elle concerne également un dispositif pour la mise en oeuvre dudit procédé. On connaît un procédé de fabrication de corps creux en béton armé par fibres de verre dans lequel on projette simultanément des fibres de verre hachées et du mortier de ciment dans un moule, après quoi on effectue
Figure imgf000003_0001
II est également connu, notamment par la tech¬ nique des matières plastiques ,que l'utilisation de fibres continues confère de- meilleures propriétés mécaniques au matériau que l'utilisation de fibres hachées projetées au hasard. II s'est cependant avéré que la fibre continue n'a pas encore été utilisée comme armature dans le béton, étant donné que l'imprégnation des fibres n'est pas suf¬ fisante et qu'on ne peut dépasser une teneur en verre su¬ périeure à 5 % en poids du produit composite obtenu. II existe donc le besoin de fournir un béton armé par fibres de verre continues, ayant une teneur en fibres même supérieure à 5 % en poids et présentant des caractéristiques mécaniques améliorées par rapport aux bétons armés par fibres connus jusqu'à présent. Le but de la présente invention vise par consé¬ quent à fournir un procédé de fabrication de corps creux en béton armé par fibres continues, notamment un béton constitué par un mélange de ciment, de sable siliceux et d'eau, qui présente des caractéristiques mécaniques amé- liorées et une teneur en fibres allant jusqu'à plus de 10 % en poids .The present invention relates to a method of manufacturing hollow bodies of reinforced concrete by continuous fibers, for example glass fibers, in particular pipes, silos or housing modules with a relatively thin wall; it also relates to a device for implementing said method. A process is known for manufacturing hollow bodies made of glass fiber reinforced concrete in which chopped glass fibers and cement mortar are simultaneously sprayed into a mold, after which it is carried out
Figure imgf000003_0001
It is also known, in particular from the plastics technology, that the use of continuous fibers gives better mechanical properties to the material than the use of chopped fibers projected at random. However, it turned out that the continuous fiber has not yet been used as a reinforcement in concrete, since the impregnation of the fibers is not sufficient and that a glass content cannot be exceeded. ¬ less than 5% by weight of the composite product obtained. There is therefore a need to provide concrete reinforced by continuous glass fibers, having a fiber content even greater than 5% by weight and having improved mechanical characteristics compared to concrete reinforced by fibers known up to now. The object of the present invention is therefore to provide a method for manufacturing hollow bodies of reinforced concrete by continuous fibers, in particular a concrete consisting of a mixture of cement, silica sand and water, which has mechanical characteristics improved and a fiber content of up to more than 10% by weight.
Par ailleurs, la présente invention vise égale¬ ment à fournir un dispositif pour la mise en oeuvre du procédé .Furthermore, the present invention also aims to provide a device for implementing the process .
Le but de la présente invention est atteint par un procédé de fabrication de corps creux en béton armé par des fibres continues caractérisé en ce qu'on imprègne préalablement les fibres continues avec de l' eau ; en ce qu'on fait passer les fibres continues dans un lait de ciment de concentration adéquate; en ce qu'on enroule les fibres continues, sous tension, préalablement traitées, en au moins une couche, sur une couche préalablement pro- jetée sur un mandrin, constitué par un mélange de ciment et de fibres hachées, le béton ayant été préparé à partir d'une matière siliceuse ayant une granulome trie fine ; et en ce qu'on fait durcir au moins partiellement le produit composite ainsi obtenu avant de le retirer dudit mandrin. Avantageuselement , la granulome trie de la ma¬ tière silicieuse utilisée dans le béton est comprise en¬ tre 0,2 et 1 ,5 mm.The object of the present invention is achieved by a process for manufacturing hollow bodies of concrete reinforced with continuous fibers, characterized in that the continuous fibers are impregnated with water; in that the continuous fibers are passed through a cement milk of adequate concentration; in that the continuous fibers, under tension, previously treated, are wound in at least one layer, on a layer previously projected on a mandrel, consisting of a mixture of cement and chopped fibers, the concrete having been prepared for starting from a siliceous material having a fine sorted granuloma; and in that the composite product thus obtained is at least partially cured before removing it from said mandrel. Advantageously, the granuloma sorts the silicon matter used in concrete is between 0.2 and 1.5 mm.
Selon une forme d'exécution préférée, le béton est préparé avec une quantité d'eau en excès. De préférence, l'eau d'imprégnation préalable des fibres continues de verre contient un agent mouil¬ lant. On peut ainsi améliorer l'adhérence des fibres au ciment .According to a preferred embodiment, the concrete is prepared with an excess amount of water. Preferably, the water previously impregnated with the continuous glass fibers contains a wetting agent. It is thus possible to improve the adhesion of the fibers to the cement.
L'enroulement sous tension des fibres de verre continues sur le mandrin enrobé d'une couche de ciment à granulome trie très fine et préparé avec un 'excès d'eau a pour effet d'exercer une pression sur celui-ci et d'amé¬ liorer encore leur imprégnation. Par ailleurs, les fibres continues enroulées sous tension écrasent le ciment ren- forcé par fibres courtes , qui recouvre le mandrin et com¬ priment les fibres courtes qui s'enfoncent dans la masse. De cette manière, elles expriment une partie du béton qui remonte, à travers les fibres, vers la surface en noyant le tout dans la masse du ciment. Il faut noter que les fibres hachées disposées de manière quelconque empêchent les fi¬ bres continues de traverser complètement la masse du ci¬ ment et qu'elles créent des liens transversaux entre les fibres continues sensiblement parallèles, tout en amélio- rant les caractéristiques mécaniques du produit composi¬ te. L'enroulement sous tension provoque également une contrainte qui est fixée pendant le durcissement et qui joue pleinement après le démoulage. Selon un autre aspect de la présente invention, celle-ci concerne également un dispositif pour la mise en oeuvre du procédé décrit ci-dessus, caractérisé en ce qu ' il comporte au moins deux cuves pour les bains d'impré¬ gnation successifs des fibres continues, lesdites cuves pouvant se déplacer selon une direction parallèle à l'axe du mandrin ; un bras basculant muni d'un dispositif de projection du mélange de ciment et de fibres hachées sur le mandrin el permettant d'appliquer les fibres continues préalablement: imprégnées, sous tension, sur le mandrin en- robe du ciment, ledit bras basculant étant agencé de ma¬ nière telle qu'il permet l'enroulement des fibres conti¬ nues à la manière d'une bobine autour du mandrin qui est entraîné en rotation à vitesse adéquate.The winding energization of continuous glass fibers on the coated mandrel with a layer of cement granuloma very fine sorts and prepared with an excess of water has the effect of exerting pressure thereon and amé ¬ further improve their impregnation. Furthermore, the continuous fibers wound under tension crush the cement reinforced with short fibers, which covers the mandrel and compresses the short fibers which sink into the mass. In this way, they express a part of the concrete which rises, through the fibers, towards the surface by drowning the whole in the mass of the cement. It should be noted that the chopped fibers arranged in any way prevent the continuous fibers from completely crossing the mass of the ci¬ ment and that they create transverse links between the substantially parallel continuous fibers, while improving the mechanical characteristics of the composite product. The winding under tension also causes a stress which is fixed during hardening and which plays fully after demolding. According to another aspect of the present invention, it also relates to a device for implementing the method described above, characterized in that it comprises at least two tanks for successive impré¬ gnation baths of the fibers continuous, said tanks being able to move in a direction parallel to the axis of the mandrel; a tilting arm provided with a device for projecting the mixture of cement and chopped fibers onto the mandrel and allowing the continuous fibers to be applied beforehand: impregnated, under tension, onto the mandrel coated with the cement, said tilting arm being arranged in such a way that it allows the winding of the bare fibers in the manner of a coil around the mandrel which is rotated at an adequate speed.
De préf érence , le dispositif suivant l'invention comporte trois cuves pour les bains d'imprégnation suc¬ cessifs, c'est-à-dire l'eau contenant éventuellement un agent mouillant, et le lait de ciment ; lesdites cuves pou¬ vant se déplacer selon une direction parallèle à l'axe du mandrin en fonction de la position du bras basculant qui applique les fibres continues sous tension sur lé mandrin préalablement enrobé de ciment.Preferably, the device according to the invention comprises three tanks for successive impregnation baths, that is to say the water possibly containing a wetting agent, and the cement milk; said vats pou¬ vant to move in a direction parallel to the axis of the mandrel as a function of the position of the rocking arm which applies the continuous fibers under tension on the mandrel previously coated with cement.
La présente invention vise également à fournir un corps creux à paroi mince , caractérisé en ce qu'il con¬ siste en un béton précontraint armé par des fibres, ledit béton étant constitué par une matière siliceuse ayant une granulome trie fine, de préférence comprise entre 0,2 et 1,5 mm et présentant une teneur en fibres allant jusqu'à plus de 10 % en poids du produit final obtenu.The present invention also aims to provide a hollow body with a thin wall, characterized in that it consists of a prestressed concrete reinforced with fibers, said concrete consisting of a siliceous material having a fine sorted granuloma, preferably between 0.2 and 1.5 mm and having a fiber content of up to more than 10% by weight of the final product obtained.
De préférence, on utilise 5 % en poids de fi- bres hachées projetées simultanément avec le ciment et jusqu'à 5 % en poids de fibres continues enroulées. Ces valeurs ne sont toutefois pas limitatives et dépendent entre autre des sollicitations auxquelles sera soumis le produit obtenu.Preferably, 5% by weight of chopped fibers sprayed simultaneously with the cement is used and up to 5% by weight of continuous wound fibers. These values are not, however, limiting and depend, among other things, on the stresses to which the product obtained.
Si l'on augmente ainsi la teneur en fibres, grâce au procédé de l'invention, les performances vont augmenter encore plus rapidement, étant donné que le ren¬ forcement par fibres continues est encore plus performant que le renforcement par fibres discontinues c'est-à-dire hachées, et de ce fait, on peut éventuellement réduire la teneur en fibres hachées , tout en ayant des performances techniques supérieures.If the fiber content is thus increased, thanks to the process of the invention, the performance will increase even more rapidly, since the reinforcement by continuous fibers is even more efficient than the reinforcement by staple fibers. ie chopped, and therefore, one can possibly reduce the content of chopped fibers, while having superior technical performance.
Alors que, selon les procédés classiques, on n' arrive pas à dépasser une teneur en fibres supérieure à 5Whereas, according to conventional methods, it is not possible to exceed a fiber content greater than 5
% en poids, le procédé selon l'invention fournit un pro¬ duit ayant une teneur en fibres allant jusqu'à 10 % en poids et plus .% by weight, the method according to the invention provides a product having a fiber content of up to 10% by weight and more.
Selon une forme d'exécution particulièrement préférée, le produit obtenu consiste en un béton armé par des couches alternées de fibres discontinues et de fibres continues jusqu'à l'obtention de l'épaisseur requise pour les performances demandées.According to a particularly preferred embodiment, the product obtained consists of concrete reinforced with alternating layers of staple fibers and continuous fibers until the thickness required for the performance required is obtained.
D'autres détails et avantages apparaîtront plus clairement à la lecture de la description d'une forme d' exécution préférée décrite ci-dessous à l'appui des figu¬ res annexées dans lesquelles :Other details and advantages will appear more clearly on reading the description of a preferred embodiment described below in support of the appended figures in which:
- la figure 1 est une vue schématique d'une forme d'exé¬ cution d'un dispositif selon la présente invention ; et - la figure 2 est un exemple de produit obtenu selon le procédé de la présente invention. u En référence aux figures, le dispositif de l'in¬ vention comporte un mandrin 1 qui sert de support de mou¬ lage pour le corps creux (représenté à la figure 2) , et un dispositif d'enroulement de fibres de verre continues sur une couche de béton constituée par un ciment à granu- lométrie comprise entre 0,2 et 1,5 mm et par des fibres hachées. Ce dispositif comporte un moyen de déroulement des fibres de verre continues 2 et trois cuves pour les bains d'imprégnation successifs des fibres, à savoir une cuve 3 contenant de l'eau additionnée d'un agent mouil¬ lant, une cuve 4 contenant de l'eau et une cuve 5 conte- nant un lait ou un mortier de ciment. Ces cuves peuvent se déplacer selon une direction parallèle à l'axe du man¬ drin c'est-à-dire un axe perpendiculaire au plan de la feuille. Les diverses cuves sont suivies d'un dispositif de tension 6 des fibres continues qui sont ainsi amenées vers le bras basculant 8 qui doit pouvoir s'adapter à toutes les positions du mandrin 1 et qui doit en outre permettre un enroulement des fibres continues à la maniè¬ re d'une bobine. Ledit bras basculant 8 comporte un dis- positif de projection 10 qui projette le mélange consti¬ tué par le ciment et les fibres de verre hachées sur le mandrin 1. Le bras 8 est également équipé d'un dispositif 12 d'application sous tension des fibres continues sur la couche de ciment préalablement projetée sur le mandrin. A titre d'exemple on a représenté, à la figure- Figure 1 is a schematic view of a form of execution of a device according to the present invention; and - Figure 2 is an example of a product obtained according to the method of the present invention. u With reference to the figures, the device of the invention comprises a mandrel 1 which serves as a molding support for the hollow body (shown in FIG. 2), and a device for winding continuous glass fibers on a layer of concrete made up of cement with a particle size between 0.2 and 1.5 mm and chopped fibers. This device comprises a means for unwinding the continuous glass fibers 2 and three tanks for the successive impregnation baths of the fibers, namely a tank 3 containing water added with a wetting agent, a tank 4 containing water and a 5 tank a milk or a cement mortar. These tanks can move in a direction parallel to the axis of the man¬ drin, that is to say an axis perpendicular to the plane of the sheet. The various tanks are followed by a tensioning device 6 for the continuous fibers which are thus brought towards the rocking arm 8 which must be able to adapt to all the positions of the mandrel 1 and which must also allow the continuous fibers to be wound up at the way of a coil. Said rocking arm 8 comprises a projection device 10 which projects the mixture formed by the cement and the chopped glass fibers onto the mandrel 1. The arm 8 is also equipped with a device 12 for applying under tension the continuous fibers on the layer of cement previously projected on the mandrel. By way of example, FIG.
2, un produit composite obtenu selon le procédé de l'in¬ vention et à l'aide du dispositif de l'invention. Dans ce cas le corps creux à paroi mince est un module de cons¬ truction qui, assemblé avec d'autres modules semblables, peut former une habitation préfabriquée .On peut cependant également fabriquer de cette manière, avec un mandrin adé¬ quat, des tuyauteries en béton précontraint renforcé par fibres de vet re ou encore d'autres corps creux à parois relativement minces. 2, a composite product obtained according to the method of the invention and using the device of the invention. In this case, the thin-walled hollow body is a construction module which, assembled with other similar modules, can form a prefabricated dwelling. However, it is also possible to manufacture pipes in this manner, with an adé¬ mandrel. in prestressed concrete reinforced with vet re fibers or other hollow bodies with relatively thin walls.

Claims

REVENDICATIONS 1. Procédé pour la fabrication de corps creux en béton armé par des fibres continues caractérisé en ce qu'on imprègne préalablement les fibres continues avec de l'eau ; en ce qu'on fait passer, les fibres continues dans un lait de ciment de concentration adéquate; en ce qu'on enroule les fibres continues préalablement traitées, sous tension, en au moins une couche, sur une couche préala¬ blement projetée sur un mandrin et constituée par un mé- lange de ciment et de fibres hachées, le béton ayant été préparé à partir d'une matière siliceuse ayant une granu- lométrie fine. ; et en ce qu'on fait durcir au moins par¬ tiellement le produit composite ainsi obtenu avant de le retirer dudit mandrin.. 2. Procédé suivant la revendication 1 caracté¬ risé en ce que la granulometrie de la matière silicieuse utilisée dans le mortier de ciment est comprise entre 0,CLAIMS 1. Process for the production of hollow concrete bodies reinforced with continuous fibers, characterized in that the continuous fibers are impregnated with water; in that we pass, the continuous fibers in a milk of cement of adequate concentration; in that the continuous fibers previously treated, under tension, are wound up in at least one layer, on a layer previously projected onto a mandrel and constituted by a mixture of cement and chopped fibers, the concrete having been prepared from a siliceous material having a fine particle size. ; and in that the composite product thus obtained is made to harden at least partially before removing it from said mandrel. 2. A method according to claim 1 characterized in that the particle size of the silicon material used in the mortar of cement is between 0,
2 et 1,5 m .2 and 1.5 m.
3. Procédé suivant la revendication 1 , caractérisé en ce qu'on prépare le béton avec une quantité d'eau en excès.3. Method according to claim 1, characterized in that the concrete is prepared with an amount of excess water.
4. Procédé selon . _ la revendication 1 , caractérisé en ce que l'eau d'impré¬ gnation préalable des fibres continues contient un agent -mouillant.4. Method according to. _ claim 1, characterized in that the prior impré¬ gnation water of the continuous fibers contains a wetting agent.
5. Procédé selon la revendication 1 , caractérisé en ce que les fibres ha¬ chées et les fibres continues utilisées sont des fibres de verre. 5. Method according to claim 1, characterized in that the chopped fibers and the continuous fibers used are glass fibers.
6. Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications précédentes ca¬ ractérisé en ce qu'il comporte au moins deux cuves (3,45) pour les bains d'imprégnation successifs des fibres continues, lesdites cuves pouvant se déplacer suivant une direction parallèle à l'axe du mandrin (1) ;un. bras basculant 8) rύuni'd'un dispositif de projection (10) du mélange .de ciment et de fi¬ bres hachées sur le mandrin (1) et permettant' d'appliquer les fibres continues préalablement imprégnées sous tension sur le mandrin (1) enrobé du ciment, ledit bras basculant (8) étant agencé de manière telle qu'il permet l'enroulement des fibres continues à la manière d'une bobine autour du mandrin (Uqui est entraîné en rotation autour de son axe à vitesse adéquate.6. Device for implementing the method according to any one of the preceding claims, characterized in that it comprises at least two tanks (3,45) for successive impregnation baths of continuous fibers, said tanks being able to move in a direction parallel to the axis of the mandrel (1); a. rocker arm 8) rύuni 'of a projection device (10) of the mixture .de cement and fi¬ chopped fibers on the mandrel (1) and for' applying the continuous fibers previously impregnated under tension on the mandrel (1) coated with cement, said rocking arm (8) being arranged in such a way that it allows the winding of continuous fibers in the manner of a spool around the mandrel (U which is rotated around its axis at adequate speed.
7. Dispositif suivant la revendication 6 , caractérisé en ce qu'il comporte trois cuves (3, 4, 5) our les bains d'imprégnation successifs, c'est-à-dire l'eau contenant éventuellement un agent mouillant, et le lait- et/ou le mortier de ciment ; lesdites cuves pouvant se déplacer selon une direction parallèle à l'axe du mandriii (1) en fonction de la position du bras basculant (8)gui applique les fibres continues sous tension sur le mandrin préala¬ blement recouvert de ciment. 7. Device according to claim 6, characterized in that it comprises three tanks (3, 4, 5) for successive impregnation baths, that is to say water possibly containing a wetting agent, and the milk- and / or cement mortar; said tanks being able to move in a direction parallel to the axis of the mandriii (1) as a function of the position of the rocking arm (8) mistletoe applies the continuous fibers under tension to the mandrel previously covered with cement.
8. Corps creux à paroi mince caractérisé en ce qu'il consiste en un béton précontraint armé par des fi¬ bres continues et discontinues, ledit béton étant consti¬ tué par une matière siliceuse ayant une granulo étrie fine, de préférence comprise entre 0,2 et 1,5 mm, et pré- sentant une teneur en fibres allant jusqu'à 10 % en poids et plus du produit final obtenu.8. Thin-walled hollow body characterized in that it consists of a prestressed concrete reinforced by continuous and discontinuous fibers, said concrete being formed by a siliceous material having a fine grained grain, preferably between 0, 2 and 1.5 mm, and having a fiber content of up to 10% by weight or more of the final product obtained.
9. Corps creux suivant la revendication ..9. Hollow body according to claim ..
8- , caractérisé en ce qu'il contient 5 % en poids de ~ fibres de verre hachées projetées simultanément avec le ciment et jusqu'à 5 % en poids- de fibres de verre conti¬ nues enroulées . 8-, characterized in that it contains 5% by weight of ~ chopped glass fibers sprayed simultaneously with the cement and up to 5% by weight- of coiled naked glass fibers.
PCT/BE1985/000017 1984-05-22 1985-10-17 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby WO1987002301A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
LU85372A LU85372A1 (en) 1984-05-22 1984-05-22 Forming fibre-reinforced concrete components - has fibres wound under tension onto mandrel with simultaneous cement spray
PCT/BE1985/000017 WO1987002301A1 (en) 1985-10-17 1985-10-17 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby
EP19850905197 EP0252072A1 (en) 1985-10-17 1985-10-17 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby
IN105/DEL/87A IN170446B (en) 1985-10-17 1987-02-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BE1985/000017 WO1987002301A1 (en) 1985-10-17 1985-10-17 Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby

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IN (1) IN170446B (en)
LU (1) LU85372A1 (en)
WO (1) WO1987002301A1 (en)

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WO2007016420A3 (en) * 2005-08-02 2009-04-23 Specialty Composites Llc Method and apparatus for making fiber composite article
FR2923229A1 (en) * 2007-11-06 2009-05-08 Stephan Kumpf CONSTRUCTION BLOCK FOR WALL, MOUNTED WITH MORTAR JOINTS AND DRY, VENTILATED WITH DOUBLE ACTIONS

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FI166U1 (en) * 1992-02-21 1992-07-15 Betemi Oy Framstaellningsanordning Foer betongpelare
JPH05268109A (en) * 1992-03-23 1993-10-15 Sony Corp Ic for receiver and receiver using the ic
BE1010457A4 (en) * 1996-08-02 1998-09-01 Alexandre Graevenitz Method to produce hollow or flat bodies made of cement mortar reinforced with continuous fibres impregnated with acrylic fibres, products obtained and device for implementing the method
EP0879123A1 (en) * 1996-11-29 1998-11-25 Giancarlo Meli Production and molding system of elements of cement matrix, reinforced with glass fiber

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WO2007016420A3 (en) * 2005-08-02 2009-04-23 Specialty Composites Llc Method and apparatus for making fiber composite article
FR2923229A1 (en) * 2007-11-06 2009-05-08 Stephan Kumpf CONSTRUCTION BLOCK FOR WALL, MOUNTED WITH MORTAR JOINTS AND DRY, VENTILATED WITH DOUBLE ACTIONS
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Also Published As

Publication number Publication date
EP0252072A1 (en) 1988-01-13
IN170446B (en) 1992-03-28
LU85372A1 (en) 1986-01-29

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