EP0203857B1 - Mast, especially for supporting electric or telephone wires - Google Patents

Mast, especially for supporting electric or telephone wires Download PDF

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Publication number
EP0203857B1
EP0203857B1 EP86401076A EP86401076A EP0203857B1 EP 0203857 B1 EP0203857 B1 EP 0203857B1 EP 86401076 A EP86401076 A EP 86401076A EP 86401076 A EP86401076 A EP 86401076A EP 0203857 B1 EP0203857 B1 EP 0203857B1
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EP
European Patent Office
Prior art keywords
wall
post
fibres
walls
connecting means
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EP86401076A
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German (de)
French (fr)
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EP0203857A1 (en
Inventor
Pierre Bourrieres
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Manufacture dAppareillage Electrique de Cahors SA
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Manufacture dAppareillage Electrique de Cahors SA
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Priority to AT86401076T priority Critical patent/ATE58407T1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials

Definitions

  • the present invention relates to a pole, in particular for supporting electrical or telephone lines.
  • a composite post comprising a hollow longitudinal interior space surrounded by a shell which comprises a substantially rigid internal wall of synthetic resin reinforced with fibers, a certain number of rods. steel arranged longitudinally and distributed around the internal wall, these rods themselves being surrounded by a substantially rigid external wall made of synthetic resin reinforced with fibers, while a filler material keeps the rods in place between the two walls.
  • the object of the invention is to propose a tubular post composed essentially of plastic material which can be very particularly light, taking into account the load in bending-compression which it can withstand.
  • the pole in particular for supporting electrical or telephone lines, comprising a hollow longitudinal interior space surrounded by a shell comprising a substantially rigid internal wall comprising longitudinal fibers embedded in a mass of plastic material, this internal wall being even surrounded at a certain radial distance by an external wall comprising fibers extending in a substantially circumferential direction, connecting means being provided between the external and internal walls, is characterized in that the internal wall is produced by pultrusion and in that the longitudinal fibers of the internal wall are thus prestressed in tension within the plastic.
  • the connecting means ensure that the two walls cannot deform independently of one another, so that the shell locally has, in each sector of its periphery, a relatively large moment of inertia.
  • the weakness of the local moment of inertia which, despite the large value of the total moment of inertia, allows known metal tubular posts to bend under relatively low loads.
  • the substantially circumferential fibers prevent the outer wall from bursting, especially when the post is working in compression and in torsion (twisting). Flexion is a combination of traction and compression.
  • the longitudinal fibers prestressed in tension give each generating line of the post a great resistance to traction. They do not resist, on the other hand, not particularly to compression, but the outer shell with circumferential fibers plays in this respect a hooping role, transmitted to the internal wall by the connecting means arranged between the two walls.
  • the post shown in FIG. 1 comprises a cylindrical shell 1, of circular profile, surrounding a longitudinal internal hollow space 2.
  • the lower end of the post is planted, that is to say embedded, in the ground 3.
  • This kind of pole carries for example telephone or electric lines. It thus supports its own weight, the weight of the lines, and horizontal forces due for example to the wind or to the mechanical tension in the lines when they follow a non-rectilinear path in the horizontal plane. This results in horizontal forces F1 applied to the pole in the vicinity of its upper end, and vertical forces Fh generally spaced from the axis of the pole.
  • This type of loading, in flexion-compression, tends very strongly to make the post bend just above its embedding.
  • the shell 1 of the post comprises a substantially rigid internal wall 4 adjacent to the space 2 and an external wall 6 which surrounds the internal wall 4 at a certain radial distance from the latter.
  • the two walls 4, 6 are connected by a connecting means 7 which adheres firmly to each of them and therefore prevents one from deforming independently of the other.
  • the connecting means 7 is a filling material such as foam or felt.
  • each of the walls 4 and 6 is made of plastic material containing reinforcing fibers extending in the longitudinal direction of the post.
  • the walls 4 and 6 are obtained by the pultrusion process, that is to say a process of the extrusion type in which the product by the reinforcing fibers is pulled out of the extruder to keep the reinforcing fibers their orientation during extrusion.
  • the outer wall 6 contains fibers arranged in any order 11, some therefore being oriented in a substantially tangential direction and forming an angle with the longitudinal axis 12 (Figure 1) of the post.
  • some of the fibers 11 extend in a substantially circumferential direction.
  • the two walls 4 and 6 are made in one piece with the connecting means 7. It is indeed envisaged according to the invention to form a felt tube in the pultrusion machine, to guide this felt tube in the axis of the orifice of the pultrusion machine, and to carry out the pultrusion by pulling on the assembly formed by the two walls 4 and 6 between which the felt tube 7 is interposed. This gives very good adhesion. between each face of the felt tube and the adjacent wall 4 or 6 because the plastic material permeates the surface of the felt during extrusion.
  • the longitudinal fibers are guided by coaxial layers to be assigned to one or the other wall, and even to be distributed in the thickness of each wall. It is therefore possible to selectively introduce into the outer wall 6, the fibers in any order 11, by placing them between the longitudinal fibers intended for the outer wall.
  • the connecting means 7 is a foam
  • the two walls 4 and 6 can be produced independently of one another, then position the wall 4 in the wall 6 and inject the foam between the two walls.
  • the foam will be chosen for its qualities of adhesion to the plastic of the walls 4 and 6 and of good resistance to shear stresses.
  • the inner wall 4 and the connecting means 7 are unchanged.
  • the outer wall 6 is constituted by a filament winding produced in the circumferential direction around the connecting means 7.
  • the filament winding consists in winding on a body of multi-fiber wicks impregnated with resin.
  • the connecting means 7 are constituted by bridges 8 connecting the two walls 4, 6.
  • the bridges 8 are ribs extending axially over the entire length of the post.
  • the two walls 4 and 6 are integral with the ribs 8.
  • the whole is made of plastic reinforced with fibers extending in the longitudinal direction of the post. This one-piece structure can be obtained in a single operation by pultrusion.
  • the outer wall 6 also contains, substantially at mid-thickness and over its entire periphery, a fiberglass fabric 13. Due to its nature of fabric, the fiber fabric 13 necessarily comprises fibers extending tangentially forming an angle with the axis of the post. The tissue 13 is introduced into the extruder, by positioning relative to the longitudinal fibers.
  • the internal wall 4 is made in one piece with the ribs 8, of plastic material reinforced with longitudinal fibers, the whole obtained by pultrusion as in FIGS. 6 and 7.
  • the external wall 6 is constituted by a filament winding bearing on the tops of the ribs 8.
  • the external wall 6 has a polygonal profile whose vertices coincide with the tops of the ribs 8.
  • the walls 4, 6 can be extremely thin and the connecting means 7 very light, either because of their low density (felt or foam), or because of the hollows left between them (ribs 8). But in all cases, the local moment of inertia of the beam is considerably increased.
  • local moment of inertia we mean the moment of inertia of a part of the circumference of the beam profile, for example the part enclosed in the rectangle 9 in FIG. 3. It is more precisely the moment of inertia around axis 11 of greatest weakness which is considered.
  • moment of inertia of a part of the profile we designate the moment of inertia of this part independently of the support which can be given to it by the rest of the profile.
  • the moment of inertia of the profile part such as 9 around the axis 11 is much greater than the moment of inertia of a corresponding part of a single-walled tube of equivalent weight. Thanks to this increase in the local moment of inertia at each point of the periphery of the profile, the initial deformation which is necessary in the compressed region of a beam cannot occur for the buckling to take place.
  • the invention can be implemented with walls 4, 6 produced by a process other than pultrusion.
  • a material of the felt or foam type can be provided in the circumferential spaces between the ribs 8.
  • the tangential fibers could be made with the fabric of Figures 6 and 7.
  • the fibers in any order of Figures 1 to 3 could be used to make the tangential fibers of the embodiment according to Figures 6 and 7.
  • provision could also be made in the two embodiments (FIGS. 1 to 3, 6 and 7) to produce the tangential fibers by filament winding surrounding an extruded wall which could then only contain longitudinal fibers.

Abstract

A cylindrical shell (1) surrounds a longitudinal inner hollow space (2). The shell (1) comprises two coaxial walls (4, 6) made of plastic material reinforced with longitudinal fibres. The two walls arejoined by a low-density felt (7). Use for producing a lightweight mast having good resistance to buckling. <IMAGE>

Description

La présente invention concerne un poteau, notamment pour supporter des lignes électriques ou téléphoniques.The present invention relates to a pole, in particular for supporting electrical or telephone lines.

On sait réaliser des poteaux légers, notamment métalliques, en leur donnant une structure tubulaire. Toutefois, l'allègement obtenu est relativement restreint. En effet, ces poteaux sont sollicités en flexioncompression, ce qui favorise le flambement, c'est-à-dire le pliage brusque du poteau, notamment au voisinage de son encastrement, à savoir sa base. Or, en raison de l'effet dit "de coque ", les éléments tubulaires à paroi mince préviennent mal ce ri- que. Ils sont susceptibles de flambement sous des charges bien inférieures à celles résultant du calcul simplement basé sur les moments d'inertie.We know how to make light posts, especially metal, by giving them a tubular structure. However, the relief obtained is relatively limited. Indeed, these posts are stressed in flexioncompression, which promotes buckling, that is to say the sudden bending of the post, in particular in the vicinity of its embedding, namely its base. However, due to the so-called "shell" effect, the thin-walled tubular elements do not effectively prevent this risk. They are liable to buckling under loads much lower than those resulting from the calculation simply based on the moments of inertia.

On sait également réaliser, d'après le GB-A 2 074 213, un poteau composite comprenant un espace intérieur longitudinal creux entouré par une coque qui comprend une paroi interne sensiblement rigide en résine synthétique renforcée par des fibres, un certain nombre de tiges d'acier disposées longitudinalement et réparties autour de la paroi interne, ces tiges étant elles-mêmes entourées par une paroi externe sensiblement rigide en résine synthétique renforcée par des fibres, alors qu'un matériau de remplissage maintient les tiges en place entre les deux parois.We also know how to make, according to GB-A 2 074 213, a composite post comprising a hollow longitudinal interior space surrounded by a shell which comprises a substantially rigid internal wall of synthetic resin reinforced with fibers, a certain number of rods. steel arranged longitudinally and distributed around the internal wall, these rods themselves being surrounded by a substantially rigid external wall made of synthetic resin reinforced with fibers, while a filler material keeps the rods in place between the two walls.

Dans un tel poteau la résistance mécanique provient essentiellement des tiges d'acier, tandis que les autres parties, paroi interne ou externe et remplissage intermédiaire, ont comme fonction essentielle le maintien des tiges et la protection extérieure. Il en résulte que si un tel poteau composite permet un gain de poids par rapport à un poteau entièrement métallique, ce gain de poids demeure faible.In such a post, the mechanical resistance essentially comes from the steel rods, while the other parts, internal or external wall and intermediate filling, have as essential function the maintenance of the rods and the external protection. It follows that if such a composite post allows a weight gain compared to an all-metal post, this weight gain remains low.

Le but de l'invention est de proposer un poteau tubulaire composé essentiellement de matière plastique qui puisse être tout particulièrement léger, compte tenu de la charge en flexion-compression à laquelle il peut résister.The object of the invention is to propose a tubular post composed essentially of plastic material which can be very particularly light, taking into account the load in bending-compression which it can withstand.

Suivant l'invention, le poteau, notamment pour supporter des lignes électriques ou téléphoniques, comprenant un espace intérieur longitudinal creux entouré par une coque comprenant une paroi interne sensiblement rigide comprenant des fibres longitudinales noyées dans une masse de matière plastique, cette paroi interne étant elle-même entourée à une certaine distance radiale par une paroi externe comprenant des fibres s'étendant selon une direction sensiblement circonférentielle, des moyens de liaison étant prévus entre les parois externe et interne, est caractérisé en ce que la paroi interne est réalisée par pultrusion et en ce que les fibres longitudinales de la paroi interne sont ainsi précontraintes en traction au sein de la matière plastique.According to the invention, the pole, in particular for supporting electrical or telephone lines, comprising a hollow longitudinal interior space surrounded by a shell comprising a substantially rigid internal wall comprising longitudinal fibers embedded in a mass of plastic material, this internal wall being even surrounded at a certain radial distance by an external wall comprising fibers extending in a substantially circumferential direction, connecting means being provided between the external and internal walls, is characterized in that the internal wall is produced by pultrusion and in that the longitudinal fibers of the internal wall are thus prestressed in tension within the plastic.

Dans ces conditions, même si les deux parois sont très minces, le flambement n'apparaît que pour des charges relativement importantes. En effet, les moyens de liaison font en sorte que les deux parois ne peuvent se déformer indépendamment l'une de l'autre, si bien que la coque a localement, en chaque secteur de son pourtour, un moment d'inertie relativement important. C'est au contraire la faiblesse du moment d'inertie local qui, malgré la valeur importante du moment d'inertie total, permet aux poteaux tubulaires métalliques connus de plier sous des charges relativement faibles. Les fibres sensiblement circonférentielles empêchent l'éclatement de la paroi extérieure, notamment lorsque le poteau travaille en compression et en torsion (vrillage). La flexion est une combinaison de traction et de compression. Les fibres longitudinales précontraintes en traction donnent à chaque ligne génératrice du poteau une grande résistance à la traction. Elles ne résistent, par contre, pas particulièrement à la compression, mais la coque extérieure à fibres circonférentielles joue à cet égard un rôle de frettage, transmis à la paroi interne par les moyens de liaison disposés entre les deux parois.Under these conditions, even if the two walls are very thin, the buckling appears only for relatively large loads. Indeed, the connecting means ensure that the two walls cannot deform independently of one another, so that the shell locally has, in each sector of its periphery, a relatively large moment of inertia. On the contrary, it is the weakness of the local moment of inertia which, despite the large value of the total moment of inertia, allows known metal tubular posts to bend under relatively low loads. The substantially circumferential fibers prevent the outer wall from bursting, especially when the post is working in compression and in torsion (twisting). Flexion is a combination of traction and compression. The longitudinal fibers prestressed in tension give each generating line of the post a great resistance to traction. They do not resist, on the other hand, not particularly to compression, but the outer shell with circumferential fibers plays in this respect a hooping role, transmitted to the internal wall by the connecting means arranged between the two walls.

D'autres particularités et avantages de l'invention ressortiront encore de la description ci-après.Other features and advantages of the invention will emerge from the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs :

  • - la figure 1 est une vue schématique en coupe longitudinale, avec arrachement, d'un poteau conforme à l'invention ;
  • - la figure 2 est une vue en perspective du poteau de la figure 1, également avec arrachement ;
  • - la figure 3 est une vue du détail III de la figure 2, ramené dans un plan de coupe transversal ;
  • - la figure 4 est une vue en coupe transversale d'un second mode de réalisation du poteau ;
  • - la figure 5 est une vue du détail V de la figure 4 ;
  • - la figure 6 est une vue en perspective d'un troisième mode de réalisation du poteau, avec arrachement ;
  • - la figure 7 est une vue à échelle agrandie du détail VII de la figure 6 ;
  • - la figure 8 est une vue en coupe transversale d'un quatrième mode de réalisation du poteau; et
  • - la figure 9 est une vue à échelle agrandie du détail IX de la figure 8.
In the appended drawings, given by way of nonlimiting examples:
  • - Figure 1 is a schematic view in longitudinal section, with parts broken away, of a post according to the invention;
  • - Figure 2 is a perspective view of the post of Figure 1, also with cutaway;
  • - Figure 3 is a view of detail III of Figure 2, brought into a transverse section plane;
  • - Figure 4 is a cross-sectional view of a second embodiment of the pole;
  • - Figure 5 is a view of detail V of Figure 4;
  • - Figure 6 is a perspective view of a third embodiment of the post, with cutaway;
  • - Figure 7 is an enlarged view of detail VII of Figure 6;
  • - Figure 8 is a cross-sectional view of a fourth embodiment of the pole; and
  • FIG. 9 is a view on an enlarged scale of detail IX of FIG. 8.

Le poteau représenté à la figure 1 comprend une coque cylindrique 1, de profil circulaire, entourant un espace creux interne longitudinal 2. L'extrémité inférieure du poteau est plantée, c'est-à-dire encastrée, dans le sol 3.The post shown in FIG. 1 comprises a cylindrical shell 1, of circular profile, surrounding a longitudinal internal hollow space 2. The lower end of the post is planted, that is to say embedded, in the ground 3.

Ce genre de poteau porte par exemple des lignes téléphoniques ou électriques. Il supporte ainsi son propre poids, le poids des lignes, et des efforts horizontaux dus par exemple au vent ou encore à la tension mécanique dans les lignes lorsqu'elles suivent un trajet non rectiligne dans le plan horizontal. Il en résulte sur le poteau des efforts horizontaux F1 appliqués au voisinage de son extrémité supérieure, et des efforts verticaux Fh généralement écartés de l'axe du poteau. Ce type de chargement, en flexion-compression, tend très fortement à faire plier le poteau juste au-dessus de son encastrement. Pour remédier à cela, la coque 1 du poteau selon l'invention comprend une paroi interne 4 sensiblement rigide adjacente à l'espace 2 et une paroi externe 6 qui entoure la paroi interne 4 à une certaine distance radiale de cette dernière. Les deux parois 4, 6 sont raccordées par un moyen de liaison 7 qui adhère fermement à chacune d'elles et empêche par conséquent l'une de se déformer indépendamment de l'autre. Dans l'exemple représenté aux figures 1 à 3, le moyen de liaison 7 est une matière de remplissage telle qu'une mousse ou un feutre.This kind of pole carries for example telephone or electric lines. It thus supports its own weight, the weight of the lines, and horizontal forces due for example to the wind or to the mechanical tension in the lines when they follow a non-rectilinear path in the horizontal plane. This results in horizontal forces F1 applied to the pole in the vicinity of its upper end, and vertical forces Fh generally spaced from the axis of the pole. This type of loading, in flexion-compression, tends very strongly to make the post bend just above its embedding. To remedy this, the shell 1 of the post according to the invention comprises a substantially rigid internal wall 4 adjacent to the space 2 and an external wall 6 which surrounds the internal wall 4 at a certain radial distance from the latter. The two walls 4, 6 are connected by a connecting means 7 which adheres firmly to each of them and therefore prevents one from deforming independently of the other. In the example shown in Figures 1 to 3, the connecting means 7 is a filling material such as foam or felt.

Comme le montre la figure 3, chacune des parois 4 et 6 est réalisée en matière plastique contenant des fibres de renforcement s'étendant selon la direction longitudinale du poteau. De préférence, les parois 4 et 6 sont obtenues par le procédé de pultrusion c'est-à-dire un procédé du type extrusion dans lequel on tire le produit par les fibres de renforcement hors de l'extrudeuse pour conserver aux fibres de renforcement leur orientation pendant l'extrusion.As shown in Figure 3, each of the walls 4 and 6 is made of plastic material containing reinforcing fibers extending in the longitudinal direction of the post. Preferably, the walls 4 and 6 are obtained by the pultrusion process, that is to say a process of the extrusion type in which the product by the reinforcing fibers is pulled out of the extruder to keep the reinforcing fibers their orientation during extrusion.

De plus, la paroi externe 6 renferme des fibres disposées en ordre quelconque 11, certaines étant donc orientées selon une direction sensiblement tangentielle et formant un angle avec l'axe longitudinal 12 (figure 1) du poteau. Notamment, certaines des fibres 11 s'étendent en direction sensiblement circonférentielle.In addition, the outer wall 6 contains fibers arranged in any order 11, some therefore being oriented in a substantially tangential direction and forming an angle with the longitudinal axis 12 (Figure 1) of the post. In particular, some of the fibers 11 extend in a substantially circumferential direction.

De préférence, les deux parois 4 et 6 sont réalisées d'un seul tenant avec le moyen de liaison 7. Il est en effet envisagé selon l'invention de former un tube de feutre dans la machine de pultrusion, de guider ce tube de feutre dans l'axe de l'orifice de la machine de pultrusion, et de réaliser la pultrusion en tirant sur l'ensemble constitué par les deux parois 4 et 6 entre lesquelles est interposé le tube de feutre 7. On obtient ainsi une très bonne adhérence entre chaque face du tube de feutre et la paroi 4 ou 6 adjacente car la matière plastique imprègne la surface du feutre pendant l'extrusion.Preferably, the two walls 4 and 6 are made in one piece with the connecting means 7. It is indeed envisaged according to the invention to form a felt tube in the pultrusion machine, to guide this felt tube in the axis of the orifice of the pultrusion machine, and to carry out the pultrusion by pulling on the assembly formed by the two walls 4 and 6 between which the felt tube 7 is interposed. This gives very good adhesion. between each face of the felt tube and the adjacent wall 4 or 6 because the plastic material permeates the surface of the felt during extrusion.

Pour former le tube en feutre, mousse ou autre matière, on peut assembler côte à côte des bandes dans le sens longitudinal, ou bien refermer sur elle-même une bande ayant une largeur égale au périmètre du tube, ou encore enrouler hélicoïdalement une bande.To form the tube of felt, foam or other material, it is possible to assemble bands side by side in the longitudinal direction, or to close on itself a band having a width equal to the perimeter of the tube, or else to wrap a band helically.

Pendant la pultrusion, les fibres longitudinales sont guidées par nappes coaxiales pour être affectées à l'une ou l'autre paroi, et même pour être réparties dans l'épaisseur de chaque paroi. Il est donc possible d'introduire sélectivement dans la paroi extérieure 6, les fibres en ordre quelconque 11, en les disposant entre les fibres longitudinales destinées à la paroi extérieure.During pultrusion, the longitudinal fibers are guided by coaxial layers to be assigned to one or the other wall, and even to be distributed in the thickness of each wall. It is therefore possible to selectively introduce into the outer wall 6, the fibers in any order 11, by placing them between the longitudinal fibers intended for the outer wall.

Si le moyen de liaison 7 est une mousse, on peut réaliser les deux parois 4 et 6 indépendamment l'une de l'autre, puis positionner la paroi 4 dans la paroi 6 et injecter la mousse entre les deux parois. La mousse sera choisie pour ses qualités d'adhérence à la matière plastique des parois 4 et 6 et de bonne résistance aux contraintes de cisaillement.If the connecting means 7 is a foam, the two walls 4 and 6 can be produced independently of one another, then position the wall 4 in the wall 6 and inject the foam between the two walls. The foam will be chosen for its qualities of adhesion to the plastic of the walls 4 and 6 and of good resistance to shear stresses.

Dans l'exemple des figures 4 et 5, la paroi interne 4 et le moyen de liaison 7 sont inchangés. Cependant, la paroi externe 6 est constituée par un enroulement filamentaire réalisé dans le sens circonférentiel autour du moyen de liaison 7. Comme l'on sait, l'enroulement filamentaire consiste à enrouler sur un corps des mèches à fibres multiples imprégnées de résine.In the example of Figures 4 and 5, the inner wall 4 and the connecting means 7 are unchanged. However, the outer wall 6 is constituted by a filament winding produced in the circumferential direction around the connecting means 7. As is known, the filament winding consists in winding on a body of multi-fiber wicks impregnated with resin.

Dans les exemples des figures 6 à 9, les moyens de liaison 7 sont constitués par des ponts 8 raccordant les deux parois 4, 6. Dans les modes de réalisation présentés, les ponts 8 sont des nervures s'étendant axialement sur toute la longueur du poteau.In the examples of Figures 6 to 9, the connecting means 7 are constituted by bridges 8 connecting the two walls 4, 6. In the embodiments presented, the bridges 8 are ribs extending axially over the entire length of the post.

Dans l'exemple des figures 6 et 7, les deux parois 4 et 6 sont monoblocs avec les nervures 8. Le tout est en matière plastique renforcée par des fibres s'étendant selon la direction longitudinale du poteau. Cette structure monobloc peut être obtenue en une seule opération par pultrusion.In the example of Figures 6 and 7, the two walls 4 and 6 are integral with the ribs 8. The whole is made of plastic reinforced with fibers extending in the longitudinal direction of the post. This one-piece structure can be obtained in a single operation by pultrusion.

La paroi extérieure 6 renferme en outre, sensiblement à mi-épaisseur et sur tout son pourtour, un tissu en fibre de verre 13. En raison de sa nature de tissu, le tissu en fibre 13 comporte nécessairement des fibres s'étendent tangentiellement en formant un angle avec l'axe du poteau. L'introduction du tissu 13 se fait dans l'extrudeuse, par positionnement relativement aux fibres longitudinales.The outer wall 6 also contains, substantially at mid-thickness and over its entire periphery, a fiberglass fabric 13. Due to its nature of fabric, the fiber fabric 13 necessarily comprises fibers extending tangentially forming an angle with the axis of the post. The tissue 13 is introduced into the extruder, by positioning relative to the longitudinal fibers.

Dans l'exemple des figures 8 et 9, la paroi interne 4 est réalisée monobloc avec les nervures 8, en matière plastique renforcée de fibres longitudinales, le tout obtenu par pultrusion comme aux figures 6 et 7.In the example of FIGS. 8 and 9, the internal wall 4 is made in one piece with the ribs 8, of plastic material reinforced with longitudinal fibers, the whole obtained by pultrusion as in FIGS. 6 and 7.

Cependant, la paroi externe 6 est constituée par un enroulement filamentaire prenant appui sur les sommets des nervures 8. Ainsi, la paroi externe 6 a un profil polygonal dont les sommets coïncident avec les sommets des nervures 8.However, the external wall 6 is constituted by a filament winding bearing on the tops of the ribs 8. Thus, the external wall 6 has a polygonal profile whose vertices coincide with the tops of the ribs 8.

Dans tous les exemples qui viennent d'être décrits, les parois 4, 6 peuvent être extrêmement minces et les moyens de liaison 7 très légers, soit en raison de leur faible densité (feutre ou mousse), soit en raison des creux laissés entre eux (nervures 8). Mais dans tous les cas, le moment d'inertie local de la poutre est considérablement accru. Par moment d'inertie local, on désigne le moment d'inertie d'une partie de la circonférence du profil de la poutre, par exemple la partie renfermée dans le rectangle 9 à la figure 3. C'est plus précisément le moment d'inertie autour de l'axe 11 de plus grande faiblesse qui est considéré. Par moment d'inertie d'une partie du profil, on désigne le moment d'inertie de cette partie indépendamment du soutien qui peut lui être apporté par le reste du profil. Grâce à la configuration selon l'invention, le moment d'inertie de la partie de profil telle que 9 autour de l'axe 11 est nettement plus grand que ie moment d'inertie d'une partie correspondante d'un tube à simple paroi de poids équivalent. Grâce à cette augmentation du moment d'inertie local en chaque point du pourtour du profil, il ne peut pas se produire la déformation initiale qui est nécessaire dans la région comprimée d'une poutre pour que le flambement ait lieu.In all the examples which have just been described, the walls 4, 6 can be extremely thin and the connecting means 7 very light, either because of their low density (felt or foam), or because of the hollows left between them (ribs 8). But in all cases, the local moment of inertia of the beam is considerably increased. By local moment of inertia, we mean the moment of inertia of a part of the circumference of the beam profile, for example the part enclosed in the rectangle 9 in FIG. 3. It is more precisely the moment of inertia around axis 11 of greatest weakness which is considered. By moment of inertia of a part of the profile, we designate the moment of inertia of this part independently of the support which can be given to it by the rest of the profile. Thanks to the configuration according to the invention, the moment of inertia of the profile part such as 9 around the axis 11 is much greater than the moment of inertia of a corresponding part of a single-walled tube of equivalent weight. Thanks to this increase in the local moment of inertia at each point of the periphery of the profile, the initial deformation which is necessary in the compressed region of a beam cannot occur for the buckling to take place.

Bien entendu, l'invention n'est pas limitée aux exemples décrits et représentés, et de nombreux aménagements peuvent être apportés à ces exemples sans sortir du cadre de l'invention, défini par la teneur des revendications.Of course, the invention is not limited to the examples described and shown, and numerous modifications can be made to these examples without departing from the scope of the invention, defined by the content of the claims.

C'est ainsi que l'invention peut être mise en oeuvre avec des parois 4, 6 réalisées par un procédé autre que la pultrusion.Thus, the invention can be implemented with walls 4, 6 produced by a process other than pultrusion.

Dans l'exemple des figures 6 à 9, un matériau du genre feutre ou mousse peut être prévu dans les espaces circonférentiels entre les nervures 8.In the example of FIGS. 6 to 9, a material of the felt or foam type can be provided in the circumferential spaces between the ribs 8.

Dans le mode de réalisation des figures 1 à 3, les fibres tangentielles pourraient être réalisées avec le tissu des figures 6 et 7. De même, les fibres en ordre quelconque des figures 1 à 3 pourraient servir à réaliser les fibres tangentielles du mode de réalisation selon les figures 6 et 7. Au lieu de tout cela, on pourrait encore prévoir dans les deux modes de réalisation (figures 1 à 3, 6 et 7) de réaliser les fibres tangentielles par enroulement filamentaire entourant une paroi extrudée qui pourrait alors ne renfermer que des fibres longitudinales.In the embodiment of Figures 1 to 3, the tangential fibers could be made with the fabric of Figures 6 and 7. Likewise, the fibers in any order of Figures 1 to 3 could be used to make the tangential fibers of the embodiment according to Figures 6 and 7. Instead of all this , provision could also be made in the two embodiments (FIGS. 1 to 3, 6 and 7) to produce the tangential fibers by filament winding surrounding an extruded wall which could then only contain longitudinal fibers.

Claims (9)

1. A post, in particular for carrying electric or telephone lines, in which an inner longitudinal hollow space (2) is bounded by a shell (1) comprising a substantially rigid inner wall (4) having longitudinal fibres embedded in a plastics mass, the inner wall (4) having extending around it at a radial distance from it an outer wall (6) comprising fibres (11) extending substantially in a circumferential direction, connecting means (7) being provided between the outer wall (6) and inner wall (4), characterised in that the inner wall (4) is produced by pultrusion and the longitudinal fibres of the inner wall (4) are therefore prestressed in tension in the plastics.
2. A post according to claim 1, characterised in that the fibres (11) of the outer wall (6) comprise a substantially circumferentially extending filamentary winding around the connecting means (7).
3. A post according to claim 1 or 2, characterised in that the fibres of the outer wall (6) comprise fibres (11,13) embedded in the plastics mass.
4. A post according to any of claims 1 to 3, characterised in that the inner wall (4) and at least part of the outer wall (6) are produced by pultrusion integral with the connecting means (7).
5. A post according to any of claims 1 to 4, characterised in that the connecting means (7) comprise bridges (8) which extend between the two walls (4, 6).
6. A post according to claim 5, characterised in that the bridges (8) are ribs which extend lengthwise between the two walls (4, 6).
7. A post according to claim 6, characterised in that the ribs (8) are monolithic with at least one of the walls (4, 6).
8. A post according to claim 6, characterised in that the ribs (8) are produced by pultrusion integral with the inner wall (4) and contain fibres which extend substantially according to the length of the post.
9. A post according to any of claims 1 to 4, characterised in that the connecting means (7) comprise a low density material such as felt or foam.
EP86401076A 1985-05-28 1986-05-22 Mast, especially for supporting electric or telephone wires Expired - Lifetime EP0203857B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401076T ATE58407T1 (en) 1985-05-28 1986-05-22 MAST, ESPECIALLY FOR CARRYING ELECTRICAL OR TELEPHONE LINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8507953A FR2582706B1 (en) 1985-05-28 1985-05-28 POST, PARTICULARLY FOR SUPPORTING ELECTRIC OR TELEPHONE LINES
FR8507953 1985-05-28

Publications (2)

Publication Number Publication Date
EP0203857A1 EP0203857A1 (en) 1986-12-03
EP0203857B1 true EP0203857B1 (en) 1990-11-14

Family

ID=9319592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401076A Expired - Lifetime EP0203857B1 (en) 1985-05-28 1986-05-22 Mast, especially for supporting electric or telephone wires

Country Status (9)

Country Link
EP (1) EP0203857B1 (en)
JP (1) JPS61277780A (en)
CN (1) CN86103634A (en)
AT (1) ATE58407T1 (en)
DE (2) DE3675581D1 (en)
ES (1) ES296792Y (en)
FI (1) FI862237A (en)
FR (1) FR2582706B1 (en)
NO (1) NO162877C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2111724A1 (en) * 1993-12-17 1995-06-18 Raymond Wayne Gillard Scaffold system
FR2714409B1 (en) * 1993-12-23 1996-03-15 Cogidev Load-bearing structure that can be used as a post or beam.
EP1062399B1 (en) * 1998-03-19 2003-10-22 Paul W. Fournier Utility pole mounting structure
FR2871215B1 (en) * 2004-06-04 2007-08-17 Epsilon Composite Sarl Sarl PROCESS FOR MANUFACTURING A TUBE OF COMPOSITE MATERIAL OF HIGH STIFFNESS, AND TUBE OBTAINED
RU2007104928A (en) * 2004-07-09 2008-08-20 Айфель Дойчланд Штальтехнологи Гмбх (De) TUBULAR STRUCTURE AND METHOD OF ITS CONSTRUCTION
WO2009009425A2 (en) * 2007-07-09 2009-01-15 Scott Ryan Support pole structure and method of manufacture
US8192572B2 (en) * 2008-04-25 2012-06-05 General Electric Company Composite wind turbine tower and a method for fabricating same
GB2491854A (en) * 2011-06-14 2012-12-19 Stephen Howard A post containing loose material for limiting collision damage
CN102705180A (en) * 2012-06-25 2012-10-03 济南轨道交通装备有限责任公司 Wind power tower cylinder made of composite materials
CN104240771B (en) * 2014-10-11 2016-08-31 安吉安宁生物科技有限公司 A kind of anti-disaster supporting structure of trapping lamp
NO20160271A1 (en) * 2016-02-16 2016-11-04 Comrod As Apparatus and method for attaching and creating a composite mast.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812414A (en) * 1954-12-24 1959-04-22 Gar Wood Ind Inc Supporting members such as telephone poles
US4007075A (en) * 1973-12-10 1977-02-08 Cascade Pole Company Method of making a fiberglass pole
GB2074213B (en) * 1980-04-17 1983-11-30 Hepworth Plastics Ltd Poles and posts
DE3242161A1 (en) * 1982-11-13 1984-05-17 Hans 8100 Garmisch-Partenkirchen Langmatz Maintenance-free plastic post for lamps, traffic lights, traffic signs and the like

Also Published As

Publication number Publication date
ES296792U (en) 1988-01-16
DE203857T1 (en) 1987-03-19
ES296792Y (en) 1988-09-16
NO162877C (en) 1990-02-28
FI862237A (en) 1986-11-29
JPS61277780A (en) 1986-12-08
FI862237A0 (en) 1986-05-27
FR2582706B1 (en) 1989-09-01
FR2582706A1 (en) 1986-12-05
ATE58407T1 (en) 1990-11-15
NO162877B (en) 1989-11-20
EP0203857A1 (en) 1986-12-03
DE3675581D1 (en) 1990-12-20
NO862037L (en) 1986-12-01
CN86103634A (en) 1986-11-26

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