EP0595679A1 - Shuttering and method of production - Google Patents

Shuttering and method of production Download PDF

Info

Publication number
EP0595679A1
EP0595679A1 EP93402520A EP93402520A EP0595679A1 EP 0595679 A1 EP0595679 A1 EP 0595679A1 EP 93402520 A EP93402520 A EP 93402520A EP 93402520 A EP93402520 A EP 93402520A EP 0595679 A1 EP0595679 A1 EP 0595679A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing elements
faces
tubular element
tubular
cardboard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93402520A
Other languages
German (de)
French (fr)
Inventor
Jean-Paul Languillat
Bernard Anneheim
Vim Van De Camp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonoco Products Co
Original Assignee
Sonoco Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sonoco Products Co filed Critical Sonoco Products Co
Publication of EP0595679A1 publication Critical patent/EP0595679A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor

Definitions

  • Formwork used for the production of posts or pillars in poured concrete has long been made using wooden and / or metal elements.
  • Patent US-3,301,926 or French patent applications 2606813 and 2616469 also describe a formwork of the same type, that is to say comprising a tubular molding element whose planar walls define a prism with a writable cross section corresponding to the cross section of the finished product to be molded, a cardboard holding tube with circular section which circumscribes the external section of the tubular molding element and wedging elements arranged in the spaces between the external faces of said tubular molding element and the internal face of the retaining tube.
  • the spaces between the tubular molding element and the retaining tube are not completely filled, so that the tubular molding element is not supported. total on a homogeneous material.
  • the inventors have had the merit of completely rethinking the technique and producing easy-to-manufacture formwork with very good resistance to internal compression.
  • a formwork according to the invention comprises in known manner a tubular molding element provided with flat walls which define a prism whose polygonal cross section corresponds to that of the finished product to be molded, and reinforcing elements which come to cover the external faces of said element.
  • the reinforcing elements each have a prismatic shape with a triangular or trapezoidal section whose dimensions of the large base correspond to those of the outer face of the tubular element to which it is applied and the angles of which at the base are chosen such that two adjacent lateral faces of two successive reinforcing elements are substantially coplanar.
  • the external wrapping will then form a prismatic sheath with 2 n faces, n being the number of sides of the polygonal section of the tubular element, without count any chamfers made on its edges.
  • the cross section of the reinforcing elements is in the form of a triangle or isosceles trapezoid with angles at the base each equal to 180 ° divided by n .
  • the tubular molding element is made of cardboard and the reinforcing elements are made of cellular cardboard, the edges of each cell of which are arranged perpendicular to the flat wall opposite the tubular molding element.
  • honeycomb has the advantage of being recyclable and has excellent resistance, other materials are obviously perfectly possible.
  • the prismatic tubular element is manufactured from a cardboard plate possibly grooved to form edge chamfers and the face intended to constitute the interior of the formwork is treated to make it waterproof.
  • the wrapping is carried out by a straight winding over several turns by means of at least one strip of cardboard, the width corresponds to the length of the set to be wrapped.
  • the wrapping is carried out by means of at least one strip of cardboard of small width compared to the length of the assembly to be wrapped and which is helically wound by spiraling.
  • the last strip used for the wrapping can furthermore have, on at least its outer face, a treatment to make it waterproof in order to form a last waterproof coating, this moreover being able to carry advertising and / or explanatory inscriptions of a method of 'employment.
  • the reinforcing elements are produced from a sheet of cellular cardboard.
  • said reinforcing elements are cut accordingly from, for example, a plate of a suitable material.
  • the reinforcing elements are held on the flat outer faces of the tubular element before wrapping, by gluing and / or by strapping of adhesive strips.
  • a prismatic tubular element is first produced from a plate 1, for example from cardboard 3 ( Figures 1, 2, 3 and 5).
  • the prismatic tubular element 1 produced (FIGS. 3 and 5) has a substantially square-shaped section (the same reference 1 is used to designate either the tubular element or the plate from which it is made).
  • the cardboard plate 1 ( Figures 1 and 2) is grooved as shown in said figures (by arrows in Figure 1 and dotted lines in Figure 2), to divide the plate 1 into four main parts 1 a to 1d, intended to form the four walls of the prism ( Figure 3) after folding along the grooves thus produced.
  • the tubular element 1 is closed for example by means of an adhesive tape 3 (figure 4), or any other means, which is here disposed longitudinally between a main face 1a and a chamfer 2d.
  • the prismatic tubular element 1 thus produced must also have the desired dimensions for the finished product to be molded.
  • a sheet of honeycomb cardboard 4 ( Figure 4) is cut as shown in Figure 4 into several elements such as 4a to 4f.
  • each element 4a to 4f has a prismatic shape with a trapezoidal section and more particularly in the form of an isosceles trapezium whose angles of the large base are 45 °.
  • each trapezoidal prismatic element has dimensions corresponding to those of the faces 1 a to 1d of the tubular element 1. It is understood that a cutting as shown in Figure 4 (at 45 ° alternately), can significantly limit falls, which is a particularly economical technique.
  • the prismatic tubular element 1 is then placed on a mandrel 5 (FIG. 5) whose cross section corresponds to the internal cross section of said element 1 (including chamfers), the latter being closed longitudinally by the adhesive strip 3 before or after its positioning on said mandrel 5.
  • the mandrel 5 is expandable using, for example, shells 6a to 6d ( Figure 5) capable of deviating from the axis of said mandrel by any hydraulic means and / or pneumatic and / or mechanical.
  • the reinforcing elements 4a to 4d are positioned, as shown in FIG. 6, by applying the large bases of said elements to the faces of element 1.
  • the dimensions of said reinforcing elements 4a to 4d are such (base angles of 45 °) that two lateral faces adjacent to two successive reinforcing elements are substantially coplanar.
  • the reinforcing elements 4a to 4d are held by gluing their faces which are in contact with the tubular element 1 and / or by strapping by means of adhesive strips such as 7a to 7d in FIGS. 6, 7 and 9.
  • the spiraling is advantageously carried out in several layers and possibly in crossed layers by means of at least one strip glued at least in part on at least one of its faces (or even its two faces).
  • the strip 8 used obviously has a relatively small width compared to the semi-finished product.
  • a finished product is thus obtained (after withdrawal of the mandrel) as shown in Figures 8 and 10, that is to say that the wrapping forms an outer sheath in the form of an octagon here (regular or not depending on the thickness chosen for the reinforcing elements).
  • tubular element 1 here has a substantially square section, this is a special case of a rectangular section and more generally, said section is polygonal, regular or not.
  • section of the tubular molding element can be generalized in this way, that of the reinforcing elements can be other than in the form of a trapezoid or triangle, as for example in a circular segment.
  • finishes can and / or must be made, such as a last waterproof wrapping band (possibly on a single turn for a straight winding and on a single fold for spiraling), a sealing treatment for the ends, prints on the outside of the last strip, etc.
  • Such formwork can surprisingly withstand high stresses, which is obviously desired for molding concrete posts or pillars.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Making Paper Articles (AREA)

Abstract

The invention relates to a shuttering which includes a tubular moulding element (1) provided with plane walls which define a prism, the polygonal cross-section of which corresponds to that of the finished product to be moulded, and reinforcement elements (4a-4d) which cover the external faces of the said tubular moulding element, which shuttering is noteworthy in that the said reinforcement elements (4a-4d) are held gripped on the tubular element by the helical wrapping (strapping) of at least one tape (8) of material, adhesively coated, at least partially, on at least one of its faces. The invention also relates to a method of manufacture which recommends using a straight wrapping of a wide tape or a spiralled wrapping with a narrow tape, especially by means of a winding mandrel (5). <IMAGE>

Description

Les coffrages utilisés pour la fabrication de poteaux ou piliers en béton coulé ont longtemps été réalisés au moyen d'éléments en bois et/ou métalliques.Formwork used for the production of posts or pillars in poured concrete has long been made using wooden and / or metal elements.

Une autre technique a toutefois été imaginée pour réaliser des coffrages beaucoup moins onéreux, prêts à l'emploi et généralement utilisables qu'une seule fois, ce qui représente sur un chantier de nonbreux avantages étant donné notamment la facilité et la rapidité de mise en oeuvre.Another technique, however, has been devised to produce much cheaper formwork, ready to use and generally usable only once, which represents a considerable number of advantages on a site, given in particular the ease and speed of implementation. .

Selon la technique décrite notamment dans le brevet Français 1513315, on utilise en grande partie du carton.According to the technique described in particular in French patent 1513315, cardboard is largely used.

Le brevet US-3,301,926 ou encore les demandes de brevet Français 2606813 et 2616469 décrivent également un coffrage de même type, c'est-à-dire comportant un élément tubulaire de moulage dont les parois planes définissent un prisme à section droite inscriptible correspondant à la section droite du produit fini à mouler, un tube de maintien en carton à section circulaire qui circonscrit la section extérieure de l'élément tubulaire de moulage et des éléments de calage disposés dans les espaces compris entre les faces externes dudit élément tubulaire de moulage et la face interne du tube de maintien.Patent US-3,301,926 or French patent applications 2606813 and 2616469 also describe a formwork of the same type, that is to say comprising a tubular molding element whose planar walls define a prism with a writable cross section corresponding to the cross section of the finished product to be molded, a cardboard holding tube with circular section which circumscribes the external section of the tubular molding element and wedging elements arranged in the spaces between the external faces of said tubular molding element and the internal face of the retaining tube.

Afin d'avoir une bonne résistance, il est évidemment souhaitable de concevoir des éléments de calage ayant une bonne résistance à la compression.In order to have a good resistance, it is obviously desirable to design wedging elements having a good resistance to compression.

On a aussi imaginé dans le brevet FR-2628465, un coffrage muni d'un tube extérieur dont la section n'est plus circulaire, mais qui est un quadrilatère.We also imagined in patent FR-2628465, a formwork provided with an outer tube whose section is no longer circular, but which is a quadrilateral.

Dans les brevets précités 1513315 et 2628465, on préconise de remplir les espaces libres entre l'élément tubulaire de moulage et le tube de maintien avec notamment du polystyrène. Dans le brevet US-3,301,926, on décrit par contre un procédé d'injection d'un matériau de ce type.In the aforementioned patents 1513315 and 2628465, it is recommended to fill the free spaces between the tubular molding element and the retaining tube with in particular polystyrene. In US Pat. No. 3,301,926, however, a method of injecting a material of this type is described.

Toutefois, ces produits de calage sont très polluants du fait que le coffrage, après utilisation, est détruit en coupant le tube de maintien.However, these wedging products are very polluting because the formwork, after use, is destroyed by cutting the holding tube.

Dans les demandes Françaises précitées 2606813 et 2616469, on a imaginé diverses cales, notamment en carton, de formes diverses (tubes, cartons pliés, ...).In the aforementioned French applications 2606813 and 2616469, various wedges, in particular of cardboard, of various shapes were imagined (tubes, folded cartons, ...).

Toutefois, par rapport à la technique précitée de l'injection, les espaces compris entre l'élément tubulaire de moulage et le tube de maintien ne sont pas entièrement remplis, de telle sorte que l'élément tubulaire de moulage n'est pas en appui total sur un matériau homogène.However, compared to the aforementioned injection technique, the spaces between the tubular molding element and the retaining tube are not completely filled, so that the tubular molding element is not supported. total on a homogeneous material.

Toutes les techniques précitées nécessitent l'utilisation d'un élément tubulaire de moulage et d'un tube de maintien en carton, entre lesquels sont disposés lesdits éléments de calage, le tube de maintien généralement circulaire semblant obligatoire pour assurer une bonne résistance à la compression intérieure.All the aforementioned techniques require the use of a tubular molding element and a cardboard retaining tube, between which said wedging elements are arranged, the generally circular retaining tube appearing obligatory to ensure good resistance to compression. interior.

Les inventeurs ont eu le mérite de repenser entièrement la technique et de réaliser un coffrage de fabrication aisée et de très bonne résistance à la compression intérieure.The inventors have had the merit of completely rethinking the technique and producing easy-to-manufacture formwork with very good resistance to internal compression.

Un coffrage selon l'invention comporte de manière connue un élément tubulaire de moulage pourvu de parois planes qui définissent un prisme dont la section droite polygonale correspond à celle du produit fini à mouler, et des éléments de renfort qui viennent recouvrir les faces externes dudit élément tubulaire de moulage et il est remarquable en ce que lesdits éléments de renfort sont maintenus serrés sur l'élément tubulaire par banderolage d'au moins une bande de matériau encollée au moins partiellement sur au moins l'une de ses faces. Le banderolage peut être effectué de plusieurs manières, comme il sera précisé ci-après à propos du procédé.A formwork according to the invention comprises in known manner a tubular molding element provided with flat walls which define a prism whose polygonal cross section corresponds to that of the finished product to be molded, and reinforcing elements which come to cover the external faces of said element. tubular molding and it is remarkable in that said reinforcing elements are held tight on the tubular element by wrapping at least one strip of material glued at least partially on at least one of its faces. The wrapping can be carried out in several ways, as will be explained below with regard to the process.

Dans un coffrage selon l'invention, on comprend que par rapport aux techniques antérieures il n'y a plus de tube de maintien extérieur.In a formwork according to the invention, it is understood that compared to the prior techniques there is no longer an external holding tube.

Selon un mode de réalisation non obligatoire, les éléments de renfort présentent chacun une forme prismatique à section en forme de triangle ou trapèze dont les dimensions de la grande base correspondent à celles de la face extérieure de l'élément tubulaire sur laquelle il est appliqué et dont les angles à la base sont choisis de manière telle que deux faces latérales voisines de deux éléments de renfort successifs sont sensiblement coplanaires.According to a non-compulsory embodiment, the reinforcing elements each have a prismatic shape with a triangular or trapezoidal section whose dimensions of the large base correspond to those of the outer face of the tubular element to which it is applied and the angles of which at the base are chosen such that two adjacent lateral faces of two successive reinforcing elements are substantially coplanar.

Pour des éléments de renfort trapézoïdaux, le banderolage extérieur formera alors une gaine prismatique à 2n faces, n étant le nombre de côtés de la section polygonale de l'élément tubulaire, sans compter les éventuels chanfreins ménagés sur ses arêtes.For trapezoidal reinforcing elements, the external wrapping will then form a prismatic sheath with 2 n faces, n being the number of sides of the polygonal section of the tubular element, without count any chamfers made on its edges.

Dans le cas d'un élément tubulaire de section droite polygonale dont tous les angles au sommet sont égaux, il suffit que la section droite des éléments de renfort soit en forme de triangle ou trapèze isocèle avec des angles à la base égaux chacun à 180° divisisé par n.In the case of a tubular element of polygonal cross section whose all the angles at the top are equal, it suffices that the cross section of the reinforcing elements is in the form of a triangle or isosceles trapezoid with angles at the base each equal to 180 ° divided by n .

Dans le but notamment de fournir un coffrage non polluant et recyclable, qui offre une excellente résistance, l'élément tubulaire de moulage est en carton et les éléments de renfort sont constitués par du carton alvéolaire dont les arêtes de chaque alvéole sont disposées perpendiculairement à la paroi plane en regard de l'élément tubulaire de moulage.In particular with the aim of providing non-polluting and recyclable formwork, which offers excellent resistance, the tubular molding element is made of cardboard and the reinforcing elements are made of cellular cardboard, the edges of each cell of which are arranged perpendicular to the flat wall opposite the tubular molding element.

Si le carton alvéolaire présente l'avantage d'être recyclable et présente une excellente résistance, d'autres matériaux sont évidemment parfaitement envisageables.If the honeycomb has the advantage of being recyclable and has excellent resistance, other materials are obviously perfectly possible.

L'invention concerne aussi un procédé de fabrication d'un tel coffrage qui est remarquable en ce qu'il consiste à:

  • a) former un élément tubulaire prismatique de moulage, dont la section droite correspond à celle du produit fini à mouler,
  • b) découper un matériau de renfort en plusieurs éléments présentant chacun une face de dimensions semblables aux dimensions de l'une des faces principales de l'élément tubulaire prismatique de moulage,
  • c) disposer l'élément tubulaire prismatique sur un mandrin d'enroulement,
  • d) disposer les éléments de renfort sur les faces planes externes correspondantes de l'élément tubulaire,
  • e) procéder à un banderolage de l'ensemble à l'aide d'au moins une bande qui est encollée au moins partiellement sur au moins l'une de ses faces.
The invention also relates to a method of manufacturing such formwork which is remarkable in that it consists in:
  • a) forming a prismatic tubular molding element, the cross section of which corresponds to that of the finished product to be molded,
  • b) cutting a reinforcing material into several elements, each having a face of dimensions similar to the dimensions of one of the main faces of the prismatic tubular molding element,
  • c) placing the prismatic tubular element on a winding mandrel,
  • d) placing the reinforcing elements on the corresponding external flat faces of the tubular element,
  • e) banding the assembly using at least one strip which is at least partially glued on at least one of its faces.

Selon un mode de réalisation, l'élément tubulaire prismatique est fabriqué à partir d'une plaque de carton éventuellement rainurée pour former des chanfreins d'arête et dont la face destinée à constituer l'intérieur du coffrage est traitée pour la rendre étanche. Selon un mode de réalisation, le banderolage est effectué par un enroulement droit sur plusieurs tours au moyen d'au moins une bande de carton dont la largeur correspond à la longueur de l'ensemble à banderoler.According to one embodiment, the prismatic tubular element is manufactured from a cardboard plate possibly grooved to form edge chamfers and the face intended to constitute the interior of the formwork is treated to make it waterproof. According to one embodiment, the wrapping is carried out by a straight winding over several turns by means of at least one strip of cardboard, the width corresponds to the length of the set to be wrapped.

Toutefois, selon une variante, le banderolage est effectué au moyen d'au moins une bande de carton de faible largeur par rapport à la longueur de l'ensemble à banderoler et qui est enroulée en hélice par spiralage.However, according to a variant, the wrapping is carried out by means of at least one strip of cardboard of small width compared to the length of the assembly to be wrapped and which is helically wound by spiraling.

La dernière bande utilisée pour le banderolage peut en outre présenter sur au moins sa face extérieure un traitement pour la rendre étanche afin de former un dernier revêtement étanche, celui-ci pouvant de plus porter des inscriptions publicitaires et/ou explicatives d'un mode d'emploi.The last strip used for the wrapping can furthermore have, on at least its outer face, a treatment to make it waterproof in order to form a last waterproof coating, this moreover being able to carry advertising and / or explanatory inscriptions of a method of 'employment.

De préférence, les éléments de renfort sont réalisés à partir d'une plaque de carton alvéolaire.Preferably, the reinforcing elements are produced from a sheet of cellular cardboard.

Pour concevoir un coffrage du type précité avec des éléments de renfort prismatiques en forme de triangle ou de trapèze, lesdits éléments de renfort sont découpés en conséquence à partir, par exemple, d'une plaque d'un matériau adéquate.To design a formwork of the aforementioned type with prismatic reinforcing elements in the shape of a triangle or trapezoid, said reinforcing elements are cut accordingly from, for example, a plate of a suitable material.

Avantageusement, les éléments de renfort sont maintenus sur les faces extérieures planes de l'élément tubulaire avant banderolage, par collage et/ou par cerclage de bandes adhésives.Advantageously, the reinforcing elements are held on the flat outer faces of the tubular element before wrapping, by gluing and / or by strapping of adhesive strips.

L'invention sera bien comprise et d'autres particularités apparaîtront à la lecture de la description qui va suivre et qui se réfère aux dessins annexés dans lesquels:

  • les figures 1 et 2 montrent respectivement de profil et en perspective, une plaque de carton avant pliage destinée à confectionner l'élément tubulaire de moulage,
  • la figure 3 montre en perspective l'élément tubulaire de moulage quasi-fini,
  • la figure 4 montre de profil une plaque de carton alvéolaire prédécoupée pour former les éléments de renfort,
  • les figures 5, 6 et 7 montrent trois phases successives de fabrication selon un premier mode de réalisation, l'élément tubulaire étant disposé sur un mandrin d'enroulement,
  • la figure 8 montre le produit fini obtenu après les phases de fabrication des figures 5, 6 et 7,
  • les figures 9 et 10 correspondent aux figures 7 et 8 selon un second mode de réalisation.
The invention will be clearly understood and other particularities will appear on reading the description which follows and which refers to the appended drawings in which:
  • FIGS. 1 and 2 show respectively in profile and in perspective, a cardboard plate before folding intended to make up the tubular molding element,
  • FIG. 3 shows in perspective the almost finished tubular molding element,
  • FIG. 4 shows in profile a sheet of pre-cut honeycomb cardboard to form the reinforcing elements,
  • FIGS. 5, 6 and 7 show three successive manufacturing phases according to a first embodiment, the tubular element being disposed on a winding mandrel,
  • FIG. 8 shows the finished product obtained after the manufacturing phases of FIGS. 5, 6 and 7,
  • Figures 9 and 10 correspond to Figures 7 and 8 according to a second embodiment.

Pour fabriquer un coffrage selon l'invention, on réalise d'abord un élément tubulaire prismatique à partir d'une plaque 1, par exemple en carton 3 (figures 1, 2, 3 et 5).To manufacture a formwork according to the invention, a prismatic tubular element is first produced from a plate 1, for example from cardboard 3 (Figures 1, 2, 3 and 5).

Dans l'exemple représenté, l'élément tubulaire 1 prismatique réalisé (figures 3 et 5) présente une section sensiblement en forme de carré (on utilise la même référence 1 pour désigner indifféremment l'élément tubulaire ou la plaque à partir de laquelle il est fabriqué).In the example shown, the prismatic tubular element 1 produced (FIGS. 3 and 5) has a substantially square-shaped section (the same reference 1 is used to designate either the tubular element or the plate from which it is made).

Pour ce faire, la plaque de carton 1 (figures 1 et 2) est rainurée comme le montrent lesdites figures (par des flèches sur la figure 1 et des pointillés sur la figure 2), pour diviser la plaque 1 en quatre parties principales 1a à 1d, destinées à former les quatre parois du prisme (figure 3) après pliage le long des rainures ainsi réalisées.To do this, the cardboard plate 1 (Figures 1 and 2) is grooved as shown in said figures (by arrows in Figure 1 and dotted lines in Figure 2), to divide the plate 1 into four main parts 1 a to 1d, intended to form the four walls of the prism (Figure 3) after folding along the grooves thus produced.

En fait, on peut voir sur les figures que les rainures, à l'exception d'une rainure d'extrémité, sont doubles de façon à former des chanfreins d'arête 2a à 2d (figure 3).In fact, it can be seen in the figures that the grooves, with the exception of an end groove, are double so as to form edge chamfers 2a to 2d (Figure 3).

L'élément tubulaire 1 est fermé par exemple au moyen d'une bande adhésive 3 (figure 4), ou tout autre moyen, qui est ici disposée longitudinalement entre une face principale 1a et un chanfrein 2d.The tubular element 1 is closed for example by means of an adhesive tape 3 (figure 4), or any other means, which is here disposed longitudinally between a main face 1a and a chamfer 2d.

L'élément tubulaire prismatique 1 ainsi réalisé doit en outre présenter les dimensions souhaitées pour le produit fini à mouler.The prismatic tubular element 1 thus produced must also have the desired dimensions for the finished product to be molded.

Une plaque de carton alvéolaire 4 (figure 4) est découpée comme le montre la figure 4 en plusieurs éléments tels que 4a à 4f.A sheet of honeycomb cardboard 4 (Figure 4) is cut as shown in Figure 4 into several elements such as 4a to 4f.

Dans l'exemple représenté, chaque élément 4a à 4f présente une forme prismatique à section trapézoïdale et plus particulièrement en forme de trapèze isocèle dont les angles de la grande base sont de 45°.In the example shown, each element 4a to 4f has a prismatic shape with a trapezoidal section and more particularly in the form of an isosceles trapezium whose angles of the large base are 45 °.

Par ailleurs, les grandes bases de chaque élément prismatique trapézoïdal présentent des dimensions correspondantes à celles des faces 1a à 1d de l'élément tubulaire 1. On comprend qu'un découpage comme représenté sur la figure 4 (à 45° de façon alternée), permet de limiter considérablement les chutes, ce qui constitue une technique particulièrement économique.Furthermore, the large bases of each trapezoidal prismatic element have dimensions corresponding to those of the faces 1 a to 1d of the tubular element 1. It is understood that a cutting as shown in Figure 4 (at 45 ° alternately), can significantly limit falls, which is a particularly economical technique.

Enfin, la face de la plaque 1 destinée à former la face interne dudit élément tubulaire est traitée pour être rendue étanche.Finally, the face of the plate 1 intended to form the internal face of said tubular element is treated to be sealed.

L'élément tubulaire prismatique 1 est ensuite disposé sur un mandrin 5 (figure 5) dont la section correspond à la section intérieure dudit élément 1 (chanfreins compris), ce dernier étant fermé longitudinalement par la bande adhévise 3 avant ou après sa mise en place sur ledit mandrin 5.The prismatic tubular element 1 is then placed on a mandrel 5 (FIG. 5) whose cross section corresponds to the internal cross section of said element 1 (including chamfers), the latter being closed longitudinally by the adhesive strip 3 before or after its positioning on said mandrel 5.

Comme le montrent les figures 5, 6, 7 et 9, le mandrin 5 est expansible à l'aide, par exemple, de coquilles 6a à 6d (figure 5) capables de s'écarter de l'axe dudit mandrin par tout moyen hydraulique et/ou pneumatique et/ou mécanique.As shown in Figures 5, 6, 7 and 9, the mandrel 5 is expandable using, for example, shells 6a to 6d (Figure 5) capable of deviating from the axis of said mandrel by any hydraulic means and / or pneumatic and / or mechanical.

Après mise en place de l'élément tubulaire sur le mandrin, on positionne les éléments de renfort 4a à 4d, comme représenté sur la figure 6, en appliquant les grandes bases desdits éléments sur les faces de l'élément 1.After placing the tubular element on the mandrel, the reinforcing elements 4a to 4d are positioned, as shown in FIG. 6, by applying the large bases of said elements to the faces of element 1.

Comme le montrent bien les figures 6 à 10, les dimensions desdits éléments de renfort 4a à 4d sont telles (angles de base de 45°) que deux faces latérales voisines de deux éléments de renfort successifs sont sensiblement coplanaires.As FIGS. 6 to 10 clearly show, the dimensions of said reinforcing elements 4a to 4d are such (base angles of 45 °) that two lateral faces adjacent to two successive reinforcing elements are substantially coplanar.

Les éléments de renfort 4a à 4d sont maintenus par collage de leurs faces qui sont en contact avec l'élément tubulaire 1 et/ou par cerclage au moyen de bandes adhésives telles que 7a à 7d sur les figures 6, 7 et 9.The reinforcing elements 4a to 4d are held by gluing their faces which are in contact with the tubular element 1 and / or by strapping by means of adhesive strips such as 7a to 7d in FIGS. 6, 7 and 9.

L'opération suivante consiste à effectuer un banderolage comme le montrent les figures 7 et 9.The following operation consists in carrying out a wrapping as shown in Figures 7 and 9.

On banderole l'ensemble représenté à la figure 6 en entraînant en rotation le mandrin 5 et en enroulant au moins une bande de carton 8, 8'. Sur la figure 7, on a représenté un banderolage d'une bande 8 par spiralage, c'est-à-dire par enroulement hélicoïdal.We band the assembly shown in Figure 6 by rotating the mandrel 5 and winding at least one strip of cardboard 8, 8 '. In Figure 7, there is shown a wrapping of a strip 8 by spiraling, that is to say by helical winding.

Le spiralage s'effectue avantageusement en plusieurs couches et éventuellement par couches croisées au moyen d'au moins une bande encollée au moins en partie sur au moins l'une de ses faces (voire ses deux faces). Dans ce cas, la bande 8 utilisée présente évidemment une largeur relativement faible par rapport au produit semi-fini.The spiraling is advantageously carried out in several layers and possibly in crossed layers by means of at least one strip glued at least in part on at least one of its faces (or even its two faces). In this case, the strip 8 used obviously has a relatively small width compared to the semi-finished product.

Toutefois, on peut aussi, comme le montre la figure 9, effectuer un enroulement droit d'au moins une bande 8' enroulée sur plusieurs tours, ladite bande ayant alors une largeur correspondant à la longueur du produit semi-fini.However, it is also possible, as shown in FIG. 9, to carry out a straight winding of at least one strip 8 'wound over several turns, said strip then having a width corresponding to the length of the semi-finished product.

On obtient ainsi un produit fini (après retrait du mandrin) tel que représenté sur les figures 8 et 10, c'est-à-dire que le banderolage forme une gaine extérieure en forme ici d'octogone (régulier ou non selon l'epaisseur choisie pour les éléments de renfort).A finished product is thus obtained (after withdrawal of the mandrel) as shown in Figures 8 and 10, that is to say that the wrapping forms an outer sheath in the form of an octagon here (regular or not depending on the thickness chosen for the reinforcing elements).

Toutefois, il est clair que les éléments de renfort pourraient avoir des formes triangulaires, la gaine qui en résulterait étant alors de section aussi en carré.However, it is clear that the reinforcing elements could have triangular shapes, the resulting sheath then being of section also square.

En outre, si l'élément tubulaire 1 présente ici une section sensiblement carrée, ceci est un cas particulier d'une section rectangulaire et d'une manière plus générale, ladite section est polygonale, régulière ou non.In addition, if the tubular element 1 here has a substantially square section, this is a special case of a rectangular section and more generally, said section is polygonal, regular or not.

Si la section de l'élément tubulaire de moulage peut être ainsi généralisée, celle des éléments de renfort peut être autrement qu'en forme de trapèze ou de triangle, comme par exemple en segment circulaire.If the section of the tubular molding element can be generalized in this way, that of the reinforcing elements can be other than in the form of a trapezoid or triangle, as for example in a circular segment.

En outre, il n'est pas obligé que les faces latérales voisines des éléments de renfort soient coplanaires.In addition, it is not necessary that the adjacent side faces of the reinforcing elements be coplanar.

Enfin, bien sûr, des finitions peuvent et/ou doivent être apportées, comme une dernière bande de banderolage étanche (éventuellement sur un seul tour pour un enroulement droit et sur un seul pli pour le spiralage), un traitement d'étanchéité des extrémités, des impressions sur la face extérieure de la dernière bande, etc.Finally, of course, finishes can and / or must be made, such as a last waterproof wrapping band (possibly on a single turn for a straight winding and on a single fold for spiraling), a sealing treatment for the ends, prints on the outside of the last strip, etc.

Un tel coffrage permet de supporter de manière surprenante de fortes contraintes, ce qui est évidemment souhaité pour le moulage de poteaux ou piliers en béton.Such formwork can surprisingly withstand high stresses, which is obviously desired for molding concrete posts or pillars.

Claims (11)

1) Coffrage comportant un élément tubulaire (1) de moulage pourvu de parois planes (1a-1d) qui définissent un prisme dont la section droite polygonale correspond à celle du produit fini à mouler, et des éléments de renfort (4a-4d) qui viennent recouvrir les faces externes dudit élément tubulaire de moulage, caractérisé en ce que lesdits éléments de renfort (4a-4d) sont maintenus serrés sur l'élément tubulaire par banderolage hélicoïdal d'au moins une bande (8,8') de matériau encollée au moins partiellement sur au moins l'une de ses faces. 1) Formwork comprising a tubular molding element (1) provided with flat walls (1a-1d) which define a prism whose polygonal cross section corresponds to that of the finished product to be molded, and reinforcing elements (4a-4d) which cover the external faces of said tubular molding element, characterized in that said reinforcing elements (4a-4d) are held tight on the tubular element by helical wrapping with at least one strip (8.8 ') of glued material at least partially on at least one of its faces. 2) Coffrage selon la revendication 1, caractérisé en ce que les éléments de renfort présentent chacun une forme prismatique à section en forme de triangle ou trapèze dont les dimensions de la grande base correspondent à celles de la face extérieure (1a-1d) de l'élément tubulaire (1) sur laquelle il est appliqué et dont les angles à la base sont choisis de manière telle que deux faces latérales voisines de deux éléments de renfort successifs sont sensiblement coplanaires. 2) Formwork according to claim 1, characterized in that the reinforcing elements each have a prismatic section in the form of a triangle or trapezoid whose dimensions of the large base correspond to those of the outer face (1a-1d) of the 'tubular element (1) on which it is applied and whose angles at the base are chosen so that two adjacent side faces of two successive reinforcing elements are substantially coplanar. 3) Coffrage selon l'une des revendications 1 et 2, caractérisé en ce que l'élément tubulaire (1) de moulage est en carton et en ce que les éléments de renfort (4a-4d) sont constitués par du carton alvéolaire dont les arêtes de chaque alvéole sont disposées perpendiculairement à la paroi plane en regard de l'élément tubulaire de moulage. 3) Formwork according to one of claims 1 and 2, characterized in that the tubular element (1) of molding is made of cardboard and in that the reinforcing elements (4a-4d) consist of cellular cardboard whose edges of each cell are arranged perpendicular to the flat wall opposite the tubular molding element. 4) Procédé de fabrication d'un coffrage en carton, caractérisé en ce qu'il consiste à: a) former un élément tubulaire prismatique (1) de moulage, dont la section droite correspond à celle du produit fini à mouler, b) découper un matériau de renfort (4) en plusieurs éléments (4a-4d) présentant chacun une face de dimensions semblables aux dimensions de l'une des faces principales de l'élément tubulaire prismatique (1) de moulage, c) disposer l'élément tubulaire prismatique (1) sur un mandrin d'enroulement (5), d) disposer les éléments de renfort (4a-4d) sur les faces planes externes correspondantes de l'élément tubulaire, e) procéder à un banderolage de l'ensemble à l'aide d'au moins une bande (8,8') qui est encollée au moins partiellement sur au moins l'une de ses faces. 4) Method for manufacturing a cardboard formwork, characterized in that it consists of: a) forming a prismatic tubular molding element (1), the cross section of which corresponds to that of the finished product to be molded, b) cutting a reinforcing material (4) into several elements (4a-4d) each having a face of dimensions similar to the dimensions of one of the main faces of the prismatic tubular element (1) for molding, c) placing the prismatic tubular element (1) on a winding mandrel (5), d) arrange the reinforcing elements (4a-4d) on the faces corresponding external planes of the tubular element, e) banding the assembly with at least one strip (8.8 ') which is at least partially glued on at least one of its faces. 5) Procédé selon la revendication 4, caractérisé en ce que l'élément tubulaire prismatique est fabriqué à partir d'une plaque de carton (1) éventuellement rainurée pour former des chanfreins d'arête et dont la face destinée à constituer l'intérieur du coffrage est traitée pour la rendre étanche. 5) Method according to claim 4, characterized in that the prismatic tubular element is made from a cardboard plate (1) possibly grooved to form edge chamfers and whose face intended to constitute the interior of the formwork is treated to make it waterproof. 6) Procédé selon l'une des revendications 4 et 5, caractérisé en ce que le banderolage est effectué par un enroulement droit sur plusieurs tours d'au moins une bande (8) de carton dont la largeur correspond à la longueur de l'ensemble à banderoler. 6) Method according to one of claims 4 and 5, characterized in that the wrapping is carried out by a straight winding over several turns of at least one strip (8) of cardboard whose width corresponds to the length of the assembly to bandage. 7) Procédé selon l'une des revendications 4 et 5, caractérisé en ce que le banderolage est effectué au moyen d'au moins une bande de carton (8) de faible largeur par rapport à la longueur de l'ensemble à banderoler et qui est enroulée en hélice par spiralage. 7) Method according to one of claims 4 and 5, characterized in that the wrapping is carried out by means of at least one strip of cardboard (8) of small width compared to the length of the assembly to be wrapped and which is wound in a helix by spiraling. 8) Procédé selon l'une des revendications 4 à 7, caractérisé en ce que la dernière bande utilisée pour le banderolage présente sur au moins sa face extérieure un traitement pour la rendre étanche afin de former un dernier revêtement étanche. 8) Method according to one of claims 4 to 7, characterized in that the last strip used for the wrapping has on at least its outer face a treatment to make it waterproof in order to form a last waterproof coating. 9) Procédé selon l'une des revendications 4 à 8, caractérisé en ce que les éléments de renfort (4a-4d) sont réalisés à partir d'une plaque (4) de carton alvéolaire. 9) Method according to one of claims 4 to 8, characterized in that the reinforcing elements (4a-4d) are made from a plate (4) of cellular cardboard. 10) Procédé selon l'une des revendications 4 à 9, caractérisé en ce que les éléments de renfort (4a-4d) sont découpés de manière à présenter chacun une forme prismatique à section en forme de triangle ou trapèze dont les dimensions de la grande base correspondent à celles de la face extérieure (1a-1d) de l'élément tubulaire (1) sur laquelle il est appliqué et dont les angles à la base sont choisis de manière telle que deux faces latérales voisines de deux éléments de renfort successifs sont sensiblement coplanaires. 10) Method according to one of claims 4 to 9, characterized in that the reinforcing elements (4a-4d) are cut so as to each have a prismatic shape with a section in the shape of a triangle or trapezoid whose dimensions of the large base correspond to those of the external face (1a-1d) of the tubular element (1) on which it is applied and the angles of which at the base are chosen so that two adjacent lateral faces of two successive reinforcing elements are substantially coplanar. 11) Procédé selon l'une des revendications 4 à 10, caractérisé en ce que les éléments de renfort (4a-4d) sont maintenus sur les faces extérieures planes (1a-1d) de l'élément tubulaire (1) avant banderolage, par collage et/ou par cerclage de bandes adhésives (7a-7d). 11) Method according to one of claims 4 to 10, characterized in that the reinforcing elements (4a-4d) are maintained on the flat outer faces (1a-1d) of the tubular element (1) before wrapping, by bonding and / or strapping of adhesive strips (7a-7d).
EP93402520A 1992-10-13 1993-10-13 Shuttering and method of production Withdrawn EP0595679A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9212203A FR2696772A1 (en) 1992-10-13 1992-10-13 Formwork and its manufacturing process.
FR9212203 1992-10-13

Publications (1)

Publication Number Publication Date
EP0595679A1 true EP0595679A1 (en) 1994-05-04

Family

ID=9434467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402520A Withdrawn EP0595679A1 (en) 1992-10-13 1993-10-13 Shuttering and method of production

Country Status (4)

Country Link
EP (1) EP0595679A1 (en)
CA (1) CA2108336A1 (en)
FR (1) FR2696772A1 (en)
NO (1) NO933676L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2164037A1 (en) * 1999-02-05 2002-03-16 Salinas Jose Manuel Valero Improvements in disposable casings for cylindrical columns
ES2170020A1 (en) * 2000-11-02 2002-07-16 Salinas Jose Manuel Valero Formwork for cylindrical columns using narrow laminae of plastified wood or rigid plastic
US7874540B2 (en) 2007-06-27 2011-01-25 Sonoco Development, Inc. Concrete form for pouring non-round columns, and method of making same
US20130037979A1 (en) * 2011-08-09 2013-02-14 D & L Innovations, Inc. Systems and methods for forming concrete footings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2246173B1 (en) * 2004-07-30 2006-10-01 Jose Manuel Valero, S.L. REUSABLE FORMWORK FOR COLUMNS AND MACHINE FOR THE ELABORATION OF THE SAME.
ES2315168B1 (en) * 2007-04-20 2010-01-05 Procoro Del Real Lopez FOLDING FORMWORK FOR OBTAINING SQUARE SECTION PILLARS.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913032A (en) * 1961-06-24 1962-12-12 Sonoco Products Co Improvements in forms for moulding concrete columns
US3301926A (en) * 1964-04-08 1967-01-31 Gateway Erectors Inc Method of fabricating a self-braced concrete form
FR1513315A (en) * 1966-09-20 1968-02-16 Cardboard formwork for columns or any other piece of circular or polygonal section
EP0068873A2 (en) * 1981-06-26 1983-01-05 Quinton &amp; Kaines (Holdings) Limited Composite boards and panels
WO1988003590A1 (en) * 1986-11-14 1988-05-19 Sofratube R C T (S.A.) Tubular mould for a rectilinear component or cavity, of non-circular cross-section, particularly for moulding concrete
FR2628465A1 (en) * 1988-03-14 1989-09-15 Servoz Gavin Maurice Disposable shuttering for concrete pillar - comprises two quadrilateral tubes folded from flat sheet material arranged one within other with intermediate plastics stiffeners
DE9014214U1 (en) * 1990-10-12 1991-01-10 Construmat Ag, Hegnau-Volketswil Formwork element for concrete columns

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913032A (en) * 1961-06-24 1962-12-12 Sonoco Products Co Improvements in forms for moulding concrete columns
US3301926A (en) * 1964-04-08 1967-01-31 Gateway Erectors Inc Method of fabricating a self-braced concrete form
FR1513315A (en) * 1966-09-20 1968-02-16 Cardboard formwork for columns or any other piece of circular or polygonal section
EP0068873A2 (en) * 1981-06-26 1983-01-05 Quinton &amp; Kaines (Holdings) Limited Composite boards and panels
WO1988003590A1 (en) * 1986-11-14 1988-05-19 Sofratube R C T (S.A.) Tubular mould for a rectilinear component or cavity, of non-circular cross-section, particularly for moulding concrete
FR2628465A1 (en) * 1988-03-14 1989-09-15 Servoz Gavin Maurice Disposable shuttering for concrete pillar - comprises two quadrilateral tubes folded from flat sheet material arranged one within other with intermediate plastics stiffeners
DE9014214U1 (en) * 1990-10-12 1991-01-10 Construmat Ag, Hegnau-Volketswil Formwork element for concrete columns

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2164037A1 (en) * 1999-02-05 2002-03-16 Salinas Jose Manuel Valero Improvements in disposable casings for cylindrical columns
ES2170020A1 (en) * 2000-11-02 2002-07-16 Salinas Jose Manuel Valero Formwork for cylindrical columns using narrow laminae of plastified wood or rigid plastic
US7874540B2 (en) 2007-06-27 2011-01-25 Sonoco Development, Inc. Concrete form for pouring non-round columns, and method of making same
US20130037979A1 (en) * 2011-08-09 2013-02-14 D & L Innovations, Inc. Systems and methods for forming concrete footings
US9376826B2 (en) * 2011-08-09 2016-06-28 D & L Innovations, Inc. Form sleeve for forming concrete footings

Also Published As

Publication number Publication date
NO933676D0 (en) 1993-10-12
FR2696772A1 (en) 1994-04-15
NO933676L (en) 1994-04-14
CA2108336A1 (en) 1994-04-14

Similar Documents

Publication Publication Date Title
EP0231978B1 (en) Building block and construction made by the use thereof
CH462712A (en) Packaging for revolution object
EP0595679A1 (en) Shuttering and method of production
FR2948342A1 (en) Insulated casing for storing and transporting e.g. food product, has external envelope adhered with internal envelopes of cover, base and wall by insert, where internal envelopes are formed from single piece made of metalized foam sheet
FR2690870A1 (en) Honeycomb sandwich panel bending procedure - includes steps of bending honeycomb layer and inner and outer skins separately before sticking together
FR2684124A1 (en) Cardboard formwork and method for manufacturing it
FR2941983A1 (en) Caisson for protective box for installing connecting rods between parts or concrete elements during reinforced concrete construction of building, has rail whose bottom is provided with throat to avoid sinking of central band of folded sheet
FR2676994A1 (en) Light loading platform for the transport of goods
EP0290544A1 (en) Tubular mould for a rectilinear component or cavity, of non-circular cross-section, particularly for moulding concrete
FR2844817A1 (en) Shuttering element has cellular core with full semi-rigid covering on one side and in sections on other allowing it to be folded
BE1003596A3 (en) Reel in plastic.
FR2606813A1 (en) Tubular mould for a rectilinear pocket or element of non-circular cross-section, particularly for casting concrete using formwork
EP0668218A1 (en) Container for the packaging of objects of various sizes
FR2637933A1 (en) Stackable shuttering block made of lightweight material, and method of casting this block
EP0004518B1 (en) Metallic thermal insulator especially for nuclear installations
FR2861699A1 (en) Pallet structure for transportation and handling of load, has rigidity panels connected at edge contacting lower horizontal wall, each comprising side with edge arranged at intersection of upper horizontal wall with respective lateral wall
FR2647606A1 (en) DEVICE FOR ISOLATING THE STATOR OF AN ELECTRIC MOTOR
CH447019A (en) Expanded plastic packaging
FR2616469A1 (en) Tubular mould for a rectilinear element of non-circular crosssection, particularly for casting concrete using formwork
FR2861768A1 (en) POLYSTYRENE HOURDIS AND PROCESS FOR PRODUCING THE SAME
EP3315681A1 (en) Method for manufacturing a hollow element
BE1005714A3 (en) Facing panel with one visible natural stone surface, and its process ofmanufacture
FR2914582A1 (en) Composite slab for e.g. building field, has space grid provided with tubular elements that are in contact and fixed to each other by their walls, where elements are arranged between cover plates that are fixed on end sectors of elements
FR2490536A1 (en) Method of making veneer covering for curved furniture - involves sticking bands of laminate together in split modules of suitable dimensions
EP0941942A1 (en) Packaging for a flexible tubular element

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI NL

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19941105