EP0799950B1 - Formwork system with adjustable curvature - Google Patents

Formwork system with adjustable curvature Download PDF

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Publication number
EP0799950B1
EP0799950B1 EP97420055A EP97420055A EP0799950B1 EP 0799950 B1 EP0799950 B1 EP 0799950B1 EP 97420055 A EP97420055 A EP 97420055A EP 97420055 A EP97420055 A EP 97420055A EP 0799950 B1 EP0799950 B1 EP 0799950B1
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EP
European Patent Office
Prior art keywords
formwork
sheet
curvature
bending
beams
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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.)
Expired - Lifetime
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EP97420055A
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German (de)
French (fr)
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EP0799950A1 (en
Inventor
Gilles Four
Joel Four
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EUROBRESS Sarl
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EUROBRESS Sarl
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Publication of EP0799950A1 publication Critical patent/EP0799950A1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/062—Forms for curved walls

Definitions

  • the present invention relates to a formwork device with a radius of curvature adjustable, especially for concrete structures.
  • Concrete structures are produced by placing formwork which delimit a volume having the shape of the desired final profile in which the concrete.
  • the panels formwork In the construction of vertical flat walls of constant thickness, the panels formwork include two parallel faces supported by a rigid frame of so as to take up the pressure forces of the poured concrete.
  • each formwork panel is made from a metal sheet or in some cases using plywood sheets.
  • Existing formwork devices include panels with a radius of predetermined curvature, on which plywood plates are mounted.
  • wood as a formwork panel does not lead to a surface finish sufficiently smooth and free from defects to be used as it is in wall constructions with curved profile.
  • Geometric defects are caused by the fact that the plywood bends but that it nevertheless undergoes, as it is used, wear which comes increase surface defects.
  • the plywood must be very thick to support the pressures of poured concrete resulting in visible facets upon removal of the formwork.
  • Solutions have been envisaged by combining, for example, formwork sheets metal with an articulated frame so that the radius of curvature of the two facing sheets facing each other.
  • Such a device includes regularly spaced vertical holding beams along generators of the bending sheet.
  • the support beams have V or Omega profiles whose ends are joined to the formwork sheets by welding or screwing.
  • the profile of the support beams leads to an excellent connection with the sheet metal. formwork over a large area and thus completely stiffening the connection.
  • the beams are connected in pairs using profiles which are themselves joined between them by traction or compression cylinders. So by acting by compression or pulling the cylinders, we get a rimpedement or a distance of the beams one of the other thus giving the formwork sheet a radius of curvature.
  • the formwork device comprises a first and a second sheet metal integral respectively a first and a second set of support beams which are regularly spaced along generators.
  • the formwork device comprises means for adjusting the spacing of the plates connecting the beams together and allowing the bending of the sheets.
  • the object of the invention is to propose a formwork device with a radius of curvature adjustable which is easy to set up on construction sites, and which has a longevity very important.
  • the formwork device according to the invention must not be fragile during transport, and must make it possible to produce a finished product after formwork removal great quality for rough use.
  • the formwork device comprises a formwork sheet attached to a set of regularly spaced holding beams along generators, length adjustment means extending transversely to the beams and connecting these and at least one bending template cut to a determined radius of curvature, the bending template is pressed against the formwork sheet by first means of clamping which are arranged inside the beams for maintaining the beam clearance and by second clamping means which are integral with a beam fixed on the sheet metal formwork, while the adjustment means are provided to deform the sheet metal formwork, either along the radius of curvature of the bending template, or according to different radii of curvature, but included in the elastic deformation of said jigs.
  • the formwork device comprises a bending template in its upper part and in its lower part.
  • the particular arrangement of the support beams allows to have inside these clamping means for applying the bending template against the sheet metal formwork.
  • FIG. 1 and 2 show a formwork device 1 with adjustable radius of curvature for concrete structures.
  • the formwork device 1 is shown in the position of rest i.e. before bending.
  • the beams 30 to 33 are regularly spaced over the width of the formwork sheet 2. It is noted that the holding beams 30 to 33 are arranged along generatrices parallel over the entire height of the shuttering sheet 2.
  • the beams 30 to 33 have a V-shaped profile with a truncated point, the free ends of the two branches 34, 35 are respectively extended by a parallel segment 36, 37 which is welded to the shuttering sheet 2.
  • the beams 30 to 33 are interconnected by length adjustment means extending transversely to said beams and connecting these two by two in the upper and lower part of the formwork device 1.
  • the beams 30 and 31 are connected by two parallel angles 4, while the beams 32 and 33 are connected by two parallel angles 5.
  • the angles 4 and 5 of the formwork device 1 are connected to each other by screw jacks 6 which are either separated or tightened according to the radius of curvature of bending that the formwork device 1 must have.
  • the angles 4 and 5 each comprise at least one oblong opening 40.50 in which cooperate fixing means 38 with the corresponding beam for allow the bending of the formwork device 1 as will be seen better below.
  • angles 4 and 5 are connected opposite to each screw jack 6 at the shuttering sheet 2 by screw jacks 7 which improve the adjustment of the radius of curvature of said formwork sheet at its free ends.
  • the formwork device 1 comprises reinforcing beams 11 parallel to the beams 30 to 33.
  • the longitudinal members 11 are fixed over the entire height of the shuttering sheet 2 and to free ends of the latter.
  • FIGS. 3 and 4 show clamping means 8 which are arranged at the inside of each beam 30 to 33, of the formwork device 1 for positioning a bending jig 10.
  • the clamping means 8 are provided at each end beams 30 to 33, that is to say in the upper and lower part of the device formwork 1.
  • the latter has a head 84 with a conical bearing which is housed in a washer 86 of the same profile.
  • the washer 86 is welded to the truncated part of the V-shaped profile of each beam 30 to 33.
  • the sleeve 81 is integral with a first tubular element 87 which cooperates coaxially with the internal part of a second element 88 of the same profile.
  • the second element 88 is welded to a plate 89 which comes to bear on the washer 86 at conical bearing.
  • the screw 83 comprises coaxially to its body a skirt 85 which comes in stop against the plate 89 to prevent the removal of said screw 83.
  • FIG 5 there is shown another clamping means 9 which is arranged at the same level as the clamping means 8 but near the beams 30 and 35 and in the upper and lower part of the formwork device 1.
  • Each clamping means 9 consists of a tubular sleeve with square section or circular 90 which is fixed to the reinforcing beam 11 secured to the shuttering sheet 2.
  • a nut 92 Inside the sleeve 90 is welded a nut 92 which cooperates with a screw 93.
  • the head 94 of the screw 93 has a conical bearing which comes to bear on a washer 95 with an additional internal profile.
  • the washer 95 and welded to a support plate 96 which is integral with a sleeve 97 of the same profile as that 90 in order to penetrate inside the latter.
  • Screw 93 is integral with a stop 98 which prevents its withdrawal by coming to take support against the washer 95.
  • the clamping means 9 makes it possible to retain the bending jig 10 against the sheet of formwork 2 via the plate 96 when the screw 93 is actuated in rotation.
  • a clamping means 9 is provided at each corner of the formwork device 1.
  • the adjustment means 4, 5, 6, 7 make it possible to perform a pre-bending of the formwork 1 and more particularly formwork sheet 2. Pre-bending is carried out simultaneously in the upper and lower part of the formwork device 1.
  • the bending jig 10 made either of wood or of plastic such that polyethylene is nylon.
  • the bending template 10 is cut to a radius of determined curvature.
  • the bending jig 10 is arranged in the upper and lower part of the device formwork 1. Thus, each bending jig 10 is retained against the sheet metal formwork 2 by means of the clamping means 8 provided in each beam 30 to 33.
  • each bending jig 10 is held at the ends of the device formwork 1 by means of clamping means 9 which allow to press said template against the formwork sheet 2.
  • the adjustment means 4, 5, 6 and 7 are adjusted in order to perfectly deform the shuttering sheet 2 either within the radius of curvature of the bending jigs 10, ie at different radii of curvature but included in the elastic deformation of said templates.
  • formwork devices 1 can be arranged next to each other and one above the other to form, for example, a wall with a curved profile.
  • a central groove in which is arranged a seal, to prevent the flow of milt contained in concrete.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Vehicle Body Suspensions (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Sanitary Device For Flush Toilet (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The shuttering panel, especially for concrete structures, consists of a metal sheet (2) equipped with a series of regularly-spaced lengthwise supporting beams and transverse templates (1), e.g. at the top and bottom, to vary the curvature of the metal sheet. The templates are pressed against the surface of the metal sheet by fastenings (8) and adjusted by means of regulating elements (4, 5, 6, 7). The templates can be made from wood, plastic or nylon, and each one has a central groove for a seal.

Description

La présente invention a pour objet un dispositif de coffrage à rayon de courbure réglable, notamment pour les ouvrages en béton.The present invention relates to a formwork device with a radius of curvature adjustable, especially for concrete structures.

La réalisation des ouvrages en béton s'effectue par leur mise en place de coffrages qui délimitent un volume ayant la forme du profil final recherché dans lequel est coulé le béton.Concrete structures are produced by placing formwork which delimit a volume having the shape of the desired final profile in which the concrete.

Dans la construction de murs plans verticaux et d'épaisseur constante, les panneaux de coffrage comprennent deux faces parallèles soutenues par une ossature rigide de façon à reprendre les efforts de pressions du béton coulé.In the construction of vertical flat walls of constant thickness, the panels formwork include two parallel faces supported by a rigid frame of so as to take up the pressure forces of the poured concrete.

La face de chaque panneau de coffrage est réalisée à partir d'une tôle métallique ou dans certains cas à l'aide de plaques de contreplaqué.The face of each formwork panel is made from a metal sheet or in some cases using plywood sheets.

Un problème se pose lorsqu'il s'agit de réaliser la construction de murs à profil courbe. Les dispositifs de coffrage existants comprennent des panneaux ayant un rayon de courbure prédéterminé, sur lesquels sont montées des plaques en contreplaqué.A problem arises when it comes to constructing walls with a curved profile. Existing formwork devices include panels with a radius of predetermined curvature, on which plywood plates are mounted.

De tels dispositifs ne sont pas satisfaisant car le contreplaqué s'use vite et il faut le remplacer régulièrement ce qui représente un temps d'immobilisation important et un coût non moins important.Such devices are not satisfactory because the plywood wears out quickly and it must be replace regularly which represents a significant downtime and a no less important cost.

Par ailleurs, de nombreuses constructions utilisent des murs en béton brut et il convient que l'état de surface de la peau extérieure constituée soit par la tôle métallique, soit par les plaques de contreplaqué du dispositif de coffrage soit aussi parfait que possible.In addition, many constructions use raw concrete walls and it is advisable that the surface condition of the outer skin constituted either by the metal sheet or by the plywood plates of the formwork device is as perfect as possible.

L'utilisation du bois comme panneau de coffrage ne conduit pas à un état de surface suffisamment lisse et exempt de défauts pour être utilisé tel quel dans des constructions de mûrs à profil courbe.The use of wood as a formwork panel does not lead to a surface finish sufficiently smooth and free from defects to be used as it is in wall constructions with curved profile.

Les défauts géométriques sont engendrés par le fait que le contreplaqué se courbe mais qu'il subit néanmoins, au fur et à mesure de son utilisation une usure qui vient augmenter les défauts de surface.Geometric defects are caused by the fact that the plywood bends but that it nevertheless undergoes, as it is used, wear which comes increase surface defects.

De plus, le contreplaqué doit être d'une épaisseur importante pour supporter les pressions du béton coulé ayant pour conséquence de provoquer des facettes visibles dès le retrait du coffrage.In addition, the plywood must be very thick to support the pressures of poured concrete resulting in visible facets upon removal of the formwork.

Des solutions ont été envisagées en associant par exemple des tôles de coffrage métallique avec un châssis articulé de façon à pouvoir régler le rayon de courbure des deux tôles de coffrage en vis à vis.Solutions have been envisaged by combining, for example, formwork sheets metal with an articulated frame so that the radius of curvature of the two facing sheets facing each other.

Un tel dispositif comprend des poutres de maintien vertical régulièrement espacées suivant des génératrices de la tôle à courber.Such a device includes regularly spaced vertical holding beams along generators of the bending sheet.

Les poutres de maintien présentent des profils en V ou en Oméga dont les extrémités sont solidarisées sur les tôles de coffrage par soudure ou vissage. The support beams have V or Omega profiles whose ends are joined to the formwork sheets by welding or screwing.

Le profil des poutres de maintien conduit à une excellente liaison avec la tôle de coffrage sur une grande surface et rigidifiant ainsi totalement la liaison.The profile of the support beams leads to an excellent connection with the sheet metal. formwork over a large area and thus completely stiffening the connection.

Les poutres sont reliées par paires à l'aide de profilés qui sont eux-mêmes réunis entre eux par des vérins de traction ou de compression. Ainsi, en agissant par compression ou traction des vérins, on obtient un rapprochement ou un éloignement des poutres les unes des autres conférant ainsi à la tôle de coffrage un rayon de courbure.The beams are connected in pairs using profiles which are themselves joined between them by traction or compression cylinders. So by acting by compression or pulling the cylinders, we get a rapprochement or a distance of the beams one of the other thus giving the formwork sheet a radius of curvature.

Cette réalisation présente des inconvénients, car les liaisons étant parfaitement fixes, on s'aperçoit que la tôle de coffrage est conformée suivant un rayon de courbure qui n'est pas uniforme et présente de nombreuses facettes au droit de chacune des poutres.This embodiment has drawbacks, because the connections being perfectly fixed, we can see that the formwork sheet is shaped according to a radius of curvature which is not uniform and has many facets to the right of each of the beams.

Afin de diminuer cet effet inopportun, une solution consiste à multiplier le nombre de poutres, mais outre que le fait que le coût augmente, la mise en place et le réglage du rayon de courbure devient très délicat.In order to reduce this undesirable effect, one solution consists in multiplying the number of beams, but in addition to the fact that the cost increases, the installation and adjustment of the radius of curvature becomes very delicate.

Une autre conséquence directe de l'utilisation d'une tôle de coffrage métallique solidaire d'un grand nombre de poutres est que le rayon minimal de courbure reste trop élevé pour les besoins des utilisateurs.Another direct consequence of the use of a metal formwork sheet attached to a large number of beams is that the minimum radius of curvature remains too high for user needs.

On connaít par le brevet français n° FR-A-2 711 705, un dispositif de coffrage à rayon de courbure réglable pour les ouvrages en béton.We know from French patent No. FR-A-2 711 705, a formwork device with a radius of adjustable curvature for concrete structures.

Le dispositif de coffrage comporte une première et une seconde tôle solidaires respectivement d'un premier et d'un second jeux de poutres de maintien qui sont régulièrement espacées suivant des génératrices.The formwork device comprises a first and a second sheet metal integral respectively a first and a second set of support beams which are regularly spaced along generators.

Le dispositif de coffrage comporte des moyens de réglage de l'écartement des plaques reliant entre elles les poutres et permettant le cintrage des tôles.The formwork device comprises means for adjusting the spacing of the plates connecting the beams together and allowing the bending of the sheets.

Pour permettre le cintrage des tôles, il est prévu un gabarit de cintrage découpé dans une tôle dont le rayon de courbure est identique à celui auquel le dispositif de coffrage doit être amené.To allow the bending of the sheets, a bending template is cut out from a sheet whose radius of curvature is identical to that at which the formwork device must be brought.

Il est également prévu un gabarit pour chaque rayon qui est fixé sur les poutres en partie supérieure de celles-ci.A template is also provided for each radius which is fixed to the beams upper part of these.

C'est à ces inconvénients qu'entend plus particulièrement remédier la présente invention.It is these drawbacks that the present invention intends to remedy more particularly. invention.

Le but de l'invention est de proposer un dispositif de coffrage à rayon de courbure réglable qui soit aisé à mettre en place sur les chantiers, et qui présente une longévité très importante. Le dispositif de coffrage suivant l'invention ne doit pas être fragile durant le transport, et doit permettre de réaliser un produit fini après décoffrage de grande qualité pour une utilisation brute.The object of the invention is to propose a formwork device with a radius of curvature adjustable which is easy to set up on construction sites, and which has a longevity very important. The formwork device according to the invention must not be fragile during transport, and must make it possible to produce a finished product after formwork removal great quality for rough use.

A cet effet, le dispositif de coffrage selon l'invention comprend une tôle de coffrage solidaire d'un jeu de poutres de maintien régulièrement espacées suivant des génératrices, des moyens de réglages en longueur s'étendant transversalement aux poutres et reliant celles-ci et au moins un gabarit de cintrage découpé à un rayon de courbure déterminé, le gabarit de cintrage est plaqué contre la tôle de coffrage par des premiers moyens de serrage qui sont disposés à l'intérieur des poutres de maintien du jeu de poutre et par des second moyens de serrage qui sont solidaire d'un longeron fixé sur la tôle de coffrage, tandis que les moyens de réglage sont prévus pour déformer la tôle de coffrage, soit suivant le rayon de courbure du gabarit de cintrage, soit suivant des rayons de courbures différents, mais compris dans la déformation élastique desdits gabarits.To this end, the formwork device according to the invention comprises a formwork sheet attached to a set of regularly spaced holding beams along generators, length adjustment means extending transversely to the beams and connecting these and at least one bending template cut to a determined radius of curvature, the bending template is pressed against the formwork sheet by first means of clamping which are arranged inside the beams for maintaining the beam clearance and by second clamping means which are integral with a beam fixed on the sheet metal formwork, while the adjustment means are provided to deform the sheet metal formwork, either along the radius of curvature of the bending template, or according to different radii of curvature, but included in the elastic deformation of said jigs.

Selon une autre caractéristique de l'invention, le dispositif de coffrage comprend un gabarit de cintrage dans sa partie supérieure et dans sa partie inférieure.According to another characteristic of the invention, the formwork device comprises a bending template in its upper part and in its lower part.

L'agencement particulier des poutres de maintien permet de disposer à l'intérieur de celles-ci des moyens de serrage pour appliquer le gabarit de cintrage contre la tôle de coffrage.The particular arrangement of the support beams allows to have inside these clamping means for applying the bending template against the sheet metal formwork.

Le procédé pour la mise en oeuvre du dispositif de coffrage consiste :

  • à pré-cintrer une tôle de coffrage solidaire suivant ses génératrices de poutres de maintien par l'intermédiaire de moyens de réglages tel quel des vérins à vis,
  • à plaquer un gabarit de cintrage présentant un rayon de courbure déterminé dans la partie supérieure et inférieure du dispositif de coffrage,
  • à agir sur des moyens de serrage prévus respectivement dans chaque poutre de maintien et sur un longeron pour plaquer les gabarits de cintrage contre la tôle de coffrage,
  • et à actionner les moyens de réglages pour cintrer la tôle de coffrage soit au rayon de courbure des gabarits de cintrage, soit à des rayons de courbures différents mais compris dans la déformation élastique des gabarits de cintrage.
The method for implementing the formwork device consists of:
  • pre-bending a formwork sheet integral with its generators of holding beams by means of adjustment means such as screw jacks,
  • applying a bending template having a determined radius of curvature in the upper and lower part of the formwork device,
  • acting on the clamping means provided respectively in each retaining beam and on a beam to press the bending jigs against the formwork sheet,
  • and actuating the adjustment means for bending the shuttering sheet either to the radius of curvature of the bending jigs, or to different radii of curvature but included in the elastic deformation of the bending jigs.

Le dispositif de coffrage selon l'invention est décrit en détail ci-après et cette description comprend des références figurant aux différentes figures des planches de dessins annexées, qui représente :

  • la figure 1 est une vue de face schématique du dispositif de coffrage selon l'invention avec les poutres de maintien et les moyens réglables,
  • la figure 2 est une coupe suivant A-A de la figure 1, montrant le dispositif de coffrage avant son cintrage,
  • la figure 3 est une vue semblable à celle de la figure 2 illustrant le dispositif de coffrage en position cintrée,
  • la figure 4 est une vue en détail illustrant des moyens de serrage pour plaquer le gabarit de cintrage contre la tôle de coffrage,
  • la figure 5 est une coupe représentant d'autres moyens de serrage prévus à chaque extrémité de la tôle de coffrage,
  • la figure 6 est une vue de dessus montrant deux dispositifs de cintrage associés.
The shuttering device according to the invention is described in detail below and this description includes references appearing in the various figures of the sheets of attached drawings, which represents:
  • FIG. 1 is a schematic front view of the formwork device according to the invention with the holding beams and the adjustable means,
  • FIG. 2 is a section along AA in FIG. 1, showing the shuttering device before it is bent,
  • FIG. 3 is a view similar to that of FIG. 2 illustrating the shuttering device in the bent position,
  • FIG. 4 is a detailed view illustrating clamping means for pressing the bending jig against the formwork sheet,
  • FIG. 5 is a section showing other clamping means provided at each end of the formwork sheet,
  • Figure 6 is a top view showing two associated bending devices.

On a montré en figure 1 et 2 un dispositif de coffrage 1 à rayon de courbure réglable pour des ouvrages en béton. Le dispositif de coffrage 1 est représenté en position de repos c'est-à-dire avant cintrage.FIG. 1 and 2 show a formwork device 1 with adjustable radius of curvature for concrete structures. The formwork device 1 is shown in the position of rest i.e. before bending.

Le dispositif de coffrage 1 comprend une tôle de coffrage 2 qui est solidaire d'un jeu de poutres de maintien 3. Le dispositif de coffrage 1 comprend, par exemple, quatre poutres de maintien identiques parallèles référencées 30 à 33 présentant chacune un profil en forme de V à pointe tronquée.The formwork device 1 comprises a formwork sheet 2 which is integral with a set of holding beams 3. The formwork device 1 comprises, for example, four Identical parallel supporting beams referenced 30 to 33 each having a V-shaped profile with truncated tip.

Les poutres 30 à 33 sont régulièrement espacées sur la largeur de la tôle de coffrage 2. On note que les poutres de maintien 30 à 33 sont disposées suivant des génératrices parallèles sur toute la hauteur de la tôle de coffrage 2.The beams 30 to 33 are regularly spaced over the width of the formwork sheet 2. It is noted that the holding beams 30 to 33 are arranged along generatrices parallel over the entire height of the shuttering sheet 2.

Les poutres 30 à 33 présentent un profil en forme de V à pointe tronquée, dont les extrémités libres des deux branches 34, 35 se prolongent respectivement par un segment parallèle 36, 37 qui est soudé sur la tôle de coffrage 2.The beams 30 to 33 have a V-shaped profile with a truncated point, the free ends of the two branches 34, 35 are respectively extended by a parallel segment 36, 37 which is welded to the shuttering sheet 2.

Les poutres 30 à 33 sont reliées entre elles par des moyens de réglage en longueur s'étendant transversalement aux dites poutres et reliant celles-ci deux à deux dans la partie supérieure et inférieure du dispositif de coffrage 1.The beams 30 to 33 are interconnected by length adjustment means extending transversely to said beams and connecting these two by two in the upper and lower part of the formwork device 1.

Les moyens de réglage sont constitués de cornières 4 et 5 identiques qui sont fixées sur les pointes tronquées de chaque poutre 30 à 33. Les cornières 4 et 5 sont disposées perpendiculairement aux poutres 30 à 33 et dans la partie supérieure et inférieure du dispositif de coffrage 1.The adjustment means consist of identical angles 4 and 5 which are fixed on the truncated points of each beam 30 to 33. The angles 4 and 5 are arranged perpendicular to beams 30 to 33 and in the upper part and bottom of the formwork device 1.

On constate que les poutres 30 et 31 sont reliées par deux cornières parallèles 4, tandis que les poutres 32 et 33 sont reliées par deux cornières parallèles 5.It can be seen that the beams 30 and 31 are connected by two parallel angles 4, while the beams 32 and 33 are connected by two parallel angles 5.

Les cornières 4 et 5 du dispositif de coffrage 1 sont raccordées l'une à l'autre par des vérins à vis 6 qui sont soit écartés, soit resserrés suivant le rayon de courbure de cintrage que doit présenter le dispositif de coffrage 1.The angles 4 and 5 of the formwork device 1 are connected to each other by screw jacks 6 which are either separated or tightened according to the radius of curvature of bending that the formwork device 1 must have.

Les cornières 4 et 5 comprennent chacune au moins une lumière oblongue 40,50 dans laquelle coopèrent des moyens de fixation 38 avec la poutre correspondante pour permettre le cintrage du dispositif de coffrage 1 comme on le verra mieux plus loin.The angles 4 and 5 each comprise at least one oblong opening 40.50 in which cooperate fixing means 38 with the corresponding beam for allow the bending of the formwork device 1 as will be seen better below.

Également, les cornières 4 et 5 sont raccordées à l'opposé de chaque vérin à vis 6 à la tôle de coffrage 2 par des vérins à vis 7 qui permettent d'améliorer le réglage du rayon de courbure de la dite tôle de coffrage au niveau de ses extrémités libres.Also, the angles 4 and 5 are connected opposite to each screw jack 6 at the shuttering sheet 2 by screw jacks 7 which improve the adjustment of the radius of curvature of said formwork sheet at its free ends.

De la même manière, on constate qu'au milieu du dispositif de cintrage 1 et entre les cornières supérieures et inférieures, il est prévu d'autres vérins à vis 7 identiques à ceux décrits ci-dessus.Similarly, it can be seen that in the middle of the bending device 1 and between the upper and lower angles, other screw jacks 7 identical to those described above.

Le dispositif de coffrage 1 comporte des longerons de renfort 11 parallèles aux poutres 30 à 33. Les longerons 11 sont fixés sur toute la hauteur de la tôle de coffrage 2 et aux extrémités libres de cette dernière. The formwork device 1 comprises reinforcing beams 11 parallel to the beams 30 to 33. The longitudinal members 11 are fixed over the entire height of the shuttering sheet 2 and to free ends of the latter.

On a représenté en figures 3 et 4 des moyens de serrage 8 qui sont disposés à l'intérieur de chaque poutre 30 à 33, du dispositif de coffrage 1 pour la mise en place d'un gabarit de cintrage 10. Les moyens de serrage 8 sont prévus à chaque extrémité des poutres 30 à 33, c'est-à-dire dans la partie supérieure et inférieure du dispositif de coffrage 1.FIGS. 3 and 4 show clamping means 8 which are arranged at the inside of each beam 30 to 33, of the formwork device 1 for positioning a bending jig 10. The clamping means 8 are provided at each end beams 30 to 33, that is to say in the upper and lower part of the device formwork 1.

Chaque moyen de serrage 8 est constitué d'un talon métallique 80 faisant office de butée de serrage qui coulisse parallèlement et au-dessus des segments 36, 37 de chaque poutre 30 à 33. Le talon horizontal 80 est solidaire d'un manchon 81 en forme de U dans lequel est soudé un écrou 82 qui coopère avec une vis 83.Each clamping means 8 consists of a metal heel 80 acting as a clamping stop which slides parallel and above the segments 36, 37 of each beam 30 to 33. The horizontal heel 80 is integral with a sleeve 81 in the form of U in which is welded a nut 82 which cooperates with a screw 83.

Cette dernière présente une tête 84 à portée conique qui est logée dans une rondelle 86 de même profil. La rondelle 86 est soudée sur la partie tronquée du profil en forme de V de chaque poutre 30 à 33.The latter has a head 84 with a conical bearing which is housed in a washer 86 of the same profile. The washer 86 is welded to the truncated part of the V-shaped profile of each beam 30 to 33.

Le manchon 81 est solidaire d'un premier élément tubulaire 87 qui coopère coaxialement avec la partie interne d'un second élément 88 de même profil. Le second élément 88 est soudé sur une plaque 89 qui vient prendre appui sur la rondelle 86 à portée conique. La vis 83 comprend coaxialement à son corps une jupe 85 qui vient en butée contre la plaque 89 pour empêcher le retrait de la dite vis 83.The sleeve 81 is integral with a first tubular element 87 which cooperates coaxially with the internal part of a second element 88 of the same profile. The second element 88 is welded to a plate 89 which comes to bear on the washer 86 at conical bearing. The screw 83 comprises coaxially to its body a skirt 85 which comes in stop against the plate 89 to prevent the removal of said screw 83.

L'entraínement en rotation de la vis 83 par l'intermédiaire de sa tête 84 et au moyen d'une clef appropriée permet de déplacer en translation le talon horizontal 80 pour le serrage du gabarit de cintrage 10 qui vient en appui contre la tôle de coffrage 2 et dont on verra mieux plus loin la fonction.The rotational drive of the screw 83 by means of its head 84 and by means with an appropriate key allows the horizontal heel 80 to be moved in translation for the tightening of the bending jig 10 which bears against the formwork sheet 2 and of which we will see the function better later.

En figure 5, on a représenté un autre moyen de serrage 9 qui est disposé au même niveau que les moyens de serrage 8 mais à proximité des poutres 30 et 35 et dans la partie supérieure et inférieure du dispositif de coffrage 1.In Figure 5, there is shown another clamping means 9 which is arranged at the same level as the clamping means 8 but near the beams 30 and 35 and in the upper and lower part of the formwork device 1.

Chaque moyen de serrage 9 est constitué d'un manchon tubulaire à section carré ou circulaire 90 qui est fixé sur le longeron de renfort 11 solidaire de la tôle de coffrage 2.Each clamping means 9 consists of a tubular sleeve with square section or circular 90 which is fixed to the reinforcing beam 11 secured to the shuttering sheet 2.

A l'intérieur du manchon 90 est soudé un écrou 92 qui coopère avec une vis 93. La tête 94 de la vis 93 présente une portée conique qui vient prendre appuie dans une rondelle 95 ayant un profil interne complémentaire.Inside the sleeve 90 is welded a nut 92 which cooperates with a screw 93. The head 94 of the screw 93 has a conical bearing which comes to bear on a washer 95 with an additional internal profile.

La rondelle 95 et soudée sur une plaque d'appui 96 qui est solidaire d'un manchon 97 de même profil que celui 90 afin de pénétrer à l'intérieur de ce dernier. La vis 93 est solidaire d'une butée 98 qui empêche son retrait en venant prendre appuie contre la rondelle 95.The washer 95 and welded to a support plate 96 which is integral with a sleeve 97 of the same profile as that 90 in order to penetrate inside the latter. Screw 93 is integral with a stop 98 which prevents its withdrawal by coming to take support against the washer 95.

Le moyen de serrage 9 permet de retenir le gabarit de cintrage 10 contre la tôle de coffrage 2 par l'intermédiaire de la plaque 96 lorsque la vis 93 est actionnée en rotation.The clamping means 9 makes it possible to retain the bending jig 10 against the sheet of formwork 2 via the plate 96 when the screw 93 is actuated in rotation.

Il est prévu un moyen de serrage 9 à chaque angle du dispositif de coffrage 1. A clamping means 9 is provided at each corner of the formwork device 1.

Les moyens de réglage 4, 5, 6, 7 permettent d'effectuer un pré-cintrage du dispositif de coffrage 1 et plus particulièrement de la tôle de coffrage 2. Le pré-cintrage est effectué simultanément dans la partie supérieure et inférieure du dispositif de coffrage 1.The adjustment means 4, 5, 6, 7 make it possible to perform a pre-bending of the formwork 1 and more particularly formwork sheet 2. Pre-bending is carried out simultaneously in the upper and lower part of the formwork device 1.

On remarque que lors du pré-cintrage de la tôle de coffrage 2 les comières 4 et 5 s'inclinent de manière que les moyens de retenues 38 des poutres 31 et 32 coulissent à l'intérieur des lumières 40 et 50 prévues à cet effet.We note that during the pre-bending of the shuttering sheet 2 the edges 4 and 5 tilt so that the retaining means 38 of the beams 31 and 32 slide inside the lights 40 and 50 provided for this purpose.

Il est ensuite placé le gabarit de cintrage 10 réalisé soit en bois, soit en plastique tel que du polyéthylène, soit en nylon. Le gabarit de cintrage 10 est découpé à un rayon de courbure déterminé.It is then placed the bending jig 10 made either of wood or of plastic such that polyethylene is nylon. The bending template 10 is cut to a radius of determined curvature.

Le gabarit de cintrage 10 est disposé dans la partie supérieure et inférieure du dispositif de coffrage 1. Ainsi, chaque gabarit de cintrage 10 est retenue contre la tôle de coffrage 2 par l'intermédiaire des moyens de serrage 8 prévus dans chaque poutre 30 à 33.The bending jig 10 is arranged in the upper and lower part of the device formwork 1. Thus, each bending jig 10 is retained against the sheet metal formwork 2 by means of the clamping means 8 provided in each beam 30 to 33.

Également, chaque gabarit de cintrage 10 est maintenue aux extrémités du dispositif de coffrage 1 par l'intermédiaire des moyens de serrage 9 qui permettent de plaquer ledit gabarit contre la tôle de coffrage 2.Also, each bending jig 10 is held at the ends of the device formwork 1 by means of clamping means 9 which allow to press said template against the formwork sheet 2.

Dès que les gabarits de cintrage 10 sont parfaitement maintenus dans la partie supérieure et inférieure du dispositif de coffrage 1 les moyens de réglage 4, 5, 6 et 7 sont ajustés afin de déformer parfaitement la tôle de coffrage 2 soit au rayon de courbure des gabarits de cintrage 10, soit à des rayons de courbures différents mais compris dans la déformation élastique desdits gabarits.As soon as the bending jigs 10 are perfectly maintained in the part upper and lower of the formwork device 1 the adjustment means 4, 5, 6 and 7 are adjusted in order to perfectly deform the shuttering sheet 2 either within the radius of curvature of the bending jigs 10, ie at different radii of curvature but included in the elastic deformation of said templates.

Dès que le dispositif de coffrage 1 est ajusté au rayon de courbure adéquat et recherché celui-ci peut être associé à un autre dispositif de coffrage 1 identique au premier et réglé de la même façon (figure 6).As soon as the formwork device 1 is adjusted to the appropriate radius of curvature and sought this can be associated with another formwork device 1 identical to first and set in the same way (figure 6).

Ainsi plusieurs dispositifs de coffrage 1 peuvent être disposés les uns à côté des autres et les uns au-dessus des autres pour constituer, par exemple, un mur à profil courbe. Lorsque plusieurs dispositifs de coffrage 1 sont disposés les uns au-dessus des autres, il est prévu sur les gabarits de cintrage 10 une gorge centrale dans laquelle est disposée un joint d'étanchéité, permettant d'éviter l'écoulement de la laitance contenue dans le béton.Thus several formwork devices 1 can be arranged next to each other and one above the other to form, for example, a wall with a curved profile. When several formwork devices 1 are arranged one above the other, there is provided on the bending jigs 10 a central groove in which is arranged a seal, to prevent the flow of milt contained in concrete.

Claims (11)

  1. Formwork system with adjustable radius of curvature, for concrete constructions, comprising a sheet of formwork (2) secured to a set of beams spaced uniformly along generatrices, length-adjusting means (4, 5, 6 and 7) running transversely to the beams and connecting them, and at least one bending template (10) cut to a given radius of curvature, characterized in that the bending template (10) is pressed against the sheet of formwork (2) by first clamping means (8) which are arranged inside the holding beams (30 to 33) of the set of beams and by second clamping means (9) which are secured to a longitudinal member (11) fixed to the sheet of formwork (2), while the adjusting means (4, 5, 6 and 7) are designed to deform the sheet of formwork (2) either to the radius of curvature of the bending template (10) or to different radii of curvature, but. ones which lie within the elastic deformation of said templates.
  2. Formwork system according to Claim 1, characterized in that it comprises a bending template (10) in its upper and lower part.
  3. Formwork system according to Claim 1, characterized in that the bending template (10) has a central groove in which a seal is placed.
  4. Formwork system according to Claim 1, characterized in that the clamping means (8) comprise a heel (80) which is moved by means of a screw (83) collaborated with a nut (82) fixed into a U-shaped sleeve (81) secured to a first tubular element (87) which slides in a second (88) with the same profile.
  5. Formwork system according to Claim 4, characterized in that the screw (83) is secured to a skirt (85) which prevents it from being withdrawn.
  6. Formwork system according to Claim 4, characterized in that the second element (88) is secured to a plate (89) which bears against a washer (86).
  7. Formwork system according to Claim 1, characterized in that the clamping means (9) comprise a sleeve (90) secured to a longitudinal member (11) fixed to the sheet of formwork (2), a nut (92) which is welded to the inside of the sleeve (90), a screw (93) which collaborates with the nut (92) and of which the head (94), which has a conical bearing surface, is introduced into a washer with the same profile (95) secured to a clamping plate (96).
  8. Formwork system according to Claim 7, characterized in that the plate (96) is connected to a sleeve (97) which slides inside the sleeve (90).
  9. Formwork system according to Claim 1, characterized in that the beams (30 to 33) have a V-shape, the inclined parts (34, 35) of which V are extended by parallel segments (36, 37) which are welded to the sheet of formwork (2).
  10. Formwork system according to Claim 1, characterized in that the bending templates (10) are made either of wood or of plastic or of nylon.
  11. Method for implementing the formwork system according to Claim 1, characterized in that it consists:
    in pre-bending a sheet of formwork (2) secured, along its generatrices, to holding beams (30 to 33) using adjusting means (4, 5, 6 and 7),
    in pressing a bending template (10) that has a given radius of curvature into the upper and lower part of the formwork system (1),
    in acting on clamping means (8, 9) provided one in each holding beam (30 to 33) and on a longitudinal member (11) to press the bending templates (10) against the sheet of formwork (2),
    and in actuating the adjusting means (4, 5, 6 and 7) to definitively bend the sheet of formwork (2) either to the radius of curvature of the bending templates (10) or to different radii of curvature but ones which lie within the elastic deformation of the said templates.
EP97420055A 1996-04-05 1997-04-03 Formwork system with adjustable curvature Expired - Lifetime EP0799950B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9604536 1996-04-05
FR9604536A FR2747145B1 (en) 1996-04-05 1996-04-05 FORMWORK DEVICE WITH ADJUSTABLE CURVE RADIUS

Publications (2)

Publication Number Publication Date
EP0799950A1 EP0799950A1 (en) 1997-10-08
EP0799950B1 true EP0799950B1 (en) 2002-07-31

Family

ID=9491108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97420055A Expired - Lifetime EP0799950B1 (en) 1996-04-05 1997-04-03 Formwork system with adjustable curvature

Country Status (6)

Country Link
EP (1) EP0799950B1 (en)
AT (1) ATE221607T1 (en)
DE (1) DE69714329T2 (en)
ES (1) ES2183110T3 (en)
FR (1) FR2747145B1 (en)
PT (1) PT799950E (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE388289T1 (en) * 2000-09-18 2008-03-15 Ulma C Y E S Coop MODULAR CURVED FORMWORK WITH VARIABLE RADIUS
CN103866973A (en) * 2014-03-30 2014-06-18 青岛一建集团有限公司 Supporting device of three-dimensional arc cantilever concrete component formwork
CN105937302B (en) * 2016-06-14 2017-11-14 中建一局集团第三建筑有限公司 Application of arc-shaped wall template system in concrete pouring
CN110397265B (en) * 2019-07-29 2021-09-21 国网河北省电力有限公司邢台供电分公司 Composite plastic plate, preparation method, template and shaping method
CN114809607B (en) * 2022-03-23 2024-05-28 上海大界智能设备有限公司 Die system for concrete pouring
CN115506578B (en) * 2022-09-30 2024-04-26 上海强荣建设集团有限公司 Template of arc building and template system formed by same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616148A (en) * 1949-01-11 1952-11-04 Kwikform Ltd Shuttering for use in molding arched concrete roof structures
DE8815339U1 (en) * 1988-12-09 1989-03-23 Werner Zapf KG, 8580 Bayreuth Formwork for large-format curved precast reinforced concrete elements
DE8908734U1 (en) * 1989-07-18 1989-08-31 Josef Oevermann GmbH & Co., 4400 Münster Tower formwork
FR2704260B1 (en) * 1993-04-21 1995-07-21 Ricard Coffrages PROCESS FOR BENDING SHAPED WALLS, AND BENDABLE SHAPED WALLS USING THE SAME.
FR2711705B1 (en) * 1993-10-27 1996-01-12 Sateco Sa Formwork device with adjustable radius of curvature, especially for concrete structures.

Also Published As

Publication number Publication date
ATE221607T1 (en) 2002-08-15
EP0799950A1 (en) 1997-10-08
DE69714329D1 (en) 2002-09-05
FR2747145A1 (en) 1997-10-10
ES2183110T3 (en) 2003-03-16
FR2747145B1 (en) 1998-05-22
PT799950E (en) 2002-12-31
DE69714329T2 (en) 2003-03-27

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