EP0751268A2 - Modular supporting system for concrete floor shutterings - Google Patents

Modular supporting system for concrete floor shutterings Download PDF

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Publication number
EP0751268A2
EP0751268A2 EP96116162A EP96116162A EP0751268A2 EP 0751268 A2 EP0751268 A2 EP 0751268A2 EP 96116162 A EP96116162 A EP 96116162A EP 96116162 A EP96116162 A EP 96116162A EP 0751268 A2 EP0751268 A2 EP 0751268A2
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EP
European Patent Office
Prior art keywords
beams
support
plate
hooking
formwork
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Withdrawn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
EP96116162A
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German (de)
French (fr)
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EP0751268A3 (en
Inventor
Hubert Ricard
Jean-Paul Bailly
Guy Demichelis
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.)
SCOP NOUVELLE RICARD Ste
Original Assignee
SCOP NOUVELLE RICARD Ste
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Application filed by SCOP NOUVELLE RICARD Ste filed Critical SCOP NOUVELLE RICARD Ste
Publication of EP0751268A2 publication Critical patent/EP0751268A2/en
Publication of EP0751268A3 publication Critical patent/EP0751268A3/en
Withdrawn legal-status Critical Current

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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
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/486—Dropheads supporting the concrete after removal of the shuttering; Connecting means on beams specially adapted for dropheads
    • 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
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50—Girders, beams, or the like as supporting members for forms
    • E04G2011/505—Girders, beams, or the like as supporting members for forms with nailable or screwable inserts

Definitions

  • Modular formwork systems of this kind generally have the advantages of being able to be set up quickly, with great ease, and of being able to be laid down, just as easily and quickly.
  • Such a device has very significant drawbacks and in particular a reduced solidity due to the fact that the primary beams are only hung on a plate of the falling heads of the props, which can also deform or crack before breaking.
  • a first object of the invention is to remedy the aforementioned drawbacks.
  • this objective is achieved by means of a modular bearing system of the aforementioned kind remarkable by the fact that the drooping head of the props is provided with a support console arranged above and at a distance from the attachment plate of said drooping head, and by the fact that the attachment ends of the primary beams comprise, above and at a distance from their attachment lug (s), a boss having a lower bearing surface intended to rest on said support console for the hanging head of the props.
  • the primary beams can be placed in double support on the drooping heads of the props.
  • the fixed column of the propping heads has a stop plate disposed below the fixed upper plate of said props and above the support console, this stop plate s' opposing the untimely lifting of the primary beams hung on the drooping head when the latter found in high position.
  • the primary beams 3 and the secondary beams 4 are shaped or arranged in such a way that when the first ones are hung on the heads 2 of the props 1 and the second hung, by means of their hooking ends 5, on the side of the primary beams 3, the upper horizontal surfaces S of said secondary beams 4 are arranged in a plane PP located at a distance and above the plane P'-P 'in which are placed the upper surfaces S' of said primary beams 3.
  • the formwork skin or formwork surface 33 which may consist of a sheet of plywood having the desired thickness, is placed on the upper face S of the secondary beams 4, so that a space d is formed below said formwork skin 33, between the planes PP and P'-P 'in which the upper faces S and S' of the secondary 4 and primary 3 beams are respectively arranged.
  • the beams 3 and 4 may advantageously be constituted by metal profiles such as aluminum profiles comprising, in a manner known per se, an upper groove in which is housed a fur 6 constituted by a wooden cleat and a lower groove 7 allowing in particular the attachment of various devices or devices necessary for construction.
  • metal profiles such as aluminum profiles comprising, in a manner known per se, an upper groove in which is housed a fur 6 constituted by a wooden cleat and a lower groove 7 allowing in particular the attachment of various devices or devices necessary for construction.
  • These beams 3 comprise, in their lower part and on each of their sides, a fin 8 inclined towards the outside and in the direction of the top, this fin extending over the entire length of said beams and delimiting a gutter or longitudinal groove 9.
  • the secondary beams 4 may be different from the primary beams 3.
  • the fixed column 16 has at its upper part, two superimposed horizontal plates 19, 20 distant from each other.
  • the upper plate 19 is intended to support the formwork skin 33, while that the lower plate 20 constitutes a stop opposing the accidental lifting of the primary beams 3 hung on the drop head, when the movable element of the latter is in the high position.
  • the column 16 has, in its lower part, two longitudinal columns 21 diametrically opposite and on the top of which rests the cam 18 when the movable support 17 is immobilized in the high position.
  • the mobile support 17 comprises, on the one hand, near its lower end, a hooking plate 22 for hooking the ends 5 of primary beams 3 and, on the other hand share, at its upper part, a support console 23 disposed above and at a distance from said attachment plate, this console constituting, for example, the top of said mobile support.
  • the attachment plate 22 has a rim 24 inclined towards the outside and delimiting a peripheral groove 22a in the form of a quadrilateral, the degree of inclination of this rim being substantially the same as that of the lateral fins 8 of the beams 3.
  • D ' the other hand, the distance D4 which separates the rim 24 and the bearing surface of the support console 23, is substantially equal to the distance D3 comprised between the latching pins 10 and the base 11a of the support bosses 11 of the primary beams 3.
  • the descending cam 18 of the falling heads comprises a body 25 provided with a circular central opening 26 communicating with two lateral notches 27 diametrically opposite and dimensioned to allow the passage of the supporting and guiding columns 21.
  • the descending cam present on its underside, two planar surfaces 28 diametrically opposite, allowing its support on the top of the columns 21 and helical sloping surfaces 29 connecting said planar surfaces 28 to the notches 27.
  • the cam cam includes two diametrically opposed levers 30, allowing its operation.
  • the mobile support 17 is held in the high position by the cam 18 which rests on the top of the columns 21, by means of its bearing surfaces 28.
  • the mobile support is lowered by turning the cam 18 over 90 degrees, so as to bring its notches 27 above the posts 21 which serve as guides to said cam, when the latter falls and when it rises to the locked position.
  • FIG. 14 There is shown in Figure 14, the establishment of a primary beam 3. It is first hung, by means of the latching lugs 10 of one of its ends 5, on the attachment plate 22 of the drooping head 2 of a forestay 1, then lifted in a horizontal position and hung, by means of its opposite butt, on the drooping head of a second forestay arranged in alignment with the first. In this position (FIG. 13), the latching lugs 10 of the primary beam 3 are housed in the groove 22a of the latching plate 22, while its support boss 11 rests on the upper face of the console support 23. This double bond ensures stable and solid positioning of the primary beams on the falling heads of the props.
  • the upper fixed plate 19 intended to support the formwork skin 33 provides protection for the underlying fixed plate 20 in the event of the forestay falling, this result having its importance since a deformation of the plate fixed stop, even reduced, may render said stay unusable.
  • each end of the primary beams 3 has, in its lower part, a chamfer 31 disposed behind and close to the hooking nozzles 10, and the inclination of which is reversed relative to the inclination of the fins 8 and ledges 24.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The carrier comprises props (1) of the falling head type (2). Primary beams (3) anchor on the prop heads by end pieces (5) having anchoring lugs (10). The prop falling heads comprise a fixed column (16) having at its top a plate (19) which supports the coffering skin (33). A support (17), which can be moved about the fixed column, has a plate (22) for anchoring the primary beam end pieces. The falling head also has a support console (23) located above and at a distance from the anchoring plate. The primary beams' end pieces have, above and at a distance from their anchoring lugs, a boss (11) having a console support surface.

Description

La présente invention concerne un système portant modulaire pour coffrage de dalles en béton, du genre comprenant principalement :

  • des étais ou poteaux d'étaiement, du type à tête tombante ;
  • des poutres primaires ou poutres porteuses destinées à s'accrocher sur les têtes des étais ou poteaux par l'intermédiaire de leurs abouts munis d'ergots d'accrochage ;
  • des poutres secondaires appelées à s'accrocher sur les côtés des poutres primaires par l'intermédiaire de leurs abouts pourvus d'ergots d'accrochage ;
  • une peau coffrante constituée par des plaques ou panneaux de contreplaqué posés sur ledit système portant.
The present invention relates to a modular bearing system for formwork of concrete slabs, of the type mainly comprising:
  • props or shoring posts, of the drop head type;
  • primary beams or load-bearing beams intended to hang on the heads of the props or posts by means of their ends provided with hooking lugs;
  • secondary beams called to hang on the sides of the primary beams by means of their ends provided with hooking lugs;
  • a formwork skin formed by plywood plates or panels placed on said bearing system.

Les systèmes de coffrage modulaire de ce genre ont généralement pour avantages de pouvoir être mis en place rapidement, avec une grande facilité, et de pouvoir être déposés, de façon toute aussi aisée et rapide. De plus, il est possible de démonter prématurément les poutres secondaires et primaires, après coulage de la dalle de béton et avant le séchage complet de celle-ci qui demeure simplement soutenue par les étais et les panneaux de coffrage restant en place.Modular formwork systems of this kind generally have the advantages of being able to be set up quickly, with great ease, and of being able to be laid down, just as easily and quickly. In addition, it is possible to dismantle the secondary and primary beams prematurely, after pouring the concrete slab and before the complete drying of the latter, which remains simply supported by the props and the shuttering panels remaining in place.

La mise en place de ces systèmes de coffrage modulaire s'effectue suivant une trame composée de mailles ou modules quadrangulaires (carrées ou rectangulaires) dont les dimensions correspondent à la longueur des poutres primaires et secondaires et dont les angles sont occupés par les sommets des étais ou poteaux d'étaiement.The installation of these modular formwork systems is carried out according to a frame composed of meshes or quadrangular modules (square or rectangular) whose dimensions correspond to the length of the primary and secondary beams and whose angles are occupied by the tops of the props or shoring posts.

On connait (GB-A-2.005.332) un coffrage pour planchers en béton comportant : - des étais à tête tombante munie d'une platine d'accrochage ; - des poutres primaires destinées à s'accrocher sur les platines d'accrochage des têtes tombantes des étais, par l'intermédiaire de leurs abouts munis d'ergots d'accrochage ; - des poutres secondaires également destinées à reposer sur des ailettes latérales des poutres primaires.We know (GB-A-2.005.332) a formwork for concrete floors comprising: - props with head drop fitted with a mounting plate; - primary beams intended to hang on the hooking plates of the drooping heads of the props, by means of their ends provided with hooking lugs; - secondary beams also intended to rest on lateral fins of the primary beams.

Un tel dispositif présente de très importants inconvénients et notamment une solidité réduite en raison du fait que les poutres primaires sont uniquement accrochées sur une plaque des têtes tombantes des étais, laquelle peut également se déformer ou se fissurer avant de casser.Such a device has very significant drawbacks and in particular a reduced solidity due to the fact that the primary beams are only hung on a plate of the falling heads of the props, which can also deform or crack before breaking.

Un premier objet de l'invention, est de remédier aux inconvénients susmentionnés.A first object of the invention is to remedy the aforementioned drawbacks.

Selon l'invention, cet objectif est atteint grâce à un système portant modulaire du genre susmentionné remarquable par le fait que la tête tombante des étais est pourvue d'une console de soutien disposée au-dessus et à distance de la platine d'accrochage de ladite tête tombante, et par le fait que les abouts d'accrochage des poutres primaires comportent, au-dessus et à distance de leur(s) ergot(s) d'accrochage, un bossage présentant une surface inférieure d'appui destinée à reposer sur ladite console de soutien de la tête tombante des étais.According to the invention, this objective is achieved by means of a modular bearing system of the aforementioned kind remarkable by the fact that the drooping head of the props is provided with a support console arranged above and at a distance from the attachment plate of said drooping head, and by the fact that the attachment ends of the primary beams comprise, above and at a distance from their attachment lug (s), a boss having a lower bearing surface intended to rest on said support console for the hanging head of the props.

Grâce à cette disposition, les poutres primaires peuvent être placées en double appui sur les têtes tombantes des étais.Thanks to this arrangement, the primary beams can be placed in double support on the drooping heads of the props.

Selon une autre disposition caractéristique de l'invention, la colonne fixe des étais à tête tombante comporte une plaque de butée disposée au-dessous de la plaque supérieure fixe desdits étais et au-dessus de la console de soutien, cette plaque de butée s'opposant au soulèvement intempestif des poutres primaires accrochées sur la tête tombante lorsque celle-ci se trouve en position haute.According to another characteristic arrangement of the invention, the fixed column of the propping heads has a stop plate disposed below the fixed upper plate of said props and above the support console, this stop plate s' opposing the untimely lifting of the primary beams hung on the drooping head when the latter found in high position.

On obtient ainsi des structures portantes plus stables et plus solides et une meilleure sécurité dans la liaison des composants de ces structures.This produces more stable and stronger load-bearing structures and better security in the connection of the components of these structures.

Les buts, caractéristiques et avantages ci-dessus, et d'autres encore, ressortiront mieux de la description qui suit et des dessins annexés dans lesquels :

  • La figure 1 est une vue de face, à caractère sommaire, illustrant le système portant modulaire pour coffrage de dalles en béton, selon l'invention.
  • La figure 2 est une vue en coupe suivant la ligne 2-2 de la figure 1.
  • La figure 3 est une vue de face, avec coupes partielles, d'une poutre exécutée selon l'invention, principalement en vue d'une utilisation comme poutre primaire, mais qui peut aussi être employée comme poutre secondaire et/ou comme entretoise de stabilisation.
  • La figure 4 est une vue de dessus de cette poutre.
  • La figure 5 est une vue à plus grande échelle et en coupe transversale selon la ligne 12-12 de la figure 3.
  • La figure 6 est une vue en coupe axiale d'une extrémité de poutre primaire équipée de son about d'accrochage.
  • La figure 7 est une vue en élévation avec coupe axiale partielle, de la portion supérieure d'un étai équipé d'une tête tombante.
  • Les figures 8 et 9 sont des vues en plan et en coupe, respectivement, suivant les lignes 24-24 et 25-25 de la figure 7.
  • La figure 10 est une vue en plan et à plus grande échelle, de la came de décintrage permettant la descente de tête tombante.
  • La figure 11 est une vue en coupe suivant la ligne 27-27 de la figure 10.
  • La figure 12 est une vue en élévation avec coupe partielle montrant l'accrochage de deux poutres primaires sur une tête tombante représentée en position haute de fonctionnement.
  • La figure 13 est une vue analogue à la figure 12 et représentant le décintrage obtenu par la descente de la tête tombante montrée en position basse.
  • La figure 14 illustre la dynamique de mise en place d'une poutre primaire.
  • La figure 15 est une vue de détail de la figure 14.
The aims, characteristics and advantages above, and others still, will emerge more clearly from the description which follows and from the appended drawings in which:
  • Figure 1 is a front view, in summary, illustrating the modular bearing system for formwork of concrete slabs, according to the invention.
  • Figure 2 is a sectional view along line 2-2 of Figure 1.
  • Figure 3 is a front view, with partial sections, of a beam executed according to the invention, mainly for use as a primary beam, but which can also be used as a secondary beam and / or as a stabilization spacer .
  • Figure 4 is a top view of this beam.
  • FIG. 5 is a view on a larger scale and in cross section along line 12-12 of FIG. 3.
  • Figure 6 is an axial sectional view of an end of the primary beam equipped with its hooking end.
  • Figure 7 is an elevational view in partial axial section, of the upper portion of a forestay equipped with a drooping head.
  • Figures 8 and 9 are plan and sectional views, respectively, along lines 24-24 and 25-25 of Figure 7.
  • FIG. 10 is a plan view and on a larger scale, of the descending cam allowing the descent of the drooping head.
  • Figure 11 is a sectional view along the line 27-27 of figure 10.
  • Figure 12 is an elevational view in partial section showing the attachment of two primary beams on a drop head shown in the high operating position.
  • Figure 13 is a view similar to Figure 12 and showing the decoupage obtained by the descent of the drooping head shown in the lower position.
  • Figure 14 illustrates the dynamics of setting up a primary beam.
  • FIG. 15 is a detailed view of FIG. 14.

On se reporte auxdits dessins pour décrire un exemple avantageux, quoique nullement limitatif, d'exécution du système portant modulaire ou structure porteuse modulaire pour coffrage de planchers ou dalles en béton, selon l'invention.Reference is made to said drawings to describe an advantageous, although in no way limiting, example of the execution of the modular bearing system or modular bearing structure for formwork of concrete floors or slabs, according to the invention.

Ce système comprend, de manière connue en soi :

  • des étais ou poteaux d'étaiement 1, dont le sommet est équipé d'une tête tombante 2 ;
  • des poutres primaires ou poutres porteuses 3 destinées à s'accrocher sur les têtes de ces étais ou poteaux d'étaiement ; - des poutres secondaires 4 appelées à s'accrocher sur lesdites poutres primaires.
This system comprises, in a manner known per se:
  • props or shoring posts 1, the top of which is fitted with a drooping head 2;
  • primary beams or supporting beams 3 intended to hang on the heads of these props or shoring posts; - Secondary beams 4 called to hang on said primary beams.

Les poutres primaires 3 et les poutres secondaires 4 sont conformées ou agencées de manière que lorsque les premières se trouvent accrochées sur les têtes 2 des étais 1 et les secondes accrochées, par l'intermédiaire de leurs abouts d'accrochage 5, sur le côté des poutres primaires 3, les surfaces horizontales supérieures S desdites poutres secondaires 4 se trouvent disposées dans un plan P-P situé à distance et au-dessus du plan P'-P' dans lequel se trouvent placées les surfaces supérieures S' desdites poutres primaires 3. Selon un procédé décrit dans la Demande de Brevet EP-A-0.511.921, la peau coffrante ou surface coffrante 33 qui peut être constituée par une feuille de contreplaqué présentant l'épaisseur souhaitable, est posée sur la face supérieure S des poutres secondaires 4, de sorte qu'un espace d se trouve ménagé au-dessous de ladite peau coffrante 33, entre les plans P-P et P'-P' dans lesquels sont respectivement disposées les faces supérieures S et S' des poutres secondaires 4 et primaires 3.The primary beams 3 and the secondary beams 4 are shaped or arranged in such a way that when the first ones are hung on the heads 2 of the props 1 and the second hung, by means of their hooking ends 5, on the side of the primary beams 3, the upper horizontal surfaces S of said secondary beams 4 are arranged in a plane PP located at a distance and above the plane P'-P 'in which are placed the upper surfaces S' of said primary beams 3. According to a process described in Patent Application EP-A-0.511.921, the formwork skin or formwork surface 33 which may consist of a sheet of plywood having the desired thickness, is placed on the upper face S of the secondary beams 4, so that a space d is formed below said formwork skin 33, between the planes PP and P'-P 'in which the upper faces S and S' of the secondary 4 and primary 3 beams are respectively arranged.

Les poutres 3 et 4 peuvent être avantageusement constituées par des profilés métalliques tels que profilés d'aluminium comportant, de manière connue en soi, une gorge supérieure dans laquelle est logée une fourrure 6 constituée par un tasseau de bois et une gorge inférieure 7 permettant notamment l'accrochage de différents appareils ou dispositifs nécessaires à la construction.The beams 3 and 4 may advantageously be constituted by metal profiles such as aluminum profiles comprising, in a manner known per se, an upper groove in which is housed a fur 6 constituted by a wooden cleat and a lower groove 7 allowing in particular the attachment of various devices or devices necessary for construction.

Ces poutres 3 comportent, dans leur partie inférieure et sur chacun de leurs côtés, une ailette 8 inclinée vers l'extérieur et en direction du haut, cette ailette s'étendant sur toute la longueur desdites poutres et délimitant une gouttière ou gorge longitudinale 9.These beams 3 comprise, in their lower part and on each of their sides, a fin 8 inclined towards the outside and in the direction of the top, this fin extending over the entire length of said beams and delimiting a gutter or longitudinal groove 9.

A chacune de leurs extrémités, les poutres 3 sont équipées d'un about d'accrochage 5 constitué par un flasque métallique rigidement fixé, par exemple par vissage, sur ladite extrémité. Ce flasque comporte, extérieurement :

  • dans sa partie inférieure, au moins un ergot d'accrochage 10 ;
  • dans sa partie supérieure, un bossage d'appui 11 à sommet arrondi comportant une large surface inférieure d'appui 11a et dans lequel est, de préférence, ménagé un passage transversal 12.
At each of their ends, the beams 3 are equipped with an attachment end 5 constituted by a metal flange rigidly fixed, for example by screwing, on said end. This flange includes, externally:
  • in its lower part, at least one latching pin 10;
  • in its upper part, a support boss 11 with a rounded top having a large lower support surface 11a and in which is preferably formed a transverse passage 12.

Lorsqu'une poutre 3 utilisée comme poutre secondaire 4 est accrochée sur une poutre primaire 3, son ergot d'accrochage 10 est logé dans la gorge 9 de la poutre primaire, tandis que son bossage 11 repose sur la face supérieure S' de ladite poutre primaire (figure 1). L'ergot 10 assure l'accrochage tandis que le bossage 11 permet l'application des forces supportées par la poutre secondaire sur la partie la plus robuste de la poutre primaire. On obtient ainsi un assemblage rapide, stable, solide et sûr des poutres primaires et des poutres secondaires.When a beam 3 used as a secondary beam 4 is hung on a primary beam 3, its hooking lug 10 is housed in the groove 9 of the primary beam, while its boss 11 rests on the upper face S 'of said primary beam (Figure 1). The lug 10 ensures the attachment while the boss 11 allows the application of the forces supported by the secondary beam on the most robust part of the primary beam. This provides a quick, stable, solid and safe assembly of the primary beams and secondary beams.

La possibilité d'utiliser des poutres rigoureusement identiques pour remplir la fonction de poutres primaires porteuses 3 accrochées sur les têtes 2 des étais 1, et également la fonction de poutres secondaires 4 accrochées sur les côtés des poutres primaires et servant de supports à la peau coffrante, permet d'utiliser un seul type de poutre pour réaliser le système portant modulaire selon l'invention.The possibility of using strictly identical beams to fulfill the function of primary load-bearing beams 3 hung on the heads 2 of the props 1, and also the function of secondary beams 4 hung on the sides of the primary beams and serving as supports for the formwork skin , allows the use of a single type of beam to produce the modular bearing system according to the invention.

Toutefois, notamment pour répondre à des impératifs économiques, les poutres secondaires 4 peuvent être différentes des poutres primaires 3.However, in particular to meet economic imperatives, the secondary beams 4 may be different from the primary beams 3.

La tête tombante 2 équipant le sommet des étais 1 comprend :

  • une colonne fixe 16 par exemple rigidement fixée à la partie supérieure d'un étai classique 1 ;
  • un support 17 comportant un corps tubulaire et monté autour de cette colonne fixe 16 avec une aptitude de mouvement axial le long de celle-ci.
  • une came de décintrage 18, montée avec une aptitude de rotation autour de la colonne fixe 16 et au-dessous du support mobile 17, cette came de décintrage pouvant coulisser axialement, le long de la partie inférieure de ladite colonne.
The drooping head 2 fitted to the top of the props 1 comprises:
  • a fixed column 16, for example rigidly fixed to the upper part of a conventional forestay 1;
  • a support 17 comprising a tubular body and mounted around this fixed column 16 with an aptitude for axial movement along the latter.
  • a descending cam 18, mounted with an aptitude for rotation around the fixed column 16 and below the movable support 17, this descending cam being able to slide axially, along the lower part of said column.

Selon une disposition caractéristique de l'invention, la colonne fixe 16 comporte à sa partie supérieure, deux plaques horizontales superposées 19, 20 distantes l'une de l'autre. La plaque supérieure 19 est destinée à l'appui de la peau coffrante 33, tandis que la plaque inférieure 20 constitue une butée s'opposant au soulèvement accidentel des poutres primaires 3 accrochées sur la tête tombante, lorsque l'élément mobile de cette dernière se trouve en position haute.According to a characteristic arrangement of the invention, the fixed column 16 has at its upper part, two superimposed horizontal plates 19, 20 distant from each other. The upper plate 19 is intended to support the formwork skin 33, while that the lower plate 20 constitutes a stop opposing the accidental lifting of the primary beams 3 hung on the drop head, when the movable element of the latter is in the high position.

La colonne 16 présente, dans sa partie inférieure, deux colonnettes longitudinales 21 diamétralement opposées et sur le sommet desquelles repose la came de décintrement 18 lorsque le support mobile 17 se trouve immobilisé en position haute.The column 16 has, in its lower part, two longitudinal columns 21 diametrically opposite and on the top of which rests the cam 18 when the movable support 17 is immobilized in the high position.

Selon une autre disposition caractéristique de l'invention, le support mobile 17 comprend, d'une part, à proximité de son extrémité inférieure, une platine d'accrochage 22 pour l'accrochage des abouts 5 de poutres primaires 3 et, d'autre part, à sa partie supérieure, une console de soutien 23 disposée au-dessus et à distance de ladite platine d'accrochage, cette console constituant, par exemple, le sommet dudit support mobile. La platine d'accrochage 22 comporte un rebord 24 incliné vers l'extérieur et délimitant une gorge périphérique 22a en forme de quadrilatère, le degré d'inclinaison de ce rebord étant sensiblement le même que celui des ailettes latérales 8 des poutres 3. D'autre part, la distance D4 qui sépare le rebord 24 et la surface d'appui de la console de soutien 23, est sensiblement égale à la distance D3 comprise entre les ergots d'accrochage 10 et la base 11a des bossages d'appui 11 des poutres primaires 3.According to another characteristic arrangement of the invention, the mobile support 17 comprises, on the one hand, near its lower end, a hooking plate 22 for hooking the ends 5 of primary beams 3 and, on the other hand share, at its upper part, a support console 23 disposed above and at a distance from said attachment plate, this console constituting, for example, the top of said mobile support. The attachment plate 22 has a rim 24 inclined towards the outside and delimiting a peripheral groove 22a in the form of a quadrilateral, the degree of inclination of this rim being substantially the same as that of the lateral fins 8 of the beams 3. D ' on the other hand, the distance D4 which separates the rim 24 and the bearing surface of the support console 23, is substantially equal to the distance D3 comprised between the latching pins 10 and the base 11a of the support bosses 11 of the primary beams 3.

La came de décintrage 18 des têtes tombantes comprend un corps 25 pourvu d'une ouverture centrale circulaire 26 communiquant avec deux échancrures latérales 27 diamétralement opposées et dimensionnées pour permettre le passage des colonnettes d'appui et de guidage 21. La came de décintrage présente sur sa face inférieure, deux surfaces planes 28 diamétralement opposées, permettant son appui sur le sommet des colonnettes 21 et des surfaces pentées hélicoïdales 29 reliant lesdites surfaces planes 28 aux échancrures 27. Latéralement, la came de décintrage comporte deux manettes 30 diamétralement opposées, permettant sa manoeuvre.The descending cam 18 of the falling heads comprises a body 25 provided with a circular central opening 26 communicating with two lateral notches 27 diametrically opposite and dimensioned to allow the passage of the supporting and guiding columns 21. The descending cam present on its underside, two planar surfaces 28 diametrically opposite, allowing its support on the top of the columns 21 and helical sloping surfaces 29 connecting said planar surfaces 28 to the notches 27. Laterally, the cam cam includes two diametrically opposed levers 30, allowing its operation.

On conçoit bien le fonctionnement de ces têtes tombantes qui se trouvent en position haute lors de la mise en place des composants horizontaux de la structure portante (figure 12) ainsi que pendant l'opération de coulage de la dalle et durant un premier temps de séchage de celle-ci, et qui sont descendues en position basse (figure 13), par exemple lorsqu'on veut procéder au démontage prématuré desdits composants horizontaux avant le complet séchage de la dalle D coulée, afin de pouvoir les réutiliser immédiatement.It is easy to understand the operation of these drooping heads which are in the high position during the positioning of the horizontal components of the supporting structure (FIG. 12) as well as during the operation of pouring the slab and during a first drying time. thereof, and which are lowered to the low position (Figure 13), for example when one wishes to proceed with the premature dismantling of said horizontal components before the complete drying of the slab D poured, so that they can be reused immediately.

Le support mobile 17 se trouve maintenu en position haute par la came de décintrement 18 qui repose sur le sommet des colonnettes 21, par l'intermédiaire de ses surfaces d'appui 28. On obtient la descente dudit support mobile en tournant la came de décintrement 18 sur 90 degrés, de manière à amener ses échancrures 27 au-dessus des colonnettes 21 qui servent de guides à ladite came, lors de la chute de cette dernière et lors de sa remontée en position de blocage.The mobile support 17 is held in the high position by the cam 18 which rests on the top of the columns 21, by means of its bearing surfaces 28. The mobile support is lowered by turning the cam 18 over 90 degrees, so as to bring its notches 27 above the posts 21 which serve as guides to said cam, when the latter falls and when it rises to the locked position.

On a représenté, à la figure 14, la mise en place d'une poutre primaire 3. Celle-ci est d'abord accrochée, par l'intermédiaire des ergots d'accrochage 10 de l'un de ses abouts 5, sur la platine d'accrochage 22 de la tête tombante 2 d'un étai 1, puis soulevée en position horizontale et accrochée, par l'intermédiaire de son about opposé, sur la tête tombante d'un deuxième étai disposé dans l'alignement du premier. Dans cette position (figure 13), les ergots d'accrochage 10 de la poutre primaire 3 se trouvent logés dans la gorge 22a de la platine d'accrochage 22, tandis que son bossage d'appui 11 repose sur la face supérieure de la console de soutien 23. Cette double liaison assure un positionnement stable et solide des poutres primaires sur les têtes tombantes des étais.There is shown in Figure 14, the establishment of a primary beam 3. It is first hung, by means of the latching lugs 10 of one of its ends 5, on the attachment plate 22 of the drooping head 2 of a forestay 1, then lifted in a horizontal position and hung, by means of its opposite butt, on the drooping head of a second forestay arranged in alignment with the first. In this position (FIG. 13), the latching lugs 10 of the primary beam 3 are housed in the groove 22a of the latching plate 22, while its support boss 11 rests on the upper face of the console support 23. This double bond ensures stable and solid positioning of the primary beams on the falling heads of the props.

On observe que lorsque la poutre 3 a été positionnée, elle ne peut se décrocher accidentellement en raison d'une force appliquée vers le haut, par suite du fait que la plaque fixe de butée 20 de la tête tombante au-dessous de laquelle se trouve engagé le bossage 11 de l'about 5 de ladite poutre, empêche tout soulèvement de cette dernière.It is observed that when the beam 3 has been positioned, it cannot accidentally unhook due to an applied force upwards, owing to the fact that the fixed abutment plate 20 of the drooping head below which is located engaged the boss 11 of the end 5 of said beam, prevents any lifting of the latter.

On observe que la plaque fixe supérieure 19 destinée à l'appui de la peau coffrante 33, assure la protection de la plaque fixe sous-jacente 20 en cas de chute de l'étai, ce résultat ayant son importance car une déformation de la plaque fixe de butée, même réduite, risque de rendre ledit étai inutilisable.It is observed that the upper fixed plate 19 intended to support the formwork skin 33, provides protection for the underlying fixed plate 20 in the event of the forestay falling, this result having its importance since a deformation of the plate fixed stop, even reduced, may render said stay unusable.

D'autre part, chaque extrémité des poutres primaires 3 présente, dans sa partie inférieure, un chanfrein 31 disposé en arrière et à proximité des becs d'accrochage 10, et dont l'inclinaison est inversée par rapport à l'inclinaison des ailettes 8 et des rebords 24.On the other hand, each end of the primary beams 3 has, in its lower part, a chamfer 31 disposed behind and close to the hooking nozzles 10, and the inclination of which is reversed relative to the inclination of the fins 8 and ledges 24.

Claims (5)

Système portant modulaire pour coffrage de dalles en béton, du genre comprenant : - des étais ou poteaux d'étaiement (1), du type à tête tombante (2) ; - des poutres primaires ou poutres porteuses (3) comportant, latéralement, des gorges longitudinales (9) et destinées à s'accrocher sur les têtes (2) des étais ou poteaux (1) par l'intermédiaire de leurs abouts (5) munis d'ergots d'accrochage (10) ; - des poutres secondaires (4) appelées à s'accrocher sur les poutres primaires (3) par l'intermédiaire de leurs abouts (5') munie d'ergots d'accrochage ; la tête tombante (2) des étais (1) comprenant une colonne fixe (16) munie, à son sommet, d'une plaque (19) destinée à l'appui du contreplaqué constituant la peau coffrante (33), et un support (17) monté avec une aptitude de mouvement axial autour de ladite colonne fixe (16) et comportant une platine d'accrochage (22) pour l'accrochage des abouts (5) de poutres primaires (3), caractérisé en ce que ladite tête tombante comprend également une console de soutien (23) disposée au-dessus et à distance de la platine d'accrochage (22), et en ce que les abouts (5) des poutres primaires (3) comportent, au-dessus et à distance de leur ergot d'accrochage (10), un bossage (11) présentant une surface d'appui (11a) destinée à reposer sur ladite console de soutien (23) des étais.Modular bearing system for formwork of concrete slabs, of the type comprising: - props or shoring posts (1), of the drop head type (2); - primary beams or load-bearing beams (3) comprising, laterally, longitudinal grooves (9) and intended to hang on the heads (2) of the props or posts (1) by means of their provided ends (5) hooking lugs (10); - secondary beams (4) called to hang on the primary beams (3) by means of their ends (5 ') provided with hooking lugs; the drooping head (2) of the props (1) comprising a fixed column (16) provided, at its top, with a plate (19) intended to support the plywood constituting the formwork skin (33), and a support ( 17) mounted with an axial movement ability around said fixed column (16) and comprising a hooking plate (22) for hooking the ends (5) of primary beams (3), characterized in that said drooping head also comprises a support console (23) disposed above and at a distance from the hooking plate (22), and in that the ends (5) of the primary beams (3) comprise, above and at a distance from their hooking lug (10), a boss (11) having a bearing surface (11a) intended to rest on said support console (23) of the stays. Système portant modulaire pour coffrage de dalles en béton, selon la revendication 1, caractérisé en ce que la colonne fixe (16) de l'étai comporte également une plaque de butée (20) disposée au-dessous de la plaque supérieure fixe (19) et au-dessus de la console de soutien (23), cette plaque de butée (20) s'opposant au soulèvement des poutres primaires (3) accrochées sur la tête tombante (2) lorsque celle-ci se trouve en position haute.Modular bearing system for formwork of concrete slabs, according to claim 1, characterized in that the fixed column (16) of the forestay also includes a stop plate (20) arranged below the fixed upper plate (19) and above the support console (23), this stop plate (20) opposing the lifting of the primary beams (3) hung on the drooping head (2) when the latter is in the high position. Système portant modulaire pour coffrage de dalles en béton, selon l'une des revendications 1 ou 2, caractérisé en ce que la distance (D3) comprise entre les ergots d'accrochage (10) et la base (11a) des bossages d'appui (11) des poutres primaires (3), est sensiblement égale à la distance (D4) comprise entre le rebord (24) de la platine d'accrochage (22) et la surface d'appui de la console de soutien (23) de la tête tombante (2) des étais (1).Modular bearing system for formwork of concrete slabs, according to one of claims 1 or 2, characterized in that the distance (D3) between the lugs (10) and the base (11a) of the support bosses (11) of the primary beams (3), is substantially equal to the distance (D4) between the flange (24) of the attachment plate (22) and the bearing surface of the support console (23) of the drooping head (2) of the props (1). Système portant modulaire pour coffrage de dalles en béton, selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les extrémités des poutres utilisées comme poutres primaires (3) présentent, dans leur partie inférieure, un chanfrein (31) disposé en arrière et à proximité des ergots d'accrochage (10).Modular bearing system for formwork of concrete slabs, according to any one of claims 1 to 3, characterized in that the ends of the beams used as primary beams (3) have, in their lower part, a chamfer (31) arranged in rear and close to the hooking pins (10). Coffrage modulaire pour dalles en béton, caractérisé en ce qu'il comporte un système portant modulaire selon l'une quelconque des revendications 1 à 4.Modular formwork for concrete slabs, characterized in that it comprises a modular bearing system according to any one of claims 1 to 4.
EP96116162A 1991-04-30 1992-04-30 Modular supporting system for concrete floor shutterings Withdrawn EP0751268A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9105653 1991-04-30
FR9105653A FR2676082B1 (en) 1991-04-30 1991-04-30 MODULAR BEARING SYSTEM FOR SLAB FORMWORK, METHOD AND FORMWORK USING SUCH A SYSTEM.
EP92430014A EP0511921A1 (en) 1991-04-30 1992-04-30 Modular supporting system for floor forms; method and form using this system

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EP96116162A Withdrawn EP0751268A2 (en) 1991-04-30 1992-04-30 Modular supporting system for concrete floor shutterings
EP92430014A Withdrawn EP0511921A1 (en) 1991-04-30 1992-04-30 Modular supporting system for floor forms; method and form using this system

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EP3798387A1 (en) 2019-09-26 2021-03-31 Sistemas Técnicos de Encofrados, S.A. Support system for formworks
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Also Published As

Publication number Publication date
FR2676082B1 (en) 1997-08-29
EP0751268A3 (en) 1997-02-12
EP0511921A1 (en) 1992-11-04
FR2676082A1 (en) 1992-11-06

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