FR2653807A1

FR2653807A1 - Double clamp for concrete formworks

Info

Publication number: FR2653807A1
Application number: FR8914552A
Authority: FR
Inventors: Monetta Pierre
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-10-31
Filing date: 1989-10-31
Publication date: 1991-05-03
Anticipated expiration: 1995-10-31
Also published as: FR2653807B3

Abstract

The present invention relates to a double clamp for concrete formworks. It consists of a combination of a clamp formed by a fixed jaw (2) and a movable jaw (3) manoeuvred by an articulated lever of the suitcase closure type, permitting the locking and clamping and also the unlocking in a single manoeuvre, with a crossbar (5), if appropriate adjustable in length, sliding on the part connecting the two jaws and ensuring the spacing of the panels by virtue of two counter-jaws (6, 7) of reduced size, in order to be extracted easily from the concrete after setting. It is intended to hold the two panels of a formwork during the casting of the concrete.

Description

La présente invention a pour objet un serre-joints double pour coffrages à béton.The present invention relates to a double clamp for concrete formwork.

Il est destiné à maintenir les deux banches d'un coffrage pendant la coulée du béton.It is intended to hold the two forms of a formwork during the pouring of the concrete.

Les dispositifs réalisés à ce jour ont généralement recours à des tiges filetées traversant les deux banches, fixées par deux écrous, et portant des entretoises irrécupérables noyées dans le béton.The devices produced to date generally use threaded rods passing through the two forms, fixed by two nuts, and carrying irrecoverable spacers embedded in the concrete.

Ce système exige un temps de main-d'oeuvre important, aussi bien au montage qu'au démontage.De plus, le béton s'infiltre souvent dans les trous traversant les banches et vient recouvrir le filetage des tiges, ce qui entraîne des manipulations supplémentaires de nettoyage entre deux coulées. Dans les coffrages de faible importance, il est parfois fait appel à des serre-joints à vis disposés autour du moule, l'écartement étant obtenu à I' aide de cales, en général en bois, qu' il est très difficile de récupérer au décoffrage.This system requires significant labor time, both during assembly and disassembly. In addition, concrete often infiltrates the holes passing through the formwork and covers the threads of the rods, which leads to manipulations. additional cleaning between two flows. In small formwork, screw clamps are sometimes used around the mold, the spacing being obtained by means of shims, generally made of wood, which it is very difficult to recover at formwork.

Le dispositif suivant la présente invention supprime ces inconvénients. En effet, il permet, en utilisant uniquement des serrejoints, entièrement récupérables et réutilisables, de régler l'écartement et de maintenir les deux banches, la mise en place d'un serre-joints étant réalisée avec un seul geste, ce qui se traduit par un gain de temps très important, sans compter les économies réalisées du fait qu'il n'y a aucune pièce perdue.The device according to the present invention eliminates these drawbacks. Indeed, it allows, using only clamps, fully recoverable and reusable, to adjust the spacing and maintain the two forms, the establishment of a clamp is performed with a single gesture, which translates by a very significant time saving, without counting the savings made by the fact that there is no lost part.

Il est constitué par la combinaison d'un serre-joints formé d'une mâchoire fixe et d'une mâchoire mobile manoeuvrée par une "genouillère" de type fermeture de valise, permettant le blocage et le serrage, ainsi que le déblocage d'un seul geste; avec une entretoise, éventuellement réglable en longueur, coulissant sur la partie reliant les deux mâchoires et assurant l'écartement des banches grace à deux contre-mâchoires de taille réduite pour pouvoir être extraites facilement du béton après la prise.It consists of the combination of a clamp formed by a fixed jaw and a movable jaw operated by a "toggle" type closure of the case, allowing the blocking and tightening, as well as the unlocking of a single gesture; with a spacer, possibly adjustable in length, sliding on the part connecting the two jaws and ensuring the spacing of the formwork thanks to two reduced-size counter-jaws to be able to be easily extracted from the concrete after setting.

Sur les dessins annexés, donnés à titre d'exemple non limitatif, d'une des formes de réalisation de l'objet de l'invention:
La figure 1 montre le dispositif dans son ensemble, vu de côté.In the accompanying drawings, given by way of nonlimiting example, of one of the embodiments of the subject of the invention:
Figure 1 shows the device as a whole, seen from the side.

La figure 2 représente le dispositif vu de dessus. Figure 2 shows the device seen from above.

La figure 3 est une coupe transversale suivant les flèches A-A de la figure 1.FIG. 3 is a cross section along the arrows A-A of FIG. 1.

La figure 4 représente une variante de la mâchoire mobile.Figure 4 shows a variant of the movable jaw.

Le dispositif, figure 1 à 3, est constitué d'une traverse 1 et d'une mâchoire fixe 2 en fer à U soudées perpendiculairement l'une à l'autre, et d'une mâchoire mobile 3, également en fer à U, comportant à sa partie supérieure un élément tubulaire 4 soudé venant s 'emboîter en coulissant sur 1' extrémité de la traverse opposée à la machoire fixe 2. Une entretoise 5, de section en "C", équipée de deux contre-mâchoires 6, 7, pout coulisser sur la traverse 1.The device, FIGS. 1 to 3, consists of a cross member 1 and a fixed jaw 2 made of U-shaped iron welded perpendicularly to one another, and of a movable jaw 3, also made of U-shaped iron, comprising at its upper part a welded tubular element 4 which fits by sliding on the end of the cross member opposite the fixed jaw 2. A spacer 5, of "C" section, equipped with two counter-jaws 6, 7 , to slide on the cross member 1.

Sur l'élément tubulaire 4 sont fixées deux platines 8 sur lesquelles est articulée une poignée 9 à deux axes 10 reliant les platines 8 à deux pièces parallèles 11 prolongeant ladite poignée. Ces pièces parallèles portent un axe excentrique 12 pourvu d'un taraudage transversal 13 dans lequel se visse une tige filetée 14 terminée par un anneau 15 s ' enclenchant sur un crochet 16 soudé sur la traverse 1. Le vissage ou le dévissage de la tige filetée 14 permet de régler l'écartement des mâchoires 2 et 3.On the tubular element 4 are fixed two plates 8 on which is hinged a handle 9 with two axes 10 connecting the plates 8 to two parallel parts 11 extending said handle. These parallel parts carry an eccentric axis 12 provided with a transverse thread 13 into which a threaded rod 14 is screwed terminated by a ring 15 s' engaging on a hook 16 welded on the crosspiece 1. The screwing or unscrewing of the threaded rod 14 adjusts the spacing of the jaws 2 and 3.

La mise en place du serre-joints objet de l'invention se fait en relevant la poignée 9, ce qui permet d ' écarter (et éventuellement de séparer) les deux mâchoires 2 et 3, la traverse 1 est alors posée sur les bords des banches 17, 18 avec l'entretoise 5 située entre elles. Il suffit alors de rabattre la poignée 9 sur l'élément tubulaire 4, ce qui tire la tige filetée et rapproche les mâchoires fixe 1 et mobile 2 et immobilise les deux banches 17, 18 entre les mâchoires et contre-mâchoires de 1' entretoise 5 dont la distance fixe l'écartement des banches, et par conséquent l'épaisseur du mur.The establishment of the clamp object of the invention is done by raising the handle 9, which allows to separate (and possibly separate) the two jaws 2 and 3, the cross member 1 is then placed on the edges of formwork 17, 18 with the spacer 5 located between them. It then suffices to fold the handle 9 onto the tubular element 4, which pulls the threaded rod and brings the fixed 1 and movable jaws 2 closer together and immobilizes the two forms 17, 18 between the jaws and counter-jaws of the spacer 5 the distance of which fixes the spacing of the forms, and consequently the thickness of the wall.

Suivant une variante d' exécution, l'entretoise 5 est constituée de deux parties coulissant l'une sur l'autre et dont les positions relatives sont fixées par une cheville se plaçant dans des trous prévus dans lesdites parties coulissantes, de manière à pouvoir faire varier la longueur de l'entretoise.According to an alternative embodiment, the spacer 5 consists of two parts sliding one on the other and whose relative positions are fixed by a pin placed in holes provided in said sliding parts, so as to be able to make vary the length of the spacer.

Suivant une autre variante d'exécution, figure 4, l'élément tubulaire 4 est remplacé par une plaque 20 soudée perpendiculairement sur la mâchoire mobile 3 et coulissant dans deux rainures 21 pratiquées à l'intérieur des côtés de la traverse 1.According to another alternative embodiment, FIG. 4, the tubular element 4 is replaced by a plate 20 welded perpendicularly to the movable jaw 3 and sliding in two grooves 21 formed inside the sides of the cross member 1.

Le dispositif qui vient d' être décrit se prête particulièrement bien à la réalisation d'ouvrages en béton d'importance faible ou moyenne, telle que la confection de piscines ou de m-aisons individuelles.The device which has just been described lends itself particularly well to the production of concrete works of low or medium importance, such as the construction of swimming pools or individual rooms.

Le positionnement des divers éléments constitutifs donnent à ce dispositif un maximum d' effets utiles qui n ' avaient pas été obtenus à ce jour par des dispositifs similaires. The positioning of the various constituent elements gives this device a maximum of useful effects which had not been obtained to date by similar devices.

Claims

RESELL ICAT IONS

10 Double clamps for concrete forms, intended to hold the two forms of a formwork during the pouring of concrete, intended to allow a significant saving of labor, characterized by the combination of a clamp joints formed by a fixed jaw (2) and a movable jaw (3) operated by a "toggle" of the case closure type, allowing locking and tightening, as well as unlocking, in a single movement, with a spacer (5) sliding on the crosspiece (1) connecting the two jaws and ensuring the spacing of the formwork thanks to two counter-jaws (6, 7) of reduced size to be able to be easily extracted from the concrete after setting.

20 Device according to claim 1, characterized in that the fixed (2) and movable (3) jaws, as well as the crosspiece (1) are made of U-iron, the fixed jaw (2) being welded perpendicularly to the crosspiece (1), and that the spacer (5) is of "C" section.

30 Device according to any one of the preceding claims, characterized in that the movable jaw (3) has at its upper part a tubular element (4) welded, coming into engagement by sliding on the end of the cross-member (1 ) opposite the fixed jaw (2).

40 Device according to claims 1 and 2, characterized in that the movable jaw (3) has at its upper part a plate (20) Figure 4, welded perpendicularly and sliding in two grooves (21) formed inside the sides of the crossmember (1).

5 Device according to any one of the preceding claims, characterized in that the "toggle" is formed by a handle (9), extended by two parallel parts (11) articulated on two plates (8), fixed on the upper part of the movable jaw (3) by means of two axes (10), said parallel parts (11) carrying an eccentric axis (12) provided with a transverse thread (13) into which a threaded rod (14) is screwed, terminated by a ring (15) engaging on a hook (16) welded to the crosspiece (1), the screwing or unscrewing of the threaded rod (14) making it possible to adjust the spacing of the jaws (2) and (3 ).

60 Device according to any one of the preceding claims, characterized in that the spacer (5) consists of two parts sliding one over the other and whose relative positions are fixed by a pin placed in the holes provided in said sliding parts, so that the length of the spacer can be varied.