EP0498742A1 - Arrangement for provisionally supporting a lifting element on a metallic forming surface during pouring and hardening of a prefabricated concrete element - Google Patents

Arrangement for provisionally supporting a lifting element on a metallic forming surface during pouring and hardening of a prefabricated concrete element Download PDF

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Publication number
EP0498742A1
EP0498742A1 EP92420027A EP92420027A EP0498742A1 EP 0498742 A1 EP0498742 A1 EP 0498742A1 EP 92420027 A EP92420027 A EP 92420027A EP 92420027 A EP92420027 A EP 92420027A EP 0498742 A1 EP0498742 A1 EP 0498742A1
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EP
European Patent Office
Prior art keywords
intended
lifting member
slot
formwork
reservation
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Withdrawn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
EP92420027A
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German (de)
French (fr)
Inventor
Pierre Roire
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A MURE ETS
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A MURE ETS
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Publication date
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Publication of EP0498742A1 publication Critical patent/EP0498742A1/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
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/04—Cores for anchor holes or the like around anchors embedded in the concrete

Definitions

  • the present invention relates to a device for temporarily holding a lifting member on a metal formwork surface during the phases of pouring and setting the concrete of a precast concrete element.
  • the lifting points can be constituted either by simple mild steel pins or by various specific lifting elements, embedded in the concrete, associated or not with a reinforcing bar. anchoring.
  • the lifting member is constituted by a threaded bush, it is suitable; during the pouring of the concrete and the setting time of the latter, ensuring the fixing of the socket to the formwork by suitable means, it being specified that the formwork can be made of wood, sometimes of synthetic material, but more generally of metal.
  • Known means allowing the provisional holding of a threaded socket are constituted, for example by a simple bolt passing through the formwork, and ensuring the holding of the socket by its thread.
  • This method of fixing deteriorates the formwork and requires reconditioning for later use, this reconditioning being long and expensive.
  • the socket support does not pass through the formwork, and is constituted by a part serving to hold the socket, and by a part serving for temporary fixing to the formwork.
  • This socket support can be made of a single material, synthetic material or metal, for attachment to a wooden formwork, or else of a material having inclusions of magnets, several small magnets or a single larger diameter magnet, for fixing on a metal formwork.
  • the junction between the temporary socket support and the socket is made by introducing a cylindrical part which can be either threaded or smooth, inside the body of the socket.
  • the object of the invention is to provide a device which, overcoming the drawbacks of known devices, provides temporary fixing to a metal formwork of lifting members and, in particular, of eye anchors and head anchors, which is reliable and resistant, which does not degrade the formwork, which offers mold release facilities, which ensures sealing against the penetration of milt, and which undergoes no deformation during its installation and its removal out of the molded element.
  • the device which it relates to comprises a part having a flat face which, intended to come to bear against the metal formwork surface, is equipped with magnets, and is extended by a profiled part intended to provide a reservation in the concrete element, this part comprising on the one hand, opening in its face opposite to the plane face and orthogonally to the latter, a recess intended to allow the passage with sealing of the lifting member, and on the other hand, opening in its flat face a slot in which is pivotally mounted about an axis transverse to the slot, an element of which a part forms a lock intended to secure, when the element is in the retracted position in the slot, the retention of the free end of the lifting member, means being provided for actuating the locking element from its locked position to its unlocked position.
  • the element forming a lock being in the unlocked position, the lifting member is introduced into the interior of the profiled part, then the lock is closed, and the assembly is fixed. on the formwork by the action of the magnets. After the pouring, setting of the concrete, and formwork removal operations, the bolt element is actuated in a direction of release of the lifting member, and the profiled part is withdrawn from the concrete element, which thus reveals a reservation into which the lifting member opens.
  • the part intended to spare the reservation is made of a rigid and non-brittle synthetic material.
  • the magnets associated with the part forming the reservation are at least two in number and are arranged symmetrically with respect to the zone thereof intended to receive the lifting member.
  • the flat face of the part intended to make the reservation is delimited by a peripheral shoulder turned towards the metal surface of the formwork, intended to prevent the penetration of laitance on the flat face.
  • the part intended to carry out the reservation has a general hemispherical shape, the bottom of which, in the form of a hull, has an edge delimited by substantially flat surfaces.
  • This shape of the part intended to form the reservation facilitates its removal from the concrete, avoiding the suction cup effect.
  • the articulation axis of the locking element is located approximately halfway along the slot intended to receive it, substantially in the extension of the lifting member, this element comprising a part profile forming a ramp which, when the element is pivoted towards its unlocking position, is intended to come to bear against the upper edge of the lifting member.
  • the means intended to ensure the actuation of the locking element consist of a ring, mounted articulated on the element around an axis parallel to the axis of articulation thereof, near its end intended to protrude out of the slot in the unlocked position, this ring being retractable along the flat face of the profiled part when the latter is fixed against a metal formwork surface.
  • the lifting member is constituted by an eye anchor, that is to say a member whose end is of rectangular section and has a transverse hole
  • the locking element has a hook-shaped part intended to penetrate this hole
  • the recess in the profiled part is of rectangular section corresponding to that of the end of the lifting member, and its edge is delimited by a shoulder intended to lean against the end of the lifting member.
  • the element of locking comprises a fork-shaped part intended to come to cover the rod and to bear under the head of the lifting member, the recess formed in the profiled part is of circular section adapted to the section of the head enlarged, and a split ring surrounding the rod of the anchor is intended to seal between the rod and the bottom of the profiled part.
  • FIG. 1 represents an element 2 of reinforced concrete, equipped with two lifting members 3, constituted for example by eye anchors.
  • FIG. 2 shows an eye anchor designated by the general reference 3, the free end 4 of which has a substantially rectangular section, and is crossed by a transverse hole 5 or eye.
  • the end 4 of the anchor 3 is intended to protrude into the bottom of a reservation 6 that comprises the element 2.
  • a device comprising a part 7 made of rigid, but not brittle, synthetic material, such as a polyurethane, having a flat face 8, delimited by a shoulder 9, and a substantially hemispherical profiled part.
  • This profiled part has a bottom in the form of an hull having an edge 10, delimited by substantially flat surfaces 12.
  • the flat face 8 of the part 7 are formed four recesses, in which are housed four magnets 13 arranged symmetrically with respect to the axis of the part. These magnets 13 are intended to secure the part to a metal surface 14 of a formwork.
  • a recess 15 of generally rectangular shape into which can be engaged with sealing the end 4, of rectangular section, of the lifting member 3.
  • the edge delimiting this rectangular recess 15, on the side of the base of the part 7, is provided with a shoulder 16 intended to prevent the penetration of milt between the end 4 and the part 7.
  • a slot 17 which extends to the level of the upper part of the lifting member 3, and in which is pivotally mounted about an axis 18, transverse to the slot, an element 19 forming a lock for the lifting member 3.
  • the axis 18 of the element 19 is located in the extension of the lifting member 3, and the element 19 comprises a hook-shaped part 20, intended to come s 'engage inside the eye 5 of the lifting member 3.
  • the element 19 is shaped so that when the hook 20 is engaged inside the eye 5, as is the case in Figures 2 and 4, the element 19 is fully retracted inside the slot 17, one of its edges flush with the flat face 8 of the element 7.
  • Near one of the ends of the element 19 is articulated around an axis 22 parallel to the axis 18 of the locking element 19, a ring 23 capable of pivoting between a retracted position, shown in FIGS. 2 and 4, in which it does not exceed not of the flat face 8 of the part 7, and a position pivoted about 90 degrees outwards, in which it forms an action member swivel element 19.
  • the element 19 also comprises a profiled portion 24 in the form of a ramp, disposed above the hook 20, and which, when the element 19 is pivoted from the locked position to the unlocked position, is supported against the upper edge of the lifting member 3, as best shown in FIG. 5, and tends to cause the part 7 to come out of the reservation 6 which it has just formed in the concrete.
  • the element 19 is first of all tilted towards its unlocked position, before introduction of the lifting member 3 inside the part 7. After positioning the end 5 of the member 3 in the part 7, the element 19 is tilted to its locking position, that is to say in which the hook 20 is engaged in the eye 5 of the lifting member 3.
  • the ring 23 is retracted into the recess provided to receive it.
  • the assembly is fixed against the metal face of a formwork 14, as shown in FIG. 4, after which the concrete is poured, and the setting of the latter before formwork is removed.
  • the ring 23 is tilted by approximately 90 degrees which can be grasped to tilt the element 19 to its unlocked position, as shown in FIG.
  • FIG. 6 represents an alternative embodiment of this device, intended for the temporary maintenance of a lifting member constituted by a head anchor.
  • a recess 26 of circular section intended for the passage of the upper end of the lifting member which comprises a cylindrical rod 27 equipped with an enlarged head 28.
  • the recess 26 is of section corresponding to that of the enlarged head.
  • the lower end of the recess 26 is separated by a shoulder 29 from an area 30 of larger section, used for the establishment of a split ring 32 which sealingly surrounds the rod 27, and which is supported with sealing in the enlarged part 30 of the recess.
  • the locking element 19 has the same general structure as that described above, and has a locking member constituted by a fork 33, the two branches of which are intended to pass on either side of the rod 27, under enlarged head 28.
  • this device is identical to that which has been described previously in the case of eye anchors, except that it is necessary to install the sealing ring 32 before pouring the concrete, and to remove this ring, after removal of the provisional holding system.
  • the invention brings a great improvement to the existing technique, by providing a device for the temporary maintenance of a lifting member on a metal formwork surface, which has a simple structure, of a high reliability, which is not deteriorated during successive uses, and which does not deteriorate the formwork on which it is fixed.

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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)
  • Moulds, Cores, Or Mandrels (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

This device comprises a part (7) which is intended to form a pocket inside the concrete component (2) and is equipped with magnets (13) for fixing onto a metal formwork surface. The part comprises, on the one hand, a recess (15) which is intended to allow the sealed passage of the lifting element (2, 4, 27) and which emerges at the face of the part opposite the plane face (8) and orthogonally to the latter, and, on the other hand, a slot (17) which merges at the plane face of the part and in which a component (19) is mounted so that it may pivot about an axis which is transverse to the slot, which component comprises a portion (20) forming a bolt which is intended, when the component is retracted into the slot, to retain the free end of the lifting element. …<??>Application to the equipment of precast concrete components. …<IMAGE>…

Description

La présente invention a pour objet un dispositif pour le maintien provisoire d'un organe de levage sur une surface métallique de coffrage pendant les phases de coulée et de prise du béton d'un élément en béton préfabriqué.The present invention relates to a device for temporarily holding a lifting member on a metal formwork surface during the phases of pouring and setting the concrete of a precast concrete element.

La manutention d'éléments préfabriqués en béton armé nécessite le ménagement dans ceux-ci de points de levage en nombre suffisant, et correctement positionnés, de telle sorte que ces éléments soient stables pendant leurs déplacements.The handling of prefabricated reinforced concrete elements requires the provision in these of sufficient lifting points, and correctly positioned, so that these elements are stable during their movements.

Les points de levage peuvent être constitués, suivant la configuration des éléments en béton armé, soit par de simples épingles en acier doux, soit par divers organes spécifiques de levage, noyés dans le béton, associés ou non avec une barre d'armature d'ancrage.Depending on the configuration of the reinforced concrete elements, the lifting points can be constituted either by simple mild steel pins or by various specific lifting elements, embedded in the concrete, associated or not with a reinforcing bar. anchoring.

Les systèmes de levage procèdent actuellement de trois techniques :

  • par élingue vissée sur une douille taraudée,
  • par élingue crochetée sur une ancre à oeil,
  • par élingue crochetée sur une ancre à tête.
Lifting systems currently use three techniques:
  • by sling screwed onto a threaded socket,
  • by hook sling on an eye anchor,
  • by hooked sling on a head anchor.

Dans le cas où l'organe de levage est constitué par une douille taraudée, il convient; pendant la coulée du béton et la durée de prise de celui-ci, d'assurer la fixation de la douille au coffrage par des moyens adaptés, étant précisé que les coffrages peuvent être en bois, parfois en matière synthétique, mais plus généralement métalliques.In the case where the lifting member is constituted by a threaded bush, it is suitable; during the pouring of the concrete and the setting time of the latter, ensuring the fixing of the socket to the formwork by suitable means, it being specified that the formwork can be made of wood, sometimes of synthetic material, but more generally of metal.

Des moyens connus permettant le maintien provisoire d'une douille taraudée sont constitués, par exemple par un simple boulon traversant le coffrage, et assurant la tenue de la douille par son filetage.Known means allowing the provisional holding of a threaded socket are constituted, for example by a simple bolt passing through the formwork, and ensuring the holding of the socket by its thread.

Ce mode de fixation détériore le coffrage et nécessite une remise en état pour une utilisation ultérieure, cette remise en état étant longue et onéreuse.This method of fixing deteriorates the formwork and requires reconditioning for later use, this reconditioning being long and expensive.

Selon une autre possibilité, le support de douille ne traverse pas le coffrage, et est constitué par une partie servant au maintien de la douille, et par une partie servant de fixation provisoire au coffrage. Ce support de douille peut être réalisé dans un seul matériau, matière synthétique ou métal, pour une fixation sur un coffrage bois, ou alors dans un matériau possédant des inclusions d'aimants, plusieurs petits aimants ou un seul aimant de diamètre plus important, pour une fixation sur un coffrage métallique.According to another possibility, the socket support does not pass through the formwork, and is constituted by a part serving to hold the socket, and by a part serving for temporary fixing to the formwork. This socket support can be made of a single material, synthetic material or metal, for attachment to a wooden formwork, or else of a material having inclusions of magnets, several small magnets or a single larger diameter magnet, for fixing on a metal formwork.

La jonction entre le support provisoire de douille et la douille se fait par introduction d'une partie cylindrique qui peut être soit filetée, soit lisse, à l'intérieur du corps de la douille.The junction between the temporary socket support and the socket is made by introducing a cylindrical part which can be either threaded or smooth, inside the body of the socket.

Toutefois, les systèmes présentant une partie cylindrique lisse, serrant par frottements, offrent l'inconvénient d'autoriser la pénétration de laitance dans les filets de la douille, au moment de la coulée du béton, et plus particulièrement au moment de la vibration de celui-ci. La laitance durcie s'oppose ensuite au vissage normal de l'élingue, le mauvais accrochage qui en résulte se traduisant parfois par le décrochage de la douille vis-à-vis de l'élingue et, par suite, par la chute de l'élément en béton qui est manipulé, ce qui présente des risques importants pour le personnel manipulateur. Ce système de levage est donc de moins en moins utilisé.However, systems having a smooth cylindrical part, tightening by friction, offer the disadvantage of allowing the penetration of milt into the threads of the socket, at the time of the pouring of the concrete, and more particularly at the time of the vibration of that -this. The hardened milt then opposes the normal screwing of the sling, the poor hooking which results therefrom sometimes resulting in the detachment of the sleeve vis-à-vis the sling and, consequently, by the fall of the concrete element which is handled, which presents significant risks for the handling staff. This lifting system is therefore used less and less.

Les moyens connus permettant le maintien provisoire à l'intérieur d'un coffrage des ancres à oeil et des ancres à tête sont :

  • soit du type hémisphérique en polystyrène, fixé par collage dans le coffrage et ne servant qu'une fois,
  • soit du type hémisphérique en acier à fixer par vissage ou soudage, ce qui détériore le coffrage, et nécessite une remise en état longue et coûteuse pour une utilisation ultérieure,
  • soit encore du type hémisphérique en matière synthétique souple, nécessitant le perçage du coffrage, et présentant l'inconvénient supplémentaire d'une usure très rapide avec un nombre d'utilisations très limité du fait des moyens de démoulage qui créent des contraintes localisées très élevées dans le matériau constitutif de la fixation.
The known means allowing temporary anchoring with eye anchors and head anchors inside a formwork are:
  • either of the hemispherical polystyrene type, fixed by gluing in the formwork and used only once,
  • either of the hemispherical type of steel to be fixed by screwing or welding, which deteriorates the formwork, and requires long and costly reconditioning for later use,
  • or again of the hemispherical type made of flexible synthetic material, requiring the drilling of the formwork, and having the additional drawback of very rapid wear with a very limited number of uses due to the release means which create very high localized stresses in the material of the fastener.

Le but de l'invention est de fournir un dispositif qui, remédiant aux inconvénients des dispositifs connus, assure une fixation provisoire sur un coffrage métallique d'organes de levage et, notamment, d'ancres à oeil et d'ancres à tête, qui soit fiable et résistant, quine dégrade pas le coffrage, qui offre des facilités de démoulage, qui assure l'étanchéité face à la pénétration de la laitance, et quine subit aucune déformation lors de sa mise en place et de son enlèvement hors de l'élément moulé.The object of the invention is to provide a device which, overcoming the drawbacks of known devices, provides temporary fixing to a metal formwork of lifting members and, in particular, of eye anchors and head anchors, which is reliable and resistant, which does not degrade the formwork, which offers mold release facilities, which ensures sealing against the penetration of milt, and which undergoes no deformation during its installation and its removal out of the molded element.

A cet effet, le dispositif qu'elle concerne, comprend une pièce présentant une face plance qui, destinée à venir prendre appui contre la surface métallique de coffrage, est équipée d'aimants, et se prolonge par une partie profilée destinée à ménager une réservation dans l'élément en béton, cette pièce comportant d'une part, débouchant dans sa face opposée à la face plane et orthogonalement à celle-ci, un évidement destiné à permettre le passage avec étanchéité de l'organe de levage, et d'autre part, débouchant dans sa face plane une fente dans laquelle est monté pivotant autour d'un axe transversal à la fente, un élément dont une partie forme un verrou destiné à assurer, lorsque l'élément est en position escamotée dans la fente, la retenue de l'extrémité libre de l'organe de levage, des moyens étant prévus pour assurer l'actionnement de l'élément de verrouillage de sa position verrouillée à sa position déverrouillée.To this end, the device which it relates to, comprises a part having a flat face which, intended to come to bear against the metal formwork surface, is equipped with magnets, and is extended by a profiled part intended to provide a reservation in the concrete element, this part comprising on the one hand, opening in its face opposite to the plane face and orthogonally to the latter, a recess intended to allow the passage with sealing of the lifting member, and on the other hand, opening in its flat face a slot in which is pivotally mounted about an axis transverse to the slot, an element of which a part forms a lock intended to secure, when the element is in the retracted position in the slot, the retention of the free end of the lifting member, means being provided for actuating the locking element from its locked position to its unlocked position.

En pratique, l'élément formant verrou étant en position déverrouillée, il est procédé à l'introduction de l'organe de levage à l'intérieur de la pièce profilée, puis à la fermeture du verrou, et à la fixation de l'ensemble sur le coffrage par action des aimants. Après les opérations de coulée, de prise du béton, et de décoffrage, il est procédé à l'actionnement de l'élément formant verrou dans un sens de libération de l'organe de levage, et au retrait de la pièce profilée hors de l'élément en béton, qui laisse ainsi apparaître une réservation dans laquelle débouche l'organe de levage.In practice, the element forming a lock being in the unlocked position, the lifting member is introduced into the interior of the profiled part, then the lock is closed, and the assembly is fixed. on the formwork by the action of the magnets. After the pouring, setting of the concrete, and formwork removal operations, the bolt element is actuated in a direction of release of the lifting member, and the profiled part is withdrawn from the concrete element, which thus reveals a reservation into which the lifting member opens.

Selon une caractéristique de l'invention, la pièce destinée à ménager la réservation est réalisée en une matière synthétique rigide et non cassante.According to a characteristic of the invention, the part intended to spare the reservation is made of a rigid and non-brittle synthetic material.

En outre, les aimants associés à la pièce formant la réservation sont au moins au nombre de deux et sont disposés de façon symétrique par rapport à la zone de celle-ci destinée à recevoir l'organe de levage. Avantageusement, la face plane de la pièce destinée à réaliser la réservation est délimitée par un épaulement périphérique tourné du côté de la surface métallique du coffrage, destiné à éviter la pénétration de laitance sur la face plane. Selon une forme préférée d'exécution, la pièce destinée à réaliser la réservation possède une forme générale hémisphérique dont le fond, en forme de carêne, comporte une arête délimitée par des surfaces sensiblement planes.In addition, the magnets associated with the part forming the reservation are at least two in number and are arranged symmetrically with respect to the zone thereof intended to receive the lifting member. Advantageously, the flat face of the part intended to make the reservation is delimited by a peripheral shoulder turned towards the metal surface of the formwork, intended to prevent the penetration of laitance on the flat face. According to a preferred embodiment, the part intended to carry out the reservation has a general hemispherical shape, the bottom of which, in the form of a hull, has an edge delimited by substantially flat surfaces.

Cette forme de la pièce destinée à former la réservation facilite son retrait hors du béton, en évitant l'effet de ventouse.This shape of the part intended to form the reservation facilitates its removal from the concrete, avoiding the suction cup effect.

Conformément à une autre caractéristique de l'invention, l'axe d'articulation de l'élément de verrouillage est situé sensiblement à mi-longueur de la fente destinée à la recevoir, sensiblement dans le prolongement de l'organe de levage, cet élément comportant une partie profilée formant rampe qui, lors du pivotement de l'élément vers sa position de déverrouillage, est destinée à venir prendre appui contre le bord supérieur de l'organe de levage.In accordance with another characteristic of the invention, the articulation axis of the locking element is located approximately halfway along the slot intended to receive it, substantially in the extension of the lifting member, this element comprising a part profile forming a ramp which, when the element is pivoted towards its unlocking position, is intended to come to bear against the upper edge of the lifting member.

Il résulte de cette structure que, lors du basculement de l'élément formant verrou vers sa position d'ouverture, la partie de cet élément formant rampe vient s'arc-bouter contre le bord supérieur de l'organe de levage, favorisant ainsi le dégagement de la pièce profilée hors de la réservation qu'elle vient de ménager dans le béton.It follows from this structure that, during the tilting of the latch element towards its open position, the part of this ramp element braces against the upper edge of the lifting member, thus promoting the clearance of the profiled part outside the reservation it has just made in concrete.

De préférence, les moyens destinés à assurer l'actionnement de l'élément de verrouillage sont constitués par un anneau, monté articulé sur l'élément autour d'un axe parallèle à l'axe d'articulation de celui-ci, à proximité de son extrémité destinée à faire saillie hors de la fente en position déverrouillée, cet anneau étant escamotable le long de la face plane de la pièce profilée lorsque celle-ci est fixée contre une surface métallique de coffrage. Ces moyens d'actionnement de l'élément de verrouillage sont d'une structure simple, et d'une grande efficacité, puisqu'ils ne nécessitent pas l'utilisation d'élément ou d'outils spécifiques complémentaires.Preferably, the means intended to ensure the actuation of the locking element consist of a ring, mounted articulated on the element around an axis parallel to the axis of articulation thereof, near its end intended to protrude out of the slot in the unlocked position, this ring being retractable along the flat face of the profiled part when the latter is fixed against a metal formwork surface. These means of actuating the locking element are of a simple structure, and of great efficiency, since they do not require the use of element or complementary specific tools.

Selon une première possibilité, dans le cas où l'organe de levage est constitué par une ancre à oeil, c'est-à-dire un organe dont l'extrémité est de section rectangulaire et comporte un trou transversal, l'élément de verrouillage comporte une partie en forme de crochet destinée à pénétrer dans ce trou, l'évidement ménagé dans la pièce profilée est de section rectangulaire correspondant à celle de l'extrémité de l'organe de levage, et son bord est délimité par un épaulement destiné à prendre appui de façon étanche contre l'extrémité de l'organe de levage.According to a first possibility, in the case where the lifting member is constituted by an eye anchor, that is to say a member whose end is of rectangular section and has a transverse hole, the locking element has a hook-shaped part intended to penetrate this hole, the recess in the profiled part is of rectangular section corresponding to that of the end of the lifting member, and its edge is delimited by a shoulder intended to lean against the end of the lifting member.

Selon une autre possibilité, dans le cas où l'organe de levage est constitué par une ancre à tête, c'est-à-dire dont l'extrémité est constituée par une tige cylindrique équipée d'une tête élargie, l'élément de verrouillage comporte une partie en forme de fourche destinée à venir coiffer la tige et à prendre appui en-dessous de la tête de l'organe de levage, l'évidement ménagé dans la pièce profilé est de section circulaire adaptée à la section de la tête élargie, et une bague fendue entourant la tige de l'ancre est destinée à assurer l'étanchéité entre la tige et le fond de la pièce profilée.According to another possibility, in the case where the lifting member is constituted by an anchor with a head, that is to say the end of which is constituted by a cylindrical rod equipped with an enlarged head, the element of locking comprises a fork-shaped part intended to come to cover the rod and to bear under the head of the lifting member, the recess formed in the profiled part is of circular section adapted to the section of the head enlarged, and a split ring surrounding the rod of the anchor is intended to seal between the rod and the bottom of the profiled part.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence aux dessins schématiques annexés représentant, à titres d'exemples non limitatifs, deux formes d'exécution de ce dispositif :

  • Figure 1 est une vue en perspective d'une partie d'un élément en béton équipé de deux organes de levage ;
  • Figure 2 est une vue en perspective, à échelle agrandie et partiellement en coupe longitudinale, d'un organe de levage ;
  • Figure 3 est une vue de face de la face plane de ce dispositif ;
  • Figures 4 et 5 sont deux vues en coupe longitudinale de ce dispositif respectivement en cours de coulée du béton, et en cours de démoulage ;
  • Figure 6 est une vue en coupe transversale, d'un second dispositif destiné au maintien d'un organe de levage en forme d'ancre à tête.
In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the appended schematic drawings representing, by way of nonlimiting examples, two embodiments of this device:
  • Figure 1 is a perspective view of part of a concrete element equipped with two lifting members;
  • Figure 2 is a perspective view, on an enlarged scale and partially in longitudinal section, of a lifting member;
  • Figure 3 is a front view of the planar face of this device;
  • Figures 4 and 5 are two views in longitudinal section of this device respectively during the pouring of concrete, and during demolding;
  • Figure 6 is a cross-sectional view of a second device for holding a lifting member in the form of an anchor with head.

La figure 1 représente un élément 2 en béton armé, équipé de deux organes de levage 3, constitués par exemple par des ancres à oeil.FIG. 1 represents an element 2 of reinforced concrete, equipped with two lifting members 3, constituted for example by eye anchors.

La figure 2 représente une ancre à oeil désignée par la référence générale 3, dont l'extrémité libre 4 possède une section sensiblement rectangulaire, et est traversée par un trou transversal 5 ou oeil. L'extrémité 4 de l'ancre 3 est destinée à faire saillie dans le fond d'une réservation 6 que comporte l'élément 2.FIG. 2 shows an eye anchor designated by the general reference 3, the free end 4 of which has a substantially rectangular section, and is crossed by a transverse hole 5 or eye. The end 4 of the anchor 3 is intended to protrude into the bottom of a reservation 6 that comprises the element 2.

Afin d'assurer le maintien de l'organe 3 à l'intérieur du coffrage, et de ménager la réservation 6, il est prévu un dispositif comportant une pièce 7 en matière synthétique rigide, mais non cassante, telle qu'un polyuréthanne, possèdant une face plane 8, délimitée par un épaulement 9, et une partie profilée sensiblement hémisphérique. Cette partie profilée comporte un fond en forme de carêne présentant une arête 10, délimitée par des surfaces 12 sensiblement planes.In order to ensure the maintenance of the member 3 inside the formwork, and to spare the reservation 6, a device is provided comprising a part 7 made of rigid, but not brittle, synthetic material, such as a polyurethane, having a flat face 8, delimited by a shoulder 9, and a substantially hemispherical profiled part. This profiled part has a bottom in the form of an hull having an edge 10, delimited by substantially flat surfaces 12.

Dans la face plane 8 de la pièce 7 sont ménagés quatre évidements, dans lesquels sont logés quatre aimants 13 disposés de façon symétrique par rapport à l'axe de la pièce. Ces aimants 13 sont destinés à assurer la fixation de la pièce sur une surface métallique 14 d'un coffrage.In the flat face 8 of the part 7 are formed four recesses, in which are housed four magnets 13 arranged symmetrically with respect to the axis of the part. These magnets 13 are intended to secure the part to a metal surface 14 of a formwork.

Dans le fond de la pièce 7 débouche un évidement 15 de forme générale rectangulaire, dans lequel peut être engagée avec étanchéité l'extrémité 4, de section rectangulaire, de l'organe de levage 3. A cet effet, le bord délimitant cet évidement rectangulaire 15, du côté de la base de la pièce 7, est muni d'un épaulement 16 destiné à éviter la pénétration de laitance entre l'extrémité 4 et la pièce 7.In the bottom of the part 7 opens a recess 15 of generally rectangular shape, into which can be engaged with sealing the end 4, of rectangular section, of the lifting member 3. For this purpose, the edge delimiting this rectangular recess 15, on the side of the base of the part 7, is provided with a shoulder 16 intended to prevent the penetration of milt between the end 4 and the part 7.

Dans la face 8 de la pièce 7 est ménagée une fente 17 qui s'étend jusqu'au niveau de la partie supérieure de l'organe de levage 3, et dans laquelle est monté pivotant autour d'un axe 18, transversal à la fente, un élément 19 formant verrou pour l'organe de levage 3.In the face 8 of the part 7 is formed a slot 17 which extends to the level of the upper part of the lifting member 3, and in which is pivotally mounted about an axis 18, transverse to the slot, an element 19 forming a lock for the lifting member 3.

Dans la forme d'exécution représentée au dessin, l'axe 18 de l'élément 19 est situé dans le prolongement de l'organe de levage 3, et l'élément 19 comprend une partie 20 en forme de crochet, destinée à venir s'engager à l'intérieur de l'oeil 5 de l'organe de levage 3. L'élément 19 est conformé de telle sorte que lorsque le crochet 20 est engagé à l'intérieur de l'oeil 5, comme tel est le cas aux figures 2 et 4, l'élément 19 soit entièrement escamoté à l'intérieur de la fente 17, l'un de ses bords affleurant avec la face plane 8 de l'élément 7. A proximité de l'une des extrémités de l'élément 19, est articulé autour d'un axe 22 parallèle à l'axe 18 de l'élément de verrouillage 19, un anneau 23, susceptible de pivoter entre une position escamotée, représentée aux figures 2 et 4, dans laquelle il ne dépasse pas de la face plane 8 de la pièce 7, et une position pivotée d'environ 90 degrés vers l'extérieur, dans laquelle il forme un organe d'actionnement de l'élément pivotant 19.In the embodiment shown in the drawing, the axis 18 of the element 19 is located in the extension of the lifting member 3, and the element 19 comprises a hook-shaped part 20, intended to come s 'engage inside the eye 5 of the lifting member 3. The element 19 is shaped so that when the hook 20 is engaged inside the eye 5, as is the case in Figures 2 and 4, the element 19 is fully retracted inside the slot 17, one of its edges flush with the flat face 8 of the element 7. Near one of the ends of the element 19 is articulated around an axis 22 parallel to the axis 18 of the locking element 19, a ring 23 capable of pivoting between a retracted position, shown in FIGS. 2 and 4, in which it does not exceed not of the flat face 8 of the part 7, and a position pivoted about 90 degrees outwards, in which it forms an action member swivel element 19.

Il doit être noté que l'élément 19 comporte également une partie profilée 24 en forme de rampe, disposée au-dessus du crochet 20, et qui, lors du pivotement de l'élément 19 de la position verrouillée vers la position déverrouillée, prend appui contre le bord supérieur de l'organe de levage 3, comme mieux montré à la figure 5, et tend à faire sortir la pièce 7 hors de la réservation 6 qu'elle vient de ménager dans le béton.It should be noted that the element 19 also comprises a profiled portion 24 in the form of a ramp, disposed above the hook 20, and which, when the element 19 is pivoted from the locked position to the unlocked position, is supported against the upper edge of the lifting member 3, as best shown in FIG. 5, and tends to cause the part 7 to come out of the reservation 6 which it has just formed in the concrete.

Le fonctionnement de ce dispositif est le suivant.The operation of this device is as follows.

Il est tout d'abord procédé au basculement de l'élément 19 vers sa position déverrouillée, avant introduction de l'organe de levage 3 à l'intérieur de la pièce 7. Après positionnement de l'extrémité 5 de l'organe 3 dans la pièce 7, l'élément 19 est basculé vers sa position de verrouillage, c'est-à-dire dans laquelle le crochet 20 est engagé dans l'oeil 5 de l'organe de levage 3. L'anneau 23 est escamoté dans l'évidement prévu pour le recevoir. L'ensemble est fixé contre la face métallique d'un coffrage 14, comme montré à la figure 4, après quoi il est procédé à la coulée du béton, et à la prise de celui-ci avant décoffrage. Lorsque le décoffrage a été effectué, il est procédé à un basculement d'environ 90 degrés de l'anneau 23 qui peut être saisi pour faire basculer l'élément 19 vers sa position de déverrouillage, comme montré à la figure 5, mouvement au cours duquel la rampe 24 prend appui contre l'extrémité de l'organe de levage, et favorise l'extraction de la pièce 7 hors de la réservation 6, qui est ménagée dans le béton. Il est alors possible d'accéder librement à l'oeil 5 de l'organe de levage, permettant ainsi de passer à l'intérieur de celui-ci, un dispositif de manutention adapté.The element 19 is first of all tilted towards its unlocked position, before introduction of the lifting member 3 inside the part 7. After positioning the end 5 of the member 3 in the part 7, the element 19 is tilted to its locking position, that is to say in which the hook 20 is engaged in the eye 5 of the lifting member 3. The ring 23 is retracted into the recess provided to receive it. The assembly is fixed against the metal face of a formwork 14, as shown in FIG. 4, after which the concrete is poured, and the setting of the latter before formwork is removed. When the formwork has been removed, the ring 23 is tilted by approximately 90 degrees which can be grasped to tilt the element 19 to its unlocked position, as shown in FIG. 5, movement during of which the ramp 24 bears against the end of the lifting member, and promotes the extraction of the part 7 from the reservation 6, which is made in concrete. It is then possible to freely access the eye 5 of the lifting member, thus making it possible to pass inside of it, a suitable handling device.

La figure 6 représente une variante d'exécution de ce dispositif, destinée au maintien provisoire d'un organe de levage constitué par une ancre à tête.FIG. 6 represents an alternative embodiment of this device, intended for the temporary maintenance of a lifting member constituted by a head anchor.

Dans ce dispositif, les mêmes éléments sont désignés par les mêmes références que précédemment.In this device, the same elements are designated by the same references as above.

Dans la pièce 7 est ménagé un évidement 26 de section circulaire, destiné au passage de l'extrémité supérieure de l'organe de levage qui comprend une tige cylindrique 27 équipée d'une tête élargie 28. L'évidement 26 est de section correspondant à celle de la tête élargie. L'extrémité inférieure de l'évidement 26 est séparée par un épaulement 29 d'une zone 30 de plus grande section, servant à la mise en place d'une bague fendue 32 qui entoure avec étanchéité la tige 27, et qui prend appui avec étanchéité dans la partie élargie 30 de l'évidement.In the part 7 is formed a recess 26 of circular section, intended for the passage of the upper end of the lifting member which comprises a cylindrical rod 27 equipped with an enlarged head 28. The recess 26 is of section corresponding to that of the enlarged head. The lower end of the recess 26 is separated by a shoulder 29 from an area 30 of larger section, used for the establishment of a split ring 32 which sealingly surrounds the rod 27, and which is supported with sealing in the enlarged part 30 of the recess.

En outre, l'élément de verrouillage 19 possède la même structure générale que celui décrit précédemment, et présente un organe de verrouillage constitué par une fourche 33 dont les deux branches sont destinées à passer de part et d'autre de la tige 27, sous la tête élargie 28.In addition, the locking element 19 has the same general structure as that described above, and has a locking member constituted by a fork 33, the two branches of which are intended to pass on either side of the rod 27, under enlarged head 28.

La mise en oeuvre de ce dispositif est identique à celle qui a été décrite précédemment dans le cas des ancres à oeil, sauf qu'il convient de procéder à la pose de la bague d'étanchéité 32 avant coulée du béton, et au retrait de cette bague, après enlèvement du système de maintien provisoire.The implementation of this device is identical to that which has been described previously in the case of eye anchors, except that it is necessary to install the sealing ring 32 before pouring the concrete, and to remove this ring, after removal of the provisional holding system.

Comme il ressort de ce qui précède, l'invention apporte une grande amélioration à la technique existante, en fournissant un dispositif pour le maintien provisoire d'un organe de levage sur une surface métallique de coffrage, qui possède une structure simple, d'une grande fiabilité, qui n'est pas détérioré au cours des utilisations successives, et quine détériore pas le coffrage sur lequel il est fixé.As is apparent from the above, the invention brings a great improvement to the existing technique, by providing a device for the temporary maintenance of a lifting member on a metal formwork surface, which has a simple structure, of a high reliability, which is not deteriorated during successive uses, and which does not deteriorate the formwork on which it is fixed.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de ce dispositif décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes de réalisation.It goes without saying that the invention is not limited to the sole embodiments of this device described above by way of examples, on the contrary it embraces all of the variant embodiments thereof.

Claims (9)

1.- Dispositif pour le maintien provisoire d'un organe de levage sur une surface métallique de coffrage pendant les phases de coulée et de prise du béton d'un élément en béton préfabriqué, caractérisé en ce qu'il comprend une pièce (7) présentant une face plane (8) qui, destinée à venir prendre appui contre la surface métallique (14) de coffrage, est équipée d'aimants (13), et se prolonge par une partie profilée destinée à ménager une réservation (6) dans l'élément en béton, cette pièce comportant d'une part, débouchant dans sa face opposée à la face plane et orthogonalement à celle-ci, un évidement (15, 26) destiné à permettre le passage avec étanchéité de l'organe de levage (2, 4, 27) et d'autre part, débouchant dans sa face plane, une fente (17) dans laquelle est monté pivotant autour d'un axe transversal à la fente, un élément (19) dont une partie (20) forme un verrou destiné à assurer, lorsque l'élément est en position escamotée dans la fente, la retenue de l'extrémité libre de l'organe de levage, des moyens étant prévus pour assurer l'actionnement de l'élément de verrouillage de sa position verrouillée à sa position déverrouillée. 1.- Device for temporarily holding a lifting member on a metallic formwork surface during the pouring and setting phases of the concrete of a precast concrete element, characterized in that it comprises a part (7) having a flat face (8) which, intended to come to bear against the metal surface (14) of formwork, is equipped with magnets (13), and is extended by a profiled part intended to provide a reservation (6) in the concrete element, this part comprising on the one hand, opening in its face opposite to the plane face and orthogonally to the latter, a recess (15, 26) intended to allow the passage with sealing of the lifting member ( 2, 4, 27) and on the other hand, opening into its flat face, a slot (17) in which is pivotally mounted about an axis transverse to the slot, an element (19) of which a part (20) forms a lock intended to ensure, when the element is in the retracted position in the a slot, the retention of the free end of the lifting member, means being provided for actuating the locking element from its locked position to its unlocked position. 2.- Dispositif selon la revendication 1, caractérisé en ce que la pièce (7) destinée à ménager la réservation est réalisée en une matière synthétique rigide et non cassante. 2.- Device according to claim 1, characterized in that the part (7) intended to spare the reservation is made of a rigid and non-brittle synthetic material. 3.- Dispositif selon la revendication 1, caractérisé en ce que la face plane (8) de la pièce (7) destinée à réaliser la réservation est délimitée par un épaulement (9) périphérique tourné du côté de la surface métallique du coffrage. 3.- Device according to claim 1, characterized in that the planar face (8) of the part (7) intended to carry out the reservation is delimited by a shoulder (9) peripheral turned on the side of the metal surface of the formwork. 4.- Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la pièce (7) destinée à réaliser la réservation possède une forme générale hémisphérique dont le fond, en forme de carêne, comporte une arête (10) délimitée par des surfaces (12) sensiblement planes. 4.- Device according to any one of claims 1 to 3, characterized in that the part (7) intended to carry out the reservation has a general hemispherical shape, the bottom, in the form of a hull, has an edge (10) defined by substantially flat surfaces (12). 5.- Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'axe d'articulation (18) de l'élément de verrouillage (19) est situé sensiblement à mi-longueur de la fente (17) destinée à la recevoir, sensiblement dans le prolongement de l'organe de levage (3), cet élément comportant une partie profilée formant rampe (24) qui, lors du pivotement de l'élément vers sa position de déverrouillage, est destinée à venir prendre appui contre le bord supérieur de l'organe de levage. 5.- Device according to any one of claims 1 to 4, characterized in that the axis of articulation (18) of the locking element (19) is located substantially mid-length of the slot (17) intended to receive it, substantially in the extension of the lifting member (3), this element comprising a profiled portion forming a ramp (24) which, when the element is pivoted towards its unlocking position, is intended to come and take support against the upper edge of the lifting member. 6.- Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les moyens destinés à assurer l'actionnement de l'élément de verrouillage (19) sont constitués par un anneau (23), monté articulé sur l'élément autour d'un axe (22) parallèle à l'axe d'articulation de celui-ci, à proximité de son extrémité destinée à faire saillie hors de la fente en position déverrouillée, cet anneau (23) étant escamotable le long de la face plane (8) de la pièce profilée lorsque celle-ci est fixée contre une surface métallique de coffrage. 6.- Device according to any one of claims 1 to 5, characterized in that the means intended to actuate the locking element (19) consist of a ring (23), mounted articulated on the element around an axis (22) parallel to the axis d articulation thereof, near its end intended to protrude from the slot in the unlocked position, this ring (23) being retractable along the flat face (8) of the profiled part when the latter is fixed against a metal formwork surface. 7.- Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les aimants (13) associés à la pièce (7) formant la réservation sont au moins au nombre de deux et sont disposés de façon symétrique par rapport à la zone de celle-ci destinée à recevoir l'organe de levage (3). 7.- Device according to any one of claims 1 to 6, characterized in that the magnets (13) associated with the part (7) forming the reservation are at least two in number and are arranged symmetrically with respect to the area thereof for receiving the lifting member (3). 8.- Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que dans le cas où l'organe de levage (3) est constitué par une ancre à oeil, c'est-à-dire un organe dont l'extrémité (4) est de section rectangulaire et comporte un trou transversal (5), l'élément de verrouillage comporte une partie (20) en forme de crochet destinée à pénétrer dans ce trou, l'évidement (15) ménagé dans la pièce profilée est de section rectangulaire correspondant à celle de l'extrémité de l'organe de levage, et son bord est délimité par un épaulement (16) destiné à prendre appui de façon étanche contre l'extrémité de l'organe de levage. 8.- Device according to any one of claims 1 to 7, characterized in that in the case where the lifting member (3) is constituted by an eye anchor, that is to say a member whose l end (4) is of rectangular section and has a transverse hole (5), the locking element comprises a part (20) in the form of a hook intended to enter this hole, the recess (15) formed in the part profiled is of rectangular section corresponding to that of the end of the lifting member, and its edge is delimited by a shoulder (16) intended to bear sealingly against the end of the lifting member. 9.- Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que dans le cas où l'organe de levage est constitué par une ancre à tête, c'est-à-dire dont l'extrémité est constituée par une tige cylindrique (27) équipée d'une tête élargie (28), l'élément de verrouillage comporte une partie (33) en forme de fourche destinée à venir coiffer la tige (27) et à prendre appui en-dessous de la tête (28) de l'organe de levage, l'évidement (26) ménagé dans la pièce profilée est de section circulaire adaptée à la section de la tête élargie, et une bague (32) fendue entourant la tige (27) de l'ancre est destinée à assurer l'étanchéité entre là tige et le fond de la pièce profilée (7). 9.- Device according to any one of claims 1 to 7, characterized in that in the case where the lifting member is constituted by a head anchor, that is to say whose end is constituted by a cylindrical rod (27) equipped with an enlarged head (28), the locking element comprises a part (33) in the form of a fork intended to come to cover the rod (27) and to bear under the head (28) of the lifting member, the recess (26) formed in the profiled part is of circular section adapted to the section of the enlarged head, and a split ring (32) surrounding the rod (27) of the anchor is intended to seal between the rod and the bottom of the profiled part (7).
EP92420027A 1991-02-08 1992-01-23 Arrangement for provisionally supporting a lifting element on a metallic forming surface during pouring and hardening of a prefabricated concrete element Withdrawn EP0498742A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9101916A FR2672648B1 (en) 1991-02-08 1991-02-08 PROVISIONAL HOLDING DEVICE FOR A LIFTING MEMBER ON A METAL FORMWORK SURFACE DURING CONCRETE AND TAKING CONCRETE PHASES OF A PREFABRICATED CONCRETE ELEMENT.
FR9101916 1991-02-08

Publications (1)

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EP0498742A1 true EP0498742A1 (en) 1992-08-12

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EP92420027A Withdrawn EP0498742A1 (en) 1991-02-08 1992-01-23 Arrangement for provisionally supporting a lifting element on a metallic forming surface during pouring and hardening of a prefabricated concrete element

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US (1) US5155954A (en)
EP (1) EP0498742A1 (en)
JP (1) JPH071433A (en)
CA (1) CA2060841A1 (en)
FR (1) FR2672648B1 (en)

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EP0627286A1 (en) * 1993-05-10 1994-12-07 Conac Limited Methods and apparatus for use in forming recesses in cast bodies
AU669433B2 (en) * 1993-05-10 1996-06-06 Halfen Gmbh Methods and apparatus for use in forming recesses in cast bodies
US5535979A (en) * 1993-05-10 1996-07-16 Conac Limited Apparatus for use in forming recesses in cast bodies

Also Published As

Publication number Publication date
FR2672648A1 (en) 1992-08-14
FR2672648B1 (en) 1993-04-16
US5155954A (en) 1992-10-20
JPH071433A (en) 1995-01-06
CA2060841A1 (en) 1992-08-09

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