EP0263024B1 - Device for removing and handling concrete articles cast in fixed moulds - Google Patents

Device for removing and handling concrete articles cast in fixed moulds Download PDF

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Publication number
EP0263024B1
EP0263024B1 EP19870402160 EP87402160A EP0263024B1 EP 0263024 B1 EP0263024 B1 EP 0263024B1 EP 19870402160 EP19870402160 EP 19870402160 EP 87402160 A EP87402160 A EP 87402160A EP 0263024 B1 EP0263024 B1 EP 0263024B1
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EP
European Patent Office
Prior art keywords
product
lifting device
elements
lifting
mold
Prior art date
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EP19870402160
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German (de)
French (fr)
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EP0263024A2 (en
EP0263024A3 (en
Inventor
Jean-Pierre Costamagna
Jean-Louis Feuillade
Paul Savard-Chambard
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RECTOR S.A.
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RECTOR SA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
    • B28B23/024—Supporting means
    • B28B23/026—Mould partitionning elements acting as supporting means in moulds, e.g. for elongated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/04—Discharging the shaped articles
    • B28B13/06—Removing the shaped articles from moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/26—Assemblies of separate moulds, i.e. of moulds or moulding space units, each forming a complete mould or moulding space unit independently from each other
    • B28B7/266—Assemblies of separate moulds, i.e. of moulds or moulding space units, each forming a complete mould or moulding space unit independently from each other for making oblong objects, e.g. girders

Definitions

  • a fixed mold is a mold whose sides do not move apart.
  • the fixed mold technique is used in particular in the production of prestressed concrete products by adhesive wires, on a large bench, that is to say on benches 80 to 100 meters long. In these benches, the products can be long - in this case the mold is single or "unitary" and occupies the entire length of the bench - or short, of the order of ten meters, and then the molds are placed in one after the other and are crossed by the same bundle of prestressing wires.
  • the molds are arranged in batteries or modules.
  • Each module comprises, in a chassis, a plurality of identical molds, arranged parallel to each other others, and the modules are aligned between the ends of the bench.
  • each module there are combs defining the horizontal and vertical positions of the prestressing steels.
  • the products are demolded using a gantry moving longitudinally on the prestressing bench, this gantry lifting the concrete products horizontally using the combs indicated above.
  • ejectors mounted under the molds are used and their action allows automatic demolding of the reinforced or prestressed concrete elements, followed by formwork removal and handling by vacuum collection of products with suction cups. The product can then be cut into at least two pieces as required.
  • the object of the present invention is to avoid jamming during the demolding of the product, and to make it possible to manufacture a product in several elements in a single mold, the elements being demouldable simultaneously in a single operation.
  • the subject of the invention is a device for releasing an elongated product of reinforced or prestressed concrete poured into a mold with fixed walls, on a prestressing bench comprising at least one hydraulic release cylinder placed under the mold, and a hydraulic lifting suction cup. mounted on a lifting and handling device, characterized in that it comprises two horizontal stop bars, integral with the handling device, arranged above the product at each of its ends, transversely to said product, fixed in height by relative to the prestressing bench, at a height determined by the product, in order to limit the stroke of the jack in height and therefore to limit the displacement in height of the product and to control the release.
  • Figure 1 a schematic perspective view of the device according to the invention
  • Figure 2 a schematic profile view of the device according to the invention before demolding
  • Figure 3 a schematic profile view of the device according to the invention in the demolding and handling phase
  • Figure 4 a detail view of a first alternative embodiment of a separator element according to the invention
  • Figure 5 a detail view of a second alternative embodiment of a separator element according to the invention.
  • Figure 1 shows schematically a prestressing bench 1. It is a large bench, that is to say ranging from 80 to at least 100 meters long. This bench comprises at least one fixed mold 2, that is to say the sides of which are immobile.
  • the example illustrated presents a bench made up of several modules 3 one after the other, each comprising a plurality of molds 2 fixed, parallel, side by side.
  • the demolding device is positioned above a module 3 and is ready to demold the products contained in this module.
  • each mold 2 has openings 9 for passage of a jack 10.
  • a jack at each end; one can also use only one jack and distribute the force so as to obtain a balanced force over the length of the product 16; it is also possible to use a large number of cylinders all connected to the same hydraulic compressor.
  • the function of the jacks is to unmold and eject the product out of the mold upwards.
  • at least two suction cups 11, or other known vacuum system are placed on the product and lift it upwards.
  • suction cups are connected to a handling device 12 of the gantry type on wheels; and when the suction cups are sufficiently raised, taking the product 16 with them, the gantry can be moved to take the product to an annexed work area.
  • two horizontal bars 13 are provided, integral with the handling device 12, arranged near each end 14, 15 of the product 16, transversely to said product.
  • the handling device is fixed in height relative to the bench 1. For example, it can rest on the chassis of the prestressing bench or on the ground on which the bench is located.
  • each bar 13 is wedged in height, relative to the bench 1, at the distance D from the bench.
  • the bars are stationary and, when under the action of the jacks 10, the product rises in the mold, it meets and abuts on the bars 13.
  • the distance D is provided so as to avoid jamming 17 of the product, jamming which occurs when the inclination ⁇ with respect to the horizontal is too large, in particular when one end is ejected and the another is still in the mold.
  • the setting height D is determined according to the shape of the products, but it may also be necessary to provide variations of this height depending on the progress of the release, in particular as a function of the thickness of the product.
  • the bars have a setting height determined by the progression in height of the products.
  • the bars are connected to the handling device 12 by rigid telescopic rods 18, controlled by an operator or a computer not shown, which makes it possible to make the height D adjustable at will, the bar 13 being able during the same demolding operation be set at increasing heights D, D ⁇ , D ⁇
  • the product can be removed from the mold by successive progressions, each progression corresponding to a limit inclination of jamming, the total progression corresponding to the height of complete demolding.
  • the product After demolding, handling and depositing on a storage area, the product can be cut into sections to obtain several elements of concrete products.
  • the product in the fixed mold is divided longitudinally into at least two elements 20, 21 of prestressed concrete. These elements 20, 21 are aligned with each other and separated by a separating member 22 closely interposed between said elements.
  • each element 20, 21 is removed from the mold and ejected simultaneously by at least one jack 10, all the jacks being connected to the same hydraulic compressor P.
  • the separating member 22 consists of a single perforated part, FIG. 4.
  • This part comprises two vertical walls 26, 27, provided with grooves 28 for passage of the prestressing wires 30, and connected by a plate horizontal 29, located so as to allow access to the wires for cutting them after demolding.
  • the separating member consists of three parts, two lateral 31, 32 and a central 33.
  • the central part 33 engages in a V formed by the union of the two lateral parts 31, 32 as as shown in Figure 5.
  • the identical side pieces are the end walls of the concrete elements.
  • the central part is held between the lateral parts and can be removed to give access to the prestressing steels.
  • the three parts have openings for the passage of steel wires.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Description

La technologie de fabrication des produits allongés en béton armé ou précontraint a considérablement évoluée ces dernières années, et plus particulièrement les techniques de démoulage, pour obtenir des produits réguliers, des cadences de fabrication élevées et des prix de revient les plus bas possible.The technology for manufacturing elongated reinforced or prestressed concrete products has evolved considerably in recent years, and more particularly the release techniques, to obtain regular products, high production rates and the lowest possible cost prices.

Ainsi des moules longitudinaux ouvrants ont été réalisés ; ils sont décrits dans le brevet FR-A-243660 déposé le 20 septembre 1978 par la demanderesse : et sont composés de deux flancs longitudinaux qui peuvent être écartés lors du démoulage et rapprochés pour fermer les moules.Thus opening longitudinal molds have been produced; they are described in patent FR-A-243660 filed on September 20, 1978 by the plaintiff: and are composed of two longitudinal sides which can be moved apart during demolding and brought together to close the molds.

Cependant, cette technique reste encore assez sophistiquée et coûteuse et l'emploi de moules fixes reste encore fréquent. Par opposition aux moules ouvrants précédents un moule fixe est un moule dont les flancs ne s'écartent pas. La technique des moules fixes est notamment utilisée dans la production de produits en béton précontraint par fils adhérents, sur grand banc, c'est-à-dire sur des bancs de 80 à 100 mètres de long. Dans ces bancs, les produits peuvent être longs -dans ce cas le moule est unique ou "unitaire" et occupe toute la longueur du banc- ou courts, de l'ordre d'une dizaine de mètres, et alors les moules sont placés en série les uns à la suite des autres et sont traversés par le même faisceau de fils de précontrainte.However, this technique is still quite sophisticated and expensive and the use of fixed molds is still frequent. In contrast to the preceding opening molds, a fixed mold is a mold whose sides do not move apart. The fixed mold technique is used in particular in the production of prestressed concrete products by adhesive wires, on a large bench, that is to say on benches 80 to 100 meters long. In these benches, the products can be long - in this case the mold is single or "unitary" and occupies the entire length of the bench - or short, of the order of ten meters, and then the molds are placed in one after the other and are crossed by the same bundle of prestressing wires.

Dans la technique des produits courts en moules courts, on dispose les moules en batteries ou modules. Chaque module comporte, dans un châssis, un pluralité de moules identiques, disposés parallèlement les uns des autres, et les modules sont alignés entre les extrémités du banc.In the technique of short products in short molds, the molds are arranged in batteries or modules. Each module comprises, in a chassis, a plurality of identical molds, arranged parallel to each other others, and the modules are aligned between the ends of the bench.

Le procédé de démoulage et d'enlèvement de ces produits est décrit dans le brevet FR-A-2254946 déposé le 17 décembre 1973 par la demanderesse.The demolding and removal process for these products is described in patent FR-A-2254946 filed on December 17, 1973 by the applicant.

A l'extrémité de chaque module, on dispose des peignes définissant les positions horizontalement et verticalement des aciers de précontrainte. Lorsque la prise complète du béton a eu lieu, on démoule les produits à l'aide d'un portique se déplaçant longitudinalement sur le banc de précontrainte, ce portique soulevant les produits béton horizontalement à l'aide des peignes indiqués ci-dessus.At the end of each module, there are combs defining the horizontal and vertical positions of the prestressing steels. When the complete setting of the concrete has taken place, the products are demolded using a gantry moving longitudinally on the prestressing bench, this gantry lifting the concrete products horizontally using the combs indicated above.

Ce système de démoulage n'est possible :

  • que pour des produits courts et non flexibles;
  • que pour des produits avec un nombre important d'acier de précontrainte pénétrant dans les peignes d'extrémités ;
  • que pour les produits ne présentant pas de gros efforts lors du démoulage.
This demolding system is only possible:
  • only for short and non-flexible products;
  • only for products with a large number of prestressing steel entering the end combs;
  • only for products that do not present large forces during demolding.

Pour éviter le risque de blocage au démoulage des produits long dans des moules fixes, on utilise des éjecteurs montés sous les moules et leur action permet un démoulage automatique des éléments en béton armé ou précontraint, suivi d'un décoffrage et d'une manutention par prise sous vide des produits avec des ventouses. Le produit peut ensuite être coupé en au moins deux éléments selon les besoins.To avoid the risk of blocking the demoulding of long products in fixed molds, ejectors mounted under the molds are used and their action allows automatic demolding of the reinforced or prestressed concrete elements, followed by formwork removal and handling by vacuum collection of products with suction cups. The product can then be cut into at least two pieces as required.

Cependant, la sortie des produits n'est jamais simultanée aux deux extrémités compte tenu des forces de frottement variables le long du moule, et cela peut conduire à des coincements des produits dans le moule.However, the output of the products is never simultaneous at both ends, given the forces variable friction along the mold, and this can lead to product jams in the mold.

La présente invention a pour objectif d'éviter le coincement lors du démoulage du produit, et de permettre de fabriquer un produit en plusieurs éléments dans un seul moule, les éléments étant démoulables simultanément en une seule opération.The object of the present invention is to avoid jamming during the demolding of the product, and to make it possible to manufacture a product in several elements in a single mold, the elements being demouldable simultaneously in a single operation.

L'invention a pour objet un dispositif de démoulage de produit allongé en béton armé ou précontraint coulé dans un moule à parois fixes, sur un banc de précontrainte comportant au moins un vérin hydraulique de démoulage disposé sous le moule, et une ventouse hydraulique de levage montée sur un appareil de levage et manutention, caractérisé en ce qu'il comporte deux barres de butée horizontales, solidaires de l'appareil de manutention, disposées au-dessus du produit à chacune de ses extrémités, transversalement audit produit, calée en hauteur par rapport au banc de précontrainte, à une hauteur déterminée par le produit, afin de limiter la course du vérin en hauteur et par conséquent de limiter le déplacement en hauteur du produit et de contrôler le démoulage.The subject of the invention is a device for releasing an elongated product of reinforced or prestressed concrete poured into a mold with fixed walls, on a prestressing bench comprising at least one hydraulic release cylinder placed under the mold, and a hydraulic lifting suction cup. mounted on a lifting and handling device, characterized in that it comprises two horizontal stop bars, integral with the handling device, arranged above the product at each of its ends, transversely to said product, fixed in height by relative to the prestressing bench, at a height determined by the product, in order to limit the stroke of the jack in height and therefore to limit the displacement in height of the product and to control the release.

L'invention est encore remarquable par les caractéristiques suivantes :

  • la hauteur de calage des barres est variable et déterminée par la progression du démoulage ;
  • le produit est unique dans le moule et occupe toute sa longueur ;
  • le produit est précontraint et comporte, dans un même moule, au moins deux éléments de produit alignés l'un avec l'autre, un organe séparateur étroitement intercalé entre les deux éléments, de sorte que les éléments forment un ensemble monolithique ;
  • l'organe séparateur comporte au moins une pièce ajourée avec des rainures de passage des fils d'acier de précontrainte ;
  • l'organe séparateur comporte en variante trois pièces alignées . Chaque pièce comporte des rainures de passage des fils d'acier. La pièce centrale a une forme venant s'engager entre les deux autres pièces formant un V entre elles, et peut être dégagée du V pour donner l'accès aux fils. Les deux pièces d'extrémité sont en contact avec et forme les parois des extrémités des éléments en béton.
The invention is also remarkable for the following characteristics:
  • the setting height of the bars is variable and determined by the progress of demolding;
  • the product is unique in the mold and occupies its entire length;
  • the product is prestressed and comprises, in the same mold, at least two product elements aligned with each other, a separating member closely interposed between the two elements, so that the elements form a monolithic unit;
  • the separating member comprises at least one perforated part with grooves for the passage of the prestressed steel wires;
  • the separator member alternatively comprises three aligned parts. Each piece has grooves for the passage of steel wires. The central part has a shape which engages between the two other parts forming a V between them, and can be released from the V to give access to the wires. The two end pieces are in contact with and form the walls of the ends of the concrete elements.

A titre d'exemple de réalisation et pour mieux comprendre l'invention, on a représenté au dessin annexé :
Figure 1 : une vue schématique en perspective du dispositif selon l'invention ;
Figure 2 : une vue schématique de profil du dispositif selon l'invention avant démoulage ;
Figure 3 : une vue schématique de profil du dispositif selon l'invention en phase de démoulage et manutention;
Figure 4 : une vue de détail d'une première variante de réalisation d'un élément séparateur selon l'invention ;
Figure 5 : une vue de détail d'une seconde variante de réalisation d'un élément séparateur selon l'invention.By way of exemplary embodiment and to better understand the invention, the following drawing shows:
Figure 1: a schematic perspective view of the device according to the invention;
Figure 2: a schematic profile view of the device according to the invention before demolding;
Figure 3: a schematic profile view of the device according to the invention in the demolding and handling phase;
Figure 4: a detail view of a first alternative embodiment of a separator element according to the invention;
Figure 5: a detail view of a second alternative embodiment of a separator element according to the invention.

La description qui suit repose sur un exemple de réalisation de produit précontraint, mais l'invention n'est pas limitée aux bétons précontraints, ni aux bétons armés. Tous les produits allongés en béton moulé peuvent être démoulés avec ce dispositif.The following description is based on an exemplary embodiment of a prestressed product, but the invention is not limited to prestressed concrete, or to reinforced concrete. All elongated molded concrete products can be removed from the mold with this device.

Seuls les produits en plusieurs éléments par moule doivent être précontraints.Only products made up of several elements per mold must be prestressed.

La figure 1 montre schématiquement un banc de précontrainte 1. Il s'agit d'un grand banc, c'est-à-dire allant de 8O à 100 mètres de long au moins. Ce banc comporte au moins un moule 2 fixe, c'est-à-dire dont les flancs sont immobiles. L'exemple illustré présente un banc composé de plusieurs modules 3 les uns à la suite des autres, comportant chacun une pluralité de moules 2 fixes, parallèles, côte à côte. Le dispositif de démoulage est positionné au dessus d'un module 3 et est prêt à effectuer le démoulage des produits contenus dans ce module.Figure 1 shows schematically a prestressing bench 1. It is a large bench, that is to say ranging from 80 to at least 100 meters long. This bench comprises at least one fixed mold 2, that is to say the sides of which are immobile. The example illustrated presents a bench made up of several modules 3 one after the other, each comprising a plurality of molds 2 fixed, parallel, side by side. The demolding device is positioned above a module 3 and is ready to demold the products contained in this module.

Sur les figures 2 et 3, on voit les extrémités 5 et 6 du banc de précontrainte ainsi que les extrémités 7 et 8 des câbles de précontrainte.In Figures 2 and 3, we see the ends 5 and 6 of the prestressing bench and the ends 7 and 8 of the prestressing cables.

Le fond de chaque moule 2 comporte des ouvertures 9, de passage d'un vérin 10.The bottom of each mold 2 has openings 9 for passage of a jack 10.

Ces vérins sont reliés à un compresseur unique P. Ainsi la pression dans chaque vérin est la même.These cylinders are connected to a single compressor P. Thus the pressure in each cylinder is the same.

Dans l'exemple de réalisation, on a représenté un vérin à chaque extrémité ; on peut aussi n'utiliser qu'un vérin et répartir l'effort de façon à obtenir un effort équilibré sur la longueur du produit 16 ; on peut aussi utiliser un grand nombre de vérins tous reliés au même compresseur hydraulique.In the exemplary embodiment, there is shown a jack at each end; one can also use only one jack and distribute the force so as to obtain a balanced force over the length of the product 16; it is also possible to use a large number of cylinders all connected to the same hydraulic compressor.

Les vérins ont pour fonction de démouler et éjecter le produit hors du moule vers le haut. Lorsque le produit 16 est dégagé de son moule, au moins deux ventouses 11, ou autre système de prise sous vide connu, sont placées sur le produit et le soulèvent vers le haut.The function of the jacks is to unmold and eject the product out of the mold upwards. When the product 16 is released from its mold, at least two suction cups 11, or other known vacuum system, are placed on the product and lift it upwards.

Ces ventouses sont reliées à un dispositif de manutention 12 du type portique sur roues ; et lorsque les ventouses sont suffisamment relevées, emportant avec elles le produit 16, le portique peut être déplacé pour emmener le produit sur une aire de travail annexe.These suction cups are connected to a handling device 12 of the gantry type on wheels; and when the suction cups are sufficiently raised, taking the product 16 with them, the gantry can be moved to take the product to an annexed work area.

Selon l'invention, on prévoit deux barres 13, horizontales, solidaires de l'appareil de manutention 12, disposées à proximité de chaque extrémité 14, 15 du produit 16, transversalement audit produit.According to the invention, two horizontal bars 13 are provided, integral with the handling device 12, arranged near each end 14, 15 of the product 16, transversely to said product.

L'appareil de manutention est fixe en hauteur relativement au banc 1. Par exemple, il peut reposer sur le châssis du banc de précontrainte ou sur le sol sur lequel est situé le banc.The handling device is fixed in height relative to the bench 1. For example, it can rest on the chassis of the prestressing bench or on the ground on which the bench is located.

Il est alors possible de déterminer avec précision une distance D relative entre chaque barre 13 et un point quelconque du banc de précontrainte, par exemple le fond du moule.It is then possible to precisely determine a relative distance D between each bar 13 and any point on the prestressing bench, for example the bottom of the mold.

Dans l'exemple de réalisation de l'invention, chaque barre 13 est calée en hauteur, par rapport au banc 1, à la distance D du banc. Ainsi les barres sont immobiles et, lorsque sous l'action des vérins 10, le produit s'élève dans le moule, il rencontre et bute sur les barres 13.In the exemplary embodiment of the invention, each bar 13 is wedged in height, relative to the bench 1, at the distance D from the bench. Thus the bars are stationary and, when under the action of the jacks 10, the product rises in the mold, it meets and abuts on the bars 13.

En général, des frottements sur les flancs du moule empêchent le produit 16 de sortir du moule horizontalement : il monte plus vite d'un côté que de l'autre.In general, friction on the sides of the mold prevents the product 16 from leaving the mold horizontally: it rises faster on one side than on the other.

Lorsqu'une première extrémité 14 atteint la barre 13, elle est immobilisée en hauteur, et le second vérin, agissant encore, rattrape le retard jusqu'à ce que l'extrémité 15 vienne buter sur la barre 13ʹ.When a first end 14 reaches the bar 13, it is immobilized in height, and the second jack, still acting, catches up with the delay until the end 15 comes up against the bar 13ʹ.

La distance D, ou hauteur de calage, est prévue de manière à éviter les coincements 17 du produit, coincements qui interviennent lorsque l'inclinaison α par rapport à l'horizontale est trop grande, en particulier lorsqu'une extrémité est éjectée et l'autre est encore dans le moule.The distance D, or setting height, is provided so as to avoid jamming 17 of the product, jamming which occurs when the inclination α with respect to the horizontal is too large, in particular when one end is ejected and the another is still in the mold.

La hauteur D de calage est déterminée selon la forme des produits, mais il peut aussi être nécessaire de prévoir des variations de cette hauteur selon la progression du démoulage, en particulier en fonction de l'épaisseur du produit.The setting height D is determined according to the shape of the products, but it may also be necessary to provide variations of this height depending on the progress of the release, in particular as a function of the thickness of the product.

Dans ce but, les barres ont une hauteur de calage déterminée par la progression en hauteur des produits.For this purpose, the bars have a setting height determined by the progression in height of the products.

Les barres sont reliées à l'appareil de manutention 12 par des tiges 18 rigides télescopiques, commandées par un opérateur ou un calculateur non représenté, ce qui permet de rendre la hauteur D ajustable à volonté, la barre 13 pouvant au cours d'une même opération de démoulage être calée à des hauteurs D, Dʹ, Dʺ successives croissantesThe bars are connected to the handling device 12 by rigid telescopic rods 18, controlled by an operator or a computer not shown, which makes it possible to make the height D adjustable at will, the bar 13 being able during the same demolding operation be set at increasing heights D, Dʹ, Dʺ

Ainsi, le produit peut être démoulé par progressions successives, chaque progression correspondant à une inclinaison limite de coincement, la progression totale correspondant à la hauteur de démoulage complet.Thus, the product can be removed from the mold by successive progressions, each progression corresponding to a limit inclination of jamming, the total progression corresponding to the height of complete demolding.

Après le démoulage, la manutention et le dépôt sur une aire de stockage, le produit peut être coupé en tronçons pour obtenir plusieurs éléments de produits en béton.After demolding, handling and depositing on a storage area, the product can be cut into sections to obtain several elements of concrete products.

Selon une variante de réalisation (figures 2 et 3), le produit dans le moule fixe est divisé longitudinalement en au moins deux éléments 20, 21 en béton précontraint. Ces éléments 20, 21 sont alignés l'un avec l'autre et séparés par un organe séparateur 22 étroitement intercalé entre lesdits éléments.According to an alternative embodiment (Figures 2 and 3), the product in the fixed mold is divided longitudinally into at least two elements 20, 21 of prestressed concrete. These elements 20, 21 are aligned with each other and separated by a separating member 22 closely interposed between said elements.

Cet organe séparateur 22 a plusieurs fonctions:

  • 1) C'est une paroi 23 d'extrémité et d'étanchéité de chaque élément en béton ; en effet le moule de chaque élément comprenant obligatoirement quatre parois, il est nécessaire de prévoir des parois à chaque extrémité et en particulier aux extrémités situées dans le moule, où on intercale un organe séparateur 22. L'organe séparateur comporte précisément cette paroi.
  • 2) C'est un organe séparateur en ce sens qu'il établit une cloison transversale dans le moule unitaire 2, le séparant en deux parties distinctes 24, 25.
  • 3) C'est un organe de liaison assurant le maintien monolithique du produit moulé entier : le produit en béton est précontraint et les parois 23 de l'organe étant en contact avec le béton (fonction de paroi d'extrémité), lors du relâchement de la tension aux fils d'extrémités du moule, les fils dans l'organe séparateur se rétractent . La force de précontrainte comprime alors l'organe 22, et cette compression sur l'organe assure une liaison rigide des éléments 20, 21 avec l'organe. Le produit, constitué des éléments 20, 21 et de l'organe 22, est donc un produit rigide précontraint, monolithique pouvant être démoulé et manutentionné comme un produit d'un seul tenant en béton.
This separating member 22 has several functions:
  • 1) It is a wall 23 at the end and sealing of each concrete element; in fact the mold of each element necessarily comprising four walls, it is necessary to provide walls at each end and in particular at the ends situated in the mold, where a separating member 22 is inserted. The separating member precisely comprises this wall.
  • 2) It is a separating member in the sense that it establishes a transverse partition in the unitary mold 2, separating it into two distinct parts 24, 25.
  • 3) It is a connecting member ensuring the monolithic maintenance of the entire molded product: the concrete product is prestressed and the walls 23 of the member being in contact with the concrete (end wall function), upon release of the tension at the ends of the mold, the wires in the separating member retract. The prestressing force then compresses the member 22, and this compression on the member ensures a rigid connection of the elements 20, 21 with the member. The product, made up of elements 20, 21 and of member 22, is therefore a rigid, pre-stressed, monolithic product which can be removed from the mold and handled as a product in one piece made of concrete.

Dans cette variante de réalisation d'un produit en plusieurs éléments séparés, chaque élément 20, 21 est démoulé et éjecté simultanément par au moins un vérin 10, tous les vérins étant reliés au même compresseur hydraulique P.In this variant embodiment of a product made up of several separate elements, each element 20, 21 is removed from the mold and ejected simultaneously by at least one jack 10, all the jacks being connected to the same hydraulic compressor P.

Selon une variante de réalisation, l'organe séparateur 22 est constitué d'une seule pièce ajourée, figure 4. Cette pièce comporte deux parois verticales 26, 27, munies de rainures 28 de passage des fils 30 de précontrainte, et reliées par une plaque horizontale 29, située de façon à permettre l'accès des fils pour leur coupure après démoulage.According to an alternative embodiment, the separating member 22 consists of a single perforated part, FIG. 4. This part comprises two vertical walls 26, 27, provided with grooves 28 for passage of the prestressing wires 30, and connected by a plate horizontal 29, located so as to allow access to the wires for cutting them after demolding.

Selon une autre variante de réalisation, l'organe séparateur est constitué de trois pièces, deux latérales 31, 32 et une centrale 33. La pièce centrale 33 vient s'engager dans un V formé par la réunion des deux pièces latérales 31, 32 comme le montre la figure 5. Les pièces latérales, identiques, sont des parois d'extrémité des éléments en béton. La pièce centrale est maintenue entre les pièces latérales et peut être enlevée pour donner l'accès aux aciers 30 de précontrainte.According to another alternative embodiment, the separating member consists of three parts, two lateral 31, 32 and a central 33. The central part 33 engages in a V formed by the union of the two lateral parts 31, 32 as as shown in Figure 5. The identical side pieces are the end walls of the concrete elements. The central part is held between the lateral parts and can be removed to give access to the prestressing steels.

Les trois pièces comportent des ouvertures de passage des fils d'acier.The three parts have openings for the passage of steel wires.

Les avantages de ce dispositif de démoulage sont nombreux et importants :

  • a) Les coincements lors du démoulage, dus aux déplacements irréguliers du produit, sont évités d'où un gain de temps considérable.
  • b) La qualité du produit est améliorée car chaque intervention en cas de coincement détériore plus ou moins la surface du produit.
  • c) Les produits peuvent être préalablement divisés en éléments de longueurs prédéterminées. Il n'est plus nécessaire de les scier en tronçons, il suffit alors de couper les câbles passant dans les organes séparateurs, d'où une économie
    • . de temps d'intervention : il est plus rapide de couper quelques câbles que de tronçonner une poutre,
    • . de coût : il n'y a plus de tronçonneuse,
    • . et de qualité du produit : les parois d'extrémités donnent l'aspect souhaité des extrémités d'éléments sans autre intervention.
The advantages of this mold release device are numerous and important:
  • a) The jams during demolding, due to the irregular movements of the product, are avoided where a considerable time saving.
  • b) The quality of the product is improved because each intervention in the event of jamming more or less deteriorates the surface of the product.
  • c) The products can be previously divided into elements of predetermined lengths. It is no longer necessary to saw them into sections, it suffices to cut the cables passing through the separating members, hence saving
    • . intervention time: it is faster to cut a few cables than to cut a beam,
    • . cost: there is no longer a chainsaw,
    • . and product quality: the end walls give the desired appearance of the ends of the elements without further intervention.

Claims (7)

  1. A lifting device for an elongated product of armoured or prestressed concrete in a fixed mould comprising at least a hydraulic jack arranged under the mould, and a hydraulic lifting sucker mounted onto a lifting and handling apparatus, characterized in that it comprises two horizontal bars (13) integrated with the lifting apparatus and arranged above the product (16) to extend transversely to the product, the bars being locked with regard to the prestressing bed (1), at a level (D) determined by the product, in order to limit the height stroke of the jack (10).
  2. A lifting device as claimed in Claim 1, characterized in that it comprises a prestressed product (16) with at least two aligned elements (20, 21), a separating means (22) tightly inserted between the two elements so that the elements (20, 21) and the separating means (22) form a monolithic unit, and at least one hydraulic jack (10) disposed under each element (20, 21).
  3. A lifting device as claimed in Claim 2, characterized in that the separating means (22) comprises at least an open element having slots (28) for the passing through of the steel wires.
  4. A lifting device as claimed in Claim 2, characterized in that each separating means comprises three pieces (31, 32, 33), each piece comprising slots for the passing through of the steel wires (30), the central piece (33) having a form as to cooperate with the two other complementary pieces (31, 32) forming a V between them, it being possible to remove the central piece to have access to the steel wires, the two pieces being in contact with the ends of the elements.
  5. A lifting device as claimed in Claim 1, characterized in that the locking level (D) of the bars is adjustable at any level, it being possible to adjust the bar (13), during one and the same lifting operation, to be locked at different increasing levels.
  6. A lifting device as claimed in Claim 1, characterized in that it comprises a jack (10) at each end (14, 15) of the product, the jacks being supplied by one and the same pressure source P.
  7. A lifting device as claimed in Claim 2, characterized in that the jacks (10) are supplied by one and the same pressure source P.
EP19870402160 1986-10-01 1987-09-28 Device for removing and handling concrete articles cast in fixed moulds Expired - Lifetime EP0263024B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613683 1986-10-01
FR8613683A FR2604944B1 (en) 1986-10-01 1986-10-01 IMPROVED DEVICE FOR RELEASING AND HANDLING CONCRETE PRODUCTS MOLDED IN FIXED MOLDS

Publications (3)

Publication Number Publication Date
EP0263024A2 EP0263024A2 (en) 1988-04-06
EP0263024A3 EP0263024A3 (en) 1989-10-18
EP0263024B1 true EP0263024B1 (en) 1991-04-24

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EP19870402160 Expired - Lifetime EP0263024B1 (en) 1986-10-01 1987-09-28 Device for removing and handling concrete articles cast in fixed moulds

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EP (1) EP0263024B1 (en)
FR (1) FR2604944B1 (en)

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CN108660929A (en) * 2018-04-26 2018-10-16 李福� Based on the bridge construction small-sized plane form removable device for preventing concrete damaged surfaces

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Publication number Priority date Publication date Assignee Title
ES2116819B1 (en) * 1994-01-11 1999-03-16 Alvistranvi S A MANUFACTURING PROCEDURE FOR MULTIPURPOSE CROSSINGS.
ES2217948B2 (en) * 2002-12-09 2005-11-16 Jose Antonio Martin Arcadio ESCAYOLA PLATE DISMOLDER INSTALLATION.
BE1020140A3 (en) * 2011-03-31 2013-05-07 Bonte International Bv Met Beperkte Aansprakelijkheid De CASTING MOLD FOR CASTING A CONCRETE ELEMENT, METHOD THEREOF APPLIED AND PRODUCTION LINE FITTED OUT THEREFORE.
CN106965301B (en) * 2017-04-18 2022-08-30 苏州久力砼业机械有限公司 Rapid mold opening and closing die for precast concrete beam column component and manufacturing method
CN112829052B (en) * 2021-01-20 2022-09-20 万绍豪 Be used for production cement board drawing of patterns equipment
CN113172754A (en) * 2021-04-22 2021-07-27 中电建十一局工程有限公司 Method for manufacturing prefabricated pedestal of pipe gallery

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FR745023A (en) * 1933-05-01
GB708062A (en) * 1950-11-13 1954-04-28 Nat Res Dev Improvements in or relating to the production of concrete members
GB1249294A (en) * 1967-09-05 1971-10-13 Nat Res Dev Improvements in and relating to suction pads
FR2263357A1 (en) * 1974-03-04 1975-10-03 Toulpac Sa Void forming elements for concrete - is foam with cavity and notches for reinforcing bars
FR2434693A2 (en) * 1977-03-28 1980-03-28 Costamagna & Cie B M Prestressing bed for precast concrete beams - has mould with fixed slotted end forms and pistons to assist striking
FR2458368A1 (en) * 1979-06-13 1981-01-02 Freyssinet Int Stup METHOD AND DEVICE FOR DEMOLISHING PRECONTRATED CONCRETE ELEMENTS MOLDED ON A LONG BENCH

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108660929A (en) * 2018-04-26 2018-10-16 李福� Based on the bridge construction small-sized plane form removable device for preventing concrete damaged surfaces

Also Published As

Publication number Publication date
FR2604944A1 (en) 1988-04-15
EP0263024A2 (en) 1988-04-06
FR2604944B1 (en) 1990-08-10
EP0263024A3 (en) 1989-10-18

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