EP2671698B1 - Bench for manufacturing girders by extrusion - Google Patents

Bench for manufacturing girders by extrusion Download PDF

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Publication number
EP2671698B1
EP2671698B1 EP13170491.8A EP13170491A EP2671698B1 EP 2671698 B1 EP2671698 B1 EP 2671698B1 EP 13170491 A EP13170491 A EP 13170491A EP 2671698 B1 EP2671698 B1 EP 2671698B1
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EP
European Patent Office
Prior art keywords
retaining
longitudinal members
grid
teeth
deck
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EP13170491.8A
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German (de)
French (fr)
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EP2671698A1 (en
Inventor
Christophe Pacqueau
Frédéric Claverie
Jean Claude Legall
Thierry Haour
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KP1 SAS
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KP1 SAS
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Priority to PL13170491T priority Critical patent/PL2671698T3/en
Publication of EP2671698A1 publication Critical patent/EP2671698A1/en
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    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/084—Producing shaped prefabricated articles from the material by vibrating or jolting the vibrating moulds or cores being moved horizontally for making strands of moulded 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
    • B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
    • 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
    • B28B23/06—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 for the production of 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/24—Unitary mould structures with a plurality of moulding spaces, e.g. moulds divided into multiple moulding spaces by integratable partitions, mould part structures providing a number of moulding spaces in mutual co-operation

Definitions

  • the invention relates to a bench for manufacturing girders by spinning, of the type known from the patent document FR241040 , that is to say comprising a rectangular decking of great length carrying a moving element moved at regular intervals along the decking to pour the concrete beams in successive series.
  • the mobile equipment comprises a grid resting on the decking, this grid being formed of a series of longitudinal members parallel to the longitudinal direction of the decking, laterally spaced from each other and rigidly secured to each other by a front cross member and a rear cross member located in the upper face of this grid.
  • the concrete is poured on the grid resting motionless on the decking, to form a series of beams, that is to say a beam in each space transversely separating two longitudinal members.
  • the moving equipment is then moved longitudinally before casting another series of beams spaced from the previous along the decking.
  • These manufactured beams are prestressed, that is to say that they integrate strained longitudinal metal wires or cables.
  • Each prestressing wire is stretched over the decking, and extends along the main direction of the decking being located between two longitudinal members of the grid.
  • several prestressing wires may extend between each pair of contiguous spars, being for example located one above the other.
  • the front end of the grid is equipped with a concrete retaining comb and guiding the prestressing wires to optimize their lateral and vertical positioning.
  • This mobile comb has a series of teeth interposed between the longitudinal members, and it is movable longitudinally with respect to the grid.
  • Each tooth of the comb has a section corresponding to the space between the two longitudinal members between which it is interposed, that is to say a shape corresponding to the section of beam to be manufactured, so as to retain the concrete.
  • Each tooth of this comb further comprises holes through which pre-stressing son to maintain these son in position.
  • each tooth is first engaged on the wire or son it must guide, before powering these son above the decking.
  • the grid is then applied to the decking, before engaging each tooth between the two longitudinal members that correspond to it.
  • a support beam is attached to the upper part of the teeth to be rigidly secured to these teeth so as to form the movable comb along the grid body.
  • the grid further comprises at its rear end a movable flap between a low concrete retaining position and a high release position.
  • a movable flap between a low concrete retaining position and a high release position.
  • the concrete When the grid is in place on the decking, with its mobile comb at its front end and its rear door in the low position, the concrete is poured into the spaces between each pair of contiguous spars, along the entire length of the grid. Additionally, it can be expected to vibrate this concrete and smooth its upper face to improve the quality of manufacture.
  • an operator blocks the mobile comb in translation relative to the decking, by means of appropriate equipment, and raises the rear door.
  • the grid can then be moved forward along the decking: the mobile comb relative to the grid being blocked in translation relative to the decking, it holds the concrete beams in place, while the rest of the grid with its Spars is moved forward.
  • An installation for manufacturing of prestressed concrete beams by spinning as defined in the preamble of claim 1 is already known from FR 2 152 604 A1 .
  • the object of the invention is to propose a solution to remedy this drawback.
  • the subject of the invention is an installation for the manufacture of prestressed concrete beams. by spinning according to claim 1.
  • the guide teeth being fixed relative to the longitudinal members of the grid, they provide guidance and therefore precise positioning of the prestressing wires, which makes it possible to reduce the rate of rejection due to the beams too strongly curved at the from their manufacture.
  • the invention also relates to an installation as defined above, further comprising means for locking the immovable holding comb in translation relative to the decking.
  • each concrete retaining tooth comprises a plurality of points for its vertical insertion straddling one or more prestressing cables.
  • the invention also relates to an installation as defined above, wherein the retaining comb is vertically movable relative to the longitudinal members between a low position in which the retaining teeth are inserted between the longitudinal members and a raised position in which the teeth restraint are released from the side members.
  • the idea underlying the invention lies in the finding that the teeth of the known machine insufficiently guide the prestressing cables because they have significant lateral play made necessary by their longitudinal mobility relative to the rest of the wire rack.
  • the invention is based on the separation between the yarn guiding function and the retaining function of the concrete: there is provided a fixed yarn guide comb and a movable concrete stopping comb which are separate for separately guiding the yarns and the retention of concrete.
  • the grid of the installation according to the invention which is represented in figure 1 1, comprises a set of longitudinal members 2 extending parallel to a longitudinal direction AX being spaced from each other laterally, that is to say transversely this direction AX.
  • These rails 2 are secured to each other by means of two cross members 3 and 4 respectively located at the front and rear of the assembly formed by the longitudinal members 2 being located on the upper face of these longitudinal members.
  • the assembly constituted by the longitudinal members 2 and the crosspieces 3 and 4 by which they are secured to each other constitutes a grid body, indicated by 6.
  • the longitudinal members 2 and the crosspieces 3 and 4 are metal sections of rectangular section, T, I, or other, and they are joined to each other by welding to the crosspieces 3 and 4.
  • the grid 1 is part of an unrepresented moving assembly, which is carried by a not shown deck, rectangular in shape and having a length much greater than the length of the grid 1.
  • the decking and the moving equipment are provided with means with which the moving element moves rectilinearly along the decking.
  • These guide means comprise for example two parallel side rails along the edges of the deck, the movable assembly being provided with corresponding wheels by which it rolls on these rails.
  • the mobile equipment typically carries means for pouring concrete on the grid 1 and means for vibrating the concrete once poured, so that it fills correctly by thixotropic effect each space between two longitudinal members.
  • the installation further comprises, at each end of the decking, means for setting in position of prestressing wires and mechanical stressing of these stress wires which are marked by 7 in the figure 1 .
  • These son extend parallel to each other above the flat upper face and metal decking, being laterally spaced from each other by a distance corresponding to the distance separating each pair of contiguous spars 2.
  • each prestressing wire 7 passes between two longitudinal members 2 of this grid, to be coated by the constituent concrete of the beam manufactured between the two longitudinal members in question.
  • the gate body 6 is equipped on the one hand with a concrete retaining comb 8 which is movable in translation relative to the gate body 6 in the longitudinal direction AX, and on the other hand a fixed comb 9 for guiding the prestressing wires which is rigidly secured to the gate body 6 when the gate 1 is in use.
  • the mobile concrete retaining comb 8 comprises a series of retaining teeth 11, one of which is shown in greater detail in the figure 2 . As visible in this figure, this tooth 11 has two points or branches 12 and 13, intended to overlap a prestressing wire extending on either side of it while fitting into the space delimited by two contiguous spars 2.
  • the points 12 and 13 of each tooth 11 is spaced from each other by a distance significantly greater than the diameter of the prestressing wires 2, so as not to modify the lateral or vertical position of the prestressing wires.
  • the width of the assembly constituted by the two points is substantially less than the distance separating two longitudinal members 2 contigus so as to provide sufficient lateral clearance to allow unhindered sliding of the mobile comb 8 along the side members.
  • each tooth 11 relatively imperfectly close the section in which they are engaged, delimited by the two longitudinal members 2 between which is engaged the tooth 11, but this relatively imperfect closure remains sufficient to retain the concrete in place when it bears on these teeth 11.
  • the different double teeth 11 of the mobile comb 8 are carried by a main cross member 14 to which they are welded by their respective upper ends, this upper cross member resting on the upper face of the longitudinal members 2.
  • the main cross member 14 is oriented transversely and extends laterally beyond the gate body 6. This cross member 14 is provided at its free ends with means not shown for its immobilization relative to the deck, to pull the gate body 6 along the decking by sliding it in the immobilized comb 8, which corresponds to the situation of the figure 1 .
  • This movable retaining comb 8 can advantageously be raised and lowered at will with respect to the grid body 6, which allows it to be reassembled to remove the residual concrete remained attached to its teeth in order to effectively clean this mobile comb 8 in progress. exploitation.
  • the comb 9 for guiding the prestressing wires which is fixed with respect to the gate body 6 when the installation is in use, comprises a series of guide teeth 16 each inserted between two contiguous longitudinal members 2. As visible in FIG. figure 3 , this fixed guide comb 9 also comprises a cross member 17, which is welded to the upper face of the gate body 6, and serving to secure each tooth 16 to the gate body.
  • the cross member 17 has at one of its transverse edges a notch at each interval separating two side members 2 contiguous. Each notch extends longitudinally in the direction AX, and each tooth 16 has its body engaged between the two longitudinal members 2, and its upper head recessed or nested in the corresponding notch of the crosspiece 17. This embedding can optionally be achieved by force with a mass.
  • Additional locking means of each tooth 16, not shown, may also be provided.
  • a removable additional crossbar can be reported, after embedding all the teeth 16, along the edge of the cross member 17 which has the notches, which then allows to completely imprison each tooth head 16 to rigidly secure to the grid body.
  • Each tooth 16 may for example be made of plastic material, being dimensioned to close the section separating two side members 2 contiguous with the lowest possible clearance. As visible in the figure 3 each tooth 16 has one or more through holes 18 passing through the tooth in the longitudinal direction AX when the assembly is in use.
  • Each through hole 18 has a diameter very close to the diameter of the prestressing wires 2: the vertical and lateral position of the wires in the section of the beam is thus defined by the position of the through holes 18 of the guide teeth 16.
  • each guide tooth 16 can bear on the side faces of the longitudinal members 2 between which it is inserted.
  • a wedge system placed between the lateral surface of the tooth 16 and the lateral surface of the spar 2 can also be provided to laterally position the tooth 16 very precisely in the lateral direction.
  • the positioning teeth 16 are engaged on the prestressing wires 7 during the installation of these prestressing wires on the decking.
  • the moving equipment is then installed on the decking, after which the positioning teeth 16 are engaged in their slots and notches at the grid 1, and they are locked in these locations.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Description

L'invention concerne un banc de fabrication de poutrelles par filage, du type connu du document de brevet FR241040 , c'est-à-dire comprenant un platelage rectangulaire de grande longueur portant un équipage mobile déplacé à intervalles réguliers le long de ce platelage pour couler le béton des poutrelles par séries successives.The invention relates to a bench for manufacturing girders by spinning, of the type known from the patent document FR241040 , that is to say comprising a rectangular decking of great length carrying a moving element moved at regular intervals along the decking to pour the concrete beams in successive series.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

Dans une telle installation, l'équipage mobile comporte une grille reposant sur le platelage, cette grille étant formée d'une série de longerons parallèles à la direction longitudinale du platelage, espacés latéralement les uns des autres et rigidement solidarisés les uns aux autres par une traverse avant et une traverse arrière situées en face supérieure de cette grille.In such an installation, the mobile equipment comprises a grid resting on the decking, this grid being formed of a series of longitudinal members parallel to the longitudinal direction of the decking, laterally spaced from each other and rigidly secured to each other by a front cross member and a rear cross member located in the upper face of this grid.

En fonctionnement, le béton est coulé sur la grille reposant immobile sur le platelage, pour former une série de poutrelles, c'est-à-dire une poutrelle dans chaque espace séparant transversalement deux longerons. L'équipage mobile est ensuite déplacé longitudinalement avant de procéder au coulage d'une autre série de poutrelles espacée de la précédente le long du platelage.In operation, the concrete is poured on the grid resting motionless on the decking, to form a series of beams, that is to say a beam in each space transversely separating two longitudinal members. The moving equipment is then moved longitudinally before casting another series of beams spaced from the previous along the decking.

Ces poutrelles fabriquées sont précontraintes, c'est-à-dire qu'elles intègrent des fils ou câbles métalliques longitudinaux tendus. Chaque fil de précontrainte est tendu au dessus du platelage, et s'étend selon la direction principale de ce platelage en étant situé entre deux longerons de la grille. En pratique plusieurs fils de précontrainte peuvent s'étendre entre chaque paire de longerons contigus, en étant par exemple situés les uns au dessus des autres.These manufactured beams are prestressed, that is to say that they integrate strained longitudinal metal wires or cables. Each prestressing wire is stretched over the decking, and extends along the main direction of the decking being located between two longitudinal members of the grid. In practice, several prestressing wires may extend between each pair of contiguous spars, being for example located one above the other.

L'extrémité avant de la grille est équipée d'un peigne de retenue du béton et de guidage des fils de précontrainte pour optimiser leur positionnement latéral et vertical. Ce peigne mobile comporte une série de dents intercalées entre les longerons, et il est déplaçable longitudinalement par rapport à la grille.The front end of the grid is equipped with a concrete retaining comb and guiding the prestressing wires to optimize their lateral and vertical positioning. This mobile comb has a series of teeth interposed between the longitudinal members, and it is movable longitudinally with respect to the grid.

Chaque dent du peigne présente une section correspondant à l'espace séparant les deux longerons entre lesquels elle est intercalée, c'est-à-dire une forme correspondant à la section de poutrelle à fabriquer, de manière à retenir le béton. Chaque dent de ce peigne comporte en outre des trous traversés par des fils de précontrainte pour maintenir ces fils en position.Each tooth of the comb has a section corresponding to the space between the two longitudinal members between which it is interposed, that is to say a shape corresponding to the section of beam to be manufactured, so as to retain the concrete. Each tooth of this comb further comprises holes through which pre-stressing son to maintain these son in position.

Lors de la préparation d'une campagne de fabrication de poutrelles par filage, chaque dent est d'abord engagée sur le ou les fils qu'elle doit guider, avant mise sous tension de ces fils au dessus du platelage. La grille est ensuite appliquée sur le platelage, avant d'engager chaque dent entre les deux longerons qui lui correspondent. Une fois que toutes les dents sont en place au même niveau le long de la grille, une poutre support est rapportée en partie supérieure des dents pour être solidarisée rigidement à ces dents de façon à constituer le peigne mobile le long du corps de grille.During the preparation of a spinning joists manufacturing campaign, each tooth is first engaged on the wire or son it must guide, before powering these son above the decking. The grid is then applied to the decking, before engaging each tooth between the two longitudinal members that correspond to it. Once all the teeth are in place at the same level along the grid, a support beam is attached to the upper part of the teeth to be rigidly secured to these teeth so as to form the movable comb along the grid body.

La grille comporte encore à son extrémité arrière un volet mobile entre une position basse de retenue du béton et une position haute de libération. Lorsque le volet est en position basse les dents qu'il comporte à son bord inférieur sont insérées entre les fils et les longerons pour retenir le béton, et lorsque ce volet est relevé, l'espace situé entre les fils et les longerons est laissé libre.The grid further comprises at its rear end a movable flap between a low concrete retaining position and a high release position. When the flap is in the low position the teeth it has at its lower edge are inserted between the son and the longitudinal members to retain the concrete, and when the flap is raised, the space between the son and the side members is left free .

Lorsque la grille est en place sur le platelage, avec son peigne mobile à son extrémité avant et son volet arrière en position basse, le béton est coulé dans les espaces situés entre chaque paire de longerons contigus, sur toute la longueur de la grille. Additionnellement, il peut être prévu de vibrer ce béton et de lisse sa face supérieur pour améliorer la qualité de fabrication.When the grid is in place on the decking, with its mobile comb at its front end and its rear door in the low position, the concrete is poured into the spaces between each pair of contiguous spars, along the entire length of the grid. Additionally, it can be expected to vibrate this concrete and smooth its upper face to improve the quality of manufacture.

A ce stade, un opérateur bloque le peigne mobile en translation par rapport au platelage, au moyen d'un équipement approprié, et il relève le volet arrière. La grille peut alors être déplacée vers l'avant le long du platelage : le peigne mobile par rapport à la grille étant bloqué en translation par rapport au platelage, il retient en place le béton des poutrelles, pendant que le reste de la grille avec ses longerons est déplacé vers l'avant.At this stage, an operator blocks the mobile comb in translation relative to the decking, by means of appropriate equipment, and raises the rear door. The grid can then be moved forward along the decking: the mobile comb relative to the grid being blocked in translation relative to the decking, it holds the concrete beams in place, while the rest of the grid with its Spars is moved forward.

Lorsque la grille a été suffisamment avancée, elle est à nouveau immobilisée sur le platelage, en vue de la fabrication d'une autre série de poutrelles. Le peigne mobile qui est situé en partie arrière de la grille est alors débloqué par rapport au platelage, et ramené à l'avant de la grille, et le volet arrière de la grille est abaissé. On peut alors procéder au coulage du béton d'une nouvelle série de poutrelles espacées de la première série.When the grid has been sufficiently advanced, it is again immobilized on the decking, for the manufacture of another series of beams. The movable comb which is located in the rear part of the grid is then released relative to the decking, and brought to the front of the grid, and the rear gate of the grid is lowered. It is then possible to pour the concrete from a new series of beams spaced from the first series.

En pratique, le calage latéral des fils de précontrainte n'est pas satisfaisant, ce qui peut conduire à produire des poutrelles courbées qui ne sont pas acceptables. En effet, lorsque les câbles de précontraintes sont mal centrés par rapport à la section de la poutrelle, ils mettent la poutrelle en flexion. Il s'ensuit qu'une quantité trop importante de poutrelles doit être mise au rebut à l'issue de chaque campagne de production.In practice, the lateral setting of the prestressing wires is not satisfactory, which can lead to producing curved beams that are not acceptable. Indeed, when the prestressing cables are poorly centered relative to the section of the beam, they put the beam in bending. As a result, too many beams must be discarded at the end of each production season.

Une installation de fabrication de poutrelles en béton précontraint par filage telle que définie dans le préambule de la revendication 1 est déjà connue de FR 2 152 604 A1 .An installation for manufacturing of prestressed concrete beams by spinning as defined in the preamble of claim 1 is already known from FR 2 152 604 A1 .

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Le but de l'invention est de proposer une solution pour remédier à cet inconvénient.The object of the invention is to propose a solution to remedy this drawback.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

A cet effet, l'invention a pour objet une installation de fabrication de poutrelles en béton précontraint par filage suivant la revendication 1.For this purpose, the subject of the invention is an installation for the manufacture of prestressed concrete beams. by spinning according to claim 1.

Selon l'invention, les dents de guidage étant fixes par rapport aux longerons de la grille, elles assurent un guidage et donc un positionnement précis des fils de précontrainte, qui permet de réduire le taux de rebut dû aux poutrelles trop fortement courbées à l'issue de leur fabrication.According to the invention, the guide teeth being fixed relative to the longitudinal members of the grid, they provide guidance and therefore precise positioning of the prestressing wires, which makes it possible to reduce the rate of rejection due to the beams too strongly curved at the from their manufacture.

L'invention concerne également une installation telle que définie ci-dessus, comprenant en outre des moyens pour bloquer le peigne de retenue immobile en translation par rapport au platelage.The invention also relates to an installation as defined above, further comprising means for locking the immovable holding comb in translation relative to the decking.

L'invention concerne également une installation telle que définie ci-dessus, dans laquelle chaque dent de retenue du béton comporte plusieurs pointes permettant son insertion verticale à cheval sur un ou plusieurs câbles de précontrainte.The invention also relates to an installation as defined above, wherein each concrete retaining tooth comprises a plurality of points for its vertical insertion straddling one or more prestressing cables.

L'invention concerne également une installation telle que définie ci-dessus, dans laquelle le peigne de retenue est mobile verticalement par rapport aux longerons entre une position basse dans laquelle les dents de retenue sont insérées entre les longerons et une position relevée dans laquelle les dents de retenue sont dégagées des longerons.The invention also relates to an installation as defined above, wherein the retaining comb is vertically movable relative to the longitudinal members between a low position in which the retaining teeth are inserted between the longitudinal members and a raised position in which the teeth restraint are released from the side members.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

  • La figure 1 est une représentation schématique montrant en vue de dessus la grille de l'installation selon l'invention ;The figure 1 is a schematic representation showing in plan view the grid of the installation according to the invention;
  • La figure 2 est une représentation schématique montrant une dent du peigne mobile de retenue du béton équipant la grille de l'installation selon l'invention ;The figure 2 is a schematic representation showing a tooth of the movable retaining comb of the concrete equipping the grid of the installation according to the invention;
  • La figure 3 est une représentation schématique montrant les dents du peigne fixe de guidage des câbles de précontrainte équipant la grille de l'installation selon l'invention.The figure 3 is a schematic representation showing the teeth of the fixed guide comb of the prestressing cables equipping the grid of the installation according to the invention.
DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

L'idée à la base de l'invention réside dans le constat selon lequel les dents de la machine connue guident insuffisamment les câbles de précontrainte du fait qu'elles ont un jeu latéral important rendu nécessaire par leur mobilité longitudinale par rapport au reste de la grille.The idea underlying the invention lies in the finding that the teeth of the known machine insufficiently guide the prestressing cables because they have significant lateral play made necessary by their longitudinal mobility relative to the rest of the wire rack.

L'invention repose sur la séparation entre la fonction de guidage des fils et celle de retenue du béton : on prévoit un peigne fixe de guidage des fils et un peigne mobile d'arrêt du béton qui sont distincts pour assurer séparément le guidage des fils et la retenue du béton.The invention is based on the separation between the yarn guiding function and the retaining function of the concrete: there is provided a fixed yarn guide comb and a movable concrete stopping comb which are separate for separately guiding the yarns and the retention of concrete.

La grille de l'installation selon l'invention, qui est représentée en figure 1 en y étant repérée par 1, comprend un ensemble de longerons 2 s'étendant parallèlement à une direction longitudinale AX en étant espacés les uns des autres latéralement, c'est-à-dire transversalement cette direction AX.The grid of the installation according to the invention, which is represented in figure 1 1, comprises a set of longitudinal members 2 extending parallel to a longitudinal direction AX being spaced from each other laterally, that is to say transversely this direction AX.

Ces longerons 2 sont solidarisés les uns aux autres au moyen de deux traverses 3 et 4 situées respectivement à l'avant et à l'arrière de l'ensemble formé par les longerons 2 en étant situés en face supérieure de ces longerons. L'ensemble constitué par les longerons 2 et les traverses 3 et 4 par lesquelles ils sont solidarisés les uns aux autres constitue un corps de grille, repéré par 6.These rails 2 are secured to each other by means of two cross members 3 and 4 respectively located at the front and rear of the assembly formed by the longitudinal members 2 being located on the upper face of these longitudinal members. The assembly constituted by the longitudinal members 2 and the crosspieces 3 and 4 by which they are secured to each other constitutes a grid body, indicated by 6.

Les longerons 2 et les traverses 3 et 4 sont des profilés métalliques à section rectangulaire, en T, en I, ou autre, et ils sont solidarisés les uns aux autres par soudage aux traverses 3 et 4.The longitudinal members 2 and the crosspieces 3 and 4 are metal sections of rectangular section, T, I, or other, and they are joined to each other by welding to the crosspieces 3 and 4.

La grille 1 fait partie d'un équipage mobile non représenté, qui est porté par un platelage non représenté, de forme rectangulaire et ayant une longueur très supérieure à la longueur de la grille 1. Le platelage et l'équipage mobile sont pourvus de moyens de guidage grâce auxquels l'équipage mobile se déplace de manière rectiligne le long du platelage.The grid 1 is part of an unrepresented moving assembly, which is carried by a not shown deck, rectangular in shape and having a length much greater than the length of the grid 1. The decking and the moving equipment are provided with means with which the moving element moves rectilinearly along the decking.

Ces moyens de guidage comportent par exemple deux rails latéraux parallèles longeant les bords du platelage, l'équipage mobile étant quant à lui pourvu de roues correspondantes grâce auxquelles il roule sur ces rails.These guide means comprise for example two parallel side rails along the edges of the deck, the movable assembly being provided with corresponding wheels by which it rolls on these rails.

L'équipage mobile porte typiquement des moyens pour couler du béton sur la grille 1 ainsi que des moyens pour vibrer ce béton une fois coulé, afin qu'il comble correctement par effet thixotropique chaque espace entre deux longerons.The mobile equipment typically carries means for pouring concrete on the grid 1 and means for vibrating the concrete once poured, so that it fills correctly by thixotropic effect each space between two longitudinal members.

L'installation comporte encore, à chaque extrémité du platelage, des moyens de mise en position de fils de précontrainte et de mise sous tension mécanique de ces fils de contrainte qui sont repérés par 7 dans la figure 1. Ces fils s'étendent parallèlement les uns aux autres au dessus de la face supérieure plane et métallique du platelage, en étant espacés latéralement les uns des autres d'une distance correspondant à la distance séparant chaque paire de longerons 2 contigus.The installation further comprises, at each end of the decking, means for setting in position of prestressing wires and mechanical stressing of these stress wires which are marked by 7 in the figure 1 . These son extend parallel to each other above the flat upper face and metal decking, being laterally spaced from each other by a distance corresponding to the distance separating each pair of contiguous spars 2.

Comme illustré à la figure 1, lorsque la grille 1 est en place, en appui sur le platelage, chaque fil de précontrainte 7 passe entre deux longerons 2 de cette grille, pour être enrobé par le béton constitutif de la poutrelle fabriquée entre les deux longerons en question.As illustrated in figure 1 when the grid 1 is in place, resting on the decking, each prestressing wire 7 passes between two longitudinal members 2 of this grid, to be coated by the constituent concrete of the beam manufactured between the two longitudinal members in question.

Selon l'invention, le corps de grille 6 est équipé d'une part d'un peigne de retenue du béton 8 qui est mobile en translation par rapport au corps de grille 6 selon la direction longitudinale AX, et d'autre part d'un peigne fixe 9 de guidage des fils de précontrainte qui est rigidement solidaire du corps de grille 6 lorsque la grille 1 est en service.According to the invention, the gate body 6 is equipped on the one hand with a concrete retaining comb 8 which is movable in translation relative to the gate body 6 in the longitudinal direction AX, and on the other hand a fixed comb 9 for guiding the prestressing wires which is rigidly secured to the gate body 6 when the gate 1 is in use.

Le peigne mobile 8 de retenue du béton comporte une série de dents de retenue 11 dont une est représentée de façon plus détaillée dans la figure 2. Comme visible dans cette figure, cette dent 11 comporte deux pointes ou ramifications 12 et 13, destinées à chevaucher un fil de précontrainte en s'étendant de part et d'autre de celui-ci tout en s'insérant dans l'espace délimité par deux longerons contigus 2.The mobile concrete retaining comb 8 comprises a series of retaining teeth 11, one of which is shown in greater detail in the figure 2 . As visible in this figure, this tooth 11 has two points or branches 12 and 13, intended to overlap a prestressing wire extending on either side of it while fitting into the space delimited by two contiguous spars 2.

D'une manière générale, les pointes 12 et 13 de chaque dent 11 sont espacées l'une de l'autre d'une distance significativement supérieure au diamètre des fils de précontrainte 2, de manière à ne pas modifier la position latérale ni verticale des fils de précontrainte. La largeur de l'ensemble constitué par les deux pointes est sensiblement inférieure à la distance séparant deux longerons 2 contigus de manière à offrir un jeu latéral suffisant pour permettre un coulissement sans entraves du peigne mobile 8 le long des longerons.In a general way, the points 12 and 13 of each tooth 11 is spaced from each other by a distance significantly greater than the diameter of the prestressing wires 2, so as not to modify the lateral or vertical position of the prestressing wires. The width of the assembly constituted by the two points is substantially less than the distance separating two longitudinal members 2 contigus so as to provide sufficient lateral clearance to allow unhindered sliding of the mobile comb 8 along the side members.

Ainsi, les deux pointes 12 et 13 de chaque dent 11 obturent de façon relativement imparfaite la section dans laquelle elles sont engagées, délimitée par les deux longerons 2 entre lesquelles est engagée la dent 11, mais cette obturation relativement imparfaite reste suffisante pour retenir le béton en place lorsqu'il est en appui sur ces dents 11.Thus, the two points 12 and 13 of each tooth 11 relatively imperfectly close the section in which they are engaged, delimited by the two longitudinal members 2 between which is engaged the tooth 11, but this relatively imperfect closure remains sufficient to retain the concrete in place when it bears on these teeth 11.

Les différentes dents doubles 11 du peigne mobile 8 sont portées par une traverse principale 14 à laquelle elles sont soudées par leurs extrémités supérieures respectives, cette traverse supérieure reposant sur la face supérieure des longerons 2.The different double teeth 11 of the mobile comb 8 are carried by a main cross member 14 to which they are welded by their respective upper ends, this upper cross member resting on the upper face of the longitudinal members 2.

La traverse principale 14 est orientée transversalement, et elle s'étend latéralement au delà du corps de grille 6. Cette traverse 14 est pourvue à ses extrémités libres de moyens non représentés permettant son immobilisation par rapport au platelage, pour tirer le corps de grille 6 le long du platelage en le faisant coulisser dans le peigne 8 immobilisé, ce qui correspond à la situation de la figure 1.The main cross member 14 is oriented transversely and extends laterally beyond the gate body 6. This cross member 14 is provided at its free ends with means not shown for its immobilization relative to the deck, to pull the gate body 6 along the decking by sliding it in the immobilized comb 8, which corresponds to the situation of the figure 1 .

Ce peigne de retenue mobile 8 peut avantageusement être relevé et descendu à volonté par rapport au corps de grille 6, ce qui permet de le remonter pour retirer le béton résiduel resté attaché à ses dents afin de nettoyer efficacement ce peigne mobile 8 en cours d'exploitation.This movable retaining comb 8 can advantageously be raised and lowered at will with respect to the grid body 6, which allows it to be reassembled to remove the residual concrete remained attached to its teeth in order to effectively clean this mobile comb 8 in progress. exploitation.

Le peigne 9 de guidage des fils de précontrainte, qui est fixe par rapport au corps de grille 6 lorsque l'installation est en service, comporte une série de dents de guidage 16 insérées chacune entre deux longerons contigus 2. Comme visible dans la figure 3, ce peigne fixe de guidage 9 comporte également une traverse 17, qui est soudée à la face supérieure du corps de grille 6, et servant à solidariser chaque dent 16 au corps de grille.The comb 9 for guiding the prestressing wires, which is fixed with respect to the gate body 6 when the installation is in use, comprises a series of guide teeth 16 each inserted between two contiguous longitudinal members 2. As visible in FIG. figure 3 , this fixed guide comb 9 also comprises a cross member 17, which is welded to the upper face of the gate body 6, and serving to secure each tooth 16 to the gate body.

Concrètement, et comme visible à la figure 3, la traverse 17 comporte à l'un de ses bords transversaux une encoche au niveau de chaque intervalle séparant deux longerons 2 contigus. Chaque encoche s'étend longitudinalement selon la direction AX, et chaque dent 16 a son corps engagé entre les deux longerons 2, et sa tête supérieure encastrée ou emboîtée dans l'encoche correspondante de la traverse 17. Cet encastrement peut éventuellement être réalisé en force avec une masse.Concretely, and as visible to the figure 3 , the cross member 17 has at one of its transverse edges a notch at each interval separating two side members 2 contiguous. Each notch extends longitudinally in the direction AX, and each tooth 16 has its body engaged between the two longitudinal members 2, and its upper head recessed or nested in the corresponding notch of the crosspiece 17. This embedding can optionally be achieved by force with a mass.

Des moyens additionnels de blocage de chaque dent 16, non représentés, peuvent également être prévus. A ce titre, une traverse additionnelle amovible peut être rapportée, après encastrement de toutes les dents 16, le long du bord de la traverse 17 qui comporte les encoches, ce qui permet alors d'emprisonner complètement chaque tête de dent 16 pour la solidariser rigidement au corps de grille.Additional locking means of each tooth 16, not shown, may also be provided. As such, a removable additional crossbar can be reported, after embedding all the teeth 16, along the edge of the cross member 17 which has the notches, which then allows to completely imprison each tooth head 16 to rigidly secure to the grid body.

Chaque dent 16 peut par exemple être fabriquée en matière plastique, en étant dimensionnée pour obturer la section séparant deux longerons 2 contigus avec un jeu le plus faible possible. Comme visible dans la figure 3, chaque dent 16 comporte un ou plusieurs trous traversants 18 traversant cette dent selon la direction longitudinale AX lorsque l'ensemble est en service.Each tooth 16 may for example be made of plastic material, being dimensioned to close the section separating two side members 2 contiguous with the lowest possible clearance. As visible in the figure 3 each tooth 16 has one or more through holes 18 passing through the tooth in the longitudinal direction AX when the assembly is in use.

Chaque trou traversant 18 a un diamètre très proche du diamètre des fils de précontrainte 2 : la position verticale et latérale des fils dans la section de la poutrelle est ainsi définie par la position des trous traversants 18 des dents de guidage 16.Each through hole 18 has a diameter very close to the diameter of the prestressing wires 2: the vertical and lateral position of the wires in the section of the beam is thus defined by the position of the through holes 18 of the guide teeth 16.

Complémentairement, chaque dent de guidage 16 peut prendre appui sur les faces latérales des longerons 2 entre lesquels elle est insérée. A cette fin, un système de cales placées entre la surface latérale de la dent 16 et la surface latérale du longeron 2 peut aussi être prévu pour positionner latéralement la dent 16 de façon très précise selon la direction latérale.Complementarily, each guide tooth 16 can bear on the side faces of the longitudinal members 2 between which it is inserted. To this end, a wedge system placed between the lateral surface of the tooth 16 and the lateral surface of the spar 2 can also be provided to laterally position the tooth 16 very precisely in the lateral direction.

En pratique les dents de positionnement 16 sont engagées sur les fils de précontrainte 7 lors de l'installation de ces fils de précontrainte sur le platelage. L'équipage mobile est ensuite installé sur le platelage, après quoi les dents de positionnement 16 sont engagées dans leurs logements et encoches au niveau de la grille 1, et elles sont bloquées dans ces emplacements.In practice, the positioning teeth 16 are engaged on the prestressing wires 7 during the installation of these prestressing wires on the decking. The moving equipment is then installed on the decking, after which the positioning teeth 16 are engaged in their slots and notches at the grid 1, and they are locked in these locations.

Claims (4)

  1. Installation for manufacturing prestressed concrete beams by extrusion, comprising:
    - a fixed rectangular metal deck extending horizontally and oriented in a longitudinal direction (AX);
    - a mobile assembly supported by the deck and comprising a grid (1) including a series of longitudinal structural sections (2) spaced from one another laterally and rigidly fastened to one another;
    - means for guiding the mobile assembly along the deck;
    - means for retaining a set of prestressing cables (7) extending longitudinally over the deck, each cable (7) being intended to be placed between two longitudinal members (2) of the grid (1);
    for manufacturing series of beams by pouring concrete for each series into the spaces laterally separating the longitudinal members (2) of the grid (1) immobilised on the deck before moving this grid (1) along the deck to pour a new series of beams, until the entire length of the deck has been travelled, characterised in that this installation includes at its front end:
    - on the one hand, guith teeth (16) for guiding the cables (7), each inserted between two contiguous longitudinal members (2), these guide teeth (16) being rigidly fastened to the grid (1) and not being in contact with the concrete at any time when the installation is in service;
    - on the other hand, retaining teeth (11) for retaining the concrete, each inserted between two contiguous longitudinal members (2) and being distinct from the guith teeth (16) for guiding the cables (7), these retaining teeth being fastened to one another by a crossmember (14) to constitute a retaining comb (18) that is mobile in translation longitudinally relative to the longitudinal members (2) without interfering with the prestressing cables (7).
  2. Installation as claimed in claim 1, further including means for immobilising the retaining comb (8) in translation relative to the deck.
  3. Installation according to claim 1 or 2, wherein each retaining tooth (11) for retaining the concrete includes a plurality of points (12, 13) enabling its vertical insertion straddling one or more prestressing cables (7).
  4. Installation according to any one of claims 1 to 3, wherein the retaining comb is mobile vertically relative to the longitudinal members between a low position in which the retaining teeth (11) are inserted between the longitudinal members (2) and a high position in which the retaining teeth (11) are disengaged from the longitudinal members (2).
EP13170491.8A 2012-06-07 2013-06-04 Bench for manufacturing girders by extrusion Active EP2671698B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13170491T PL2671698T3 (en) 2012-06-07 2013-06-04 Bench for manufacturing girders by extrusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1255315A FR2991621B1 (en) 2012-06-07 2012-06-07 WHEEL BEAM MANUFACTURING BENCH

Publications (2)

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EP2671698A1 EP2671698A1 (en) 2013-12-11
EP2671698B1 true EP2671698B1 (en) 2015-12-23

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EP (1) EP2671698B1 (en)
ES (1) ES2560410T3 (en)
FR (1) FR2991621B1 (en)
PL (1) PL2671698T3 (en)
PT (1) PT2671698E (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2593933B1 (en) * 2015-06-09 2017-09-07 Pacadar S.A. Method and tooling for the manufacturing by molding of prestressed concrete elements
CN111186012A (en) * 2020-01-17 2020-05-22 中铁三局集团有限公司 Automatic production line for railway track slabs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2172506A5 (en) * 1972-02-15 1973-09-28 Saret
FR2152604B1 (en) * 1972-09-01 1974-08-19 Saret
CA1100297A (en) * 1977-10-28 1981-05-05 Norman W. Bunn Reinforcing member support in concrete extruders
OA06092A (en) * 1978-03-30 1981-06-30 Saret Improvements to a process and an installation for manufacturing reinforced concrete elements, in particular prestressed concrete.

Also Published As

Publication number Publication date
FR2991621A1 (en) 2013-12-13
FR2991621B1 (en) 2014-06-20
ES2560410T3 (en) 2016-02-18
EP2671698A1 (en) 2013-12-11
PL2671698T3 (en) 2016-05-31
PT2671698E (en) 2016-03-16

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