EP0021905A1 - Method and device for stripping prestressed concrete products moulded on a long bed - Google Patents

Method and device for stripping prestressed concrete products moulded on a long bed Download PDF

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Publication number
EP0021905A1
EP0021905A1 EP80400783A EP80400783A EP0021905A1 EP 0021905 A1 EP0021905 A1 EP 0021905A1 EP 80400783 A EP80400783 A EP 80400783A EP 80400783 A EP80400783 A EP 80400783A EP 0021905 A1 EP0021905 A1 EP 0021905A1
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EP
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Prior art keywords
molds
mold
reinforcements
elements
movable
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EP80400783A
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German (de)
French (fr)
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EP0021905B1 (en
Inventor
Pierre Legrand
Pierre Guinard
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Freyssinet International STUP SA
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Freyssinet International STUP SA
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Priority to AT80400783T priority Critical patent/ATE3191T1/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
    • 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

Definitions

  • the present invention relates to a method and a device for demolding, under tension of the reinforcements which they comprise, of prestressed concrete elements molded on a long bench.
  • the present invention overcomes these drawbacks.
  • each of the elements prior to the relaxation of the tension of the reinforcements, each of the elements is detached from its mold by an upward thrust exerted on a movable portion at least of the bottom of this mold, then kept raised until the tension is released and then cutting of reinforcements.
  • the thrust can be provided by any means (hydraulic, mechanical, pneumatic). For all the rows of molds, the necessary thrusts can be exerted simultaneously or else be staggered over time.
  • the necessary thrusts are provided by sets of mobile ramps in inclined plane, coupled in file and movable, along the elongated area, by a tractor mechanism.
  • the latter is advantageously formed by one or more cylinders.
  • each ramp to a movable portion of the mold is preferably obtained by means of a guided pusher, directly or indirectly operated by a sliding pad or a roller cooperating with said ramp.
  • the molds capable of sliding on elastic supports so as to allow, on the one hand their longitudinal positioning on the bench, on the other hand their vibrations after filling, are associated, each with relative vertical freedom of movement, to a crew capable of rolling on the mobile ramps, harnessed in file by means of traction, crew comprising surfaces capable of acting, after an adjustable dead travel, on the pushers ensuring the moving the movable mold portions.
  • the base A of the long bench is an elongated concrete slab parallel to which are stretched the reinforcing courses B of hard steel between a tensioning beam (not shown) associated with a long-stroke cylinder device and a tensioning beam (also not shown) which, during a final operation, allows the reinforcement to be released.
  • Each mold C suitable in this case for the simultaneous manufacture of six elements D of prestressed concrete (in this case railway sleepers), is carried by two beams 1 which rest on the base A by means of four pads 4 sliding on the pads 2 made of elastomer, covered with sheet 2a.
  • the lifting of the molds is prevented by 7th bars 3 which cross the longitudinal members 1 of the mold in the longitudinal slots 6 and are fixed at each of their ends, between two nuts 7 with two vertical uprights 8 sealed in the base A.
  • Each compartment D of mold C crossed by four of the reinforcements B, comprises towards its ends (see FIG. 3) a movable part 9 of its bottom 10, movable part covered with a flexible menbrane 11 made of elastomer or whose joint with the part fixed is covered with a section of lost adhesive tape to prevent any intrusion of laitance in the lifting mechanism of this mobile part.
  • the movable part is integral with a pusher 12 movable in the guide 13 fixed to the mold compartment, a guide which is extended by the adjustment stud 14 with a lock nut 15.
  • the lower ends of the studs 14 (14 1 to 14 c in FIG. 2) are placed opposite the upper face of a cross member 17, provided at its ends with yokes 18 carrying the rollers of bearing 19.
  • rollers 19, located in the same plane and associated with two consecutive molds C roll on the same ramp 20a of an inclined plane plate 20 which can slide, between two guides 30, on the upper face d another flat metal plate 21 sealed on the base A by means of the raised concrete stud 22, attached to this base.
  • the plates 20 of the same alignment are coupled together by the connecting rods 23 comprising the locking nuts 24 and the length adjustment lanterns 25.
  • the two cross members 17, associated with the same mold C are interconnected by the side members 5, so as to form a frame surrounding the base of the mold.
  • each of the molded elements when after casting, vibration and steam hardening of the concrete in the mold compartments, each of the molded elements must be extracted from its mold, without relaxing the reinforcements, a traction is exerted in the direction of the arrow F on the 'all the rows of plates 20 coupled by the rods 23.
  • the rollers 19 and, consequently the crosspieces 17, are raised, relative to the mold while the lifting of the molds is prevented by the bars 3.
  • sleepers 17 thus come into contact with the studs 14 providing the thrust which lifts the moving parts 9 of the molds.
  • the concrete elements are then detached from their molds and slightly lifted from their bottom. Compared to the length of the reinforcement courses, the slight transverse displacement which results for them hardly changes the tension of these reinforcements. It would, moreover, be possible to simultaneously raise the fastening brackets for these frames.
  • the expansion is carried out, by the end of the bench towards which the plates 20 are displaced (arrow F) so that the displacement of the concrete elements and their molds, resulting from the loosening of the reinforcements, is carried out opposite direction of arrow F, in order to increase the lifting effect of the molded elements.
  • the tensile force on the rods 23 can be supplied by jacks.
  • the ramps having a slope of between 4 and 7%
  • the stroke of the jacks can be of the order of a few decimeters, so that the lifting is of the order of the centimeter.
  • the values of the distances d can be adjusted for the same cross member 17 (or several cross members 17) of so as to obtain successive detachment effects.
  • the invention applies to elongated elements of prestressed concrete by adhesive wires which must have, on their molded faces, hollows or reliefs of reduced height but with a steep draft slope; these elements can be railway sleepers, poles, door frames, pylons for transporting electrical energy.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

A device for removing from their moulds elements made of pre-stressed concrete employing stretched adherent reinforcements on a "long bed" and passing through at least one row of moulds of said elements, wherein, prior to the release of the tension of the reinforcements, each of the elements is detached from its mould by an upward thrust exerted on at least one movable portion of the bottom of this mould, then maintained in lifted position until the tension is released and these reinforcements are cut.

Description

La présente invention concerne un procédé et un dispositif de démoulage, sous tension des armatures qu'ils comportent, d'éléments en béton précontraint moulés sur un long banc.The present invention relates to a method and a device for demolding, under tension of the reinforcements which they comprise, of prestressed concrete elements molded on a long bench.

On sait que la fabrication en grande série d'éléments allongés en béton précontraint par des armatures tendues adhérant à ce béton est couramment obtenue au moyen d'un "long banc". Un tel banc comprend, à l'une des extrémités d'une aire plane très allongée (cent mètres pour fixer les idées), des organes de fixation de plusieurs cours d'armatures parallèles et, à l'autre, des moyens de mise en tension simultanée ou non de toutes ces armatures tandis que les moules, disposés en files parallèles le long du banc, sont traversés par lesdites armatures. Après prise et durcissement du béton coulé dans ces moules, la tension des armatures est relâchée, les armatures sont coupées entre moules consécutifs puis les éléments sont démoulés.It is known that the mass production of elongated elements of prestressed concrete by tensile reinforcements adhering to this concrete is commonly obtained by means of a "long bench". Such a bench comprises, at one end of a very elongated flat area (one hundred meters to fix ideas), fasteners for several parallel reinforcement courses and, at the other, means for setting in place simultaneous tension or not of all these reinforcements while the molds, arranged in parallel rows along the bench, are crossed by said reinforcements. After setting and hardening of the concrete poured into these molds, the tension of the reinforcements is released, the reinforcements are cut between consecutive molds then the elements are demolded.

Cette façon de procéder présente un inconvénient lorsque les éléments moulés doivent comporter localement des creux ou des reliefs normalement obtenus, respectivement, au moyen de bossages ou de dépressions à forte dépouille ménagés dans la paroi et le fond du moule. En effet, lors du relâchement de la tension des armatures, les éléments étant encore dans leurs moules respectifs, chacun d'eux se raccourcit par le report de la tension des armatures au béton et, comme le moule ne change pas de dimensions, ces creux et reliefs sont soumis à un effet de cisaillement, de faible amplitude mais très puissant, qui les altère en provoquant notamment des "épaufrures".This procedure has a drawback when the molded elements must locally have recesses or reliefs normally obtained, respectively, by means of bosses or depressions with large undercut formed in the wall and the bottom of the mold. Indeed, during the relaxation of the tension of the reinforcements, the elements still being in their respective molds, each of them is shortened by the transfer of the tension of the reinforcements to the concrete and, as the mold does not change dimensions, these hollows and reliefs are subject to an effect of shear, of small amplitude but very powerful, which alters them by causing in particular "épaufrures".

La présente invention remédie à ces inconvénients.The present invention overcomes these drawbacks.

Selon l'invention, préalablement au relâchement de la tension des armatures, chacun des éléments est décollé de son moule par une poussée ascendante exercée sur une portion mobile au moins du fond de ce moule, puis maintenu soulevé jusqu'à relâchement de la tension puis coupure des armatures.According to the invention, prior to the relaxation of the tension of the reinforcements, each of the elements is detached from its mold by an upward thrust exerted on a movable portion at least of the bottom of this mold, then kept raised until the tension is released and then cutting of reinforcements.

La poussée peut être fournie par des moyens quelconques (hydrauliques, mécaniques, pneumatiques). Pour l'ensemble des files de moules, les poussées nécessaires peuvent être exercées simultanément ou bien être échelonnées dans le temps.The thrust can be provided by any means (hydraulic, mechanical, pneumatic). For all the rows of molds, the necessary thrusts can be exerted simultaneously or else be staggered over time.

Dans une forme avantageuse de mise en oeuvre de l'invention, les poussées nécessaires sont fournies par des jeux de rampes mobiles en plan incliné, attelées en file et déplaçables, le long de l'aire allongée, par un mécanisme tracteur. Ce dernier est avantageusement formé d'un ou plusieurs vérins.In an advantageous form of implementation of the invention, the necessary thrusts are provided by sets of mobile ramps in inclined plane, coupled in file and movable, along the elongated area, by a tractor mechanism. The latter is advantageously formed by one or more cylinders.

La transmission de l'action de chaque rampe à une portion mobile de moule est de préférence obtenue par l'intermédiaire d'un poussoir guidé, directement ou indirectement manoeuvré par un patin glissant ou un galet coopérant avec ladite rampe.The transmission of the action of each ramp to a movable portion of the mold is preferably obtained by means of a guided pusher, directly or indirectly operated by a sliding pad or a roller cooperating with said ramp.

On sait toutefois que, dans la réalisation de tels éléments, il est bon, pour obtenir un bon compactage du béton coulé, de soumettre les moules à une vibration et, de préférence, pour obtenir un démoulage plus rapide, à un chauffage à la vapeur.However, it is known that, in the production of such elements, it is good, to obtain a good compaction of the poured concrete, to subject the molds to a vibration and, preferably, to obtain a faster release from the mold, to steam heating. .

En conséquence, dans une forme de réalisation avantageuse de l'invention, il convient d'assurer une séparation mécanique entre le moule comprenant les portions de moules soulevées par la poussée ascendante et les moyens fournissant cette poussée.Consequently, in an advantageous embodiment of the invention, it is necessary to provide a mechanical separation between the mold comprising the mold portions raised by the upward thrust and the means providing this thrust.

Lorsque cette poussée est fournie par des rampes mobiles, un espace peut être ménagé entre deux organes de transmission mécanique intercalés entre la rampe et la partie mobile de moule.When this thrust is provided by movable ramps, a space can be provided between two mechanical transmission members interposed between the ramp and the movable part of the mold.

A cette fin, dans une réalisation préférentielle de l'invention, les moules, susceptibles de glisser sur des supports élastiques de façon à permettre, d'une part leur mise en place longitudinale sur le banc, d'autre part leurs vibrations après remplissage, sont associés, chacun avec liberté de déplacement vertical relative, à un équipage capable de rouler sur les rampes mobiles, attelées en file au moyen de traction, équipage comportant des surfaces capables d'agir, après une course morte réglable, sur les poussoirs assurant le déplacement des portions mobiles de moule.To this end, in a preferred embodiment of the invention, the molds, capable of sliding on elastic supports so as to allow, on the one hand their longitudinal positioning on the bench, on the other hand their vibrations after filling, are associated, each with relative vertical freedom of movement, to a crew capable of rolling on the mobile ramps, harnessed in file by means of traction, crew comprising surfaces capable of acting, after an adjustable dead travel, on the pushers ensuring the moving the movable mold portions.

La description qui va suivre en regard du dessin annexé, permettra de bien comprendre comment l'invention peut être mise en oeuvre.The description which follows with reference to the appended drawing will make it possible to understand clearly how the invention can be implemented.

  • La figure 1 est une élévation latérale partielle de deux moules successifs placés sur un long banc; cette élévation correspond à la ligne de coupe I-I de la figure 2 ;Figure 1 is a partial side elevation of two successive molds placed on a long bench; this elevation corresponds to the section line I-I of FIG. 2;
  • la figure 2 est une vue suivant II-II de la figure 1 de l'un de ces moules ;Figure 2 is a view along II-II of Figure 1 of one of these molds;
  • la figure 3 est une coupe agrandie selon III-III de la figure 1.Figure 3 is an enlarged section along III-III of Figure 1.

La base A du long banc est un radier allongé de béton parallèlement auquel sont tendus les cours d'armature B en acier dur entre un chevêtre de tension (non représenté) associé à un dispositif de vérin à longue course et un chevêtre de détension (également non représenté) qui, au cours d'une opération finale, permet le relâchement des armatures. Chaque moule C, approprié en l'espèce à la fabrication simultanée de six éléments D de béton précontraint (en ce cas des traverses de chemin de fer), est porté par deux longerons 1 qui reposent sur la base A par l'intermédiaire de quatre patins 4 glissant sur les plots 2 en élastomère, recouverts de tôle 2a.The base A of the long bench is an elongated concrete slab parallel to which are stretched the reinforcing courses B of hard steel between a tensioning beam (not shown) associated with a long-stroke cylinder device and a tensioning beam (also not shown) which, during a final operation, allows the reinforcement to be released. Each mold C, suitable in this case for the simultaneous manufacture of six elements D of prestressed concrete (in this case railway sleepers), is carried by two beams 1 which rest on the base A by means of four pads 4 sliding on the pads 2 made of elastomer, covered with sheet 2a.

Un déplacement longitudinal limité des éléments en béton et des moules, en raison du raccourcissement provenant du relâchement final des armatures, est permis par glissement des patins 4 sur les surfaces 2a. Le soulèvement des moules est empêché par 7es barres 3 qui traversent les longerons 1 du moule dans les lumières longitudinales 6 et sont fixées à chacune de leurs extrémités, entre deux écrous 7 à deux montants verticaux 8 scellés dans la base A.A limited longitudinal displacement of the concrete elements and of the molds, due to the shortening resulting from the final relaxation of the reinforcements, is allowed by sliding of the pads 4 on the surfaces 2a. The lifting of the molds is prevented by 7th bars 3 which cross the longitudinal members 1 of the mold in the longitudinal slots 6 and are fixed at each of their ends, between two nuts 7 with two vertical uprights 8 sealed in the base A.

Chaque compartiment D de moule C, traversé par quatre des armatures B, comporte vers ses extrémités (voir figure 3) une partie mobile 9 de son fond 10, partie mobile recouverte d'une menbrane souple 11 en élastomère ou dont le joint avec la partie fixe est couvert d'un tronçon de bande adhésive perdu pour éviter toute intrusion de laitance dans le mécanisme de soulèvement de cette partie mobile. La partie mobile est solidaire d'un poussoir 12 mobile dans le guide 13 fixé au compartiment de moule, guide qui est prolongé par le goujon de réglage 14 à contre-écrou 15.Each compartment D of mold C, crossed by four of the reinforcements B, comprises towards its ends (see FIG. 3) a movable part 9 of its bottom 10, movable part covered with a flexible menbrane 11 made of elastomer or whose joint with the part fixed is covered with a section of lost adhesive tape to prevent any intrusion of laitance in the lifting mechanism of this mobile part. The movable part is integral with a pusher 12 movable in the guide 13 fixed to the mold compartment, a guide which is extended by the adjustment stud 14 with a lock nut 15.

A chacune des extrémités du moule C, les extrémités inférieures des goujons 14 (141 à 14c sur la figure 2) sont placées en regard de la face supérieure d'une traverse 17, munie à ses extrémités de chapes 18 portant les galets de roulement 19.At each end of the mold C, the lower ends of the studs 14 (14 1 to 14 c in FIG. 2) are placed opposite the upper face of a cross member 17, provided at its ends with yokes 18 carrying the rollers of bearing 19.

En l'espèce, les galets 19, situés dans le même plan et associés à deux moules C consécutifs, roulent sur la même rampe 20a d'une plaque en plan incliné 20 qui peut glisser, entre deux guides 30, sur la face supérieure d'une autre plaque métallique plane 21 scellée sur la base A par l'intermédiaire du plot de béton dressé 22, rapporté sur cette base.In this case, the rollers 19, located in the same plane and associated with two consecutive molds C, roll on the same ramp 20a of an inclined plane plate 20 which can slide, between two guides 30, on the upper face d another flat metal plate 21 sealed on the base A by means of the raised concrete stud 22, attached to this base.

Les plaques 20 d'un même alignement sont attelées entre elles par les tiges de liaison 23 comportant les écrous de blocage 24 et les lanternes de réglage en longueur 25.The plates 20 of the same alignment are coupled together by the connecting rods 23 comprising the locking nuts 24 and the length adjustment lanterns 25.

Les deux traverses 17,associées à un même moule C, sont reliées entre elles par les longerons 5, de façon à former un cadre entourant la base du moule. Entre les extrémités des longerons 1 et les plaques 27 fixées entre les ailes des traverses 17, sont interposées des plaques épaisses d'élastomère 28 qui rendent ledit cadre solidaire du moule dans ses déplacements longitudinaux mais autorisent, en coopération avec les plots élastiques 2 et les lumières 6, la vibration de ce moule sans transmission excessive d'énergie vibratoire vers la base A.The two cross members 17, associated with the same mold C, are interconnected by the side members 5, so as to form a frame surrounding the base of the mold. Between the ends of the side members 1 and the plates 27 fixed between the wings of the crosspieces 17, are interposed thick plates of elastomer 28 which make said frame integral with the mold in its longitudinal displacements but allow, in cooperation with the elastic studs 2 and the lights 6, the vibration of this mold without excessive transmission of vibratory energy to the base A.

En outre, à cette fin, entre les têtes de goujons 14 et la traverse correspondante 17 est ménagé un espace d (figure 3).In addition, for this purpose, between the stud heads 14 and the corresponding cross member 17 is provided a space d (Figure 3).

Ainsi, lorsqu'après coulée, vibration et durcissement à la vapeur du béton dans les compartiments de moule, chacun des éléments moulés doit être extrait de son moule, sans détendre les armatures, une traction est exercée dans le sens de la flèche F sur l'ensemble des files de plaques 20 attelées par les tiges 23. Par les rampes 20 les galets 19 et, en conséquence les traverses 17, sont soulevés, par rapport au moule tandis que le soulèvement des moules est empêché par les barres 3. Les traverses 17 viennent ainsi en contact avec les goujons 14 fournissant la poussée qui soulève les parties mobiles 9 des moules. Les éléments de béton sont alors décollés de leurs moules et légèrement soulevés de leur fond. Par rapport à la longueur des cours d'armatures, le léger déplacement transversal qui en résulte pour ceux-ci ne change guère la tension de ces armatures. Il serait d'ailleurs possible de soulever simultanément les chevêtres d'attache de ces armatures.Thus, when after casting, vibration and steam hardening of the concrete in the mold compartments, each of the molded elements must be extracted from its mold, without relaxing the reinforcements, a traction is exerted in the direction of the arrow F on the 'all the rows of plates 20 coupled by the rods 23. By the ramps 20 the rollers 19 and, consequently the crosspieces 17, are raised, relative to the mold while the lifting of the molds is prevented by the bars 3. sleepers 17 thus come into contact with the studs 14 providing the thrust which lifts the moving parts 9 of the molds. The concrete elements are then detached from their molds and slightly lifted from their bottom. Compared to the length of the reinforcement courses, the slight transverse displacement which results for them hardly changes the tension of these reinforcements. It would, moreover, be possible to simultaneously raise the fastening brackets for these frames.

Il est donc alors possible, sans risques d'épaufrures (notamment pour les logements de patins à rails), de détendre les armatures puis de les couper, au ras des faces d'extrémité de chacun des moules, pour libérer chacun des éléments moulés.It is therefore possible, without risk of spalling (especially for rail shoe housings), to relax the reinforcements then cut them, flush with the end faces of each of the molds, to release each of the molded elements.

De préférence, la détension s'effectue, par l'extrémité du banc vers laquelle sont déplacées les plaques 20 (flèche F) de manière que le déplacement des éléments en béton et de leurs moules, résultant du relâchement des armatures, s'effectue en sens inverse de la flèche F, afin d'accroître l'effet de soulèvement des éléments moulés.Preferably, the expansion is carried out, by the end of the bench towards which the plates 20 are displaced (arrow F) so that the displacement of the concrete elements and their molds, resulting from the loosening of the reinforcements, is carried out opposite direction of arrow F, in order to increase the lifting effect of the molded elements.

L'effort de traction sur les tiges 23 peut être fourni par des vérins. A titre indicatif, pour des traverses de chemin de fer à patins, les rampes ayant une pente comprise entre 4 et 7 %, la course des vérins peut être de l'ordre de quelques décimètres, de façon que le soulèvement soit de l'ordre du centimètre.The tensile force on the rods 23 can be supplied by jacks. As an indication, for railway sleepers with skids, the ramps having a slope of between 4 and 7%, the stroke of the jacks can be of the order of a few decimeters, so that the lifting is of the order of the centimeter.

Afin d'éviter que le décollement de tous les éléments moulés se produise simultanément, ce qui pourrait nécessiter des vérins de puissance excessive, on peut régler les valeurs des distances d (figure 3) pour une même traverse 17 (ou plusieurs traverses 17) de façon à obtenir des effets de décollement successifs.In order to prevent the detachment of all the molded elements from occurring simultaneously, which could require cylinders of excessive power, the values of the distances d (figure 3) can be adjusted for the same cross member 17 (or several cross members 17) of so as to obtain successive detachment effects.

On peut, par exemple, à l'aide de cales d'épaisseur appropriée, ajuster les goujons 143 et 144 (figure 2) pour un premier décollement simultané, puis avec une cale un peu plus épaisse ajuster la distance d à une valeur un peu plus grande pour les goujons 142 et 145 puis avec une cale plus épaisse encore ajuster les goujons 141 et 146.We can, for example, using shims of appropriate thickness, adjust the studs 14 3 and 14 4 (Figure 2) for a first simultaneous detachment, then with a slightly thicker shim adjust the distance d to a value slightly larger for studs 14 2 and 14 5 then with an even thicker shim adjust studs 14 1 and 14 6 .

Aux mêmes fins, il est également possible de fixer à demeure sur la face supérieure des traverses 17, sous les têtes des goujons, des plaques d'épaisseur croissante (ou des plaques superposées) puis d'aligner par ajustage toutes les têtes de goujons sur une réglette unique d'épaisseur uniforme correspondant à la distance d minimale insérée entre les plaques les plus épaisses et les têtes des goujons telles que 143 et 144. For the same purposes, it is also possible to fix permanently on the upper face of the crosspieces 17, under the heads of the studs, plates of increasing thickness (or superimposed plates) then to align by adjustment all the heads of studs on a single strip of uniform thickness corresponding to the minimum distance d inserted between the thickest plates and the heads of the studs such as 14 3 and 1 4 4 .

Afin de limiter l'importance de l'effort F, on peut également ne pas soulever simultanément une même file longitudinale d'éléments, à condition d'avoir une variation échelonnée de déplacement vertical très progressive.In order to limit the importance of the force F, it is also possible not to simultaneously raise the same longitudinal file of elements, provided that there is a staggered variation of vertical movement very progressive.

Pour une file d'éléments ayant la même distance d, ceci se fera automatiquement en prenant des tiges de traction 23 à haute résistance, de section constante relativement faible : du fait de l'allongement de ces tiges, ce seront les éléments situés les plus près des vérins de traction qui seront décollés et soulevés en premier, puis les seconds et ainsi de suite. Les rampes 20 et les pistons 12 doivent avoir une course suffisante pour absorber le déploiement horizontal supplémentaire dû à l'allongement des tiges 23.For a line of elements having the same distance d, this will be done automatically by taking high resistance tensile rods 23, of relatively small constant section: due to the elongation of these rods, these will be the most near the traction cylinders which will be lifted off and lifted first, then the second and so on. The ramps 20 and the pistons 12 must have a sufficient stroke to absorb the additional horizontal deployment due to the elongation of the rods 23.

L'invention s'applique aux éléments allongés de béton précontraint par fils adhérents qui doivent comporter, sur leurs faces moulées, des creux ou reliefs de hauteur réduite mais à forte pente de dépouille; ces éléments peuvent être des traverses de chemin de fer, des poteaux, des éléments d'huisserie, des pylônes de transport d'énergie électrique.The invention applies to elongated elements of prestressed concrete by adhesive wires which must have, on their molded faces, hollows or reliefs of reduced height but with a steep draft slope; these elements can be railway sleepers, poles, door frames, pylons for transporting electrical energy.

Claims (12)

1.- Procédé de démoulage d'éléments en béton précontraint par des armatures adhérentes tendues sur un "long banc" et traversant au moins une file de moules des dits éléments, caractérisé par le fait que, préalablement au relâchement de la tension des armatures, chacun des éléments est décollé de son moule par une poussée ascendante exercée sur une portion mobile au moins du fond de ce moule, puis maintenu ainsi soulevé jusqu'à relâchement de la tension et coupure de ces armatures.1.- Method for demoulding prestressed concrete elements by adherent reinforcements stretched on a "long bench" and crossing at least one row of molds of said elements, characterized in that, before the tension of the reinforcements is released, each of the elements is detached from its mold by an upward thrust exerted on a movable portion at least of the bottom of this mold, then kept thus raised until the tension is released and these frames are cut. 2.- Dispositif de mise en oeuvre du procédé selon la revendication 1, comprenant aux extrémités d'une aire plane horizontale allongée, des moyens de tendre et détendre des cours d'armatures parallèles et au moins une file de moules d'éléments en béton traversés par lesdites armatures, moules comprenant chacun au moins une portion mobile verticalement, et au moins un poussoir de soulèvement de cette portion afin de décoller l'élément moulé de son moule, caractérisé par le fait que lesdits poussoirs coopèrent avec des rampes en plan incliné, reposant sur l'aire plane, atteléesen file et déplaçables sur celle-ci à partir des extrémités de ladite aire.2.- Device for implementing the method according to claim 1, comprising at the ends of an elongated horizontal plane area, means for tensioning and relaxing parallel reinforcement courses and at least one line of molds of concrete elements traversed by said reinforcements, molds each comprising at least one vertically movable portion, and at least one lift button for lifting this portion in order to detach the molded element from its mold, characterized in that said lifters cooperate with ramps in inclined plane , resting on the flat area, harnessed in file and movable on it from the ends of said area. 3.- Dispositif selon la revendication 2, comportant des pous- - soirs associés à une pluralité de moules, alignés transversalement au banc et actionnés par une même traverse, caractérisé en ce que chacune des extrémités de cette traverse coopère avec une rampe par l'intermédiaire d'un organe appliqué contre celle-ci.3.- Device according to claim 2, comprising pushers - evenings associated with a plurality of molds, aligned transversely to the bench and actuated by the same cross member, characterized in that each of the ends of this cross member cooperates with a ramp by the intermediary of an organ applied against it. 4.- Dispositif selon la revendication 3, dans lequel chaque pluralité de moules assemblés est supportée par au moins un longeron pouvant glisser sur l'aire allongée dans le sens de la longueur de celle-ci, caractérisé en ce que ledit longeron est empêché de se soulever par des organes ancrés dans ladite aire.4.- Device according to claim 3, wherein each plurality of assembled molds is supported by at least one spar which can slide on the elongated area in the direction of the length thereof, characterized in that said spar is prevented from to be lifted by organs anchored in said area. 5.- Dispositif selon l'une des revendications 1 à 4, caxac- térisé par le fait que chaque pluralité de moules avec ses portions mobiles est mécaniquement séparée des moyens permettant de soulever lesdites portions mobiles.5.- Device according to one of claims 1 to 4, caxac- Terérized by the fact that each plurality of molds with its movable portions is mechanically separated from the means for lifting said movable portions. 6.- Dispositif selon la revendication 5, caractérisé par le fait qu'un espace est ménagé dans la transmission mécanique entre la rampe mobile et chacun des poussoirs.6.- Device according to claim 5, characterized in that a space is provided in the mechanical transmission between the movable ramp and each of the pushers. 7.- Dispositif selon la revendication 6, dans lequel des supports permettent sans soulèvement le glissement longitudinal des moules, caractérisé en ce que chaque moule est associé, avec liberté de déplacement vertical relatif, à un équipage coopérant avec les rampes mobiles, ledit équipage comportant des surfaces capables d'agir, chacune après une course morte réglable, sur le poussoir correspondant.7.- Device according to claim 6, wherein supports allow without lifting the longitudinal sliding of the molds, characterized in that each mold is associated, with freedom of relative vertical movement, with a crew cooperating with the mobile ramps, said crew comprising surfaces capable of acting, each after an adjustable dead travel, on the corresponding pusher. 8.- Dispositif selon les revendications 3 et 7, caractérisé par le fait que l'équipage mobile comprend, dans le sens longitudinal, pour chaque pluralité de moules, au moins deux traverses coopérant avec les rampes mobiles, traverses rigidement reliées entre elles et dont les faces supérieures agissent sur les poussoirs situés vers les extrémités de chaque moule.8.- Device according to claims 3 and 7, characterized in that the movable assembly comprises, in the longitudinal direction, for each plurality of molds, at least two sleepers cooperating with the mobile ramps, sleepers rigidly connected together and of which the upper faces act on the pushers located towards the ends of each mold. 9.- Dispositif selon la revendication 8, caractérisé par le fait que les poussoirs comportent, en direction de la surface supérieure de la traverse correspondante, un goujon fileté de réglage de la distance entre ladite surface et la tête du dit goujon.9.- Device according to claim 8, characterized in that the pushers comprise, in the direction of the upper surface of the corresponding cross member, a threaded stud adjusting the distance between said surface and the head of said stud. 10.- Dispositif selon la revendication 9, caractérisé par le fait que, pour chaque pluralité de moules, les distances effectives entre les têtes de goujons correspondant à chaque moule et la surface supérieure de la traverse correspondante sont différentes.10.- Device according to claim 9, characterized in that, for each plurality of molds, the effective distances between the stud heads corresponding to each mold and the upper surface of the corresponding crosspiece are different. 11.- Dispositif selon la revendication 2, caractérisé par le fait qu'il est équipé d'un agencement de relâchement de la tension des armatures du côté du banc tourné vers les petites côtes des rampes en plan incliné.11.- Device according to claim 2, characterized in that it is equipped with an arrangement for relaxing the tension of the reinforcements on the side of the bench facing the small sides of ramps in inclined plane. 12.- Dispositif selon la revendication 2, caractérisé par le fait que les rampes mobiles, agissant dans des conditions identiques sur une même file de moules, sont attelées entre elles par des tiges capables d'une variation de longueur élastique.12.- Device according to claim 2, characterized in that the mobile ramps, acting under identical conditions on the same row of molds, are coupled together by rods capable of varying elastic length.
EP80400783A 1979-06-13 1980-06-03 Method and device for stripping prestressed concrete products moulded on a long bed Expired EP0021905B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400783T ATE3191T1 (en) 1979-06-13 1980-06-03 METHOD AND DEVICE FOR DEMOLDING PRE-STRESSED CONCRETE OBJECTS MANUFACTURED IN A STRESSING BED.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915131 1979-06-13
FR7915131A FR2458368A1 (en) 1979-06-13 1979-06-13 METHOD AND DEVICE FOR DEMOLISHING PRECONTRATED CONCRETE ELEMENTS MOLDED ON A LONG BENCH

Publications (2)

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EP0021905A1 true EP0021905A1 (en) 1981-01-07
EP0021905B1 EP0021905B1 (en) 1983-05-04

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EP80400783A Expired EP0021905B1 (en) 1979-06-13 1980-06-03 Method and device for stripping prestressed concrete products moulded on a long bed

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US (1) US4330243A (en)
EP (1) EP0021905B1 (en)
JP (1) JPS5820771B2 (en)
AT (1) ATE3191T1 (en)
BR (1) BR8003667A (en)
CA (1) CA1160819A (en)
DE (1) DE3062952D1 (en)
ES (1) ES8101456A1 (en)
FR (1) FR2458368A1 (en)
IN (1) IN154503B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263024A2 (en) * 1986-10-01 1988-04-06 Rector S.A. Device for removing and handling concrete articles cast in fixed moulds
WO1992008589A1 (en) * 1990-11-20 1992-05-29 Schokbeton B.V. Apparatus for manufacturing prestressed concrete railway ties, and ties manufactured using such apparatus
BE1004584A3 (en) * 1990-08-29 1992-12-15 Coussee Marc Method and device for producing t-shaped beams from pre-stressed concrete

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6438356U (en) * 1987-08-31 1989-03-07
CZ2011732A3 (en) * 2011-11-15 2013-05-22 Active Optix S.R.O. Process for producing products of geopolymeric composite
CN116876905B (en) * 2023-07-10 2024-02-23 广东永基电力器材厂有限公司 Steel plate composite type concrete electric pole and preparation method thereof

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GB726370A (en) * 1953-06-17 1955-03-16 Eugen Schulz Improvements in or relating to the manufacture of concrete bodies
US4102957A (en) * 1975-11-20 1978-07-25 Canfarge Ltd (Francon Division) Apparatus and method for manufacturing prestressed concrete railway ties
FR2385510A1 (en) * 1977-03-28 1978-10-27 Costamagna & Cie B M IMPROVEMENTS IN THE MANUFACTURING OF PRE-STRESSED PRODUCTS
FR2388654A1 (en) * 1977-04-29 1978-11-24 A Betong Ab PROCESS FOR THE MANUFACTURING OF PRE-STRESSED CONSTRUCTION ELEMENTS
FR2403431A1 (en) * 1977-09-14 1979-04-13 Costamagna & Cie B M Prestressed concrete reinforced T=shaped girder - consists of shoulder and web, in side of which are notches for facilitating removal from mould
BE877734R (en) * 1978-08-31 1979-11-16 Costamagna & Cie B M IMPROVEMENTS IN THE MANUFACTURING OF PRE-STRESSED PRODUCTS
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

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US3611518A (en) * 1969-10-30 1971-10-12 American Concrete Crosstie Co Apparatus for removing cured concrete articles from pallets

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Publication number Priority date Publication date Assignee Title
GB726370A (en) * 1953-06-17 1955-03-16 Eugen Schulz Improvements in or relating to the manufacture of concrete bodies
US4102957A (en) * 1975-11-20 1978-07-25 Canfarge Ltd (Francon Division) Apparatus and method for manufacturing prestressed concrete railway ties
FR2385510A1 (en) * 1977-03-28 1978-10-27 Costamagna & Cie B M IMPROVEMENTS IN THE MANUFACTURING OF PRE-STRESSED PRODUCTS
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
FR2388654A1 (en) * 1977-04-29 1978-11-24 A Betong Ab PROCESS FOR THE MANUFACTURING OF PRE-STRESSED CONSTRUCTION ELEMENTS
FR2403431A1 (en) * 1977-09-14 1979-04-13 Costamagna & Cie B M Prestressed concrete reinforced T=shaped girder - consists of shoulder and web, in side of which are notches for facilitating removal from mould
BE877734R (en) * 1978-08-31 1979-11-16 Costamagna & Cie B M IMPROVEMENTS IN THE MANUFACTURING OF PRE-STRESSED PRODUCTS
NL7905833A (en) * 1978-08-31 1980-03-04 Costamagna & Cie B M Prestressing bed for precast concrete beams - has mould with fixed slotted end forms and pistons to assist striking

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263024A2 (en) * 1986-10-01 1988-04-06 Rector S.A. Device for removing and handling concrete articles cast in fixed moulds
FR2604944A1 (en) * 1986-10-01 1988-04-15 Costamagna & Cie B M IMPROVED DEVICE FOR DEMOLDING AND HANDLING CONCRETE PRODUCTS MOLDED INTO FIXED MOLDS
EP0263024A3 (en) * 1986-10-01 1989-10-18 B.M. Costamagna S.A. Device for removing and handling concrete articles cast in fixed moulds
BE1004584A3 (en) * 1990-08-29 1992-12-15 Coussee Marc Method and device for producing t-shaped beams from pre-stressed concrete
WO1992008589A1 (en) * 1990-11-20 1992-05-29 Schokbeton B.V. Apparatus for manufacturing prestressed concrete railway ties, and ties manufactured using such apparatus

Also Published As

Publication number Publication date
EP0021905B1 (en) 1983-05-04
DE3062952D1 (en) 1983-06-09
ATE3191T1 (en) 1983-05-15
ES492251A0 (en) 1980-12-16
US4330243A (en) 1982-05-18
ES8101456A1 (en) 1980-12-16
FR2458368A1 (en) 1981-01-02
JPS562111A (en) 1981-01-10
CA1160819A (en) 1984-01-24
BR8003667A (en) 1981-01-13
IN154503B (en) 1984-11-03
FR2458368B1 (en) 1982-10-22
JPS5820771B2 (en) 1983-04-25

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