EP0008820B1 - Verbesserte Einrichtung zur Herstellung vorgespannter Erzeugnisse - Google Patents

Verbesserte Einrichtung zur Herstellung vorgespannter Erzeugnisse Download PDF

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Publication number
EP0008820B1
EP0008820B1 EP79200432A EP79200432A EP0008820B1 EP 0008820 B1 EP0008820 B1 EP 0008820B1 EP 79200432 A EP79200432 A EP 79200432A EP 79200432 A EP79200432 A EP 79200432A EP 0008820 B1 EP0008820 B1 EP 0008820B1
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EP
European Patent Office
Prior art keywords
plate
drawing dies
tracks
installation
products
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79200432A
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English (en)
French (fr)
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EP0008820A3 (en
EP0008820A2 (de
Inventor
Emile Valenty
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'etudes Et Applications Ceramiques (seac) Ste
Original Assignee
D'etudes Et Applications Ceramiques (seac) Ste
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Publication date
Application filed by D'etudes Et Applications Ceramiques (seac) Ste filed Critical D'etudes Et Applications Ceramiques (seac) Ste
Priority to AT79200432T priority Critical patent/ATE1271T1/de
Publication of EP0008820A2 publication Critical patent/EP0008820A2/de
Publication of EP0008820A3 publication Critical patent/EP0008820A3/xx
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Publication of EP0008820B1 publication Critical patent/EP0008820B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • 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

Definitions

  • the invention relates to an improved installation for manufacturing prestressed longiform products, in particular prestressed beams, on tracks of a prefabrication bench. It aims to allow, in an installation operating according to a spinning-extrusion process, to produce prestressed products of desired adjustable lengths, having at their ends lengths of cables protruding from said ends.
  • prestressed beams are manufactured in the factory on benches of several tens of meters in length comprising several parallel tracks. To meet user demand, these beams must be manufactured at adjustable lengths; moreover, certain specifications stipulate that they must have their prestressing cables which protrude at both ends.
  • a first type of relatively old process which is illustrated by US Pat. No. 3,608,163, consists in equipping the installation with molds arranged along the bench and passing over these molds a machine for pouring concrete, known as " layer ", which presents the length of the products to be manufactured and advances discontinuously, step by step, along the bench.
  • This machine is provided at its two ends with two plates. When it stops, the plates are lowered so as to close sections of molds and the concrete is poured until filling these sections of molds; after a certain drying time, the plates are raised and the laying machine is brought to advance by one step to produce a new series of products in neighboring sections of molds. Under these conditions it is understandable that there is no difficulty in preserving between the aligned products empty intervals where the prestressing cables remain bare. When the products are dry, these cables are cut and we obtain products with cables that protrude at their ends.
  • the plates situated at the two ends of the laying machine are controlled to descend and to go up while the machine is stopped: they have the simple function of closing the sections of fixed molds, au- above which the laying machine is located, to prevent the concrete from spreading at the two ends of these sections. These plates are raised before restarting the laying machine and have no use during its movements.
  • Another manufacturing process derived from the first, consists in advancing a machine for pouring concrete, continuously, along a bench equipped with fixed molds. This faster process poses a problem in stopping the beams and leaving part of the prestressing cables bare between them.
  • the manufacturers have solved this problem by providing so-called intermediate pieces, which are placed in a fixed position along the molds at the intervals between beams. These spacers fill the mold in these intervals and there is no concrete discharge when the concrete pouring machine passes over them.
  • this process which can be illustrated by US Pat. No. 4,051,216, has several drawbacks: the need for a battery of molds along the bench, long and tedious installation of the intermediate pieces, risk of tearing them off. ci by the machine as it passes, lack of flexibility for length adjustments, delicate removal of these spacers after the concrete has dried, etc.
  • the present invention relates to an improved installation of the type mentioned above, operating by extrusion-extrusion; an objective of the invention is to satisfactorily solve the problem of separations between beams.
  • One of the aims of the invention is in particular to benefit from the advantages of the extrusion-extrusion processes, while eliminating the intermediate pieces along the bench, so as to eliminate all the drawbacks relating thereto.
  • Another objective is to considerably increase the flexibility of adjusting the lengths of products until it is possible to program these without any manipulation on the bench.
  • Another objective is to achieve these results by a simple modification of existing spinning machines, which does not significantly increase the cost.
  • the improved installation according to the invention comprises a continuous spinning machine adapted to be able to move along a prefabrication bench and comprising, at its rear part, dies whose orifices have the profile of the products to be manufacture and are open at the bottom at the level of the tracks over widths equal to those of the heels of said products;
  • the spinning machine comprises at the rear of the dies, a movable closure plate provided with notches of shape and position corresponding to those of the prestressing cables to allow them to be housed therein for the descent of the plate, and means for guiding and driving means of said plate adapted to allow it to be moved between a raised position where the dies are fully released and a low position where the plate extends to near the tracks and closes said channels.
  • the spinning machine continuously advances along the bench; when it has progressed by a length corresponding to that of the desired products, the cover plate is lowered by the action of the drive means, the machine continuing to advance at constant speed: in this way the outlet of the concrete is interrupted over an adjustable length (in general of the order of about twenty centimeters for prestressed beams in order to leave about ten centimeters of cables protruding at the end of the two neighboring beams).
  • the plate is then raised and the concrete spinning resumes.
  • the prestressing cables are housed in the notches thereof provided for this purpose; these cables are thus left exposed along the interval between beams where the concrete is interrupted. They will be sectioned in a conventional manner once the concrete of the products has hardened.
  • control of the shutter plate of the spinning machine can be carried out manually or automatically by equipping these machines with control units, in particular electronic, capable of triggering the various sequences of a work program determined in in order to obtain products at the requested lengths.
  • this program can be managed on a computer as and when manufactured according to stocks and other data.
  • the prefabrication installation targeted by the present invention comprises a bench B with several tracks, provided at each end with a conventional system for tensioning the prestressing cables (not shown). On either side of the tracks are arranged rails 1 and 2 extending all along the bench.
  • the installation is equipped with a continuous spinner machine P which can be seen diagrammatically in FIGS. 1 and 2 and the rear part of which can be seen in FIG. 3.
  • this spinning machine is immobilized at the start of the tracks and the hopper is filled with concrete; this descends by gravity into the pre-mold; the vibration of the latter allows a uniform filling thereof (its length is of the order of 3 m).
  • the traction winch is started and, by the push of the concrete contained in the pre-mold, the latter is extruded in the dies 3 (which themselves do not vibrate).
  • a closure plate 5 is arranged at the rear of the machine across the width of the latter.
  • This plate is vertically movable and is linked to two vertical slides 6 and 7 which guide it laterally.
  • Each slide is constituted by a guide cylinder fixed to the frame of the machine and by a movable rod fixed to the cover plate.
  • support rollers 8 and 9 are arranged at the lower end of descending supports 10 and 11 secured on the frame at the rear of the dies between two outputs from neighboring dies; the shutter plate 5 which is movable between a raised position where the die outlets are completely free and a low position near the tracks, is thus guided during its descent between the rear face of the die and the support rollers 8 and 9 which exert on this plate a pressure opposite to the pressure of the concrete.
  • the shutter plate 5 is driven by a vertical cylinder 12, in particular a hydraulic cylinder, which makes it possible to lower or raise it.
  • This cylinder is located on the median axis of the machine.
  • the plate 5 is provided at its lower part with notches such as 13, which have a suitable shape and position to form housings for the prestressing cables during the descent of the plate.
  • This plate is preferably bevelled in its lower part 5a in order to facilitate its penetration into the concrete of the beams during the descent of the plate.
  • FIG. 3 shows only the cheeks of a single beam.
  • the invention is not limited to the terms of the above description, but includes all variants thereof. It extends in particular to the manufacture by extrusion-extrusion of any elongated product in prestressed concrete.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Metal Extraction Processes (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Ropes Or Cables (AREA)

Claims (5)

1. Verbesserte Anlage für die Herstellung von vorgespannten Längsprodukten hauptsächlich von vorgespannten Balken aus zähflüssigen Beton auf die Bahnen eines Vorvertigungsstandes, diese Anlage bestehend aus einer Fließspannmaschine, die sich den Stand entlang bewegen kann und zu der auf dem Hinterteil Kluppen gehören, deren Öffnungen das Profil der zu herstellenden Produkte haben, diese Öffnungen befindend sich am unteren Teil enganliegend der Bahnen, deren Länge der Schulterlänge der Produkte entspricht, dadurch gekennzeichnet, daß die Spannmaschine am hinteren Teil der Kluppen eine bewegliche Blindplatte hat, die mit Aussparungen versehen ist, deren Form und Stelle den jenigen der vergespannten Kabel angepasst sind, so daß die Kabel in diesen Aussparungen untergebracht sind, wenn die Blindplatte abgesenkt wird, und durch Steurungs- und Antriebsmitteln für die vorgenannte Platte, die dazu dienen, die Platte hoch zu bewegen, damit die Kluppen völlig frei sind, und die Platte niedriger zu stellen, nahe bei den Bahnen, so daß die Kluppen verschlossen sind.
2. Verbesserte Anlage gemäß des Anspruchs 1, dadurch gekennzeichnet, daß die Steurungsmittels der Blindplatte am hinteren Teil der Spannmaschine aus senkrecht Gleitschienen bestehen, mit denen die Blindplatte verbunden ist, sowie aus Stützrollen am unteren Teil von herabgestellten Trägern am hinteren Teil der Kluppen zwischen Zwei nebenstehenden Kluppenenden, so daß, wenn die Blindplatte abgesenkt wird, wird sie zwischen dem Kluppenhinterteil und den Stützrollen gesteuert, die auf die Platte einen Druck im entgegengesetzten Sinn zu dem Material in den Kluppen ausüben.
3. Verbesserte Anlage gemäß Anspruch 1 oder 2, auf der die Antriebsmittels der Blindplatte mit einem senkrechten Stellglied versehen sind.
4. Verbesserte Anlage gemäß Anspruch 1, 2 oder 3 dadurch gekennzeichnet, daß das Unterteil der Blindplatte abgeschrägt ist, so daß beim Absenken die Blindplatte leichter ins Material der Balken eingeführt werden kann.
5. Verbesserte Anlage gemäß Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, daß für jeden Balken Backen auf der Blindplatte geschweißt sind, Backen reichend bis zum Hinterteil der Maschine auf die rechte Flanke jedes Balkens und nehmend die Form von diesen Flanken an, so daß das Endteil jedes schon gegossenen Balkens gesteuert wird, wenn die Blindplatte abgesenkt wird.
EP79200432A 1978-09-05 1979-08-06 Verbesserte Einrichtung zur Herstellung vorgespannter Erzeugnisse Expired EP0008820B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79200432T ATE1271T1 (de) 1978-09-05 1979-08-06 Verbesserte einrichtung zur herstellung vorgespannter erzeugnisse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7826379 1978-09-05
FR7826379A FR2435335A1 (fr) 1978-09-05 1978-09-05 Installation perfectionnee pour la fabrication de produits precontraints

Publications (3)

Publication Number Publication Date
EP0008820A2 EP0008820A2 (de) 1980-03-19
EP0008820A3 EP0008820A3 (en) 1980-04-02
EP0008820B1 true EP0008820B1 (de) 1982-06-30

Family

ID=9212630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200432A Expired EP0008820B1 (de) 1978-09-05 1979-08-06 Verbesserte Einrichtung zur Herstellung vorgespannter Erzeugnisse

Country Status (5)

Country Link
EP (1) EP0008820B1 (de)
AT (1) ATE1271T1 (de)
DE (1) DE2963240D1 (de)
ES (1) ES483554A1 (de)
FR (1) FR2435335A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2484323A2 (fr) * 1980-06-11 1981-12-18 Applic Ceramiques Sa Et Installation perfectionnee pour la fabrication de produits precontraints, en particulier de poutrelles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1568289A (de) * 1968-03-26 1969-05-23
US3608163A (en) * 1969-07-07 1971-09-28 Pomeroy & Co Inc J H Apparatus for production of prestressed molded concrete members
US4051216A (en) * 1971-10-27 1977-09-27 Concrete Industries (Monier) Limited In-line moulding of prestressed concrete articles

Also Published As

Publication number Publication date
ES483554A1 (es) 1980-05-16
ATE1271T1 (de) 1982-07-15
FR2435335B1 (de) 1983-02-11
EP0008820A3 (en) 1980-04-02
FR2435335A1 (fr) 1980-04-04
EP0008820A2 (de) 1980-03-19
DE2963240D1 (en) 1982-08-19

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