EP1212180B1 - Verfahren und vorrichtung zur herstellung eines betonproduktes - Google Patents

Verfahren und vorrichtung zur herstellung eines betonproduktes Download PDF

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Publication number
EP1212180B1
EP1212180B1 EP00954695A EP00954695A EP1212180B1 EP 1212180 B1 EP1212180 B1 EP 1212180B1 EP 00954695 A EP00954695 A EP 00954695A EP 00954695 A EP00954695 A EP 00954695A EP 1212180 B1 EP1212180 B1 EP 1212180B1
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EP
European Patent Office
Prior art keywords
core
forming
product
height
tubular member
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 - Lifetime
Application number
EP00954695A
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English (en)
French (fr)
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EP1212180A1 (de
Inventor
Paavo Ojanen
Asko Sarja
Antero Kajava
Teuvo SILLANPÄÄ
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Valkeakoski X-Tec Ltd Oy
Original Assignee
Valkeakoski X-Tec Ltd Oy
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Publication date
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Publication of EP1212180A1 publication Critical patent/EP1212180A1/de
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Publication of EP1212180B1 publication Critical patent/EP1212180B1/de
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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
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
    • B28B3/228—Slipform casting extruder, e.g. self-propelled extruder
    • 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 a method according to the preamble of claim 1 for manufacturing hollow-core slabs of different heights by means of an extrusion continuous-casting machine.
  • the invention also relates to an assembly suited for implementing the method and further relates to a hollow-core concrete slab series that can be manufactured by virtue of the method.
  • the concrete mix is extruded through a mold or nozzle section generally with the help of feeder augers.
  • the casting machine moves propelled by the reaction force of the feeder augers over a casting bed and the finished product remains resting on the bed, whereon it is allowed to harden at least partially.
  • long castings are made that are then trimmed to a length required at the final erection site.
  • the product has a relatively large hollow-core portion that serves to reduce the product weight and amount of mix needed for casting without substantially compromising the product strength.
  • the hollow cores are molded into the product with the help of core-forming members adapted to the auger rear ends.
  • the feeder augers and core-forming members are aligned parallel to the longitudinal axis of the casting bed and the product, whereby the core-troweling or other core-forming member generally is nonrotatable, but may in some machine constructions rotate with the auger.
  • the function of the feeder augers is to propel the concrete mix past the molding member and the nozzle section and to simultaneously exert a compacting pressure on the mix as it is forced through the molding cross section delimited by the nozzle section and the core-forming members.
  • the core-forming member is generally located so that at least a portion thereof extends into the delimited molding cross section.
  • the hollow cores had a circular cross section, whereby the diameter of the auger and the diameter of the core were determined by the slab thickness, and the number of cores adapted laterally over the slab width was made as large as permitted by the minimum possible thickness of the isthmuses between the cores.
  • the shape of the cores and the proportional area thereof in the overall cross-sectional area of the slab was limited, and the number of cores had to be selected according to the slab thickness.
  • the most commonly used slab width is 1200 mm and the respective slab heights are standardized as 150, 200, 265, (250), 320, 400 and 500 mm.
  • the forming member is advantageously mounted in a pivotal manner to the core-forming assembly so as to prevent the forming member from rotating about its longitudinal axis, but instead allowing it to move in some other manner, e.g., so that a compacting motion is attained.
  • Some constructions utilize a mounting technique that allows the core-forming member to perform a limited reciprocating rotation even when the shape of the core-forming member is made noncircular.
  • Prior-art technology is handicapped by needing the feeder auger, the core-forming assembly and the cross section of the nozzle section that define the external dimensions of the cast article to be matched with each other so that the feeder augers will provide a suitable compacting pressure during casting without unduly obstructing the flow of the concrete mix through the cross section of the forming assembly.
  • conventional continuous casting machines are generally designed for the manufacture of a single hollow-core slab type and size.
  • patent 4202658 describes a glide-casting machine for manufacturing hollow core elements. This machine comprises guide plates that follow the shape of the screw feeders in order to guide the flow of the concrete mix.
  • the goal of the invention is achieved by way of shaping the top side of the core-forming member so that the shape of the initial end of the core-forming member jointed to the auger rear end is made equal to the circular envelope of the auger rear end, wherefrom it gradually changes toward the other end of the member toward a shape corresponding to the desired core dimensions of the hollow core to be manufactured, whereby also the underside shape of the nozzle section upper wall is made conforming to the varying shape of the core-forming member top surface.
  • Respective gradual shaping may also be made on the underside surface of the core-forming member, whereby also the underside shape of the core-forming member can be made to change from the auger rear end dimension toward the core dimension and the shape of the concrete mix feed trough 5 is then made conforming to the varying shape of the core-forming member underside surface.
  • the invention provides significant benefits.
  • a single continuous-casting machine can be advantageously used for the manufacture of slabs of different heights and widths.
  • the isthmus thicknesses of the slabs can be optimized irrespective of a change in the hollow core size, since the variations in the core dimensions are accomplished by way of changing the core height without changing the spacing/number of the cores in the slab lateral direction.
  • To change the slab/core height only the core-forming member assembly and the top part of the mold nozzle section must be replaced, which is a relatively uncomplicated operation. Hence, there is no need to realign the locations of the feeder augers when the core dimensions are changed.
  • the aggressive shaping of the compacting beam assembly members over the nozzle section gives a novel type of means.
  • the top portion of the cast cross section can be subjected to a compacting pressure, whereby the compaction in this region is not solely determined by the compacting effect of mere vibration.
  • the flow channels of concrete mix in the cross section of the product being cast can be kept constant, whereby the feed power exerted by the auger is at all times sufficient for the casting operation.
  • the invention also makes it possible to produce slabs of different widths by way of mounting in the lateral direction a required number of core-forming members and feeder augers.
  • the nozzle section is readily subdividable by means of a mold partition to a desired lateral width, as well as the concrete mix feed hopper, too.
  • the concrete casting assembly has a construction similar to conventional continuous-casting machines.
  • a hollow-core slab is cast onto a casting bed 1 or mold that is adapted to support the travel of the casting machine on wheels 9.
  • the operating controls of the machine are mounted in an enclosure 2 at the rear of the machine.
  • This enclosure houses, e.g., the controls of the feeder augers and reinforcement steel inserters and the operating controls of vibrators possibly adapted to the augers.
  • the concrete mix is poured into a feed hopper 3 located above feeder augers 4.
  • Plural augers 4 are used in parallel, whereby the number of the augers is equal to the number of hollow cores in the product.
  • a concrete mix flow guide or feed trough 5 that delimits the concrete mix flow channel formed under the auger 4.
  • the shape of the feed trough 5 may be kept unchanged from run to run, or, advantageously, the shape of the trough is always arranged conforming to the shape of the core-forming member.
  • the nozzle section At the rear end of the auger 4 begins the delimited cross section of the flow channel later called the nozzle section. This nozzle section is delimited by the casting bed 1, the sidewalls of the machine and a compacting beam assembly 7 located above the feeder auger 4.
  • the compacting beam assembly 7 is adapted to be movable in the vertical and horizontal directions by means of an electric-motor-driven actuator 8.
  • This actuator device may be adapted to make the trowel beam assembly perform either a slow compacting movement or a vibratory motion at a higher frequency.
  • the appropriate compaction technique is selected according to the product being manufactured and the properties of the concrete mix being used.
  • a characterizing feature of the present invention is related to the conforming shaping of the combination formed by core-forming member 6 and the trowel beam assembly 7.
  • the height of the core-forming member 6 is made larger than the largest diametral dimension of the feeder auger 4. Accordingly, the largest outer dimension of the core-forming member 6 must be adapted to mate with the rear end of the auger at their mutual interface.
  • the shape of the trowel beam assembly 7 is contoured conforming to the shape of the core-forming member 6, which means that the assembly has an upward flaring portion 10 that conforms in the downstream direction of the concrete flow to the increasing cross section of the nozzle section in a manner allowing the core-forming member to flare in the portion of the nozzle section to the desired dimension of the hollow cores being cast.
  • the trowel beam assembly may be mounted in an adjustable or replaceable manner.
  • FIG. 3 is shown the cross section of a slab manufactured using the above-described embodiment of the continuous-casting machine.
  • the diameter of the core-forming member 6 is substantially equal to the diameter of the feeder auger 4, whereby the trowel beam assembly 7 is made straight in the same manner as the perimeter of the core-forming member.
  • the construction shown in FIG. 6 has the vertical dimension of the core-forming member 6 made smaller than the diameter of the auger 4, whereby the trowel beam assembly must be provided with a slanted portion 12 that conforms to the tapering height of the core-forming member 6.
  • FIGS. 5 and 7 illustrate hollow-core slabs manufactured using these embodiments of the casting machine.
  • the core widths as well as the thicknesses of the intercore isthmuses are kept constant, but the height of the cores are varied according to the slab height in order to optimize the slab dimensions.
  • the shape of the hollow cores can be varied by changing the core-forming members. Obviously, such a change necessitates a simultaneous replacement of the overlying trowel beam assembly into one conforming to the shape of the new core-forming member.
  • the above-described diagrams illustrate a method through which modular core-forming member sets for larger and smaller heights of hollow cores may be obtained by modulating the basic shape of the core-forming member. In this fashion, it is possible to manufacture slabs with standardized size of, e.g., 200/4, 265/4, 320/4, 400/4 and 500/4 on one and the same continuous-casting machine.
  • the spacing between the core-forming members and the lateral locations of the feeder augers are kept constant, while the thicknesses of the intercore isthmuses as well as of the top and bottom shell portions of the hollow-core slab may be varied and adjusted to desired values in the fashion determined by the shaping of the overlying trowel beam assembly and/or the underlying concrete mix flow guide trough.
  • the intermediate slab size of FIG. 4 may be defined to represent the basic shape of the core-forming member adapted to mate with the diameter of the feeder auger and suited for the manufacture of a 320/4-size slab, for instance. Then, the other modular heights of the hollow cross section shown in FIG. 2 and FIG.
  • the nozzle section extrudes a slab 265 mm thick, and yet the compaction space of the concrete mix behaves in a controlled manner by virtue of the proper shaping.
  • this kind of aggressive shaping of the trowel beam assembly offers a novel method of casting process control.
  • trowel beam assembly not only as a concrete mix flow guide and retarder, but also as a backing surface in ramming compaction for the concrete mix to be compacted irrespective of the frequencies and amplitudes used in the.compacting movement.
  • the trowel beam assembly can be implemented either using a beam assembly of the kind described above or as a combination of beams or trowel plates that comprises at least a compacting beam set typically followed by a trowel member.
  • the set of compacting and trowel beams is arranged to be tiltable into different angles and positions so that the inclination of the assembly can be adjusted conforming to the shape of the core-forming member, whereby the height difference between the ingoing and outgoing edges of the assembly in the flow direction of the concrete mix is from 10 to 400 mm, typically in the order of a few centimeters.
  • the ingoing end of the trowel beam assembly can be adjusted even above auger, while the outgoing end is simultaneously located below the top level of the rotational envelope perimeter of the auger.
  • the shape of the trowel beam assembly and the core-forming member may be contoured different from a simple slanted plane, e.g., as an appropriately curved plane.
  • the shape of the surface formed by the trowel beam assembly or other part of the nozzle section that delimits the flow channel must be adapted to conform to the shape of the core-forming member so that the height difference between the ingoing end and the outgoing end of the trowel beam assembly is within a 50 % tolerance equal to the height difference between the top level of the rotational envelope perimeter of the auger and the top level of the core-forming member that trowels the hollow core of the slab.
  • the term core-forming member is used when reference is made to that part of the member over which the concrete is shaped to make a desired core into the slab. In practice, this part is located there where the core-forming member has its largest or smallest outer diameter.
  • nozzle section is used when reference is made to the confined cross section that determines the shape of the outer surfaces of the produced article. While the apparatus embodiment according to the invention described above has no means for shifting the position of the feeder augers in the lateral direction, a provision must be arranged for shifting the augers in the vertical direction if the difference between the selected sizes of the core-forming members is substantial. Normally, the lateral dimension of the core-forming members is kept constant even if the height of the members is varied. In FIG. 8 is shown a series of slab cross sections in which the slab manufactured in the basic shape and width has six hollow cores, while the narrower one has only three cores.
  • the narrower slab in this kind of modular series of slabs could be manufactured by way of, e.g., using a partition to delineate the nozzle section during the casting process.
  • the diameter of the auger may vary over its length, whereby diametral dimensions of the core-forming member must be evaluated relative to the largest diameter of the auger, that is, the rotational envelope perimeter of the maximum diameter of the auger.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Holo Graphy (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (11)

  1. Verfahren zum Herstellen einer Betonprodukt-Serie von Hohlkernplatten in mindestens zwei unterschiedlichen Größen, wobei die Produkte Hohlkerne unterschiedlicher Höhe haben, in welchem Verfahren:
    mindestens eine Zuführschnecke (4) verwendet wird, wobei ein Betongemisch durch einen begrenzten Querschnitt extrudiert wird, der als ein Düsenabschnitt wirkt, und
    am hinteren Ende jeder Zuführschnecke (4), innerhalb der Länge des begrenzten Querschnitts, ein kernbildendes Element (6) eingerichtet ist, welches zum Gestalten eines Hohlkerns in dem herzustellenden Produkt dient,
    dadurch gekennzeichnet, dass
    das kernbildende Element (6) so ausgewählt wird, dass es ein rohrförmiges Element ist, bei welchem am Kern-Glättabschnitt des Elements (6) seine Höhenabmessung so verstellt wird, dass sie gleich der gewünschten Höhe des Hohlkerns in dem Produkt ist,
    eine Glättstangen-Anordnung (7), welche zum Definieren der Oberfläche des Düsenabschnitts dient, so der Gestalt der Oberfläche des kernbildenden Elements (6) angepasst ist, dass der Höhenunterschied zwischen dem Eingangs-Ende und dem Ausgangs-Ende der Glättstangen-Anordnung (7) in der Betongemischflussrichtung innerhalb einer 50%-Toleranz gleich dem Höhenunterschied zwischen dem oberen Level des Rotationshüllumfangs der Schnecke (4) und dem oberen Level des kernbildenden, rohrförmigen Elements (6) ist, welches den Hohlkern des Produkts glättet, und
    um ein Produkt mit unterschiedlicher Größe herzustellen, ein kernbildendes Element (6) und die Glättstangen-Anordnung (7) ausgewählt werden, die zum Definieren der Oberfläche des Düsenabschnitts dienen, der dieser Größe entspricht.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass zum Herstellen von einer Hohlkernplatte in einer Größe für das kernbildende, rohrförmige Element (6) ein rohrförmiges Element ausgewählt wird, wobei die Höhe des kernbildenden Abschnitts kleiner als der größte Durchmesser des Schneckenförderers (4) ist und wodurch die kleinste Höhe mittels einer abwärts geneigten Fläche ausgebildet wird.
  3. Verfahren gemäß Anspruch 2, dadurch gekennzeichnet, dass zum Herstellen eines Produkts in einer ersten Größe ein kernbildendes, rohrförmiges Element ausgewählt wird, welches einen kernbildenden Abschnitt mit einer Höhe kleiner als der größte Durchmesser der Zuführschnecke hat, wobei zum Herstellen eines Produkts in einer zweiten Größe ein kernbildendes, rohrförmiges Element ausgewählt wird, welches einen kernbildenden Abschnitt mit einer Höhe gleich dem größten Durchmesser der Zuführschnecke aufweist, und wobei zum Herstellen eines Produkts in einer dritten Größe ein kernbildendes, rohrförmiges Element ausgewählt wird, welches einen kernbildenden Abschnitt mit einer Höhe größer als der größte Durchmesser der Zuführschnecke hat.
  4. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet , dass die zum Definieren der Oberfläche des Düsenabschnitts dienenden Elemente eine Anordnung aus Glättstangen (7) aufweisen, die in mindestens einer Richtung relativ zum herzustellenden Produkt bewegbar sind, um die Verdichtung des Produkts zu erzielen.
  5. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass der Düsenabschnitt seitlich begrenzt ist, sodass mindestens ein Schneckenförderer (4) und ein kernbildendes, rohrförmiges Element (6) außerhalb des begrenzten Düsenquerschnitts bleiben.
  6. Anordnung zum Herstellen einer Betonprodukt-Serie von Hohlkernplatten in mindestens zwei unterschiedlichen Größen, wobei die Produkte Hohlkerne von unterschiedlicher Höhe haben, wobei die Anordnung aufweist:
    Mittel (1, 7) zum Bilden eines Düsenabschnitts mit einem begrenzten Querschnitt,
    mindestens eine Zuführschnecke (4) zum Extrudieren eines Betongemisches durch den begrenzten Querschnitt hindurch, welcher als ein Düsenabschnitt wirkt, und
    kernbildende, rohrförmige Elemente (6), welche so eingerichtet sind, dass sie an dem hinteren Ende jeder Zuführschnecke (4) montierbar sind,
    dadurch gekennzeichnet, dass
    die kernbildenden, rohrförmigen Elemente (6) sich zumindest bei ihren kernbildenden Abschnitten aus rohrförmigen Elementen mit zwei unterschiedlichen Höhen zusammensetzen, von denen eines von beiden auswählbar ist, um am hinteren Ende der jeweiligen Zuführschnecke (4) montiert zu werden, abhängig von der gewünschten Höhe der Hohlkerne, die in dem Produkt erzeugt werden sollen, und
    die Oberfläche des Düsenabschnitts durch kernbildende, rohrförmige Elemente (6) begrenzt ist, sodass der Höhenunterschied zwischen dem Eingangs-Ende und dem Ausgangs-Ende der Glättstangen-Anordnung (7) in der Betongemisch-Flussrichtung innerhalb einer 50%-Toleranz gleich dem Höhenunterschied zwischen dem oberen Level des Rotationshüllumfangs der Schnecke (4) und dem oberen Level des kernbildenden, rohrförmigen Elements (6) ist, welches den Hohlkern des Produkts glättet.
  7. Anordnung gemäß Anspruch 6, dadurch gekennzeichnet , dass mindestens eines der kernbildenden Elemente (6) so ausgewählt wird, dass die Höhe seines kernbildenden Abschnitts kleiner als der größte Durchmesser des Schneckenförderers ist.
  8. Anordnung gemäß Anspruch 7, gekennzeichnet durch einen Satz von kernbildenden, rohrförmigen Elementen (6), welcher mindestens ein rohrförmiges Element in einer Größe aufweist, welches eine Höhe kleiner als der größte Durchmesser der Zuführschnecke hat, außerdem zum Herstellen eines Produkts einer zweiten Größe eine andere Größe eines rohrförmigen Elements hat, welches eine Höhe gleich dem größten Durchmesser der Zuführschnecke hat, und zum Herstellen eines Produkts einer dritten Größe eine noch andere Größe eines rohrförmigen Elements hat, welches eine Höhe größer als der größte Durchmesser der Zuführschnecke hat.
  9. Anordnung gemäß Anspruch 6, dadurch gekennzeichnet, dass die Elemente, die zum Begrenzen der Oberfläche des Düsenquerschnitts dienen, eine Anordnung von Glättstangen (7) aufweisen, die Mittel (8) zum Bewegen des Glättstangen-Satzes in mindestens einer Richtung relativ zu dem Produkt aufweisen, welches hergestellt wird.
  10. Anordnung gemäß Anspruch 6, gekennzeichnet durch Mittel zum Unterteilen des Düsenabschnitts in Seitenrichtung, sodass mindestens eine Zuführschnecke (4) und ein kernbildendes, rohrförmiges Element (6) außerhalb des begrenzten Düsenquerschnitts bleibt.
  11. Anordnung gemäß Anspruch 6 oder 7, gekennzeichnet durch mindestens ein Betongemischzuführdurchgangsstück (5), welches unterhalb der Zuführschnecken (4) gelegen ist und eine Gestalt aufweist, die so eingerichtet ist, dass es an die Gestalt der Unterseitenfläche des ausgewählten kernbildenden, rohrförmigen Elements (6) angepasst ist.
EP00954695A 1999-08-23 2000-08-22 Verfahren und vorrichtung zur herstellung eines betonproduktes Expired - Lifetime EP1212180B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI991792 1999-08-23
FI991792A FI19991792A (fi) 1999-08-23 1999-08-23 Menetelmä ja sovitelma betonituotteen valmistamiseksi ja betonituotesarja
PCT/FI2000/000712 WO2001014114A1 (en) 1999-08-23 2000-08-22 Method and apparatus for manufacturing a concrete product and a concrete product series

Publications (2)

Publication Number Publication Date
EP1212180A1 EP1212180A1 (de) 2002-06-12
EP1212180B1 true EP1212180B1 (de) 2004-09-08

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EP00954695A Expired - Lifetime EP1212180B1 (de) 1999-08-23 2000-08-22 Verfahren und vorrichtung zur herstellung eines betonproduktes

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EP (1) EP1212180B1 (de)
AT (1) ATE275466T1 (de)
AU (1) AU6705600A (de)
DE (1) DE60013615T2 (de)
FI (1) FI19991792A (de)
WO (1) WO2001014114A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20021092A (fi) * 2002-06-07 2003-12-08 Consolis Technology Oy Ab Menetelmä ja laite betonituotteiden valamiseksi
FI114623B (fi) * 2002-09-16 2004-11-30 Consolis Technology Oy Ab Menetelmä ja laitteisto betonituotteen valamiseksi
FI20031534A (fi) * 2003-10-20 2005-04-21 Consolis Technology Oy Ab Menetelmä ja laitteisto betonielementtien valamiseksi

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049787A (en) * 1959-04-06 1962-08-21 Jr Ralph Haunan Apparatus for extruding prestressed concrete products
FI62783C (fi) * 1977-08-10 1983-03-10 Paraisten Kalkki Oy Glidgjutmaskin avsedd att anvaendas foer framstaellning av haolplattor och liknande
FI71088C (fi) * 1981-11-20 1990-02-13 Christopher B Bunn Pressmaskin foer framstaellning av laongstraeckta produkter av betong.
FI67320C (fi) * 1983-05-09 1985-03-11 Partek Ab Foerfarande och glidgjutanordning foer gjutning av betongstycken
FI70821C (fi) * 1983-05-09 1986-10-27 Partek Ab Foerfarande och glidgjutmaskin foer gjutning av haolplattor avetong
FI76514C (fi) * 1986-04-07 1989-07-31 Kt Suunnittelu Oy Foerfarande och anordning foer gjutning av betongelement.
FI110174B (fi) * 1994-04-07 2002-12-13 Valkeakoski Extec Oy Ltd Laite betonituotteen valmistamiseksi

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AU6705600A (en) 2001-03-19
FI19991792A (fi) 2001-02-24
ATE275466T1 (de) 2004-09-15
EP1212180A1 (de) 2002-06-12
DE60013615T2 (de) 2005-09-22
DE60013615D1 (de) 2004-10-14
WO2001014114A1 (en) 2001-03-01

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