WO1993020990A1 - Procede de moulage de beton en continu par extrusion - Google Patents

Procede de moulage de beton en continu par extrusion Download PDF

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Publication number
WO1993020990A1
WO1993020990A1 PCT/AU1993/000158 AU9300158W WO9320990A1 WO 1993020990 A1 WO1993020990 A1 WO 1993020990A1 AU 9300158 W AU9300158 W AU 9300158W WO 9320990 A1 WO9320990 A1 WO 9320990A1
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WO
WIPO (PCT)
Prior art keywords
mould
concrete
reinforcement
mix
extruded
Prior art date
Application number
PCT/AU1993/000158
Other languages
English (en)
Inventor
Assadollah Redjvani
Original Assignee
Assadollah Redjvani
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Assadollah Redjvani filed Critical Assadollah Redjvani
Publication of WO1993020990A1 publication Critical patent/WO1993020990A1/fr

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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
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/04—Apparatus or processes for treating or working the shaped or preshaped articles for coating or applying engobing layers
    • 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
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
    • 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
    • B28B3/26—Extrusion dies
    • B28B3/2645—Extrusion dies using means for inserting reinforcing members

Definitions

  • This invention relates to a new method of continuously casting concrete by extruding the concrete from a fixed or moving mould.
  • the extruded concrete may contain prestressed reinforcing or other inclusions which are added during the extrusion process.
  • Concrete casting is a well known art and is used generally where there is a need for a number of identical products to be manufactured.
  • Examples of such products are concrete stormwater pipes, concrete interlocking panels used for earth reinforcement, concrete railway sleepers, and in some cases, pre-cast concrete water tanks.
  • each of the above mentioned products is formed entirely by casting in the usual sense in which a mould is formed and filled with concrete and the mould broken only when the concrete is set so that the product can be removed.
  • a means of reinforcement is provided with the concrete being supplied to the mould so as to provide reinforcement for the hardened concrete.
  • This reinforcement may be prestressed.
  • the mould can be adapted to move in concert with the concrete. This can be performed preferably with a conveyor-type mould structure.
  • Composite material can be fed into the extrusion device in the form of fabricated layers or paste to bind with the concrete mix during the extrusion process, providing many of the attributes described later.
  • the physical conditions within the mould can be selected, for example the speed of throughput, temperature, pressure, time, humidity, and chemical processing. Changes in these parameters can accelerate curing and yield
  • Mould walls may be perforated to perform the dewatering process, which assists in the prevention of shrinkage and cracks, and to allow other treatments such as steam curing etc. to be applied as required.
  • the apparatus for performing the extrusion is also disclosed.
  • Fig. 1 is a schematic representation of a mould structure; (also referred to as an
  • FIG. 2 illustrates the mould and extruded concrete product
  • Fig. 3 is a view similar to Fig. 1 but showing an arrangement by which the thickness of the concrete being extruded can be varied;
  • Fig. 4 shows a wedge shaped extruded concrete product
  • Fig. 5 shows a concrete product with a curved cross-section
  • Fig. 6 shows a configuration for production of large concrete storage containers
  • Figs. 7 to 11 show various product shapes that can be achieved using the present invention
  • Fig. 12 illustrates an alternative mould structure
  • Fig. 13 shows a section of a multiple wave profile product formed by the apparatus shown in Fig. 12;
  • Fig. 14 shows a multiple wave profile extruded concrete product
  • Fig. 15 shows an alternative mould structure (extrusion machine) with moving mould walls
  • Fig. 16 shows a wall extruded on top of an existing wall by a mould having 3 walls
  • Fig. 17 shows a ground slab being extruded by a mould having 3 walls
  • Fig. 18 shows the sub-base in a trench, being extruded at the same time as the pipe is being extruded;
  • Fig. 19 shows the sub-base being extruded at the same time as the top slab is
  • the mould has 4 walls;
  • Fig. 20 shows a schematic view of a mould having tapered walls to reduce friction forces
  • Fig. 21 shows a schematic view of a mould having sliding sheets or belts, for the purpose of managing the friction forces.
  • Sliding sheets may rotate like a conveyor belt;
  • Fig. 22 shows a schematic view of a mould for extruding composite materials at the same time as the concrete mix is extruded
  • Fig. 23a shows a cross section of a composite product having cables as the core and concrete as the protective cover. Also a longitudinal section of a product having a different concrete core and concrete cover is shown in Fig. 23b;
  • Fig. 24 shows a schematic view of a mould having a series of vanes which act as a guide to distribute the concrete mix
  • Fig. 25 shows a perforated cubic mould used for sampling of the mix. Some pressure is applied to extract additional water. The sample is strength tested in compression;
  • Fig. 26 shows a schematic view of the equipment used for prestressing the reinforcement
  • Fig. 27 shows a cross section of a T-beam with the reinforcing rod bonded into the concrete
  • Figs. 28a to 281 show examples of products that may be mass produced by extrusion.
  • Figs. 29a to 29j show examples of products that may be extruded on-site.
  • a mould structure 1 which is formed by two parallel plates 2 and 3 each having flanged ends 4 and 5 respectively. Together, the flanged ends 4 and 5 mate with a feeder 6 which permits concrete 15 to be fed into the mould 1.
  • rolls 7 and 8 of reinforcing wire, fabric or mesh which is introduced via holes or slots 9 and 10 between the feeder 6 and the flanged ends 4,5.
  • a pair of guides 13 and 14 are located in the compression zone adjacent to
  • SUBSTITUTE SHEET the flanged ends 4 and 5 respectively to position the mesh 7 and 8 at an appropriate depth within the concrete mix 15.
  • Lubrication points 16 and 17 are also provided to ease the sliding movement of cast concrete. Lubrication points can be scattered through the mould walls as required:
  • the concrete mix 15 is pressurised such that it is compressed between the two plates (walls) 2 and 3.
  • the pressure can be maintained by a pump or other suitable mechanisms.
  • the cast concrete product 18 can then be supported by props if required (not illustrated) to ensure retention of shape whilst hardening is completed.
  • Physical parameters that can be controlled depend upon the length a of the mould 1 as seen in Fig. 2, and the speed at which the concrete 18 exits from the mould 1.
  • the process also utilises a predetermined combination of mixtures such as cement,
  • the extrusion pressure obviates the need for vibration as a means of achieving concrete compaction in many circumstances.
  • the width can be varied using overlapping plate sections which can slide across each other and thereby vary the width of the mould 1.
  • each of the plates (walls) 2 and 3 are connected to a number of hydraulic rams 19 which operate to vary the distance
  • SUBSTITUTE SHEET between the plates 2 and 3 and accordingly, the thickness of the concrete product 18 produced.
  • Such a configuration is useful in the production of a variety of different shell thicknesses, as well as concrete wall sections where generally a greater thickness is required at the base of the wall than at the top.
  • a number of adjustable clamps (not illustrated) can be used to achieve the same effect.
  • FIG. 4 Such an arrangement is shown in Fig. 4 where a wedged profile 20 is shown.
  • the plates 2 and 3 are angled towards each other so as to produce the appropriate profile.
  • FIG. 5 Another arrangement is shown in Fig. 5 where a curved profile 21 is produced.
  • the plates 2 and 3 are curved along the width of the mould 1.
  • FIG. 6 an arrangement which provides for the production of a cylindrical shape, such as that used in a water tower, is shown.
  • a rotating base 22 or rail (not illustrated) is provided upon which a mould 23 is provided at a constant position with respect to the rotating base 22.
  • the mould 23 is curved to match the curvature desired and the concrete mix 15 is input in the manner corresponding to Figs. 1 and 3.
  • the concrete product 24 exits from the mould 23 - it rests upon, and is carried out by the rotating base 22. This provides means for continuous cylindrical profiles to be extruded.
  • the concrete product 24 stays with no relative movement to the base, and the mould 23 is moved to provide continuous casting.
  • This method may be applied to the extrusion of water towers, domes... etc.
  • the concrete mix 15 is input to one end of the mould 23 and is then extruded out of the other end.
  • SUBSTITUTE SHEET can provide for the production of cylindrical or conical casting having a variable profile.
  • An example of such a profile is shown in Fig. 7 where a conical shape 25, is illustrated in which both the length and the width of the mould 1 can have curved sections.
  • Fig. 12 an alterative arrangement of a mould 30 is shown which provides for the production of a curved or waved profile product 46 as seen in Fig. 13.
  • the mould 30 comprises two parallel plates 31 and 32 which are connected by hinges 33 and 34, respectively, to the feeder plate portions 35 and 36. In this manner, the feeder remains in a fixed position for the extrusion of the concrete mix to the interior of the mould 30 between the plates 31 and 32.
  • the plates 31 and 32 are connected by a push rod 37 and fixing pins 40 and 41.
  • the fixing pins 40, 41 permit the plates 31 and 32 to pivot whilst maintaining a parallel disposition.
  • flat end pieces 38 and 39, respectively are provided which are arranged to contact cam ' s 42 and 43 respectively.
  • the cams 42 and 43 are rotated by a common drive but are displaced by 90 degrees. This causes corresponding displacement of the push rod 37 which causes a reciprocating pivotal motion, or pendulum-like motion, of the plates 31 and 32. It will be apparent to those skilled in the art that such a motion, when applied in proportion to the speed of concrete mix passing between the plates 31 and 32 will provide a waved profiled concrete product 46 as seen in Fig. 12.
  • SUBSTITUTE SHEET A further extension of the embodiment shown in Fig. 12 is to provide cammed movement in the vertical plane in addition to providing cammed movement in the horizontal plane (as in Fig. 12).
  • Such a configuration can be achieved by replacing the plates 31 and 32 with a series of interconnected sliding plates operated by a series of cams arranged in both vertical and horizontal planes. It will be apparent to those skilled that an appropriate arrangement of cams and plates can permit the formation of a multiple wave profile concrete product 48 as seen in Fig. 14. Furthermore, it will be apparent that each of the sections A-A and B-B as seen in Fig. 14 will substantially correspond to the waved profile shown in Fig. 13.
  • the concrete product 48 of Fig. 14 provides an increased strength and load bearing capability over that of a flat sheet of concrete and is therefore suitable for wider spans. Also, the profile shown in Fig. 14 can be combined with other profiles such as those of Figs. 8 to 11 if required.
  • the concrete product 48 of Fig.14 can also be produced with the same principles explained in the earlier pages, but with another modified version of mould 1 as shown in Fig. 15.
  • the plates 2 and 3 of the mould 1 of Fig. 1 are transformed to a series of the blades 51 and 52 of the mould 50 as shown in Fig. 15. ( erforation may be required to assist the dewatering process - not shown).
  • Blades 51 and 52 are assembled on the conveyors 53 and 54 and have a motion parallel to the centre line of the mould 50 and to each other.
  • the concrete mix 15 is pressurised and enters through the feeder 6 into the mould 50 and is carried forward by the motion of the blades 51 and 52 until the hardened or partially cured concrete 18 exits the mould 50.
  • the mould 50 can produce three dimensional shapes such as corrugated sheets etc.
  • the blades can have different cross sections, with respect to each other, to produce corrugations or other patterns in three
  • SUBSTITUTE SHEET dimensions Each blade is required to have a similar shaped border to the adjacent blade to ensure that there is no gap between the blades and that there is a continuous flow of extruded material. There are no appreciable friction forces between the mix 15 and the blades 51 and 52.
  • Each of the parallel opposite blades can act as a discrete mould to enable continuous production of discrete elements.
  • the speed of the process is controlled by the rate at which the concrete mix 15 is fed between the blades 51 , 52 thereby causing the blades to move forward.
  • the process speed can be controlled by motors or brakes which cause motion of the conveyors 53 and 54 at a predetermined speed.
  • the conveyors 53 and 54 can follow curved paths which produce products with an overall or global curvature.
  • the blades 51 and 52 can also accept different irregular cross sections and profiles, in the horizontal and vertical planes and varieties of profiles can thereby be produced as well as those shown in Figs. 4 to 11.
  • Fig. 15 shows a mould 50 with curved sections in both the horizontal and vertical planes which will produce the product 48 as shown in Fig. 14.
  • the high compression forces within the mould can not only overcome the friction forces between the mix and the mould walls, but can also cause dewatering of the cast mix, to achieve and control the required low water/cement ratio, which subsequently results in a faster setting, less shrinkage, higher strength, cohesion and reduced permeability.
  • Perforation of the mould walls may be carried out so that there are varying numbers/diameters of holes per unit area, and these holes may spread over different sections of the mould, where the compression and dewatering occurs (compression zone). This would mostly happen within the initial sections of the mould.
  • the perforations shall be designed to allow liquid extraction only. Holes of varying numbers/diameters may also be required through the mould, for the
  • one or more walls may be replaced with a prepared surface.
  • the term "wall” is used for all of the areas exposed to concrete as it passes through the mould).
  • Moderate tapering (widening) of the later sections of the mould walls 2 and 3 in Fig. 20 may be introduced to reduce and bring friction forces within the required limits.
  • sliding sheets 56 or belts of suitable materials like stainless steel shims... etc, can be incorporated to serve as an intermediate between the mix 15 and the mould walls 2 and 3.
  • the sheets or belt will move forward with the mix for the purpose of managing and controlling of the friction forces.
  • the belt may also be used for other purposes such as; applying coatings (by immersing the belt in coating material or rubbing coating material onto the belt while it is rotating outside the mould), or texturing and providing the desired smoothness or three-dimensional pattern (which may ' penetrate the full depth of the product) on the concrete surface.
  • the sliding sheets 56 will rotate (like a conveyor belt) around the longitudinal sections of the mould.
  • Belts can cover the whole length of the mould walls, or can be fed through the slots 81 and 82 provided within and following the compression zone. There are no substantial friction
  • the speed of the belt 56 may be independently controlled so that every possibility between full sliding of the mix 15 relative to the belt 56 and no movement of the mix 15 relative to the belt 56 is encompassed.
  • a mould with one slot or multiple slots 77, 78, 79 and 80 can be used for production of other building materials (other than concrete), where the constituent materials have to be fed in the form of a paste or a paste and fabricated layers. Gypsum panels may be produced in this way (not illustrated).
  • Materials that may be used cover a wide range including steel, aluminium, other metals, wrapped enamelled papers, fabrics, plastics, adhesives, paints, chemicals which may be applied in the form of a paste, sheets or semi-hardened materials such as rubber.
  • Materials can be applied as a temporary measure to assist in manufacture of the extruded concrete, e.g. controlling friction, or accelerating setting and curing, providing patterns and textures to the product surfaces.
  • Fig. 23a Materials can be applied as shown in Fig. 23a, to act as the core 59 of a product (e.g. cable), with concrete 60 to act as the cover. Also a section consisting of concrete (or other material) layers having different characteristics may be produced, e.g. light density concrete 61 as the core surrounded by a layer of heavier density concrete 62 as the shield as shown in Fig. 23b.
  • the incorporation of the reinforcement into the product can be carried out using rods, wires, wire-mesh (woven wire - mesh for conical shapes), sheet material, synthetic or other fibres (cut in pieces or being continuously fed within the mix or fed separately like rods), plastics or a combination of the above materials during the extrusion process.
  • the reinforcement may be selected from both metals and non-metallic materials (e.g. steel fibres, synthetic polystyrene, glass fibre.).
  • Prestressing may be applied to the reinforcement, by utilising one of the following methods (or combinations of these methods);
  • SUBSTITUTE SHEET utilising the principle that materials elongate when exposed to heat. By heating up the reinforcement (by electrical or other means), the reinforcement may be elongated to the extent required during the extrusion process. Well established relationships between temperature and elongation exist for metal bars and wires and so extensions can be easily calculated.
  • the forward driving force resulting from the pumping pressure or other prime mover can be utilised to induce a tensile force or longitudinal prestress in the reinforcement 84 (which is bonded to the hardened concrete 85).
  • the prestress is achieved by providing a braking action (tensioning device) on the drum containing the rolls 7 and 8 from which the reinforcement plays out.
  • Fig. 27 shows a T section containing the reinforcing rod 64.
  • the concrete mix 15 can be fed through a series of vanes 63 into the mould 83, as shown in Fig. 24 which act as a guide, ensuring uniform distribution of the concrete mix across the cross-section.
  • Mould design and manufacture may incorporate some of the above features or combinations of these features.
  • the output from the process may consist of either continuous or discrete elements. This can be achieved by feeding non-binding elements at the end of extruding one product and before extruding the next (non-adhesive pastes may be fed between two discrete products during the extrusion process).
  • the perforated cubic mould 71 can be fabricated in a similar fashion to those used in practice for measuring the strength of concrete mixes 15.
  • Fig. 25 shows the
  • SUBSTITUTE SHEET mould 71 which has a slightly greater height than the ones used in practice. This is to compensate for the volume change due to dewatering through the holes 84 during the compression process. After final setting of the test material and stripping of the mould 71 , the cubic sample 76 will be strength tested by compression. This method presents a simple solution for testing the suitability of the cementitious material to be used in the extrusion process.
  • Figs. 28a to 281 show the examples of products that can be mass produced by manufacturers and precast industries.
  • Civil engineering examples are; Fig. 28a; pipes in standard diameters and lengths, Fig.28b; culverts and channels, Fig. 28c; manholes, Fig. 28d; arches of any size and curvature.
  • Building industries examples are; Fig. 28e; beams of different cross-sections, Fig. 28f; masonry blocks, Fig. 28g; roof tiles, Fig. 28h; corrugated sheets, panels, facades, bearing walls, ceilings, Fig.28i; steps, Fig. 28j; helical shapes, Fig.28k; boxes of different configurations, Fig.281; railway sleepers.
  • Figs. 28a shows the examples of products that can be mass produced by manufacturers and precast industries.
  • Civil engineering examples are; Fig. 28a; pipes in standard diameters and lengths, Fig.28b; culverts and channels, Fig.
  • 29a to 29j show the examples of products that can be produced on-site by builders and contractors.
  • Mining industry examples are; Fig. 29a; arches and linings .for tunnels.
  • Civil engineering examples are; Fig. 29b; pipes laid in trenches continuously, Fig. 29c; culverts and channels (lean concrete extruded under slab as slab is extruded), Fig. 29d; manholes, Fig. 29e; tank farms.
  • Building industries examples are; Fig. 29f; roof tiles in strips or in one piece, Fig. 29g; roof ceilings, Fig. 29h; domes, Fig. 29i; columns, walls (straight and curved), fences, Fig. 29j; ground slabs.
  • extrusion machine 1, 23, 30, and 50 described above may be manufactured in any size so as to suit the particular product which is to be extruded. Machines could be manufactured to carry out in-situ extrusion. An example of the use of such a device is in multi-storey building construction where concrete can be pumped to the particular floor under construction. Extrusion machines are capable of extruding floors, walls, domes and the like.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Abstract

La présente invention concerne le moulage de béton en continu par extrusion; elle décrit en particulier le processus, le procédé et l'appareil avec lesquels des longueurs continues de produits en béton armé ou précontraint moulé ou d'autres produits composés de matériaux différents, peuvent être extrudés. La pression utilisée dans le processus d'extrusion peut apporter des effets avantageux provenant du réglage et du durcissement du béton plus rapide sous haute pression, de l'élimination de l'eau du mélange dans les surfaces poreuses du moule et de l'introduction des armatures. Des combinaisons judicieuses de lubrification de surface avec les pressions d'entraînement peuvent amener une précontrainte longitudinale des armatures. Des produits composés multi-couches peuvent aussi être extrudés. Les produits peuvent être plats ou posséder des formes symétriques par rapport à l'axe, en trois dimensions avec des courbures simple ou double ainsi que d'autres formes plus complexes en trois dimensions telles que la forme d'une hélice. Le résultat du processus peut être constitué d'éléments continus ou distincts.
PCT/AU1993/000158 1992-04-14 1993-04-13 Procede de moulage de beton en continu par extrusion WO1993020990A1 (fr)

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AUPL1900 1992-04-14
AUPL190092 1992-04-14

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657258A1 (fr) * 1993-12-08 1995-06-14 Stahlton AG Procédé pour la fabrication d'éléments de construction, en particulier à partir de matières minérales renforcées de fibres
WO1996010477A1 (fr) * 1994-10-04 1996-04-11 E. Khashoggi Industries Introduction de filaments dans des compositons extrudees durcissant a l'eau
US5545297A (en) * 1992-08-11 1996-08-13 E. Khashoggi Industries Methods for continuously placing filaments within hydraulically settable compositions being extruded into articles of manufacture
US5549859A (en) * 1992-08-11 1996-08-27 E. Khashoggi Industries Methods for the extrusion of novel, highly plastic and moldable hydraulically settable compositions
EP0771627A1 (fr) 1995-11-02 1997-05-07 Streek Holding B.V. Méthode et dispositif pour la fabrication d'un article de forme allongée à partir d'un matériau durcissable
US6398998B1 (en) 1994-07-08 2002-06-04 3H Inventors Aps Method for producing bodies of consolidated particulate material
WO2007065668A1 (fr) * 2005-12-09 2007-06-14 Italcementi S.P.A. Procede de production et de conservation de la forme d'un produit extrude constitue d'un materiau cimentaire
US8070997B2 (en) * 2005-12-09 2011-12-06 Italcementi S.P.A. Process for the production of piping made of a cementitious material having a circular section
WO2012152256A1 (fr) * 2011-05-11 2012-11-15 Roland Hörnstein GmbH & Co. KG Caisson encastrable pour plates-formes de levage dans le sol
CN113043430A (zh) * 2021-01-28 2021-06-29 四川华磷科技有限公司 可挤出复合有加强丝的连续湿坯板的挤出方法及挤出设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4000964A (en) * 1964-01-22 1935-07-22 Spisoll Corporation Ltd Improvements in machines for forming hollow cored concrete products
GB1190153A (en) * 1968-05-21 1970-04-29 Sven Melker Nilsson A Method and Apparatus for the Manufacture of Elongate Concrete Objects
EP0002891A1 (fr) * 1977-12-02 1979-07-11 Union Carbide Corporation Procédé de formage de produits céramiques en utilisant un lubrifiant aqueux
AU2778284A (en) * 1983-05-09 1984-11-15 Oy Partek Ab Extrusion casting hollow slabs
EP0347092A2 (fr) * 1988-06-11 1989-12-20 Redland Roof Tiles Limited Procédé pour la fabrication d'éléments de construction en béton
GB2221646A (en) * 1988-07-06 1990-02-14 Ultra Span Employing an auxiliary auger in a concrete extrusion/slide casting machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4000964A (en) * 1964-01-22 1935-07-22 Spisoll Corporation Ltd Improvements in machines for forming hollow cored concrete products
GB1190153A (en) * 1968-05-21 1970-04-29 Sven Melker Nilsson A Method and Apparatus for the Manufacture of Elongate Concrete Objects
EP0002891A1 (fr) * 1977-12-02 1979-07-11 Union Carbide Corporation Procédé de formage de produits céramiques en utilisant un lubrifiant aqueux
AU2778284A (en) * 1983-05-09 1984-11-15 Oy Partek Ab Extrusion casting hollow slabs
EP0347092A2 (fr) * 1988-06-11 1989-12-20 Redland Roof Tiles Limited Procédé pour la fabrication d'éléments de construction en béton
GB2221646A (en) * 1988-07-06 1990-02-14 Ultra Span Employing an auxiliary auger in a concrete extrusion/slide casting machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5545297A (en) * 1992-08-11 1996-08-13 E. Khashoggi Industries Methods for continuously placing filaments within hydraulically settable compositions being extruded into articles of manufacture
US5549859A (en) * 1992-08-11 1996-08-27 E. Khashoggi Industries Methods for the extrusion of novel, highly plastic and moldable hydraulically settable compositions
US5798151A (en) * 1992-08-11 1998-08-25 E. Khashoggi Industries, Llc Hydraulically settable articles which include helically wound filaments
EP0657258A1 (fr) * 1993-12-08 1995-06-14 Stahlton AG Procédé pour la fabrication d'éléments de construction, en particulier à partir de matières minérales renforcées de fibres
US6398998B1 (en) 1994-07-08 2002-06-04 3H Inventors Aps Method for producing bodies of consolidated particulate material
WO1996010477A1 (fr) * 1994-10-04 1996-04-11 E. Khashoggi Industries Introduction de filaments dans des compositons extrudees durcissant a l'eau
EP0771627A1 (fr) 1995-11-02 1997-05-07 Streek Holding B.V. Méthode et dispositif pour la fabrication d'un article de forme allongée à partir d'un matériau durcissable
WO2007065668A1 (fr) * 2005-12-09 2007-06-14 Italcementi S.P.A. Procede de production et de conservation de la forme d'un produit extrude constitue d'un materiau cimentaire
US8070997B2 (en) * 2005-12-09 2011-12-06 Italcementi S.P.A. Process for the production of piping made of a cementitious material having a circular section
WO2012152256A1 (fr) * 2011-05-11 2012-11-15 Roland Hörnstein GmbH & Co. KG Caisson encastrable pour plates-formes de levage dans le sol
CN113043430A (zh) * 2021-01-28 2021-06-29 四川华磷科技有限公司 可挤出复合有加强丝的连续湿坯板的挤出方法及挤出设备

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