EP0376353B1 - A method and device for casting concrete products - Google Patents

A method and device for casting concrete products Download PDF

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Publication number
EP0376353B1
EP0376353B1 EP89124153A EP89124153A EP0376353B1 EP 0376353 B1 EP0376353 B1 EP 0376353B1 EP 89124153 A EP89124153 A EP 89124153A EP 89124153 A EP89124153 A EP 89124153A EP 0376353 B1 EP0376353 B1 EP 0376353B1
Authority
EP
European Patent Office
Prior art keywords
mould
concrete
compaction
fed
tank
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
EP89124153A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0376353A1 (en
Inventor
Paavo Ojanen
Antero Kajava
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.)
LOHJA PARMA ENGINEERING LPE OY
Original Assignee
LOHJA PARMA ENGINEERING LPE Oy
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 LOHJA PARMA ENGINEERING LPE Oy filed Critical LOHJA PARMA ENGINEERING LPE Oy
Priority to AT89124153T priority Critical patent/ATE88407T1/de
Publication of EP0376353A1 publication Critical patent/EP0376353A1/en
Application granted granted Critical
Publication of EP0376353B1 publication Critical patent/EP0376353B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/021—Feeding the unshaped material to moulds or apparatus for producing shaped articles by fluid pressure acting directly on the material, e.g. using vacuum, air pressure
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping

Definitions

  • This invention relates to a method for casting concrete products.
  • the invention is also concerned with a device for casting concrete products.
  • Prior art techniques for the production of elongated concrete products include slip casting in which a casting machine feeds concrete into a mould while moving on rails along the mould from its one end to the other.
  • the casting machine is positioned above the mould, so that the concrete flows into the mould under the influence of the force of gravity.
  • the concrete fed into the mould is compacted by means of vibrators to remove air bubbles from it.
  • the vibrators may be connected to the casting machine or they may be mounted fixedly in the mould.
  • FR-A-2 405 796 discloses a method and an apparatus for mixing and agitating particles of different components for producing a mineral composition. Said particles are treated by a mill 6 comprising a vibrator. The thus treated mixture is fed to an agitator where it is mixed with water and other fluid components. The vibrator serves for milling only.
  • US-A-2 429 012 shows an apparatus and a method for producing hollow piles in which concrete is pumped upwardly into a core 27 being part of the respective mould.
  • the object underlying the present invention is to provide a method of and a device for, respectively, casting concrete products, allowing rapid casting and providing high-quality products with good strength properties.
  • the casting method of the invention is more rapid than prior art methods due to the fact that the compaction of the concrete to be cast into the mould is carried out before the casting step.
  • the products produced by means of the method are of excellent quality. This is partly due to the fact that the concrete compaction is carried out before the casting as a separate step, wherefore the compaction takes place under controlled conditions, which in turn, enables sampling, for instance.
  • the quality of the products is also affected by the way in which the concrete is fed into the mould. In the invention the concrete is fed in such a way that gas bubbles and boundaries will not be formed within it.
  • the method of the invention is especially suited for the production of long, prestressed concrete products, such as concrete rods containing prestressed irons, disclosed in FI 881843.
  • a simple way of providing a continous flow is to create a counter-pressure in the mould and feed the concrete longitudinally of the mould.
  • Boundaries and gas bubbles will not be formed in the concrete during casting when the concrete is fed into the mould through its one end.
  • the mould is kept in a vertical or slanted position during the casting, the concrete being fed into the mould through its lower end and moved on the mould against the force of gravity. Since the concrete is moved on against the force of gravity, it remains compact throughout the casting process, and no interruptions occur in the flow.
  • the concrete is pumped from the compaction means into the mould.
  • the concrete compaction means are formed by a tank, and a vibrator and means for creating an overpressure and/or underpressure in the tank are connected to the tank.
  • a tank comprises means for creating an underpressure in the tank.
  • the concrete material can be advantageously fed from the tank into the mould with means creating an overpressure in the tank, the concrete material being forced into the mould by means of this overpressure.
  • Another alternative suited for the method of the invention is to pass the concrete material from the tank to the mould by means of a pump.
  • the mould In order to ensure that the concrete material fed into the mould remains compacted, it is important to position the mould horizontally, vertically or in a slanted position. In the two last-mentioned cases, the mould is closed, the concrete inlet being positioned at the lower end of the mould.
  • Figure 1 shows the principal parts of a casting device, viz, a mould 1; means 2 for feeding concrete material into the mould; and means 3 for compacting the concrete material.
  • the parts 1 to 3 communicate with each other by means of conduits 4 and 5.
  • the concrete feeding means comprise a pump 2
  • the compaction means comprise a compaction tank 3.
  • the compaction tank 3 is connected by means of the conduit 4 before the pump 2 in the direction of movement of the concrete, and the pump 2 is connected by means of the conduit 5 to one end of the mould 1.
  • the mould is elongated, closed and vertically positioned, and the conduit 5 is connected to its lower end.
  • a filling opening is provided at the top of the compaction tank 3.
  • the opening can be closed by means of a lid 6.
  • a gas removal connection 7 is provided at the top of the tank.
  • At least one vibrator 8 is provided in the bottom portion of the tank, and a closing connection 9 connected to the conduit 4 is provided in the bottom of the tank.
  • a connection between the conduit 4 and the pump is indicated with the reference numeral 10, and a pump feed pipe connected to the conduit 5 is indicated with the reference 11.
  • the casting of the concrete product is carried out by first compacting the concrete in the tank 3 and subsequently pumping it into the mould 1 so that it moves on in the mould as a continuous flow.
  • the casting method of the invention is considerably more rapid than prior art production techniques, because instead of moving the casting device itself the concrete flows from the tank into the mould.
  • the method of the invention can be used both in connection with a closed and open mould.
  • Figures 2 and 3 show another embodiment of the device, in which the mould 1 is, for instance, rectangular, horizontal and open at the top, being intended for the production of a concrete slab, for instance.
  • the conduit 5 feeds concrete from above into the mould.
  • a counterpressure has to be created in the mould.
  • the counterpressure is created by means of a horizontal plate 12 surrounding the opening of the conduit 5.
  • the plate 12 and the bottom and sides of the mould define a substantially closed space which prevents the concrete from falling freely into the mould.
  • the conduit 5 and the plate 12 are displaced horizontally along the mould along parallel paths so that the slab is formed by concrete zones 13 positioned side by side. To provide the slab with a smooth surface, it is to be preferred that the plate 12 rotates or oscillates.
  • the invention can be realized without the pump 2.
  • the compaction tank is thereby provided with a connection through which pressurized gas can be introduced into the tank to feed compacted concrete directly into the mould.
  • the mould is elongated and vertically positioned, and the conduit 5 opens in the lower end of the mould.
  • the mould can be slanted or horizontally positioned, whereby the concrete inlet need not necessarily be positioned at the end of the mould.
  • a force resisting the feeding of the concrete can be alternatively effected by forming an overpressure in a closed mould before the filling of the mould.
  • the simplest way, however, is to utilize the force of gravity as a counter force. If regarded necessary, the concrete can, of course, be subjected to additional compaction in a conventional manner after having been cast into the mould.
  • Additional compaction can be alternatively effected by exposing the concrete to a pressure by creating an overpressure in the mould.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (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)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP89124153A 1988-12-30 1989-12-29 A method and device for casting concrete products Expired - Lifetime EP0376353B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89124153T ATE88407T1 (de) 1988-12-30 1989-12-29 Verfahren und vorrichtung zum giessen von betonkoerpern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI886043A FI886043A (fi) 1988-12-30 1988-12-30 Foerfarande och anordning gjutning av betongprodukter.
FI886043 1988-12-30

Publications (2)

Publication Number Publication Date
EP0376353A1 EP0376353A1 (en) 1990-07-04
EP0376353B1 true EP0376353B1 (en) 1993-04-21

Family

ID=8527652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89124153A Expired - Lifetime EP0376353B1 (en) 1988-12-30 1989-12-29 A method and device for casting concrete products

Country Status (8)

Country Link
EP (1) EP0376353B1 (es)
AT (1) ATE88407T1 (es)
CA (1) CA2006901A1 (es)
DE (1) DE68906139T2 (es)
DK (1) DK670889A (es)
ES (1) ES2039829T3 (es)
FI (1) FI886043A (es)
NO (1) NO895290L (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056135A1 (en) * 2001-12-21 2003-07-10 Gordon Cowan Support apparatus and apparatus for producing concrete articles
DE10348508A1 (de) * 2003-10-18 2005-06-09 Hauser, Stephan, Dr.-Ing. Mobiler Munitionsbehälter
DE102017106905A1 (de) * 2017-03-30 2018-10-04 Johann Bartlechner Kg System und Verfahren zum Herstellen eines Betonformteils

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH153368A (de) * 1930-09-26 1932-03-15 Ruml Bohuslav Vorrichtung zur Erzeugung von Hohlkörpern aller Art aus Beton, Eisenbeton, Asbestzement und dergleichen.
US2429012A (en) * 1946-02-12 1947-10-14 Clarence E Zigenbein Apparatus and method for producing hollow piles
DE2827912A1 (de) * 1977-10-13 1979-04-19 Simmering Graz Pauker Ag Verfahren und vorrichtung zur herstellung aktivierter gemische mineralischer komponenten

Also Published As

Publication number Publication date
DE68906139T2 (de) 1993-08-05
DE68906139D1 (de) 1993-05-27
DK670889A (da) 1990-07-01
DK670889D0 (da) 1989-12-28
EP0376353A1 (en) 1990-07-04
ES2039829T3 (es) 1993-10-01
NO895290L (no) 1990-07-02
FI886043A (fi) 1990-07-01
NO895290D0 (no) 1989-12-28
CA2006901A1 (en) 1990-06-30
ATE88407T1 (de) 1993-05-15

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