EP0440591A2 - Method for producing a concrete pillar - Google Patents

Method for producing a concrete pillar Download PDF

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Publication number
EP0440591A2
EP0440591A2 EP91850017A EP91850017A EP0440591A2 EP 0440591 A2 EP0440591 A2 EP 0440591A2 EP 91850017 A EP91850017 A EP 91850017A EP 91850017 A EP91850017 A EP 91850017A EP 0440591 A2 EP0440591 A2 EP 0440591A2
Authority
EP
European Patent Office
Prior art keywords
concrete
concrete pillar
pillar
rotating shaft
frame structure
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.)
Withdrawn
Application number
EP91850017A
Other languages
German (de)
French (fr)
Other versions
EP0440591A3 (en
Inventor
Olli Virtanen
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 BETONILA Oy
Original Assignee
LOHJA BETONILA 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 BETONILA Oy filed Critical LOHJA BETONILA Oy
Publication of EP0440591A2 publication Critical patent/EP0440591A2/en
Publication of EP0440591A3 publication Critical patent/EP0440591A3/en
Withdrawn legal-status Critical Current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
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/92—Methods or apparatus for treating or reshaping
    • B28B21/96—Methods or apparatus for treating or reshaping for smoothing, roughening, corrugating or for removing burr
    • 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
    • B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
    • B28B1/32—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by projecting, e.g. spraying
    • 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
    • B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
    • B28B11/0845—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for smoothing
    • 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
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/42—Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces
    • B28B21/44—Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces by projecting, e.g. spraying

Definitions

  • the present invention concerns a method for producing a concrete pillar by way of shotcreting concrete onto an appropriately preshaped frame structure of the concrete pillar and rotating said frame structure on a rotating shaft attached to the frame structure simultaneously with the shotcreting, and finally, shaping said shotcreted concrete surface after shotcreting with the help of, e.g., a collar of desired shape.
  • a method resembling that described above is disclosed in the DE patent 435567, said patent being based on shotcreting with concrete onto a mould of predetermined shape, and then smoothing the fresh shotcreted surface; in this case with the help of a tensioned wire.
  • the concrete pillar is allowed to harden, after which it is removed from the support base and the rotating shaft.
  • the concrete pillar is ready after these operations. If a further treatment of the concrete pillar surface is desirable in order to achieve, e.g., better smoothness, this is performed using manual grinding tools. Such a working method is very cumbersome and time-consuming.
  • the production method in accordance with the invention is characterized in that the concrete pillar is allowed to harden while being attached to the rotating shaft, and after hardening, the surface of the pillar is ground with a grinding apparatus, and the concrete pillar is rotated on its rotating shaft either in the same rotating equipment in which the concrete pillars are shotcreted, or alternatively, in a separate grinding apparatus.
  • the grinding operation is reduced to a minimum and the centering of the pillar is easy in case it is transferred to a separate grinding apparatus.
  • a correctly dimensioned product is achieved with no need for posttreatment of its surface.
  • An embodiment of the invention is characterized in that the concrete pillar is continuously rotated with a simultaneous grinding of its surface with the help of, e.g., a high-RPM grinding disc.
  • the grinding disc is therein moved only along a vertically aligned track, whereby the surface of the concrete pillar rotating on its axis becomes ground.
  • Another embodiment of the invention is characterized in that the concrete pillar is rotated cyclically intermittently, and the surface of the concrete pillar is ground by one long side at a time using, e.g. a high-RPM grinding disc.
  • pillars with angled and more complex cross-sectional shapes can be ground.
  • a further another embodiment of the invention is characterized in that, after grinding, the concrete pillar is cut off from the rotating shaft.
  • a long concrete pillar can directly be trimmed into concrete pillar products of desired length which need no further posttreatment.
  • a shotcreting equipment 1 is used to apply concrete onto an appropriately shaped frame structure of the concrete pillar.
  • the frame structure is not shown in the diagrams, but it can be a preformed sheet metal tube, preshaped fabric or even a combination of these two.
  • the frame structure is rotated on a rotating shaft 2 attached to the frame structure.
  • the frame structure is shotcreted, typically starting from below upward.
  • the shotcreted surface is shaped with the help of a collar 4 by moving it upward along the concrete pillar and then back to its lower position.
  • the concrete pillar is allowed to harden while being attached to the rotating shaft 2, either in the above-described shotcreting apparatus, or alternatively, in a separate location reserved for hardening.
  • the surface of the concrete pillar is ground by rotating the pillar on the shaft 2, simultaneously grinding its surface by means of a grinding apparatus 5 having a high-RPM grinding disc 6 attached to it. The grinding operation is performed from up downwards as indicated by the arrow.
  • the concrete pillar is cut off from its rotating shaft 2. While the concrete pillar shown in the example has a circular cross section, angled and even more complex cross-sectional shapes are equally possible. The surface can also be decoratively ground into different kinds of patterns.

Abstract

The invention concerns a method for producing a concrete pillar, said method being based on the shotcreting of an appropriately shaped frame structure of the concrete pillar with concrete, and said frame structure is simultaneously rotated on a rotating shaft (2) attached to the frame structure while being shotcreted with concrete, and said shotcreted concrete surface is shaped after shotcreting with the help of, e.g., a collar (4) having a desired shape. The concrete pillar is allowed to harden while being attached to the rotating shaft (2), and after hardening, the surface of the concrete pillar is ground with a grinding apparatus (5), and the concrete pillar is rotated on its rotating shaft either in the same rotating equipment in which the concrete pillars are shotcreted, or alternatively, in a separate grinding apparatus.

Description

  • The present invention concerns a method for producing a concrete pillar by way of shotcreting concrete onto an appropriately preshaped frame structure of the concrete pillar and rotating said frame structure on a rotating shaft attached to the frame structure simultaneously with the shotcreting, and finally, shaping said shotcreted concrete surface after shotcreting with the help of, e.g., a collar of desired shape.
  • A method resembling that described above is disclosed in the DE patent 435567, said patent being based on shotcreting with concrete onto a mould of predetermined shape, and then smoothing the fresh shotcreted surface; in this case with the help of a tensioned wire. Next, the concrete pillar is allowed to harden, after which it is removed from the support base and the rotating shaft. The concrete pillar is ready after these operations. If a further treatment of the concrete pillar surface is desirable in order to achieve, e.g., better smoothness, this is performed using manual grinding tools. Such a working method is very cumbersome and time-consuming.
  • It is an object of the present invention to overcome the above-described drawback by way of a novel production method. The production method in accordance with the invention is characterized in that the concrete pillar is allowed to harden while being attached to the rotating shaft, and after hardening, the surface of the pillar is ground with a grinding apparatus, and the concrete pillar is rotated on its rotating shaft either in the same rotating equipment in which the concrete pillars are shotcreted, or alternatively, in a separate grinding apparatus. By virtue of the invention, the grinding operation is reduced to a minimum and the centering of the pillar is easy in case it is transferred to a separate grinding apparatus. Thus, a correctly dimensioned product is achieved with no need for posttreatment of its surface.
  • An embodiment of the invention is characterized in that the concrete pillar is continuously rotated with a simultaneous grinding of its surface with the help of, e.g., a high-RPM grinding disc. The grinding disc is therein moved only along a vertically aligned track, whereby the surface of the concrete pillar rotating on its axis becomes ground.
  • Another embodiment of the invention is characterized in that the concrete pillar is rotated cyclically intermittently, and the surface of the concrete pillar is ground by one long side at a time using, e.g. a high-RPM grinding disc. Thus, pillars with angled and more complex cross-sectional shapes can be ground.
  • A further another embodiment of the invention is characterized in that, after grinding, the concrete pillar is cut off from the rotating shaft. Thus, a long concrete pillar can directly be trimmed into concrete pillar products of desired length which need no further posttreatment.
  • In the following the invention is described in more detail with reference to the attached drawing that illustrates an apparatus suitable for use in the production method of a concrete pillar.
  • According to the method for production of a concrete pillar, a shotcreting equipment 1 is used to apply concrete onto an appropriately shaped frame structure of the concrete pillar. The frame structure is not shown in the diagrams, but it can be a preformed sheet metal tube, preshaped fabric or even a combination of these two. Using a drive means 3, the frame structure is rotated on a rotating shaft 2 attached to the frame structure. Simultaneously with the rotation, the frame structure is shotcreted, typically starting from below upward. The shotcreted surface is shaped with the help of a collar 4 by moving it upward along the concrete pillar and then back to its lower position. Next, the concrete pillar is allowed to harden while being attached to the rotating shaft 2, either in the above-described shotcreting apparatus, or alternatively, in a separate location reserved for hardening. After hardening, the surface of the concrete pillar is ground by rotating the pillar on the shaft 2, simultaneously grinding its surface by means of a grinding apparatus 5 having a high-RPM grinding disc 6 attached to it. The grinding operation is performed from up downwards as indicated by the arrow. Next, the concrete pillar is cut off from its rotating shaft 2. While the concrete pillar shown in the example has a circular cross section, angled and even more complex cross-sectional shapes are equally possible. The surface can also be decoratively ground into different kinds of patterns.

Claims (4)

  1. A method for producing a concrete pillar, said method being based on the shotcreting of an appropriately shaped frame structure of the concrete pillar with concrete, and said frame structure is simultaneously rotated on a rotating shaft (2) attached to the frame structure while being shotcreted with concrete, and said shotcreted concrete surface is shaped after shotcreting with the help of, e.g., a collar (4) having a desired shape, characterized in that the concrete pillar is allowed to harden while being attached to the rotating shaft (2), and after hardening, the surface of the concrete pillar is ground with a grinding apparatus (5), and the concrete pillar is rotated on its rotating shaft either in the same rotating equipment in which the concrete pillars are shotcreted, or alternatively, in a separate grinding apparatus.
  2. A method for producing a concrete pillar as claimed in claim 1, characterized in that the concrete pillar is continuously rotated with a simultaneous grinding of its surface with the help of, e.g., a high-RPM grinding disc (6).
  3. A method for producing a concrete pillar as claimed in claim 1, characterized in that the concrete pillar is rotated cyclically intermittently, and the surface of the concrete pillar is ground by one long side at a time using, e.g. a high-RPM grinding disc (6).
  4. A method for producing a concrete pillar as claimed in any of the foregoing claims, characterized in that, after grinding, the concrete pillar is cut off from the rotating shaft (2).
EP19910850017 1990-02-02 1991-01-30 Method for producing a concrete pillar Withdrawn EP0440591A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI900548A FI90842C (en) 1990-02-02 1990-02-02 Method of manufacturing a concrete pillar
FI900548 1990-02-02

Publications (2)

Publication Number Publication Date
EP0440591A2 true EP0440591A2 (en) 1991-08-07
EP0440591A3 EP0440591A3 (en) 1992-05-20

Family

ID=8529827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910850017 Withdrawn EP0440591A3 (en) 1990-02-02 1991-01-30 Method for producing a concrete pillar

Country Status (2)

Country Link
EP (1) EP0440591A3 (en)
FI (1) FI90842C (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0557262A1 (en) * 1992-02-21 1993-08-25 Partek Concrete Oy Ab Casting mold for a concrete column or beam
EP0557261A1 (en) * 1992-02-21 1993-08-25 Partek Concrete Oy Ab Apparatus for the manufacture of concrete columns
FR2689551A1 (en) * 1992-04-07 1993-10-08 Harnois Georges Method for making closed or open premises, constituting spaces annexed to a main house.
EP1724081A1 (en) * 2005-05-19 2006-11-22 Quadra 1 Device for material removal from construction elements
CN105881701A (en) * 2016-03-18 2016-08-24 福建首聪世豪实业有限公司 Spraying type pipeline manufacturing equipment
CN110860971A (en) * 2019-11-29 2020-03-06 福建省佳美集团公司 Automatic blank grinding machine for ceramics
WO2023193519A1 (en) * 2022-04-08 2023-10-12 福建省佳美集团公司 Automatic ceramic blank finishing and polishing apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105083B (en) * 1998-08-03 2000-06-15 Pertti Juhani Kukkonen Procedure for grinding a round pillar

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE132697C (en) *
US1849626A (en) * 1926-10-01 1932-03-15 Ver Stahlwerke Ag Machine for automatically shaping stones and the like
GB447357A (en) * 1935-08-06 1936-05-18 James Duncan Hall Apparatus for moulding pipes, pillars and other cylindrical forms in plastic materials
FR1355696A (en) * 1963-02-05 1964-03-20 Merlin Gerin Process and machine for machining hollow insulators
EP0340185A2 (en) * 1988-04-28 1989-11-02 Betemi Oy Production method for a concrete pillar or beam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE132697C (en) *
US1849626A (en) * 1926-10-01 1932-03-15 Ver Stahlwerke Ag Machine for automatically shaping stones and the like
GB447357A (en) * 1935-08-06 1936-05-18 James Duncan Hall Apparatus for moulding pipes, pillars and other cylindrical forms in plastic materials
FR1355696A (en) * 1963-02-05 1964-03-20 Merlin Gerin Process and machine for machining hollow insulators
EP0340185A2 (en) * 1988-04-28 1989-11-02 Betemi Oy Production method for a concrete pillar or beam

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0557262A1 (en) * 1992-02-21 1993-08-25 Partek Concrete Oy Ab Casting mold for a concrete column or beam
EP0557261A1 (en) * 1992-02-21 1993-08-25 Partek Concrete Oy Ab Apparatus for the manufacture of concrete columns
FR2689551A1 (en) * 1992-04-07 1993-10-08 Harnois Georges Method for making closed or open premises, constituting spaces annexed to a main house.
EP1724081A1 (en) * 2005-05-19 2006-11-22 Quadra 1 Device for material removal from construction elements
CN105881701A (en) * 2016-03-18 2016-08-24 福建首聪世豪实业有限公司 Spraying type pipeline manufacturing equipment
CN105881795A (en) * 2016-03-18 2016-08-24 福建首聪世豪实业有限公司 Spraying type pipe making device
CN105881701B (en) * 2016-03-18 2018-11-13 福建首聪世豪实业有限公司 Jet printing type pipeline manufacturing equipment
CN110860971A (en) * 2019-11-29 2020-03-06 福建省佳美集团公司 Automatic blank grinding machine for ceramics
CN110860971B (en) * 2019-11-29 2021-10-15 福建省佳美集团公司 Automatic blank grinding machine for ceramics
WO2023193519A1 (en) * 2022-04-08 2023-10-12 福建省佳美集团公司 Automatic ceramic blank finishing and polishing apparatus

Also Published As

Publication number Publication date
FI900548A (en) 1991-08-03
FI90842B (en) 1993-12-31
EP0440591A3 (en) 1992-05-20
FI90842C (en) 1994-04-11
FI900548A0 (en) 1990-02-02

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