(19)
(11) EP 0 440 591 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.05.1992 Bulletin 1992/21

(43) Date of publication A2:
07.08.1991 Bulletin 1991/32

(21) Application number: 91850017.4

(22) Date of filing: 30.01.1991
(51) International Patent Classification (IPC)5B28B 21/96, B28B 21/44, B28B 1/32, B28B 11/08
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 02.02.1990 FI 900548

(71) Applicant: LOHJA BETONILA OY
SF-03100 Nummela (FI)

(72) Inventor:
  • Virtanen, Olli
    SF-21600 Parainen (FI)

(74) Representative: Roth, Ernst Adolf Michael et al
GÖTEBORGS PATENTBYRA AB Box 5005
S-402 21 Göteborg
S-402 21 Göteborg (SE)


(56) References cited: : 
   
       


    (54) Method for producing a concrete pillar


    (57) 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.





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