Process of and apparatus for forming concrete pipe with step

(19)

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EP 0 429 389 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.11.1991 Bulletin 1991/45

(43)	Date of publication A2:
	29.05.1991 Bulletin 1991/22

(21)	Application number: 90610069.8

(22)	Date of filing: 20.11.1990

(51)	International Patent Classification (IPC)⁵: B28B 23/00, B28B 21/76

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU NL SE

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Priority:

20.11.1989 JP 300998/89
09.07.1990 JP 180800/90

(71)	Applicant: SAKURAI KENZAI SANGYO KABUSHIKI KAISHA
	Shizuoka-shi, Shizuoka-ken (JP)

(72)	Inventor:
	Kodama, Shigeo Shizuoka-shi, Shizuoka-ken (JP)

(74)	Representative: Holme, Edvard et al
	c/o Hofman-Bang & Boutard A/S Adelgade 15 DK-1304 Copenhagen K DK-1304 Copenhagen K (DK)

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References cited: :

(54)	Process of and apparatus for forming concrete pipe with step

(57) A pallet (15) is connected to a lower end of an outer mold jacket (13) and a core segment (8) to which a step member (27) is attached is removably attached to the pallet (15), and then stiff consistency concrete material is thrown into a forming spacing (19) defined between an inner mold core (1) and the outer mold jacket (13) and is then compacted, whereafter the outer mold jacket (13) and the pallet (15) are lifted to remove a thus formed concrete pipe, and then the core segment (8) is removed from the pallet (15) to separate the same from the step member (27).
With the process, an attaching operation of the step member to the core segment and a separating operation of the core segment from the step member after removal of the product can be performed outside the inner mold core. Further, the step member can be retained by the core segment at a location at which it is to be attached until the formed concrete pipe is hardened thoroughly.

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