Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1978-02-07
1979-12-11
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
249143, 249144, 264 72, 264336, 425432, B28B 108
Patent
active
041783387
ABSTRACT:
In a method of casting in a horizontal mould a hollow, reinforced tapering concrete post having a thin wall and particularly a length exceeding 10 to 15 m, there is placed in the mould a tapering reinforcing cage or basket in which a core, e.g. a steel core, is inserted to form a substantially annular mould chamber. Said mould chamber is closed with the exception of an upper filling slot. A readily pourable concrete mass is charged to the mould from above through said filling slot. The mould is then vibrated without being rotated such that concrete fills the annular mould chamber. Hardening of the concrete is accelerated by heating, and the core is withdrawn from the formed post before the concrete has completely hardened. The finished post is then removed from the mould. The concrete mixture used shall have a settling or slump measurement of between 1 and 5 cm prior to charging a flow-promoting agent, and a settling or slump measurement of between 12 and 14 cm subsequent to charging said flow-promoting agent. The concrete mixture has a stone size of at the most 8 mm. The core is preferably withdrawn 1.5 to 4 hours after completion of the casting operation.
The invention also concerns a mould for casting concrete posts of the above mentioned kind.
REFERENCES:
patent: 1593696 (1926-07-01), Hyden
patent: 2356852 (1944-08-01), Hutchinson
patent: 2794231 (1957-06-01), Lloyd
patent: 3260494 (1966-07-01), Deigaard
patent: 3933969 (1976-01-01), Robinson
patent: 4039642 (1977-08-01), Steiro
Bondpers Per-Erik
Liljegren Gote
A-Betong AB
Pavelko Thomas P.
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