Method for the production of concrete pipes

Details Method for the production of concrete pipes Method for the production of concrete pipes

1989-09-11

1991-09-24

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264312, 264333, 425 94, 425 95, 425262, 425427, B28B 116, B28B 312, B28B 2126

Patent

active

050512234

ABSTRACT:
A concrete pipe is produced by introducing a wet concrete mass into a pipe form to produce a cylindrical mass having an inner wall, compacting the cylindrical concrete mass by applying pressing rollers to the inner wall, smoothing the inner wall of the compacted cylindrical concrete mass, and applying a liquid impregnation medium to the inner wall under pressure after the concrete mass has been compacted, the inner wall has been partially smoothed and the concrete mass is still damp. The pressure is sufficient to cause the impregnation medium to permeate the damp concrete mass to a depth of at least 10 mm.

REFERENCES:
patent: 1510117 (1924-09-01), Von Vass
patent: 1669768 (1928-05-01), Martin
patent: 1768451 (1930-06-01), Hume
patent: 1788748 (1931-01-01), Schutte
patent: 1838546 (1931-12-01), Halstead
patent: 1979655 (1934-11-01), Whiting
patent: 2533579 (1950-12-01), Gowing
patent: 3091013 (1963-05-01), Robinson
patent: 3217077 (1965-11-01), Cocke
patent: 3649727 (1972-03-01), Gauger
patent: 4079500 (1978-03-01), Tolliver
patent: 4340553 (1982-07-01), Fosse
patent: 4639342 (1987-01-01), Adly

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