Conduit making method

Details Conduit making method Conduit making method

1978-05-16

1980-11-25

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

264162, 264173, 264228, 264259, 264267, 264310, 264333, B28B 108, B29C 2300, B29D 302, B28B 128

Patent

active

042358310

ABSTRACT:
This invention relates to a method for making concrete conduit. The method of this invention pertains to forming a conduit mat of material on a form, advancing the formed conduit mat of material from the form, fastening the conduit mat together, cutting the conduit into desired lengths, applying concrete on the conduit mat, working the concrete from both the inside and outside of the conduit mat to form smooth surfaces on both surfaces of the concreted conduit mat and curing the concreted conduit mat to form concrete conduit. In one embodiment of this invention, the method is performed from a mobile base which moves forward as the concrete conduit is continuously made and layed on the ground or underwater.

REFERENCES:
patent: 2963765 (1960-12-01), Tillman
patent: 3055073 (1962-09-01), Gerwick
patent: 3086509 (1963-04-01), Henley
patent: 3146508 (1964-09-01), Berliner et al.
patent: 3276092 (1966-10-01), Pankow
patent: 3293963 (1966-12-01), Carroll et al.
patent: 3392222 (1968-09-01), Cordon
patent: 3520749 (1970-07-01), Rubenstein
patent: 3691992 (1972-09-01), Beemer
patent: 3733939 (1973-05-01), Paysinger et al.
patent: 3740291 (1973-06-01), Mallard
patent: 3761557 (1973-09-01), Werner
patent: 3901963 (1975-09-01), Werner
patent: 4033387 (1977-07-01), Nijs et al.

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