Method of forming lined pipe

Details Method of forming lined pipe Method of forming lined pipe

1989-07-11

1991-07-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

249 93, 249179, 264 71, 264278, 264313, 425111, 425125, B28B 108, B28B 730

Patent

active

050283685

ABSTRACT:
A method for making concrete pipe. Vinyl liners are held by an expandable liner carrying device. The carrying device is expanded so as to hold the liner in engagement with the outer surface, forming a liner/carrier assembly. Concrete reinforcing bars are placed around the liner/carrier assembly. The liner/carrier assembly and reinforcing bars are surrounded by a dry-cast concrete form. Then, the form is placed on a forming module, and the module is actuated into engagement with the inside surface of the core forcing the liner/carrier assembly to assume a predetermined, usually cylindrical, shape. The form is filled and immediately taken off of the module. The form is immediately stripped, but the core, held immobile by the dry cast concrete, which sets quickly, continues to hold the liner in engagement with the concrete until a complete bond is established. Finally, the core is retracted from engagement with the liner and removed from the finished lined pipe.

REFERENCES:
patent: 2387815 (1945-10-01), Troiel
patent: 2747249 (1956-05-01), Chiverton
patent: 3107158 (1963-10-01), Ahlberg
patent: 3656732 (1972-04-01), St. John
patent: 4039642 (1977-08-01), Steiro
patent: 4119695 (1978-10-01), Asserback
patent: 4153232 (1979-05-01), Burchett
patent: 4578235 (1986-03-01), Schmidgall et al.
patent: 4582275 (1986-04-01), Ives

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