Method of forming the primary core of a prestressed concrete pip

Details Method of forming the primary core of a prestressed concrete pip Method of forming the primary core of a prestressed concrete pip

1983-01-10

1986-07-15

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

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

By reciprocating or vibrating mold

264261, 264269, 2642711, 264254, 264256, 264312, 264333, B28B 110, B29C 3912

Patent

active

046005480

ABSTRACT:
The present invention relates to a method of forming the primary core of a concrete pipe. A steel cylinder is disposed vertically on the base of the pipe forming machine. A conventional rotary packerhead having a diameter less than the inner diameter of the steel cylinder is lowered concentrically to the bottom thereof. Concrete is then introduced within the steel cylinder through the upper end thereof. The packerhead is rotated to force the concrete into the annular gap between the packerhead and the steel cylinder. As the primary core is formed, the packerhead is raised and rotated while concrete is introduced within the steel cylinder, thereby forming a primary core consisting of a steel cylinder having an inner lining of concrete. In an alternative embodiment, the steel cylinder is completely embedded within the concrete.

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Lea et al., The Chemistry of Concrete, Arnold London (1956) p. 153.

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