Apparatus for producing cast-in-place pipe employing permanent p

Details Apparatus for producing cast-in-place pipe employing permanent p Apparatus for producing cast-in-place pipe employing permanent p

1978-01-23

1979-05-08

McQuade, John

Plastic article or earthenware shaping or treating: apparatus

Utilizing subterranean feature as shaping means

425 64, 425 89, 425122, 425130, B28B 2106

Patent

active

041533984

ABSTRACT:
Continuous concrete pipe is produced in an open trench by drawing a sled along the trench. The sled has a fresh concrete intake chute which supplies the concrete to a pipe-forming mechanism that generates the pipe. The lower pipe half is supported by the trench. To support the upper pipe half, a plastic material is given a convex shape complementary to the concave interior of the pipe. The plastic material is formed over a convex mandrel carried by the sled forward (in the direction of movement of the sled) of the intake means so that the plastic material hardens before contacted by wet concrete from the intake means. The mandrel extends rearwardly past the intake means to provide support for the plastic mold while the pipe is formed. Alternative ways for making the plastic mold are described.

REFERENCES:
patent: 3380259 (1968-04-01), Rubenstein
patent: 3583046 (1971-06-01), Dickinson et al.
patent: 4017226 (1977-04-01), Long

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