Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Arched – domed – or vertical-cylindrical structure
Patent
1976-01-12
1978-02-21
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Forming structural installations in situ
Arched, domed, or vertical-cylindrical structure
61 722, 264 33, 264 34, 264 35, 264225, 425 59, B63B 3504
Patent
active
040753000
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: 2243273 (1941-05-01), Edwards
patent: 2816322 (1957-12-01), Bjorksten
patent: 3380259 (1968-04-01), Rubenstein
patent: 3773874 (1973-11-01), Long
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