Stressed hollow concrete cylinders

Details Stressed hollow concrete cylinders Stressed hollow concrete cylinders

1975-11-25

1977-08-23

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Anti-stick or adhesion preventing coating

138176, 264135, 264228, 264314, 425111, 52224, B28B 2312

Patent

active

040440885

ABSTRACT:
The production of a moulded stressed concrete pipe in which stressed coated tendons are completely embedded in the finished article. The pipe is moulded in at least one longitudinal segment joined only by helically concentrically positioned tendons. The cured segments are then expanded radially to stretch and stress the tendons, the gap formed between the segments being filled with filler material to maintain the stress in the tendons. There is also disclosed a method where the tendons are stressed on a former prior to immersion of the tendons and former in a concrete pour. The former is segmented and collapsible so that the tension in the tendons can be transferred from the former to the concrete when it has cured, thus forming a stressed pipe structure.

REFERENCES:
patent: 376748 (1888-01-01), Meehan
patent: 2185749 (1940-01-01), Kennedy
patent: 3390211 (1968-06-01), Ziegler

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