Prestressed Concrete Cylinder Pipe

American Concrete Pressure Pipe Association Concrete Cylinder Pipe has the following two general types of construction: (1) a steel cylinder with a concrete core (Lined-Cylinder Pipe), or (2) a steel cylinder embedded in a concrete core (Embedded-Cylinder Pipe). In either type of construction, manufacturing begins with a full-length welded steel cylinder. Joint rings are attached to each end, and the cylinder assembly is hydrostatically tested to ensure watertightness. A concrete core is placed by the centrifugal process, radial compaction, or by vertical casting. After the core is cured, the pipe is helically wrapped with high-strength wire. The wire spacing is accurately controlled to produce a predetermined residual compression in the concrete core. The wire is sprayed with a thick cement slurry and coated with a cement-rich dense mortar coating.

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