Christie, Parker & Hale
Anchoring system for prestressed concrete pipe
 Multilayers of high tensile strength wire are wound in tension around a tubular concrete core, and anchored to place the pipe in radial compression. The first layer of wire wrapped around the pipe is secured at its opposite end by a first anchoring system, and is coated with mortar. Each successive layer of wire wrapped around the pipe is secured to its opposite ends by respective separate anchors, and is covered by a respective coating of mortar. Each anchoring system after the first includes an insert block in an embedment anchor for supporting a separate anchor block for each layer of wire at a level different from that of the preceding layers of wire. Each insert block is contacted by the first wire to hold the insert blocks in place, and to provide electrical continuity for cathodic protection, when required. 
Ameron, Inc.
E F E E
E04C F16L E04G E04G
inventional inventional additional inventional
Harry H.
Robertson