Importance

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Abstract

A column such as a concrete bridge or overpass column is reinforced by transverse post tensioning a steel wire around the length of the column. Apparatus for winding the wire around the column includes a first support frame which is attached to the column and a second support frame which is movably positioned around the column. The second support frame is movably supported on the first support frame whereby the second support frame can move axially along the length of the column. The second support frame includes a fixed inner ring, and a rotatable outer ring engages the inner ring in a tongue-in-groove fashion. The outer ring supports a spool of wire and a tensioning spool, and a drive motor and pinion mounted to the fixed inner ring drives the outer ring gear and rotates the spool of wire around the column as the second support frame is translated axially along a length of the column. The first support frame is repeatedly moved along the column until the full length of the column has been wound with wire.

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First Claim