Abstract
This document presents a unique and cost saving solution that was developed and installed to address extremely corroded steel grillage foundations supporting a 3 tower angle structure on a critical Southern Company 230kV line in south Alabama. Description of Problem In July of 2010 a routine field inspection identified significant vertical displacement of a helical anchor grillage foundation supporting an Alabama Power Company transmission tower on a critical 230kV line in south Alabama. A closer below grade inspection revealed severe corrosion of the helical anchors at and slightly below the ground line. The foundation supported the middle tower of a 3 tower guyed aluminum lattice structure on a critical 230kV line in the Mobile, Alabama area. Each tower of the structure was supported on individual helical anchor grillage foundations and each foundation was composed of 3 helical pipe anchors and a wide-flange grillage top. The helical anchors were originally installed to a depth of approximately 40 feet (12.19 meters) and into dense sands. The structure and foundations were installed in 1970. See Photograph 1
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