Dixie piers consist of one or more helical-shaped circular steel plates welded to a central steel hub. After fabrication, the piers have a Class Bl, hot-dipped, galvanized coating, complying with ASTM A153. The depth of the helix steel piers into the soil is typically extended by adding one or more steel hub extension shafts mechanically coupled together to form one long, continuous pier. Extensions can be with or without attached helical-shaped steel plates.
Each helical steel plate is 3/8 inch (10 mm) or 1/2 inch (13 mm) thick and has an outer diameter ranging from 6 to 15 inches (152 to 381 mm), and an inner annulus either 11/4, 11/2 or 13/4 inches (31.7, 38 or 44.5 mm) square. Each plate is formed with all radial sections normal to the central longitudinal axis,± 3 degrees. The helix pitch is 3 inches (76 mm).
The central steel hub of lead sections and extension sections is round cornered square (RCS), solid steel bars. RCS bars include 11/4, 11/2 or 13/4, inch (31.7,38 or 44.5 mm) square sizes.
Dixie anchors are available in single, double, triple and quadruple helix configurations. Helix sizes and bar sizes may be custom ordered in any combination as required for the application. Dixie extension bars are available in 31/2,5,7 and 10 foot lengths.
Each lead section of a helix steel pier has provisions at the top for a connection to an extension, and has an earth-penetrating pilot at the bottom.