Helical Piers

Helical Piers

Structural support for new and existing residential and commercial structures

MacLean/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 B1, hot-dipped, galvanized coating, complying with ASTM A153.  The depth of the helical 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. 

Versatile Helical Extension Systems: Steel Plate Attachments and RCS Bar Configurations

Extensions can be with or without attached helical shaped steel plates.  Each standard 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 1-1/4, 1-1/2 or 1-3/4 inches (31.7, 38 or 44.5 mm) square, or round to accommodate 2 7/8″, 3 1/2″ or 4 1/2″ pipe.  Larger and custom sizes available.  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 1-1/4, 1-1/2 or 1-3/4 inches (31.7, 38 or 44.5 mm) square

MacLean/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 application. Standard MacLean/Dixie extension bar lengths are available in 3 1/2-, 5-, 7- and 10-foot lengths.

Coupling bolts are 5/8-inch (15.9mm), 3/4-inch (19.1 mm) or 7/8-inch (22 mm) in diameter and comply with ASTM A235 Type 1, and have a Class C hot-dipped zinc coating that complies with ASTM A153.  The corresponding nuts conform to either ASTM A194 Grade 2H or ASTM A563 Grade DH.  Nuts have a Class C hot-dipped zinc coating that complies with ASTM A153.

For all helical steel pier leads and some extension shafts, helix plates are welded to their respective hubs.  Nominal spacing between helix plates is not less than 2.36 times the diameter of the lower helix. Rocky Mountain Steel Piering and Structural Services is proud to offer its clients a variety of high quality materials.  In addition to the traditional square shaft pier, we also offer a structural pipe shaft pier.