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.  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 sizes.


Helix on a Pier


connection end of helical pier

Fountain Valley Pipe Pier


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.

Resistance Pile System

 structure foundations and protect against further foundation movement and distress.  Once the piles are installed, they act as the new foundation support for the structure.  Every component in our system is new, first quality steel.  No used pipe or components are installed, all components are in compliance with ASTM criteria.

The piles are advanced hydraulically into the soil strata to load bearing soil or rock.  Once installed the structure loads are transferred to the piles through a high strength steel bracket.  The advantages of the resistance pile system include:


  • Minimal site impact and landscape disturbance
  • Quick installation by trained and qualified installer
  • Simple, HIGH STRENGTH, bracket foundation system allows for foundation adjustment