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The Chance® Company of Centralia, Missouri, produces a modular piling system for structural foundations that can be used in a variety of situations. Typical piles are monolithic and require installation by heavy equipment, which can be disruptive to neighbors and nearby buildings. The Helical Pier® Foundation System and Helical Pulldown Micropiles® are designed for easier and less disruptive installation in tighter spaces.

Chance® helical anchors comprise steel shafts and helices of steel, selected for specific installing torques and design loads.

The helical lead, with geometry similar to a hole augur, is screwed into the ground. Steel shafts are added to extend the depth of the pile. The shafts are coupled together as if they were extensions on a socket set, except the shafts are between 1.5 inches and 2.25 inches square.

The pulldown micropile concept adds a large washer behind the helical augur at a coupling of augur to shaft or shaft to shaft. As the pile is screwed into the soil, the washer clears a cylindrical space behind it that is filled from a surface grout reservoir.

Once the grout cures, the Helical Pulldown Micropile® is effectively a reinforced concrete pile. The top of the shaft or multiple shafts can be joined in a pile cap, or attached to a foundation with brackets that can be hydraulically adjusted for remediation of settlement.

Image at right used with permission of the Chance® Company.

The Chance® Company tasked JAR Associates to develop an automated methodology to analyze the piles under combinations of vertical and lateral loads in varying soil conditions. To read a summary of this project, click here.

For more information about the Chance® Company, visit their web site at www.abchance.com.