Grouted Micropiles and Helical Piers

Helical piles are a factory-manufactured steel foundation system consisting of a central shaft with one or more helix-shaped bearing plates, commonly referred to as blades or flights, welded to the lead section. Extension shafts, with or without additional helix blades, are used to extend the pile to competent load-bearing soils and to achieve design depth and capacity. Brackets are used at the tops of the piles for attachment to structures, either for new construction or retrofit applications. Helical piles are advanced (screwed) into the ground with the application of torque.

A grouted micropile is a pile that is advanced through a grout reservoir at the surface. The lead displacement plate pushes soil outward and away from the central shaft and allows specialty micropile grout from the reservoir to flow by gravity into the void being created. The grout column surrounds the pile shaft to create a pile that is more resistant to buckling, and provides additional “frictional” capacity at the grout/soil interface.

Whiting-Turner – 1623 Farnam – New Construction/ Retrofit Helicals

The extra equipment and steel proposed for the project would result in an excess amount of load on the existing foundation, beyond its original design. The project designers needed to engineer the deflection criteria to a critical standard that necessitated very little movement. This required the structure to be supported on a deep foundation system to better meet the engineering requirement. Thrasher Commercial was called on to install helical piles; new construction and retrofits. They found it necessary to provide an unorthodox solution to overcoming the constraints of a small working area. Read the Case Study here. 

A full-scale load test was performed in the lower level of the building before installation of the helical piles. The results determined that the installed deep foundation system would deliver a capacity of at least three times the designed working loads.

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Our Approach to Deep Foundations

A deep foundation system provides support for building loads utilizing piers or piles to reach a deeper, more stable subsurface layer. Deep foundation takes advantage of more stable strata and even bedrock to support the higher engineered loads required by compensating for shifting, incompetent soil near the surface. 

Thrasher Commercial has a proven track record of working with Commercial Developers, General Contractors, and Ag Installation companies, providing deep foundation solutions including Helical Piles and Piers and Grouted Micropiles. 

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Contact Thrasher Commercial Group

Thrasher Commercial is your expert for deep foundation solutions in Nebraska, Kansas, Iowa and Missouri. If your next deep foundation system project includes helical piles, piering or grouted micropiles, contact Thrasher Commercial. We are experts in these and many other commercial applications and we bring the technical know-how to make sure our part is installed on-time and on-budget. 

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