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Case Studies

Alpha Foundations Case Studies: Oxford Manor Apartments - Gainesville, FL

Monday, February 14th, 2011 by Lisa Scully

Challenge

Oxford Manor Apartments has a building which had up to 3" of settlement inside the structure. Polyurethane grouting and underpinning has previously been performed to lift and level the floors in the structure. Shortly after the repairs had been made the cracks in the floors, sheetrock, and brick reopened. Due to the amount of settlement in the structure the units were unable to be rented and needed a quick lasting fix. Alpha Geotechnical and Testing Services did an investigation to determine the cause of settlement and found the presence of expansive soils on site to a depth of 25'. Further, it was determined the previously installed underpinning elements were not sufficiently supporting the structure.

Solution

Due to low overhead inside of the building and limited access around the perimeter of the structure, Alpha Geotechnical determined it would be best to support the entire structure with hydraulically-driven piers and helical piers.

A helical pile configuration of a 2-7/8" inch outside diameter round shaft, with an 8"-10" double-helix lead section was selected to support the foundation at the perimeter of the structure. The perimeter piles were installed with a Bobcat E35 mini-excavator. The interior of the structure was supported by 2-7/8" outside diameter round shaft driven piers attached by a Foundation Supportworks slab bracket.

The correlation between installation torque and driving PSI was monitored throughout installation to determine the capacity of each of the piers. The installation of 118 piers throughout the structure only took 2-1/2 weeks.

Project Summary

Project Name: Oxford Manor Apartments

Geotechnical Engineer: Alpha Geotechnical & Testing Services

Certified Installer: Alpha Foundation Specialists, Inc.

Products Installed: (80) Model 288 Push Piers installed to a depth of 30', and (38) Model 288 Helical Piers with an 8"-10" lead section, installed to a depth of 30'.

About the author
Lisa Scully is the Marketing Manager with Alpha Foundation Specialists. Her mission is to educate you on the symptoms of and solutions to all types of foundation problems. To learn more about Lisa and Alpha Foundations, visit us at www.alphafoundations.com