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Project:
Tieback Application
Prescott, AZ
Engineer:
Glen Copeland, Geotech.
Prescott, AZ
Underpinning Contractor:
Arizona Helical-Piers, L.L.C.;
Gilbert, AZ
Job Description:
This two year old custom home was built 1/3rd on a fill wedge using a solid grouted concrete wall as a retention structure. 2/3rds of the home cantilevered out over a canyon supported by beams and posts. With the introduction of water, the retaining wall began to bulge and crack.
Repair:
11 Chance Helical-Piers with 8" helices were installed by AHPC in tension to act as a tieback. Piers were installed to an average depth of 29ft. The piers were tied together with a whaler made up of two continuous 6in. steel channels. Each pier was set in tension and tested with cracks grouted. The retaining wall was secured and no further movement will occur.
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