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Project:
Del Webb's Sun City
Sun City West, AZ
Engineer:
Bingham Engineering, Inc.
Daniel Bingham
Underpinning Contractor:
Arizona Helical-Piers, L.L.C.;
Gilbert, AZ
Job Description:
The Del Webb Corporation called on AHPC to tieback (using the A.B. Chance Helical-Pier) 333ft of reinforced block retaining wall.
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  Repair:
A total of 36 Helical-Piers were installed to stabilize and stop further movement. The heel side of the wall had to be hand dug, drain holes drilled and tehn backfilled with gravel for drainage.
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AHPC received a letter of recommendation from the Del Webb Corp. for its courteous attention and respect shown towards the many folks whose yards we were working in.
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Looking closely, notice numerous helical-piers (used in the tieback configuration) can be seen coming through the retaining wall into the heelside trench and then on into the soil. Here, capacities are reached through torque; retention capacities were 25 kips working load per pier with an ultimate of 50 kips.
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