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Project:
AZ Cardinal's Stadium
Hunt Construction Group
Engineer:
Schuff Steel Co.
Ed Carroll/Ron Offenburger
Underpinning Contractor:
Arizona Helical-Piers Co.
Phoenix, AZ
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Job Description:
Anchor cables in retention: Installation of 132 A.B. Chance SS-175, with double heliced leads to be used as roof support guy-wire tension anchors. This was to be done in two phases. The first phase was installation and the second phase was to uninstall the anchors.
In Tension:
All piers had to be pull tested at a 38 to 45-degree angle, to a minimum of 50-kips and to be held there for one minute with no shaft movement. This using two 3-ft. high I-beams, 40-ft. long and sitting on cribs.
Pier depths:
The minimum installed depth from the upper helix was 42-inches with a maximum of 77-inches. The area at one time was an ancient river bed. The soils were so bad that AHPC had to rock cut the leads to even get these depths. Even at these shallow depths all the piers held well.
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In difficult circumstances, the helical pier is used successfully at the new Arizona Cardinal's Stadium.
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