Foundations for Cowboy’s Stadium Roof Arches

July 31, 2008 rockman Project Related 1

The overall system is the brainchild of Cyril J. Silberman, CEO of a "kinetic architecture supplier", Uni-Systems LLC in Minneapolis and his structural engineer partner, Lawrence G. Griffis of Walter P Moore. These two gentlemen have been behind at least 6 other similar projects with rolling roofs, including the Houston Astros, Houston’s Reliant Stadium, the Arizona Cardinals stadium, and the Indianapolis Colt’s new stadium. (Photo copyright ENR, Daryl Shields, and HKS)

Each arch rises 292-ft above grade, and generates a 9,500-ton thrust reaction at each abutment. The foundation system consists of a concrete thrust box to which the arch is attached with a bearing pin and a 3,400-cu-yd buried concrete box that is 176-ft long, 71-ft deep and 18-ft wide! The "shoebox scheme" was designed by noted geotechnical engineer Clyde N. Baker Jr. of STS/AECOM. In order to construct the system, 30-in thick slurry walls were used. The construction of the foundations took 5 months. The overall STADIUM cost was $690-million, including property acquisitions and other related projects, the entire project may come in at nearly $7 Billion. No word on how much the foundations cost. (Rendering copyright ENR and Walter P. Moore)

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The existing slurry walls are being incorporated into the foundation system of the new facility but not without some improvements. The are adding some kind of foundations improvements to stabilize the toe of the walls, the New York Times article calls them caissons, but I don’t know if its a tangent or secant wall or something else. They are also lining them with additional concrete and reinforcement in front of the walls along with additional tiebacks to stabilize them. In the portion of the wall that will be displayed, a counterfort wall will be constructed behind it and new tiebacks will be installed on the front. Work for the counterfort wall will be done by hand in order to avoid the existing tieback cables. All of the existing tiebacks will be left intact. Check out the NY Times article for a great graphic showing the system. (Illustration by New York Times)

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