Client: Kiewit/Flatiron/Manson, Joint Venture
Contract Value: $1.04 Billion
Description: Peer Review of Geometry Control & Erection Calculations
for Segmental Bridge Construction

The Skyway portion of the San Francisco/Oakland Bay Bridge is perhaps the most prominent segmental concrete bridge in the country. The casting geometry in such a structure consists of the superposition of theoretical roadway geometry and the camber required to compensate for anticipated deflection. On this project, the casting process was well underway when it was determined that the deflection data that had been used for casting was not correct. To compensate for this, calculations and survey procedures had to be modified and there was considerable concern on the part of Caltrans that this could lead to problems in structure erection.

To avoid such problems, Civil Geometrics was retained by the joint venture of Kiewit/Flatiron/Manson to check the work of their engineer, and to review overall procedures for dealing with this condition. Our work helped to provide correct erection data for this landmark project, and made a significant contribution to its successful completion. Our scope later expanded to include support for the challenging computational and survey tasks involved in the casting process as well.