Precast Concrete Design-Construction of San Mateo-Hayward Bridge Widening Project

摘要

In recent years, the California Department of Transportation (CALTRANS) has developed innovative precast concrete connection systems for application in high seismic regions, including the San Mateo-Hayward Bridge site. The award-winning San Mateo-Hayward Bridge Widening Project is a 4.9 mile (7.9 km) twinning of an existing 30-year-old bridge in an active seismic area and over the environmentally sensitive San Francisco Bay. The only viable so- lution was an all-precast concrete substructure and superstructure consisting of driven cylinder piles, bent cap shells, bulb-tee girders, and stay-in-place deck panels. A 125-year service life was ensured through the use of epoxy-coated reinforcement, a high-pozzolan concrete mixture, and an extensive polyurea coating. Bridge construction advanced without falsework and within the existing right-of-way on a temporary work trestle. This article describes the design, production, and erection challenges, as well as the decisive advantages of precast concrete construction in environmentally sensitive and earthquake-prone regions.