August 22, 2019 1:00 pm
Mark Gaines, P.E., State Bridge and Structures Engineer, Washington State DOT; Jim Parkins, P.E., Director of Marketing, Concrete Technology Corporation; and Tim Moore, P.E., S.E., Mega Projects Bridge Manager, WSDOT
Earn 1-hour Certificate of Attendance
Announcements: This portion of the webinar will provide you with the latest happenings related to ABC in the US and abroad to keep you informed. (10 minutes)
Featured Presentation: WSDOT’s Alaskan Way Viaduct Replacement Project: SR-99 Seattle Tunnel Precast Deck (35 Minutes)
Description: The Washington State Department of Transportation’s SR-99 tunnel under the city of Seattle replaces the Alaskan Way Viaduct structure. This 9,270-foot-long bored tunnel begins south of downtown and ends at South Lake Union. Seattle Tunnel Partners was selected as the contractor for this design-build project, which opened to traffic in February 2019. Inside the tunnel is a two-level interior structure with northbound traffic running on the lower deck. The lower deck was converted from cast-in-place to precast construction as a value engineering solution to facilitate and accelerate the construction. The lower deck consists of 1,152 pieces of 14 ½-inch-deep by 8-ft-wide precast slabs that span 30 ft across the width of the tunnel. This is the state’s first recent use of full-depth precast slabs, and it is the state’s longest precast deck project to date. The webinar features design, fabrication, and construction challenges of a prestressed deck project in a demanding tunnel project.
Question & Answer Period: Submit your questions when you register for the webinar and also in the question box during the webinar. (15 minutes)
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