This unique seismic retrofit was completed at the intersection of two of the busiest interstates in Washington, I-90 and I-5. The project called for the strengthening of 12 existing crossbeams that support the dual-level I-90 bridge over I-5 (including new seismic restrainers and modifications to existing ones), and the installation of 14 grout-filled steel column jackets. The project added approximately 60 cubic yards of new reinforced concrete with multistrand and high-strength posttensioning to each crossbeam. In addition, six grout-filled column jackets were installed to strengthen the Jose P. Rizal Memorial Bridge.
Due to high traffic volume, the project team performed the majority of work during overnight hours. This involved numerous traffic-control setups, including shifting all northbound and southbound lanes on I-5 using temporary striping, then shifting back after completion. As an innovation, and to aid in proper concrete consolidation in the crossbeams, the project team gained approval to use self-consolidating concrete (SCC). This project was the client’s first experience with SCC in a structural application, and it contributed to the PCL team delivering a finished project under budget and 34 days ahead of schedule.
As a positive result of the project team’s focus on partnering and innovation, PCL was awarded a 2011 Excellence in Contract Administration Award by the client and the Associated General Contractors of Washington.
Washington State Department of Transportation and the Associated General Contractors - Excellence in Contract Administration
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