In 2020, we closed the high bridge in the interest of public safety. We made this decision based on regular inspections of the bridge, which showed rapidly growing cracks. Since the closure, we've wasted no time, working to repair the high bridge and to plan and build projects across affected neighborhoods that will reduce impacts on local communities.We announced that we would repair the bridge instead of replacing it with a new span. The decision was based on input from the community, speed of traffic restoration, minimizing impacts, and cost effectiveness.
During phase 2 rehabilitation, we are building on the same tried-and-true construction methods we used in phase 1, including more epoxy injection crack filling, post-tensioning, and carbon-fiber wrapping in the main span, as well as strengthening work on the bridge's side spans (between bridge columns Pier 15 and Pier 16 and between Pier 17 and Pier 18). Diagram is not to scale.
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Our team is using multiple construction methods in our efforts to rehabilitate the high bridge. We've already used epoxy injection crack filling, carbon-fiber wrapping, and post-tensioning on the central span to stop the progression of the cracking and stabilize the structure.Full bridge rehabilitation includes more epoxy injection crack filling, post-tensioning, and carbon-fiber wrapping in the main span, as well as on the side spans (between bridge columns Pier 15 and Pier 16 and between Pier 17 and Pier 18). Through phases 1 and 2, we're also using intelligent monitoring techniques to assess how the bridge is responding to these measures, which informed our design of phase 2 (rehabilitation).
Post-tensioning steel cables reinforce the bridge structure and help prevent it from cracking. When we post-tension the high bridge, we are adding more cables inside the hollow bridge girders (not within the concrete walls of the girders) so the bridge can better support itself and respond to other environmental factors such as weather, vehicle loading, or other external forces.
In phase 1 stabilization, we installed interim measures to slow the spread of cracks, including epoxy injections coated with carbon-fiber wrap at the distressed locations.We also installed a new monitoring system of additional movement sensors, crack monitors, and monitoring cameras throughout the bridge. These monitors are improving our understanding and tracking of the health of the high bridge, with greater precision and real-time data.
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