SDOT just announced another milestone in the West Seattle Bridge repairs, albeit a belated one – the first pour of strike-delayed specialized structural concrete, a key ingredient for strengthening the bridge before reopening it. SDOT’s announcement explains that this concrete “will be used to form structures inside the bridge to hold the new steel cables for the improved post-tensioning system” – summarized as “46 miles of steel cables … capable of holding more than 20 million pounds of force.” SDOT sent this aerial video of today’s pour – the truck’s atop the bridge but the concrete’s destination is inside:
As reported previously, the project received two deliveries of non-structural concrete earlier this month for new expansion joints, part of the maintenance work that’s being done before the bridge reopens. Today’s announcement adds, “This past week, SDOT completed the final core drills through the bridge’s pier structures, which is another major milestone to get ready for installing the new post-tensioning system. SDOT and its contractor have also be been continuing to make progress filling existing cracks with epoxy and installing carbon wrapping on both the interior and exterior of the bridge.” As for when the bridge will reopen, SDOT reiterated today that they can’t reassess the schedule until all the concrete pours for the post-tensioning are complete.