SDOT: High bridge repair: Preparing for post-tensioning cables; more maintenance work
SDOT: High bridge repair: Preparing for post-tensioning cables; more maintenance work
The status of the bridge as of June 5, 2022.
SDOT Graphic
Fri, 06/03/2022
Information from Seattle Department of Transportation
Following last week’s completion of structural concrete pours, we continued our work on post-tensioning the bridge. Our focus this week was installing more of the 11,000 feet of ducts that will guide and protect the tensioning cablesthroughout the bridge. Once installed, these post-tensioning cables will tighten to strengthen the bridge’s concrete.
Ducts – the black, tube-like structures in the photo – were installed in this post-tensioning anchor block, which we recently poured along one of the bridge’s pier structures. SDOT photo
After we install the ducts throughout the bridge, we will begin threading the post-tensioning cables through them. These ducts prevent the tensioned cables from rusting and help ensure that they maintain their tension for decades to come. Wewill also fill the ducts with a grout compound after tensioning the cables to provide an added layer of protection.
We also made more progress on bridge maintenance projects this week, which included preparing more of the overhead sign structure foundations for new concrete. This work is being done now to make sure we’re ready to open the bridge to traffic once the repairs are completed.
