What work is WSDOT doing to the bridges drive systems?
In late 2009, WSDOT Bridge Preservation engineers began reviewing the bridge’s new drive systems, which extend and retract the draw span pontoons. In 2010, crews will be fine tuning the four motors on each draw span to eliminate vibrations that are occurring when the bridge is opened and closed. The tuning is aimed at eliminating or reducing the vibrations, allowing the bridge to open and close more fluidly and without unnecessary wear on the components. WSDOT hired a Drive Specialist in December of 2009 and the Engineer of Record earlier his year to assist with the drive tuning. Notable improvements to the operation of the Drives were accomplished, but were not eliminated.
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