information from Seattle Department of Transportation

Last Saturday, we hoisted the final two work platforms into place under the east span of the bridge. The team maneuvered both 50,000-pound work platforms from their assembly locations to the hoist positions using four forklifts. Relocating these platforms required precise, coordinated movements from our crew members who were operating the forklifts

Using forklifts, we maneuvered the work platforms into place under the bridge and attached cables that were connected to winches on the bridge deck.

With the cables attached, we used winches to raise the work platforms 120 feet to the underside of the bridge.

Once the work platforms were in the right position, we attached cables that were connected to the bridge deck and raised the work platforms 120 feet to the underside of the bridge.  

To watch the platform hoisting in process, you can check out our time-lapse video. 

With the new elevated platforms in place, we began injecting epoxy on the underside of the bridge and assembling scaffolding so we can install carbon-fiber wrap beginning next week. 

Markings on the bridges interior show where crews have completed scanning with ground penetrating radar.

We also continued scanning the interior of the bridge this week using ground penetrating radar. Radar scanning helps us identify optimal locations to drill cores through the concrete, creating openings for the next phase of post-tensioning cable installation that we use to reinforce the strength of the bridge’s concrete.