Friday, April 24, 2015

See a giant transition span installed on the new SR 520 floating bridge

By Ian Sterling

Each girder is 190 feet long and weighs more than 15,000 pounds. It takes eight of them to make up one giant piece of hardware for the new State Route 520 floating bridge. It’s called a hinged transition span and it’s critical to the floating bridge. The span will allow the new floating bridge to move with Lake Washington and serves as a connection between the floating bridge and the fixed-column approach of the highway in Medina. It took about three days this week to complete the work shown here. 

A large crane lowers into place the first of eight 190-foot-long steel girders
that will make up the transition span between the floating bridge and
the highway’s elevated, stationary high-rise along Lake Washington’s
eastern shore. The new transition span essentially serves as a giant hinge
between the floating bridge, at left, and the fixed, immovable east high-rise,
at right. The span will support SR 520’s westbound lanes and a new, cross-lake
bicycle and pedestrian path.
April 21, 2015 - Workers secure a massive girder for the new
floating bridge’s east transition span
April 21, 2015 – The first of eight girders for the transition span is
in place, as seen from our construction cam.
More transition-span segments coming right up.
April 23, 2015 — Almost done!
The new SR 520 floating bridge is scheduled to open in spring 2016. You can watch it being built before your eyes with our live construction cameras.

2 comments:

Anonymous said...

In the photos, I notice what looks like a section of bridge being built north of the main span. Is that going to be moved to connect the east? It looks about the same height to me. Will they pull it by tug boat into place?

Anonymous said...

Yes, as of now it's been pulled into place.