John Hennessy III,
P.E.
The off-ramp bridge, part of the viaduct replacement program, is the first in the world built with two columns designed to flex during earthquake tremors and then snap back into position to remain functional. The project was based on research by the University of Nevada-Reno earthquake engineering laboratory using nickel and titanium rebar surrounded by a cement-like composite.
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After nearly a week of tunneling under the Alaskan Way Viaduct, crews are steadily continuing Bertha’s underground drive towards downtown Seattle. This video gives you a behind-the-scenes glimpse into how the new tunnel is being built, showcasing the complex operations involved in this project. Massive concrete ring segments are transported to Bertha’s segment erector where they are lifted into place, allowing the machine to push forward while the excavated soil is transported along a network of conveyer belts and into a barge moored at Elliott Bay’s Pier 46.
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After an earthquake revealed its instability in 2008, the state of Washington announced it was going to tear down a crumbling double-decker stretch of freeway known as the Alaskan Way Viaduct. After a heated debate, the state decided to use a giant drill named “Bertha” to deep-bore underground tunnel to replace it. Seven years later, the Viaduct is still up, Bertha is stuck underground, and the city’s residents have been left to wonder whether this major project will ever be worth the time and money spent on it.
View this complete post...This animation shows an example of what a tunnel boring machine looks like and how it works. – wsdot on YouTube
View this complete post...In the eight days from Oct. 21-29, 2011, crews made pretty quick work of demolishing the Alaskan Way Viaduct and opening a new mile-long section of SR 99. Since we can’t show you the full eight days of work, we made a time-lapse video so you can see the whole thing in 65 seconds. Learn […]
View this complete post...Crews work to quickly and safely demolish a span of the Alaskan Way Viaduct near South Royal Brougham Way at 2 p.m. Monday, Oct. 24. – wsdot on YouTube
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