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Northern Edge of Bored Tunnel, SR 99 Tunnel Project, Seattle, WA
USA

This extraordinary view shows you where Bertha, the SR 99 tunneling machine, installs the curved concrete segments that form the walls of the tunnel. You can see the silver hydraulic jacks that retract to allow space for each segment. Directly overhead is Bertha’s red segment erector, which uses vacuum power to lift each segment and rotate it into place. Once a segment is in place, the jacks secure it. When all 10 segments have been placed together to form a ring, the jacks push forward six-and-a-half feet and start the process all over again. To the south, beyond Bertha’s 326 feet of trailing gear, is the light at the southern end of the tunnel.

This 360-degree photo is part of a virtual tour of the SR 99 Tunnel Project in Seattle. Learn more about the Alaskan Way Viaduct Replacement Program at www.alaskanwayviaduct.org or follow Bertha, the SR 99 tunneling machine, on Twitter @BerthaDigsSR99.

Copyright: Bill Edwards
Type: Spherical
Resolution: 15048x7524
Taken: 07/08/2014
Uploaded: 17/09/2014
Updated: 11/04/2015
Views:

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Tags: alaskan way viaduct; tunnel; wsdot; seattle; washington; bertha; tbm; tunnel boring machine; construction; sr 99
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More About USA

The United States is one of the most diverse countries on earth, jam packed full of amazing sights from St. Patrick's cathedral in New York to Mount Hollywood California.The Northeast region is where it all started. Thirteen British colonies fought the American Revolution from here and won their independence in the first successful colonial rebellion in history. Take a look at these rolling hills carpeted with foliage along the Hudson river here, north of New York City.The American south is known for its polite people and slow pace of life. Probably they move slowly because it's so hot. Southerners tend not to trust people from "up north" because they talk too fast. Here's a cemetery in Georgia where you can find graves of soldiers from the Civil War.The West Coast is sort of like another country that exists to make the east coast jealous. California is full of nothing but grizzly old miners digging for gold, a few gangster rappers, and then actors. That is to say, the West Coast functions as the imagination of the US, like a weird little brother who teases everybody then gets famous for making freaky art.The central part of the country is flat farmland all the way over to the Rocky Mountains. Up in the northwest corner you can find creative people in places like Portland and Seattle, along with awesome snowboarding and good beer. Text by Steve Smith.