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Tag: Bertha: Page 3
Roadbuilding
PHOTOS: Big Bertha’s 2,000-ton front end lifted to the surface. How the world’s largest tunneler was raised
[imagebrowser id=225] After a year of slumber and almost a month after chewing her way into a 12-story repair pit, Big Bertha, the world’s largest tunnel-boring machine, is finally under repair in Seattle. Crews worked for the better part of March to disassemble the machine’s front end before lifting the machine’s cutterhead and body shield panels—a […]
April 1, 2015
Roadbuilding
Big Bertha breaks through: tunnel-boring machine enters repair pit, ready for disassembly
Though she remains very far from being done, Big Bertha completed a very important leg in her journey beneath Seattle last week, breaking through a thick wall of concrete and into a 12-story pit. According to a report from the Associated Press, the world’s largest tunnel-boring machine moved 57 feet since February 17 to enter […]
March 9, 2015
Construction Equipment
Tunnel-boring machine Big Bertha shut down for “months” due to complexity of needed repairs
Washington State Department of Transportation officials say Big Bertha, the world’s largest tunnel-boring machine, is likely out of commission for months. An inspection conducted after the machine overheated in late January found that several cutterhead openings were clogged with dirt along with considerable damage to seals around the machine’s main bearing, according to a report […]
February 11, 2014
Construction Equipment
Tunnel-boring machine Big Bertha moves forward 2 feet in test run to see if blockage is fully removed
After nearly two months of downtime caused by a steel pipe stuck in her teeth, Big Bertha, the world’s largest tunnel-boring machine, briefly went back to work beneath Seattle. According to a report from the Associated Press, the Washington State Transportation Department announced that Bertha moved two feet on Tuesday which was just enough progress […]
January 30, 2014
Construction Equipment
A steel pipe is what brought Big Bertha, the world’s largest tunnel-boring machine, to a halt
The mystery is solved—in part at least. After Big Bertha, the world’s largest tunnel-boring machine, was brought to an abrupt halt on December 6th, officials at the Washington State Department of Transportation were stumped as to what was in the way. Now they know that the obstruction is a large steel pipe. A steel pipe […]
January 6, 2014
Home
No. 6 in 2013: Big Bertha digs in before being stopped in her tracks
There’s been a lot of excitement this year about the world’s largest tunnel boring machine. Named “Big Bertha,” she arrived in Seattle in April where she is digging a 1.7-mile tunnel for the new State Route 99. The $80 million machine stands five stories tall and moves along at 3 inches per minute. Despite her […]
December 30, 2013
Construction Equipment
Big Bertha, world’s largest tunnel-boring machine, arrives in Seattle
The “Big” in Bertha’s name isn’t there for the catchiness. It’s there because it’s apt. With a 57-foot diameter and a length of a football field, Big Bertha is the world’s largest tunnel-boring machine. She’s quite hefty too. Bertha is assembled from 41 parts, the largest of which weighs in at 900 tons. And she […]
April 4, 2013
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