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Tag: State Route 99 construction
Roadbuilding
State Route 99 closed in Seattle for tunnel alignment; crews making good progress
With the closure of State Route 99 due to tunnel work, construction crews are on schedule with good weather, including unusually warm daytime temperatures.
January 18, 2019
Roadbuilding
Bertha is nearly ready to start tunneling again
The massive tunnel-boring machine that’s been sidelined in Seattle for two years could be back to boring by New Year’s. The Washington State Department of Transportation announced that the Seattle Tunnel Partners had begun the final preparations before drilling gets started again with soil and sand being poured into the 120-foot-deep access pit on Sunday. Bertha […]
December 17, 2015
Roadbuilding
Bertha delayed again; won’t restart drilling until late December
The Seattle Tunnel Partners have once again delayed the restart of drilling for the State Route 99 tunnel, with Bertha not expected to start work again until Dec. 23. The Washington State Department of Transportation announced the revised schedule Thursday and said the tunnel most likely would not open until April 2018. That puts the project two years and four […]
October 26, 2015
Roadbuilding
Crews prepare soil for Bertha to begin tunneling again
One of the last steps to getting Big Bertha back to boring beneath Seattle is underway. The Washington State Department of Transportation announced October 14 Seattle Tunnel Partners would begin doing jet grouting in the soil to stabilize the ground above where the massive tunnel-boring machine is set get to work. With jet grouting, a mix of […]
October 16, 2015
Roadbuilding
Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million
Four months after crews temporarily stopped excavation on a repair pit for the world’s largest tunnel-boring machine due to ground sinkage, Seattle officials have now identified a major repair needed on a water main damaged by the sinking. Back in December, excavation stopped on the repair pit through which Big Bertha’s massive cutterhead was recently lifted as officials suspected groundwater pumping […]
April 14, 2015
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
Construction Equipment
Camera gives a live view of construction on Big Bertha’s 12-story repair access pit
Just because Big Bertha is down for nearly a year, that doesn’t mean work around the world’s largest tunnel boring machine has come to a halt. And now thanks to a camera set up by the Washington State Department of Transportation, anyone can watch as that work progresses. After completing one-tenth of the 1.7-mile State Route 99 […]
May 13, 2014
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