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Tag: TBM
Roadbuilding
Virginia’s largest ever infrastructure project involves tunnel boring machine
Construction for Virginia's Hampton Roads Bridge-Tunnel Expansion is underway. Watch VDOT explain the tunnel boring process here on Equipment World.
November 5, 2020
Roadbuilding
Last road panel installed in Seattle SR-99 tunnel dug by Bertha
The Washington State Department of Transportation reports that the last of 1,152 road panels have been installed on the new State Route 99 tunnel, which will replace the Alaskan Way Viaduct. The panels form the lower deck of the double-deck highway, which will allow drivers to travel under downtown Seattle as a bypass or stay […]
April 2, 2018
Roadbuilding
Bertha sees daylight, finishes 1.7-mile boring work for SR 99 tunnel
Sixty-four years after the Alaskan Way Viaduct was first opened to traffic, Bertha, the world’s largest tunnel boring machine, broke through the end of a more than 9,270-foot tunnel for Seattle’s SR 99. “This is a historic moment in our state’s transportation history,” says Washington State Gov. Jay Inslee. “Innovation and perseverance are the engines […]
April 6, 2017
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
Excavation stopped on Big Bertha repair pit due to major ground sinkage in area
The latest in a long string of delays to affect tunnel-boring machine Big Bertha has far greater implications than any of the others, this time threatening the structural integrity of the Alaskan Way viaduct and nearby buildings in the Seattle neighborhood of Pioneer Square. According to a report from The Seattle Times, Washington State Department of Transportation officials […]
December 15, 2014
Construction Equipment
Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Crews in Seattle are now expected to finish digging a 12-story pit to reach stalled tunnel-boring machine Big Bertha one month later than planned due to concrete pilings proving more difficult to drill through than expected, according to a report from the Seattle Times. Bertha, the world’s largest tunnel-boring machine went down from overheating in late January, […]
July 31, 2014
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
Construction Equipment
Lady Bird is the 1,300-ton tunnel-boring machine digging DC’s 13-mile sewer tunnel (PHOTOS, VIDEO)
[imagebrowser id=46] Each year in Washington, D.C., about 2 billion gallons of raw sewage is dumped into the Potomac River, the Anacostia River and Rock Creek, according to a report from the Washington Post. But Lady Bird, a massive tunnel-boring machine, is working to change that. The machine is digging a $2.6 billion 13-mile tunnel system […]
March 19, 2014
Construction Equipment
Repairs to Big Bertha will require a 12-story pit and removing the tunnel-boring machine’s cutterhead
Officials from the Washington State Department of Transportation have announced that in order to repair the world’s largest tunnel-boring machine, her head will need to come off. The announcement, which came during a presentation to city council members in Seattle, comes nearly three weeks after WSDOT officials announced that Big Bertha would be out of […]
February 27, 2014
Construction Equipment
Baby Bertha? Bechtel builds mini tunnel-boring machine using 50,000 Legos
The Lego Movie, which hit theaters this past weekend, is fantastic. But we wish the folks who made it had talked to Bechtel first to include the company’s incredible miniature tunnel-boring machine (TBM). The company commissioned professional Lego builders Bright Bricks who assembled a moving, 6-1/2 foot TBM using 50,000 Lego bricks. Like Big Bertha, […]
February 10, 2014
Construction Equipment
Another mystery overheats, halts tunnel-boring machine Big Bertha once more
The Washington State Department of Transportation officials in charge of the world’s largest tunnel-boring machine have another mystery on their hands deep below Seattle. After finally getting moving again last week following a two-month period of downtime, Big Bertha has been halted once again. This time, for a different, and unknown, reason. Workers put Bertha […]
February 4, 2014
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