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Tag: tunnel-boring machines
Roadbuilding
Seattle’s SR 99 tunnel, dug by TBM Bertha, nears completion
The State Route 99 tunnel in Seattle, Washington is officially getting its stripes which is a sign that the project is almost completed. Get more details here.
September 7, 2018
Roadbuilding
VDOT to use tunnel boring machine for first time in Hampton Roads Bridge-Tunnel expansion
VDOT will use tunnel boring machine on Hampton Roads project. Check out how the tunnel boring machine will enhance the bridge-tunnel expansion today.
August 6, 2018
Roadbuilding
Final piece of Bertha removed from Seattle’s SR 99 tunnel
The last piece of Bertha, the world’s largest tunneling machine, has been removed from Seattle’s SR 99 tunnel, marking the end of a four-month disassembly process. The machine finished its boring of the tunnel in early April, work that lasted four years. This breakthrough was roughly three years later than the original projected completion date, […]
August 25, 2017
Roadbuilding
Bertha stopped after veering off course in home stretch of Seattle’s SR 99 tunnel
Seattle Tunnel Partners (STP) stopped Bertha, the largest tunnel boring machine in the world, on Feb. 28 to make adjustments before it continues on its last 1,000 feet of the 9,270 tunnel for SR 99. Officials report recent surveys indicate the machine is potential out of alignment by several inches. “STP is conducting additional survey […]
March 3, 2017
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
PHOTOS > Big Bertha gets her head together: How to repair the world’s largest tunnel machine
With the final repairs having been made earlier this summer and Big Bertha finally picked back together underground, Washington State Department of Transportation and Seattle Tunnel Partners crews are hopeful that their 18-month nightmare is nearing a close. Now two years behind schedule, the world’s largest tunnel-boring machine is pegged for a return to digging in […]
September 29, 2015
Roadbuilding
Stronger Big Bertha cutter head lowered back into its pit for tunneling
Big Bertha’s massive cutter head is back underground after months of repairs were made to get the world’s largest tunnel-boring machine back to work. According to the Seattle Times, Big Bertha’s new, stronger front end took the 120-foot dive into the pit Tuesday as Dutch lifting company Mammoet lowered the 2,000-ton machine back down. In […]
August 27, 2015
Roadbuilding
Big Bertha is set to start drilling again in November after extensive repairs, testing
The world’s largest tunnel-boring machine is now scheduled to get back to work on November 23, nearly two years after it overheated and stalled while digging beneath Seattle. The Seattle Times reported that the construction team handling the massive undertaking of drilling the 1.8-mile Highway 99 tunnel released the new timetable and a new completion date of […]
July 21, 2015
Roadbuilding
Crews begin installation of Big Bertha’s new seal system
While the rest of her massive frame waits below ground, Big Bertha has undergone the most pivotal portion of her badly-needed brain surgery. According to a report from the Puget Sound Business Journal, repair crews with Seattle Tunnel Partners, the lead contractor on the drilling of a new State Route 99 tunnel beneath Seattle, have begun […]
June 16, 2015
Roadbuilding
Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall
In regard to the drilling of the new State Route 99 tunnel below Seattle, the Washington State Department of Transportation (WSDOT) has few friends left. There remains disagreement between the department and the city of Seattle over who will pay to repair a water main damaged during the excavation of a repair pit for Big Bertha, […]
May 12, 2015
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