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- The project includes the largest use of segmental bridge construction and the largest application of steel box girders in the U.S.
- Crossing the Fort Point Channel includes the most extensive use of concrete immersed tube tunnels in the U.S., the first and largest installation of jacked vehicle tunnels in North America, and the second use of soil mix construction on the East Coast (the first use came in East Boston on the Ted Williams Tunnel).
- The project involves the largest geotechnical investigation, testing, and monitoring programs in North America. The purpose is to identify conditions in the path of tunneling work, and help prevent buildings from settling during the digging.
As crews continue to stay on – or, as is the case with several Modern jobs, ahead of – schedule, many Big Dig milestones have yet to come. These include the opening of the I-90 connection to the Ted Williams Tunnel (estimated completion in 2001), the opening of the new Artery’s northbound lanes (2002), the opening of the new cable-stayed bridge (2002), and the opening of the Artery’s southbound lanes (2003). But the Hub has reached the Big Dig’s halfway point, and the future is looking brighter and brighter as Boston is reshaped for the next millennium.
To learn more about some of the equipment we use on the Big Dig, please see our Equipment page.
There's a lot more to learn about this historic project; please visit the Central Artery/Tunnel Web site.
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