TOP 10 US MEGASTRUCTURES

THE CENTRAL ARTERY / Tunnel project was one of the most complex projects undertaken within America , in order to reduce congestion and strengthen existing transport infrastructures . The project saw the demolition of the area ’ s six lane central artery ( I-93 ), which was then replaced with an undergone highway , two bridges and connecting links to Boston ’ s Logan International Airport and linked downtown Boston to the waterfront .

With funding for the project approved in 1987 , the project took approximately 15 years to construct due to opposition , escalating costs and construction difficulties , finally commencing in the 1990s . Over 5,000 workers undertook vital works to ensure the impact to traffic flow remained limited throughout the building work , such as the construction of concrete walls to support the old highway , a bespoke jack to support the railway tracks at South Station and the implementation of horizontal braces .

Constructed by Bechtel Corporation and Parsons Brinckerhoff were responsible for the projects design , alongside engineer Christian Menn who designed the Leonard P . Zakim Bunker Hill Memorial Bridge . The teams worked in collaboration with a multitude of contractors : Skanska USA , Modern Continental , contractors Tutor Perini , Jay Cashman , Obayashi Corporation , J . F . White Contracting and Kiewit .

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