Boston's Third Harbor Tunnel (Available only in Focus on Geo/Environmental Special Issue)

by Axel J. Pollak, (M.ASCE), Principal; Sverdrup Civil, Inc., New York,
V. Peter Lalas, Sr. Struct. Engr.; Sverdrup Civil, Inc., New York,

Serial Information: Civil Engineering—ASCE, 1996, Vol. 66, Issue 3, Pg. 3A-6A

Document Type: Feature article


Boston's immersed marine tube, the Third Harbor Tunnel, connecting South Boston and Logan Airport, is a $226 million component of the multi-billion dollar Central Artery/Third Harbor Tunnel Project. About two-thirds of the double-bore, 1171m long tunnel trench was constructed through bedrock. The tunnel's 12 tubes are each 97.5m long, linked by specially developed flexible joints that were designed for both structural integrity and water-tightness. The individual tubes are shells of steel plate reinforced and weighted with concrete. The tunnel was scheduled to open in December 1995.

Subject Headings: Tunnels | Ports and harbors | Tubes (structure) | Steel plates | Reinforced concrete | Water tunnels | Trenches | Boston | Massachusetts | United States

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