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Project Date: 2012 - Active Project
A Caterpillar mixed face EPB TBM will drive the 12ft (3.6m) diameter tunnel in highly variable clays and sands under full hydrostatic conditions.
The TBM is designed specially for the difficult undersea drive and to withstand potential hydrostatic pressures of up to 8 bar. It will launch from the 115ft deep, 28ft i.d. (35m x 8.5m) Staten Island shaft and drive toward the 80ft deep, 24ft i.d. (24.3m x 7.3m) Brooklyn shaft. Once under way, the US/Spanish Tully/OHL JV anticipates a TBM progress rate of 55ft (17m) per day.
Tunnel excavation is anticipated to being in spring of 2012 with substantial completion achieved in 2014.
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