BRIDGE CONSTRUCTION: NY begins trestle platform for Tappan Zee

The trestle will support a crane for constructing the New NY Bridge

Bridge Construction News New York State Thruway Authority August 27, 2013
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Work is scheduled to begin this week on the Rockland trestle, which is the second temporary work platform to be constructed as part of the New NY Bridge Project to replace the Tappan Zee Bridge.


The work will include daytime pile driving to install the temporary foundation piles needed to support the platform. Pile driving will be limited to a maximum of 7 a.m. to 7 p.m. on weekdays and, occasionally, on Saturdays from 12 noon to 7 p.m. The trestle is a work platform that will eventually support a crane for the construction of the westernmost section of the new bridge. The 1,200-foot-long platform helps reduce the amount of dredging required near the Rockland shoreline.


Impact pile driving will continue as part of the ongoing test pile program and will continue through October at various locations for future pile foundations. This work will be performed from 7 a.m. to 7 p.m. on weekdays and, occasionally, on Saturdays from 12 noon to 7 p.m. The test pile program will verify subsurface conditions and test structural load capacities in preparation for construction of the new bridge's permanent foundation.


Beginning Monday through Wednesday one northbound right-hand lane and shoulder on I-87/I-287 between the existing Tappan Zee Bridge and Interchange 11 in Nyack will be closed from 9 a.m. to 3 p.m. for the installation of concrete traffic barriers to delineate traffic from the construction zone to ensure safety for traveling public and work crews.


Additional geotechnical borings to support design will be conducted on the river at various locations.


Tappan Zee Constructors (TZC) will continue dredging operations in the Hudson River as part of the New NY Bridge Project. Dredging will occur through Oct. 31 to avoid negatively impacting migration and spawning patterns of local sturgeon populations and other fish species.


Dredging crews will work 24/7 starting from the main navigation channel end of the dredging footprint toward the shoreline on both the Rockland and Westchester county sides of the bridge. The operations will deepen the river's shallow water level in the work zone by removing sediment from the river bottom. The dredged materials are being properly disposed of at offsite locations.

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