Instrumentation & Monitoring
Installation of geotechnical instruments and monitoring of sensor thresholds
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The Challenge
- Navigating connectivity challenges
- Efficiency for commuters
- Enhanced safety monitoring
The East Side Access (ESA) project in New York City connected the Long Island Rail Road’s (LIRR) Main and Port Washington lines in Queens to a new LIRR terminal beneath Grand Central Terminal in Manhattan. The connection increased the LIRR’s capacity into Manhattan, dramatically shortening travel time for Long Island and eastern Queens commuters traveling to the East Side of Manhattan.
The Solution
Geocomp managed the geotechnical instrumentation data on the Manhattan Approach Tunnels and Queens Open-Cut Excavation. Tunnel boring machine (TBM) equipment was used to bore four TBM drives from the existing tunnel under 63rd Street and Second Avenue to the south end of the GCT tail tracks. The work also included excavation of cross passages between the tunnels and a central instrument room.
An open-cut structure was created and then decked over to serve as the TBM launch area for the Queens tunnels prior to its permanent use as an interlocking and emergency exit/ventilation facility.
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