MRCE Geotechnical and Foundation Engineering

Challenges Solved

The IRT subway South Ferry station at the southern tip of Manhattan was re-built in a “design build” contract to replace the old loop station. MRCE services to the design-build team included design of excavation support and underpinning to facilitate mining the new tunnel beneath 1900’s era NYC Transit tunnels. The MRCE designs maintained subway service and supported the existing tunnels within strict movement tolerances. The design provided a flexible system which could be rapidly deployed and adapted to field conditions to take advantage of the limited weekend and off-hour service outages specified by NYC Transit.

MRCE also performed a geotechnical investigation and dewatering analysis, and evaluated the impact of construction on surrounding structures. MRCE designed and implemented “real-time” instrumentation system to monitor movement of the existing subway tunnels and surrounding structures.