New York/USA

Tunnel Surveyors use the latest technology on New York‘s No. 7 Subway Line Extension

Untertiteltext Englisch

Vortext Englisch

To a tunnel surveyor, the particular section of the Metropo-litan Transportation Authority‘s $2.1 billion No. 7 Line Extension project that stretches under several blocks on Manhattan‘s far west side didn‘t present any unexpected challenges. But that’s only because loose ground requiring freezing, working around an underground orchestra of heavy equipment, high vibrations, strict construction tolerances and aggressive construction schedules fall well within “expected conditions” for tunnel work on projects of this magnitude. Given the extreme challenges of tunnel surveying compared to...

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