STEALTH MODE

摘要

Think of it as stealth construction. On most major urban projects, long before the first bucket of dirt has been scooped, the first pile driven, even the first property corner verified, work, in the form of pre-construc-tion survey and monitoring, has already been set in place. Critical for identifying existing conditions of adjacent properties before work begins, then monitoring those same properties-and others-for movement after startup, these facets can be as important to a design-build team as the project itself. In an ongoing project to add a third track to a 10-mile segment on the main corridor of the Long Island Rail Road (LIRR), Bronx, N.Y.-based Vibran-alysis is undertaking that effort throughout the length of the $1.8 billion project. Utilizing an arsenal of total stations, optical prisms, and an abundance of geotechnical, structural and environmental monitoring sensors, the company is helping ensure that the "before" picture is documented and any "after" events can be quickly identified and mitigated.