Roslyn Viaduct

Services: Structural Lifting Operations, Temporary Support
Location: Nassau County, NY
Owner: New York State Department of Transportation
Contractors: Tully Construction / NAB Construction Company

The Roslyn Viaduct Bridge Project was a full replacement of the existing Rte. 25A viaduct over the Hempstead Harbor with a new pre-cast concrete segmental bridge structure. Siefert Associates, LLC and Tully / NAB Construction utilized the innovative solution of a Dual Launching Girder System for the demolition of entire spans in order to minimize the construction time and costs of the project. Pin-connected (hung) spans were lowered to the ground using a jack-down scheme. In addition to demolition plans, Siefert Associates, LLC was responsible for structure lifting operations, temporary support systems, and many other construction engineering services.

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Connecticut Office: 180 Church Street, Naugatuck, CT 06770                                                                                                   

New York Office: 188 East Post Road, White Plains, NY 10601                                                                                                                                            © 2017 by Siefert Associates, LLC ​