Triborough Bridge
Location: Ward's and Randall's Island, NYContractor: Koch Skanska
Status: Under Construction
Demolition of existing ramps and widening of roadway. Siefert Associates responsible for: Demolition and erection plans, jacking, post tensioning, and steel retrofit operations.
Amtrak Ventilation Shafts
Location: Long Island City, NYContractor: Granite Construction Northeast
Status: Completed
Construction of new ventilation shaft system for Amtrak. Siefert Associates responsible for: Concrete shoring and formwork design, work platforms, lift drawings
Shell At Grade Interlocking
Location: Roslyn, NYStatus: Completed
Replacement of existing Metro North catenary trusses with new structures. Siefert Associates responsible for: Existing demolition plans and new erection plans, support of excavation, bearing replacement plans
Sikorsky Bridge
Contractor: Balfour BeattyStatus: Completed
Demolition of existing remaining bridge. Siefert Associates responsible for: Girder removal and demolition plans, temporary support of piers, and erection of new girders.
EMPAC Building
Location: Troy, NYContractor: Jersen Construction
Status: Completed
Construction of new Experimental Media and Performing Arts Center. Siefert Associates responsible for: Stability bracing of new structure, crane surcharge analysis, erection plans and winter concrete plan.
Roslyn Viaduct
Location: Roslyn, NYStatus: Under Construction
Demolition of existing Rte. 25A viaduct over the Hempstead Harbor and erection of a new pre-cast concrete segmental bridge structure. Siefert Associates responsible for: Demolition plan, temporary support systems, structure lifting operations
Other Projects
