Siefert Associates, LLC has successfully completed hundreds of projects since its inception.
Below is a sample of the projects that highlight our construction engineering capabilities in action. Imagine how our abilities can make your next project successful and profitable.
Location: Staten Island, NY and Bayonne, NJ
Owner: The Port Authority of New York and New Jersey
Contractors: Skanska Koch-Kiewit, JV
Siefert Associates’, LLC scope of work included demolition and erection plans of the main span and approaches, design of temporary shoring and foundations, analysis of the structure under transporter loads and design of various temporary work platforms and unique rigging/lifting structures.
Location: Boston, MA
Owner: Massachusetts Department of Transportation
Contractors: Atlantic Coast Dismantling, LLC
To facilitate the safe demolition of this bridge, Siefert Associates, LLC was hired to perform bridge demolition analysis and prepare engineered lift plans. SALLC analyzed the existing superstructure for construction equipment loading, analyzed the staged removal of sections of the main span truss, and designed temporary bracing of the main span truss and approach span girders. The steel truss mainspan and most of the approach spans were removed with a large crane on a barge.
Location: Jersey City & Kearny, New Jersey
Owner: New Jersey Department of Transportation
Contractors: George Harms Construction Company & Atlantic Coast Dismantling
Siefert Associates, LLC was hired by the subcontractor to create working drawings, procedures, and calculations to demolish the existing vertical-lift bridge safely and efficiently. SALLC analyzed various equipment on the superstructure during operations, designed temporary support and bracing schemes, and devised alternative methods of demolition as required. The team was also hired by the general contractor to collaborate on the lift plans for the new approach spans and on-ramps, analyzing the stability of straight and curved girders throughout erection and designing bracing, as required.
Location: Tarrytown, NY
Owner: New York State Thruway Authority
Contractors: Tutor Perini Corporation & Tappan Zee Constructors
Siefert Associates, LLC was selected to provide services for the repair of the Tappan Zee bridge and the construction of the 3-mile long new bridge, which included several demolition and erection plans and the design of a 170ft bulkhead, a 1000ft temporary trestle bridge, and cofferdams to support construction. Other services included the analysis and engineered lift plans of curved steel girders, support of excavation, and the design of a temporary storage platform.