20 Ton Adjustable Height Gantry
Project: Williamsburg Bridge, New York, NY
Client: Yonkers Contracting Company

Zieman Engineering designed this gantry to erect orthotropic panels weighing 40,000 pounds. The gantry consisted of four
10 ton electric trolley hoists, and motorized end trucks, and had telescoping legs to allow use at locations with restricted
headroom. (Orthotropic panel cart in foreground)