Bergmann rehabilitated a counterweight trunnion bearing on a 1914 vintage Strauss Heel Trunnion bascule bridge for CSXT, including replacement of the bushing, sleeve, pin and studs with our mechanical team partners at Stafford Bandlow. Our structural team designed an innovative jacking system to provide an alternate load path and jump the 700-ton counterweight load around the bearing assembly allowing for its removal and replacement. The jacking system used a system of horizontal and vertical hydraulic jacks with temporary steel supports and bracing attached to the counterweight tower.
This project required an intricate and complex structural and mechanical design to replace a heavily deteriorated counterweight trunnion bearing in a manner that minimized impacts to rail and navigation operations. Once complete, the repairs significantly reduced machinery friction and operating loads and extended the service life of the bridge for many years to come.
2017 | Bridge Award Winner - Association for Bridge Construction and Design (ABCD)