Klingner provided civil, structural, electrical and mechanical design services to develop the sequence of lifting and coordinating with the overhead crane manufacturer for engineered lifts to replace three 132,000 lb transformers, using the existing 50-ton bridge cranes, inside the Griffin Wheel Company plant in Keokuk, Iowa.
Structural services consisted of the design of modifications to the existing concrete transformer vault walls and ceilings, and the design of removable precast roof and wall panels in order to allow access for the overhead crane hook to set the transformers in place quickly, while minimizing the plant shut down time. Klingner included designs for new service platforms, equipment supports and modifications to strengthen the transformer base foundations and vault ceiling. These designs included a special lifting sequence in order to utilize Griffin Wheel Company’s own overhead cranes to remove and replace the transformers.
Due to a very small clearance on each side of the new transformer, Klingner designed a set of four custom-length choker cables to account for the eccentric center of gravity of the transformer. The chokers ensured that the crane hook was directly above the center of gravity and that the transformer hung plumb, which allowed the 17.5’ tall transformer to fit through the narrow, existing opening. (see left photo above). Klingner also provided environmental services throughout other phases of this project.