36--John Day North and South Bridge Cranes Rehab

The US Army Corps of Engineers, Portland District awarded a contract for Reahbilitation of the North and South Bridge Cranes which includes the following work: All operations required to provide the design and to perform the work required to rehabilitate both existing 375-ton bridge cranes as well as rail replacement and power distribution installation at the John Day Powerhouse. The bridge cranes shall be rerated, tested and certified at 385 tons. Work includes: a. Structural Work to replace operator cabs including new captain-style operator's chair with integrated control console on both the north and south bridge cranes. b. Crane Rail Track Replacement. c. Mechanical Work includes: replace all wire rope, replace all motors, brakes, and replace couplings, replace seals and bearings, align machinery and gearing to obtain proper alignment, rebuild main and auxiliary lower and upper blocks. d. Electrical Work includes: Replace the complete existing power and control systems and associated equipment including: main line conductors, panels, enclosures, transformers, wiring, wireways, festoons, and conduit; motors and brakes with winding and enclosure heaters; gear case heaters; limit switches; and lighting. As part of the new control system, provide new flux-vector variable frequency drives (VFD) for all hoists, and provide open-loop vector VFDs for all travel. As part of the new control system, provide remote (radio) control. Provide new load cells and indication system for all hoists. Provide indication in the operator's cab and on the radio remote transmitter. Provide PA system for both cranes Location of work for the John Day bridge cranes shall be located at John Day Powerhouse.