Black Canyon Dam, Idaho
LOCATION Payette River, Idaho
CLIENT U.S. Bureau of Reclamation
PARTICIPANTS Abhe & Svoboda, Inc.
SCOPE OF WORK Steel Repair & Replacement
VALUE $1.15 million
2000 - 2001 |
In 2001 Abhe & Svoboda, Inc. rehabilitated the three drum gates of the Black Canyon Dam. Each of the drum gates are 64 feet x 14.5 feet. The drum gates and pier plates were abrasive blasted using recyclable steel grit abrasive. SSPC Class 1A containments were erected utilizing a BEECHE platform and Etobicoke® System Scaffolding. Blasting operations involved work in extreme confined spaces. The paint system that was spray applied to the exterior skin plate surfaces of the drum gates was Wasser High Tech Coatings Moisture Cure Zinc/Polyurethane System (MC Zinc primer, MC Ferrox B intermediate, and MC Ferrox A topcoat). After the gate steel surfaces were abrasive blasted, the gates were inspected for proper surface preparation. During this inspection a major problem was encountered with the drum gate bronze aluminum hinge pins. Several 3" diameter hinge pins were broken. A change order was issued to remove and replace all of the 17 broken hinge pins. Special hardware removal procedures and expedited pin fabrication were required to completed the project on schedule. The project had a very strict construction schedule. The work was performed during a shut down period from October through March. The reservoir was lowered to allow work on the drum gates in an un-watered state. All of the work was required to be completed before March when the shut down period was over and spring runoff water from the mountains raised the reservoir water level. The project was completed in early March, almost a full month ahead of schedule. |
