The project consisted of driving six 10 ft diameter piles down into bedrock. Pile lengths were 136 ft to 200 ft. The piles were drilled out and socketed into bedrock up to 30 ft. Rebar cages were installed full depth and the pile was filled with concrete. Pier caps were constructed on top of the pile. Twelve 7 ft. square precast box girder sections, ranging in length from 84 ft to 180 ft, were fabricated and set in pairs on top of the caps.
Features include a design-build concrete foundation poured underwater via tremie and precast boxes. The curved walls and flared floor of the chute were built in a 25 ft deep sheetpile coffercell. Stoplog guides, stoplogs and hoist, vertical and inclined gate guides and gates, and associated hydraulic and electrical controls were included in this project.
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33455 6th Avenue South
Federal Way, WA 98003
Tel: (253) 943-4200
Fax: (253) 943-4021