INNOVATIVE USE OF PRECAST CONCRETE FOR THE ELLIOTT BAY SEAWALL REPLACEMENT PROJECT

摘要

The Elliott Bay Seawall protects Seattle’s downtown waterfront from waves and the erosive forces of Puget Sound and Elliott Bay. It serves to protect the core waterfront commercial district and the Alaskan Way arterial corridor, as well as major regional utilities and access to the busy Colman Dock ferry terminal.rnOriginally constructed in the early 1900's, the seawall requires replacement due to its deteriorating condition and seismic vulnerability. When completed, the new seawall will feature an expanded cantilevered sidewalk with a light penetrating sidewalk surface that serves to promote improved marine habitat along the project's 3,700 foot length. The new seawall structure will be supported on a jet grout-improved cellular soil mass to mitigate soil liquefaction effects in a seismic event.rnThe new seawall structure makes extensive use of modular precast concrete components to speed construction, reduce project costs, and minimize impacts to adjacent properties. Precast elements include custom precast face panels fitted with precast habitat shelves, precast zee-shaped superstructure segments, and precast light penetrating sidewalk panels. This presentation will provide an overview of the Elliott Bay Seawall project and focus on the key design and construction considerations associated with use of precast concrete components for the new structure.