Garfield and Whitman Counties, Washington
SR 127 MP 9.65 to MP 9.92, Elmer C Huntley Snake River Bridge Deck Rehabilitation
|
Hamilton, the prime contractor, constructed a structural concrete overlay on the existing Elmer C. Huntley Bridge over the Snake River in the remote Southeastern portion of the state. Staged construction was implemented to install the 1,437-foot-long overlay in the southbound first and then northbound lane. Smaller scopes of work on the project included hydro demolition on the existing bridge deck, traffic control, and bird monitoring. The narrow width of the bridge required 14-foot-wide concrete pours.
The extremely remote location of this project required extraordinary, proactive pre-planning. Work can come to a halt, and days can be lost while waiting for concrete to arrive. The closest batch plant was 1-1/2 hours away. Hamilton worked with the batch plant to develop a concrete mix that would maintain its integrity during transportation. On-site management required meticulous awareness of concrete quantities to prevent delays. The contract was completed two days early. To make it happen, Hamilton accelerated the schedule with 6-to-7-day workweeks and generally 12-hour workdays. Submittals, RFI's, and change orders were responded to and executed very quickly. The project team recognized significant risks early in the planning process. Pre-construction planning focused on minimizing risks and contingency plans to stay ahead of potential issues, such as bird monitoring, under deck access, and concrete supply challenges. Utilizing the Unifier system made tracking shop drawings and submittals very efficient. The team regularly submitted shop drawings and submittals early and avoided the need for WSDOT to scramble to quickly review late submitted items and potentially delay work. When weather days and extra force-account (FA) work delayed the critical path, a schedule update was used to justify the delays and WSDOT promptly executed a change order. Hamilton added crew from other Hamilton projects and increased workdays and hours to stay on schedule. The success of this project was guided by Hamilton and WSDOT's cohesive and efficient partnership. With Hamilton's proactive project management style and the project team's prompt responsiveness throughout the project, there were no corrective actions to be taken at the end of the project. Therefore, when close-out was to begin, the project achieved substantial completion and physical completion on the same day. |
Major Project Elements
|
|
Awards:
|
