I-84 Over Sandy River Bridge Replacement
Owner: Oregon Department of Transportation
Contractor: Hamilton Construction
Project Location: Troutdale, Oregon
Engineering Service: Construction Support Engineering
Design for a beam launching system supporting two 90ft wide, 100Ton Gantry Cranes along a 900ft long traveling rail. Using pile supported steel framework spanning over the waterway allowed top-down construction of the replacement I-84 Sandy River Bridge in Troutdale Oregon. Gantry cranes were designed to operate independently or in tandem to erect multiple steel tub girder segments up to 167 feet in length. Frame connections were designed for ease in relocating the entire system from Eastbound Bridge construction to Westbound Bridge construction as required to complete the project. The gantry system’s support structure reduced the need for in-water piles from 100 down to 12 after serious concerns arose regarding river debris damming at the temporary piles that could dramatically increase flooding risks for nearby homes and businesses.
This project received national attention in Engineering News Record. Read the Engineering News article
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