Photo Courtesy of Sundt-Slayden A bridge job employs prefabricated arches and nitrogen-cooled concrete. Photo Courtesy of Sundt-Slayden Related Links: Truss Travels On Teflon-Coated Track Prefabricated steel arches, liquid nitrogen-cooled concrete and two perched box caisson river piers are facilitating the construction of a new $307.5-million Sellwood Bridge in Portland, Ore.—the largest project of its kind in the history of Multnomah County.In 2013, crews with the Sundt-Slayden joint venture contractor moved a 1,100-ft-long truss span 66 ft north to serve as a temporary detour over the Willamette River. Since then, other techniques have kept the team busy. Crews are currently erecting
Offshore wind seeks a place in the U.S. power mix, with the start-up imminent of a 30-MW Rhode Island wind farm, America’s first. European competitors and oil-sector veterans are bringing technology and cost efficiency.