An inadvertent meeting of the minds during planning for a 484,000-sq-ft hospital in Dayton, Ohio, turned into an effort that has propelled multitrade prefabrication of hospital components to a new level. In the most ambitious U.S. implementation of the strategy, the construction manager estimates that prefabbing the 178 identical patient rooms and 120 overhead corridor utility racks sliced more than two months from construction and 1% to 2% off the cost of the $152-million building, which is 90% complete. The first effort is seen as just a beginning. “I want to change the design of hospitals with this process,” says
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.