Investigators will require months to determine the causes of accidents in two cities that killed three union ironworkers on Feb. 8. The family of the ironworker who died in suburban Chicago has filed a wrongful death suit, alleging contractor negligence in the collapse of a steel structure that struck him at a hospital project site. In the other accident, in New York City, it is not clear whether two workers who fell 65 feet were wearing protective equipment. The family of the Chicago ironworker, Kenneth Puplava, 43, has filed suit in Cook County Circuit Court, naming contractors at the Glenbrook
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.