The construction industry in Washington state is unprepared to meet a new rule that will require about 10,000 cranes to be inspected by Jan. 1, 2010. The new rule also requires operators to pass a state drug-and-skills exam. Photo: TEQNE On Jan. 1, 2010, mobile and tower cranes operating on construction sites in Washington state will require a thorough inspection at least once a year. “Crane operators have been busy,” says Hector Castro, a spokesman for the state’s Dept. of Labor & Industries. “The lag has been with the cranes themselves.” So far, only 700 out of an estimated 10,000
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.