The airport terminal expansion project in Las Vegas had its second serious accident within four months when a rebar cage collapsed and trapped five ironworkers for half an hour. On June 23, the 70-ft-long cage collapsed on ironworkers at the Terminal 3 project at McCarran International Airport. The workers were attaching interior wire supports for the No. 11-sized rebar cage, lying on the ground lengthwise. The cage was to serve as a structural component of a subterranean roadway bridge in front of the new 1.87-million-sq-ft, $2.4-billion structure. An unidentified worker used a forklift to elevate the rebar until the Clark
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.