Three days after a contractors’ trade group requested more time to comply with new federal crane-safety regulations, the U.S. Occupational Safety and Health Administration nevertheless plans to begin enforcing the standard on Nov. 8, as scheduled. Photo: OSHA Regulators plan to enforce new crane rules as scheduled on Nov. 8. Related Links: Builders Want To Push Back Crane-Safety Rules “The standard was published on Aug. 9 and goes into effect within 90 days,” writes Diana Petterson, federal OSHA spokeswoman, in an Aug. 31 e-mail to ENR. On Aug. 27, the Associated Builders and Contractors (ABC) sent a letter to OSHA
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.