Construction labor unions and industry groups agree that a newly issued National Labor Relations Board ruling upholding union “bannering” is significant and precedent-setting. Unions are jubilant about the outcome, but industry officials contend that the Aug. 27 ruling, announced on Sept. 2, could wreak havoc on construction projects. In its decision, the NLRB ruled the posting of stationary union banners by members of the United Brotherhood of Carpenters and Joiners of America at the workplace of a secondary employer does not violate federal labor laws. A secondary employer is a company that employs a contractor with which a union has
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.