Balfour Beatty plc, the U.K.-based global construction giant, announced on Sept. 17 it would acquire U.S. engineering stalwart Parsons Brinckerhoff for $626 million. The deal, which officials say would keep the 13,000-employee PB intact as a wholly owned subsidiary, is still subject to approval by shareholders of both firms. The acquisition, to be financed mainly by Balfour Beatty selling its own shares to existing investors, is to be completed late next month. About 4,700 PB shareholders will vote on the proposed purchase on Oct. 21. Photo: Massachusetts Turnpike Authority PB Signature Projects include Boston’s $15-billion Central Artery/Tunnel. Photo: Trevor Rayton,
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.