In Japan, space comes at a premium, so it is no surprise that small drills rule the jobsite there. Contractors here are now warming up fast to Japan’s small, torque-heavy impact drivers. Impact guns are not just for mechanics anymore. In Japan, cordless impacts have a staggering 95% share because of ergonomics and available accessories, according to Baltimore-based DeWalt. Convincing workers here that they are tough enough is a challenge: This year, both DeWalt and Milwaukee came out with hardened bits designed for cordless impacts, because their less-expensive, traditional bits snap under the pressure. Photo: DeWalt More trades are warming
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.