To get the world’s tallest building to stretch beyond 800 meters (slide-1), workers jacked, in eight lifts, a steel-pipe pinnacle from a lifting apparatus within the steel spire (slide-2). Crews are expected to finish the cladding, including the spire’s cover (slide-3), several months before the projected fall finish. Slide Show
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.