Photo by Peter Reina Damaged tower crane dangling after crash. Photo by Peter Reina Related Links: Helicopter Strikes Tower Crane at London High-Rise Project Agusta 109 Helicopter Accident specialists with the U.K. government have launched investigations into the early morning Jan. 16 helicopter crash into a crane attached to a 180-meter-tall residential building under construction in central London. Both the helicopter pilot and a man in the street were killed. Six days after the accident, the building contractor started removing the damaged crane and ordered a replacement to complete the Tower, One St George Wharf project later this year.The twin-engine
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.