Last year’s spate of deadly accidents dramatically underscored a lack of competency around cranes. Just out is a major revision to a classic reference manual that can help contractors, engineers and owners tighten up their rigging skills. Author, civil engineer and former ENR editor Joseph MacDonald has revisited jobsite planning, industry standards, hoisting methods, rigging techniques and equipment—from basic to advanced—while more than doubling the 60-year-old “Handbook of Rigging” ($99.95). Lead author MacDonald says he has rewritten 90% of the tome, which now stands at 792 pages. The book brings the reader up to speed on national regulations and industry
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.