New product announcements: 05/27/2009 Wheeled Excavator: Heavy Duty and Road Ready The EW230C wheeled excavator is in the 20-ton weight class, and is designed for heavy-lifting applications such as the laying of large pipe and digging into hard materials. The rear axle weight does not exceed 12 tons when fitted with a standard counterweight, allowing the excavator to travel on roads. The excavator features a heavy-duty slew ring for extra durability, and a two-pump load-sensing hydraulic system. It is available with a either a mono or two-piece 18-ft, 8-in. boom. Volvo Construction Equipment; 828-650-2000; www.volvo.com Circular Saw: High Power in Lightweight
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.