New product announcements: 08/05/2009 Grading Attachments: New Option for Skid-Steer Loaders New grader attachments from Bobcat are designed to allow skid-steer loaders to perform grading work. Graders are available in 96-in. and 108-in. widths and can be incorporated with the Bobcat laser-control system to grade materials within 1⁄4-in. The heavy-duty graders’ blades are able to move in six different ways and feature a hydraulic side-shift function, which allows the blades to move up to 13-in. horizontally, allowing for grading close to buildings and other obstacles. A proportional hydraulic valve allows for the moldboard to move at three different speeds for finer
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.