New product announcements: 07/01/2009 Soil-Mixing Cutter Drums: Digging Deep The Casagrande/TEC Cutter soil-mixer rigs feature soil-mixing cutter drums mounted on a dual-motor frame that is attached to a base by a Kelly bar. The rig can mix soil at depths ranging from 17 to 30 meters and fits Casagrande base carriers. The machine can be used to construct temporary diaphragm walls and cut-off walls. Depending on soil conditions, drilling rates can be as high as 35 sq m per hour. During use, cement slurry is mixed with excavated earth at the bottom of the tool, so the quantity of excavated earth
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.