Vibro compaction of granular soils
The design principles of modern depth vibrators have changed little since the time they were invented and then further developed to suit the needs of practical use on-site. The vibrator is essentially a cylindrical steel tube with external diameters ranging between 300 and almost 500 mm, containing internally as its main feature an eccentric weight at the bottom, mounted on a vertical shaft that is linked to a motor in the body of the machine above. The length of the vibrator is typically between 3 and 4.5 m and its weight ranges from 1500 to about 4500 kg. Figure 3.1 displays these features in a cross-sectional presentation.