ABSTRACT

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