The International Information Center for Geotechnical Engineers



The module which vibrates and compacts the surrounding material is known as the vibroflot. Vibroflot dimensions  and vibrating capabilities vary by manufacturer and are often modified by contractors to suit their intended purpose.  As part of quality assurance, it is important to verify that the vibroflot mobilized is the one pretedermined, since minor variations can greatly affect performance.  

Though dimensions vary, generally they are 7 feet or greater in length, and rely upon an electric motor or hydraulic power to generate the desired vibratory forces. The vibratory forces are generated by a rotating eccentric shaft with frequencies ranging from about 2000 to 3000 revolutions per minute. The vibroflot is made up of two sections: the vibrator and the follow-up pipe. The vibrator typically weighs on the order of 10,000 to 20,000 pounds and generates a centrifugal force of 43,000 to 70,000 pounds (Bauer Maschinen GmbH, 2012). There are multiple water discharge points along the apparatus, one of which is near the top (the upper jet) and one at the base (the bottom jet). The follow-up pipe remains nearly stationary during operation and acts as a rigid casing, providing protection to the power and water supply. Figure 7 below provides a cross-section and typical dimensions of the device.

Figure 7: Vibroflot cross section (D’Appolonia, 1954)

Figure 7: Vibroflot cross section (D’Appolonia, 1954)

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