VIBRO projects’ method of operation is used with non-cohesive soils such as sand or gravel. Compaction occurs by simultaneous vibration and saturation.

1. Suspended by a crane or other support, the Vibroflot is positioned above the selected point. With the aid of the lower water jets and its own weight, the Vibroflot penetrates to the desired depth. When this has been reached these jets are turned off.
2. Water flow is switched to the upper jets, and compaction begins. Vibration rearranges the grains around the vibrating head. To compensate for increased density, sand or gravel is added from the top. The flow of water assists the feed of fill material.
3. The Vibroflot is raised step by step, forming a compacted cylinder two to four metres in diameter. Compaction points are arranged so that the areas of influence overlap. Thus a deep raft of treated ground, having uniform density, is formed.