Advantages of the Bottom Feed Stone Column Method
- The flow of stones to the column is mechanically controlled and
- The material volumes installed can be accurately allocated to precise
- Minimal soil is transported to
the surface, which results in a lower stone consumption, since the necessary lateral confining pressure around the stone column can be reached with less gravel.
- No mud handling is necessary on the site.
- Surface loss of gravel is reduced to a maximum of 2%, compared to
around 5% for the wet method.
The vibroflot penetrates with the help of vibration and air flushing.
Sometimes minimal water lubrication is useful to overcome high friction from the soils)
The stones are introduced via a tremie pipe along the vibroflot and the aid of pressurized air.
The vibroflot is moved up and down repeatedly in order to form and compact a column. Thereby, the surrounding ground is horizontally compressed and improved. The column is able to support high vertical loads.