In the SOB continuous flight auger drilling method, the auger is rotated into the ground to its final depth in a single operation. The concrete is conveyed to the concrete outlet at the lower end of the auger via the core barrel, thus producing the in-situ concrete pile as the auger is pulled. The loosening and conveying of soil takes place continuously.
The auger is equipped with continuous flights over its full length. The support of the borehole wall is provided by the auger flights filled with the drilled material.