are used as a special kind of foundation for a new construction, as well as for strengthening of the foundation for reconstruction and walled pits. The advantage of this installation is the lack of driving dynamic effect on soil and foundations of existing buildings, which is an important factor in the management of construction in restricted urban areas.

1. Piles of variable lengths can be extended through soft, compressible, or swelling soils into suitable bearing material.
2. Piles can be extended to depths below frost penetration and seasonal moisture variation.
3. Large excavations and subsequent backfill are minimized.
4. Less disruption to adjacent soil occurs.