FRANKI DRIVEN CAST-IN-SITU PILES (DCIS)
The Franki pile has been used extensively throughout Southern Africa for over 65 years and is still today one of the most popular pile types. With a wide range of pile sizes and the advantages of the enlarged base, the Franki pile is suited to structures that vary from single-storey residential buildings to multi-storey office blocks. There are also some interesting variations in the installation technique which have special applications.
- The Franki pile is often a very economical system
- There is an extensive range of pile sizes
- The Franki pile has an excellent load / deflection performance
- Noise levels are relatively low
- The Franki pile has excellent tension load capacity
- Vibration associated with the driving of the piling tube and the formation of the enlarged base
- Pile heave in saturated cohesive soil profiles
The main feature of the Franki pile is the enlarged base formed at the toe of the pile. In forming the enlarged base the end-bearing area is increased considerably. Furthermore, the displacement achieved when expelling the plug and forming the enlarged base compacts and pre-loads the soils surrounding the base. Thus the end-bearing of a Franki pile in sands develops at much lower base deflections than that of a bored pile.