C.S.P. and C.A.P. Piles

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The C.S.P. or C.A.P. pile can be simply considered a lined C.F.A. pile.

C.A.P. piles are single piles, while C.S.P. piles are secant piles.
Secant piles are typically executed alternately, with an unarmed primary pile and a secondary pile that interlocks with the two adjacent primary piles, executed with normal reinforcement. This technology represents a valid solution for creating impermeable barriers.

The drilling process is identical to C.F.A., with the only difference being the coaxial insertion of a casing tube along with the auger. The rotation of the auger and the casing tube is independent, with one rotating in the opposite direction to the other. Vertical translation also occurs independently.

The concrete pouring into the borehole is done similarly to C.F.A. piles, through the hollow core of the auger, as well as the immersion insertion of the reinforcement, which occurs after the completion of pouring.
For this reason, the use of special SCC (self-compacting concrete) is essential, with aggregates having a maximum diameter of 1.5 cm and additives that slightly delay the onset of the setting phase and prevent disintegration. This allows for the immersion insertion of the reinforcement cage due to its own weight.