Piles are used as foundation supports for buildings in case where the underground is non-bearing and it is rammed/driven into the ground with a heavy device until an adequately stable, load bearing, mineral based layer is attained.
They have an inner and outer spiral reinforcement in order to be bear the lateral pressure exerted by the ramming device and are also produced as prestressed elements. The head of the pile is flat, the foot is pointed. A perfect example ,which demonstrates the capabilities of pile foundations, is the city of Venice, which was founded throughout the centuries on countless piles.
