Driven or Displacement piles:-
They are usually preformed before being driven,jacked,scrwed or hammered into ground. This catogory consists on driven piles of steel or precast concrete and piles formed by driving tube or shells which are fitted by with a driving shoe.
The tubes or shells which are filled with concerte after driving also include in this category are piles formed by placing concrete as the driven piles are withdrawn.
Bored or Replacement piles:-
They require a hole to be bored first into which the piles is then formed usually of reinforced concrete. The shaft may be eased or uncased depending upon type of soil.
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