Drilled piles are particularly effective for penetrating rocks, boulders, general obstructions and mass concrete. A variety of drilling techniques are employed using concentric and eccentric overburden drilling systems as well as more conventional duplex methods. A water or air flush is used depending on the ground conditions. In addition to these, foam, grout, mud and polymer are available. The pile depth is normally predetermined by detailed pile design calculations. Once the required depth is reached the bore is filled with grout. A tremie pipe is used where water is present in the bore. Typically a single bar is inserted on completion. A reinforcement cage can be incorporated if required. These piles are suitable in most ground conditions and are particularly appropriate in problem ground or when a rock socket is required. Advantages of drilled piles
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