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Bored piles are circular section reinforced cast in situ elements. A number of different drilling techniques can be used for their installation. Piles transfer structural loads from the surface to soil strata with good bearing capacity. When arranged in a line they can form a retaining wall for an excavation or a step in the terrain, or they can act as a barrier to groundwater. The length, diameter, and spacing of individual piles can be tailored to match the desired application. Depending on structural requirement, piles may be fully or partially reinforced. The most widely used method of constructing bored piles is rotary drilling.
The two main drilling methods are: