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P.R.D(Percussion Rotary Drill)
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It is one of base supporting on ground structure.
It will be adopted when can secure the bearing force.
It is section that has 600 mm -1000mm diameter which is smaller than R.C.D Pile.
Can be applied to various methods like Top Down method, to prevent activity of inclined plane, various sediment layer and base of rock bed.
The damage of surrounded structures is minor by using low pressure air.
It is method keep out the excavated soil by compressed air and excavates ground by percussion rotary type running hammer bit attached on pile driver by using compressed air.