Significant increase of drilling performance can be reached when using a continuous flight auger.
A continuous flight auger drill is used to excavate a hole and concrete is injected through a hollow shaft under pressure as the auger is extracted. Reinforcement is then inserted after the auger is removed. This creates a continuous pile without ever leaving an open hole. Continuous flight augering can be used to construct a secant piled wall which can be used as a retaining wall or as shoring during excavation.
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