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Continuous flight augering (CFA), also known as auger cast piling, is a technique used in construction to create a concrete deep foundation.

Description

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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.[1] 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. Once initial piles are set with concrete, other shafts are augured between them, slicing into the original piles, with the new ones receiving rebar. The finished result is a continuous wall of reinforced concrete that aids and protects workers during excavation.[citation needed]

History

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Continuous flight auger has been used in the United Kingdom since 1966.[2][non-primary source needed]

References

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  1. ^ "London Piling | The No.1 piling contractors in London". London Piling | The No.1 piling contractors in London. Retrieved 2015-12-08.
  2. ^ "CFA Piling". Simplex Westpile. Retrieved 2015-07-21.

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or bore piles. Rigs can range from 100 short tons (91,000 kg) continuous flight auger (CFA) rigs to small air powered rigs used to drill holes in quarries

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(66 ft) deep. There are a mixture of driven cast in situ piles, continuous flight auger piles, and vibro concrete columns. The second tier holds 55,000

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this way are disturbed samples. Continuous Flight Auger. A method of sampling using an auger as a corkscrew. The auger is screwed into the ground then

Newport City footbridge

foundations are supported by thirty 35+1⁄2 inches (900 mm) diameter CFA (continuous flight auger) piles varying in length. The bridge structure is suspended on