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P. 8
Continuous Flight Auger (CFA)
• Piles are bored using drilling rig of internal diameter
allowing for casting the concrete till the required
depth.
• Casting of concrete starts with withdrawing the
drilling rig upwards.
• Capacity of about 100 ton.
Advantages: ease of changing lengths by cutting or
slicing the shell. Material costs relatively low.
Inspection possible.
Disadvantage: not feasible in hard soils or rock. Voids
in concrete may be created. Splicing problems after
concreting.
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