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Concrete is fed in
through the pipe at
the back of the rig,
through the pipe and
down the centre of the
hollow stem of the
auger
The CFA penetrates through
the ground until it reaches the
required depth
The CFA penetrates through
the ground arisings are
brought to the surface. The
strata brought to the surface
can be inspected and then
removed
As the auger is removed,
concrete is pumped, under
pressure, down the central pipe
Once the auger is fully removed
the reinforcement cage can be
pushed into the concrete bore
Figure 3.51 CFA piles.
Continuous flight auger
Arisings
brought to the
surface
Photograph 3.8 CFA (http://www.roger-bullivant.co.uk).