ENTECO has developed and designed very high performance CFA rigs provided with high torque rotary tables, crowd and extraction force winches, large diameter facility and long stroke mast.
CFA pile, also known as auger cast pile, is formed by drilling into the ground with a hollow stemmed continuous flight auger to the required depth or degree of resistance. A high slump concrete mix is then pumped down the stem of the auger. While the concrete is pumped, the auger is slowly withdrawn. The spoil on the flights is recovered by means of a hydraulic auger cleaner applied to the mast of the rig. A shaft of fluid concrete is formed to ground level.
A reinforcement cage is placed along the formed and still fluid concrete column. Longer reinforcement cages can be installed by an auxiliary vibrator.
Application field:
- Mud, clay and sand, also in very dense formations.
- Possibility to socket into fractured rock
- Secant piles possibility
Features:
- Faster production compared to kelly auger piles
- No fluids to sustain the pile are required
- No vibrations or noise produced
- Full control of executed pile features by means of electronic devices
- Data recording of the pile and graphic rendering
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