Simplex Westpile has long been renowned for its expertise in Rotary and CFA Piling and its innovative approach to the design and construction of retaining walls.
Simplex Westpile can offer Cased CFA piling with an effective spoil management system.
Cased CFA piling was developed to improve on traditional CFA techniques and to be able to offer certain benefits of rotary bored piling without the loss of production that would historically have been the case.
Cased CFA techniques can:
- Achieve enhanced verticality compared to normal CFA techniques
- Match productivity levels associated with CFA piling
- Prevent flighting of loose soil during drilling
- Safely collect the pile spoil at ground level in a controlled and safe manner
- Drill hard strata that could obstruct traditional CFA rigs
Technique:
The rotary drive units for the casing and the augers rotate in opposite directions but are connected so they operate at the same level. In this manner the casing and augers are drilled into the ground at the same time. The counter rotation allows spoil to flow to the top of the auger string and out of the casing. The telescopic spoil handling system then allows the excavated soil to fall to the ground within a steel tube.
Concrete is pumped through the hollow stem of the auger and cages are installed once the pile is complete.
Bespoke instrumentations systems are used to monitor and control pile construction in a similar manner to traditional CFA piling.
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