When high load demands and complex ground conditions are expected, rotary piling – also known as large diameter piling – provides a robust foundation solution. This technique enables the installation of larger diameter and greater depth geometry than methods such as CFA, making it ideal for challenging ground conditions that are difficult to drill.
Engineered to perform reliably in challenging environments, the rotary piling technique offers flexibility across a range of ground conditions. When combined with capable rigs and equipment, rotary piles can reach depths beyond 70 metres. By incorporating full-length reinforcement within the pile bore, this method enables significant tension load to be transferred into the ground and optimises load-bearing capacity throughout the pile, enhancing overall structural integrity. We also have experience in in-situ coring of obstructions utilising this technique, which can ensure the project outcomes align with design expectations on projects where the desired column configuration or basement layout couldn’t otherwise be achieved.
Rotary piling involves the use of specialist tools including buckets and augers on a kelly bar, selected to suit the ground conditions. These tools bore into the earth in stages, removing spoil progressively until the design depth is achieved. Temporary or permanent casings are installed to stabilise the bore through less stable ground layers where required by design or environmental constraints.
We also offer specialist rotary capability tailored to site-specific needs, including large diameter hydraulic casing oscillators for significant sections of unstable soils and coring with minimal ground disturbance, plunge columns to enable top-down construction, under-reamed piles for heavy loads and drilling fluids such as polymer or bentonite to stabilise bores.
