Bored Piles

Bored Piles

Bored piles founded in rock provide an effective means of minimising foundation settlement and can be installed with little to no vibration. Vibropile has a large range of equipment available for the execution of bored piles ranging from heavy duty, crane-attached units to modern all-hydraulic tracked machines.

Soil and/or rock is removed using purpose designed drill tools. These include soil and rock augers, drilling buckets and core barrels, which can reach depths of up to 80 metres and range in diameter from 400mm to in excess of 3 metres. Various methods are available to support the sides of the bored piles during construction. These are selected in accordance with the type of formation being drilled, the ground water regime encountered and the environmental constraints on site. Shaft support methods  available include:

  • Drilling under water
  • Drilling under polymer fluids
  • Drilled temporary casing
  • Permanent liners
  • Drilling under bentonite
  • Vibrated temporary casing
  • Oscillated temporary casing

The load capacity of bored piles is a function of the installation technique chosen, the prevailing ground conditions and the structural capacity of the pile shaft. Bored piles become particularly efficient where resistance to high loads or bending moments is required, such as those induced by wind and  earthquake loading. In these circumstances the larger diameters available, combined with appropriate steel reinforcement cages, provide the required structural strength and geotechnical performance. Vibropile is one of the few piling  contractors with both the plant and experience to tackle high and very high strength rock, using our custom made buckets, core barrels and roller cutter barrels. We have drilled up to 300PMa rock and provided economical solutions in ground conditions many contractors would consider unsuitable for conventional piling techniques.