Auger Displacement Piling across the UK and Ireland.
With Landfill Tax Directive costs rising and the increasing proportion of brownfield sites being developed, the financial implications of the choice of deep foundation methods are rising all this time. Research has therefore been focused on the reduction or practical elimination of arisings from the pile or foundation installation.
Auger Displacement piling is an effective way of reducing the spoil arising from the bored pile by a factor of around 90% when compared to comparable CFA methods. In suitable soils, the auger displacement tool is able to quickly and effectively place augered piles with minimal spoil and little effect from variable groundwater levels. The method of placing is similar to CFA methods, the displacement auger has a hollow stem through which concrete is placed directly into the base of the pile bore at the required depth.
The auger is bored into the ground, where the conical nature of the tool progressively displaces and 'crowds' the soil against the side of the bore, where it is then consolidated by the toughened steel wear plates on the cylindrical part of the auger tool. The bore is continued until the required depth, resistance to boring, or refusal is reached.
At this depth, guided by the sophisticated auger instrumentation in the drivers cab, the auger is gradually withdrawn, at the same time concrete is pumped down the auger's hollow stem. This ensures that no part of the bore is unsupported, and therefore a consistent column of sound concrete is formed in the pile bore. The pile is finished in the normal manner, the top level being cleared by an attendant excavator, and the required reinforcement cage placed in the pile to the correct level.
Commonly, a small volume of spoil is brought to the surface with the auger, generally adhering to the narrower section of the auger stem above the tool.
Contact us for an assessment of whether the method is suitable for your proposed site. If applicable, we may suggest a construction of a trial pile at the site in order to confirm the suitability of the technique, and indicate the likely load carrying capacity of the piles produced. There is no better way to firm up your Clients costs on foundations in the early stages of his investment planning.
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