Sectional Flight Auger Piling
SFA Piling description .
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Sectional flight auger piles (SFA) are formed by boring into the ground and pumping concrete or grout through the stem of the auger to leave behind a wet cast column. The required reinforcement is then plunged into the pile. The installation of SFA piles creates little noise and is almost vibrationless. It is therefore the preferred option when piling in sensitive areas or adjacent to sensitive infrastructure.
The piles are suitable for most soil types and working environments. The lower range of pile diameters (250mm – 300mm) can be installed with small scale plant to depths of around 12.0m, whereas larger diameter or longer piles will require a more powerful and therefore larger piling rig.
- Advantages
- Low noise and almost vibrationless
- Can be used in almost any ground conditions.
- Small scale plant can be used for smaller pile diameters.
- Ability to support considerable compressive, tensile and shear loading.
Pile Sizes Available
We install 250mm, 300mm, 350mm and 400mm, 450mm 500mm and 600mm diameter SFA piles.
Pile capacity
Installation Process.
The installation of sectional flight auger bored piles can take two main forms, either hollow stem auger or solid stem auger. The solid stem auger method can only be used in unsaturated and self-supporting soils i.e. where the augers can be withdrawn without the pile bore collapsing or filling with water. Clay soils usually provide the perfect conditions for the solid stem method. The hollow stem method is more versatile with regards ground conditions. In this method, concrete or grout is pumped through the hollow stem of the auger as it is being withdrawn to leave behind a wet cast concrete column.
Both techniques begin by boring into the ground with a lead auger, known as a boring head, followed by progressively adding segmental augers lengths until the design depth has been achieved. The augers are withdrawn and removed in the same manner. In the solid stem method, the augers are withdrawn, and the bore remains open to receive concrete once enough pile bores have been created to warrant a concrete delivery. Pile reinforcement can be placed either before or after the concrete has been placed. In the hollow stem method, concrete must be pumped through the auger stem when withdrawing the auger. Pile reinforcement must then be plunged into the wet concrete.
Solid Stem Method.
- Hollow stem method
- Rapid installation allowing cost and programme savings.
- Site remains clean as no displacement of groundwater or excess concrete.
- Less reliant on concrete delivery times and less requirement for part loads
- Pile reinforcement can be placed prior to concrete delivery.
- Versatile – can be used in most ground conditions.
- No requirement for tremie systems as concrete is placed from the pile base upwards.
- Greater quality control – less risk of pile base contamination/soil softening.
Reinforced Concrete and Underpinning
In addition to piling, we undertake all types of reinforced concrete works such as ground beams, floor slabs and pile caps. We can also provide costs for setting out, excavation works, piling attendances and spoil removal.
We design and install a range of underpinning systems including traditional underpinning, cantilever beams, knuckle piles and internal piled rafts.
Talk to us about SFA Piling
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