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Rotary/auger bored piles
150 - 600mm diameter to 24m deep
This piling method is ideal for use in cohesive soils. The rotating auger screws into the strata reaming out the soil. Once the required depth has been achieved the steel cage and concrete is placed.
These highly mobile rigs are economic to use on large open sites with cohesive ground, and on some chalk or sand, which have good access. Smaller models are suitable for internal use. (The example shows the pile being formed using temporary casing to prevent sides collapsing or water entering the open bore).
As a rotary auger causes minimal vibration it is ideal for use next to buildings or underground services. Tremmie techniques can be used if water is present.
A number of our rigs can install this type of pile and the choice is dependent on pile load, size of site and the number of piles to be installed. We have smaller rigs such as G.P. Services, Kitten and Klemm for use on resticted sites. If piles need to be formed through loose or wet strata a temporary cased, continuous flight auger or driven piled solution may be preferable.
The vast range of our piling rigs means that we can offer a short lead-in time and an economical solution for most projects. Our auger bored piling capability includes:
150 mm - 350 mm diameter to 16m
This mini auger bored machine can operate in restricted access (760 mm wide) and limited headroom (2.40m). It is used to bore piles in cohesive stratas. We also have an electrical version for environmentally sensitive projects. The handy rig shown can operate in headroom of just 4m and its 1.80m width allows it to manoeuvre through narrow gaps to get on site. Yet it can still bore piles up to 17m deep.
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250-450mm diameter
This system is generally used in cohesive soils, although it can sometimes be used in chalk or sand with a clay content. The Klemm 708 piling rig detailed here offers fast production whilst being compact enough to work in small areas and locations
Large diameter auger bored
350-600mm diameter
This rig is generally used on larger sites. It can bore piles in clay, sandy clays and chalk to diameters of up to 600 mm and up to 20m deep. If fill exists or granular materials overlay the cohesive layer, allowing water to enter the open bore, temporary casing can be positioned to exclude this until the concrete is poured. The casing (maximum depth 3.50m) is then removed.
Auger Bored Pile - Small Diameter case study
Auger Bored Pile - Medium Diameter case study
Auger Bored Pile - Large Diameter case study
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