We utilise a state of the art rig fleet which are fully instrumented with computerised pile monitoring systems and capable of operating in close proximity to other buildings and structures.

Each rig can be setup to suit different piling requirements, our main rig setup is for CFA piling. In CFA Piling mode the rigs can install piles up to depths of 28 metres and can offer typical pile diameters in the range of 300 - 1200mm.

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Our in-house design team can design the CFA piles to meet your loading requirements. To determine the diameter and depth of pile required they will use the site investigation report. This report contains various information about the site including the boreholes that show how the soil strata changes with depth.

If your site has no soils information you will require a minimum of one borehole for us to undertake a design. Please contact us with your requirements as we can arrange this service for you.

From the soils information the design team will produce a formal design package using recognised CFA design parameters and standards to provide the pile depths, diameters and reinforcement required.

This package can be issued to your engineer and the relevant local authorities, as necessary.





CFA Pile Designs Available:

• Bearing Piles: Compression, Tension, Horizontal Loadings
• Piled Retaining Walls: Secant and Contiguous

With CFA Piling the flight auger is drilled into the ground to the required design depth. The auger is withdrawn whilst concrete (designed to a specific mix) is pumped through the hollow stem.

This process is fully monitored by the instrumentation system. Upon completion of the concreting phase, reinforcement is inserted into the pile shaft.

The CFA piling system is very versatile, being suitable in both stable and unstable ground conditions. It is capable of dealing with the presence of ground-water.

With this type of pile there is no open bore at any time. The upward movement of soil at all times and the advance of the rising concrete prevent the development of preferential flow paths or downward transportation of contaminants.

The CFA process is both quiet and relatively vibration-less making it ideal for environmentally sensitive situations and where piling is to take place close to neighbouring properties and services.

The pile testing regime adopted for any site will vary depending on the following factors:

• Quality of the site investigation
• Design factor of safety
• Number of piles
• Consistency of the geology
• Any specific contractual requirements

Maintained load and sonic integrity testing may be used to demonstrate pile performance and integrity respectively.

The computerised monitoring systems on board each rig provide a colour touch-screen computer. This computer enables the piling process to be continuously monitored by our fully trained operators.

The accuracy and traceability provided by the system enables quality assurance on each pile.

Continuous Flight Auger (CFA) Piling is one of the most widely adopted piling techniques due to its low impact on the surrounding environment. It is ideal for use near any environmentally sensitive situation including but not limited to listed buildings, water treatment works and contaminated sites.

As one of the countries leading providers of CFA piling Rock and Alluvium can offer many innovative piling solutions, allowing for instance the installation of complex Piled Retaining Walls.

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