CFA Piles

CFA piling is used across transport, civil and water infrastructure projects. Its low-vibration installation method makes it particularly useful in locations where noise and ground disturbance need to be carefully controlled.

Common CFA piling applications include:

• Structural foundations: Transferring loads from commercial buildings, residential developments, industrial facilities and other structures into suitable bearing strata.
• Contiguous and secant pile walls: Creating temporary or permanent retaining systems around basements, excavations and site boundaries.
• Deep excavations: Supporting excavation faces where surrounding buildings, roads or services limit ground movement.
  Slope stabilisation: Supporting unstable slopes and reducing the risk of slips or ground movement, often alongside ground anchors or other retention systems.
• Tunnelling support: Supporting shafts, portals, retaining structures and associated infrastructure.

CFA piles can be installed through many clays, silts, sands and gravels, including water-bearing ground where conditions are suitable.

The final piling method should always reflect the geotechnical conditions, required pile capacity and presence of rock or obstructions.

CFA piles can work across a wide range of soils, but ground containing large cobbles, boulders, major obstructions or hard rock can make conventional CFA drilling unsuitable or uneconomical.

• Potential limitations include:
  Large cobbles and boulders: These can obstruct the auger, slow penetration or prevent the pile from reaching its required depth.
• Hard or competent rock: Conventional CFA augers may not achieve the required penetration, particularly where a substantial rock socket is needed.
• Buried obstructions: Old foundations, concrete, masonry and other unidentified obstructions can interfere with drilling.
• Highly variable ground: Rapid changes between soft soil and very dense or hard layers can require careful drilling control to avoid excessive soil extraction.
• Contaminated ground: CFA piling may still be technically suitable, but contaminated spoil can require controlled handling and disposal, which may affect the choice of piling method.

However, large cobbles, boulders and difficult drilling conditions do not automatically rule out CFA piling.

The geotechnical investigation and available piling equipment will be assessed before selecting the final method, as conventional bored piles, cased bored piles, micropiles or another foundation system may be more suitable.

Choose a CFA piling contractor with proven experience, strong engineering capability, suitable piling rigs, effective quality control and a clear understanding of your site’s ground conditions.

Key factors to consider include:

• Relevant CFA piling experience: Similar project scale, pile sizes, depths and ground conditions. CFA piling requires precise control of drilling, concrete placement and reinforcement installation.
• Engineering capability: Ability to align geotechnical data, structural loads and construction methodology. In-house design can improve buildability on Design and Construct projects.
• Suitable plant and equipment: Correct rig capacity (torque, pull-down, extraction and auger length) plus suitability for site access, headroom and working platform conditions.
• Quality assurance: Control of pile position, depth, concrete volume/pressure, auger extraction and reinforcement placement. CFA success depends on process control, not just depth.
• Safety systems: Strong WHS systems, competent operators, safe rig procedures, and compliance with licences, approvals and exclusion zone requirements.
• Local ground knowledge: Familiarity with Australian soil conditions to anticipate drilling issues and select appropriate methods and equipment.
• Clear scope and pricing: Transparent inclusions beyond the piling rate, including mobilisation, concrete, reinforcement, spoil removal, testing, trimming and surveying.
  Project coordination: Ability to manage interfaces with concrete supply, reinforcement, spoil removal and other trades to maintain programme.

At The RIX Group, we combine specialist CFA piling capability with engineering expertise, Design and Construct experience and a diverse modern piling fleet.

Contact us for a quote today.

Yes. We tailor each CFA piling strategy to the ground conditions, structural loads, pile requirements, site access and surrounding structures.

Before installation, our team reviews the available geotechnical information and project requirements to determine factors such as pile diameter, depth, reinforcement, founding conditions and suitable piling equipment.

We also consider practical site constraints, including:

• Groundwater conditions
• Existing buildings and structures
• Underground and overhead services
• Rig access and working platform requirements
• Concrete supply and placement
• Reinforcement handling
• Spoil removal
• Noise and vibration requirements
• Construction sequencing and programme

This site-specific approach allows us to select a CFA piling solution that meets the structural and geotechnical requirements while accounting for how the piles will actually be installed.

There’s no standard duration for a CFA piling project. The overall timeframe depends on the number, diameter and depth of the piles as well as the ground and site conditions.

Before mobilisation, we will review the pile schedule, ground conditions and site constraints to develop a realistic piling programme that aligns with your wider construction schedule.

Yes. We can coordinate CFA piling works with principal contractors, consultants and other specialist trades on major infrastructure and construction projects.

Early planning of these interfaces helps minimise trade clashes, protect completed works and keep the piling programme aligned with key project milestones.

Yes. We install CFA piles throughout Australia and the Asia Pacific.

Contact our piling specialists today to determine the right technique for your site and project requirements.