Cased CFA is a modified version of traditional CFA and combines the benefits of both rotary bored and CFA piling using a temporary segmental casing.
The combined technique can achieve better pile installation tolerances in terms of vertically and plan position with enhanced surface appearance.
What is Cased CFA piling used for?
The cased CFA system is particularly suited to contiguous and secant retaining walls as the temporary casing helps to improve vertical tolerances. The lead casing and auger are fitted with tungsten tipped cutting teeth providing superior cutting power to keep the pile vertical and the ability to cut into female piles to achieve watertight retaining secant walls.
Key capabilities:
- Rig loadings: 93.4 tonnes
- Pile diameter: 600 – 750mm
- Maximum depth: 22.5m
- Up to 4,400kN
What are the advantages of Cased CFA Piling?
- Quicker than traditional rotary bored piling methods
- A relatively quiet and low vibration piling technique
- Modern, hi-tech rigs including sophisticated onboard computers providing improved quality controls and records
- Improved vertical and plan tolerances
- Capable of drilling through man-made obstructions such as reinforced concrete
- Reduced concrete over break and wastage
- Limits flighting in poor soils
- Improved appearance of finished retaining wall
Common Uses
- Structural foundations across all construction sectors
- Suitable for clay, weak rock and water-bearing sand, gravel, and glacial till
- Secant and contiguous piled retaining walls and can be used in conjunction with temporary props and permanent anchors
- Slope stabilisation and retention to prevent slip and landslides
- Retention for deep excavations and basements close to adjacent structures
- Ability to achieve tight drilling tolerances adjacent to site boundaries
- Working next to buildings and homes and in environmentally sensitive areas
- Used across infrastructure projects including tunnelling, road or bridge construction and flood prevention
