Construction technique & application
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete. Where piles are used for deep basements it may be permissible to leave the concrete at a low level in order to reduce pile trimming.
Rotary piling is generally used in dry stable soils and rocks. However in cohesionless soils, piles may still be formed with the use of casing or drilling fluid to support the bore.
Plant & equipment
We have a wide variety of hydraulic and crane mounted rotary rigs ranging from 2.5T to 65T. This provides pile sizes ranging from 250mm to 1800mm and up to 66m depth. The short mast height and small footprint of some of the rigs mean that most sites are accessible with our equipment.