Rotary Auger Bored Piling
The rotary auger bored piling technique utilises a short flight auger attached to the Kelly bar of the piling rig and creates the pile bore by removing the soil in short sections, using augers approximately 1 to 3 metres long, dependent upon the hole size, until the design depth has been reached. In non- cohesive ground conditions, such as made ground and or granular layers, a steel temporary casing is inserted and sealed into the top of the clay to prevent soil collapse or ground water inflow. This casing is either screwed in using the rig or vibrated into place using ancillary service crane and specialist vibrator equipment. A reinforcing cage is then installed into the open bore and before concrete is placed in via a hopper and or delivery tube.
Rotary piling is generally used in dry stable soils and rocks.
We have rigs that are capable for forming piles 300 to 1200mm in diameter and to a depth up to 40.0 metres. The piles are constructed using self -erecting hydraulic rigs 30 to 70T the lighter variants being particularly well suited to small sites meaning that most sites are accessible with our equipment.