ROTARY AUGER BORED PILING
CONSTRUCTION TECHNIQUE & APPLICATION
Rotary rigs create the pile bore by removing the soil in sections, approximately between 1-3 meters long, until the design depth has been achieved. 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 breakdown.
In non- cohesive ground conditions, such as made ground and or granular layers, a steel temporary casing is screwed in to seal the top of the clay to prevent soil collapse or ground water inflow.
Rotary piling is generally used in dry stable soils and rocks.
SPEEDECK provide a variety of bored pile retaining wall solutions when provision for temporary and permanent support for basement excavations is required. We have the expertise and technology to ensure that ground movements are controlled and an economic solution is found.
The most common methods, secant and contiguous walls are discussed below. However further guidance and explanation of different techniques can be found in CIRIA guide C580.