Retrievable ring bit system can be used several times. This is made possible by the features on the ring bit that have been designed to reduce the friction against the soil, allowing an easy retrieval of the casing. Also, the large inner diameter of the ring bit makes this system ideal for drilling rock sockets through the ring bit.
The system is available from 114 to 1 524 mm casings and for all major shank designs. It uses Spiral Flush technology, offering class-leading safety in overburden drilling.
Download the pdf data sheet for detailed information and measurements.
Another situation to use the retrievable casing system is when the support from bedrock is not needed or it is not available. When the casing is lifted, the wet concrete flows into small cavities of the overburden, securing the pile with frictional forces as the concrete dries.