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Double-walled casings are used for stabilising boreholes in collapsible soil conditions. Casing and joints are designed for resisting the forces of BG-rigs or casing oscillators.
Main features of the casing system are:
Casing drive adapter transfer the torque from the rotary drive
3 types of bolt connection systems are available: mechanical connection (bolts are fixed manually), semi-automatic with crank handle, automatic locking device
Casing shoes are important key elements on a casing string, especially when working in hard soil conditions or when constructing secant pile walls. Cutting rings on the cutting shoe are supplied either with weld-on teeth or with replaceable cutting teeth.