Double-walled casings are used to support boreholes in unstable soil conditions. The casings and casing joints are designed for the high torques generated by the BG machines or casing oscillators.

Characteristic features:

•  Flush drill string

•  Interchangeable conical bolts

•  Variable lengths

Casing drive adapters transfer the torque from the rotary drive to the casing string. Two types of bolt connection systems with the casing string are available:

•  Mechanical connection (bolts are fitted manually by rig operator)

•  Automatic connection (hydraulically operated locking system)

Casing shoes are key components of a casing string, especially when working in hard soil conditions or when constructing bored pile walls. Casing shoes are available either with a welded cutting ring fitted with weld-on teeth or as a cutting ring equipped with replaceable blocks.

Special features:

•  Optimal cutting properties with ideal lateral cutting capability both inside and outside 

•  Excellent material flow at the teeth / long service life

•  Easy on-site maintenance