Hydraulic casing oscillators are specialized tools used in foundation construction to drive and extract large diameter steel casings, particularly in challenging ground conditions. They are essential when the torque of a drilling rig's rotary is insufficient to handle the casing, especially for large piles or in high friction soil. These oscillators utilize hydraulic power to provide the necessary torque and force, often supplementing or replacing the drilling rig's capabilities.
Casing oscillators install and extract casing in challenging ground conditions. Working together with drilling equipment, oscillators facilitate simultaneous drilling and casing advancement. This process offers immediate support preventing shaft collapse and can effectively prevent groundwater intrusion.
Oscillators twist back and forth using oscillating force, as opposed to vertical force, to install casing into the ground. The twisting motion enables the oscillator to cut through obstructions and dense layers more efficiently.
Oscillators are ideally suited for:
-Caving conditions, such as loose sands and gravelly soil
-Dense strata and fractured rock
-Mud and muck
-Drilling next to existing structures
Since casing oscillators do not rely on hammering or vibration to install casing, they can reduce the impact on surrounding areas. This is critical when drilling in sensitive areas or near existing structures.
Cased Drilled Shafts are required when ground conditions are so unstable that drilled holes can not safely be stabilized with drilling slurry or where lose of ground must be controlled. Casing can be temporary or permanent steel pipe which provides a 100% stable excavation for the full length of the drilled shaft.
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