Rotary casing tools for piling consist of casing twister, casing pipe and casing shoes which are used in the construction of deep foundation elements, such as drilled shafts (also known as caissons or bored piles). These tools are employed to advance and install casings into the ground during the drilling process. Casing pipes are typically used to maintain borehole stability, prevent soil collapse, and provide structural support for the excavation, particularly in loose or unstable soil conditions. Rotary casing tools facilitate the insertion of casing pipes while drilling continues.

How Rotary Casing Tools for Piling Work:

Casing Pipe Installation: The rotary casing is attached to the drilling rig's drill string, which is used to advance the drilling process. 

Drilling Operation: As drilling progresses, the rotary casing tool is used to simultaneously advance the casing pipe into the ground. The rotary action of the tool helps cut through the soil or rock formations, allowing the casing to be inserted.

Casing Advancement: The rotary casing tool's design, which often includes a cutting casing shoe with bit WS39/WS46, helps break up and displace the soil or rock as it advances. This displacement ensures that the casing pipe is effectively driven into the ground.

Control and Guidance: Operators control the advancement and rotation of the casing pipe using the drilling rig's controls. They also monitor the alignment and verticality of the casing pipe to ensure that it is installed correctly.

Casing Removal: Once the desired depth is reached, the rotary casing tool is disengaged from the casing pipe, and the casing pipe is typically left in place as the foundation element is constructed within it. In some cases, the casing pipe may be partially extracted, depending on project requirements.