The excavator spiral drill is mainly composed of a drill rod, spiral blades, and a driving device. Drill rods are usually made of high-strength steel, which has sufficient strength and stiffness to withstand the pressure and torque during the drilling process. Spiral blades are welded onto the drill rod, and the soil debris is discharged from the borehole by rotation. The driving device is generally powered by a hydraulic motor to ensure that the spiral drill can efficiently perform drilling operations.