The full-casing method is widely used in Taiwan for installing large-diameter piles in typical soil conditions. A casing oscillator drives rigid drilling casings equipped with cutting teeth at the bottom to excavate the soil. Soil inside the casing is removed using tools such as hammer grabs or buckets. Once the design depth is reached, the reinforcement cage is installed and the pile is cast in place.

- Suitable for strata prone to collapse—such as the gravel layers in Taichung—as the casing provides stable borehole support
- No polymer stabilizing fluid required, resulting in lower soil moisture content and reduced disposal costs
- Versatile for various applications, including secant piles, obstruction removal, and other complex or combined construction tasks