Reverse-circulation cast-in-place piles are one of the most commonly used methods for installing large-diameter piles in typical soil conditions in Taiwan. A tri-wing drill bit cuts through soil or rock, and a high-pressure pump removes the cuttings together with the stabilizing slurry through a hollow drill pipe. The continuous circulation of the stabilizing fluid maintains the water level in the borehole, preventing collapse during drilling. Piles formed through this process are referred to as cast-in-place piles.
Reverse Circulation Drilling (RCD) bored piles are among the most commonly used methods for installing large-diameter bored piles under typical soil conditions in Taiwan. The rotary drill bit cuts through soil and rock, while a suction slurry pump removes cuttings together with the stabilizing slurry through drill pipe. The continuous circulation of the stabilizing fluid maintains the borehole water level and prevents collapse during drilling. Piles constructed using this method are categorized as cast-in-place reinforced concrete piles.

- Locally manufactured high-efficiency S-500/600 reverse-circulation drilling rigs for improved drilling productivity
- Polymer-based stabilizing fluid allowing rapid sedimentation and faster slurry discharge
- Verticality control system: tri-wing drill bit equipped with stabilizer plates for higher drilling accuracy
- Rock-penetration capability: tungsten-carbide teeth and heavy-duty drill pipes improve applicability across strata
- Enhanced bearing performance: efficient borehole formation and less clay cake on the borehole wall contribute to improved shaft friction resistance.