Objective To address the technical challenges in drilling construction of large-diameter steel pipe piles under low-headroom conditions, a low-headroom pile formation construction technology is proposed for the steel pipe pile foundation project of Tianhe Road Station main structure on Guangzhou Metro Line 10, aiming to overcome the limitations of traditional construction methods in low-headroom environments.

Method A low-headroom pile formation construction technology combining a full-casing rotary drilling rig and a cluster-type ring-cutting DTH（down-the-hole）hammer is proposed. By optimizing equipment configuration and construction processes, the efficient pile formation in low-headroom environments is achieved. The full-casing rotary drilling rig provides a stable drilling platform and efficient cutting capability, while the cluster-type ring-cutting DTH hammer enhances hole diameter adaptability and drilling efficiency through the combination of multiple single DTH hammers. The proposed low-headroom pile formation construction technology covers the design and configuration of equipment and tools, the detailed planning of the hole-forming construction process, as well as quality assurance measures during the construction.

Result & Conclusion  The proposed low-headroom pile formation construction technology enhances construction safety, improves hole-forming efficiency and quality, and solves the construction challenges of large-diameter steel pipe piles in limited working spaces. This technology not only provides successful practice for the steel pipe pile foundation project of Tianhe Road Station main structure on Guangzhou Metro Line 10, but also offers valuable technical reference and insights for pile foundation construction under similar complex geological conditions.