PZ系列组合式牙轮钻头在大直径嵌岩桩施工中的应用效果

Application of the PZ Series Composite Roller-Type Bits to the Drilling of A Large -Diameter Batholith -Inserted Pile

本文通过大口径桩孔基岩钻进，探讨了ＰＺ系列组合式牙轮钻头结构特点、合理钻进参数的确定及碎岩机理。工程实践证明，牙轮钻头是我国目前大直径桩孔嵌岩施工较为理想的工具，应用效果良好。

his paper reports on the application of PZ series composite roller -type bit to the drilling of a largediameter batholith -inserted pile, and focuses on the discussion of structures of the PZ series composite roller -type bits, the determination of rational drilling parameters and the rob- crushing mechanism of the bits. It is concluded that the roller- type bit is a more ideal tool of drilling a large diameters batholithinserted pile at present in China. The roller- type bit has produced good results in the construction of pile foundation.