SH25H型液压风动冲击钻机在大口径硬岩钻孔灌注桩施工中的试验研究

Experimental Study on SH25H Hydraulic and Pneumatic Impact Drill in Large Diameter Bored-grouting Pile Construction in Hard Rock

摘要:

根据京沪高速铁路徐州东站大口径嵌岩灌注桩工程，试制SH25H型液压风动冲击钻机﹑采用气动潜孔锤空气正循环组合钻进工艺，结合捞砂桶排渣，摸索总结出一套针对硬岩地层的干式成孔新方法，钻进效率及钻孔质量显著提高，为大直径成孔施工增添了一种新的方法。

Abstract:

By the large diameter rocksocket boredgrouting pile project in the construction of Beijing-Shanghai highspeed railway, the SH25H hydraulic pneumatic impact drill was trial manufactured with the pneumatic DTH and positive circulation rotary drilling technology, and chip removal was carried by bailing bucket. A new method for dry borehole drilling was explored and summarized with high drilling efficiency and high quality of borehole.