大直径超深钻孔桩冲击成孔工艺浅析

Tentative analysis on impact pore forming process of large diameter exceed deep drilling pile

以武汉二七长江大桥工程为例,介绍了冲击钻在大直径超深钻孔桩施工中的应用,阐述了改进后的冲击钻持续正循环钻孔工艺,指出新工艺成孔效率高,成孔质量及后期成桩质量符合相关要求,经济性好,值得进一步推广应用。

Taking Erqi Changjiang Bridge in Wuhan engineering as an example, this article introduces the application of impact drill in large di- ameter exceed deep drilling pile, and expounds continuous positive cycle drilling process of improved impact drill. And then, it points out that： the new pore-forming technology is high efficient and pore-creating quality and post pore-forming quality conforms to relevant requirements, and it has great economic benefits. In a word, this new technology is worth further promoting.