桥梁挖孔桩开挖具有断面小、作业面窄、爆破难度大、安全隐患大等特点，通过对三（穗）凯（里）高速公路工程第六合同段展架3号特大桥挖孔桩施工技术进行研究总结，提出了适合孔桩开挖的钻爆设计及安全、质量控制要点。

The hole excavation of the excavated belled piles of bridge works has such features as small crosssection, narrow working space, difficult blasting and high safety risks. Taking the construction of the excavated belled piles of No. 3 Zhanjia extralarge bridge on No. 6 contract section on Sansui～Kaili highway, the paper presents the drilling and blasting design of the excavation of the excavated belled piles, as well as the safety and quality control points of the excavated belled piles.