Abstract: In special condition，the application of man-dug piles for bridge foundations may gain not only the construction quality，but also the preferable economy benefit．Analysis is briefly made to structural design of the man-dug based on the bridge construction in Chongqing these years，especially the design and construction of Hongyangang bridge on Jiang-He speedway．

Key words: man-dug pile, structural design , calculation of pile foundation

摘要： 桥梁桩基在特定条件下采用人工挖孔桩，既可保证施工质量，又可获得较好的经济效益．根据重庆市近几年桥梁施工，特别是正在施工的江合高速路上的红岩岗大桥人工挖孔桩的设计与施工，对人工挖孔桩的设计做了简要的计算与分析．

关键词: 人工挖孔桩, 构造设计, 桩基计算