Dacheng viaduct in Ningxiang,Hunan province landed in limestone area with developed Karst and cave-in the surface. Considered the engineering geology condition, a project of hand-dug piles was presented, which was successful through several kinds of special treatment. Among of these, the most length of hand-dug pile was 70.8 meter .So long a pile like this was infrequent in our country.%大成桥高架桥位于宁横公路三标段灰岩区,岩溶发育,地面塌陷严重。综合现场工程地质条件,提出了在采用人工挖孔桩的方案,由于采用了特殊处理措施,取得了较大的成功。其中最深的人工挖孔桩达70.8 m,如此深的人工挖孔桩国内少见。
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