Application for Vacuum-aided Mud-jack Technology of Precast Box Girder in Harbin-Dalian Passenger Railway Line

During the construction of post-tensioning precast box girder in Harbin-Dalian passenger railway line,the vacu-um-aided mud-jack technology was used.Through expounding the quality control measure which was used for actual construc-tion,this paper introduces the experiences and measures of quality control for vacuum-aided mud-jack technology.The result shows that vacuum-aided mud-jack technique can ensure the quality ofmud jacking by pore canal of post-tensioning box girder.