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DEMOLITION OF THE PIERS OF OLD RAILWAY BRIDGE ACROSS SONGHUA RIVER BY UNDERWATER BLASTING

QI Shi-fu~1,LI Shang-hai~2,HU Liang-xiao~2 (1.Engineering Institute,Engineering Corps,University of Science and Technology, PLA.,Nanjing 210007,China; 2.Haerbin Hengguan blasting Engineering Limited Corp.,Haerbin 150036,China)  
After the superstucture of the old railway bridge across Songhua river was demolished,the piers located in the main channel were demolished by the blasting method combining long holes with short holes.The pier structure and the placing of steel bars were proved by use of borehole surveying.In this paper,determination of blasting scheme and selection of the powder factor for long-hole blasting in water were expounded.The parameters of blasthole pattern,the structure and parameters of charges and priming method were introduced.At the same time,the prediction of blasting safety was carried out.
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