2014, Volume 16, Issue 11
Strategic Study of CAE >> 2014, Volume 16, Issue 11
Key technologies of precision demolition blasting of ultra-long urban viaduct in complicated surroundings
1. Wuhan Municipal Construction Group Co. Ltd.，Wuhan 430023，China；
2. Wuhan Blasting Engineering Co. Ltd.，Wuhan 430023，China；
3. Changjiang River Scientific Research Institute，Wuhan 430014，China
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Abstract
Key technologies of precision blasting were put forward based on characteristics of urban viaduct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamics model were established for quantitative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmentation. The initiation network of non-electric duplication crossover was adopted for safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Adverse effects were forecasted and controlled by integrated protective technologies. Specialization cooperation，precision，execution（SCPE）project management method was put forward for precision management. Key technologies of precision demolition blasting can provide reference for similar projects.
Keywords
viaduct ; blasting demolition ; precision blasting ; instability model ; initiation network ; adverse effects control
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