The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing s...The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamic model were established for quanti- tative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmenta- tion. The detonating network of non-electric duplication crossover was adopted for the safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Harm- ful effects were forecasted and controlled by integrated protective technologies. Specialization, cooperation, pre- cision, execution （SCPE） project management method was put forward for precision management. The key tech- nologies of precision demolition blasting can provide reference for similar proiects.展开更多
This paper presented the delay characteristics of relay point detonator used in multiple parallel initiation networks and proposed the simple formula to calculate expectations of relay point initiation time.Correspond...This paper presented the delay characteristics of relay point detonator used in multiple parallel initiation networks and proposed the simple formula to calculate expectations of relay point initiation time.Corresponding reliability standards were established based on the different scale of non-electric initiation network.A multiple parallel initiation network were created,which could not only avoid the occurrence of the viaduct rollover during dumping process,but also improve the reliability standard and realize the unlimited segmentation.Results could provide a good reference for the design of viaduct blasting initiation network.展开更多
文摘The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamic model were established for quanti- tative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmenta- tion. The detonating network of non-electric duplication crossover was adopted for the safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Harm- ful effects were forecasted and controlled by integrated protective technologies. Specialization, cooperation, pre- cision, execution （SCPE） project management method was put forward for precision management. The key tech- nologies of precision demolition blasting can provide reference for similar proiects.
文摘This paper presented the delay characteristics of relay point detonator used in multiple parallel initiation networks and proposed the simple formula to calculate expectations of relay point initiation time.Corresponding reliability standards were established based on the different scale of non-electric initiation network.A multiple parallel initiation network were created,which could not only avoid the occurrence of the viaduct rollover during dumping process,but also improve the reliability standard and realize the unlimited segmentation.Results could provide a good reference for the design of viaduct blasting initiation network.
