Blasting Demolition Of Prestressed Reinforced Concrete Bridge Under 500KV High-Pressure Line

With the rapid development of transportation industry in China,the construction of highway bridges has made obvious achievements,but some inevitable bridges will face demolition for various reasons.With the advantages of safety,efficiency and economy,blasting demolition technology has become the first choice of bridge demolition method.In view of the different structure of the bridge to be demolished and the surrounding environment,it is necessary to draw up the blasting construction scheme,and the choice of blasting parameters becomes particularly important.If the designed parameters are unreasonable,it may bring serious consequences.Guizhou Tianzhu Huangping Expressway Town far North Interchange turn A main Bridge needs to be demolished by blasting due to line change.According to the blasting demolition of the bridge as an example,the blasting demolition of the bridge in complex environment is studied.According to the technical requirements of the project,in order to achieve the ideal blasting effect,the pier columns of the bridge are carefully worked out by drawing up the blasting construction scheme.The blasting parameters of box girder web and bridge platform are designed,the safe blasting initiation network is selected,and the protective measures are taken against the harmful effects caused by blasting.To prevent damage to the 500KV high voltage line over the bridge and the self-built material yard of the surrounding mixing station caused by blasting,and to ensure that the people around them are concerned.The person's personal safety.before the blasting is carried out,the main wire bridge is pre-treated,on the one hand,the abutment support at two ends of the box beam is damaged by a crushing hammer so that the two ends are suspended,the pier column is completely collapsed after the pier column is burst,and on the other hand,the crushing hammer is used for pretreatment on the box girder 1 and the No.2 blasting area,and the breaking length is not less than 1.5m;The concrete shall be stripped to expose the steel and steel strands.The demolition of the bridge not only places the focus of the work on the programming and parameter design,but also requires careful construction and scientific management.The workload of this blasting works is relatively large,the operation environment is complicated and the construction period is tight,and the orderly construction organization management is necessary,only Only through careful preparation can the ideal blasting effect be achieved.Through the practical application of the project,the blasting demolition of highway bridge in complex environment is carefully designed and managed,and the ideal blasting effect is achieved,which will be used as a reference for the blasting demolition of highway bridge in complex environment to a certain extent.Figure:[23]Table:[6]Reference:[47]...