Study On Construction Safety Control Demolition Of Hyperbolic Arch Bridge

Bridge demolition construction is a very complex project, has the feature of high risk, hightechnology, high difficulty. In general, only the bridge structure itself the problem and the use of functionscan not meet the requirements when considering the implementation of the demolition work, in this case,the bridge of the force and the potential safety hazard is difficult to grasp clearly. The old bridge afteroperation and repair years of reinforcement, the strength, stiffness, stability have varying degrees of decline,and the demolition process of bridge structure system changes, the structure stress is very complex, and noconstruction experience, the dismantling of the construction can not be on the bridge analysis can controlcalculation, especially the demolition project design is not mature, removal of the difficulty and risk will bevery large. Once the dismantling of the construction organization and management and technical level tograsp the careless, would lead to casualties painful.The double-curved arch bridge in China originated in the nineteen seventies, the design concept forthe main arch ": to break up the whole into parts" were prefabricated,"set to zero to form the scenecombination and the whole", so as to reduce the lifting weight, reduce mechanical requirements, suitablefor China at that time limited construction conditions. Because this kind of bridge joint, resulting in theoverall performance is poor, easy to crack, and the bridge capacity surplus amount. Therefore, thedouble-curved arch bridge has been eliminated by the code for design of the current bridge, the bridge to allor part of this kind of bridge demolition, quantity, complex structure stress, boundary conditions anddiverse, removal difficult, high technical risk. This kind of bridge has a growth trend, the task is veryformidable. Therefore, how to safely remove hyperbolic arch bridge becomes more and more important, isof great practical significance to dismantle construction safety control.In this paper, the construction of Wuan bridge demolition mines in Hebei Province as the researchobject, formulate the demolition reasonable construction plan, adopted a strict monitoring measures, theconstruction process of the indicators are strictly controlled within the preset range, to ensure the smoothand safe of the whole construction process, has successfully realized the removal and control of double archbridge. Based on theoretical analysis and experience summary of bridges, this paper mainly studies thedouble-curved arch bridge demolition construction plan and optimization, safety control system isestablished, the dismantling of the construction control simulation and stability analysis, will providereference for the same type of structure of the demolition, and for the corresponding standard reference.