Research On Construction Monitoring Technology Of Overhead Railway Steel Truss Girder Pushing Over Water Diversion Main Canal

Recently,the construction of China’s transportation infrastructure,represented by the railway,has developed rapidly.Among them,the large-scale steel truss bridge structure with good strength,light weight,high strength and rigidity has become the ideal bridge for crossing rivers and deep trenches.type.At the same time,the large-span steel truss girder also has the unfavorable characteristics of long construction period,cumbersome steps,complicated construction of the bridge body and construction facilities,etc.Bridge construction monitoring is a key step in the design and construction of the connection,so it is essential for the smooth and safe construction of the bridge.In this paper,the heavy-duty railway crosses the diversion main channel steel truss girder as the engineering background,and the construction monitoring technology in the pushing process of the steel truss girder bridge is studied.The main content is based on the structural design type and push-on construction scheme of steel truss girder.It focuses on the analysis of the mechanical calculation model construction,mechanical calculation and structural stress change in the construction process of long-span steel truss girder bridge.The abnormal condition warning and feedback analysis appeared to evaluate the safety status of the bridge and finally ensure the smooth completion of the steel truss push.The main research content of this paper:Systematic research on the technology of steel truss girder push construction and bridge construction monitoring.The basic theoretical knowledge of the development history and research status of steel truss girder,the characteristics of jacking construction and the significance of bridge construction monitoring are briefly described.Based on the engineering example,the finite element analysis software Midas/civil is used to establish a numerical analysis model for the steel truss main raft and other temporary auxiliary structures to simulate the overall pushing construction process of the steel truss beam.According to the finite element analysis model and the mechanical calculation theory,the strength and stability of the structural members are checked,the safety of the structure in the jacking construction is verified,and the stress of each structure under the most unfavorable working conditions is determined,which is the actual pushing process.The comparative analysis of the stress monitoring point layout and the measured value of the stress provides scientific theoretical calculation data.Formulate the stress monitoring plan for the key components in the project and the stress warning mechanism for the construction process,conduct real-time stress monitoring on the steel truss girder push construction,calculate and monitor the data in time,and analyze the comparison between the measured value and the warning value.Grasp the changes of each structure,and timely feedback the structural force information to ensure the smooth progress of the push construction.Considering the two construction states of steel truss girder construction and train operation,the construction and operation phases are safe and economical,and the steel girders are optimized.The material characteristics are not changed,and the section size is used as the optimization index.Optimize the current steel truss beam structure.