Large Span Steel Truss Bridge Jacking Force Analysis Of Construction Process And Control Technology Research

The construction method of large-span steel structure of bridge has a variety of forms, should be based on the method of comprehensive selection of structure form,the span of bridge size, construction of environmental factors in order to achieve theappropriate, convenient construction, reduce cost, reduce the period ofcomprehensive economic benefit, safe and reliable and good purpose, includingpushing construction has not affected the bridge traffic condition, less construction equipment, is conducive to the production organization, safety and reliability andshorten the construction period, become one of the common construction methods of large span steel bridge. The large steel truss bridge structure with its good stress,light weight, high strength and stiffness requirements etc., become the ideal bridgeacross the river, deep canyon.But the main beam in the jacking construction processby far than the other conventional construction methods are complex, it is necessaryfor accurate simulation of the construction process.Based on the background of Huang Hanhou156m railway steel truss bridge, studystress on the bridge jacking construction process and deformation monitoring.Establish the solid model of the whole bridge finite element software MIDAS, analysis of the whole process of pushing construction steel truss bridge, the steel truss bridgein jacking construction process stress simulation calculation and analysis of deformation, so as to provide reference for similar engineering construction. In order to ensure the safety of bridge construction and ensure the large span steel truss girder bridge alignment and stress can satisfy the design requirements, according to the construction control and the needs of actual construction of steel truss bridgeconstruction control of push technology research.This paper introduces the development situation and push construction, construction monitoring method on the steel truss bridge and the purposes and principles are briefly described. Then by using MIDAS finite element analysis software for each stage of bridge jacking construction process of stress and deformation of thenumerical analysis. The main content of finite element analysis, including the girdertruss bridge stress and linear variation, semi cantilever bridge half simply supportedthe state of stress and displacement changes etc.. At the same time, the stresssensor for bridge jacking construction process of stress measurement. Through the analysis of the MIDAS results with the measured values, the two data is consistent. In the actual construction process, construction control personnel through between the calculated results and actual measurement values, to discover problems in time,provide the feasible advice for the safe construction of the next stage, theconstruction monitoring purposes.To ensure the safety of construction of the long span bridge.