Key Technology and Application of Steel Truss Girder Bridge Jacking Construction
Steel truss bridge has the advantages of long span and high strength.As a steel structural compo-nent,it is widely used in highway and railway bridge structure.Due to the large span and high bridge position,there will be high risk in the construction process.The key technology and application effect of steel truss girder bridge jacking construction are studied.Taking the single-span double-span high-speed railway steel truss bridge in a province as the construction object,the precamper of steel truss beams was set according to the site construc-tion conditions,and the components were designed according to the"Code for Design of Steel Structure of Rail-way Bridge Beams".In the jacking construction process design,concrete simply supported beams are selected to build the installation platform,guide beams and slideway are integrated into one body to calculate load,stress values are obtained through analysis different parameter conditions,and guide beams and slideway are erected.The steel girder is pushed up in the way of successive joint installation to realize the construction of the bridge across the existing cable.In the experiment,the construction phase is divided into three parts,and the joint dis-placements of the main beam and guide beam are monitored respectively.Under the application of the method in this paper,the displacement can be guaranteed within 30 mm,which has application value.
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