Research On The Accelerated Construction Technology Of Steel Truss Girder Bridge With Medium Span

This paper aims at the typical structural form of steel truss girder bridges with medium-and-small-span,studies its standardized design,accelerated construction technology,can further accelerate and promote the application of such structures in practical projects,and can promote the “threeizations”,standardization design,factory production and accelerated construction.Relying on the construction of steel truss girder bridges with medium and small span in Shandong Province,the relevant results of this paper can be promoted in large scale in the region and provide technical reference for the construction of small and medium span steel bridges in other provinces and countries along the “One Belt and One Road” in China,with a broad prospect of engineering applications.The main research contents and conclusions are:1.To sort out and analyze the current research status of bridge accelerated construction technology and steel truss girders both at home and abroad,and integrate the accelerated construction technology into the design and construction of steel boring bars.According to the basic structure of steel truss girder bridges,design requirements of steel truss girder bridges and design calculation theory of steel truss girder bridges,standardized design dimensions of steel girders of 60 m,70m,80 m are given.The pitch of the joint and the truss width of 11 m are the same as the cross section of the bar.There is only a slight difference in dimensions.The numbers and dimensions of the corresponding span steel truss girders can be found based on the provided charts,and calculated by MIDAS.The overall strength and stiffness of the state meet the design requirements.2.Drawing on these years of domestic and foreign steel truss girder erection techniques,the push construction technology and integral hoisting construction technology are very consistent with the concept of rapid construction.According to the principle,characteristics,classification and pushing construction technology of push construction,using MIDAS to simulate the steel truss girder pushing construction process,the static performance of the structure of each construction stage can meet the design requirements.3.There are many domestic experts on the section lifting,but there is less research on the overall lifting of steel trusses with small and medium-span.Several schemes were proposed for the position of lifting points of steel borings as a whole,and simulations and calculations were performed for these schemes.The calculation results show that the construction scheme of “two-machine four-lift” symmetrical hanging point arrangement is feasible,and the structural strength and rigidity meet the design requirements during the construction process.4.Analysis and comparison the deformation and stress of the structure during the construction and lifting of the steel truss girders with spans of 60 m,70m and 80 m.Considering the construction period,the requirements of the equipment and the environment,and the ease of construction,it is found that the conditions permit Under the circumstances,the hoisting construction is more suitable for the accelerated construction of small and medium-span steel truss girders.However,the overall lifting requirements for lifting equipment are too high,the general project is difficult to meet,and the actual operation is difficult to ensure the synchronization of the crane.Therefore,at the current stage,the incremental launching construction has relatively great advantages due to the relatively mature technology,but in the future,it can meet with the equipment and operating accuracy,the overall lifting will have wide applicability.