The Jacking Speed Limit 60km/h Line Reinforcement System Research Into Heavy Haul Railway Frame Bridge Under Highway

Daqin overloaded railway has created a miracle in the world’s heavy railway transportation field, it is the largest railway traffic in the world, its annual volume of traffic is expected to achieve 460 million tons in 2014 and the transport situation will be very nervous. The Mizhuo highway is the important part of Beijing large outer ring, it needs the frame bridge jacking construction in the junction with the Daqin overloaded railway, Until now, the research on the overloaded railway frame bridge jacking construction line reinforcing system is very few, generally the jacking construction’s slow speed limit is 45km/h, the research literature of loaded railway frame bridge jacking construction slow speed limit be up to 60km/h has never been found. The main content is :(1)Summarizing the research status of the reinforce system of domestic routes, the engineering cases of the Daqin railway frame bridge jacking construction which the Mizhuo railway runs up from.(2)In combination with jacking frame bridge engineering design and construction experience, I set the different parameters of multiple conditions change, the changing parameters include the models of reinforcing system of i-steel beams、the span of reinforcing system dangling par、the train speed,for each working condition based on the principle of the finite element static analysis and based on the theory of the car line(bridge) dynamic analysis of dynamic analysis.(3)In the process of static analysis,for load conversion coefficient and train operation safety assessment index, I introduced the railway track and railway bridges, building structure and other related specification to compare, and taking the heavy train and the factors of improving the speed limit into consideration, so as to determine the values; dynamic analysis based on car line(bridge) dynamic analysis theory, as well as the safety index are discussed.Through comparison and analysis of the static simulation and dynamic simulation results, it is concluded that influence on the reinforce system that results from the change of specific parameter, and then I point out the reinforce system proposal when the overloaded railway frame bridge jacking construction slow speed is to be 60km/h.