The Study Of Railway Across The Highway Overpass Bridges Closed The Maximum Length Of Seamless Approach Road

In recent years, with the growth of social economy, our country further increases in traffic, in order to ensure the safety of railway transportation speed, crossing intersection has become mostly interchange mode.In addition to a few free drainage, across the line of railway and highway overpass Bridges water under the bridge problems basically, the effects on the vehicle and pedestrian traffic.At present, for solve the problem of "iron across the male" interchange bridge water general lack of the management of the corresponding technical standards, quality acceptance requirements, etc.Interchange bridge water governance problem belongs to the interdisciplinary subject, you need to bridge engineering, water supply and drainage engineering, material engineering disciplines such as comprehensive use, and the new material, new technology, new equipment, the integrated use of addressed.This article through inspects governance at home and abroad and the prevention of bridge culvert water successful experiences and failure lessons; Systemic proposed bridge water treatment and prevention methods and relevant countermeasures; Used to guide the overpass bridge water treatment engineering practice.This thesis mainly is divided into five parts to iron across the public pay the biggest seamless bridge closed channels length were studied.First of all, the iron cross public pay biggest seamless bridge closed channels length introduces the research background and significance, illustrate the importance of this system, and the research status at home and abroad are briefly, put forward this thesis to solve the main problems and the corresponding to complete related work. Next first of all, based on previous engineering experience and closed approach road characteristics and performance requirements, design a kind of high performance concrete. Then the stress calculation software-ANSYS in this project are introduced, finally established the mechanics analysis of closed channels geometric model. The third part software uneven settlement of the foundation are calculated respectively by calculation, vehicle load and temperature load caused by the wall deformation and stress. Adopt the following methods:first, calculating the foundation under the action of gravity stress of initial stress field, and then read the initial stress of the file as a load in the subsequent structural analysis. The fourth part is the temperature stress calculation and analysis. In this paper, thermal analysis element with 8 nodes solid70, structure of heat-indirect coupling analysis and structure of the steady state heat transfer analysis first, as the boundary of the structure analysis of the results of thermal analysis applying, structural stress analysis. Determine the maximum length of the fifth part is channels, this is the work of this study. Through the analysis in this part, it is concluded that the foundation uneven settlement, vehicle load and temperature load, the maximum length of the wall body, the shortest its value of 40.6 m.