Study On CWR Ballasted Track Automatic Checking System

Compared with non-ballasted track, The traditional ballasted track has characteristics of reducing noise generated when the train is moving, heat-trapping, the ballasted track also has shock absorption, permeability increasing and other advantages, the laying of CWR can make passengers feel comfort and reduce the interaction between wheel and rail, improve operating conditions, the workload of track maintenance has been significantly reduced and as far as possible to increase the service life of bridges and lines, although CWR has some obvious advantages, when the track temperature is raise or low, temperature force will be generated, there will has additional stress in special lots, and it will effect stability, for example, the bridge. Ballasted track still holds a lot of proportion in my country, summarized above, laying ballasted jointless track is still a subject worthy of study. Researching on simply supported beam bridge is mature in our country, but the CWR on a Continuous Beam Bridge remains to be done, and the calculation method is complicated, the most calculation method is designed for specific form of the bridge, the calculation method and automated inspection system can not be considered common with each other. The study of CWR bridge technology has brought challenges of the future because of the special nature of CWR bridge, it is necessary to study more seamless line as long-term direction.In this paper, combined with software design basis in domestic and foreign, drawing outstanding experience in software design, the longitudinal resistance according to the new 2012 specification the values, CWR on ballasted track is studied again. It discusses the track strength check calculation, calculation and check the stability of CWR on Bridge additional force. In addition, the Visual Basic language as the framework writes parameter interface with it, and also writes the calculation software ballasted track and bridge inspection calculated the additional force calculation software in Fortran, which by Visual Basic calling Fortran open, it is a frequently method on generally programmed. Calculated by different stretching force of bridge structure and allows the rail temperature amplitude and by way of example based, the track Structure Calculation and calculation of the additional force is done, and by analyzing the calculatioted results check, Design program is put forward. Summarized, for engineering applications reference. The main research contents include:(1) Reference about design specifications and CWR theory, theory with practice, according to the basic principles of additional longitudinal force, to beam rail interaction based on the principle focuses on the basic differential equations solved simply supported beam and continuous beam flange displacement calculation. Additional longitudinal forces and calculation methods to solve different calculation.(2) According to the basic differential equations and beam rail Interation principle, program is written in Fortran, combined with Visual Basic language interface framework prepared by calling longitudinal additional force in CWR on bridge Fortran computer program prepared. CWR structure inspected by operator. It summarizes the common form of the bridge rail temperature variation amplitude ratio, and through additional computing power and continuous simply supported beam bridge girder bridge, summed force and displacement distribution, to find distribution.(3) Based on common bridge types and structures, as CWR on bridge study, the results were analyzed and compared to solve different angles.(4) Increasing the number of cross-bridges, change train entering the bridge in different directions, location, analyze what kind of bridge additional force variation summarize the distribution, to discuss practical problems arise example calculation.(5) Check calculation program, the longitudinal resistance values, and solving method are 2012 promulgated the "railway CWR design specifications" in the requirements for the preparation. Analysis of the new regulatory requirements, the CWR calculate what changes there will be additional forces.