Research On The Related Technology Of Precision Measurement For Speed-Raising Reform Of Existing Railway

With the rapid development of China’s economy,the bottleneck of railway transportation is very prominent.The rapid development of railway construction has solved the problem of the scale of railway transportation to a certain extent,but how to carry out the railway efficiently and accurately The operation and maintenance of the railway is an urgent problem to be solved at present.The traditional method of measuring the wire used in the ballast track control network can not meet the requirements of the existing railway ballasted track speed transformation measurement,taking into account the high-iron ballastless track CPIII control network construction network program The successful application of the pipeline into the existing line of ballast line control network layout,and according to the ballast control network of the relevant technical indicators and requirements,put forward an improved existing line network construction program,and for the new control network construction Network technical indicators,track precision test and line linear optimization design and other aspects of research.The main research contents include the following aspects:1.The paper studies the network construction scheme of the foundation control network of the ballast track,and studies the control network layout,the control point layout and the field observation requirements.It introduces the data preprocessing,the adjustment process and the precision assessment of the plane control network.The accuracy and the technical requirements of the transition to the control network are deduced by the wire,and the correctness and feasibility of the network construction scheme are verified by the adjustment of the existing railway survey data.2.The study of free set triangular elevation network to replace the traditional precision leveling to obtain the control point elevation,due to the construction of the plane when the network can be synchronized to obtain the triangular elevation of the observation data,so the design based on the free set of triangulation elevation orbit elevation In order to verify the correctness of the scheme,the control network will compare the results with the precision level measurement data,and its accuracy can meet the requirements of the existing line height control network.3.The measurement principle and station accuracy of the intersection of the total station overlap station are studied,and the bit error of the fixed pile control is taken into account.The stability of the control point is analyzed by using the observation data.4.The method of linear segmentation and optimization fitting of ballistic railway track is studied.In the aspect of plane linearity,the curve optimization method based on direction acceleration is studied,and the measured data of the transition curve segment and the principle of minimum amount of dialing are taken into account.The analysis shows that the method can significantly reduce the amount of adjustment before and after the curve In this paper,a circular curve fitting method with restricted condition is proposed,which solves the problem of the center deviation caused by the relatively small arc diameter by using the geometric relation between the center line and the parallel angle of the front and rear clamps.