Research On New Technology Of Measurement And Data Processing For Railway Track Control Network(CPⅢ)

In recent years,the achievements of China’s high-speed railway construction are obvious to all.From the opening and operation of the Beijing-Tianjin inter-city railway to the construction and operation of the Wuhan-Guangzhou high-speed railway,Zhengzhou-Xian high-speed railway and Harbin-Dalian high-speed railway,a new chapter of China’s high-speed railway development has been set off.With the construction and operation of a large number of high-speed railways in China,and the existing railways in operation,more and more railway mileage needs to be operated and maintained.The track control network(CPⅢ)is needed as the positioning datum when the large-scale road maintenance machinery equipped with high precision and professional measuring equipment is used to maintain the line status.After investigating the measurement and application status of track control network(CPⅢ)of railway in China,the author finds that there are some unreasonable or need to be improved in the process of measurement and data processing of the current track control network(CPⅢ).In order to make the measurement technology of the track control network(CPⅢ)more scientific and reasonable,and to shorten the measurement time and improve the work efficiency,the author studies deeply the theory and method of the track control network(CPⅢ),and puts forward the following four new construction and measurement methods of the track control network(CPⅢ):(1)This paper systematically studies the construction scheme and measurement method of point-to-point distance 120 m general speed railway track control network.It introduces the network design,point-to-point layout,measurement method,field measurement technical index and data processing method,and the processing principle of CPⅢ trigonometric elevation network based on indirect elevation difference.It also compares the new network with the traditional CPⅢ traverse network.Finally,the feasibility of the new network is verified by the calculation experiment and statistical analysis of the data of CPⅢ plane network and CPⅢ trigonometric elevation network.(2)This paper systematically studies the new method of establishing the track control network(CPⅢ)in the form of single-point interleaving,and introduces the construction and measurement methods of planar network and triangular elevation network in the form of single-point interleaving.Through the calculation experiment and precision statistical analysis of single-point staggered CPⅢ plane network data and CPⅢ trigonometric elevation network data,as well as the three-dimensional free stationing measurement experiment of the total station,it is considered that the accuracy of single-point staggered track control network(CPⅢ)can meet the relevant precision requirements of high-speed railway,and can effectively improve the measurement efficiency of high-speed track control network.(3)This paper systematically studies the new method of establishing CPⅢ control network in one-sided form,calculates the measurement data of CPⅢ control network in one-sided form and makes statistical analysis of its accuracy.It is considered that the accuracy of CPⅢ plane network and CPⅢ triangular elevation network in one-sided form can meet the relevant precision requirements of high-speed railway.Finally,the feasibility of establishing CPⅢ control network with V-shaped skylight is verified by the three-dimensional free stationing measurement experiment and its accuracy statistical analysis.(4)A new method of obtaining coordinates of constrained points in CPⅢ planar network repetition measurement is proposed,and the calculation experiment of the new method is carried out.By comparing and analyzing the results of the traditional method of CPⅢ planar network repetition measurement and the new method of CPⅢ planar network repetition measurement with the original coordinates,it is concluded that the new method of obtaining the coordinates of constraint points in CPⅢ planar network repetition measurement proposed in this paper is feasible.