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| Study on the CP Ⅲ Vertical Control Network Establishing Method of High—speed Railway Based on Free．—station |
| FU Jian—bin1，LIU Cheng—long2，LU Jian—kang3，HE Bo2，YANG xue—feng2 |
| 1．Construction Management Department of MOR，Beijing 100844，China；2．Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3．China Railway Eryuan Engineering Group Co．Ltd，Chengdu，Sichuan 610031，China |
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Abstract Research purposes: Aiming at the measurement for establishment of high—speed railway track control network CP Ⅲ vertical control network，the paper not only analyzes the technical requirements of CP Ⅲ vertical control network but also the technical features of methods from Germany and China for establishment of vertical control network，and based on the principle of free—station in cPm plane control network，the feasibility of building CP Ⅲ trigonometric leveling net work by the observational values of free—station in CP Ⅲ plane control network is discussed．
Research conclusions:Through the introduction of the middle method of total station，CP Ⅲ trigonometric leveling network is established and compared to the prerequisite for high precision trigonometric leveling，it is considered to be feasible．At the same time，comparison and statistical analysis among actual accuracy index of large mounts of CP Ⅲ trigonometric leveling network data are done，proving that the method proposed in the paper can meet the accuracy；equirements for the second order leveling and CP Ⅲ vertical control network，SO it is a new method in establishing CP Ⅲ vertical control network．
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Received: 20 October 2010
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2010, Vol. 27 
