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《Journal of Railway Engineering Society》 2008-09
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Research on the Detection Method of CPⅢ Points Stability in Fine Adjustment of Ballastless Track

XU Xiao-zuo,LIU Cheng-long,YANG You-tao(Southwest Jiaotong University,Chengdu,Sichuan 610031,China)  
Research purposes: Fine adjustment of ballastless track has become one of the key technologies in control survey for ballastless track construction.In fine adjustment of ballastless track,the stability of CPⅢ points which are involved in resection should be detected before three-dimensional strict adjustment of the resection station,and then remove the unstable CPⅢ points.How to detect the stability of CPⅢ points and analyze the stability judgement method of CPⅢ points as well as its feasibility,and also put forward some suitable judgement standards,so as to make sure the high precision of ballastless track laying.Research conclusions:The paper proposes the method about the stability detection of Control Points Ⅲ,which uses the information provided after the early CPⅢ plane and elevation control network adjustment and the measured distance and height difference of every two CPⅢ points calculated by measured data of free station in fine adjustment of ballastless track,and then compares with known distance and height difference.Theoretical analysis and testing results both validate that the method is correct and can detect the stability of CPⅢ points in plane and elevation.So the method proposed in the paper can be widely used in the project.
【CateGory Index】: U213.244
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