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| Research and Application of Method for Retesting CPⅢ Control Network During Operation and Maintenance Stages of High-speed Railway |
| REN Xiao-chun, ZHOU Dong-wei |
| China Railway First Survey and Design Institute Group Ltd, Xi'an, Shanxi 710043, China |
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Abstract Research purposes: As the control datum for checking and adjusting the railway track of high-speed railway during the operation and maintenance stages, the CPⅢ track control network needs to be retested regularly within four hours of maintenance window time at night. With the retesting method stipulated in the current code for the CPⅢ , it has to be co-tested with the control points of the higher rank section by section. In this way, there are lots of retesting works to be done and the retesting efficiency is low. So it is very important to develop a retesting method and work out a kind of standard for judging the stability of the control point for retesting the CPⅢ during the operation and maintenance stages of high-speed railway.
Research conclusions: (1) By simulation calculation, the recommended values of the limit error of lateral and longitudinal chord lengths were determined and they were separately 1 mm and 2 mm. With these data, the verified tests were done for judging the stability of the retesting control points. The judging method was as follows: When the limit error of the lateral chord length between the adjacent control points of CPⅢ did not exceed the limit of 1 mm, it showed that at least the stability of one control points was poor. For further confirming the stability, it needed to see whether the limit error between the longitudinal chords lengths of these two control points and their adjacent CPⅢ points exceed the limit of 2 mm or not. (2) The testing results showed that the conclusions obtained by using the method presented in this paper were consistent with that obtained by using the methods stipulated in the current codes, so this method was feasible and the research result could provide the reference to working out and improving the specifications for retesting CPⅢ.
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Received: 06 October 2012
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2013, Vol. 30 
