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| Research on Measurement Methods for Track Geometry with CPIV |
| FU Heng-you1，LIU Cheng-long2 |
| 1.The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142, China；2. Southwest Jiaotong University, Chengdu, Sichuan 610031，China |
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Abstract Research purposes：The track geometry survey should be carried out before the fine adjustment of high — speed railway tracks. The current method is to use the CPIII resection at freely - occupied station for the track geometry measurement and compare the measured data with the designed parameters, and then the fine adjustment is made to make the various parameters of track regularity meeting the design requirements. Based on the features of track reference network ( CPIV) that its adjacent points have higher relative accuracy and its control points can be reserved forever for the operation maintenance, this paper presents a new method for the track geometry static inspection by using track gauge along with the force - centering device used for the occupied station and backsight on CPIV points. The trials on site with this method have been carried out in the practices.
Research conclusions：(1) The method of force - centering occupied station on CPIV for the static inspection of track geometry of ballastless slab has the merits of the short setting time and high efficiency. (2) By using the high precision between adjacent points, this method can ensure the high regularity of the track，and the experiments on site prove the measured results are correct and reliable, satisfying the code requirement. (3) The application of the CPIV network for track geometry can unify the control references for the track slab and track fine adjustment, getting better regularity indexes and being worthy of wide application. (4) The research achievement can be applied in the static inspection of track geometry on the stages of construction and operation maintenance，and has the reference value for the code compilation and improvement．
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Received: 01 March 2013
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2013, Vol. 30 
