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| Research on the Trans-section CWR in the Large Daily Temperature Difference Environment of the Plateau |
| PAN Zili1, WANG Shuguo2, XIE Yi1, XU Yupo2, XU Jian3, HE Niangzhe1, HAN Yu4, WEI Zhengkong5, LIU Jianguang1, LI Baoyou1, CAO Bao1 |
1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China;
2. China Academy of Railway Sciences Corporation Limited, Beijing 100089, China;
3. Tibet Railway Construction Co. Ltd, Linzhi, Tibet 860000, China;
4. China Railway 11th Bureau Group Third Engineering Co. Ltd, Shiyan, Hubei 442012, China;
5. China Railway Qinghai-Tibet Group Co. Ltd, Xining, Qinghai 810007, China |
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Abstract Research purposes:This paper calculated the stability and mechanical properties of the seamless turnout in the large daily temperature difference environment of the plateau with stability formula and the finite element method, analyzed the possibility of the laying of trans-section CWR in the plateau environment with an annual temperature difference of about 70 ℃ and the daily temperature difference of about 40 ℃, and designed trans-section CWR of the station and the tracks at both ends. By using the glue joints to eliminate the turnout and buffer rail joints, the seamless turnout on the bridge was laid for the first time in Tibet, and trans-section CWR between one station and two sections was realized. Through online monitoring and safe operation for more than a year, a large number of reliable data and operation experience of trans-section CWR with large daily temperature difference of the plateau were accumulated.
Research conclusions:(1) It proves that it is feasible to lay trans-section CWR in a plateau environment with an annual temperature difference of about 70 ℃ and a daily temperature difference of about 40 ℃.(2)The glue freezing joint is feasible as the rail connection mode of CWR, which can provide another technical direction for the seamless non-seamless line. (3) In the plateau environment of large daily local temperature change, the key to CWR maintenance is seamless turnout.It is necessary to pay attention to the track geometric position state of the turnout and the displacement of the sharp track and the heart track, and strengthen the maintenance in time when the bad state occurs.
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Received: 26 September 2022
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2023, Vol. 40 
