插入道岔施工对运营高速道岔锁定轨温变化影响试验OA北大核心CSTPCD

To investigate the impact of Turnout Inserting Construction (TIC) on the Stress-Free RailTemperature of Existing high-speed Turnout (SFRTET), a scheme to measure the change in SFRTET based on the bi-directional strain approach is proposed. The measurement principle of SFRTET changes caused by different factors is derived, and the data processing method for monitor-ing the change in SFRTET is determined. Field experimental research on the change of SFRTET is conducted. The results show that the difference between the rail installing-sensors temperature ob-tained from the SFRTET monitoring data and the directly measured data is only 1.4％, validating the rationality of the measuring principle and the correctness of the data processing method. The SFRTET of high-speed turnouts is influenced by each stage of TIC, exhibiting significant dynamic change characteristics during the stages of demolishing track structure, track structure construction, fine adjustment of turnout geometry, and integrated commissioning. This indicates that the SFRTET would undergo certain cyclic changes before reaching stability. The SFRTET of existing high-speed turnouts is most significantly affected by the re-welding of the branch rail, especially the branch rail near the welding position, with a temperature change of up to 12.87 °C. It is recommended that the rail welding construction should be carried out when the rail temperature is close to the original SFRTET.