Feasibility analysis of semi-welded seamless turnout in Yuqomolangma Station of Qinghai-Tibet Railway

It is difficult to lay seamless turnouts on the Qinghai-Tibet Railway, and the large temperature difference between day and night on the plateau railway leads to large changes in the temperature of the turnouts. Aiming at the equipment status of No.1 turnout in the Yuzhufeng station of the Qinghai-Tibet railway, a non-linear finite element calculation model of P60-12 single-open turnout was established. The long rail was calculated and analyzed based on the construction lock rail temperature and the local maximum and minimum rail temperature. The development law of displacement under temperature changes, after comparing the field measured displacement observation data, the model calculation result is correct, and the lateral displacement meets the requirements. Comparing and analyzing on-site rail displacement observation data, the model calculation results meet the engineering accuracy requirements. In the season of the highest rail temperature in the year, strain sensors are installed at the rail waist at different parts of the semi-welded seamless turnout to collect the rail strain increment under the cyclic change of rail temperature. According to the strain increment change rule, displacement observation data and model calculation results, it is concluded that the scheme of laying a semi-welded seamless turnout in Yuqomangma station is feasible, and the rail in the bifurcation area is stable under the action of temperature stress.