重载道岔轨底坡设置研究

轨底坡作为道岔的主要参数,直接影响钢轨使用寿命,结合30 t轴重重载道岔研究需要,对轨底坡进行系统研究。针对重载线路道岔鱼鳞纹、掉块、肥边等病害,运用车辆轨道耦合动力学理论,对25 t轴重货车通过不同轨底坡道岔时的动力响应进行分析。结果表明:轨底坡增加,横向轮轨力、接触应力和安全指标,导曲线上股钢轨磨耗功都有不同程度的降低,长期观测结果显示,采用1∶20轨道坡的试验道岔,导曲线钢轨光带居中,未见伤损。

Research on Rail Cant of Heavy Load Turnout

Rail cant affects rail life directly as an important design parameter of turnout and rail cant is studied systematically to meet research need of heavy turnout of 30 t axle load. Dynamic responses of 25 t axle load freight car passing turnouts with different rail cants are analyzed with vehicle-track coupling dynamics theory in perspective of fine corner crack,fall-block,fat edge and other defects. The research results show that lateral wheel-rail force,contact stress,safety indicators and wear power for outside guiding curve rail decrease with the increase of rail cant. The long-term observation indicates that the test turnout with 1∶ 20 rail cant has its light band in the middle of upper surface of the guiding curve rail without damage.