轨道电路在无砟轨道条件下传输特性的研究

无砟轨道内部钢筋网与钢轨电流之间的互感作用,改变了轨道电路一次参数,影响了谐振式轨道电路传输性能,实际使用长度明显缩短。改进无砟轨道电气参数是提高谐振式轨道电路传输性能的有效途径。试验表明,对各种类型的无砟轨道单元进行绝缘化处理,尽量减少或消除轨道板内部钢筋所形成的闭合回路,以及距轨底320mm以内可能存在的钢筋网闭合回路,可有效地改善无砟轨道的钢轨阻抗参数;改进无砟轨道扣件系统结构,降低水膜电阻对道床漏泄的影响,有效地改善无砟轨道的道床电阻参数,从而改善谐振式轨道电路的传输性能。

Study on Transmission Performance of Ballastless Track Circuits

The mutual induction between the rail current and the internal reinforcing bar net in the ballastless track changes the electric parameters of the track circuit,which affects the transmission performance of the syntony track circuit and shortens its actual length of usage.To better the electric parameters of the ballastless track is an effective way to improve the transmission performance of the syntony track circuit.Tests indicate that the steel rail impedance parameters of all types of ballastless tracks can be improved effectively though insulation measures to reduce or eliminate the closed circuits of the reinforcing bar nets inside the ballastless track slabs and the possibly existing closed circuits of the reinforcing bar nets within a 320 millimeter distance from the steel rail bottom.To mend the fastening system structures and reduce the effect of the leakage of rain water resistances can improve the resistance parameters of the ballastless track bed effectively and so to the transmission performance of the syntony track circuit.