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暖通空调杂志社>期刊目次>2021年>第3期

地铁车站轨行区风管吊具疲劳安全性能试验研究

Experimental study on fatigue performance of air duct hangers in underground railway stations

李晓[1] 毛军[2]
[1]北京市地铁运营有限公司[2]北京交通大学

摘要:

地铁轨行区上方的通风管路长期受到地铁列车活塞风和自身振动的动态循环冲击作用,易发生吊具松动和风管脱落事故,对列车行车安全构成严重威胁,准确掌握吊具动荷载性能和安全可靠性至关重要。设计制作了风管吊具和专用加载装置,进行了频率为5 Hz、累计200万次的循环动态加载疲劳试验和极限拉拔试验。结果表明:吊具结构形式与连接螺栓类型直接影响动荷载性能及安全可靠性;采用槽钢与围岩连接,槽钢的动态弹性变形和恢复过程比较明显;切底螺栓远比普通膨胀螺栓牢固;普通膨胀螺栓先于吊具发生失效,吊具先于切底螺栓发生失效;圆钢与角钢焊接的强度高于螺栓螺纹连接的强度;吊具的结构型式以“A型吊架+切底螺栓”为最优,安装时螺栓的预紧力控制在40~43 N·m为宜。

关键词:地铁车站,风管,吊具,螺栓,疲劳试验,安全

Abstract:

The ventilation pipeline above the underground railway travel area is affected by the dynamic cyclic impact of the piston wind and its own vibration in underground railway train for a long time, which is prone to the accidents of the hanger loosing and the wind pipe falling off, which poses a serious threat to the safety of the train. Therefore, it is very important to accurately grasp the dynamic load performance and safety reliability of the hanger. Designs and manufactures the air duct hanger and the special loading device, and carries out cyclic dynamic loading fatigue tests and limit drawing tests with a frequency of 5 Hz and a total of 2 million times. The results show that the structural form of the hanger and the type of connecting bolt directly affect the dynamic load performance and safety reliability. When channel steel is connected with surrounding rock, the dynamic elastic deformation and recovery process of channel steel are obvious. The bottom cutting bolt is far stronger than the ordinary expansion bolt. The common expansion bolt fails before the hanger, and the hanger fails before the bottom cutting bolt. The welding strength of round steel and angle steel is higher than that of bolt thread connection. The optimal structure type of the hanger is “A-type hanger plus bottom cutting bolt”, and the pre-tightening force of the bolt during installation should be controlled from 40 Nm to 43 Nm.

Keywords:undergroundrailwaystation,airduct,hanger,bolt,fatiguetest,safety

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