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扣件技术是无砟轨道结构关键技术,为保证行车绝对安全和旅客乘坐的舒适性,要求钢轨扣件具有足够的扣压力,文章通过试验研究蠕变对WJ-7型扣件扣压力损失的影响.分别进行保持扣件变形不变与保持初始扣压力不变的两组(各5套扣件)试验,在组装好的扣件相应位置埋设压应力传感器以测量扣件扣扣压力,在保持一定扣压力情况下,用T型螺栓螺母位移的变化表示弹条的蠕变变形量,对比分析两种情况下扣件蠕变规律及其对扣压力的影响.试验表明:在初始扣压力为10 k N,分别保持扣件弹条变形不变和保持扣件扣压力不变情况下,弹条蠕变分别为1.45 mm和2.12 mm,若都转化成扣压力的损失,则分别为1.00 k N和1.46 k N,且二者蠕变都是前期快后期慢,但后者蠕变时间更长,且蠕变量更大.理论分析还表明:应力水平对蠕变影响很大,应力水平大,蠕变发展迅速.
Fastener technology is the key technology of ballastless track structure. In order to ensure the absolute safety of driving and passenger ride comfort, rail fasteners are required to have sufficient buckling force. The article studies the creep pressure loss of WJ-7 buckle fastener Respectively, the two groups (each with five sets of fasteners) were kept in constant deformation and kept the initial buckling pressure, and a compressive stress sensor was embedded in the corresponding position of the assembled buckle to measure the fastening buckle pressure. Under the condition of certain buckling pressure, the variation of the displacement of the T-bolt nut indicates the creep deformation of the spring bar and the creep regularity and the buckling force of the buckle under the two conditions are contrastively analyzed.The results show that under the initial buckling pressure Is 10 kN, respectively, keep the deformation of the fastener strip and keep buckle buckle pressure unchanged case, the strip creep were 1.45 mm and 2.12 mm, respectively, if the buckle pressure into the loss, then 1.00 kN and 1.46 kN, respectively, and the creep of the two is slow in the early and late period, but the creep time of the latter is longer and the creep quantity is larger. The theoretical analysis also shows that the stress level greatly affects the creep, Large level, rapid development of creep.