提高整体道床普通短轨枕螺栓扭矩合格率的途径及效果分析
2017-04-18刘耀强
刘耀强
摘要:长沙轨道交通2号线一期工程轨道工程2标,普通短轨枕数量为45478个,对应螺栓数量为90956个。螺栓的作用是连接扣件与轨枕。扭矩过大,会造成铁垫板下高弹垫板变形量过大、丧失弹性,降低减振功能,严重时可能会超过预埋尼龙套管的抗拔力造成轨枕的损坏;扭矩过小,则螺栓不能起到应有的固定作用。总之,过大过小的螺栓扭矩都会对列车的运行会产生一定影响。本文依据施工过程,结合设计文件,针对怎样提高普通短轨枕螺栓扭矩合格率就行研究,得到了切实可行的提高整体道床普通短轨枕螺栓扭矩合格率的方法。
Abstract: In the 2# of the first phase of Changsha Metro Line 2, the number of ordinary short sleepers is 45478, the number of corresponding bolts is 90956. The role of bolt is connecting fasteners and sleepers. If the torque is too large, the elastic plate deformation under the iron plate will also too large and reduce the elasticity and the damping function. In severe cases, it may exceed the pullout resistance of the embedded nylon sleeve and damage the sleepers. If the torque is too small, the bolt can not play its due role. In short, both the small and large bolt torque will affect the operation of the train. Based on the construction process, according to the design documents, this paper studies how to improve the qualified rate of bolt torque of the ordinary short sleepers. The method of improving the qualified rate of bolt torque of the ordinary short sleepers is obtained.
關键词:普通短轨枕;扣件螺栓;扭矩;合格率
Key words: ordinary short sleeper;fastening bolt;torsion;percent of pass
中图分类号:U213.3 文献标识码:A 文章编号:1006-4311(2017)09-0182-03
0 引言
目前城市轨道交通有地铁、轻轨、市郊铁路、有轨电车以及悬浮列车等多种类型,号称“城市交通的主动脉”。城市轨道交通已经成为占用土地和空间最少、运输能量最大、运行速度最快、环境污染最小、乘客最安全舒适的理想交通方式。随着城市化建设步伐的加快,中心城市不断在向周边辐射,轨道交通建设的紧迫性也在增加,各地建设城市轨道交通的热情日渐高涨。随着生产的发展和技术的进步,城市轨道交通道床主要采用整体道床,可以提高承载能力,使道床的下沉量比普通道床减小约90%,而且可使线路的纵向、横向阻力增加约0.7~4倍,排水性能也大大得到改善,具有防脏、防冻、不长草的特点。普通短轨枕为整体道床经常采用的一种轨枕形式。……
