中低速磁浮轨道伸缩接头的布置及结构设计

Arrangement and Design of Expansion Rail Joints in Medium-low-speed Maglev Transit

研究目的:中低速磁浮轨道伸缩接头是设置在相邻轨排间伸缩缝位置的连接装置,根据其适应轨缝伸缩量大小的不同,可分为Ⅰ型、Ⅱ型和Ⅲ型伸缩接头。为满足中低速磁浮运营线建设的需要,需对轨排与下部基础相互作用规律进行研究,提出伸缩接头的布置原则,并对其结构进行优化。研究结论:(1)桥梁中部轨排间伸缩位移的量值较小,采用Ⅰ型伸缩接头即可满足轨排间伸缩变形的要求;(2)桥梁端部轨排间伸缩位移主要受桥梁温度跨度的影响,伸缩接头的选用应根据桥梁的温度跨度,并结合所处气温条件和桥梁伸缩徐变具体计算确定;(3)提出了新型伸缩接头,包括Ⅰ型、Ⅱ型和Ⅲ型伸缩接头,满足了磁浮车辆对伸缩接头提出的要求,并在长沙磁浮工程中得到了应用;(4)本文研究对中低速磁浮伸缩接头的选用和结构设计具有一定的参考意义。

Research purposes： Expansion rail joints of medium - low - speed maglev are used as connecting devices which are installed at the location of expansion joints between two track panels. According to the ability of fitting the rail gap, this kind of devices are classified as model Ⅰ , model Ⅱ and model m. For the construction of medium - low - speed maglev operation line, a research on regulation of interaction between the track panel and the base is needed to be done, then the law of arranging expansion rail joints can be proposed and the structure can be optimized. Research conclusions：（ 1 ）The expansion displacement between track panels in the middle of the beam is relatively small, so model I can be adopted to meet the displacement. （2）The expansion displacement between track panels in the end of the beam is mainly affected by the temperature span of the bridge. When choosing the expansion rail joint, the temperature span of the bridge, the temperature condition around and the creeping of the concrete should be taken into consideration. （3） New kinds of expansion rail joints are proposed, including model Ⅰ , model Ⅱand model Ⅲ, which have already been used in Changsha maglev railway project. （4） The research of this paper is of great significance for picking and designing rail joints of maglev track.