南仓特大桥桥上无缝线路设计

研究目的：研究刚构连续梁桥上无缝线路伸缩力的计算方法以及在曲线桥上不能设置伸缩调节器的情况下，如何加强无缝线路稳定性。 研究方法：通过对结构进行分析，建立刚构连续梁力学计算模型，利用计算机程序计算伸缩力；通过分析结构稳定性，研究桥上无缝线路线路加强设备。 研究结果：研制出在路基和桥梁地段都适用的无缝线路加强设备，即横向阻力器，通过实测阻力检算无缝线路稳定性。 研究结论：刚构连续梁可根据其结构建立计算模型计算伸缩力，计算参数宜采用实测数据，线路纵、横向阻力现场实测更重要；桥墩对梁的变形影响随墩刚度增加而增大，当采用高墩即墩顶纵向刚度较小时，影响也较小；横向阻力器制造、搬运和安装均较简单，而且对保证无缝线路稳定性有很大作用。

Design of Jointless Track on Nancang Bridge

Research purposes: The researches are done on the method for calculating the expansion force of jointless track on rigid structural continuous bridge and how to strengthen the stability of jointless track under the situation of no expansion adjustor installed on curve bridge.Research methods:Through making analyses of the structure,the mechanics calculation model is established for rigid structure continuous beam,with which to calculate the expansion force.Through making analyses of the structural stability,the research is done on the development of reinforcement device for the jointless track on bridge.Research results:The suitable reinforcement device-lateral resistant has been developed for the jointless tracks on subgrade and bridge,so the stability of jointless track can be calculated with the tested resistance.Research conclusions:For rigid structure beam,the expansion force can be calculated by establishing calculation model according the structure of it.The tested data should be used as calculation parameters,for which the more important thing is to test vertical and lateral resistances on site.The influence on the deformation of beam by the pier becomes larger with increment of rigidity of the pier and the influence becomes small when lateral rigidity on the pier top is less.Although the lateral resistant is easy to make,handle and install,but it plays great role in ensuring the stability of jointless track.