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研究目的:对高速铁路咽喉区由正线2股道变为站内6股道形成的多股道变化的道岔群进行研究,选择合理的桥梁结构以满足无缝道岔的布置要求。研究结论:通过对无砟轨道无缝线路车站咽喉区道岔连续梁结构形式研究,总结出道岔区桥梁结构形式选择的控制因素;为设计出能满足无砟轨道无缝道岔受力及变形要求的结构需重点解决如下问题:(1)确定无砟轨道无缝道岔对桥梁结构变形及梁缝位置的要求。(2)根据无砟轨道无缝道岔对桥梁结构梁缝处钢轨横向相对位移限值的要求,确定合理的梁跨横向布置。(3)根据确定的梁跨结构形式,建立无缝道岔-桥梁-墩台一体化力学模型,计算岔区轨道、梁体和下部结构的工作状态。(4)做梁部结构整体及局部分析。
Research purposes: To study the turnout group of multi-track roadway formed by 2 lines from the main line to 6 lines in the throat area of the high-speed railway, and to select the reasonable bridge structure to meet the layout requirements of the seamless turnout. Research conclusions: Based on the research on the structure of turnout continuous beam in the throat area of ballastless track railway station, the control factors of the choice of bridge structure in turnout area are summarized. In order to design the structure that can meet the stress and deformation requirements of the seamless turnout of ballastless track, The structure should focus on solving the following problems: (1) Determine the requirements of the bridge structure deformation and beam gap position of the ballastless track turnout. (2) According to the requirement of the rail lateral relative displacement limit of the seamless joint of ballastless track on the beam joint, determine the reasonable transverse arrangement of the beam. (3) According to the determined beam-span structure form, the integrated mechanics model of seamless turnout-bridge-pier-abutment is established, and the working state of the track, beam body and substructure in the turnout area is calculated. (4) to do the overall beam structure and local analysis.