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公路下穿铁路线路时,通常采用顶进施工法保证既有铁路线路的运营,由于受到线路交角、施工及使用等诸多因素的制约,采用横抬梁法可以保证施工的进度及安全性,确保行车作用下,临时框架结构的安全性;沿铁路行驶方向组拼的纵梁承受横梁传递的线路荷载。结合工程实例,介绍了横抬梁法加固线路方式的结构构造特点和评估计算方法,对通常按刚度控制结构的挠跨比进行详细的说明,验证此加固方法的合理性。
Road under the railway line, usually by jacking construction method to ensure the operation of existing railway lines, due to line crossing, construction and use of many other factors, the use of cross-beam method can guarantee the progress and safety of construction to ensure that Under the action of the vehicle, the safety of the temporary frame structure; the longitudinal beams assembled along the direction of the railway bear the load of the lines transmitted by the beams. Combined with the engineering examples, the structural features and evaluation methods of the cross-beam method to reinforce the line are introduced. The flexural-span ratio, which is usually controlled by the stiffness, is described in detail to verify the rationality of the reinforcement method.