高速铁路桥梁病害整治顶梁工作对轨道结构的影响分析

Analysis on the Impact of Girder Jacking for High-speed Railway Bridge Defects on Track Structure

针对某高速铁路地震后桥梁受损情况及修复方案,研究了修复桥梁工程的顶梁工作对轨道结构稳定性及强度的影响,从减少轨道结构受扰动和缩短修复工作时间的角度,提出了不同顶梁方案在不同轨温下顶梁高度的理论建议值,结果表明:(1)从减少有砟轨道结构扰动的角度考虑,控制顶梁允许高度的主要影响因素为轨道的稳定性;(2)某高速铁路按照建议顶梁高度实施顶梁操作,并在顶梁过程中对桥梁和轨道几何状态进行监测。监测结果表明,钢轨应力及位移均在允许范围内,这验证了轨道适应性理论计算结果的正确性。研究成果可为桥梁病害整治顶梁修复提供参考和借鉴。

In response to the damage and restoration plan of bridges after earthquake on a high-speed railway,this study investigated the impact of bridge girder jacking on the stability and strength of track structure.From the perspective of reducing disturbance to the track structure and shortening the restoration time,theoretical recommended values for the height of girder jacking under different rail temperatures were proposed for different girder jacking schemes.The results showed that:(1)Considering the reduction of disturbance to the ballast track structure,the main impact factor for controlling the allowable height of girder jacking is the stability of the track.(2)Girder jacking was carried out on a highspeed railway to the recommended height,and the geometric state of the bridge and track was monitored during jacking.The monitoring results showed that the rail stress and displacement were within the allowable range,which verifies the correctness of the theoretical calculations of track adaptability.The findings can provide reference and guidance for girder jacking and repair of bridge defects.