公铁两用钢桁梁铁路桥伸缩纵梁节点板更换施工

发布时间：2019-06-15 00:54

【摘要】：枝城长江大桥主桥为(4×160+5×128)m公铁两用连续钢桁梁桥,主桥钢桁梁为"米"字桁。运营40余年后检查发现主桥铁路桥伸缩纵梁处连接竖向拉板的节点板出现裂缝(共4处)。为确保桥梁结构和列车行车安全,通过对伸缩纵梁处节点板断裂病害进行分析,在保证铁路运输交通安全的前提下,对断裂的节点板、角钢、拉板进行更换。节点板更换工艺为先将连接螺栓解除,拆除原节点板的连接杆件和连接板(先拆除次要连接杆件,后拆除主要连接杆件),然后对旧连接孔及杆件接触面进行相应处理;安装新杆件的顺序为拆除顺序的逆过程(先安装主要连接杆件和节点,再安装次要节点)。结构分析表明,更换后伸缩纵梁结构的整体受力性能加强,能够满足铁路桥梁伸缩变形的要求。该桥利用铁路维修天窗点进行杆件更换,整个施工未对营业线的安全造成影响。
[Abstract]:The main bridge of Zhicheng Yangtze River Bridge is (4 脳 1605 脳 128) m continuous steel truss bridge, and the steel truss of the main bridge is "meter" truss. After more than 40 years of operation, it was found that there were cracks in the joint of the vertical pull plate at the telescopic longitudinal beam of the main bridge railway bridge (a total of 4 places). In order to ensure the safety of bridge structure and train running, the fracture disease of joint plate at telescopic longitudinal beam is analyzed, and the broken joint plate, angle steel and drawing plate are replaced on the premise of ensuring the safety of railway transportation traffic. The replacement process of the joint plate is to remove the connecting bolt, remove the connecting member and the connecting plate of the original joint plate (first remove the secondary connecting member, then remove the main connecting member), and then deal with the old connecting hole and the contact surface of the member accordingly; the order of installing the new member is the inverse process of the demolition sequence (first installing the main connecting member and joint, and then installing the secondary joint). The structural analysis shows that the overall mechanical performance of the telescopic longitudinal beam structure is strengthened after replacement, which can meet the requirements of telescopic deformation of railway bridges. The bridge uses railway maintenance skylight to replace the members, and the whole construction does not affect the safety of the business line.
【作者单位】：中铁大桥局武汉桥梁特种技术有限公司;
【分类号】：U448.121;U445.6

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