一起高速公路桥梁伸缩装置失效事故成因分析  

Failure Accident Mechanism of a Bridge Expansion Joint on an Expressway

作　　者：杨雪峰 刘桥缘 张诗波 刘怡杉 骆勇[4] YANG Xuefeng;LIU Qiaoyuan;ZHANG Shibo;LIU Yishan;LUO Yong(School of Automobile and Transportation,Xihua University,Chengdu 610039,China;Traffic Police Headquarters of Sichuan Public Security Department,Chengdu 610037,China;Sichuan Xihua Jiaotong Forensic Center,Chengdu 610039,China;Sichuan Vocational and Technical College of Communications,Chengdu 611130,China)

机构地区：[1]西华大学汽车与交通学院,四川成都610039 [2]四川省公安厅交通警察总队,四川成都610037 [3]四川西华交通司法鉴定中心,四川成都610039 [4]四川交通职业技术学院交通运输与经济管理系,四川成都611130

出　　处：《综合运输》2024年第1期179-186,共8页China Transportation Review

基　　金：四川省科技厅重点研发项目(2022YFG0132);西华大学校重点项目(Z211005);四川省现代道路行车安全保障工程技术研究中心科研项目(2021-ZD-03)资助。

摘　　要：为对涉及桥梁伸缩装置失效的交通事故的成因鉴定提供借鉴作用,以一起发生在京昆高速四川段某桥梁上的DX-160型模数式伸缩装置失效事故为例,对失效伸缩装置的构造、损坏状况、材料性能、焊接质量、安装质量等方面进行实地检验、金相分析和拉伸试验,并利用物理学原理对中梁与横梁焊接的失效、位移箱支座的失效以及中梁型钢的断裂失效进行了分析,最终锁定该伸缩装置失效的成因。结果表明:桥梁伸缩装置部分位移箱预留槽的混凝土在浇筑施工时未完全填充捣实,以致在频繁的交变载荷下,部分位移箱底板开裂,造成部分位移箱内的支座脱落以及部分横梁和中梁的焊缝断裂,从而改变了中梁型钢承受车辆行驶载荷的传递方式,最终导致中梁型钢在该处发生疲劳断裂失效。To provide reference for the cause identification of traffic accidents involving bridge expansion device failure,a DX-160 modular expansion device failure accident on a bridge in Sichuan section of Beijing-Kunming highway was used as an example.Field inspection,metallographic analysis and tensile test were carried out on the structure,damage condition,material properties,welding quality,installation quality and other aspects of the failure expansion device.And the failure of the welding between the middle beam and the cross beam,the failure of the displacement box support and the fracture failure of the middle beam steel were analyzed by using the physics principle,and the causes of the failure of the expansion device were finally locked.The results show that the concrete of the reserved slot in some displacement boxes of the bridge expansion device was not fully filled and tampered during the previous construction,so that the bottom plate of some displacement boxes cracked under frequent alternating loads.The bearing in part of the displacement box fell off and the weld fracture of part of the beam and the middle beam broke,which changed the transmission mode of the middle beam steel bearing the driving load of the vehicle,and finally led to the fatigue fracture failure of the middle beam steel at this place.

关 键 词：道路工程 桥梁伸缩装置 成因鉴定 伸缩缝病害 

分 类 号：U491.3[交通运输工程—交通运输规划与管理]