The Research Of The Remediation Technology Of Da-Qin Overload Railway Bridge

The rapid development of heavy-duty rail transport improves the railway transport capacity and economic benefits, but the train axle to improve and increase the existing railway bridge group poses a serious impact. The use of existing standard design bridge structure, although largely to meet the operational requirements of the train, but also exposed the lack of lateral stiffness small span bridges, piers lateral vibration is too large, stand-threatening diseases exacerbated train safety issues and so on. In this paper, a small span concrete simply supported under heavy load transport conditions Datong-Qinhuangdao railway bridge as the research object, through the renovation of existing bridges Retrofitting, analyze results and operational status of bridge strengthening regulation after a systematic study, the main research contents are as follows:(1)Small and medium-span reinforced concrete beams juxtaposed small lateral rigidity for lateral coupling problem, a corresponding transverse reinforcement measures, and the corresponding transverse beam end limit measures; 8m to span reinforced concrete beams for the study, the real test by the bridge beams and indoor entity simulation test, proposed vertical stiffness issues such weak beam corresponding remediation measures.(2)A big problem for the lateral vibration double column piers, Da-Qin Railway existing bridge, for example, proposed a variety of design reinforcement scheme, and its comparative finite element analysis, combined with real bridge operational performance tests, analyze enhance lateral rigidity double column pier the reinforcement effect, the corresponding reinforcement program.(3)For rocking shaft bearing activities and the amount of displacement is too large dowel pins and other diseases break, stand by analyzing the causes of disease, combined with the Datong-Qinhuangdao railway bridge bearing applications both cases, the rocker shaft bearing activities proposed renovation and replacement of the disease process; against small span concrete beam flat, curved seat anchors and other diseases break through the analysis of the causes of bearing defects, appropriate remediation measures proposed.