Research on Linear Control Technology of Steel Box Beam Bridges with Small Curve radii on Shangheng Expressway
With the rapid development of highway construction in China,the application of small curve radius bridge steel box girders has become increasingly widespread,but their linear accuracy is more difficult to control.This article takes the Shangheng Expressway project in Guangxi as the engineering background.Firstly,the key factors affecting the linear control of small curve radius steel box girders are studied,and cor-responding improvement measures are proposed.The research results indicate that the key factors for linear control are the deviation between installation position and elevation,the influence of welding action,and the influence of temperature changes.When the temperature difference increases by 10℃,the maximum linear er-ror of the steel box girder increases by nearly 20.8mm.When the assembly sequence is optimal,the maximum linear error can be reduced by 14.1%.The optimal assembly sequence was determined through pre-construc-tion numerical simulation to improve the accuracy of linear control.The application of improvement measures such as welding control of horizontal and vertical deformation at the center of the docking position during the welding of steel box girders significantly improved the qualification rate of linear smoothness and achieved good economic benefits.
small radius curved bridgesteel box girderlinear controltemperature effectwelding
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