Research on the Fabrication Process of Integral Double-Jointed Members of Huangshali Steel Truss Bridge

Taking the upper chord of the Huangshali steel truss bridge as an example， a systematic analysis was conducted on the characteristics and difficulties in the processing and manufacturing of integral double-jointed members with an anchor box structure. Starting from part production， a detailed analysis and control of the impact of cutting， welding， assembly， and other processes on the accuracy of large-sized vertical plate units were carried out. Subsequently， precision control in the manufacturing process of partition units that affect assembly accuracy was elaborated. Measures and methods for controlling precision during part manufacturing were provided， ensuring strict control over manufacturing accuracy from the source. In terms of member assembly， precision control points for each stage were explained one by one， from the selection of the initial assembly method to the subsequent assembly of welding plate units， welding groove types， welding box sections， welding anchor boxes， crossbeam joint plates， stiffening plates， and other components. The proposed measures include strict control over the shape and dimensions of the gusset plates， maintaining perpendicularity between the straight sections of the vertical plates and the gusset plates during material connection， controlling the spacing between the two joints， reasonably reserving welding shrinkage and secondary cutting allowances， improving the accuracy of partition plate manufacturing methods， rationally selecting assembly methods， and implementing precision control measures throughout the assembly process. As a result， the manufacturing accuracy of the members of the Huangshali steel truss bridge was effectively controlled， ensuring the overall quality of the members and fully meeting the precision requirements of the bridge manufacturing specifications. Furthermore， the proposed measures can accumulate valuable experience and provide a reference for the precision control in the manufacturing of integral double-jointed members for steel truss bridges in the future.