论文部分内容阅读
合福铁路铜陵长江大桥主桥为双塔多跨连续钢桁梁三索面斜拉桥,钢桁梁的桁片采用国内首次应用的大型整体焊接式的结构设计,长30m、高15.5m,单重约360t。通过对整体桁片拼装的工艺要点和施工难点研究分析;设计专门的组装定位胎架,合理确定上、下弦杆与竖、斜杆接口组装、定位、测量、焊接的顺序,控制焊接收缩和变形;采取控制环境温度、锤击法、减少扩散氢含量等工艺措施,提高焊缝质量;利用平面试拼装确保桁片间纵向连接精度。实践证明:大型整片桁片的关键拼装技术提高了工厂化的桥梁制造精度,缩短了桥梁的安装架设周期。
The main bridge of the Hefei-Fuzhou-Tongling Yangtze River Bridge is a three-girder cable-stayed bridge with double-tower and multi-span continuous steel trusses. The steel truss girder adopts the large integral welded structural design for the first time in China, with a length of 30m and a height of 15.5m. Single weight of about 360t. Through the research and analysis of the technical points and the construction difficulties of the whole truss assembly, a special assembly of the tire rack is designed, the order of assembly, positioning, measurement and welding of the upper and lower chords and the vertical and inclined rods interfaces is reasonably determined, and the welding shrinkage and deformation are controlled ; To take control of the ambient temperature, hammering method, to reduce the diffusion of hydrogen content and other technical measures to improve the quality of the weld; the use of flat test assembly to ensure the longitudinal connection between the accuracy of the web. Practice proves that the key assembling technology of large-scale whole-chip truss improves the manufacturing precision of factory-made bridge and shortens the period of installation and erection of the bridge.