青岛港一期油码头钢引桥预应力卸载技术

针对青岛港一期油码头钢引桥下弦杆等构件腐蚀严重而导致结构安全风险的问题,进行临时加固设计研究。采用下弦杆钢绞线预应力卸载加固方法,确保全面加固过程的结构安全,形成钢桁架桥卸载加固技术,包括钢绞线布置方案、端部锚固、转向块、减振措施等。结果表明,该技术是一种轻型快捷加固技术,可作为临时结构加固措施和永久受力构件的安全储备。研究成果可为类似工程提供参考。

Load shedding technology with pre-stress for steel approach bridge of Qingdao Port phase I oil-wharf

In view of the problem that the structural safety risk is caused by the serious corrosion at the lower chord of steel approach bridge of Qingdao Port phase I oil-wharf,we study the design of temporary strengthen,apply the strengthen method of load shedding with pre-stress to the steel strand of lower chord,ensure the structural safety in the process of comprehensive strengthen,and form the strengthening technology of unload steel truss bridge.The key technology includes the arrangement plan of steel strand,end anchorage,steering block and damping measure etc.The results show that the strengthen technology has the advantages of light-load and high-speed,which can be used for temporary structure and permanent stressed member.This technology can provide the references for the similar projects.