桥梁下挂长距离大口径钢管施工难点及解决  

Construction Difficulties and Solutions of Long-distance Large Diameter Steel Pipe under Bridge

作　　者：郑全兴 ZHENG Quan-xing(Jiangsu Yangtze River Water Co.Ltd.,Yangzhou 225009,China)

机构地区：[1]江苏长江水务股份有限公司,江苏扬州225009

出　　处：《中国给水排水》2022年第6期123-126,共4页China Water & Wastewater

摘　　要：DN800钢管挂在广陵大桥下方,桥身平整光滑,无理想的支撑点,施工人员不借助外部条件无法进入桥下作业。采用悬臂工作平台+配重推车的辅助施工方法解决了支架安装、管道吊装就位、管道对口焊接等问题。采用单面焊接双面成型焊接方法前,进行了焊接试验,并编制了焊接工艺指导书;根据焊接工艺指导书施焊,克服了单面焊接双面成型焊接出现的缺陷,保证了焊缝的质量。合理设置伸缩节成功解决了管道伸缩变形的问题,经历了两次严寒极端天气的考验,管道运行平稳,保证了正常供水。A DN800 steel pipe is hung under Guangling Bridge. The bridge body is flat and smooth, with no ideal support point. The construction staff cannot enter the bridge to work without the help of external conditions. The auxiliary construction method of cantilever working platform and counterweight trolley was adopted to solve the problems of bracket installation, pipe hoisting in place, pipe butt welding and so on. Before adopting the single-sided welding and double-sided forming welding method, the welding test was carried out, and the welding instruction was compiled. According to the welding instruction, the defects of single-sided welding and double-sided forming were overcome, and the quality of the weld was ensured. The reasonable setting of the expansion joint successfully solved the problem of pipeline expansion and deformation. After two tests in extremely cold weather, the pipeline ran smoothly,ensuring the normal supply of water.

关 键 词：桥梁 悬臂工作平台 大口径钢管 支架 焊接 吊装 

分 类 号：TU991[建筑科学—市政工程]