关键词: 烟囱, 钢内筒, 整体吊装, 焊接, 设计与计算

Abstract: For increase the safety reliability of the whole hoisting installation process of steel inner cylinder of large-seize chimney, The 300t steel cylinder inside the chimney of a thermal power plant in Guangzhou is taken as an example, Design and calculation of the whole hoisting installation process of steel inner cylinder of large-seize chimney is optimized, The selection method of welding segment is explained, Various calculation methods are used to check the design of the components of the integral lifting system, At the same time, the whole welding scheme is introduced, The key points of quality and safety control in the construction process are summarized. The actual construction operation shows that: Using various finite element analysis software to calculate and check the lifting equipment, steel strand, anchorage, square frame, circular box girder and lifting lug, could optimize the design of the components of the lifting system; The safety reliability of steel inner cylinder construction process of large chimney is improved; On the premise of ensuring safety, reducing the specifications of lifting strand can effectively increase the operability of on-site construction; The output oil circuit design of lifting jack is consistent to ensure the overall lifting synchronization; Each welding segment is designed as arc plate with height less than 1.8m, which effectively solves the problem of difficult transportation of steel inner cylinder assembly welding segment. By using various calculation methods, the design of integral hoisting components of large chimney steel inner cylinder is reviewed, which greatly increases the safety and reliability of hoisting process, and provides reference for similar engineering construction.

Key words: chimney, steel cylinder, whole hoisting installation, weld, design and calculation