Non-support installation construction method for large cantilever steel structure

The invention discloses a support-free installation construction method for a large-scale cantilever steel structure, which realizes quick tower crane hook replacement of the large-scale cantilever steel structure, saves the occupied time of a tower crane, does not need temporary measures such as jig frame construction, saves materials, shortens the construction period, is simple, safe and reliable to operate, and has good popularization value. The method solves the problem that an existing traditional installation method of a large-span steel structure cantilever structure is high in cost. 本发明公开了一种大型悬挑钢结构无支撑安装施工方法，实现了大型悬挑钢结构的快速塔吊换勾，节省了塔吊的占用时间，同时无需施工胎架等临时措施，节省材料、节省工期，操作简单安全可靠，具有良好的推广价值。本发明解决了现有的大跨度钢结构悬挑结构的传统安装方法存在成本高的问题。