Installation method of steel structure outrigger truss

The invention discloses a mounting method of a steel structure outrigger truss. The mounting method comprises the following specific steps: S1, setting segmentation positions of an upper chord and a diagonal web member; s2, a first lifting lug and a second lifting lug are arranged; s3, diagonal web members are hoisted, and chain blocks are installed; s4, the upper chord member is hoisted, welded and fixed; and S5, the chain block is dismantled. According to the method, the number of butt welding seams is reduced by optimizing the segmentation positions, inclined pulling supporting and position adjusting are conducted on the inclined web members through the chain blocks, a supporting jig frame in a traditional installation method is omitted, the high-altitude operation amount and the high-altitude welding amount are reduced, the safety risk is reduced, and meanwhile the construction period and auxiliary materials are saved. 本发明公开了一种钢结构伸臂桁架的安装方法，具体步骤包括：S1、设置上弦杆和斜腹杆的分段位置；S2、设置第一吊耳和第二吊耳；S3、吊装斜腹杆并安装倒链；S4、吊装上弦杆并焊接固