近年来大跨度网架结构日益增多,而这些网架的拼装、焊接工作在我国采用如下两种施工方法,一是在地面施工墩上进行焊接,然后整体提升就位,二是在高平台上直接进行拼装、焊接。这二种方法都要求精确测定施工墩的高程,如采用一般路线水准测量方法,工作量大,而且往往由于前后尺距 In recent years, the structure of large-span network racks has been increasing. The following two construction methods are adopted for the assembly and welding of these network racks. First, welding is performed on the ground construction piers, and then the entire site is lifted in place. The second is on the high platform. Direct assembly and welding. Both of these methods require the accurate determination of the height of the construction pier, such as the use of general route leveling methods, the workload is large, and often due to the ruler distance before and after