钢结构吊装至屋顶后，焊接在结构上。
The steel structure, after being lifted to the roof shall be welded on the structure.
为了保证钢结构安装精度，在吊装过程中，对桁架的整体变形进行了计算和监测。
In order to ensure the installation precision of steel structure, the overall transformation of the truss is calculated and monitored during the hoisting.
为了保证钢结构安装精度，在吊装过程中，对桁架的整体变形进行了计算和监测。
In order to ensure accuracy, and Assembly of steel structure in the installation process, the overall on the truss computed deformation and surveillance.
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