1 Before installation, the construction unit shall check the product certificate, design documents and pre-assembly records of the components, and re-inspect the dimensions of the recorded components. When the deformation and defects of the steel structure exceed the allowable deviation, they should be treated.

Before the installation of the steel structure, a detailed measurement and correction process shall be prepared. The welding of the thick steel plate shall be carried out before the welding installation to simulate the technical process of the product structure, and the corresponding construction process shall be prepared. A certain degree of arching should be preset for the assembled roof truss.

2 After the steel structure is hoisted in position, the control points of the component positioning axis and elevation should be marked for measurement, and the quality of the hoisting butt joints should be checked before welding. Temporary support and steel waves are installed to make the steel roof trusses safe and stable during construction.

3 When the steel structure is installed, the construction unit shall submit the elevation dimensions, welding, painting, etc. after lifting each component to the supervisor for acceptance.

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