Precautions for top installation of steel structure plant

1. In the top installation of steel structure plant, the gutter (color steel or stainless steel) is usually placed on the eaves to form an outer gutter. The distance between the overhanging members of the eaves is the column distance, that is, the overhanging members are part of the main rigid frame, and the overhanging members are connected by C-shaped steel purlins, which is a typical eaves structure. The prepared coating shall not be stored for too long. The coating shall be prepared on the day of application. The use of concentrated agent shall be carried out according to the rules of the manual and shall not be added casually.

2. The environmental measurement and absolute humidity during coating on the top of the steel structure plant shall meet the requirements of the coating product manual. When there is no requirement in the product manual, the environmental measurement shall be between 5-38 ℃ and the absolute humidity shall not be greater than 85%. There shall be no condensation on the components during coating; Protect from rain within 4 hours after coating. The parts that are not painted as specified in the steel structure installation drawing shall not be painted. The welds and high-strength bolt conflict surfaces shall not be painted temporarily. After the on-site construction, the welds and high-strength bolt joints shall be painted with anti-corrosion paint.

3. The eaves column installed on the top of the steel structure plant bears the vertical load and wind load of the light wall transmitted by the C-shaped steel wall beam, and the eaves beam mainly bears the load of ponding in the gutter or snow load. The section of each eaves member (eaves column and eaves beam) usually adopts rolled I-beam or high-frequency H-beam, and the section size is determined by bearing capacity calculation. The eaves column and eaves beam are shown as a whole, and the end is fixedly connected with the rigid frame column, that is, it is calculated as a cantilever member. In general, the load borne by the cornice of light steel plant structure is small, and the section is mostly 200 high-frequency welded H-section steel.