What are the specific methods for strengthening the steel structure of outdoor advertising signs? Please tell me.

1. Enlarge the stressed section: This method is widely used to reinforce the supporting and connecting steel plates of advertising signs, which can improve the bearing capacity of the components, but it will also increase the weight and cost of advertising signs, which has limitations in use.

2. Externally prestressed tie rods or struts: This method can improve the bearing capacity of members and increase their crack resistance. Because this method changes the stress distribution of the original whole structure, detailed mechanical calculation should be carried out when it is implemented.

3. Adding fulcrum or bracket: This method can reduce the bearing span of members, reduce the internal stress load of rigid structures, and slow down the aging and deformation of materials; More suitable for the expansion of advertising signs.

4. Supplementary fulcrum: The stability and safety factor of the overall structure of the advertising signboard can be enhanced by increasing the base plate of the support, increasing the number of chemical expansion bolts or planting steel bars.

5. Grouting method is used to repair cracks: chemical slurry is poured into structural cracks through pressure conveying equipment to repair them. The injected chemical slurry can repair concrete cracks, prevent rust and reinforcement, and improve the overall durability of components. It is usually used to reinforce the foundation of advertising signboard and connecting steel plate.

6. Steel-bonded reinforcement method: this is a reinforcement method of sticking steel plates outside the members. It has the advantages of simple operation, short construction period, small occupied space and almost unchanged component shape. It is usually used to bear and strengthen the support of building advertising signs.