When steel structure is strengthened by additional fulcrum, the following points should be paid attention to:

(1) Although this reinforcement method can improve the bearing capacity by reducing the span or displacement of the reinforced structure, it can be divided into rigid support method and elastic support method according to the different mechanical and deformation characteristics of the support structure and components.The former usually transfers the load to the foundation directly through the supporting roof, but there are also cable-stayed bridges as the supporting points, which transfer the load directly to the beam column joints of other structures with larger rigidity or can be regarded as “fixed points”.In this case, due to the small axial compression deformation of the transmission member, it can be ignored in the calculation.Therefore, the stress of the structure is relatively clear and the calculation is greatly simplified.For the latter, the load is transferred indirectly to other structures which can be used as fulcrum through the bending or frame failure of the load transmitting members.In this case, the deformation of the reinforced structure and the transmission member can not be ignored, so the compatibility of deformation between them must be considered in the calculation of internal force.

(2) In the design of supporting structure or components, prestressed scheme shall be adopted.The prestressing force shall be based on the fact that there is no crack on the surface of the supporting member at the fulcrum and no additional reinforcement.

(3) The materials of supporting structure and components shall be determined according to the environment and use requirements of the reinforced structure.When steel members and their connections are used in high temperature and humidity environment, effective anti rust and heat preservation measures shall be taken.

How to ensure the successful completion of steel structure engineering tasks?

1.Select excellent management personnel to form a project management team to perform the planning, organization, coordination, control, supervision and command functions of project construction.At the same time, select a professional team that is not afraid of difficulties and can work continuously to ensure the smooth progress of the project with high standards.

2.Take the total construction period as the goal, take the stage control plan as the effective condition, ensure the use of internal and external enterprises, implement dynamic management, make the construction organization scientific and reasonable, and ensure that the plan is completed on time or in advance.

3。Implement comprehensive plan management, carefully prepare feasible project schedule network plan and corresponding operation plan, coordinate construction and production, link long and short plans, adhere to daily balance and weekly plan of network end plan, ensure the implementation of monthly plan and the realization of plan.Determination of the total construction period of the project.

4。In order to speed up the construction and take measures to reasonably arrange the interpolation construction, Guiyang steel structure processing, capping construction, steel structure installation, roof enclosure installation, door and window processing and installation cross construction, the operation must obey the unified arrangement.The general contractor shall arrange the specific schedule according to the general construction schedule, and formulate feasible guarantee measures to ensure the scientific and orderly construction.Ensure that the time frame of the project is guaranteed.