1.Heat insulation and fire protection of steel

        The steel has high thermal conductivity, the thermal conductivity is 50W (MC), when heated to more than 100 degrees, the tensile strength will decrease, and the plasticity will increase; when the temperature reaches 250 degrees, the tensile strength of the steel will slightly increase, but the plasticity will decrease, and there will be blue brittleness; when the temperature reaches 500 degrees, the strength of the steel will decrease very low, which will cause the steel structure.Therefore, when the temperature of steel structure is above 150 ℃, the fire protection design must be carried out.

2.Roof support system and roof design

        The roof support system should be determined according to the height, span, column arrangement, roof structure, crane tonnage and fortification intensity.Under normal conditions, whether the roof purlin system should be set in the vertical support; purlin system, large roof panel three welding and roof, can play a supporting role, but considering the construction conditions and installation needs.Regardless of roof purlin, purlin system should be set in the upper transverse support truss and roof truss winding.No less than 12m bridge crane or serious level plants or plants with larger truss spacing shall be provided with longitudinal horizontal support.Share  architecture.At present, there are two types of steel structure roofing Market: rigid roof: double color steel plate with cotton insulation; composite flexible roof: color steel roof panel, insulation layer, insulation layer, waterproof layer.

3.Setting of temperature expansion joint

        The change of temperature will cause the deformation of the steel structure workshop and cause the structure to produce temperature stress. When the aircraft construction scale is large, in order to avoid excessive temperature stress, temperature expansion joint should be set in two directions of the workshop, and the length of the section can be carried out according to the steel structure specification.The temperature expansion joint usually adopts double column setting method, and the rolling bearing can be set at the roof support for the longitudinal temperature expansion joint.

Steel structures in  will be corroded directly when exposed to the atmosphere.When the air or corrosive medium of steel structure is in humid environment, the corrosion of steel structure workshop will be more obvious and serious.Corrosion of steel structure will not only reduce the cross-section of members, but also cause local rust pits on the surface of steel members.When the member is loaded, the stress concentration will be caused and the structure will fail prematurely.Therefore, it is necessary to pay attention to the rust prevention of steel structure workshop components, and put forward the corresponding countermeasures and measures. The overall layout should be adopted, according to the corrosion medium and environmental conditions of the workshop, the process layout and material selection, so as to ensure the structural safety of the workshop.Corrosion protection of steel structure is commonly used as anti-rust primer and topcoat. The quantity and thickness of coating are usually determined by the application environment and coating performance.Under the action of natural atmospheric medium, the thickness of general indoor steel structure needs 100 meters, that is, two primers and two surface primers.Under the action of open-air steel structure of steel structure or industrial atmospheric medium, chlorosulfonic acid coating should be used for the film thickness of 150 μ m, 200 μ m ~ and the acid environment of steel structure.The part of steel column base below the ground shall be wrapped with concrete not less than C20 and the thickness of protective layer shall not be less than 50mm.