1, steel structure plant roof support system and roof design
The layout of roof support system should be determined according to the span, height, column network layout, roof structure form, crane tonnage and seismic fortification intensity of the area. In general, the roof structure with or without purlin system should be provided with vertical support; In the purlin free system, the large roof slab has three points and roof truss welding, which can play the role of upper string support, but considering the restrictions of construction conditions and installation needs. No matter the roof with purlin or without purlin system, the upper chord of the roof frame and the upper chord of the skylight frame shall be provided with upper chord transverse support. For the workshop with roof truss spacing of not less than 12m or the workshop with extra-heavy bridge crane or the workshop with large vibration equipment, the longitudinal horizontal support should be set up.
2, steel insulation and fire protection
Steel has a high thermal conductivity, its thermal conductivity is 50w(m. C), when heated to more than 100 C, its tensile strength will be reduced, plasticity increases; When the temperature reaches 250℃, the tensile strength of the steel will be slightly increased, but the plasticity will be reduced, and the blue brittleness phenomenon will appear. When the temperature reaches 500℃, the strength of the steel drops to a very low level, which will cause the steel structure to collapse. Therefore, when the ambient temperature of the steel structure reaches more than 150 ° C, it is necessary to do heat insulation and fire protection design.
3, temperature expansion joint setting
The temperature change will cause the deformation of the steel structure plant, so that the structure produces temperature stress, when the plant plane scale is large, in order to avoid large temperature stress, the temperature expansion joint should be set in the vertical and horizontal directions of the plant, the length of the section can be executed according to the steel structure specifications. Temperature expansion joint generally adopts the method of setting double columns to deal with, and the longitudinal temperature expansion joint can be set at the roof truss support.
4. Anti-rust treatment
Enough attention should be paid to the corrosion prevention of steel structure plant members, and corresponding countermeasures and measures should be taken according to the erosion medium and environmental conditions of the plant in the general layout, process layout, material selection, etc., to ensure the safety of the plant structure.
5. Facade design
The facade of the steel structure plant is mainly determined by the process layout, and strives to make the facade simple and magnificent while meeting the requirements of the process. The color molded steel plate makes the building of the light steel plant show a light shape and rich color, which is obviously better than the heavy single of the traditional reinforced concrete structure. In the design of the light steel plant, jumping colors and cool colors are often used, focusing on the main entrance, outer gutter, edge flooding and other places, which not only reflects the magnificent momentum of the modern plant, but also enriches the facade effect.
