The surface of steel structure will be corroded when exposed to the atmosphere directly.When there is corrosive medium in the air of steel structure workshop or steel structure is in humid environment, the corrosion of steel structure workshop will be more obvious and serious.The corrosion of steel structure not only reduces the cross-section of the component, but also produces local corrosion pits on the surface of the component.When the members are stressed, stress concentration will occur, leading to premature failure of the structure.Therefore, enough attention should be paid to the anti-corrosion of steel structure workshop components, and corresponding countermeasures and measures should be taken in general layout, process layout and material selection according to the corrosive medium and environmental conditions.Ensure the safety of the plant building structure.Ant-irust primer and finish are usually used for corrosion protection of steel structures.The number and thickness of the coating is usually determined by the environment and performance of the coating.Generally, under the action of natural atmospheric medium, the indoor steel structure needs a coating thickness of 100 microns, namely two coats of primer and two coats of finish.Under the action of industrial atmosphere, the total thickness of paint film of open steel structure or steel structure is required to be 150-200 μ M.Chlorosulfonated acid resistant coating is needed for steel structure in acid environment.The steel column base shall be wrapped with concrete of not less than C20 underground, and the thickness of its protective layer shall not be less than 50mm.

The construction of light steel structure mainly grasps the following four characteristics: scale, line, color and change.

The facade of the steel structure workshop is mainly determined by the process layout.In order to meet the process requirements, the facade is simple and gorgeous, and the connection is as simple and unified as possible.The color steel plate makes the light steel workshop building light and colorful, which is obviously superior to the traditional reinforced concrete structure.In the design of light steel plant, skip flower and cold tone are often used.It highlights the main water inlet and outlet, outer groove and side water blocking, which not only reflects the grand momentum of modern factory, but also enriches the facade effect.

Steel has high thermal conductivity, and its thermal conductivity is 50W (M.C).When the temperature is above 100 ℃, the tensile strength decreases and the plasticity increases.When the temperature reaches 250 ℃, the tensile strength of the steel increases slightly, but the plasticity decreases, resulting in blue brittleness.When the temperature reaches 500 ℃, the strength of steel decreases to a very low level.Causing the collapse of the steel structure.Therefore, when the ambient temperature of steel structure exceeds 150 ℃, it is necessary to carry out heat insulation and fire protection design.

The layout of roof support system shall be determined according to its span, height, column network layout, roof structure, crane tonnage and seismic fortification intensity.Generally speaking, no matter purlin or purlin system, roof structure shall be supported vertically.In the system without purlin, the large roof slab can play the role of chord support by adopting three-point welding and roof truss welding, but the constraints of construction conditions and installation needs should be considered.Whether or not purlin system roof is adopted, the top chord lateral support shall be set on the top chord of roof truss and skylight truss.For workshops with roof truss spacing of not less than 12 meters or workshops with super heavy bridge crane or workshops with large vibration equipment, longitudinal horizontal support shall be provided.Share Building.At present, there are two commonly used methods of steel structure roof on the market: rigid roof: double-layer color special-shaped steel plate plus heat preservation cotton; composite flexible roof: roof color steel plate inner plate, air heat preservation layer, heat preservation layer and coiled material waterproof layer.

The temperature change will cause the deformation of the steel structure workshop and the temperature stress of the structure.When the plane size of the plant is large, in order to avoid large temperature stress, temperature expansion joints should be set in the vertical and horizontal directions of the plant.The section length can be carried out according to the steel structure specification.Temperature expansion joints are usually treated by setting two columns.Rolling bearing can be set on roof bracket for longitudinal temperature expansion joint.