Main points of the metal portal frame color steel factory roofing design
Anti-seepage
Prevent rainwater from seeping into the metal portal frame color steel factory house panel from the outside. Rainwater mainly enters the metal roof through overlapping gaps or nodes. In order to achieve the function of impermeability, it is necessary to use a concealed fixation after using a sealing washer at the screw port, and use a sealant or welding treatment at the lap joint of the board. Use full-length boards to eliminate lap joints, and perform tight waterproofing on various joints.
Fireproof
When a fire occurs, the roofing material of the steel frame factory will not burn, and the flame will not penetrate the metal roofing.
Wind pressure
Resisting the local high wind pressure, the metal roof panel of the steel structure factory building will not be pulled off by the negative wind pressure. The wind resistance is related to the fastening force between the metal roof panel and the fixing seat, and the density of the fixing seat.
Soundproofing
Blocks the transmission of sound from outside to inside or from inside to outside. The metal roof layer of the color steel factory is filled with sound insulation materials (usually used as thermal insulation cotton), and the sound insulation effect is expressed by the sound intensity difference between the two sides of the metal roof panel. The sound insulation effect is related to the density and thickness of the sound insulation material. It should be noted that sound insulation materials have different blocking effects on sounds of different frequencies.
Ventilation
Air exchange is carried out indoors and outdoors, and ventilation openings are set on the metal roof panel of the metal portal frame factory building.
Moisture proof
Prevent water vapor from condensing in the metal roof bottom layer and metal roof layer of the steel frame factory building, and drain the water vapor in the metal roof layer. The solution is to fill the metal roof panel of the door frame structure color steel workshop with thermal insulation cotton, lay a waterproof membrane on the metal roof bottom plate, and have ventilation nodes on the metal roof plate.
Load bearing
Withstand construction load, rainwater, dust, snow pressure, maintenance load. The load-bearing performance of the metal roof panel of the metal portal frame factory building is related to the section characteristics of the plate type, the strength and thickness of the material, the force transmission method, and the spacing of the purlins (sub-purlins).
Lightning protection
Lead the lightning to the ground to prevent the lightning from penetrating the metal roof panel and entering the metal portal steel frame factory building.
Keep warm
Prevent the heat transfer on both sides of the metal roof panel, so that the indoor air temperature is stable. The thermal insulation function is realized by filling thermal insulation materials (usually glass wool and rock wool) under the metal roof panel. The thermal insulation effect is expressed by U value, and the unit is W/M2K. The thermal insulation performance is determined by the following factors: the raw material, density and thickness of the thermal insulation cotton. The humidity of the insulation cotton, the connection method of the metal roof panel and the substructure (to prevent the phenomenon of “cold bridge”). Repeatability of metal roof layers to thermal radiation.
Lighting
Improve interior lighting through skylights during the day, saving energy. When arranging lighting panels or lighting glass at specific positions on the metal roof of the steel frame factory building, the service life of the skylight should be considered in coordination with the metal roof panel, and waterproof treatment should be done at the connection between the skylight and the metal roof panel.
Beautiful
The metal roof of the color steel workshop has a good texture and pleasing color.
Control thermal expansion and contraction
Control the shrinkage displacement and direction of the metal roof panel of the steel structure workshop. Ensure that the metal roof panel will not be damaged by the stress caused by thermal expansion and contraction in areas with large temperature differences.
Avalanche
Set up snow-blocking railings on the metal roof of the metal portal frame color steel factory in the snowfall area to prevent the snow from falling suddenly.
Anti-icicle
Prevent rain and snow from forming icicles at the cornice of the metal frame structure color steel workshop.
