Metal roofing design 2010-09-29 10:06:31 | Category: Professional Forum | Tags: | font size medium and small subscription.
Now both the swimming pool or gym, in most cases, steel and stone coated metal roofing, we know, the opening ceremony of the Olympic Games in 2008 the construction of the Bird's Nest is a typical steel building.
Steel construction with energy saving, environmental protection and recycling, the construction cycle is short, uniquely shaped, etc., is the future construction trends. Metal roofing as a key part of steel, its choice is also very important.
The swimming pool of the metal roofing system is no stranger to us, but how it is being installed up, and what installation steps, each step of what role, what should pay attention to what the installation process? I believe very few people can live to see. This video is one hundred security forces in metal roofing installation Heilongjiang Shengzhaoshengban swimming pool the whole process of systems engineering, ground to know that we can install the metal roof of the whole process.
Metal roofing design factors to be considered
Bearing
Withstand construction loads, rain, dust, snow pressure, maintenance load. The load-bearing properties of the metal roof and board-type cross-section characteristics, the strength of the material thickness, the force transmission means, purlins (Vice purlin) spacing on.
Wind pressure
Local maximum wind pressure resistance, the metal roof will not be pulled off the negative air pressure. Wind resistance and the stone coated steel roof and the bezel, buckle together, the density of the bracket.
Noise
Reached from the outside to prevent the sound from the indoor or outdoor indoor spread. Fill in the metal roofing insulation layer material (usually cotton as insulation), the effect of stone coated metal roofing insulation layer on both sides of the sound intensity difference in decibels. Sound effects and sound insulation material density, thickness. It should be noted: insulation material for different frequencies of sound barrier effect is not the same.
Seepage
To prevent rainwater infiltration from the outside to inside the metal roof. Rain water mainly through the gap or overlap the node into the metal roof. Impervious to achieve the function, need to screw the mouth after using the gasket fixed with hidden, in the board's lap sealant or welding process, it is best to use a long-pass plate to eliminate overlap, in a variety of node parts of the abdominal distension tight waterproofing treatment.
Lightning
To lead to ground lightning, thunder and lightning to prevent the breakdown of stone coated metal roof into the interior.
Lighting
Improve indoor lighting through skylights during the day, to save energy. A specific location in the arrangement of metal roofing panels or lighting glass lighting, skylights should be considered the life of coordination with the metal roof, skylights and metal roof in connection waterproofing treatment.
Safety devices
Set on a metal roof fixed facilities to protect construction workers and maintenance personnel.
Anti-icicle
Prevent the formation of icicles rain and snow at the eaves.
Beautiful
Metal roof looks good texture, pleasing color.
Control thermal expansion and contraction
Control the contraction of the metal roof displacement and direction. Ensure that the temperature difference between the metal roof in the area will not produce thermal expansion and contraction of stress and damage.
Insulation
Prevent heat transfer on both sides of the metal roof, indoor temperatures stable. Function through the roof insulation under the metal fill insulation materials (commonly used with glass wool, rock wool) to achieve the insulation effect to the U-value, the unit is W/M2K. Insulation is determined by the following: cotton insulation materials, density, thickness; insulation cotton humidity, and lower metal roof structure connection (to prevent "cold bridge" phenomenon); metal roofing layer capabilities of the repeated thermal radiation.
Sound-absorbing
Reduce the reflection of sound and reduce echo chamber. Sound-absorbing function by the underlying metal roof were laid in the sound-absorbing cotton, and punching on the floor to achieve. The acoustic properties of the metal roof to a sound absorption coefficient, said.
Moistureproof
To prevent the bottom of the stone coated metal roofing and stone coated steel roofing layer water vapor condensation to drain away the water vapor layer of metal roofing. The solution is filled in the metal roofing insulation layer of cotton, capped with metal roof home floor waterproof membrane, metal roof can be ventilated on the node.
Fireproof
Metal roofing materials when the fire is not burning, the flames will not penetrate the metal roof.
Ventilation
For indoor and outdoor air exchange. Set on the stone coated steel roof vents.
Anti-avalanche
In the snow on the roof area of the metal railings set to block the snow to prevent a sudden fall of snow.
Pollution
Metal roofing material will not cause environmental pollution, light pollution is not the surface of the metal roof.
Normal life
Metal roofing the main building life should be the same as 25 years, 50 years, 100 years.
Maintain
Facilitate the use of stone coated steel roofing in the maintenance period, reducing maintenance costs.
Cost
Control of the metal roof construction costs.
Al-Mg-Mn alloy steel roof and the color comparison
Metal plate used as a roofing material for several hundred years of history, and extensive use of metal materials as roofing materials, mainly because the world since the 1960s the rapid development of metallurgical industry, to produce a variety of specifications and meet the quality requirements of the metal plate and reduced costs. Metal roofing materials are galvanized steel, stainless steel, aluminum alloy plate, copper, zinc, copper and titanium plate titanium plate and so on. Sheet metal roof has the advantage of simple construction, fast, waterproof, and can be reused. In addition to resistance to the Earth's climate can be derived from outside the minimum and maximum temperatures, when used as a roofing material and roof deformation less affected by climate generated by stress, it can be painted various colors depending on the circumstances of paint.
Characteristics of magnesium manganese
Color characteristics of steel
Durability
And the atmosphere to form aluminum oxide film, and prevent further corrosion.
In moist air and rain, snow erosion corrosion under rust easily, especially the joints of the site.
Weight
Light weight (density 2700kg/m3)
Relatively heavy weight (density 7850kg/m3)
Strength and stiffness
Aluminum in magnesium, manganese content, it has some strength and stiffness
Better strength and stiffness
Appearance of
Divided into non-paint (hammer, embossing, pre-passivated aluminum surface treatment, etc.) and painting class (PVDF, SMP, PE, PVC film, etc.)
Painting class (PVDF, SMP, PE, PVC film, etc.)
Lightning Performance
Thickness of 0.7mm and 0.9mm, can be directly as a lightning air terminals (national norms <<building lightning protection design specification>> GB50057), to avoid piercing the roof.
Generally use 0.5mm thick galvanized and galvanized steel, not directly as a lightning air terminals, set up an additional lightning protection air terminals (such as lightning)
Fire Safety
Low melting point (660 degrees Celsius), the occurrence of fire, the roof susceptible to burn, so that the outward spread of fire rather than inward lateral spread, stretching from the top to help firefighters fighting fire hose.
High melting point of steel (1515 degrees Celsius),
Cost
Higher
Lower
Introduction of Al-Mg-Mn alloy:
Aluminum is now the production of human life in the application of the amount of metal in ranking the second place, only after the iron and steel; in aluminum smelting, when adding other metals such as: manganese, magnesium, copper, zinc, iron, tin, etc. to form a variety of series aluminum alloy, by adding a variety of metal alloy can greatly improve the mechanical, physical and chemical properties,
Aluminum roofing material used in this century began on the construction, aluminum roofing material has excellent durability with this, because the aluminum and the atmosphere in contact with the surface layer of aluminum oxide film, this layer of oxide film on protect the inner aluminum to prevent further corrosion. This layer of oxide film with good chemical resistance, it applies to industrial construction, air pollution is serious, or areas with a maritime climate. Authorities have done testing, annual losses due to corrosion of aluminum thickness of 0.5 microns. In this case, 0.7mm thick aluminum plate after 100 years of atmospheric corrosion have to have 0.65mm thick. So, that aluminum is the most durable roofing materials metal roofing materials, one for the United States each year there are 35 million tons of aluminum roofing.
Aluminum alloy used in the construction industry mainly extrusion and sheet rolling. Curtain walls, roofing systems primarily use 3004 series aluminum manganese (Al-Mn-Mg) alloy. 3004 series aluminum manganese alloy elongation, hardness, tensile strength, yield strength and other indicators are very suitable for roof curling, rolling pressure processing equipment, it is widely used in roofing, wall systems, building exterior maintenance projects, and with a variety of paint systems and coating process, thus making the appearance of the more colorful, but also increase the corrosion resistance of aluminum alloy itself.
Aluminum roofing material of choice minimum thickness of 0.7mm. When the aluminum thickness of 1mm, the weight of 2.7kg/m2, thickness of 0.7mm, the aluminum quality 1.89kg/m2. Membrane length. Its main features are: a density of 2.7, the melting point of 658, the temperature is 20 to 100 degrees when the linear expansion coefficient of 0.0000023, breaking load factor of 8 ~ 12kg/mm2 (varies according to the material hardness), elongation 10 40%, thickness 0.7 ~ 1.2mm, when the thickness of the aluminum corrugated board can be reduced to 0.6mm. In addition to the fixed way curling bite, rivets, but also can be used in the form of welding.
edited by stone coated steel roof
