Advantages: 1, natural material, bright and crystal clear, hard and permanent, noble and elegant. 2. Frost resistance: stone can resist freezing and thawing in wet state without obvious damage, which is called frost resistance. When the temperature is as low as -20℃, the water in the rock pores freezes, and the water in the pores expands110. If the rock can't resist the force generated by this expansion, it will be destroyed. Generally, if the water absorption rate is less than 0. 5%, regardless of its frost resistance.
Advantages and disadvantages of stone curtain wall Advantages: 1, natural material, bright and crystal clear, hard and permanent, noble and elegant.
2. Frost resistance: stone can resist freezing and thawing in wet state without obvious damage, which is called frost resistance. When the temperature is as low as -20℃, the water in the rock pores freezes, and the water in the pores expands110. If the rock can't resist the force generated by this expansion, it will be destroyed. Generally, if the water absorption rate is less than 0. 5%, regardless of its frost resistance.
3. Compressive strength: The compressive strength of stone will be different due to mineral composition, crystal thickness, uniformity of cementing material, load area, load and cleavage angle and other factors. Other things being equal, dense materials with fine grains are usually bonded to each other and have higher strength. After drying and saturation, there is no difference in compressive strength of dense volcanic rocks (water absorption rate is extremely low). If it is porous and water-afraid cemented rock, its wet and dry strength is obviously different.
3. In all construction projects, the state requires the supervision company to be responsible for the quality, which is completely correct and necessary, and is the key to ensure the quality of the project. Unfortunately, many supervision engineers are civil engineers, who don't understand curtain walls, let alone stone curtain walls. This is because there is a lack of curtain wall teaching materials in supervision training materials, and many supervisors are retired technicians. How to ensure the final quality without training and understanding of curtain wall supervision? Due to the lack of learning new technology, construction quality inspection stations all over the country often encounter various difficulties in quality acceptance.
4. The fireproof performance of stone curtain wall is very poor, especially in high-rise buildings. Fires are usually lit indoors. The fire in the building will increase the temperature of the stainless steel plate and metal structure that hangs the slate, so that the steel will soften and lose its strength. Slates will fall from tall buildings, which will not only cause danger to pedestrians, but also make it difficult to put out the fire. This is like the World Trade Center in the United States, because the World Trade Center is all steel structures, steel loses its strength when it softens at high temperature, and the World Trade Center collapses from top to bottom.
Advantages and disadvantages of glass curtain wall: Glass curtain wall is a new contemporary wall. The biggest feature it gives to architecture is the organic unity of architectural aesthetics, architectural function, architectural energy saving and architectural structure. Buildings present different colors from different angles, and with the changes of sunlight, moonlight and lighting, they give people a dynamic aesthetic feeling. Magnificent glass curtain wall buildings have been built in major cities on all continents, such as New York World Trade Center, Chicago Petroleum Building and Sears Building. The Bank of China Building in Hong Kong, Beijing Great Wall Hotel and Shanghai Lianyi Building have also been adopted.
Disadvantages: Glass curtain wall also has some limitations, such as light pollution and high energy consumption. In addition, the natural beauty of glass curtain wall is not resistant to pollution, especially in the northern region where there is much dust in the atmosphere, serious air pollution and little rain, glass curtain wall is very easy to get dirty, which will not only add luster to the urban landscape, but also lose face. Poor materials, low construction quality, uneven colors and different ripples. Because the light reflection is uncontrollable, the light environment is chaotic. However, with the emergence of new materials and new technologies, these problems are gradually brought into the comprehensive research system of architectural modeling, building materials and building energy efficiency, and discussed as a whole design problem.
Advantages and disadvantages of metal curtain wall Advantages: Up to now, aluminum curtain wall in metal curtain wall has been dominant. Lightweight materials reduce the load of buildings and provide good selection conditions for high-rise buildings; Excellent waterproof, antifouling and anticorrosion performance, ensuring the long-term growth of the external surface of the building; Processing, transportation, installation and construction are relatively easy to implement, which provides strong support for its wide use; The diversity of colors can be combined and processed into different appearance shapes, which expands the design space of architects; High cost performance, convenient maintenance and long service life, meeting the requirements of the owner. Therefore, aluminum curtain wall, as a kind of architectural form with great impact, is favored.
Disadvantages: 1 Anti-deformation ability of curtain wall system: scientific mechanical calculation should be carried out for every important part of curtain wall system, and the influence of wind pressure, dead weight, earthquake and temperature on curtain wall system should be considered, and the embedded parts, connection system, keel system, panel and fasteners should be carefully checked to ensure the safety of curtain wall.
2. Whether the plates adopt floating connection; The floating connection ensures the resilience of the curtain wall after deformation, ensures the integrity of the curtain wall, prevents the curtain wall from being deformed due to the acting force, and avoids bulging or depression on the surface of the curtain wall.
3. Fixing method of plate: The fixing method of plate plays a decisive role in the flatness of plate installation. Inconsistency in the stress of each fixed point of the plate will cause the deformation of the surface material and affect the decorative effect of the external wall. Therefore, the plate fixing method must adopt the fixed distance compaction method to ensure the smoothness of the curtain wall surface.
4. Are there any reinforcement measures at the edge removal of composite plate material? Because the edge of composite plate material only keeps the thickness of the front plate, the thickness becomes thinner and the strength decreases, so there must be reliable reinforcement measures for edge removal.
5. Whether the reinforcing ribs are reasonably arranged on the back of the plate to increase the strength and rigidity of the plate. The layout distance of reinforcement and the strength and rigidity of reinforcement itself must meet the requirements to ensure the use function and safety of curtain wall.
6. Whether the waterproof sealing method is reasonable: There are many waterproof sealing methods, such as structural waterproof, internal waterproof and glue sealing, and the prices of different sealing methods are not the same. Select the appropriate sealing method to be used in the project to ensure the function and external decoration effect of the curtain wall.
7. Whether the selected materials meet the specifications, standards and design requirements.