First, the advantages and disadvantages of stone curtain wall
advantage:
Natural materials, bright crystal, hard permanent, noble and elegant.
Freeze-resistance: In the wet state, stone can resist freeze-thaw without significant damage. This property is called freeze-resistance. The water in the rock pores freezes when the temperature is as low as minus 20 Celsius, and the expansion of water in the pores is 1/10 larger than the original volume. If the rock can't resist the force of this expansion, it will be destroyed. In general, if the water absorption is less than 0.5%, its frost resistance is not considered.
Compressive strength: The compressive strength of stone varies depending on factors such as mineral composition, crystal thickness, the uniformity of the cemented material, the load area, the loading effect, and the angle of cleavage. If the other conditions are the same, the dense material, which is usually fine in crystal grains and adhered to each other, has higher strength. After the dense volcanic rocks are dry and saturated, there is no difference in compressive strength (water absorption is extremely low). In the case of porous and water-resistant cemented rocks, there is a significant difference in the strength of drying and moisture.
Disadvantages:
The bulk of the heavy walls of high-rise buildings are not completely standardized in the construction industry. Many of the stone curtain wall construction projects are the ones with the lowest construction costs, who win the bid, and have individual subcontracts. If you do not lose money, you will cut corners. The high-level (50- to 100-meter-high) stone curtain wall is really low-grade granite with 100-200 yuan per square meter. Is this not dangerous?
Many design institutes are not familiar with the curtain wall and draw a range on the drawing to indicate what the curtain wall is. The stone curtain wall is no exception. It is designed by the successful curtain wall company. Some design institutes ask the structural engineer to review it seriously. However, most design institutes take the formal review. Isn't it dangerous to design this design?
Each construction project, the country requires a supervision company to take charge of the quality, this is absolutely correct and necessary, is the key to ensure the quality of the project, but unfortunately many supervision engineers are civil engineers, do not understand the curtain wall, let alone stone curtain wall . This is because there is a lack of curtain wall materials in the supervision training materials. Many supervision engineers are retired technicians. Without training, they do not understand the supervision of the curtain wall. How can we put the final quality into consideration? Quality inspection stations in various regions often have difficulties in quality acceptance due to their lack of knowledge of new technologies.
The fireproof performance of stone curtain walls is very poor. Especially in high-rise buildings, fires are generally ignited in the room. The fire in the building will increase the temperature of the stainless steel plate and metal structure of the hanging stone plate, so that the steel will soften and lose its strength. The stone plate will be high-rise. The formation of a slate "rain" falls not only poses a danger to pedestrians, but also causes difficulty in fire fighting. This is just as the United States World Trade Center was hit and smashed, because the World Trade Organization is all steel structure, the steel has lost its strength due to high temperature softening, and the World Trade Center has fallen from top to bottom.
Second, the advantages and disadvantages of glass curtain wall
advantage:
The glass curtain wall is a new type of contemporary wall. The most important feature that gives the building is its organic integration of architectural aesthetics, architectural functions, building energy efficiency, and architectural structure. The building presents different shades of light from different perspectives. , moonlight, light changes give people dynamic beauty. There are magnificent glass curtain walls in major cities on all continents of the world, such as the New York World Trade Center, Chicago Oil Tower, and Sears Tower. The Hong Kong Bank of China Tower, Beijing Great Wall Hotel and Shanghai Lianyi Building have also been adopted.
Disadvantages:
Glass curtain wall also has some limitations, such as light pollution, energy consumption and other issues. In addition, the clear and transparent natural beauty of the glass curtain wall is not resistant to pollution, especially in the northern regions where the atmospheric dust content is large, air pollution is severe, and drought is scarce, the glass curtain wall is extremely susceptible to dust and dirt. This is not only impossible for the urban landscape. Increase "light", but lost "face." The material used was inferior, the construction quality was not high, and the color was uneven and the ripples were different. Due to the uncontrollability of light reflection, the light environment was disorderly. However, with the continuous emergence of new materials and new technologies, these problems are gradually being incorporated into the comprehensive research system of architectural modeling, building materials, and building energy conservation, as an overall design issue.
Third, the advantages and disadvantages of metal curtain wall
advantage:
The main products in the metal curtain wall are aluminum sheet curtains. Up till now, the aluminum curtain wall in the metal curtain wall has always dominated the metal curtain wall. The lightweight material reduces the load on the building and provides a good selection condition for high-rise buildings; Excellent anti-fouling and anti-corrosion performance ensures a long-lasting new exterior of the building; processing, transportation, installation and construction are all relatively easy to implement, providing strong support for its extensive use; diversity of colors and processing can be combined into different The shape of the exterior expands the designer's design space; the high performance-to-price ratio, easy maintenance, and long service life meet the owner's requirements. Therefore, aluminum curtain wall as a highly impacted architectural form, has become popular.
Disadvantages:
The deformation resistance of the curtain wall system: It is necessary to carry out scientific mechanical calculations for each important part of the curtain wall system, taking into account the influence of wind pressure, dead weight, earthquake, temperature, etc. on the curtain wall system, and the embedded parts, connection systems, keel systems, panels The fasteners are carefully checked to ensure the safety of the curtain wall.
Whether the plate adopts the floating connection; the floating connection ensures the restoration ability after the deformation of the curtain wall, ensures the integrity of the curtain wall, does not cause the deformation of the curtain wall due to the acting force, and avoids the occurrence of bulging or sinking of the surface of the curtain wall.
Plate fixing method: The fixing method of plates plays a decisive role in the smoothness of plate installation. The inconsistency of the force of each fixed point of the plate will cause the deformation of the surface material to affect the effect of the external decoration. Therefore, the fixing mode of the plate must be fixed by a distance and pressing to ensure the flatness of the surface of the curtain wall.
Whether there is reinforcement measures at the edge of the composite face material, because the fold of the composite panel material only retains the thickness of the front panel, the thickness becomes thinner, and the strength decreases. Therefore, there must be reliable reinforcing measures for the edge removal.
Whether the ribs are properly set on the back of the board to increase the strength and rigidity of the board. The arrangement distance of the reinforcement ribs and the strength and rigidity of the reinforcement ribs must meet the requirements to ensure the function and safety of the curtain wall.
Waterproof sealing method is reasonable: waterproof sealing method, waterproof structure, internal waterproof, plastic seal, different sealing methods are not the same price, choose the appropriate sealing method for the project, to ensure the function of the curtain wall and exterior effects.
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