[China Glass Net] As a unique design in modern architecture, the glass curtain wall not only reflects the better combination of architecture and aesthetic structure design, but also perfectly reflects the various functions of glass. For example, the transparency of the glass curtain wall is better through the glass line of sight, and the field of view is larger, so that the environment inside and outside the building is connected and integrated. The glass curtain wall has good process performance, the glass curtain wall support member is meticulously processed, the surface is smooth, and has a good sense of craftsmanship and art. It can adapt to any geometric shape and produce rich changes in the building shape, which can fully reflect the designer's imagination and creativity. . One of the big highlights of the current use of glass curtain walls is that the use of various energy-efficient curtain wall glass greatly reduces the energy consumption of buildings. Despite this, in the past period, many construction projects have been plagued by glass curtain walls. Some glass curtain walls with unreasonable design, material selection and construction have been widely used by the community due to problems such as glass breakage, glass fall, and water leakage. attention.
Due to various unreasonable applications, glass curtain wall has many problems, such as high self-explosion rate of tempered glass, failure of structural adhesive, poor fireproof performance of curtain wall glass (ordinary), failure of glass curtain wall support structure, failure of glass curtain wall fixture, etc. The following Chinese curtain wall network ALwindoor.com will analyze and demonstrate various security misunderstandings in the glass curtain wall, and discuss with you how to solve the problem.
There are many reasons for causing glass breakage. First, the analysis and demonstration of glass cracking caused by nickel sulfide and thermal stress are first carried out.
First, the glass burst caused by the impurity nickel sulfide
The editorial department of China's curtain wall network consulted Mr. Niu Xiao, an expert on the aluminum door and window curtain wall committee, on this issue. He introduced that nickel sulphide is an inevitable harmful impurity in the production of glass. Nickel sulphide itself does not cause any damage to the glass. However, when the curtain wall glass containing nickel sulphide is installed on the curtain wall, the volume of nickel sulphide is generated due to the increase of external temperature. Minor changes cause tiny cracks inside the glass. These cracks pass through the tension layer of the tempered glass and release the internal energy, causing the glass to break.
The solution is to start with the source, the glass manufacturer should monitor the glass manufacturing process to minimize the contact between the nickel-containing materials and the glass raw materials. Secondly, after the installation of the curtain wall glass, there is a technology for detecting the presence of nickel sulfide impurities by photography. If it is necessary, the necessary replacement should be carried out in time to prevent the glass from being damaged after being broken. It is also possible to replace the single-piece tempered glass and the tempered insulating glass with laminated glass. If the nickel sulfide impurities are broken due to deformation, the fragments are still adhered to the film, and glass rain is not formed to cause damage to the ground personnel.
Second, the glass broken by thermal stress
Thermal stress is an important cause of glass curtain wall breakage. According to Mr. Liu Zhongwei, an expert on the aluminum door and window curtain wall committee, there are many reasons for the heating of the glass curtain wall, but the main heat source is sunlight. When the sunlight shines on the surface of the glass curtain wall, the glass will be heated and expanded. If the glass is evenly heated, the glass edge and The central part of the glass expands uniformly at the same time, but if the edge and the inside of the glass are unevenly heated, tensile stress will be generated inside the glass. When there are cracks or micro cracks on the edge of the glass, these defects are easily affected by thermal stress. As the temperature difference increases, the thermal stress causes the crack to gradually increase and later causes the glass to break.
The solution is to first finish the edge of the glass, using fine edging or polishing edges to reduce the existence of micro cracks; secondly, to temper the glass to enhance the glass's ability to resist temperature changes; the third is During the processing, handling and installation of glass, the glass must be properly protected. Be careful not to collide and rub the edge of the glass with other hard objects. Strictly follow the operating procedures, especially during the installation process, if the frame is not suitable (too small or Distorted deformation, be sure not to pinch the corners of the glass with pliers, be sure to correct the frame to fit the size of the glass.
Third, the glass curtain wall has poor fireproofing ability
The glass curtain wall is a non-combustible material, but in the face of fire, it can soften or even melt. Therefore, in the architectural design, we must fully consider the fire protection requirements of the building. The general glass curtain wall has a low fireproof effect, fire-resistant integrity, and low fire-resistance. In a fire, the glass breaks in a short time.
Solution: In the actual construction process, the designers carry out different designs according to different fire protection requirements of the building. For buildings with general fire protection requirements, the glass is made of glass brick, tempered glass, small flat glass, etc. For buildings with high fire protection requirements, the curtain wall glass uses brushed glass, single piece fireproof glass, composite fireproof glass, fireproof insulating glass and the like. Composite fireproof glass is currently widely used in fireproof curtain wall glass. Among the several fireproof glass manufacturers in the domestic market, King Kong glass is more prominent in overall fireproofing and flame retardant performance, because when a fire occurs, at a certain time The inner fire surface glass is thermally cracked, but due to the presence of the fireproof film, the glass is adhered to the film without falling, maintaining the integrity of the glass. At the same time, because the film itself has a fireproof effect, it not only blocks the fire spread, but also ensures that the temperature of the backfire surface does not rise rapidly and controls the spread of fire.
Fourth, the curtain wall glass structural adhesive failure
Because the glass curtain wall has long been affected by the unfavorable factors of the natural environment, such as wind, sun, rain, ultraviolet radiation, earthquakes, etc., it is required that the glass curtain wall must have weather resistance, durability, corrosion resistance, as a bonding material. Structural glue has become the focus of attention. In cities such as Beijing, Shanghai, Guangzhou, etc., where glass curtain walls were used earlier, curtain wall glass fall occurred. How to determine whether a piece of glass structural glue is invalid can be said to be difficult, but to ensure the safety of personnel and vehicles, If a large area of ​​glass curtain wall is to be replaced by a huge expenditure, in the face of this situation, the owners are in a dilemma.
Solution: Firstly, limit the use of hidden glass curtain wall. It is necessary to protect the glass curtain wall that has passed the quality guarantee period. For example, fences, green belts and hanging curtains are installed around the glass curtain wall to prevent falling glass damage and passing pedestrians. And vehicles. The second is to use the bright frame and semi-hidden frame glass curtain wall as much as possible, because even if the structural adhesive fails, the chance of glass falling will be greatly reduced due to the support and constraints of the frame. At the same time, we should pay attention to the brand identity of domestic certified plastics. In the past 20 years, China's building structure silicone rubber has a series of certification parameters and standards. It is used in the industry to control the quality of structural rubber products, uniform performance standards, and improve glass curtain wall. The safety of glue, Guangzhou Baiyun and Zhengzhou Zhongyuan, which appeared earlier in the domestic structural rubber, the rising star of the industry, Hangzhou Zhijiang, Chengdu Silicon Bao, Antai Construction Adhesive, and emerging power Shandong Yongan, all reached the structural adhesive performance and testing quality standards. Or beyond international standards.
Fifth, the glass curtain wall support structure is invalid
Not all problems with glass curtain walls are caused by the glass itself. Sometimes the failure of the frame structure supporting the glass can also cause safety problems in the glass curtain wall. The frame structure used to support the glass is often the weak link of the glass curtain wall. If the design of the original frame system is unreasonable, the frame structure cannot withstand the pressure inside the building, and then the deformation occurs, which eventually leads to glass breakage.
The solution is to anti-fatigue experiments on the frame structure during the design process, and then design the corresponding curtain wall glass according to its anti-fatigue ability to prevent the frame from overloading for a long time. Referring to the structural rationality of the frame, it is inseparable from the application of aluminum profiles, as the birthplace of high-quality aluminum profiles in China. Guangdong: a first-class brand with Jianmei, Weichang, Aluminium, Weiye, Xinhe, etc.; Because of the innate advantages of the electrolytic aluminum industry chain and resources in Shandong Province, famous brands including: Huajian and others have emerged.
Sixth, the glass curtain wall fastener fixing device is invalid
All glass curtain walls rely on fasteners to assemble the curtain wall and secure it to the building. However, the unpredictable defects of the fastener fixing device may cause serious structural problems and even cause the curtain wall glass to fall.
Solution: Before installing the glass curtain wall, carry out the necessary inspection on the fasteners. After the inspection is passed, it can be installed and used on site. In addition, for the curtain wall glass falling caused by the loose bolts, we use special lock nuts to lock the bolts during the actual construction process to prevent the bolts from slipping down, or use specific washers to ensure that the bolts do not fall off after tightening. Fasteners, fasteners and other curtain wall hardware fitting systems need to have a unified integrity. The combination of the use and effect is expected to be excellent, it must be managed by the manufacturer to focus on quality control, in the aspect of curtain wall hardware, the domestic is better. Non-Jianlang Hardware, Hehe Construction Hardware, Chunguang Hardware, Lixing Yangshi, Xing Samsung Hardware are the only ones.
Other problems caused by the glass curtain wall
The glass curtain wall has caused more than the above problems. Due to the large-scale use of the glass curtain wall, light pollution, color pollution and heat pollution are some problems that cannot be ignored. Although glass curtain walls have such problems or problems, as designers, producers, and users have to fully understand them, and to avoid weaknesses, the glass curtain walls are therefore light in structure, easy to maintain, and beautiful. The choice of retaining structure, at the same time, is also a bright spot in modern architecture.
Invisible Sock,Women Invisible Socks,Cotton Invisible Socks,Women Invisible Jacquard Socks
Jingjiang Pingdong Import&Export Co.,Ltd , https://www.jingjiangsocks.com