How to distinguish true and false aluminum alloy glass curtain wall

First, what is called aluminum alloy glass curtain wall

Outside the building walls, glass sashes are suspended from aluminum alloy structural frames. This kind of aluminum alloy and glass wall is called aluminum alloy glass curtain wall. The self-weight and wind load of the curtain wall are transmitted to the aluminum alloy frame. Because the design pattern and grid are different, the curtain wall can get various different facade effects.

The aluminum alloy fixed window is an aluminum alloy glass body made of aluminum and glass in the middle of a building wall, and is called an aluminum alloy fixed window. It is different from aluminum alloy glass curtain wall in material, structure, manufacture and installation. The curtain wall has more material than the fixed window, and the complex cost of design and production is more than double. Some manufacturers named the fixed window "simple aluminum alloy glass curtain wall", purely deceptive. Many user plans are cheaper than fixed windows instead of curtain walls.

Second, the classification of aluminum alloy glass curtain wall

Aluminum alloy glass curtain wall generally represents a framed aluminum alloy curtain wall. There are aluminum alloy sashes around the glass. That is, the glass is embedded in the aluminum alloy sash. The weight and wind load of the glass are borne by the aluminum frame embedded in the glass and then transmitted to the aluminum alloy frame. . Aluminium-alloy glass curtain walls are aluminum alloy sashes without glass inserts, but are glued to the aluminum alloy sashes with a structural adhesive. Glass weight and wind load are transmitted from the glass to the aluminum alloy grid. Hidden-frame curtain wall is divided into two kinds: hidden and semi-hidden. Semi-hidden is divided into vertical and horizontal hidden and hidden vertical and hidden.

Third, the characteristics of aluminum alloy glass curtain wall

1. Material selection: According to the height of aluminum alloy glass curtain wall, the grid size, the local maximum wind load in different regions, the seismic coefficient, the maximum temperature difference between winter and summer sunshine and other factors to design and calculate how much need to use aluminum curtain wall profiles to meet the design load requirements.

2. The production of the curtain wall: According to the calculation of the selected curtain wall profile, according to the design grid size, the frame is made to be fixed on the outside of the wall. The thermal expansion and contraction of aluminum must be considered when making the frame. According to the degree of height and width of the curtain wall, consider how much of the contraction joint is left. The variation of the length of aluminum is generally expressed by ΔI=atI△T, ΔI length change, at-expansion coefficient, I aluminum length, ΔT temperature difference. From the formula, it can be seen that the longer the aluminum material, the greater the temperature difference between winter and summer, and the longer the aluminum length change. In order to ensure the firmness of the aluminum alloy glass curtain wall frame, adding a simple profile in the middle of the curtain wall aluminum profile (as shown in Figure 1) can ensure that the expansion joint can freely change due to temperature changes, thus ensuring the integrity of the frame.

3. Curtain wall installation

One installation method is to install components. First, vertical components are installed on the frame and aligned, and then the two horizontal components and the vertical components installed on both sides are connected to form a sash and finally set in the glass. This kind of installation is easy to transport and can only be installed outside the wall. It requires a scaffold or a special workbench. In addition, the installation method is based on the size of the sub-grid, first processing a single well-mounted glass frame, one by one hanging on the aluminum frame outside the wall, both inside and outside installation.

Regardless of which method is used for installation, it must be ensured that the airtightness, watertightness, wind pressure resistance and seismic resistance of the curtain wall must all meet the national standards. The above performance must be based on the test data.

Fourth, aluminum alloy fixed window is not a curtain wall, not a simple curtain wall

The aluminum alloy fixing window is by no means a curtain wall. This is totally different in the use of wood, production and installation of glass, and it cannot be said of the requirement of three sexes. Aluminum alloy square tubes or flat tubes used for window fixation instead of curtain wall profiles. The fixed windows are generally located in the middle of the building wall, and some of them are fixed outside the wall in order to deceive users. The aluminum alloy square pipe is used to form a grid, and an aluminum alloy bead or wood screw is used to fix the glass in the middle of the grid frame. Normal aluminum alloy square tube wall thickness of 1.3-1.4 mm, and some aluminum alloy square tube wall thickness of less than 1 mm, so that the thin wall thickness can bite the wood screw one or two buckle, wood screw can withstand much force? such as glass Is the grid large and the glass can be firmly fixed to the aluminum material? The glass of the curtain wall is embedded in a special aluminum groove, and the fixed window is pressed against the edge or point of the glass by a bead or wood screw, which cannot withstand the wind blow. Rain hit. This large area aluminum alloy fixing window gives people the appearance of a glass curtain wall, and it is most likely to deceive users who do not understand. We have found that designers of individual design institutes have also been deceived as simple curtain walls. What is even more ridiculous is the drawings. Indicate the simple aluminum alloy glass curtain wall. This kind of fixed window has a great potential for hidden dangers. First, there is no complete design and calculation, the connection of the grid is poor, the connection between the steel and the aluminum is more galvanic, the aluminum is destroyed, and the second is that the heat of the aluminum is not considered at all. Expansion and contraction, let alone stay on expansion joints. In some cities, the temperature difference between winter and summer is around 100°C, and the elongation of aluminum material is shortened. Therefore, the so-called simple curtain wall that was installed in summer often leads to a large area of ​​glass breakage in winter. More severely, the entire large fixed window tilts, bulges and breaks. The price per square meter of fixed windows is generally about half that of aluminum alloy glass curtain walls. Please do not be fooled by users.

Five, aluminum alloy hidden frame glass curtain wall

Aluminum alloy hidden frame glass curtain wall is the latest aluminum alloy glass curtain wall in the world. It is also a controversial new technology in the world. It is now banned in Germany and Japan. The surface of the curtain wall has no aluminum alloy frame, and the single-reflective coated glass used in the curtain wall forms a large glass mirror-type curtain wall. The sensory appearance is very strong. The wall surface can reflect the horses and water dragons on the road surface. The inside of the room can be seen outside from the outside of the glass. Because of this charm, our country has formed a hidden frame of curtain wall heat. This kind of curtain wall design, production and technical requirements for materials are particularly strict, and the degree of difficulty, technical complexity, and risk are also particularly high.

The aluminum alloy hidden frame glass curtain wall does not have an aluminum alloy outer frame for holding glass and bearing weight. It completely relies on the structural adhesive to stick hundreds of pieces of glass to the aluminum profile frame, and the gap between the glass is sealed with a sealant structure. Bonding.

1. Aluminum Alloy Hidden Frame Glass Curtain Wall Requirements for Profiles:

The design calculation of the aluminum alloy hidden frame glass curtain wall is very important. According to the astronomical data of each area, the strength requirements of the height of the curtain wall shall be calculated, and the appropriate profile of the aluminum alloy hidden frame curtain wall shall be selected. Profile section size is based on the calculated strength. Alloy grade LD31 (6063 abroad) T5 state, mechanical strength to meet national standards. The thickness of the profile oxide film of the hidden frame curtain wall adhesive should be higher than that of the 15μ oxide film. Anodized aluminum after electrophoretic painting, called aluminum surface electrophoretic paint, paint the purpose is to enhance the aluminum surface of the acid, but also increase the oxidation of the surface gloss, but for the hidden frame curtain wall, due to The aluminum material is stuck inside, the above effect is not obvious, and more importantly, no reliable data is shown at present, indicating how fast the lacquer layer and the oxide film are, because the weight of the glass and the wind load are transmitted by the glass through the film. Give structural adhesives. If the varnish is not adhered to the glass, it will fall off and cause serious consequences. Therefore, the use of electrophoretically painted aluminum materials in the hidden frame glass curtain wall should be particularly careful, and it is better to have a basis for reuse.

Aluminum surface treatment Another method for electrostatic spraying, spraying powder or liquid spray coating, its purpose is to improve the monotonous anodized white and bronze, can spray dozens of different colors, good acid and alkali resistance, powder The spray coating is made of polyurethane and resin, and has good impact resistance, friction resistance, and fading on the long-term irradiation surface of the sun. Liquid spray coating is carbon fluoride spray. This sprayed profile is suitable for high-rise buildings, is not afraid of prolonged exposure to ultraviolet light, and does not produce cracks. Carbon fluoride electrostatic spraying is widely used in foreign countries and is mostly used in aluminum curtain walls. Viscosity is applied to the sprayed surface to hide the curtain wall. How fast is the sprayed film? No data is seen. Be careful.

2. Coated Glass

There are several methods for glass coating. Twenty-one issues have been introduced. Thermal film is preferred. In the production process of float glass, the film has been coated with the film inside the glass. This coated glass can be bent into various arcs by heat, and it cannot be produced in the country. It is produced in the United States and Belgium. Most of the introductions in the country are vacuum sputtering coatings. The coating is applied to the glass surface. When the hidden frame glass curtain wall is applied with this kind of coating, the film is on the inside, and the structural glue is stuck on the coating. If the degree of firmness of the coating is not high, the coating will be stuck and the glass will fall off. Therefore, strict requirements are imposed on the coated glass. The Association proposes that the coated glass factory should issue a guarantee that it will not be stuck for at least ten years. At the same time, it is necessary to examine the advanced level of equipment of the coated glass factory, and the tests, especially the grinding test data. And to understand the source of the float glass used in coated glass, whether it is produced by the factory or produced by the manufacturer, or the original film bought by the company. The firmness of the coated glass film is closely related to the freshness of the original film. For example, if the original float glass film is produced within seven days, the same film coating equipment has the best coating effect. For example, if the coated film strength exceeds seven days, the firmness is significantly reduced. If the original glass is not fresh, even if it is issued with a 10-year warranty, it is necessary to consider whether or not it is reliable. Buy coated glass, especially coated glass for hidden glass curtain walls, to understand the above situation.

3. Silicone structural adhesive

Silicone structural adhesives are commonly used in the world: General Electric Company of the United States referred to as GE Corporation, the United States Tao Kang Ling, France, Rhone, Germany WACKER. China is still unable to produce structural adhesives. Silicone rubber structure is divided into two components of the two-component, two-component structure with large quantities of plastic, two-component need to hit the plastic machine, but the plastic machine is more expensive each about 30,000 US dollars, generally can use single-component Structural adhesives can be used for simple manual punching machines. GE's one-component adhesives are GE4000's storage period of one year. Tao Kangling's DC795 storage period is six months. France's Rhone CEC70a's storage period is six months, which means it must be stored for a period of time. Used up, expired expired.

Six, various types of false frame glass curtain wall

Many hidden glass curtain walls can be seen everywhere in China. In particular, there are reflective glass curtain walls with hidden areas of different sizes in the commercial areas of some downtown commercial areas. Many store managers can't name the curtain walls. They look at other people doing good-looking things. They also have to do. Some decoration companies originally only do internal and external decoration. They don't understand the hidden frame walls. They don't know whether to ask or not to learn and take it for granted. The following situations.

1. Replace aluminum with steel; use ordinary sealant instead of structural adhesive to make a false hidden frame curtain wall, such as the hidden frame curtain wall made by Beijing Daxing Decoration Company. Steel should be rusted. 333 is a general sealant. It is not structural adhesive that can't be stuck. So Daxing County Decoration Company Manager said that he dares to guarantee five years.

2. Steel is used as a grid, and coated glass is generally glued to the foam board and plywood, and the foam board and plywood are fixed on the angle steel welded grid. Such as Inner Mongolia Baotou City, Kun District, Wujinjiaodian company sales department, completed less than two months all broken glass.

3. Instead of curtain wall profiles made of aluminum alloy square tube made of a grid, with a general adhesive coating glass, can not stick in the middle of the two glass with a small steel sheet and wood screws hit the hoop, by wood screws in about 1 mm thick aluminum on one or two A silk buckle, pull the coated glass, such as Jiangsu Wuxi County Dongfangzhuang Hardware Factory Dongming Hotel on the sidewalk above the production of "hidden frame glass curtain wall", at any time fall out of the glass to hurt people.

4. In the production of hidden frame glass curtain wall, not to be used for aluminum alloy, glass, rubber strip and structural adhesive compatibility test, adhesion test, not in accordance with the regulations of the outdoor plastic, with a small section of aluminum instead of normal aluminum profile Materials, with outdated structural adhesives, with general plastic instead of sealed structural adhesives are almost visible to the provinces.

We hereby appeal to everyone to pay attention to and review the hidden glass curtain wall. Please look up and see if there is a pseudo-concealed curtain wall made of steel at the top of your storefront. Do not simply pursue a large mirror effect. Pay attention to whether or not you guarantee quality.

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