1. What is an aluminum alloy glass curtain wall?
Outside the building wall, the glass lattice is suspended from the aluminum alloy structural frame. This kind of wall composed of aluminum alloy and glass is called aluminum alloy glass curtain wall. The dead weight and wind load of the curtain wall are transmitted to the aluminum alloy frame. Due to the different design types and divisions of the curtain wall, various facade effects can be obtained.
Aluminum alloy fixed windows are aluminum alloy glass bodies made of aluminum and glass in the middle of the building wall. They are called aluminum alloy fixed windows. It is not the same as the aluminum alloy glass curtain wall in terms of materials, structure, manufacturing and installation. The curtain wall uses more materials than fixed windows, and the design and production cost is more than twice as complex. Some manufacturers name fixed windows "simple aluminum alloy glass curtain wall", which is purely deceptive. Many users use cheap fixed windows instead of curtain walls.
2. Classification of aluminum alloy glass curtain wall
Aluminum alloy glass curtain wall generally represents a framed aluminum alloy curtain wall. There is an aluminum alloy frame around the glass, that is, the glass is embedded in the aluminum alloy. Within the frame, the self-weight of the glass and wind load are borne by the aluminum frame embedded in the glass and then transmitted to the aluminum alloy frame. Aluminum alloy glass curtain wall does not have aluminum alloy frames embedded with glass, but is glued to the aluminum alloy frames with structural adhesive. The self-weight of the glass and the wind load are transferred from the glass to the aluminum alloy frame through glue. Concealed frame curtain walls are divided into two types: fully concealed and semi-concealed. Semi-concealed can be divided into two types: vertical concealment and horizontal concealment, and horizontal concealment and vertical concealment.
3. Characteristics of aluminum alloy glass curtain wall
1. Material selection: Based on the height of the aluminum alloy glass curtain wall, the size of the cells, the maximum local wind load in different regions, the earthquake coefficient, the maximum temperature difference between winter and summer sunlight, etc., the design is calculated to calculate the size of the aluminum alloy curtain wall profile section required to meet the design load requirements.
2． Curtain wall production: According to the calculated curtain wall profiles, according to the designed grid size, a frame is made and fixed on the outside of the wall. Be sure to consider the thermal expansion and contraction of aluminum when making the frame. Depending on the height and width of the curtain wall, the size of the shrinkage joint should be considered. The length change of aluminum material is generally expressed by △I=atI△T, △I length change, at expansion coefficient, I aluminum material length, △T temperature difference. It can be seen from the formula that the longer the aluminum material, the greater the temperature difference between winter and summer, and the greater the change in the length of the aluminum material. In order to ensure the firmness of the aluminum alloy glass curtain wall frame, simple profiles are added in the middle of the curtain wall aluminum profiles (as shown in Figure 1) to ensure that the expansion joints can change freely due to temperature changes, thus ensuring the integrity of the frame.
3． Installation of Curtain Wall Glass
One method of installation is by component. First, install the vertical components on the frame and align them, then connect the two horizontal components with the installed vertical components on both sides to form a frame, and finally insert the glass. This kind of installation is easy to transport and can only be installed outside the wall, requiring scaffolding or a special workbench. In addition, the installation method is to process individual glass-lined frames according to the size of the cells, and then hang them one by one on the aluminum alloy frame outside the wall. They can be installed both inside and outside.
No matter which installation method is used, the air tightness, water tightness, wind pressure resistance and earthquake resistance of the curtain wall must all comply with national standards. The above performance must be based on testing data.
4. Aluminum alloy fixed windows are not curtain walls, let alone simple curtain walls
Aluminum alloy fixed windows are by no means curtain walls. They are completely different in terms of materials, production and installation of glass, let alone three. sexual requirements. Aluminum alloy square tubes or flat tubes for fixed windows instead of curtain wall profiles. Fixed windows are generally installed in the middle of the building wall. Some also install fixed windows outside the wall in order to deceive users. Use aluminum alloy square tubes and flat tubes to form a grid, and use aluminum alloy battens or wood screws to fix the glass in the middle of the grid. The normal wall thickness of aluminum alloy square tubes is generally 1.3-1.4 mm. Some aluminum alloy square tubes have a wall thickness of less than 1 mm. Such a thin wall thickness can bite a wood screw or two. How much force can a wood screw withstand? For example, when glass is broken The grid is large, can the glass be firmly fixed on the aluminum? The glass of the curtain wall is embedded in a special groove for the aluminum, and the fixed window uses battens or wood screws to press one edge or one point of the glass, which cannot withstand the wind. Rain hits.
At the same time, the advanced equipment level of the coated glass factory and various tests, especially the grinding test data, should be inspected. It is also necessary to understand the source of the float glass used in coated glass, whether it is the original film produced by our own factory or a nearby manufacturer, or whether it is the original film purchased from thousands of miles away. The strength of the coated glass film is closely related to the freshness of the original film. For example, if the original float glass is produced within seven days, the coating effect of the same coating equipment will be the best. If it exceeds seven days, the coating film will be significantly less fast. The original glass is not fresh, so even if a ten-year guarantee is issued, you still have to consider whether the guarantee is reliable. When buying coated glass, especially coated glass for hidden frame glass curtain walls, you must understand the above conditions.
3． Silicone structural adhesive
The commonly used silicone structural adhesives in the world are: American General Electric Company, referred to as GE Company, American Tao Kangling Company, French Rh?ne Company, and German Wacker. Our country is not yet able to produce structural adhesives. Silicone structural adhesives are divided into two types: two-component and one-component. Large quantities use two-component structural glue. Two-component glue requires a glue machine, but the glue machine is more expensive, about 30,000 US dollars each. Generally, single-component glue can be used. For structural glue, a simple manual glue machine can be used. GE's single-component glue has a storage period of one year for GE4000, Tao Kangling's DC795 has a storage period of six months, and French Rhone CEC70a has a storage period of six months, which means it must be within the storage period. When used up, it expires.
6. Various types of false hidden frame glass curtain walls
Many hidden frame glass curtain walls can be seen everywhere in China. Especially in some cities' downtown business districts, there are reflective glass curtain walls of varying sizes above the shop facades, that is, hidden frame glass curtain walls. Many store managers can't name curtain walls, and they have to do it even if others do it to look good. Some decoration companies only do interior and exterior decoration, but they don't understand the hidden frame curtain walls. They don't know how to do it, don't ask, don't learn, and just take it for granted. This is the problem. The following situations.
1. Use steel instead of aluminum; use ordinary sealant instead of structural glue to make a fake hidden frame curtain wall, such as the hidden frame curtain wall of Fengshengyuan Restaurant produced by Beijing Daxing Decoration Company. If steel is going to rust, 333 is a general sealant, not a structural glue that won't stick at all. The manager of the Daxing County Decoration Company said he can guarantee it for five years.
2． Steel is used as the grid, and the coated glass is glued to the foam board and plywood with general glue, and then the foam board and plywood are fixed to the angle steel and welded into the grid. For example, at the Wujinjiaodian Sales Department in Kun District, Baotou City, Inner Mongolia, all the glass was broken within two months of completion.
3． Use aluminum alloy square tubes instead of curtain wall profiles to make a grid. Use ordinary adhesive coated glass. If it cannot stick to the middle of the two pieces of glass, use a small steel sheet and wood screws to make a hoop. Use the wood screws to place one or two on the aluminum material about 1 mm thick. A threaded buckle is used to pull the coated glass, such as the "hidden frame glass curtain wall" made by the Dongjiang Decoration Hardware Factory in Wuxi County, Jiangsu Province for the Dongming Hotel above the sidewalk. There is a risk of the glass falling at any time and injuring people.
4. In the production of hidden frame glass curtain walls, there is no compatibility test and bonding test of aluminum, glass, strips and structural adhesives. If the glass curtain wall is not made according to the regulations and is glued outdoors, small-section aluminum should be used instead of normal-section aluminum. Materials, the use of expired structural glue, and the use of ordinary glue instead of sealing structural glue can be seen in almost all provinces.
We hereby call on everyone to pay attention and review the hidden frame glass curtain wall. Please look up and see if there is a false hidden frame curtain wall made of steel above your shop. Don't just pursue the large mirror effect, but pay attention to whether the quality is guaranteed.