The curtain wall is the outer wall of the building. It is not load-bearing and hangs like a curtain, so it is also called "curtain wall". It is a lightweight wall with decorative effects commonly used in modern large and high-rise buildings. It is composed of panels and supporting structure systems, which can have a certain displacement ability relative to the main structure or have a certain deformation ability itself, and do not undertake the role of the main structure. a kind).

With the rapid development of my country's national economy and the continuous improvement of people's living standards, as well as the improvement of the architect's design concept "human nature in architecture", buildings are developing more and more in the direction of high-rise, high-end and multi-functional. Therefore, building curtain wall products must also develop in the direction of high technology and multi-function, in order to adapt to people's increasing awareness of environmental protection and energy saving, and meet the market's demand for building curtain wall functions.

Double-layer curtain wall or ventilated curtain wall, as a more popular building envelope structure, originated in North America and has been widely used in Europe. In terms of ventilation methods, it can be divided into two systems: internal ventilation and external ventilation. The outer layer of the double-layer curtain wall with internal ventilation is a closed structure, and the ventilation is carried out in the two-layer space of the curtain wall. Usually, the cooperation with the centralized forced ventilation system can be exchanged with nature to achieve the final effect. The internal ventilation double-layer curtain wall system is widely used in Italy; the external ventilation relies on the outside air of the building, rationally organizes the airflow through the air inlet and outlet of the double-layer curtain wall, and directly exchanges with nature to achieve the final effect. Externally ventilated double-layer curtain walls are widely used in Germany and the United Kingdom.

The ventilation height of the curtain wall may be the height of a single storey, a multi-storey or even an entire building, or some combination of the above. The most common is the single-storey height structure, the advantages of single-storey double-layer curtain wall: separate fire, smoke, smell and noise between floors, and easy to achieve standardized design and production of curtain wall units.

In temperate climates such as continental Europe and the United Kingdom, double-layer curtain walls are widely used in the construction industry. Experts in the construction industry believe that double-layer curtain walls can reduce cooling load, facilitate good natural ventilation, facilitate lighting, control noise, and reduce thermal energy consumption.

Generally speaking, the cost of double-layer curtain wall is much higher than that of ordinary curtain wall, so it is necessary to explore a new curtain wall structure, which not only has the advantages of double-layer curtain wall, but also has the economy of ordinary curtain wall.

This article introduces a building curtain wall structure that has been used in foreign countries for reference by curtain wall designers.

The economical double-layer ventilation curtain wall adopts the structural form of an integral unit system, and the spacing between the inner and outer curtain wall panels is 155mm. The whole system structure is light, concise and economical. The curtain wall frame adopts aluminum alloy keel, which is processed, produced and assembled in the factory; the surface material is made of insulating glass, single-layer glass and lined with thermal insulation decorative board; The hardware accessories of the alloy contact parts are made of stainless steel. It is then transported to the site and hung directly on the main structure of the building.

Glass curtain wall refers to a building outer protective structure or decorative structure composed of a supporting structure system and glass, which can have a certain displacement capacity relative to the main structure and does not share the role of the main structure. There are single and double glazed walls. The reflective insulating glass is 6mm thick, and the wall weight is about 40kg/㎡. It is light and beautiful, not easy to pollute, and saves energy. The inner side of the outer glass of the curtain wall is coated with colored metal coating. From the appearance, the entire outer wall is like a mirror, reflecting the sky and the surrounding environment. When the light changes, the image is colorful and infinite. Under the reflection of light, the interior is not exposed to strong light, and the vision is soft. It was first used in the Great Wall Hotel project in Beijing in 1983.

People who have been to New York in the United States will be impressed by its prosperous urban style. The towering skyscrapers are magnificent, and its full-body glass curtain wall reflects the empty blue sky and dancing white clouds, adding to it. Brilliant colors. So, how is the glass curtain wall made? Glass curtain wall refers to the mirror glass used as building exterior decoration. It is made by adding trace amounts of Fe, Ni, Co, Se, etc. to the composition of float glass, and tempered to make color transparent plate glass, which can absorb infrared rays and reduce The solar radiation entering the room reduces the indoor temperature. It both reflects light like a mirror and transmits it like glass.

The glass curtain wall of modern high-rise buildings also adopts insulating glass which is composed of mirror glass and ordinary glass, and the interlayer is filled with dry air. Two-layer insulating glass is divided into two layers and three layers. Two-layer insulating glass is composed of two layers of glass and a sealing frame to form an interlayer space; three-layer glass is composed of three layers of glass to form two interlayer spaces. Insulating glass has the advantages of sound insulation, heat insulation, frost resistance, moisture resistance, and high wind pressure resistance. According to the measurement, when the outdoor temperature is -10°C, the temperature in front of the single-layer glass window is -2°C, while the indoor temperature using triple-layer insulating glass is 13°C. In summer, double-layer insulating glass can block 90% of solar radiation heat. Sunlight can still pass through the glass curtain wall, but it will not feel hot on the body. Rooms with hollow glass curtain walls can be warm in winter and cool in summer, which greatly improves the living environment. The middle PC sunlight glass - PC board, can withstand high temperature up to 135 degrees and low temperature -45 degrees.