[China Glass Net] The glass curtain wall is the choice of most high-end buildings at present. Compared with the cement wall tiles, the glass curtain wall looks more beautiful, but the frequent occurrence of the glass curtain wall also makes people realize that the beauty is beautiful, but also There are disadvantages.
1. Safety is not guaranteed. The glass curtain wall is currently difficult to be secured in terms of safety. On May 9, 2016, in the Shanghai Tower, the glass curtain wall dropped debris and injured passers-by. However, this accident is not a special case. In many buildings, the glass curtain wall has been worn out, cracked or even fallen off. These safety hazards threaten people's safety.
2. The solution is difficult to implement, and relevant measures have been promulgated on the safety of the glass curtain wall to avoid the curtain wall falling. The "Technical Specifications for Glass Curtain Wall Engineering" proposes that after one year of completion and acceptance of the curtain wall project, a comprehensive inspection of the curtain wall project should be carried out; it should be inspected every five years thereafter. The "Measures for the Safety Maintenance of Existing Building Curtain Walls" is more clear, and the owner responsibility system is implemented for the safety maintenance of glass curtain walls. "In addition to quality defects, the glass curtain wall after the acceptance of delivery will cause casualties, and the industry mainly bears compensation." However, in practical applications, the inspection and maintenance price of the glass curtain wall is not low, and the 25-year use period is after the expiration. The replacement cost is even greater. As a result, some owners are reluctant to pay these fees to ensure the safety of the curtain wall, resulting in inadequate implementation.
3. Design Barriers Today's glass curtain walls provide designers with a beautiful and easy to use design material. Many designers rely on glass curtain walls in their designs to embody their creativity with glass. In fact, although the glass curtain wall brings comfort to the people in the landscape, the frequent use of the glass curtain wall makes the architectural design monotonous, causing a phenomenon on the thousandth floor. Instead of reflecting his own creativity, he became dependent on the glass curtain wall and became a veritable photo of the gourd painting.
So, how to choose a glass curtain wall reasonably?
Insulation performance
The insulation and energy saving effect of the architectural glass curtain wall is inferior to the traditional enclosure structure. To achieve the purpose of heat preservation and energy conservation, it is necessary to reduce the overall heat transfer coefficient of the curtain wall. The heat transfer coefficient is composed of glass, profile and the linear heat transfer coefficient Y value of the edge of the insulating glass. That is, the heat-insulating profile and the insulating glass are mainly considered in the structural design. Since the curtain wall glass accounts for a large proportion of the curtain wall area, the heat transferred through the glass is much higher than the other envelope structures in the entire envelope structure. The article only discusses the curtain wall glass.
The thermal performance of the glass is characterized by two parameters, the heat transfer coefficient and the shading coefficient. The heat transfer coefficient is a general parameter of the envelope structure, and the lower the heat transfer coefficient, the more conducive to building energy conservation. The shading coefficient is a special parameter of the glass as the envelope structure. The smaller the shading coefficient, the better the performance of blocking direct sunlight radiation.
Sound insulation performance
The sound insulation level of the curtain wall of the general building is grade 3, and the all-glass curtain wall adopts 10~19mm single-piece glass and ordinary insulating glass can meet the requirements. If the air sound insulation level is required to reach level 4, the ordinary configuration of hollow glass is afraid. It is difficult to meet the requirements. In order to improve the sound insulation performance of the insulating glass, it is necessary to find a solution in the structure of the insulating glass, as follows.
(1) Use a soft connection to avoid the sound bridge phenomenon.
(2) Increase the damping of the glass. Pvb film has a certain hindrance to sound waves, thus effectively blocking the propagation of sound. If a laminated glass structure is used to synthesize an insulating glass structure, its effect of increasing the glass damping will be greater.
(3) Asymmetric glass is used. Since the glass material, size, thickness and boundary constraints are the same, each layer of glass has the same natural frequency and is easy to generate resonance, thereby exciting the low frequency vibration of the glass itself to generate secondary noise radiation.
Safety performance
The glass is easily broken by temperature or impacted by external forces, as is tempered glass. In the use of laminated glass, it is also necessary to consider that the curtain wall should not become a fire cage due to the laminated glass. The tempered glass should be designed in an appropriate place and set with obvious signs to escape in the event of a fire. In addition, when designing the frame type glass curtain wall, it is necessary to use a sealant to seal the seal. Due to the insufficient rigidity of the PVB film, a certain amount of tensile force should be applied to the glass at the edge of the frame. Also consider increasing the depth of the notch to prevent the glass from falling off the notch.
External appearance
The glass curtain wall is the outer structure of the building and the outerwear of the building. The architect uses his rich colors and artistic style to express the design concept and create colorful artistic effects.
Tempered and heat-strengthened glass can form ripples due to heat. When observing the reflected light of tempered (or semi-tempered) glass under some special natural light conditions, it can be seen that there are bright and dark stripes on the surface. For stress spots. At present, more advanced technologies in the world cannot completely eliminate stress spots. To change this effect, you can use chemically tempered glass and choose laminated glass or semi-tempered laminated glass.
The use of glass curtain wall should not be ruined. If it is comprehensively considered from the aspects of thermal insulation performance, sound insulation performance, safety performance and external vision, it can greatly reduce the accident rate in the future.
Woven Pants,Simple Breathable Woven Pants,Men Woven Streetwear Pants,Simple Breathable Woven Pants
Shaoxing Tongbang Textile Co.,Ltd. , https://www.sxtongbangtextile.com