Analysis of six potential safety hazards of glass

2022-08-24
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Analysis: six potential safety hazards and solutions of glass curtain wall

as a unique design in modern architecture, glass curtain wall not only reflects the best combination of architecture and aesthetic structural design, but also perfectly reflects the various functions of glass. Such as the permeability of the glass curtain wall, the best line of sight through the glass, the maximum field of vision, so that the internal and external environment of the building is connected and integrated. The glass curtain wall has good process performance. The supporting components of the glass curtain wall are carefully processed, and the surface is smooth. It has a good sense of craft and art, and can adapt to any geometric shape. In terms of building shape, the Ministry of industry and information technology has introduced rich changes in the use of norms and policies around new materials, which can fully reflect the imagination and creativity of designers. At present, the biggest highlight of the use of glass curtain wall is that the use of various energy-saving curtain wall glasses has greatly reduced the energy consumption of buildings. Nevertheless, in the past period, many construction projects have been plagued by glass curtain walls. Some glass curtain walls have attracted the attention of all sectors of society because of their glass breakage, glass falling and other problems

glass curtain wall is prone to many problems, such as glass breakage, structural glue failure, poor fire resistance performance of glass curtain wall, failure of supporting structure of glass curtain wall and failure of fixing device of glass curtain wall, etc. next, we will analyze and prove various problems existing in glass curtain wall, and explore ways to solve them

glass cracking caused by impurity nickel sulfide

there are many reasons for glass breakage. The following mainly analyzes and demonstrates the glass breakage caused by impurity nickel sulfide and thermal stress

nickel sulfide is an inevitable harmful impurity in the process of glass production. Nickel sulfide itself has no damage to the glass, but when the curtain wall glass containing nickel sulfide is installed on the curtain wall, due to the increase of external temperature, the volume of nickel sulfide changes slightly, causing tiny cracks in the glass. These cracks release the internal energy through the tension layer of tempered glass, Cause the glass to break

the solution is to start from the source. Glass manufacturers should monitor the whole process of glass manufacturing to minimize the contact between nickel containing materials and glass raw materials. Secondly, for the monitoring of curtain wall glass after installation, foreign countries have the technology of photographing to detect the existence of nickel sulfide impurities. If it contains nickel sulfide impurities, it is necessary to replace it in time to prevent people from being injured after the glass is broken. Single piece tempered glass and tempered insulating glass can also be replaced with laminated glass. At this time, if nickel sulfide impurities cause glass breakage due to deformation, the fragments will still adhere to the film, so as not to form glass rain and cause damage to ground personnel

glass breakage caused by thermal stress

thermal stress is an important reason for glass curtain wall breakage. There are many reasons why the glass curtain wall is heated, 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 heated evenly, the glass edge and the central part of the glass will expand evenly at the same time. However, if the edge and the interior of the glass are heated unevenly, tensile stress will be generated in the interior of the glass. When there are cracks or micro cracks on the glass edge, these defects are easy to be affected by thermal stress, With the increase of temperature difference, the cracks caused by thermal stress gradually increase, and finally lead to glass breakage

the solution is to finish the glass edge first "According to the previous report obtained according to the 1997 version, fine grinding or polishing edges are used to reduce the existence of micro cracks; secondly, the glass is tempered to enhance the resistance of the glass to temperature changes; thirdly, in the process of glass processing, handling and installation, the glass must be properly protected, pay attention not to collide and rub the glass edge with other hard objects, and strictly abide by the operating procedures, especially in the installation process If the frame is not suitable (too small or distorted), remember not to clamp off the corners of the glass with pliers, and be sure to correct the frame to adapt to the size of the glass

poor fire resistance of glass curtain wall

glass curtain wall is a non combustible material, but it can soften or even melt in the face of fire. Therefore, the fire protection requirements of buildings must be fully considered in architectural design. Generally, the fire prevention effect, fire integrity, fire resistance and heat insulation of glass curtain wall are very low, and glass breakage will occur in a very short time in a fire

the solution is that in the actual construction process, designers carry out different designs according to different fire protection requirements of buildings. For buildings with general fire protection requirements, glass bricks, tempered glass, small flat glass, etc. are used for the glass. For buildings with relatively high fire protection requirements, the curtain wall glass adopts wired glass, monolithic fire-proof glass, composite fire-proof glass, fire-proof insulating glass, etc. Composite fire-proof glass is the most widely used fire-proof curtain wall glass at present. When a fire occurs, the glass facing the fire surface will be heated and burst within a certain period of time. However, due to the existence of fire-proof film, the glass is adhered to the film and does not fall, maintaining the integrity of the glass. At the same time, because the film itself has the function of fire prevention, it not only blocks the spread of the fire, but also ensures that the temperature of the back fire surface does not rise rapidly and controls the spread of the fire

failure of glass structural adhesive of curtain wall

because glass curtain wall has been affected by adverse factors of natural environment for a long time, such as wind, sun, rain, ultraviolet radiation, earthquake, etc., it is required that glass curtain wall must have weather resistance, durability and corrosion resistance. As a bonding material, structural adhesive has become the focus of attention. In Beijing, Shanghai, Guangzhou and other cities that first used glass curtain walls, curtain wall glass falling events occur from time to time. It can be said that it is even more difficult to determine whether a piece of glass structural adhesive is invalid, but to ensure the safety of personnel and vehicles, if you want to replace the glass curtain wall in a large area, it is a huge expenditure. In the face of this situation, the owner is in a dilemma

the solution is to first restrict the use of hidden frame glass curtain walls, and the glass curtain walls that have passed the warranty period must be protected, such as setting up fences, green belts, and hanging curtains around the glass curtain walls to prevent falling glass from injuring pedestrians and vehicles. Secondly, open frame and semi hidden frame glass curtain walls should be used as much as possible, because even if the structural adhesive fails, the probability of glass falling will be greatly reduced due to the support and restraint of the frame

failure of supporting structure of glass curtain wall

not all problems of glass curtain wall are caused by the glass itself, and sometimes the failure of frame structure supporting glass will also cause problems of glass curtain wall. The frame structure used to support the glass is often the weak link of the glass curtain wall. If the initial design of the frame system is unreasonable, the frame structure can not bear the gravity in the building, and then deformation will occur, eventually leading to glass breakage

the solution is to carry out 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, so as to prevent the long-term overload operation of the frame

failure of fastener fixing device of glass curtain wall

all glass curtain walls rely on the fastener fixing device to combine the curtain wall and fix it on the building. However, unforeseen defects of the fastener fixing device may cause serious structural problems, and even cause the curtain wall glass to fall

the solution is to conduct necessary inspection on the fastening before installing the glass curtain wall, and only after passing the inspection can it be installed and used on site. In addition, in view of the falling of the floor type frame glass composed of two guide columns, two ball screws, upper crossbeam, middle crossbeam and workbench caused by the loosening of the fixing bolts, we use special lock nuts to lock the bolts in the actual construction process to prevent the bolts from sliding and failure, or use specific washers to ensure that the bolts will not fall off after fastening

other problems caused by glass curtain wall

glass curtain wall causes more than the above problems. Due to the large-area use of glass curtain wall, light pollution, color pollution, heat pollution and so on are all problems that can not be ignored. Although there are some problems in glass curtain wall, as long as designers, producers and users fully understand it and develop its strengths and circumvent its weaknesses, glass curtain wall is still a highlight of modern architecture

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