The explosion of the hottest glass curtain wall ca

In recent years, many cities across the country have experienced accidents in which glass curtain walls automatically burst and fall off. Some people call glass curtain walls "air killers in cities". Glass curtain walls, which once led the trend of China's construction industry, have once again become the focus of attention of all sectors of society

in December 2006, the former Ministry of Construction issued relevant regulations stating that its chemical name was polymethyl methacrylate (PMMA), which clearly required that glass curtain walls should generally be inspected once every 5 years, and in principle, safety appraisal should be conducted every 10 years. However, the author found in the interview and investigation that in some places, the glass curtain walls of many high-rise buildings are only cleaned once every half a year or every year, which is far from safety inspection, let alone safety appraisal. The danger "fell from the sky". According to the data, by the end of 2005, China's various glass curtain wall buildings had reached 150million square meters, accounting for more than 50% of the global total. It has become the world's leading country in the production and use of glass curtain walls, and the use of glass curtain walls is also concentrated in the buildings of "Beijing, Shanghai, Guangzhou and Shenzhen" and other big cities

with the growth of service life, the hidden dangers of glass curtain wall are gradually exposed, and the self explosion and falling off of glass curtain wall have become the hidden dangers of urban safety. The author learned that in just five months since March this year, safety incidents caused by the self explosion of glass curtain walls in Guangzhou have continued, causing a great impact on citizens

on March 1, on the second floor of a commercial square in Yuexiu District, Guangzhou, a 4-meter-long and 1.5-meter-wide window glass suddenly burst, and debris flew down. The old lady passing downstairs was scratched by debris and sent to the hospital for treatment; On March 9, a large glass fell from the 9th floor of a hotel in Huangpu District and hit a BMW downstairs; In April, in the home of a resident of a residential building in Zhujiang New Town, Tianhe District, a piece of tempered glass with an area of about 2 square meters exploded, with a hole of about 1 meter in diameter

the author learned that similar phenomena also occurred frequently throughout the country: from 2007 to 2009, the arc-shaped glass of 12 households in a community in Yubei District of Chongqing exploded, and the falling glass smashed six cars; On August 29, 2009, a bank building in Wuhan, Hubei Province suddenly began to rain with glass. The broken glass fell with the wind and lasted for more than 10 minutes. Two passers-by were injured and the sunroof of a car was smashed. It is reported that this was caused by a piece of tempered glass on the 41st floor of the building, which was blown down by strong winds after self explosion; On August 8, 2009, the glass curtain wall on the 25th floor of Wusi Road in Fuzhou, Fujian Province fell from the sky and hit the car in front of the building

"although the quality and strength of building glass are fully guaranteed at present, after all, the seismic resistance and deformation resistance of glass are insufficient. Once encountering typhoons, hurricanes, earthquakes, hail, sudden changes in temperature difference, etc., it may lead to safety incidents of simple and easy operation." Some professionals said

the warranty period has expired and has become a hidden "time bomb"

the author saw during his visit that at present, glass curtain walls are everywhere in all districts of Guangzhou. "In the industry, self explosion is a stubborn disease of tempered glass, which cannot be completely avoided by current technical means. Now the biggest problem is that most glass curtain wall buildings in Guangzhou have exceeded the 10-year project quality assurance period." Guangdong Academy of Building Sciences said. The stressed metal of the building curtain wall is bonded with the glass material, and the key material is silicone structural sealant (hereinafter referred to as "structural sealant"). Excluding other quality problems, this kind of glue cannot be permanently effective, and it may age in about 10 years. Based on this calculation, the service life of the glass curtain wall built since the 1980s, especially the hidden frame glass curtain wall built in the 1990s, has passed the 10-year warranty period, and there are great potential safety hazards. According to the requirement that the quality assurance period of curtain wall project is 10 years, the owner shall be responsible for the quality problems after 10 years

it is understood that the relevant specifications of the former Ministry of construction stipulated that the contractor should provide the owner with the curtain wall operation and maintenance manual. On December 5, 2006, the former Ministry of Construction issued the "management measures for the safety maintenance of existing building curtain walls", hereinafter referred to as the "measures", which stipulates that "the owner responsibility system shall be implemented for the safety maintenance of existing building curtain walls."

however, the author understands that the owners of glass curtain wall buildings have said that they have not received such instructions, and the contractor has not provided such instructions to the owners. At the same time, the owners also said that they simply did not know that they were responsible for the glass curtain wall, and as for the general shelf life, maintenance period, maintenance and other common sense is even more unclear

but for general manufacturers

under the internal economic cycle, in April 2021, China · when the dynamometer shows that it is close to the load to be tested, Chengdu Construction Expo will talk with you about new opportunities for the industry

in 2020, with the outbreak of the global epidemic and the prevention and control of the domestic epidemic being effectively controlled, the global economic situation has also undergone great changes, and China is moving forward under the strong strategic deployment of national policies [details]