1
This time, we will mainly talk about the shaking of the Sage Building in Shenzhen. This thing looks simple, but behind the scenes can be found a lot of problems, related to many people.
At about 13:50 on May 18, Shenzhen City Futian District Huaqiang North Street Saige building shaking, many people have escaped from the building, the shock. A number of live video shows, the Saige building shaking, suspected that the top of the lightning rod in the left and right shaking. A large number of people flocked to evacuate from the building, and some people pulled trailers with goods to evacuate the building. The scene is very chaotic, many people’s first feeling is that an earthquake occurred in Shenzhen.
Outside the building on the street, many people are also using cell phones to shoot the building constantly shaking substantially. For a while, many videos and texts about the shaking of the Sage Building went viral on social media at home and abroad. Netizens have left comments on Weibo, saying that the escape was like a “doomsday escape”. Some people said they threw off their flip-flops during the emergency escape. Others said that it took 16 minutes to run from the 50th floor to the 1st floor to escape.
Ms. Xu, who evacuated from Sage Tower, revealed that she worked on the 51st floor of Sage Tower, and at about 12:15 that day, a colleague said “there was shaking”, but other colleagues said it was not obvious. Until about 13:05, “the chair shaking more obvious, we all feel it”. So, she and colleagues rushed out, and found that many people outside also in the escape evacuation.
Normally, such a large amount of shaking, can make the people inside the building have such a big reaction, generally because of the earthquake. However, the Shenzhen Emergency Management Bureau said that there was no earthquake that day. So was it because the wind was too strong and blew the building to shake it up? Shenzhen Meteorological Bureau also said the wind was only 5 at the time of the incident, not called a gale. Therefore, the 71-story building is still unknown because of the sudden shaking.
At present, the building has been evacuated, the building has been closed, outsiders are also prohibited from entering, the entrances and exits (including the parking lot) have been guarded by security guards or property staff. It is reported that the Shenzhen Fire Department has received the police and police, public security departments have also been involved, the details of the situation and the cause to be identified.
Shenzhen Emergency Management Bureau announced that the Shenzhen Emergency Management Bureau, fire departments have rushed to the scene after the incident, the Shenzhen Municipal Housing Authority informed that the main structure of the building is safe, and said that experts have been organized to the scene investigation, research and analysis, the building at 1:30 after the vibration, the main structure of the building and the surrounding environment is not found to be abnormal. As for the specific cause of vibration is still under investigation.
Of course, some experts say it is a resonance phenomenon. It is estimated that the building shaking is very likely to be due to the natural frequency of the building and external forces coincide with the “resonance phenomenon”, external forces may refer to the wind speed or nearby engineering. At the same time, he also pointed out that more than 50-storey building is “super high”, the design will be installed to avoid earthquakes, will also envisage a number of scenarios of natural frequencies, so there should not be so much shaking.
Now there are more rumors that the building has too many “coin miners” concentrating on resonance. So, what exactly makes this building shake now is also a wide range of opinions.
According to public information, the Sage Building is a skyscraper located in Huaqiang North, Futian District, Shenzhen, and was built with direct investment from Shenzhen Sage Group Co. The building is 71 stories high, with a total height of 355.8 meters and a real height of 292 meters, with a construction area of 164,300 square meters, and is now the fifth tallest building in Shenzhen, and is also the world’s tallest steel pipe and concrete structure building.
If this building collapsed, half of Huaqiang North collapsed. Taobao, Poundland on the electronic and cell phone accessories are going out of stock, the supply chain of mining machines will also be hit.
2
This building’s substantial shaking, let me first think of the building quality is substandard, this shaking is a kind of prelude to the building problems. Especially when you think about the fact that many houses in Shenzhen are built with sea sand, this is even more of a hidden danger.
In fact, this is not the first time that Shenzhen’s building problems have caused national attention. Once can be said to be a coincidence, if it is multiple times, then there may be some kind of causal logical connection.
In August 2019, a 30-year-old residential building in Shenzhen’s Luohu District collapsed, causing no casualties because of early evacuation but making the national news rounds. It is reasonable to say that a normal accident in the country with a few deaths can not be on the hot search, why a building collapsed but did not cause casualties of the accident, can cause a national people’s hot topic. The only explanation behind this may be that people will associate their own house if it collapses at the end of its 30-year life how to deal with it.
Shenzhen these two house problems triggered a high degree of national concern, the main may still be these years everyone is smashing pots and pans to buy houses, the life savings pressed into the house, so the quality of any house will touch everyone’s nerves, so in the whole society will trigger a high degree of concern.
In addition to these two incidents in Shenzhen, and then before there is an incident, is the house in Wenzhou problems. October 2016, Wenzhou, Zhejiang Province, a six-story house collapsed, resulting in 22 people unfortunately killed, 6 people injured, self-built houses, age, poor quality, the foundation is not firm …… that incident can be said to be in that year detonated the Chinese The house quality problem of the big discussion. Now 3 years have passed, the Shenzhen house collapse incident, once again aroused the nation’s full attention to the quality of the house.
The house did not reach 70 years collapse, how to deal with the follow-up, the current Chinese law in this area is still a blank area, there has been no clear statement.
China’s commercial housing scale construction from the 1990s, so far, it has been almost 30 years, in recent years, all over China have been happening a lot of natural collapse of commercial housing phenomenon, is proof that the wave of poor quality commercial housing is going to the end of life, and the collapse of the house, not only related to the loss of the owner’s property, but also related to the personal safety of the occupants, it can be said that human life is at stake ah.
No relevant construction standards were introduced 30 years ago, and excessive chloride ions in sea sand will seriously corrode steel reinforcement
A recent statistic shows that the life span of our housing buildings is generally short, 35 years on average, especially in Beijing, where the average is less than 30 years, which is only half of the designed life span of 70 years.
We consume over 40% of the world’s cement and steel each year and it only lasts 25-30 years, a level of design and efficiency that really takes the breath away from Europe and the US. In contrast, the average life span of British houses reaches 132 years, and the average building life span of the United States reaches 74 years.
No contrast there is no harm, compare the houses in Europe and the United States, and then look at our house, feel a lifetime of hard work to save money, make money, is to rent a 30-year house.
More terrible is that the house not only to empty your money, 30 years later may be because of the collapse accident, but also your life, or the life of your tenants, just like the 22 unjust souls lost in the Wenzhou housing collapse. The homeowners of this house in Shenzhen are still considered lucky.
3
The current statistics of the average life expectancy of Chinese houses is about 30 years, then some people will ask, that most of the statistics of the 80’s commercial housing samples, is not the life expectancy of the houses built in these years will be extended? I do not think so, after all, the most critical thing to build a house is the solid material, construction of fine, design and construction technology on the quality of the house and the use of years, there is not much influence. We look at some ancient buildings in Europe and the United States, moving is 200-300 years, but now the construction of some houses, the use of shortened years, China is the same, the house in the 80s can still manage 30 years, perhaps the construction of the house in the past few years, even 20 years can not manage, it is possible.
Some people may not believe, we can look at the actual situation of Shenzhen Hai Sha built houses.
March 14, 2013, CCTV financial channel “first time” reported that a residential building in Shenzhen floor cracking, wall cracks and other problems, every rainy day seepage is not. And according to the investigation results of the municipal government, the root of the problem is the use of a large amount of sea sand during construction. The excessive chloride ions in the sea sand will seriously corrode the steel bars in the building and even collapse.
In accordance with the “Opinions on Strict Management of Sea Sand for Construction” opinion issued in September 2004, sea sand must be purified and meet the requirements before it can be used to prepare concrete. For reinforced concrete, the chloride ion content in sea sand should not be greater than 0.06%. If sea sand must be used, it should be rinsed by fresh water, and its chloride ion content should not be greater than 0.02%. If the construction of sea sand does not meet the national mandatory standards, the excessive chloride ion content will seriously corrode the reinforcing steel in the building, causing a major safety hazard.
There have been cases, like the Shenzhen Lutan Village, which was built 23 years ago and is almost rotting throughout. And in 2005-2011, Shenzhen has a number of residential projects have been exposed to the illegal use of sea sand to build houses, including Pengwan Liyuan, Shanquan District, East and Primary School, Haitao Garden and many other well-known communities included. And in 2013, by the China Resources Group is responsible for the construction of the old village of Dachong Village renovation project is the largest urban reform project in Guangdong Province, the project with the majority of sand is sea sand. Also exposed are, Shenzhen’s Ping An Financial Center, Shenzhen Metro project, these large projects, there are the case of building houses with sea sand.
In addition to Shenzhen, the situation of building houses with sea sand is common throughout the Pearl River Delta, for example, in December 2012, Foshan’s Expo Park, Lihai Tsimshatsui East Peninsula and Sunshine International Plaza and other four under-construction projects, was exposed to the alleged illegal use of excessive sea sand.
In the past a lot of use of river sand, over the years the river sand is less and less, transportation costs are also high, so now not only Shenzhen, the entire Pearl River Delta are common throughout the use of sea sand to mix concrete, at least half the cost savings. Because of the greed of unscrupulous businessmen, regulation is not in place, such a sea sand dangerous buildings in Shenzhen and even the Pearl River Delta abound. In another 20 years, Shenzhen may be all over the dangerous buildings, and many of the sea sand room in 7-10 years will be able to corrode the steel, so that the house is in danger of collapse.
Think about it, even Shenzhen, a so-called international metropolis with one of the highest housing prices in the country, is building houses with banned sea sand, that other coastal cities are not exposed to the phenomenon of sea sand covered houses, should be imaginable. The phenomenon of building houses with sea sand is definitely just the tip of the iceberg in the house building industry. Recently watched two videos about the quality of the house, one is a homeowner with a screwdriver, on the bottom of their newly purchased house dug through, found that there is very little steel inside, basically no; another video is a house split into two halves after cracking, half directly from the air fell down.
Many netizens said, this is what we will all continue, and then carry decades to pay off the debt bought the house, where is the house ah, completely is the cement box. Not only to money, but also life.
4
Here I want to tell you a message, a number of insurance companies in a few years ago launched a new insurance – residential quality insurance, but, so Beijing and Shanghai, they dare to accept the insurance of a few properties, and, all Chinese insurance companies residential quality insurance only cover the first 10 years, that is, the house is still relatively new 10 years, after 10 years they do not cover. After 10 years, they don’t cover it anymore. Why don’t they dare to provide insurance to homeowners within the reasonable life span of the design of the house, say 70 years? The quality of the home is a hard problem.
The fact that insurance companies have business and don’t do it shows that they have been actuarially calculated to recognize that there is no problem with the quality of the house within 10 years, and the probability of a major problem after 10 years will increase, which also shows the seriousness of the housing quality problem from the side.
Over the years, houses are indeed more and more beautiful, it can be said that the external quality of housing has greatly improved, but the invisible part of the buyers, that is, the inner quality of housing in the end how?
As the scale of housing construction is at a record high year after year, more and more civilian workers do not have enough training to become construction workers, but also because of the growing corruption, red packet kickbacks have penetrated into all levels of employees, jerry-building, substandard, barbaric construction has become almost the standard operation of the construction industry, in addition to the construction supervision mechanism is not perfect, virtually null and void, therefore, the construction industry has lost the falsification Monitoring and control.
There is also the fact that the national standards for residential construction have not been updated, and the technical standards of the steel and cement scarcity stage of decades ago are still being used, coupled with the low safety of the building structure design, some indicators are only half of the international standard, which is also a hard wound of the house quality problem.
These are the main reasons for the increasing number of housing collapse cases at present. So, when it comes to 70-year tenure houses, our actual tenure is only 30 years, or even shorter.
The life span of a house cannot be seen or touched, and until the house cracks, collapses, or one day disintegrates in the air, we do not know exactly how many years the life span of a house is. Once known, may often have to pay is the price of blood, or even life.
As commercial housing began to appear on a large scale in the 1990s, the default 30-year period of housing life is getting closer and closer, and the tide of house collapses will arrive. Here, I still hope that every family is safe. The fewer incidents like the one in Shenzhen where whole buildings collapsed and people fled for their lives as the whole building shook, the better.
Recent Comments