Recently, the epidemic has spread rapidly, people are panicked, and many people stay at home and rarely go out. Originally, the home retreat should be foolproof, but I did not expect that recently there was no going out, no contact, and the neighbors living on the patient's upper floor were infected, which really attracted the attention of netizens across the country.
The webmaster thought of the case of a large number of infections caused by building design problems in Amoy Garden in Hong Kong during the SARS virus epidemic, which is very worth thinking about.
< h1 class = "pgc-h-arrow-right" > the patient was infected</h1>
At 10:05 on February 2, the Inner Mongolia Health Commission reported a report on the pneumonia epidemic situation of the new coronavirus infection in the Inner Mongolia Autonomous Region from 10:00 on February 1 to 10:00 on February 2.
The confirmed case of Dalat Banner Bai of Ordos City, living on the upper floor of the confirmed case Song Mou, Bai has no history of contact with wild animals, no history of going out, and has not been in contact with fever patients. During the epidemic period, Bai went up and down the stairs many times through Song's house on the third floor, but did not enter Song's room or communicate with him. The door of Song's house is often open, and there is often domestic garbage piled up at the door.
On February 1, after expert consultation, it was determined that Bai was a confirmed case of pneumonia infected by the new coronavirus.
This is strange, Bai and the confirmed neighbor Song did not have close contact, how was infected with the virus? In fact, it may also be infected through kitchen smoke extraction channels, sewers or stair handrails. This was the case with the Tao Tai Garden SARS incident, which previously shocked all of Hong Kong.
<h1 class="pgc-h-arrow-right" > hidden crisis in architectural design</h1>
Built in 1981, Amoy Garden Hong Kong has 4,896 residences with a total of more than 20,000 residents. Before the SARS pandemic, it was just an ordinary residential complex in Hong Kong. However, during the SARS epidemic, this community suddenly became a hard-hit area of public attention.
During the SARS epidemic in 2003, a total of 1,755 people were confirmed in Hong Kong and 300 people died. In a small area of Taoda Garden, 321 people were infected and 42 people died. Among them, a large number of infected people are concentrated in Block E of the community, accounting for 41% of the total number of cases in the community. Building E is 33 storeys high and has 8 rooms on each floor, while the unit numbers for the most infection cases are rooms 8 and 7. These two types of apartments are among the hardest hit areas of infection.
After the investigation, it was learned that more than 90% of these infected residents did not have direct contact with the infected, and most of them belonged to the type of "home-based infection", which is a typical group infection caused by the design of the community building.
The source of the SARS virus transmission incident in the community is a 33-year-old man, Zeng Mou. On March 19, 2003, Zeng visited his brother in Tower E of Amoy Garden in Hong Kong. At his brother's house, he used the bathroom for diarrhea and flushed a large amount of virus-carrying feces into the toilet. The SARS virus flows down the water into the building's sewer pipes, most of which are discharged into the urban pipe network, but still a small part is attached to the inner wall of the sewage pipe.
Later studies found that the SARS virus can survive for 6 hours in the feces of ordinary normal people (pH 7), while in the excrement of SARS patients with diarrhea symptoms (pH 8-9) can survive for up to 4 days. This allows the sewers of Block E to maintain a high concentration of SARS virus gas for many days, providing a material basis for rapid and wide-ranging diffusion.
Each building in Amoy Garden has 8 vertical sewer pipes to collect sewage from rooms on all floors. This sewer connects to the toilet, wash basin, bathtub and bathroom drain. Sanitary installations are equipped with U-shaped water concentrators to prevent the odor of sewage pipes and insects from entering the toilet.
Under normal circumstances, the toilet floor drain and sewage pipe should be separated by a U-shaped sink, but because the toilet, wash basin, bathtub is commonly used, most residents clean the bathroom floor, accustomed to using a mop to mop the floor instead of using a lot of water to rinse the floor drain, which is easy to lead to the U-shaped water concentrator connected to the ground drain because of insufficient water, can not play a good role in air insulation.
Let's look at the case of Amoy Garden. During the SARS epidemic, scientists at the University of Hong Kong conducted an experiment in a unit in Block E of Amoy Garden. When the exhaust fan in the bathroom is turned on, the air pressure in the bathroom is negative, and the air in the sewage pipe can be sucked into the bathroom through the floor drain. If the air in the sewer contains a virus, it will spread through this route into the bathroom.
The first case of Amoy Garden appeared on the 16th floor, while the floors of units 7 and 8 were concentrated on the 13th and 24th floors, which shows that the virus has an upward channel. This has also been supplemented by the World Health Organization's subsequent investigative report. The report notes that when the bathroom exhaust fan is turned on, viruses drawn from the sewer pipes may be brought to the patio, allowing contaminated air to enter the household through the open windows.
What's worse is that there is a large crack in the exhaust pipe of the sewage channel near the 4th floor of Block E. Whenever the toilet is flushed, the cracked sewer drain discharges virus-carrying droplets into the patio.
In this way, the SARS virus of a diarrhea patient passed through the layers of exchange between toilets, sewers, floor drains, ventilation fans and patios, and eventually infected other households. These factors are put together, and Zeng mou has become a rare "super spreader" in a short period of time.
In summary, the large number of non-contact infected cases produced by Amoy Garden is generally caused by unreasonable architectural design, such as floor drains are prone to water shortage, patio air is not easy to circulate, drainage pipes are broken, high-rise buildings are too dense, high population density and other factors, layer by layer, and ultimately cause tragic consequences.
For the mainland, although the unit type of Amoy Garden in Hong Kong is relatively rare, the problem of patio ventilation with similar problems still exists. Especially in high-rise buildings, we must strictly guard against viruses that may float in the pipeline.
So how do we tell if there is a problem with our own exhaust system? For example, if you often smell the stir-fry from your neighbor's house, you need to be vigilant. The chimney effect of the air in the patio causes the air to flow upwards instead of outward, causing a situation where a polluted family spreads throughout the building. Therefore, properties and owners must strengthen their awareness of prevention and respond to various emergency situations.
In particular, recent studies have shown that the novel coronavirus can be transmitted through feces, and the survival time in the feces is longer than that attached to the surface of the article.
Therefore, we must always wash our hands with daily necessities with strong cleaning ability, such as soap, soap, and hand sanitizer, and then flush the toilet after using the toilet. Wash basins, bathtubs, wash basins, toilets, which are easy to breed bacteria, it is best to clean and disinfect frequently. You can mix disinfectant water with cold water at 1:49 and pour it into all the sinks in your home every morning and evening (remember to include floor drains) to ensure that the U-shaped sink has water and isolate the virus.
<h1 class="pgc-h-arrow-right" > home purchase suggestions</h1>
After similar incidents, for home buyers, they must pay more attention to safety when choosing. When buying a house, it is suitable to choose a house with a transparent pattern, good lighting, low density and low floors, so that you can avoid the situation that "the home is also infected" from the source.
If the building group is developed too densely, the spacing between the buildings is too small, which will affect the lighting of each room. In particular, households with bad orientation may find it difficult to see the sun all day long. Residents with elderly, sick or small children will undoubtedly have a weakened resistance due to the lack of sunlight for many days, and they are naturally more susceptible to infection when infectious diseases come.
For example, the tower was criticized when the SARS virus spread. Because the tower is easy to cause a part of the room, even the whole set of houses facing the north, the west, even if the south, east of the room, it is difficult to form a transparent pattern, natural lighting and air circulation can not be achieved. Without the sunlight and the flow of air, germs are easy to breed, dirty air cannot be effectively dispersed, and the health of residents is threatened.
Sunlight is indispensable for human survival, it brings light and heat to life, among which ultraviolet rays have a strong sterilization and disinfection effect, and sunlight and air circulation are good means to block the source of infection.
About two-thirds of our lives are spent indoors, and the quality of the indoor environment directly affects our health. Tests have shown that in the morning, open the doors and windows, in the low wind speed conditions, if there is a "through the hall wind", after 2-8 minutes, the indoor air can meet the sanitary standards. If there is no such convection, it will take at least 40 minutes.
The epidemic is an education class for all. In particular, the quality of property services can be fully experienced in these days, and people have an epiphany. In the past, many people paid more attention to the location and price, in fact, safety is also very important.
Although the epidemic continues, there is no accurate answer to when the inflection point will come, but with the arrival of spring, it is believed that the cold and night will eventually pass. With the near improvement of examinations, testing methods, and treatment methods, we will certainly have the ability, strength, and determination to win this virus battle.