发布日期:2022-05-07 Number of views:9
The higher the floor, the greater the noise pollution
The Hilton Shimao Binjiang Hotel in Nanjing and several houses in Shimao Binjiang New Town are "neighbors", about 60 meters apart. According to the legal department of Xianguan District Environmental Protection Bureau, since the beginning of the year, the environmental protection department has received complaints from residents of Shimao Binjiang New Town, reflecting that the noise of the "neighbors" is particularly loud, making their lives very "restless".
Environmental law enforcement officers went to the field investigation and found that there were too many machines and equipment on the top floor of the hotel, including lampblack treatment equipment, cooling tower, central air conditioning outdoor unit and so on, and it was impossible to determine the source of noise. In particular, the hotel is less than half the height of a residential building, and the owner who complained about the noise lived on the 32nd floor. In contrast, property owners on floors "level" with the hotel, as well as residents below and above, did not report loud noise. Monitoring personnel, generally speaking, the noise is to run upstairs, after many monitoring, they locked two lampblack treatment equipment is the noise source, the actual measured noise is more than 90 decibels, is seriously excessive. They describe how "two people standing close to the device can't make out what the other is saying."
Xiaguan District environmental law enforcement personnel introduced that before the construction, because the hotel is much lower than the residential building, so the engineering side thought that the lampblack treatment unit on the roof, noise pollution will not be generated, but the actual effect is not the same. The monitors took the instruments to the homes of the lower floors, and then to the homes of the higher floors. The results found that after removing the sources of noise such as traffic noise and social noise, the 32nd floor was indeed the most exposed to noise pollution.
High level noise is no shelter
Now there are more and more buildings adjacent to the hotel, and all kinds of machinery and equipment of the hotel are basically located on the podium or roof. Many urban buildings have small distance, high population density, and there is no standard to regulate how far outdoor equipment should be "away", so there are more and more complaints about noise pollution. In addition, the air pressure affects the way sound travels during the day and at night. So, how should the citizen choose the floor when buying a house?
Environmental experts say it depends on what kind of noise the housing is facing. For example, in a 20-story building surrounded by roads in all directions, the higher up the building, the noisier it will be, he said. Because the higher the floor, the more noise sources can be exposed to, for example, if you live on the 15th or 20th floor, even the noise from the road several kilometers away will be received. In addition, if the noise source around the building is only a road ahead, then the middle floor will be particularly noisy, because the trees or sound insulation screen on both sides of the road will help the lower floor to block part of the noise, but the upper floor will be relatively less affected due to the distance from the noise source, and the residents living on the 6-15 floor are not so lucky. It is easier for noise to enter the house directly.
However, if the source of the noise is the machine peripheral on the top floor, the situation is more special. "For example, the top floor of the hotel is surrounded by walls, and the noise of the machine peripheral is wrapped up. The noise received by the residents at the same height is less, but the noise increased the further up the stairs," the expert said.
According to the introduction, the form of noise pollution in the upper and lower floors is not the same. For the lower layer, its noise source is represented by vibration and sound. For high-rise households, the impact of vibration will be reduced, but the sound is transmitted in the form of sound waves, when the height of a certain floor is exactly an integer multiple of the wavelength of the noise sound waves, the noise will be very obvious. This is because there are no buildings around the high-rise, high-rise is completely exposed to the three-dimensional transmission of sound waves, so the noise is large. And because noise begins to decay at a certain height, households on higher floors are less affected.
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