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Traffic noise has become a prominent environmental problem affecting people's daily lives and harming their health. Statistics show that nearly 40% of urban residents live in environments with excessive noise levels.
Sichuan Sanyuan Environmental Management Co., Ltd. has been deeply involved in the field of noise control and has explored a comprehensive management model of " sound barrier + soundproof window ", which has effectively solved the problem of noise pollution from highways.
01 High-speed traffic noise: an invisible environmental killer
With the rapid development of my country's economy, the construction of high-level transportation infrastructure such as highways and high-speed railways has been advancing rapidly, and more and more people are living along busy roads. Traffic noise pollution has become a prominent environmental problem in the 21st century.
Noise pollution not only affects residents' quality of life but also causes substantial harm to their health. Studies have shown that long-term exposure to high-noise environments can lead to a range of problems, including sleep disorders, cardiovascular disease, and decreased learning and work efficiency.
02 Sound Barrier Technology: The First Line of Defense for Outdoor Noise Reduction
A sound barrier is a solid barrier placed between a sound source and a receiving point, which can significantly attenuate the propagation of sound waves. Its noise reduction principle mainly relies on the formation of a "sound shadow zone" to block direct sound, isolate transmitted sound, and attenuate reflected sound.
This technology is effective at blocking high-frequency sound (large sound shadow zone, short wavelength), but less effective at blocking low-frequency sound below 250Hz (easily diffracted). Structurally, it is usually made of brick or concrete and consists of steel structural columns and sound-absorbing and insulating panels: the columns are fixed to the foundation as load-bearing components, and the panels are fixed in the column slots by spring clips.
Common sound barriers are 1-5 meters high and can achieve an average noise reduction effect of 10-15 dB(A), with a maximum of 20 dB(A).
03 Soundproof window technology: The ultimate guarantee of indoor quietness
Soundproof windows are another important technology for controlling noise on highways, and are particularly suitable for situations where sound barriers are insufficient in noise reduction.
Technical principle : The ventilation and soundproof window launched by Sanyuan Environment consists of a system soundproof window and a soundproof and purifying ventilator, which has three major functions: blocking outdoor noise, active noise reduction, and indoor ventilation and purification.
The soundproof window system employs a multi-cavity thermal break structure, with high-density polyurethane sound-absorbing material filling the frame. The window frame corners are sealed using an injection molding method, creating a closed cavity around the frame. The glass is damped soundproof glass, firmly bonded to the sound insulation film under vacuum, high temperature, and high pressure.
Ventilation Design : The soundproof and air-purifying ventilator mainly consists of an air intake filtration system, a noise-reducing duct, and an active noise reduction control system. The filtration system is equipped with a purification fan and multi-layer composite filters, which effectively filter outdoor PM2.5 and other particulate pollutants while achieving indoor ventilation.
Active noise reduction : The active noise reduction control system is installed inside the noise reduction duct to actively reduce the low-frequency (50Hz-300Hz) line spectrum noise emitted by the filtration system's purification fan. This is achieved by actively reducing the low-frequency line spectrum noise emitted by the purification fan through the principle of sound wave interference cancellation.
04 Comprehensive Application Case: Successful Practice of Chengdu-Wenjiang-Qionglai Expressway
Xinyuan Jincheng Garden residential community in Wenjiang District, Chengdu, is located south of the Chengdu-Wenjiang-Qionglai Expressway, only about 40 meters from the expressway. Traffic noise has severely affected the normal rest of the residents, leading to numerous complaints.
The Chengdu-Wenjiang-Qionglai Expressway Company first installed a 4-meter-high sound barrier in this section of the community . After the sound barrier was built, the noise was reduced to some extent for residents on the first and second floors, but the noise reduction effect on residents on the upper floors was weak, and there were still many complaints from residents.
Subsequently, the project adopted preventative measures at noise-sensitive points, installing soundproof and ventilated windows in the homes of each household. This not only isolates external noise but also ensures fresh air circulation indoors.
The noise level control has yielded significant results: Before installation, the maximum daytime noise level on the side of the residential area facing the highway was 72 dB(A) with the windows open , and 54 dB(A) with the windows closed. This exceeded the indoor noise standard by 9 dB(A) during the day and 17 dB(A) at night.
After removing the original windows and installing ventilated and soundproof windows, the indoor noise level dropped to 35 dB(A) when the windows were closed, and the maximum sound insulation reached 37 dB(A). This fully meets the indoor noise limit standards for residential buildings in the "Code for Sound Insulation Design of Civil Buildings" (GB 50118-2010), and also complies with the "Code for Design of Residential Projects" (GB 55038-2025), which stipulates that the sum of the weighted sound insulation and the traffic noise spectrum correction (CRw+Ctr) of the exterior doors and windows of bedrooms facing the main traffic artery in residential buildings along the street should not be less than 35 dB.
05 Technological Advantages: The Value of Integrated Solutions
The integrated treatment model of "sound barrier + soundproof window" of Sanyuan Environment has the following significant advantages:
High-efficiency sound insulation : The weighted sound insulation of the ventilated soundproof window can reach 30-40dB , which is far higher than the sound insulation performance of traditional windows. It has a good noise reduction effect on low, medium and high frequency outdoor noise.
Ventilation and purification : The maximum indoor fresh air volume can reach 120 m³/h, exceeding the air exchange rate specified in the "Indoor Air Quality Standard" (GB/T18883-2002). PM2.5 particulate matter purification efficiency > 95% , effectively removing outdoor pollutants.
Energy-saving and environmentally friendly : The product has excellent heat preservation and insulation performance, which can significantly reduce air conditioning energy consumption compared with traditional window ventilation.
Safe and comfortable : Utilizing thermally broken aluminum profiles and a multi-cavity structure design, it achieves a wind pressure resistance rating of level 9.2. While ensuring sound insulation, it provides a healthy indoor environment and a comfortable living experience.
This comprehensive governance model has significantly improved residents' quality of life and health, effectively reduced noise pollution, and provided clean indoor air. At the same time, it promotes community harmony and green development, possessing significant social value and environmental significance.