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In daily life, traffic noise has become a prominent environmental problem that affects people's normal lives and harms human health. According to statistics, nearly 40% of urban residents live in an environment with excessive noise.
Sichuan Sanyuan Environmental Governance Co., Ltd. has been deeply engaged 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 nuisance on 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 expressways and high-speed railways has been rapidly advancing. As a result, more and more people are living near busy roads. Traffic noise has become a prominent environmental issue 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 levels 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 dense barrier placed between a sound source and a receiving point, significantly attenuating the propagation of sound waves. Its noise reduction principle relies on creating an "acoustic shadow zone" to block direct sound, isolate transmitted sound, and attenuate reflected sound.
This technology is effective at blocking high-frequency sounds (large acoustic shadows and short wavelengths), but is less effective at blocking low-frequency sounds below 250Hz (which are easily diffracted). The structure is typically made of brick or concrete, consisting of steel columns and sound-absorbing and sound-isolating panels. The columns serve as load-bearing components fixed to the foundation, while the panels are secured to the column slots using spring clips.
The common height of sound barriers is 1-5 meters, which can achieve an average noise reduction effect of 10-15dB(A), and a maximum of 20dB(A).
03 Soundproof window technology: the ultimate guarantee of indoor quietness
Soundproof windows are another important technology for highway noise control, and are particularly suitable for situations where sound barriers are insufficient to reduce noise.
Technical principle : The ventilation soundproof windows launched by Sanyuan Environment are composed of system soundproof windows and soundproof purification ventilators, which have three functions: isolating outdoor noise, active noise reduction, and indoor ventilation and purification.
The system's soundproof windows utilize a multi-cavity thermally insulated structure, with the profile filled with high-density polyurethane sound-absorbing material. Glue is injected into the window frame corners, creating a sealed cavity around the frame. The glass utilizes damped soundproof glass, made by bonding soundproof film securely under vacuum, high temperature, and high pressure.
Ventilation Design : The soundproof and purifying ventilator primarily consists of an air inlet filtration system, noise reduction ducts, and an active noise reduction control system. The filtration system features a purification fan and multi-layer composite filter, effectively filtering out particulate pollutants such as PM2.5 while providing indoor ventilation.
Active noise reduction : The active noise reduction control system is installed in the noise reduction air duct and actively reduces the low-frequency (50Hz-300Hz) line spectrum noise emitted by the filtration system's purification fans. This is achieved by using the principle of acoustic interference and destructive noise.
04 Comprehensive Application Case: Successful Practice of Chengwenqiong Expressway
Xinyuan Jincheng Garden Community in Chengdu's Wenjiang District is located south of the Chengwenqiong Expressway, just 40 meters from the highway. Traffic noise has severely disrupted residents' rest and has drawn numerous complaints.
The Chengwenqiong Expressway Company initially installed a 4-meter-high sound barrier in the section of the residential area . While the barrier helped mitigate noise levels for residents on the first and second floors, it had little effect on higher-rise residents, leading to numerous complaints.
Subsequently, the project implemented preventive measures at noise-sensitive areas, installing ventilation and soundproof windows in every household. This not only blocked out external noise but also ensured fresh air flow indoors.
The treatment effect is significant: Before the installation, the maximum outdoor noise level on the highway side of the residential complex was 72dB(A) during the day with windows open, compared to 54dB(A) with windows closed. The noise level exceeded the indoor noise standard by 9dB(A) during the day and 17dB(A) at night.
After removing the original windows and installing ventilated soundproof windows, the noise level inside the house dropped to 35dB(A) with the windows closed , and the maximum sound insulation reached 37dB(A). This fully meets the residential indoor noise limit standards of the "Code for Sound Insulation Design of Civil Buildings" (GB 50118-2010), and complies with the "Residential Project Specification" (GB 55038-2025), which stipulates that the sum of the weighted sound insulation and traffic noise spectrum correction (CRw + Ctr) for exterior doors and windows of bedrooms on the side of street-facing residential buildings facing traffic arteries should not be less than 35dB.
05 Technological Advantages: The Value of Comprehensive Solutions
Sanyuan Environmental's comprehensive management model of "sound barrier + soundproof window" has the following significant advantages:
Highly effective sound insulation : The weighted sound insulation of ventilation soundproof windows can reach 30-40dB , far exceeding the sound insulation performance of traditional windows. They have a good noise reduction effect on low, medium and high frequency outdoor noise.
Ventilation and purification : The maximum indoor fresh air volume can reach 120m³/h, exceeding the air changes specified in the Indoor Air Quality Standard (GB/T18883-2002). PM2.5 particulate matter purification efficiency exceeds 95% , effectively removing outdoor pollutants.
Energy saving and environmental protection : The product has excellent thermal insulation and heat preservation properties, and can significantly reduce air conditioning energy consumption compared to traditional window ventilation.
Safe and comfortable : It adopts thermal break aluminum profile + multi-cavity structure design, and its wind pressure resistance reaches level 9.2. While ensuring the sound insulation effect, it provides a healthy indoor environment and a comfortable living experience.
This comprehensive governance model significantly improves residents' quality of life and health, effectively reduces noise hazards, and provides clean indoor air. It also promotes community harmony and green development, possessing both significant social and environmental value.