A brief discussion on the design and height selection of highway noise barriers

　　Planning and Design of Highway Noise Barriers

　　(1) Selection of Materials and Structure of Highway Noise Barriers

　　Considering its own sound insulation function, the sound insulation capacity of the sound insulation screen is generally 10db greater than the required sound level attenuation of the "sound shadow area", so as to prevent the sound insulation screen from affecting the sound propagation, and at the same time, to prevent water leakage from the holes on the sound insulation screen, and pay attention to the sealing of the structure.

　　(2) Highway noise barrier planning should pay attention to structural rigidity

　　Reinforce with steel bars on one or both sides of the bottom of the sound insulation screen. As for the movable sound insulation screen, a universal wheel can be added to the bottom side to adjust its position relative to the noise source at any time to achieve a better noise reduction effect.

　　(3) The sound insulation screen should have a satisfactory height and length

　　The higher the sound insulation screen, the greater the noise attenuation, so the sound insulation screen has a satisfactory height and length, generally requiring the length to be 3-5 times the height.

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　　How to choose the height of highway noise barriers?

　　The installation height of highway noise barriers should be selected according to the situation of different road sections:

　　1. Residential areas on both sides of the highway: Ordinary 3-meter devices can be installed for noise barriers passing through residential areas. Because the highways passing through residential areas are relatively far from residential areas, and the sound insulation effect of windows and doors in urban residential areas is also good, the height of the device will not be too high.

　　2. Villages on both sides of the highway: When the highway passes through villages, it depends on the interval between the highway and the village. If there are residential buildings parallel to the highway, the height of the noise barrier should be appropriately increased, and then the top is designed to be inwardly curved, which can greatly reduce the impact of noise on the surrounding villages. The height of ordinary equipment is 3m-4m.

　　3. Factories on both sides of the road that need to be shielded: If there are polluting places such as chemical plants on both sides of the road, the height of the noise barrier should not exceed 3.5 meters. This height can completely block the passengers' sight. If there is a center of pollutant diffusion, the height of the noise barrier will increase, generally around 4 meters. The highway noise barrier can prevent bad particles from entering the highway, thus affecting drivers.

　　Structural Composition of Highway Noise Barriers

　　The road ecological sound insulation barrier includes a road guardrail. A reinforcing member is fixedly set in the front middle part of the road guardrail. A reflective strip is bonded to the front middle part of the reinforcing member. Multiple fixing bars are inserted above the road guardrail. A sound insulation barrier is inserted between the fixing bars. Installation grooves are provided in the middle of the left and right sides of the fixing bars. Multiple first installation holes are provided on the fixing bars, and multiple second installation holes are provided on the sound insulation barrier.

　　The road sound insulation barrier is equipped with octagonal reinforcing ribs, reflective strips, and shock-absorbing springs. Because the octagon has a good stable structure, when a vehicle collides with the road guardrail, the reinforcing member and shock-absorbing spring can cooperate to achieve a good buffering and collision prevention effect. The reflective strip can also give the driver a good warning effect during night driving, improving safety performance.

　　The road sound insulation barrier has the characteristics of wide material sources and low cost; at the same time, it complies with acoustic design standards, meets the requirements of highway noise barriers, has low maintenance costs, and has a long service life.

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