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Between the source and receiver inserts a facilities, make the sound waves spread has a significant additional damping, so as to abate the noise in the receiver in a certain area, such facilities are called noise barrier.
Sound waves in the process of transmission, sound barriers encountered, reflection, transmission and diffraction occurs three phenomenon. Sound barriers according to the type of sound insulation, sound absorption and can be divided into the two hybrid, sound absorption and sound insulation is mixed currently used. According to the form and noise barrier can be divided into two kinds of basic, curved and straight flat form, each form and can be divided into many kinds of structure forms. Sound barrier height is 2000 mm, 2500 mm and 3000 mm three standard, column spacing is 1000 mm and 2000 mm, 2500 mm standard. According to the material classification and noise barrier can be divided into the following categories: metal sound barriers (metal shutter), metal mesh hole, concrete noise barrier (lightweight concrete, high strength concrete), PC sound barriers, FRP acoustic barrier, etc.
Noise barrier is mainly composed of steel columns and acoustic screen plate in two parts, absorption column is the main stress components of noise barrier, it is fixed by bolts or welding at the edge of the road against a wall or rail on the embedded steel plate; r:line-break'>