| 摘要 |
Noise barrier element, comprising a first sheet-metal wall (1), which is placed on the side facing toward the noise source and provided with perforations (2), a second sheet-metal wall (3), which is a solid and continuous wall parallel to the first wall (1) and placed at a distance (L) from it so that there is an interior space (4) between the first and second walls, and a piece of noise damping board (5) made of sound absorbing material and disposed in the interior space (4). The noise damping board (5) is glued to the second sheet-metal wall (3). <IMAGE> |
