| 摘要 |
Sound barrier in the open air along a without roofing provided road for car or train traffic, with a sound reflecting layer (1) and at the sound side of it a sound absorbing layer (2) and at the sound side of it a sound permeable layer (8) which allows passage of the from the source stemming sound substantially unhindered, which layer (8) is provided fold free and/or pre tensioned in the barrier, preferably overlaps with the to the main face of the barrier parallel side of the frame of the barrier, which barrier is designed to shield the living environment from the sound of vehicles at the road. |
