| 摘要 |
<p>A noise protection wall has a rigid structure and the top edge facing the source of noise is covered with a noise absorbing or insulating material. The cover (1) of the wall extends above one of the top edges (3) of the wall structure (2). The cover also projects sideways and downwards to a distance below the top edges. The insulating or absorbing material can consist of a fertile substance, such as humus, dirt, mineral wool, etc.</p> |
