| 摘要 |
<p>u The element has a rectangular noise control element for the separation of a quiescent range from a noise-loaded range and two noise control layers (1, 3, and 4). An insulating layer (1) containing cement material has a density of over 1000 kgm3 and parallel to it is an arranged absorber layer (3, 4). The insulating layer has a cement containing a GRP components plate (2a, 2b), with a 40 mm thick absorber layer (3) made from an open-porous material with a density of 200 kgm3. The insulating layer is arranged between two parallel, firmly connected cover plates (6). The cement material GRP components plates are 4 - 10 mm thick.</p> |
