Porous concrete noise screen wall element - has surface cavities with variously stepped and sloping sections inside

摘要

For use esp. in walls alongside roads or railways, the noise-protective element is made of open-pored concrete, with depressions in the front side turned towards the noise source. Some depressions are in the form of holes (20) which are stepped in depth, with steps (22, 23) of different diameter. The holes can have sides (24, 25) sloping towards the front, pref. at different angles in different steps. Smaller holes (21) may be interspersed between them, pref. in single-step form.