Three types of noise barriers
Banedanmark operates with three different screen types, all of which are generally described in the "Construction manual for Banedanmark's standard screens".
Common to the screens is that they are primarily made of a galvanised steel construction built with load-bearing vertical columns, between which horizontal screen surfaces are mounted. Material thickness and profile dimensions on the individual steel parts depend on the actual loads from wind pressure, suction/pressure from trains and possibly foundation pressure.
If the screen is installed in terrain, the lower part of the screen is dug into the ground to ensure that it is completely soundproof. If the screen is installed on a construction (steel plugs, concrete wall, etc.), the intention is to make a soundproof connection to this construction. A Banedanmark screen usually has a height of 2 m from the top of the rails to the screen top. This ensures a clear view across the screen for the train's passengers.
Curved reflective screen
The most commonly used screen is curved, and exactly this curved design ensures that a significant part of the noise reflects back to the track, where it is intercepted in the roadstones. The screen surface itself consists of galvanised steel plates bent up as "hat profiles" and bolted together into one dense surface. At the top of the screen finish with a top fender. The column distance for this screen type is usually 5 m.
Vertical absorbent screen
Where the curved reflective screen cannot be placed, for example, due to reduced distance to the rail body or due to the location along the platform edge, a vertical screen with absorbent properties is used instead. The screen is constructed with folded screen plates made of galvanized steel, just as the curved. An insulating material is placed inside the "hat profiles", which is subsequently protected with a net of expanding metal. The column distance for this screen type is usually 5 m.
Vertical glass screen
If there are special visual conditions to take into account, transparent screens can be placed, where the upper screen plates are replaced by glass modules. The column distance for this screen type is usually 2.5 m.