BS/EN 16951-1-2018 pdf download.Railway applications – Track – Noise barriers and related devices acting on airborne sound propagation- Procedures for assessing long term performance Part 1: Acoustic characteristics.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
EN 60721-3-4, Classification of environmental conditions – Part 3: Classification of groups of environmental parameters and their seventies – Section 4: Stationaiy use at non-weatherprotected locations flEC 60721-3-4)
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
noise barrier
noise reducing device, which obstructs the direct transmission of airborne sound emanating from railways, and which will typically span between posts and also may overhang the railway
Note 1 to entry: Noise barriers are generally made of acoustic and structural elements (see 3.3 and 3.4).
3.2
cladding
noise reducing device, which is attached to a wall or other structure and reduces the amount of sound reflected
3.4
structural element
element whose primary function is to support or hold in place acoustic elements
Note Ito entry: In some noise barriers, the acoustic function and the structural function cannot be clearly separated and attributed to different components
3.5
added device
added component that influences the acoustic performance of the original noise-reducing device (acting primarily on the diffracted energy)
Note ito entry: In some noise barriers, the acoustic function and the structural function cannot be clearly separated and attributed to different components.
3.6
line side exposure
use of the product as a noise barrier installed alongside railways
3.7
acoustic working life
period of time during which the declared acoustic performance(s) [DL (from EN 16272-3-1) and/or DL4t (from EN 16272-3-1) and/or DLRI (from EN 16272-3-2) and/or DL51 (from EN 16272-3-2)1 of the device will be maintained
4 Requirements
Standard environmental categories selected for rail noise barriers and related devices acting on sound propagation with possible variations are given in Annex A of this document.
The manufacturer shall provide the relevant acoustic performance characteristic (DL and/or DLR and/or DLRI and/or DL51) at the end of the working lifetime of the product and define the corresponding working life under the exposure classes, listed in the Table 1, adapted to the intended use of the noise barrier or related device acting on sound propagation. Where material standards exist, durability shall be assessed using them (see Annex B).
Adverse effects on long-term performance of contact with the ground shall be taken into account.
If retention of water Is likely to degrade the working life, the design shall ensure that water is not retained.
The working life of structural and acoustic elements may be different; therefore they shall be assessed under the same exposure conditions when installed on the same site.
If a change in humidity and/or temperature and/or UV affects the dimensional stability of materials used in the construction, then the design shall allow for such changes and ensure that the performance continues to fulfil the performance characteristics.
Where different materials are used in the construction, all appropriate measures shall be taken to avoid electrolytic and chemical corrosion or interaction that could adversely affect working life.
NOTE This European Standard enables specif’Ing authorities to indicate where there Is no requirement for assessment under any particular exposure classes.
5 Report
The report shall include a full description of the geometry of the product evaluated, including details of procedures required by all appropriate material documents.
It shall also Include:
a) reference to this standard;
b) name and address of the approved independent evaluating body with a dated signature of the
person responsible;
c) exact identification of evaluated product, name and address of the manufacturer;
d) full description of the materials, their thicknesses and densities of sound absorptive elements;
e) drawing showing the cross-section of the evaluated element with permitted manufacturing tolerances;
1) the list of measures taken to limit the effects of ageing on product;
g) the table of declared working lives;
h) installation and maintenance manuals for the achieving of the declared working life.BS/EN 16951-1-2018 pdf download.