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1、BRITISH STANDARD BS EN 1794-2:2003 Road traffic noise reducing devices Non-acoustic performance Part 2: General safety and environmental requirements The European Standard EN 1794-2:2003 has the status of a British Standard ICS 93.080.30 ? Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56
2、:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 1794-2:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 11 September 2003 BSI 11 September 2003 ISBN 0 580 41733 6 National foreword This British Standard is the official English langua
3、ge version of EN 1794-2:2003. It supersedes BS EN 1794-2:1998 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee B/509, Road equipment, to Subcommittee B/509/6, Fences for attenuation of noise, which has the responsibility to: A list of organizations rep
4、resented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence I
5、ndex”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself c
6、onfer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promu
7、lgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 23 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComm
8、ents Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1794-2 April 2003 ICS 93.080.30Supersedes EN 1794-2:1998 English version Road traffic noise reducing devices - Non-acoustic performance
9、 - Part 2: General safety and environmental requirements Dispositifs de rduction du bruit du trafic routier - Performances non acoustiques - Partie 2: Exigences gnrales pour la scurit et lenvironnement Lrmschutzeinrichtungen an straen - Nichtakustische Eigenschaften - Teil 2: Allgemeine Sicherheits
10、- und Umweltanforderungen This European Standard was approved by CEN on 2 January 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date list
11、s and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsi
12、bility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg,
13、 Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form a
14、nd by any means reserved worldwide for CEN national Members. Ref. No. EN 1794-2:2003 E Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 2 Contents page Foreword3 Introduction.4 1Scope 5 2Normative references 5 3Terms, defin
15、itions and symbols.5 4Requirements.6 5Test report 7 Annex A (normative) Resistance to brushwood fire8 Annex B (normative) Secondary safety : danger of falling debris.10 Annex C (normative) Environmental protection 15 Annex D (normative) Means of escape in emergency.16 Annex E (normative) Light refle
16、ction 17 Annex F (informative) Transparency.18 Bibliography23 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 3 Foreword This document (EN 1794-2:2003) has been prepared by Technical Committee CEN /TC 226 “Road equipment“,
17、 the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest by October 2003. This
18、document supersedes EN 1794-2:1998. This European standard consists of the following parts under the general title “Road traffic noise reducing devices - Non-acoustic performance“ : Part 1 : Mechanical performance and stability requirements Part 2 : General safety and environmental requirements Anne
19、xes A to E of this part of EN 1794 are normative and annex F is informative. Another standard covering long term durability (service life) is in course of preparation. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to impl
20、ement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Fri
21、Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 4 Introduction While performing their primary function, road traffic noise reducing devices should not pose hazards to road users or other people in the vicinity or to the environment at large. Noise reducing devices shoul
22、d not assist the spread of fire from adjacent verges or nearby land. Fire resistance in accordance with particular standards can in addition be required to minimise risk to adjacent premises, or to road users in confined corridors. Noise reducing devices should not reflect light in such a way as to
23、prejudice road safety. They should be made from materials which do not emit noxious fumes or leachates as the result of natural or industrial processes, or as the result of fire. Noise reducing devices should allow a means of escape by road users and access by operatives in the event of an emergency
24、. Noise reducing devices are not in general expected to resist the impact of vehicles, but designers can need information about the consequences of such impact load to establish the requirements for protection of road users and passers by. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56
25、:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 5 1 Scope This European Standard specifies minimum requirements and other criteria for assessing the general safety and environmental performance of road traffic noise reducing devices under typical roadside conditions. Requirements f
26、or more onerous conditions are a matter for consideration by the designer. Appropriate test methods are provided where these are necessary, but for some aspects a declaration of material characteristics may be required for the information of designers. The treatment of each topic is covered separate
27、ly in annexes A to F. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent a
28、mendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 410, Glass in building - Determination of luminous
29、 and solar characteristics of glazing. EN 1794-1: 1998, Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical performance and stability requirements. EN 2155-5, Aerospace series -Test methods for transparent materials for aircraft glazing Part 5: Determination of visibl
30、e light transmission. EN ISO 2813, Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (ISO 2813:1994, including Technical Corrigendum 1:1997) 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this European Standard, the fo
31、llowing terms and definitions apply: 3.1.1 noise barrier noise reducing device which obstructs the direct transmission of airborne sound emanating from road traffic 3.1.2 cladding noise reducing device which is attached to a wall or other structure to reduce the amount of sound reflected 3.1.3 cover
32、 noise reducing device which either spans or overhangs the highway 3.1.4 structural element element whose primary function is to support or hold in place acoustic elements 3.1.5 acoustic element element whose primary function is to provide the acoustic performance of the device Licensed Copy: sheffi
33、eldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 6 3.2 Symbols m angle at which reflections from the surface of the transparent material obscure the view through the material, in degree ; n angle of transparency (see Figure F.1), in degrees ; n
34、 angle of opacity (see Figure F.1), in degrees ; KA visual acuity factor (see Figure F.2), in degrees ; LT light transmission index (as determined in accordance with EN 410 or EN 2155-5), in per cent ; SO area of opaque features within transparent elements, in square millimetres ; ST total area of t
35、ransparent elements, including horizontal features, in square millimetres ; T transparency, in percent ; Tr transparency looking right, in percent ; Tl = Transparency looking left, in percent ; TD dynamic transparency, in percent ; TS static transparency, in percent. 4 Requirements 4.1 Resistance to
36、 brush fire The noise reducing device shall be classified in accordance with annex A. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for resistance to brushwood fire. 4.2 Secondary safety (falling debris) When a secondary safety has to be assessed
37、, this shall be done in accordance with annex B. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for secondary safety. 4.3 Environmental protection The constituent materials and their breakdown products shall be identified in accordance with annex
38、C. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for environmental protection. 4.4 Means of escape in emergency The acoustic and mechanical performances of doors or other means of escape shall be assessed in accordance with annex D. NOTE This Eur
39、opean Standard permits specifying authorities to indicate that there is no requirement for means of escape in emergency. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 7 4.5 Reflection of light The results of a standard t
40、est of reflectivity shall be quoted in accordance with annex E. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for light reflection. 4.6 Transparency The results of a standard test of transparency should be quoted in accordance with annex F. NOTE
41、This European Standard permits specifying authorities to indicate that there is no requirement for transparency. 5 Test report 5.1 Every test report on aspects of performance shall include the following information : a) number and year of this European Standard, EN 1794-2:1998 ; b) full description
42、of the element or system tested, including manufacturer(s), part numbers, place and date of origin ; c) description of the method of sampling, if parts of manufactured elements are evaluated by testing ; d) place and date of assessment, and the name of the assessor ; e) sufficient description of any
43、 tests carried out, any results measured and the conclusions drawn about the product together with any illustrations or photographs, all as specified in the appropriate annex. 5.2 A summary report shall be produced, identifying the aspects of performance for which detailed reports are available and
44、the level of performance assessed, where appropriate. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1794-2:2003 (E) 8 Annex A (normative) Resistance to brushwood fire A.1 General A noise reducing device can be exposed to fire arising fr
45、om dry vegetation or other material in close proximity. More severe fires from spilt fuel can arise as the result of traffic accidents. Where a noise reducing device is in close proximity to property it can also be necessary to consider the need to ensure that fire is not spread from the highway. Wh
46、ere flammable systems are used, it is recommended that firebreaks of fire-resistant materials or other design are incorporated into the noise reducing device in order to prevent the propagation of fire. This annex is not applicable to such fire resistant material. This annex describes a test for a r
47、epresentative panel of a vertical noise barrier under normal exposure to brushwood fires at the roadside. It does not provide information on the results of exposure to more severe conditions e.g. ignition by burning spilt fuel. The test should not be used to provide information on the fire safety of
48、 claddings used for tunnels or partial covers over the highway. A.2 Requirements The noise reducing device, after being tested by the method given in A.3, shall be classified as follows : class 1 : if the panel has been damaged to a greater extent than as defined for classes 2 and 3 ; class 2 : if t
49、he damaged area above either source is less than 0.06 m2 and extends to no more than 200 mm above the base of the panel, and the panel has not been burnt through to the other side ; class 3 : if there is no damage other than discoloration. A.3 Fire test A.3.1 Acoustic elements of at least 2 m long by 1,5 m high shall be tested by exposure to localised sources of fire at its base next to the front and rear faces independently. Panels shall be free of absorbed water before testing; in