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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1794-2:1998 The Eur
2、opean Standard EN 1794-2:1998 has the status of a British Standard ICS 93.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Road traffic noise reducing devices Non-acoustic performance Part 2: General safety and environmental requirements Licensed Copy: sheffieldun sheffi
3、eldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 November 1998 BSI 199
4、8 ISBN 0 580 30455 8 BS EN 1794-2:1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 1794-2:1998. The UK participation in its preparation was entrusted by Technical Committee B/509, Road equipment, to Subco
5、mmittee B/509/6, Fences for the attenuation of noise, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international a
6、nd European developments and promulgate them in the UK. A list of organizations represented 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
7、 BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respons
8、ible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. Licensed Copy: sheffieldun sheffieldun,
9、na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means
10、 reserved worldwide for CEN national Members. Ref. No. EN 1794-2:1998 E EUROPEAN STANDARDEN 1794-2 NORME EUROPE ENNE EUROPA ISCHE NORM July 1998 ICS 93.080.30 Descriptors: Environmental protection, acoustics, noise: sound, roads, traffic lanes, acoustic shields, noise reduction, tests, safety, fire
11、resistance, emergency exits, reflection, transparency English version Road traffic noise reducing devices Non-acoustic performance Part2: General safety and environmental requirements Dispositifs de re duction du bruit du trafic routier Performances non acoustiques Partie 2: Prescriptions ge ne rale
12、s pour la se curite et lenvironnement La rmschutzeinrichtungen an Straen Nichtakustische Eigenschaften Teil 2: Allgemeine Sicherheits- und Umweltanforderungen This European Standard was approved by CEN on 21 June 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which s
13、tipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standar
14、d exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standar
15、ds bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Co
16、py, (c) BSI Page 2 EN 1794-2:1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 226, Road equipment, 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 te
17、xt or by endorsement, at the latest by January 1999, and conflicting national standards shall be withdrawn at the latest by January 1999. This European Standard consists of the following Parts under the general title Road traffic noise reducing devices Non-acoustic performance: Part 1: Mechanical pe
18、rformance and stability requirements; Part 2: General safety and environmental requirements. Annexes 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 Intern
19、al Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland a
20、nd the United Kingdom. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions and symbols3 4Requirements4 5Test report4 Annex A (normative) Resistance to brushwood fire5 Annex B (normative) Secondary safety: danger of falling debris6 Annex C (normative) Environmental prote
21、ction6 Annex D (normative) Means of escape in emergency6 Annex E (normative) Light reflection7 Annex F (informative) Transparency7 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1794-2:1997 BSI 1998 Introduction While performing t
22、heir 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 should not assist the spread of fire from adjacent verges or nearby land. Fire resistance in accordance with particu
23、lar standards can in addition be required to minimize risk to adjacent premises, or to road users in confined corridors. Noise reducing devices should not reflect light in such a way as to prejudice road safety. They should be made from materials which do not emit noxious fumes or leachates as the r
24、esult 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. Noise reducing devices are not in general expected to resist the impact of vehicles, but designers may need i
25、nformation about the consequences of such impact load to establish the requirements for protection of road users and passers-by. 1 Scope This European Standard specifies minimum requirements and other criteria for assessing the general safety and environmental performance of road traffic noise reduc
26、ing devices under typical roadside conditions. Requirements for 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 can be required for the information
27、of designers. The treatment of each topic is covered separately 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 appropriate places in the text and the publications
28、 are listed hereafter. For dated references, subsequent amendments 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. EN 1793-1, Road tra
29、ffic noise reducing devices Test method for determining the acoustic performance Part 1: Intrinsic characteristics of sound absorption. EN 1793-2, Road traffic noise reducing devices Test method for determining the acoustic performance Part 2: Intrinsic characteristics of airborne sound insulation.
30、EN 2155-5:1989, Aerospace series Test methods for transparent materials for aircraft glazing Part 5: Determination of visible light transmission. EN 410, Glass in building Determination of luminous and solar characteristics of glazing. EN 1794-1:1998, Road traffic noise reducing devices Non-acoustic
31、 performance Part 1: Mechanical performance and stability requirements. ISO 2813, Paints and varnishes Determination of specular gloss of non metallic paint films at 208, 608 and 858. 3 Definitions and symbols 3.1 Definitions For the purposes of this standard, the following definitions apply: 3.1.1
32、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 noise reducing device which either spans o
33、r 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 3.2 Symbols amangle at which reflections from the surface of the
34、 transparent material obscure the view through the material, in degrees; anangle of transparency (see Figure F.2), in degrees; bnangle of opacity (see Figure F.2), in degrees; KAvisual acuity factor (see Figure F.1), in degrees; LTlight transmission index (as determined in accordance with EN 410 or
35、EN 2155-5), in per cent; SOarea of opaque features within transparent elements, in square millimetres; STtotal area of transparent elements, including horizontal features, in square millimetres; Ttransparency, in per cent; Trtransparency looking right, in per cent; TDdynamic transparency, in per cen
36、t; TSstatic transparency, in per cent. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1794-2:1997 BSI 1998 4 Requirements 4.1 Resistance to brushwood fire The noise reducing device shall be classified in accordance with annex A. N
37、OTEThis 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, this shall be done in accordance with annex B. NOTEThis European Standard permits spec
38、ifying 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 C. NOTEThis European Standard permits specifying authorities to indicate that there is no
39、 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. NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for
40、means of escape in emergency. 4.5 Light reflection The results of a standard test of reflectivity shall be quoted in accordance with annex E. NOTEThis European Standard permits specifying authorities to indicate that there is no requirement for light reflection. 4.6 Transparency The results of a sta
41、ndard test of transparency shall be quoted in accordance with annex F. NOTEThis 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) the nu
42、mber and year of this European Standard, EN 1794-2:1998; b) a full description of the element or system tested, including manufacturer(s), part numbers, place and date of origin; c) a description of the method of sampling, if parts of manufactured elements are evaluated by testing; d) the place and
43、date of assessment, and the name of the assessor; e) a sufficient description of any 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,
44、identifying the aspects of performance for which detailed reports are available and the level of performance assessed, where appropriate. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:56:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1794-2:1997 BSI 1998 Annex A (normative) Resi
45、stance to brushwood fire A.1 General A noise reducing device can be exposed to fire arising from 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
46、 also be necessary to consider the need to ensure that fire is not spread from the highway. Where 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. Thi
47、s annex is not applicable to such fire-resistant material. This annex describes a test for a representative 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 b
48、y burning spilt fuel. The test should not be used to provide information on the fire safety of 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 pan
49、el has been damaged to a greater extent than as defined for classes 2 and 3; class 2: if the damaged area above either source is less than 0,06 m2and 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 discolouration. 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 localized sources of fire at its base next to the front and rear faces independently. Pane
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