1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1794-2:2011Road traffic noise reducingdevices Non-acousticperformancePart 2: General safety and environmentalrequirementsBS EN 1794-2:2011 BRITISH STANDARDNational foreword
2、This British Standard is the UK implementation of EN 1794-2:2011. Itsupersedes BS EN 1794-2:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/509/6, Fences for the attenuation of noise.A list of organizations represented on this committee can beobt
3、ained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 68335 0ICS 93.080.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2011.Amendments issued since publicationDate Text affectedBS EN 1794-2:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1794-2 January 2011 ICS 93.080.30 Supersedes EN 1794-2:2003E
5、nglish Version Road traffic noise reducing devices - Non-acoustic performance - 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 Lrmschutzeinrichtunge
6、n an Straen - Nichtakustische Eigenschaften - Teil 2: Allgemeine Sicherheits- und Umweltanforderungen This European Standard was approved by CEN on 10 December 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stan
7、dard 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (Englis
8、h, 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bu
9、lgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE F
10、OR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1794-2:2011: EBS EN 1794-2:2011EN 1794-2:201
11、1 (E) 2 Contents page Foreword 3Introduction . 41 Scope 52 Normative references 53 Terms, definitions and symbols . 53.1 Terms and definitions . 53.2 Symbols 54 Requirements . 64.1 Resistance to brush fire 64.2 Secondary safety (falling debris) . 64.3 Environmental protection . 64.4 Means of escape
12、in emergency 64.5 Reflection of light. 64.6 Transparency . 75 Test report 7Annex A (normative) Resistance to brushwood fire 8Annex B (normative) Secondary safety: danger of falling debris 10Annex C (normative) Environmental protection . 14Annex D (normative) Means of escape in emergency . 15Annex E
13、(normative) Light reflection . 16Annex F (informative) Transparency . 18Bibliography 26BS EN 1794-2:2011EN 1794-2:2011 (E) 3 Foreword This document (EN 1794-2:2011) has been prepared by Technical Committee CEN /TC 226 “Road equipment“, the secretariat of which is held by AFNOR. This European Standar
14、d shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2011, and conflicting national standards shall be withdrawn at the latest by July 2011. Attention is drawn to the possibility that some of the elements of this docu
15、ment may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1794-2:2003. This European standard consists of the following parts under the general title “Road traffic noise reducing devices Non-a
16、coustic performance“: Part 1: Mechanical performance and stability requirements Part 2: General safety and environmental requirements The main changes compared to the previous edition are: a) the classification in Table B.1; b) the Annex E with introduction of a classification of products; c) the An
17、nex F completely revised. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
18、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 1794-2:2011EN 1794-2:2011 (E) 4 Introduction While performing their primary function, road traffic noise r
19、educing 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 particular standards can in addition be required t
20、o 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 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, o
21、r 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 can need information about the consequences of such i
22、mpact load to establish the requirements for protection of road users and passers by. BS EN 1794-2:2011EN 1794-2:2011 (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 d
23、evices 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 may be required for the information of de
24、signers. The treatment of each topic is covered separately in Annexes A to F. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refe
25、renced document (including any amendments) applies. EN 1794-1:2011, Road traffic noise reducing devices Non-acoustic performance Part 1: Mechanical performance and stability requirements EN ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (I
26、SO 2813:1994, including Technical Corrigendum 1:1997) 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 noise barrier noise reducing device which obstructs the direct transmission of airborne sound emanating
27、 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 or overhangs the highway 3.1.4 structural element element whose primary function is to support or hold i
28、n place acoustic elements 3.1.5 acoustic element element whose primary function is to provide the acoustic performance of the device 3.2 Symbols mangle at which reflections from the surface of the transparent material obscure the view through the material, in degrees; 0 angle between the visual axis
29、 and the normal to the noise reducing device (see Figure F.2), in degrees; n angle of transparency (see Figure F.2), in degrees; BS EN 1794-2:2011EN 1794-2:2011 (E) 6 nangle of opacity (see Figure F.2), in degrees; KAvisual acuity factor (see Figure F.3), in degrees; LTlight transmission index (as d
30、etermined in accordance with EN 410 or EN 2155-5), in percent; SOarea of opaque features within transparent elements, in square millimetres; STtotal area of transparent elements, including horizontal features, in square millimetres; T transparency, in percent; Trtransparency looking right, in percen
31、t; Tltransparency looking left, in percent; TDdynamic transparency, in percent; TSstatic transparency, in percent. 4 Requirements 4.1 Resistance to brush fire The noise reducing device shall be classified in accordance with Annex A. NOTE This European Standard permits specifying authorities to indic
32、ate that there is no requirement for resistance to brushwood fire. 4.2 Secondary safety (falling debris) When secondary safety has to be assessed, this shall be done in accordance with Annex B. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for se
33、condary safety. 4.3 Environmental protection The constituent materials and their breakdown products shall be identified in accordance with Annex C. 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
34、. NOTE This European Standard permits specifying authorities to indicate that there is no requirement for means of escape in emergency. 4.5 Reflection of light The results of a standard test of reflectivity shall be quoted in accordance with Annex E. NOTE This European Standard permits specifying au
35、thorities to indicate that there is no requirement for light reflection. BS EN 1794-2:2011EN 1794-2:2011 (E) 7 4.6 Transparency The results of a standard test of transparency should be quoted in accordance with Annex F. NOTE This European Standard permits specifying authorities to indicate that ther
36、e 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, i.e. EN 1794-2:2011; b) full description of the element or system tested, including manufacturer(s), part numbers
37、, 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 tests carried out, any results measured and the conclusions drawn about th
38、e 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 the level of performance assessed, where appropriate. BS EN 1794-2:2011EN 1
39、794-2:2011 (E) 8 Annex A (normative) Resistance 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
40、 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. 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 orde
41、r to prevent the propagation of fire. This 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
42、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 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 c
43、lassified 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 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 o
44、ther 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 bef
45、ore testing; in the case of timber components, the moisture content shall be reduced to 18 % by an approved drying method. The mass and dimensions of the panel to be tested shall be measured and the panel shall be photographed. An identical panel shall be examined to determine its construction; the
46、dimensions of its elements, including wall thickness of hollow sections, shall be measured and noted on a sketch at 1:20 scale. A.3.2 Testing shall be carried out in an enclosed fireproof and draught-free chamber having a volume of at least 150 m3. Fume extraction devices may be installed in or near
47、 the ceiling, but shall be prevented from fanning any flames during the test. BS EN 1794-2:2011EN 1794-2:2011 (E) 9 The temperature of the chamber, including the floor, before the test begins shall be between 15 C and 25 C. The chamber should be fitted with an observation port or window in a suitabl
48、e position to observe the panel during the test. A.3.3 Two identical sources of fire shall be prepared as follows: a) a rectilinear wire mesh basket 300 mm by 200 mm by 300 mm high shall be made from welded steel wire mesh, having a square mesh of 3 mm diameter drawn steel wire at 50 mm centres; b)
49、in addition, three 3 mm diameter wires 300 mm long shall be secured in a vertical position inside the basket, equispaced along the central line of the shorter dimension. The flammable material shall comprise shavings of spruce, 0,2 mm thick by 2 mm wide, and approximately 50 mm long. The material shall be free from splinters and have a maximum moisture content of 30 %; it shall be acclimatised at 20 C and 65 % relative humidity until its weight is constant. 600 g of shavings
