BS EN 12676-1-2000 Anti-glare systems for roads - Performance and characteristics《道路用防眩光系统 性能和特性》.pdf

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1、BRITISH STANDARD BS EN 12676-1:2000 Incorporating Amendment No. 1 Anti-glare systems for roads Part 1: Performance and characteristics The European Standard EN 12676-1:2000, with the incorporation of amendment A1:2003, has the status of a British Standard ICS 93.080.30 BS EN 12676-1:2000 This Britis

2、h Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 July 2000 BSI 11 July 2003 ISBN 0 580 34586 6 National foreword This British Standard is the offic

3、ial English language version of EN 12676-1:2000, including amendment A1:2003. The start and finish of text introduced or altered by CEN amendment A1 is indicated in the text by tags !“. Tags indicating changes to text carry the number of the amendment. For example, text altered by CEN amendment A1 i

4、s indicated by !“. In accordance with CEN amendment A1, the term “anti-glare systems” has been replaced by “anti-glare screens” throughout the document. These changes are not indicated in the text by tags. The UK participation in its preparation was entrusted to Technical Committee B/509, Road equip

5、ment which has the responsibility to: A list of organizations represented on this committee 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

6、the section entitled “International Standards Correspondence Index”, 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 applic

7、ation. Compliance with a British Standard does not of itself confer 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; mon

8、itor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 27 and a back cover. The BSI copyright notice displayed in this document indicates when the document was la

9、st issued. Amendments issued since publication Amd. No. Date Comments 14516 11 July 2003 See national foreword EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12676-1 March 2000 + A1 April 2003 ICS 93.080.30 English version Anti-glare systems for roads - Part 1: Performance and characteristics

10、(includes amendment A1:2003) Systmes anti-blouissement routiers - Partie 1: Performances et caractristiques (inclut lamendement A1:2003) Blendschutzsysteme fr Straen - Teil 1: Anforderungen und Eigenschaften (enthlt nderung A1:2003) This European Standard was approved by CEN on 18 February 2000 and

11、amendment A1 was approved by CEN on 9 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 lists and bibliographical references con

12、cerning such national standards may be obtained on application to the Central Secretariat 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 responsibility of a CEN member into its ow

13、n language and notified to the Central Secretariat 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, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sw

14、eden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Mem

15、bers. Ref. No. EN 12676-1:2000 + A1:2003 EPage 2 EN 12676-1:2000 BSI 11 July 2003 Contents Page Foreword. 3 Introduction . 4 1 Scope 4 2 Normative references 4 3 Definitions and symbols 5 4 Requirements 5 5 Marking. 8 6 Evaluation of Conformity. 8 Annex A (informative) Method for the calculation of

16、the effective height . 15 Annex ZA (informative) Clauses of this European Standard addressing the provisions of EU Construction Products Directive 22 Page 3 EN 12676-1:2000 BSI 11 July 2003 Foreword This European Standard has been prepared by Technical Committee CEN/TC 226, Road equipment, the secre

17、tariat 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 September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According t

18、o the CEN/CENELEC Internal 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, Spai

19、n, Sweden, Switzerland and the United Kingdom. This European Standard consists of the following Parts under the general title: Anti-glare systems for roads: - Part 1: Performance and characteristics; - Part 2: Test methods. NOTE This draft standard was submitted to the CEN Enquiry as prEN 12676:1999

20、. Annex A of this European Standard is informative. Foreword to amendment A1:2003 This document EN 12676-1:2000/A1:2003 has been prepared by Technical Committee CEN/TC 226, Road equipment, the secretariat of which is held by AFNOR. This amendment to the European Standard EN 12676-1:2000 shall be giv

21、en 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 January 2005. This document has been prepared under a mandate given to CEN by the European Commiss

22、ion and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard. According to the CEN/CENELEC International Regulations, the national standard organization

23、s of the following countries are bound to implement 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. Pa

24、ge 4 EN 12676-1:2000 BSI 11 July 2003 Introduction Anti-glare screens consist of manufactured equipment which reduces the glare of approaching headlights or of other external light sources. Anti-glare screens are generally installed on public roads when it is considered beneficial to reduce the effe

25、ct of glare. Common situations where anti-glare screens may be used are as follows: a) in the central reservation of dual carriageway roads and motorways; b) between parallel or converging roads where traffic is travelling in opposing directions; c) glaring light sources reflecting on installations

26、and buildings adjacent to the road; d) glaring light from installations and buildings adjacent to the road. The test methods for verification of conformity to the performance requirements of this standard are given in EN 12676-2. 1 Scope This part of EN 12676 specifies the characteristics of an anti

27、-glare screen in terms of its optical effectiveness and of the mechanical performance of its elements. It gives a method for the determination of the optical performance of anti-glare screen by calculation. Requirements and recommendations for the design of anti-glare screens to minimize maintenance

28、 are also given. This part of EN 12676 does not apply to: - types of anti-glare screens other than those attached to safety barriers; - regulatory characteristics which might be required to ensure that anti-glare systems are compatible with road signs; - specific requirements resulting from extreme

29、environmental conditions experienced in some European countries. 2 Normative references This part of EN 12676 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 he

30、reafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this part of EN 12676 only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 1317-2 Road restraint systems

31、Part 2: Performance classes, impact test acceptance criteria and test methods for safety barriers Page 5 EN 12676-1:2000 BSI 11 July 2003 ISO 1043-1 Plastics Symbols and abbreviated Part 1: Basic polymers with their special characteristics ISO 1043-2 Plastics Symbols Part 2: Fillers and reinforcing

32、materials ISO 9227 Corrosion tests in artificial atmospheres Salt spray tests EN 12676-2 Anti-glare systems for roads Part 2: Test methods 3 Definitions and symbols For the purposes of this part of EN 12676, the following definitions apply: 3.1 occluding element: element of the anti-glare screen blo

33、cking out light which would be distracting to road users 3.2 support: element onto which occluding elements are mounted 3.3 base: structure (safety barrier) to which the support is attached 3.4 fixing element: component, e.g. screw and nut, which enables the fastening of the occluding elements onto

34、the support, or the support onto its base NOTE The fixing elements of the anti-glare screen are part of the system. 3.5 light transmission factor, C ti : the proportion of incident light which passes through the anti-glare screen at a particular angle of incidence i 3.6 limiting angle, l : angle of

35、incidence below which incident light is completely blocked out by the anti-glare screen (C ti= 0) 4 Requirements 4.1 Design and fixation The anti-glare screen design shall consist of occluding elements which are mounted on a support (Figure 1) or directly on the base. Anti-glare screens shall only b

36、e fixed in the lower part and shall be designed to be compatible with safety barriers fulfilling the requirements of EN 1317-2. The complete fixed anti-glare screen, or parts of it, even fixing elements, may not project over the edge of the safety barrier. Nevertheless, it is allowed that the plasti

37、c parts of an anti-glare screen fixed on a concrete barrier may project up to 100 mm beyond the edge of the upper part of the barrier. Page 6 EN 12676-1:2000 BSI 11 July 2003 4.2 Maintenance Hollow bodies shall be closed at the top in order to prevent any dirt, snow and water from penetrating into t

38、hem and also to prevent birds from nesting inside. Anti-glare screens shall be designed in such a way to enable the replacement of any section of the system without having to remove adjacent parts in any way. NOTE Anti-glare screens should only require attention if damaged by vehicle impact or by ot

39、her unusually severe conditions. During its functional life time, it should resist minor impacts from stones. 4.3 Characteristics If accessibility is required, it shall fall into one of the two following categories: Category 1: designed to permit at any place the passage of personnel carrying stretc

40、hers from one side of the base to the other without the need to remove a section of the anti-glare screen. Category 2: not designed to permit access at any place, but requiring a section of the anti-glare screen to be removed to permit access. NOTE This design may be appropriate in areas, such as ur

41、ban areas, where it is desirable to prevent pedestrians climbing over the base. This category of anti-glare screens should permit sections to be removed by emergency service personnel. 4.4 Durability 4.4.1 Synthetic materials The durability of the synthetic materials shall be verified by testing the

42、 impact strength of specimens before and after ageing in accordance with EN 12676-2. When new, the relative difference between the values of tensile impact strength obtained at temperatures of (23 3) C and (-30 3) C shall not exceed 15 %. After ageing, the tensile impact test values shall be more th

43、an 80 % of their initial values for each of the tested specimens at (23 3) C and at (-30 3) C. Only ductile fractures are acceptable. 4.4.2 Metallic elements Metallic elements of the anti-glare system shall be made of, or coated with, corrosion resistant materials. Durability shall be assessed in ac

44、cordance with EN 12676-2. Parts which are made of, or coated with, synthetic materials shall be aged by the process described in EN 12676-2 before being tested. !Hot dipped galvanized steel components shall conform to ISO 1459 and ISO 1461. “ Page 7 EN 12676-1:2000 BSI 11 July 2003 4.5 Effectiveness

45、 with respect to glare 4.5.1 General The anti-glare screen shall reduce the level of light that would otherwise dazzle road users, as described below. It shall be effective over its full height, i.e. from the upper edge of the base on which it is mounted. However, a maximum gap of 20 mm is admissibl

46、e between the upper edge of the base and the bottom edge of the support or of the occluding elements. NOTE The height of the anti-glare screen depends on general conditions, such as the relative levels of vehicle headlights and the eyes of the drivers in the opposing traffic directions. The main fac

47、tors to be considered are the height of these above the road and their distance to the anti-glare screens. However, it may not be possible in every situation to completely eliminate the effect of glare because of conflicting road geometry. Annex A provides examples of the heights of anti-glare scree

48、ns needed to block out light for a number of typical cases. !Two types of products are distinguished: a) those designed in order “to block out all the incident rays“ They have to comply with the geometrical condition tan aj $ 0,33. This condition is checked by calculation (4.5.2); b) those which do

49、not comply with the condition tan aj $ 0,33 designed in order to “block out partially the incident rays“. They have to fulfil the threshold value indicated in 4.5.3. This characteristic is determined by test (4.5.3). “ 4.5.2 Verification by calculation Because of the way they are constructed, some systems totally block out the incident rays up to a limit angle l . For elements perpendicular to the axis of installation, this angle may be found by calculating