1、BSI Standards PublicationBS EN 12811-4:2013Temporary works equipmentPart 4: Protection fans for scaffolds Performance requirements and productdesignBS EN 12811-4:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12811-4:2013.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee B/514/42, Access and working platforms.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its corr
3、ectapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 75729 7ICS 91.220Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Co
4、mmittee on 31 December 2013.Amendments issued since publicationDate Text affectedBS EN 12811-4:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12811-4 November 2013 ICS 91.220 English Version Temporary works equipment - Part 4: Protection fans for scaffolds - Performance requirements and pr
5、oduct design quipements temporaires de chantiers - Partie 4: Pare-gravats pour chafaudages - Exigences de performance et conception du produit Temporre Konstruktionen fr Bauwerke - Teil 4: Schutzdcher fr Arbeitsgerste - Leistungsanforderungen, Entwurf, Konstruktion und Bemessung des Produkts This Eu
6、ropean Standard was approved by CEN on 28 September 2013. 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 referenc
7、es 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 (English, French, German). A version in any other language made by translation under the responsibility of a CEN me
8、mber 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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, F
9、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES
10、 KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12811-4:2013: EBS EN 12811-4:2013EN 12811-4:2013 (E) 2 Contents Page Foreword 4 Introduction
11、.5 1 Scope 6 2 Normative references 6 3 Terms and definitions .6 4 Classification 8 4.1 Rules for classification .8 4.2 Snow loading classification 8 4.3 Shape classification 8 4.4 Width classification .9 5 Designation 9 6 Materials .9 6.1 General 9 6.2 Specific material requirements 9 6.2.1 Steel 9
12、 6.2.2 Timber 10 7 General requirements . 10 7.1 General . 10 7.2 Dimensions 10 7.2.1 Width 10 7.2.2 Minimum inclination of protection fan 11 7.3 Components and elements 11 7.3.1 Couplers 11 7.3.2 Steel scaffold tubes (circular) . 11 7.3.3 Aluminium scaffold tubes (circular) . 12 8 Requirements for
13、design . 12 8.1 Basic requirements 12 8.1.1 General . 12 8.1.2 Arresting surface 12 8.1.3 External support . 12 8.1.4 Fixings for protection fans 12 8.2 Structural design 12 8.2.1 Method of design 12 8.2.2 Special requirements for timber 12 8.2.3 Partial safety factor 13 8.3 Actions . 13 8.3.1 Gener
14、al . 13 8.3.2 Permanent and variable imposed loads . 14 8.3.3 Variable Imposed loads: Class V1 14 8.4 Load combinations . 15 8.5 Falling object impact loads 15 9 Testing to verify performance . 15 9.1 Purpose of testing 15 9.2 General . 16 9.3 General description of test components 16 9.3.1 Test sam
15、ple . 16 BS EN 12811-4:2013EN 12811-4:2013 (E) 3 9.3.2 Test impactor . 16 9.4 Test . 16 9.4.1 Principle of the test . 16 9.4.2 Test set up 16 9.4.3 Test procedure . 17 9.4.4 Results to be recorded 18 9.4.5 Compliance with the testing requirements . 18 9.4.6 Test report 18 10 Assessment of compliance
16、 18 11 Manuals 19 11.1 General . 19 11.2 Content of a product manual . 19 12 Marking . 19 Bibliography 21 BS EN 12811-4:2013EN 12811-4:2013 (E) 4 Foreword This document (EN 12811-4:2013) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat of which is held
17、by DIN. 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 May 2014, and conflicting national standards shall be withdrawn at the latest by May 2014. Attention is drawn to the possibility that some o
18、f the elements of this document 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 European Standard is part of a series of standards EN 12811, Temporary works equipment, which consists of the following parts: Par
19、t 1: Scaffolds Performance requirements and general design; Part 2: Information on materials; Part 3: Load testing; Part 4: Protection fans for scaffolds Performance requirements and product design. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the follow
20、ing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, No
21、rway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12811-4:2013EN 12811-4:2013 (E) 5 Introduction Each year, many objects fall from a height and strike people. Often, this leads to serious injury, because the impact is on the head. T
22、his statistic does not take into account the many near misses. The dangers associated with falling objects has been recognized by the European Commission, which dealt with the matter by writing an amendment to the Work Equipment Directive (89/655/EEC) that deals exclusively with work at height (2001
23、/45/EEC) and requires the prevention of objects falling off scaffolds. Usually the provision for preventing such dangerous occurrences takes the form of a “toe-board” attached to the edge of the platform. However, toe-boards according to EN 12811-1 should be at least 150 mm high and statistics indic
24、ate that they are not always effective. Therefore, additional protection is often specified, by local by-laws, especially for scaffolds erected above areas where members of the public cannot be prevented from entering, for example in city and town centres. One way of satisfying these local regulatio
25、ns is to provide a protection fan attached to the main scaffold at some distance below the working platform. Because these protection fans are required to arrest the fall of substantial objects such as bricks, blocks, scaffold boards and the like, they could be considered as a necessary safety-criti
26、cal accessory for scaffolds. This, coupled with the fact that they have to arrest the fall of significant objects, i.e. subjected to significant dynamic loads, puts them in the category of complex structures. Yet, in many European countries, there are no rules to govern the design and installation o
27、f protection fans. Across much of Europe, protection fans are: erected in configurations that are not verified; and attached arbitrarily to scaffolds. That is to say, the information related to protection fans, such as it is, is very basic. Under the suite of standards drawn up by CEN TC 53, Tempora
28、ry works equipment has had its design formalized across Europe. The current situation is that un-designed and unverified components are being attached to scaffolds. Therefore, it is necessary to formalize the design and erection of protection fans. BS EN 12811-4:2013EN 12811-4:2013 (E) 6 1 Scope Thi
29、s European Standard specifies product requirements, methods of structural and general design and tests for protection fans for scaffolds to protect workers as well as members of public from objects that may fall off the outside edge of scaffolds being used close to where they are working or passing
30、by. This European Standard only applies to protection fans while the scaffold is being used as a working place. Protection fans attached to structures other than scaffolds as defined in EN 12811-1 are outside the scope of this European Standard. This European Standard applies only to protection fan
31、systems on to which construction debris may fall from 24 m or less. This European Standard ensures resistance of protection fans for most blunt falling objects representing an impacting energy not exceeding 720 J. NOTE This energy corresponds to a 3 kg object falling from 24 m. This European Standar
32、d does not cover the requirements for the total area to be protected against falling items. 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
33、. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 74 (all parts), Couplers, spigots and baseplates for use in falsework and scaffolds EN 338, Structural timber Strength classes EN 1990, Eurocode Basis of structural design EN 1993-1-1, Euro
34、code 3: Design of steel structures Part 1-1: General rules and rules for buildings EN 1995-1-1, Eurocode 5: Design of timber structures Part 1-1: General rules and rules for buildings EN 1999-1-1, Eurocode 9: Design of aluminium structures Part 1-1: General structural rules EN 12810-1:2003, Faade sc
35、affolds made of prefabricated components Part 1: Products specifications EN 12811-1:2003, Temporary works equipment Part 1: Scaffolds Performance requirements and general design EN 12811-2, Temporary works equipment Part 2: Information on materials 3 Terms and definitions For the purposes of this do
36、cument, the terms and definitions given in EN 12811-1:2003 and the following apply (see also Figure 1). BS EN 12811-4:2013EN 12811-4:2013 (E) 7 (a) example of a horizontal protection fan (b) example of an inclined protection fan Key 1 ties 2 protection fan 3 fan tie 4 scaffold 5 stiff structure Figu
37、re 1 Examples of protection fan systems 3.1 protection fan system set of interconnected components used for the purpose of arresting falling objects, which includes (a) an assessed set of configurations and (b) the product manual 3.2 component part of a protection fan system which cannot be dismantl
38、ed further Note 1 to entry: For example a support or a vertical frame. 3.3 element integral part of a component Note 1 to entry: For example a welded connection. 3.4 connection device device for the connection of components 3.5 configuration particular arrangement of connected components 3.6 protect
39、ion fan configuration configuration of the protection fan system comprising a complete scaffold or a representative section from it BS EN 12811-4:2013EN 12811-4:2013 (E) 8 3.7 arresting surface surface on which falling object is interrupted and prevented from falling any further 3.8 protection fan c
40、omplete assembly of the arresting surface and its immediate structural support members 3.9 scaffold bay length of scaffold defined by two consecutive standards Note 1 to entry: For example, two bays are defined by three consecutive standards. 4 Classification 4.1 Rules for classification Protection
41、fans shall be classified in accordance with the requirements of Table 1. Table 1 Classification of protection fans Classification criteria Classes Snow Load SL0 or SL1 in accordance with Table 2 Shape V0 or V1 in accordance with Table 3 Width B1 to B7 in accordance with Table 4 4.2 Snow loading clas
42、sification The standard specifies two snow loading classes as shown in Table 2. Table 2 Snow loading classes of protection fans Classification Snow load Class SL0 No snow load Class SL1 With snow load 4.3 Shape classification The standard specifies two shape classes as shown in Table 3. Table 3 Shap
43、e classes Classification of protection fan Shape characteristic Class V0 With horizontal (or partial horizontal) surface or inclination 30 see Figure 1(a) Class V1 With (uniform) inclined surface (30) see 7.2.2 see Figure 1(b) Class V0 shall only be chosen if the access onto the protection fan is pr
44、evented in the standard set of system configurations. BS EN 12811-4:2013EN 12811-4:2013 (E) 9 Class V0 shall have a vertical or inclined upstand at the edge which shall have a vertical height of not less than 50 cm. 4.4 Width classification This European Standard specifies seven width classes as fol
45、lows: Table 4 Width classes Width classification B1 B2 B3 B4 B5 B6 B7 Minimum width m 0,6 0,9 1,2 1,5 1,8 2,1 2,4 The width class chosen shall depend on a risk assessment, which demonstrates that it is adequate. NOTE 1 In some EU member states national regulations or other requirements do not allow
46、some of the width classes. NOTE 2 B is defined in Figure 2. 5 Designation The designation of a scaffold system shall consist of the following parts: Protection fan EN 12811-4 Shape Class Load Class Width Class V0 Horizontal surface SL0 No snow load BX (1 X 7) V1 Inclined surface SL1 With snow load F
47、or example: EN 12811-4 V0 B5 means a protection fan system with a horizontal or partial horizontal surface designed for snow load and with a width corresponding to B5 taken from Table 4. 6 Materials 6.1 General Materials shall be selected from European or international standards. Materials shall ful
48、fil the requirements given in the appropriate European Standards where design data is provided. Materials shall be free from any impurities and defects which may affect their satisfactory use. Materials used shall be sufficiently robust and durable to withstand normal working (and storage) condition
49、s. Information about the most commonly used materials is given in EN 12811-2. 6.2 Specific material requirements 6.2.1 Steel Steels of de-oxidation type FU (rimming steels) shall not be used. BS EN 12811-4:2013EN 12811-4:2013 (E) 10 Information on common types of corrosion protection is given in EN 12811-2. 6.2.2 Timber Timber shall be stress graded in accordance with EN 338. If a protective coating is used, it shall not prevent the discovery of defects in the material. Plywood shall have at least 5 plies and shal
