BS EN 12812-2008 Falsework Performance requirements and general design《脚手架 性能要求和总体设计》.pdf
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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12812:2008Falsework Performance requirements and general designLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2011 08:38, Uncontrolled Copy, (c) BSIBS EN 1281
2、2:2008 BRITISH STANDARDA 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 correctapplication. BSI 2011 ISBN 978 0 580 60505 5 ICS 91.220
3、 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDateT e x t a f f e c t e dNational forewordThis British Standa
4、rd is the UK implementation of EN 12812:2008. It supersedes BS EN 12812:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/514, Access and support equipment.The design methodology within BS EN 12812:2008 is significantly different from that in BS 59
5、75. Technical Committee B/514 advises that caution should be taken when applying BS EN 12812:2008.BS EN 12812:2008 specifies performance requirements for the design of falsework in accordance with one of three classes: A, B1 and B2. Limit state design methods are specified for design Classes B1 and
6、B2. It does not provide guidance for the structural design of Class A. BS 5975, which exists in parallel with this standard and provides recommendations on the design of falsework, without definition of classes or physical parameters and using permissible stress methods, is recommended by Technical
7、Committee B/514 as a suitable method for the structural design of Class A falsework, as defined in BS EN 12812:2008.The Bragg Report, published in 1975 by the Advisory Committee on Falsework, first introduced a minimum lateral stability force. This force was subsequently incorporated, as a minimum h
8、orizontal disturbing force of 2.5 % of the applied vertical load in BS 5975, assuming first-this force has made a significant contribution to the safe use of falsework in the UK since its introduction. Technical Committee B/514 also advises that BS EN 12812:2008 does not recommend a minimum horizont
9、al force.BS EN 12812:2008 does not provide guidance on procedures necessary for the successful management of work on site. The recommendations of the Bragg Report in respect of the falsework coordinator have not been included in it. BS 5975 includes procedural controls for all temporary works, inclu
10、ding falsework, for the design, independent checking of the design, and for the successful management of work on site, including the appointment of a temporary works coordinator. Technical Committee B/514 reaffirms the importance of these controls.This standard contains a National Annex NA that prov
11、ides informative guidance on its application. It should be noted that there are a number of textual and numerical differences between the 2004 and 2008 editions; only those that are considered to be material are commented on in the National Annex NA. It is therefore not a comprehensive listing of al
12、l of the differences. Further, the UK committee advises that the symbols used in this standard should be read with caution.order analysis. Technical Committee B/514 advises that the application of Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2011 08:38, Uncontrolled Copy, (c) BSIEURO
13、PEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12812July 2008ICS 91.220 Supersedes EN 12812:2004 English VersionFalsework - Performance requirements and general designEtaiements - Exigences de performance et mthodes deconception et calculsTraggerste - Anforderungen, Bemessung und EntwurfThis European
14、 Standard was approved by CEN on 7 June 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning
15、such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own languag
16、e and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembo
17、urg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of
18、 exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12812:2008: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2011 08:38, Uncontrolled Copy, (c) BSIEN 12812:2008 (E) 2 Contents Page Foreword. 3 Introduction 4 1 Scope . 5 2 Normative refer
19、ences . 5 3 Terms and definitions. 6 4 Design classes 7 4.1 General. 7 4.2 Design class A 7 4.3 Design class B 7 5 Materials 8 5.1 General. 8 5.2 Basic requirements for materials 8 5.3 Weldability . 8 6 Brief 8 7 Design requirements 8 7.1 General. 8 7.2 Thickness of material . 9 7.3 Connections 9 7.
20、4 Flexibility of prefabricated support towers 9 7.5 Foundation 10 7.6 Towers providing support . 12 8 Actions. 13 8.1 General. 13 8.2 Direct actions 13 8.3 Indirect actions . 17 8.4 Other actions “Q9” 17 8.5 Load combinations. 17 9 Structural design for classes B1 and B2 18 9.1 Technical documentati
21、on 18 9.2 Structural design 20 9.3 Imperfections and boundary conditions 23 9.4 Calculation of internal forces 30 9.5 Characteristic values of resistance and friction values . 37 Annex A (informative) Relation with site activities . 40 Annex B (informative) . 41 Bibliography . 42 BS EN 12812:2008Lic
22、ensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/04/2011 08:38, Uncontrolled Copy, (c) BSIEN 12812:2008 (E) 3 Foreword This document (EN 12812:2008) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat of which is held by DIN. This European Standard s
23、hall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2009, and conflicting national standards shall be withdrawn at the latest by January 2009. Attention is drawn to the possibility that some of the elements of this d
24、ocument 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 12812:2004. This European Standard is one of a package of standards that includes also EN 12810-1, EN 12810-2, EN 12811-1, EN 12811
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