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1、BRITISH STANDARD BS EN 12812:2004 Falsework Performance requirements and general design The European Standard EN 12812:2004 has the status of a British Standard ICS 91 220 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12812:2004 Th
2、is British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 December 2004 BSI 10 December 2004 ISBN 0 580 44834 7 National foreword This British Standard is the official English language version of EN 12812:2004. The UK participation in its preparation
3、was entrusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/26, Falsework, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Additional information BS EN 12812:2004 specifies perf
4、ormance 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 B2. It does not provide guidance for the structural design of Class A. BS EN 12812:2004 does not provide guidance on procedures n
5、ecessary for the successful management of work on site. The recommendations of the Advisory Committee on Falsework (the “Bragg Report”1 21) in respect of the falsework coordinator have not been included in it. BS 5975:1996 exists in parallel with this standard and provides recommendations on the des
6、ign of falsework using permissible stress methods and on procedures for the successful management of work on site, including the appointment of a falsework coordinator. The procedural recommendations are re-affirmed by Technical Committee B/514. With reference to the NOTE to 5.2.1, there are no furt
7、her requirements to 5.2.1. 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; monitor related international and European developments and promulgate them i
8、n the UK. 1)1 BRAGG, S.L. (DEPARTMENT OF EMPLOYMENT, DEPARTMENT OF THE ENVIRONMENT). Interim Report of the Advisory Committee on Falsework, London, HMSO, 1974. 2 BRAGG, S.L. (DEPARTMENT OF EMPLOYMENT, DEPARTMENT OF THE ENVIRONMENT). Final Report of the Advisory Committee on Falsework, London, HMSO,
9、1975. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12812:2004 BSI 10 December 2004 i Textual errors The textual errors set out below were discovered when the English language
10、 version of EN 12812 was adopted as the national standard. They have been reported to DIN in a proposal to amend the text of the European standard. 7.2.2 Steel scaffold tubes “4.2.2.1” should be amended to “4.2.1.3”. 7.6 Towers providing support The sentence in bold in Clause 8 (“The cross-sectional
11、 shape of a support structure shall be maintained at the top and bottom, e.g. by bracing or stiffened planes.”) should be moved to 7.6 and be put in regular typeface. 8 The cross-sectional shape of a support structure shall be maintained at the top and bottom, e.g. by bracing or stiffened planes.Act
12、ions The sentence “8 The cross-sectional shape of a support structure shall be maintained at the top and bottom, e.g. by bracing or stiffened planes. Actions” should be amended to read: “8 Actions” 8.2.5.2 Debris effect “Fw,2,d” should be amended to “Fw”. 8.2.6 Seismic effects “8.2.6 Seismic effects
13、” should be amended to “8.2.6 Seismic effects Q7” 8.3 Indirect actions Q7 “Q7” should be amended to “Q8”. Table 1 Load combinations Line 8: “Q6” should be amended to “Q5”. Line 9: “Q7” should be amended to “Q6”. Line 10: “Q7” should be inserted in the first column to the left-hand side of “Seismic”
14、and a horizontal line should be inserted between the new “Q6” and “Q7” in the table. NOTE to Figure 5 Examples for calculation of imperfections of joints “See 9.3.2.1 to 9.3.2.3 for symbol definitions” should be amended to “See 9.3.2.1 and 9.3.2.2 for symbol definitions”. 9.4.2.4.1 Shear stiffness o
15、f bracing with tube and couplers Line 3: “Figure 11” should be amended to “Figure 12”. Equation (22) Change “b” to “nb”. Figure 11 b) Theoretical brace Both the “” should be amended to “i”. Figure 12 Explanation of symbols for calculation of tube and fitting frame stiffness In the right hand figure,
16、 “T1” should be amended to “Si”. NOTE to Figure 12 Explanation of symbols for calculation of tube and fitting frame stiffness “NOTE” should be amended to “NOTE 1”. A second note should be added as follows: “NOTE 2In this example all bays have the same height.” (This note has been moved from 9.4.2.4.
17、2.) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12812:2004 ii BSI 10 December 2004 Equation (23) “l” should be amended to “li”. Figure 13 Explanation of symbols for calculation of timber frames NOTE below the figure title: The note
18、 “NOTEIn this example all bays have the same height” should be deleted. Table 3 Displacement moduli for timber connections In the definition in the line above the NOTE, “d2” should be amended to “d”. 9.4.2.5.1 Stiffening of free-standing lattice towers Line 4: “Figure 11b)” should be amended to “Fig
19、ure 12”. Line 13: “Hd,i” should be amended to “Hd”. Line 16: “” should be amended to “2”. 9.4.2.5.2 Stiffening of truss beams Line 2: “CT4” should be amended to “Si”. Annex B Friction coefficients “Annex B (informative)” should be inserted after Annex A, e) and the heading “Friction coefficients” sh
20、ould be centred underneath this heading and its type size increased to the same size. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Corre
21、spondence 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 application. Compliance with a British Standard does not
22、of itself confer immunity from legal obligations. Attention is drawn to the following statutory regulation: The Construction (Design and Management) Regulations 1994. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 49 and a
23、 back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12812 June 2004 ICS 91.220 Eng
24、lish version Falsework - Performance requirements and general design Etaiements - Exigences de performance et mthodes de conception et calculs Traggerste - Anforderungen, Bemessung und Entwurf This European Standard was approved by CEN on 10 December 2003. CEN members are bound to comply with the CE
25、N/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 concerning such national standards may be obtained on application to the Central Secretariat or to
26、 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 own language and notified to the Central Secretariat has the same status as the official versions
27、. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerla
28、nd and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN
29、12812:2004: E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12812:2004 (E) 2 Contents Page 1 Scope 5 2 Normative references . 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. 8 5 M
30、aterials. 8 5.1 General. 8 5.2 Basic requirements for materials 8 5.3 Weldability . 8 6 Brief 9 7 Design requirements 9 7.1 General. 9 7.2 Thickness of material . 9 7.3 Connections 10 7.4 Flexibility of prefabricated support towers 10 7.5 Foundation. 11 7.6 Towers providing support 13 8 Actions. 13
31、8.1 General. 13 8.2 Direct actions 14 8.3 Indirect actions “Q7“. 17 8.4 Load combinations. 18 9 Structural design. 19 9.1 Technical documentation. 19 9.2 Structural design. 20 9.3 Imperfections and boundary conditions 24 9.4 Calculation of internal forces 30 9.5 Characteristic values of resistance a
32、nd friction values 38 Annex A (informative) Relation with site activities . 40 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12812:2004 (E) 3 Foreword This document (EN 12812:2004) has been prepared by Technical Committee CEN/TC 53 “Tem
33、porary works equipment”, the secretariat of which is held 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 December 2004, and conflicting national standards shall be withdrawn at the latest
34、 by December 2004. No other international organisation has been involved. This European Standard is one of a package of standards that includes also EN 12810-1,EN 12810-2, EN 12811-1, EN 12811-2, EN 12811-3, EN 12813. This European Standard does not replace any other European Standard. This European
35、 Standard was prepared as part of a group, see above. It gives some information about products covered by: scaffold tube in accordance with EN 39; scaffold couplers in accordance with EN 74; adjustable telescopic props in accordance with EN 1065. The standard is not mandated. However cognisance of t
36、wo European Directives should be taken. These are: Council Directives 89/391/EEC and 92/57/EEC. The Annexes A and B are informative. This document includes a bibliography According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to i
37、mplement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United King
38、dom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12812:2004 (E) 4 Introduction Most falsework is used: to carry the loads due to freshly poured concrete for structures until these structures have reached a sufficient load bearing capa
39、city; to absorb the loads from structural members, plant and equipment which arise during the erection, maintenance, alteration or removal of buildings or other structures; additionally, to provide support for the temporary storage of building materials, structural members and equipment. This Europe
40、an Standard gives performance requirements for those who specify and use falsework and gives methods to design falsework to meet those requirements. Clause 9 provides design methods. It legitimizes simplified design methods for falsework made of tube and couplers already successfully in use. The inf
41、ormation on structural design is supplementary to the relevant structural Eurocodes. The standard describes different design classes. This allows the designer to choose between more or less complex design methods, while achieving the same level of structural safety. Because European Standards for ma
42、terials do not exist to support the standard fully, it has been prepared permitting equivalent national standards to be used. Publication of a European Standard always results in the withdrawal of equivalent national standards. Provision for specific personal safety matters is dealt with in EN 12811
43、-1:2003 and other documents. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:37:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12812:2004 (E) 5 1 Scope This European Standard specifies performance requirements and limit state design methods for two design classes of falsework. It sets ou
44、t the rules that a designer has to take into account to produce a safe falsework structure. It also provides information for the person who requires falsework to support a “permanent structure“ and who needs to commission its design or supply. This European Standard also gives information on foundat
45、ions. This European Standard does not specify requirements for formwork, although formwork may be a part of the falsework construction. Nor does it provide information on access and working scaffolds, which is given in EN 12811-1:2003. This European Standard does not provide information about site a
46、ctivities. It does not provide information about the use of some standardized products, including beams conforming to EN 13377 and props conforming to EN 1065. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normativ
47、e references are cited at the appropriate places in the text and the publications 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 referenc
48、es the latest edition of the publication referred to applies (including amendments). EN 74, Couplers, loose spigots and base-plates for use in working scaffolds and falsework made of steel tubes Requirements and test procedures. EN 1065:1998, Adjustable telescopic steel props Product specifications,
49、 design and assessment by calculation and tests. EN 1990, Eurocode Basis of structural design. ENV 1991 (all parts including EN 1991-1-1, EN 1991-1-2, prEN 1991-1-3 and prEN 1991-2), Eurocode 1 Basis of design and actions on structures. ENV 1992 (all parts), Eurocode 2 Design of concrete structures. ENV 1993 (all parts), Eurocode 3 Design of steel structures. ENV 1994 (all parts), Eurocode 4 Design of composite steel and concrete structures