1、BS EN 74-2:2008ICS 91.220NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDCouplers, spigot pinsand baseplates foruse in falsework andscaffoldsPart 2: Special couplers Requirements and test proceduresLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/201
2、0 02:18, Uncontrolled Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2010 BSI 2010ISBN 978 0 580 68955 0Amendments/corrigenda issued since publicationDate CommentsBS EN 74-2:2008National forewordThis British Standard is
3、the UK implementation of EN 74-2:2008.The UK participation in its preparation was entrusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/21, Access and working scaffolds and their components (props, tubes and couplers).A list of organizations represented on this
4、committee can be obtained on request to its secretary.The EN 74 series is in three Parts which together replace EN 74:1988. EN 74:1988 was implemented in the UK as BS 1139-2.1:1991 but was withdrawn on the UK implementation of EN 74-1:2005.BS EN 74 Couplers, spigot pins and baseplates for use in fal
5、sework and scaffolds consists of the following parts:Part 1 (2005) Couplers for tubes - Requirements and test proceduresPart 2 (2008) Special couplers - Requirements and test proceduresPart 3 (2007) Plain base plates and spigot pins - Requirements and test The UK Subcommittee is preparing a National
6、 Application Document (NAD) to help users in the application of the EN 74 series. Any com-ments on the use of this part, or of the others in the series, or errors that are identified in the text should be notified to the B/514 Committee Secretary, BSI, 389 Chiswick High Road, London W4 4AL so that t
7、hey can be taken into account in developing the NAD.Additional informationFor other couplers used in the UK, but not included in BS EN 74-2 or BS EN 74-3, further information may be found in BS 1139-2.2:2009.Textual errorsThe textual errors set out below were discovered when adopting the text of the
8、 European standard. They have been reported to the DIN Secretariat in a proposal to amend the text of the European standard.In clause 4, against the symbol Fq, change share to shear.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
9、 correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 74-2September 2008ICS 91.220Englis
10、h VersionCouplers, spigot pins and baseplates for use in falsework andscaffolds - Part 2: Special couplers - Requirements and testproceduresRaccords, goujons dassemblage et semelles pourtaiements et chafaudages - Partie 2: Raccords spciaux- Exigences et modes opratoires dessaiKupplungen, Zentrierbol
11、zen und Fuplatten frArbeitsgerste und Traggerste - Spezialkupplungen - Teil2: Anforderungen und PrfverfahrenThis European Standard was approved by CEN on 9 August 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanSta
12、ndard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning 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
13、, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language 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, Czec
14、h 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 FOR STANDARDIZATIONCOMIT EUROPEN
15、DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 74-2:2008: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 0
16、2:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Symbols 8 5 Types and classification of special couplers .9 6 Transmissible internal forces, moments and related stiffnesses 10 6.
17、1 General10 6.2 Half coupler 11 6.3 Sleeve coupler with shear studs (SS)12 6.4 Reduction coupler .12 7 Reference tubes/bar for coupler tests.14 8 General requirements15 8.1 Materials .15 8.2 Design .15 8.3 Manufacturers drawings 17 8.4 Production control.17 9 Tests methods and evaluation of results1
18、7 9.1 General17 9.2 Half Couplers18 9.3 Sleeve couplers with shear studs (SS)27 9.4 Reduction couplers .30 10 Designation 30 11 Marking .31 12 Test report 31 13 Assessment31 14 Product Manual31 Annex A (informative) Ongoing production control 33 Annex B (informative) Information about the design of
19、temporary works structures .35 B.1 General35 B.2 Structural design .35 Bibliography 41 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 3 Foreword This document (EN 74-2:2008) has been prepared by Technical Committee C
20、EN/TC 53 “Temporary 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 March 2009, and conflicting national standards shall be withdrawn at
21、the latest by March 2009. Attention is drawn to the possibility that some of 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. The couplers specified in this European Standard are intende
22、d for use in temporary works for example scaffolds erected in accordance with EN 12811-1 and falsework erected in accordance with EN 12812. In accordance with the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European St
23、andard: Austria, Belgium, Bulgaria, 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 the United Kingdo
24、m. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 4 Introduction This is the second of three parts of a standard for couplers. EN 74-1 deals with common types of friction couplers. EN 74-2 deals with other less commo
25、n types of friction couplers and other couplers. EN 74-3 deals with non-adjustable base plates and loose spigot pins. EN 74-2 is not intended to prevent the development of other types of couplers; for example couplers may be manufactured in aluminium or other materials or be designed for use with st
26、eel or aluminium tubes with outside diameters different from those specified in this standard. Whilst such couplers cannot conform to this standard, it is recommended that the principles of this standard are considered in their design and assessment. NOTE In the text of this standard, the term “loos
27、e spigot” is used instead of the “spigot pin” in the title. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 5 1 Scope EN 74-2 specifies: materials; design requirements; specified values for resistances and stiffnesses
28、 which a coupler has to achieve under test; test procedures and assessment; for the following special couplers: screw or wedge half couplers, sleeve couplers with shear studs, right angle reduction couplers and swivel reduction couplers. It gives recommendations for on-going production control. Thes
29、e couplers are for use principally in temporary works Each coupler is able to be fixed to at least one side to one 48,3 mm diameter steel or aluminium tube. For the other side of reduction couplers, this standard specifies requirements for the diameter and wall thickness of tubes. For testing, screw
30、 couplers are tightened with a torque of 50 Nm and wedge couplers are tightened with a 500 g hammer until the jarring blow. Other special half couplers such as half couplers attached by riveting, used mainly for members of prefabricated scaffolds, are outside the scope of this European Standard. NOT
31、E Information on design using special couplers is given in Annex B. 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 referenced doc
32、ument (including any amendments) applies. EN 74-1:2005, Couplers, spigot pins and baseplates for use in falsework and scaffolds Part 1: Couplers for tubes Requirements and test procedures EN 1090-2:2008, Execution of steel structures and aluminium structures Part 2: Technical requirements for steel
33、structures EN 12811-1:2003, Temporary works equipment Part 1: Scaffolds Performance requirements and general design EN 12811-2:2004, Temporary works equipment Part 2: Information on materials EN 12811-3:2002, Temporary works equipment Part 3: Load testing EN ISO 898-1:1999, Mechanical properties of
34、fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs (ISO 898-1:1999) Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 6 3 Terms and definitions For the purposes of this document, the terms an
35、d definitions given in EN 12811-1:2003 and EN 74-1:2005 and the following apply. 3.1 half coupler (HW, HT) coupler which connects a tube of 48,3 mm diameter to another member either by means of welding (HW) or by means of a welded-in threaded element (HT) NOTE See Figures 1 and 2. Key a profile of w
36、elding Figure 1 Half coupler connected by welding (HW) Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 7 Key a profile of welding t thickness of the head of welded-in threaded element 1 welded-in threaded element (bol
37、t, screw, stud, threaded rod) Figure 2 Half coupler for connection with a welded in threaded element (HT) 3.2 sleeve coupler with shear studs (SS) coupler for connecting 48,3 mm tubes end to end by means of a pair of shear studs on each side engaging with two predetermined holes in each tube NOTE Se
38、e Figure 3. Where required, a manufacturer may specify the use of a loose spigot (not shown on Figure 3). Figure 3 Sleeve coupler with shear studs (SS) Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 8 3.3 reduction c
39、oupler (RR and RS) right angle coupler (RR) or swivel coupler (RS) for connecting two tubes with different diameters of which one tube has a diameter of 48,3 mm NOTE See Figure 4. Figure 4 Reduction coupler as swivel coupler (RS) 4 Symbols For the purpose of this European Standard, the following sym
40、bols apply: ck characteristic stiffness of a longitudinal spring; Fsslipping force in kN; Fffailure force in kN; Fppull apart force in kN; Fq share force in kN; MBbending moment in kNm; c(1),MBbending stiffness in kNm/rad; Fs,cspecified value for slipping force in kN; Ff,cspecified value for failure
41、 force in kN; Fp,cspecified value for pull apart force in kN; Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 9 MB,cspecified value for bending moment in kNm; c(1),MB,c specified value for bending stiffness in kNm/rad
42、; displacement in millimetres of the transverse tube under load relative to a tube or solid bar in rotational tests; idisplacement in millimetres of a coupler under load relative to a tube or solid bar; 10indentation in millimetres; P test load in kN; Pindtest load for indentation in kN; Pf,ult ulti
43、mate failure force in kN; Pp,ult ultimate pull apart force in kN; Pq,ult ultimate share force in kN; specified angle of rotation of a coupler in degrees. 5 Types and classification of special couplers The types of special couplers are listed in Table 1. The classification is given in Table 2. Licens
44、ed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 74-2:2008EN 74-2:2008 (E) 10 Table 1 Types of couplers Type Identification Arrangement HW Connection of a tube to a member with a coupler directly welded to the member Half coupler HT Connection of a t
45、ube to a member with a coupler which incorporates a welded in threaded element Sleeve coupler with shear studs SS Tubes connected end to end coaxially using holes in the tubes and studs Right angle RR Tube of 48,3 mm diameter connected to a tube of another diameter at a right angle Reduction coupler
46、 Swivel RS Tube of 48,3 mm diameter connected to a tube of another diameter at any angle Table 2 Classification of couplers Class Type of coupler A B unclassified Half coupler Sleeve coupler with shear studs Reduction coupler 6 Transmissible internal forces, moments and related stiffnesses 6.1 Gener
47、al In general a connection between two members is able to transmit three internal forces and three moments at right angle. There are related stiffnesses. The connection of a tube to another member by a threaded element fixed half coupler (HT) or by weldable half coupler (HW) is designed to transmit
48、three forces. Additionally, a Class B half coupler connected by a welded-in threaded element (HT) is designed to transmit one bending moment and a Class B screw weldable half coupler (HW) is designed to transmit two bending moments as listed in Table 3. A sleeve coupler with shear studs (SS) is desi
49、gned to transmit one force and one bending moment as listed in Table 4. A right angle reduction coupler (RR) is designed to transmit three forces at right angle in three directions as listed in Table 5. A swivel reduction coupler (RS) is designed to transmit one force as listed in Table 6. NOTE The influence of the moments resulting from eccentricities of the connection is considered in the test. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 08/09/2010 02:18, Uncontrolled Copy, (c) BSIBS EN 7
