1、BRITISH STANDARDBS EN74-1:2005Couplers, spigot pins and baseplates for use in falsework and scaffolds Part 1: Couplers for tubes Requirements and test proceduresThe European Standard EN 74-1:2005 has the status of a British StandardICS 91.220g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g
2、54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 74-1:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006ISBN 0 580 490
3、96 3National forewordThis British Standard is the official English language version of EN 74-1:2005. It supersedes BS 1139-2.1:1991 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/21, Access an
4、d working scaffolds and their components (props, tubes and couplers), which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Additional informationBS EN 74-1:2005 specifies test procedures to establish whether couplers me
5、et with the criteria specified. The characteristic structural parameters for couplers for use in design are not given in BS EN 74-1:2005 but in BS EN 12811-1:2003, Annex C.It is the intention of BSI Committee B/514 that once EN 74-2 and EN 74-3 of EN 74 are finalized, a separate guidance document sh
6、ould be published to facilitate the use of this series of standards in the UK.Textual errorsThe textual errors set out below were discovered when adopting the text of the European standard. They have been reported to the DIN Secretariat in a proposal to amend the text of the European standard.In Tab
7、le 8 and Table 9, in the Clause column, for all references the initial 8 should be replaced by 7.In Table 10, in the NOTE, 7.1 should read 6.1. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chan
8、ge, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, page i, a blank page, the EN title page, pages 2 to 42, an inside back cover and a back cover.The BS
9、I copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsBS EN 74-1:2005iIn Table B.2, column 3, 8.2.1 and 8.2.2 should read 7.2.1 and 7.2.2 respectively.In Table B.2, column 4, BRB should read RB.In the NOTE b
10、elow Table B.2, Table 6 should read Table 7. Cross-referencesThe 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 Correspondence Index”, or by using the “Search”
11、 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 of itself confer immunity from legal obliga
12、tions.blankEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 74-1October 2005ICS 91.220 Supersedes EN 74:1988 English VersionCouplers, spigot pins and baseplates for use in falsework andscaffolds - Part 1: Couplers for tubes - Requirements and testproceduresRaccords, goujons dassemblages et semelles
13、 pourtaiement et chaffaudages de service - Partie 1: Raccordspour tubes - Exigences de performance et mthodesdessaiKupplungen, Zentrierbolzen und Fuplatten frArbeitsgerste und Traggerste - Teil 1: Rohrkupplungen -Anforderungen und PrfverfahrenThis European Standard was approved by CEN on 26 August 2
14、005.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 such nationalstandards may be obtained on
15、 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat h
16、as the same status as the officialversions.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, Slov
17、akia,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 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for
18、 CEN national Members.Ref. No. EN 74-1:2005: EEN 74-1:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Terms, definitions and symbols 5 3.1 Terms and definitions.6 3.2 Symbols and abbreviations6 4 Types and classes of couplers 7 4.1 Types of couplers .7 4.2 Cl
19、asses of couplers 7 5 Reference tubes and bar for coupler tests12 6 General requirements .13 6.1 Materials 13 6.2 Design13 6.3 Manufacturers drawing16 6.4 Production.16 7 Test methods and evaluation of results16 7.1 General 16 7.2 Slipping and failure force .19 7.3 Pull-apart force Fp(RA).26 7.4 Sti
20、ffnesses and ultimate moments 27 7.5 Indentation (RA,SW,PA) .34 8 Designation .36 9 Marking 36 10 Test report .37 11 Evaluation of test results37 12 Assessment.37 13 Product manual.37 Annex A (normative) Whitworth thread size 1/2 X 12 Tpi 38 A.1 Nominal values.38 A.2 Tolerances and limiting dimensio
21、ns after coating .39 Annex B (informative) Ongoing production control.40 Bibliography.42 EN 74-1:2005 (E) 3 Foreword This European Standard (EN 74-1:2005) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat of which is held by DIN. This European Standard s
22、hall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. When published this European Standard supersedes the requirements for coupler
23、s specified in EN 74:1988. There are additional requirements for some couplers. The couplers specified in this European Standard are intended for use in scaffolds erected in accordance with EN 12811-1 and falsework erected in accordance with EN 12812. This European Standard is not mandated at the ti
24、me of publication. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland
25、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 74-1:2005 (E) 4 Introduction This is the first of three parts of a European Standard which supersedes EN 74:1988. This first part, EN 74-1, cove
26、rs common types of friction couplers. The second part, EN 74-2, deals with other less common types of couplers. The third part, EN 74-3, deals with plain base plates and loose spigot pins. Until this part is available the respective clauses of EN 74:1988 remain valid. EN 74-1 defines a set of steel
27、and aluminium reference tubes for the required tests. EN 74-1 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 steel or aluminium tubes other than the normally used 48,3 mm nomi
28、nal outside diameter. Whilst such couplers cannot comply with this European Standard, it is recommended that the principles of this European Standard are considered in their design and assessment.The couplers in this European Standard are intended for use in scaffolds and falsework for connecting 48
29、,3 mm outside diameter steel and aluminium tubes which fulfil in other respects (e.g. material grade, thickness and tolerances) the requirements given in EN 12811-1, EN 12811-2 and EN 12810-1. EN 74-1:2005 (E) 5 1 Scope This European Standard specifies, for right angle couplers, swivel couplers, sle
30、eve couplers and parallel couplers working by friction: materials; design requirements; strength classes with different structural parameters including values for resistance and stiffness; test procedures; assessment; and gives recommendations for ongoing production control. For testing, screw coupl
31、ers are tightened to a torque of 50 Nm and wedge couplers are tightened with a 500 g hammer until the jarring blow. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For und
32、ated references, the latest edition of the referenced document (including any amendments) applies. EN 10002-1, Metallic materials Tensile testing Part 1: Method of test at ambient temperature EN 12811-1:2003, Temporary works equipment Part 1: Scaffolds Performance requirements and general design EN
33、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, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs (ISO 898-1:1999) EN 20898-2, Mechanical prope
34、rties of fasteners Part 2: Nuts with specified proof load value -; Coarse thread (ISO 898-2:1992) EN 12812, Falsework Performance requirements and general design 3 Terms, definitions and symbols For the purposes of this European Standard, the terms and definitions given in EN 12811-1:2003 and the fo
35、llowing apply. EN 74-1:2005 (E) 6 3.1 Terms and definitions 3.1.1 coupler device used for connecting two tubes 3.1.2 wedge coupler coupler in which the clamping force is obtained by tightening a flap around the tube by means of hammering home a wedge 3.1.3 screw coupler coupler in which the clamping
36、 force is obtained by tightening a flap around the tube by means of a nut and a bolt 3.1.4 supplementary coupler right angle coupler positioned touching an identical coupler in order to increase the slip resistance 3.1.5 assessment checking process to establish compliance with the requirements speci
37、fied in this European Standard 3.2 Symbols and abbreviations For the purpose of this European Standard, the following symbols apply: Fs slipping force in kN; Fffailure force in kN; Fppull apart force in kN; MBbending or cruciform bending moment in kNm; c(i),MBcruciform bending stiffness in kNm/rad;
38、MTrotational moment in kNm; c,MTrotational stiffness in kNm/rad; Fs,cspecified value for slipping force in kN; Ff,cspecified value for failure force in kN; Fp,cspecified value for pull apart force in kN; MB,cspecified value for bending moment in kNm; c(i),MB,cspecified value for cruciform bending st
39、iffness in kNm/rad; MT,cspecified value for rotational moment in kNm; c,MT,cspecified value for rotational stiffness in kNm/rad; EN 74-1:2005 (E) 7 displacement in millimetres of the transverse tube under load relative to a tube or solid bar in rotational tests; idisplacement in millimetres of a cou
40、pler under load relative to a tube or solid bar; 10indentation in millimetres; P test load in kN; Pind test load for indentation in kN; specified angle of rotation of a coupler in degrees; Pf,ult load bearing capacity of a coupler at failure; Pp,ult load bearing capacity of a coupler for pull apart;
41、 Mult capacity of a coupler of cruciform bending ultimate moment; ReHyield strength; Rp,0.2 proof stress at elongation of 0.2 %; Rm tensile strength; 4 Types and classes of couplers 4.1 Types of couplers The types of couplers are listed in Table 1. Table 1 Types of couplers Type of coupler Identific
42、ation Arrangement of tubes Right angle coupler RA Crossing at a right angle Swivel coupler SW Crossing at any angle Parallel coupler PA Parallel Sleeve coupler SF End to end coaxially 4.2 Classes of couplers 4.2.1 General The classes for each type of coupler are given in Table 2. EN 74-1:2005 (E) 8
43、Table 2 Classes of couplers Class Type of coupler A B AA BB Right angle coupler Swivel coupler - - Parallel coupler - - Sleeve coupler friction type - - Specified class NOTE Classes A and B differ in transmissible internal forces and moments and in values of load bearing capacity and stiffness. Coup
44、lers of classes AA and BB, used as single couplers have the same characteristics as couplers of classes A and B respectively, but they may also be used to increase slipping capacity if two identical couplers AA+AA or BB+BB are positioned touching each other. 4.2.2 Transmissible internal forces, mome
45、nts and related stiffnesses In general a connection between two tubes is able to transmit three forces and three moments at right angles to each other with related stiffness. Tables 3 to 6 show which structural parameters apply. See Table 8 for values for testing purposes. NOTE Longitudinal stiffnes
46、s may be derived from load displacement curves for slipping forces. EN 74-1:2005 (E) 9 Table 3 Structural parameters for right angle couplers (RA) Class Structural parameters A and AA B and BB Slipping force Fs Rotational moment MT * - Pull apart force Fp Failure force Ff Force ormoment(Figure1) Cru
47、ciform bending moment MB* - Rotational stiffness c,MT* - Connection stiffness Cruciform bending stiffness c,MB- Resistance or stiffness specified * Only for screw couplers Figure 1 Forces and moments for a right angle coupler EN 74-1:2005 (E) 10 Table 4 Structural parameters for swivel couplers (SW)
48、 Class Structural parameter A B 1 Slipping force Fs (Figure 2) 2 Failure force Ff (Figure 2) Resistance specified Figure 2 Forces for a swivel coupler Table 5 Structural parameters for parallel couplers (PA) Class Structural parameter A B 1 Slipping force Fs (Figure 3) 2 Failure force Ff (Figure 3) Resistance specified EN 74-1:2005 (E) 11 Figure 3 Forces for a parallel coupler Table 6 Structural parameters for sleeve couplers (SF) Class Structural parameters A B 1 Slipping force Fs (Figure 4) 2 Bending moment MB (Figure4)- Resistance specified EN 74-1:2005 (E) 12 Figure 4 Forces and moments f
