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、54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIBS EN 74-1:2005This British Standard was published under the author
3、ity of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006ISBN 0 580 49096 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 It supersedes BS 1139-2.1:1991 which is withdrawn.The UK participation in its preparation was entrusted by T
4、echnical Committee B/514, Access and support equipment, to Subcommittee B/514/21, Access and 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.Addit
5、ional informationBS EN 74-1:2005 specifies test procedures to establish whether couplers meet 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
6、B/514 that once EN 74-2 and EN 74-3 of EN 74 are finalized, a separate guidance document should 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 repo
7、rted to the DIN Secretariat in a proposal to amend the text of the European standard.In Table 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
8、international/European committee any enquiries on the interpretation, or proposals for change, 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
9、 blank page, the EN title page, pages 2 to 42, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 200
10、6, Uncontrolled Copy, (c) BSIBS 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 below Table B.2, Table 6 should read Table 7. Cross-referencesThe British Standards which implement international or Eu
11、ropean 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” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include
12、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 obligations.Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIblankLicensed Copy: W
13、ang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEUROPEAN 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 - Requireme
14、nts and testproceduresRaccords, goujons dassemblages et semelles 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 Prfve
15、rfahrenThis European Standard was approved by CEN on 26 August 2005.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
16、 references concerning such nationalstandards may be obtained on 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
17、 into its own language and notified to the Central Secretariat has 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
18、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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 2005 CEN All rights of
19、 exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 74-1:2005: ELicensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 74-1:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Te
20、rms, 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 Classes 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 draw
21、ing16 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 Stiffnesses 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
22、 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 dimensions after coating .39 Annex B (informative) Ongoing production control.40 Bibliography.42 Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:
23、00 2006, Uncontrolled Copy, (c) BSIEN 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 shall be given the status of a national standard, eithe
24、r 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 couplers specified in EN 74:1988. There are additional requir
25、ements 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 time of publication. According to the CEN/CENELEC Intern
26、al 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, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherl
27、ands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 74-1:2005 (E) 4 Introduction This is the first of three parts of a European Standard which supersedes EN 74
28、:1988. This first part, EN 74-1, covers 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 v
29、alid. EN 74-1 defines a set of steel 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 othe
30、r than the normally used 48,3 mm nominal 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 scaf
31、folds and falsework for connecting 48,3 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. Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncon
32、trolled Copy, (c) BSIEN 74-1:2005 (E) 5 1 Scope This European Standard specifies, for right angle couplers, swivel couplers, sleeve couplers and parallel couplers working by friction: materials; design requirements; strength classes with different structural parameters including values for resistanc
33、e and stiffness; test procedures; assessment; and gives recommendations for ongoing production control. For testing, screw couplers 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 document
34、s are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated 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
35、ambient temperature 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, Mechanical properties
36、 of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs (ISO 898-1:1999) EN 20898-2, Mechanical properties 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, d
37、efinitions and symbols For the purposes of this European Standard, the terms and definitions given in EN 12811-1:2003 and the following apply. Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 74-1:2005 (E) 6 3.1 Terms and definitions 3.1.1 coupler device
38、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 force is obtained by tightening a flap around the tube by means of a nut and a b
39、olt 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 specified in this European Standard 3.2 Symbols and abbreviations For the purpose of t
40、his 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; MTrotational moment in kNm; c,MTrotational stiffness in kNm/rad; Fs,cspecified va
41、lue 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 stiffness in kNm/rad; MT,cspecified value for rotational moment in kNm; c,MT,cspeci
42、fied value for rotational stiffness in kNm/rad; Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 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 millimetre
43、s of a coupler 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 p
44、ull apart; 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
45、 Identification 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. Licensed
46、Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 74-1:2005 (E) 8 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
47、 transmissible internal forces and moments and in values of load bearing capacity and stiffness. Couplers 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
48、couplers AA+AA or BB+BB are positioned touching each other. 4.2.2 Transmissible internal forces, moments 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
49、 structural parameters apply. See Table 8 for values for testing purposes. NOTE Longitudinal stiffness may be derived from load displacement curves for slipping forces. Licensed Copy: Wang Bin, na, Thu Nov 02 07:24:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 74-1:2005 (E) 9 Table 3 Structural parameters for right angle couplers (RA) Class Structural parameters A and AA
