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1、BRITISH STANDARD BS EN 74-1:2005 Couplers, spigot pins and baseplates for use in falsework and scaffolds Part 1: Couplers for tubes Requirements and test procedures The European Standard EN 74-1:2005 has the status of a British Standard ICS 91.220 ? BS EN 74-1:2005 This British Standard was publishe
2、d under the authority of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006 ISBN 0 580 49096 3 National foreword This 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 It supersedes BS 1139-2.1:1991 which is withdrawn.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 preparat
3、ion 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), which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request
4、to its secretary. Additional information BS 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 in
5、tention of BSI Committee 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 errors The textual errors set out below were discovered when adopting the text of the European st
6、andard. They have been reported 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
7、; present to the responsible 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 pages This document comprises a front cover, a
8、n 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 BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments BS EN 74-1:2005 i In Table B
9、.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-references The British Standards which implement international or European publications referred to in this document may
10、 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 all the necessary provisions of a contract. Users a
11、re responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 74-1 October 2005 ICS 91.220Supersedes EN 74:1988 English Version Couplers, spigot pins and baseplates
12、for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures Raccords, goujons dassemblages et semelles pour taiement et chaffaudages de service - Partie 1: Raccords pour tubes - Exigences de performance et mthodes dessai Kupplungen, Zentrierbolzen und Fuplatten
13、 fr Arbeitsgerste und Traggerste - Teil 1: Rohrkupplungen - Anforderungen und Prfverfahren This 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 European Standard the stat
14、us 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 any CEN member. This European Standard exists in three official versions (English, French, German). A v
15、ersion 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. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Es
16、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES
17、 KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 74-1:2005: E EN 74-1:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope.5 2 Normative references
18、.5 3 Terms, definitions and symbols 5 3.1 Terms and definitions.6 3.2 Symbols and abbreviations6 4 Types and classes of couplers7 4.1 Types of couplers .7 4.2 Classes of couplers7 5 Reference tubes and bar for coupler tests12 6 General requirements.13 6.1 Materials 13 6.2 Design13 6.3 Manufacturers
19、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 Stiffnesses and ultimate moments27 7.5 Indentation (RA,SW,PA) .34 8 Designation .36 9 Marking36 10 Test report.37 11 Evaluation of test results3
20、7 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 EN 74-1:2005 (E) 3 Foreword This European Standard (EN 7
21、4-1:2005) 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, either by publication of an identical text or by endorsement, at the latest by April 2006, and c
22、onflicting 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 requirements for some couplers. The couplers specified in this European Standard are intended for
23、 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 Internal Regulations, the national standards organizations of the following countries are bound t
24、o implement 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 K
25、ingdom. 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, 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 wi
26、th 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 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
27、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 nominal outside diameter. Whilst such couplers cannot comply with this European Standard, it is recommended that the principles of this European Stan
28、dard are considered in their design and assessment. The couplers in this European Standard are intended for use in scaffolds 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
29、 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, sleeve couplers and parallel couplers working by friction: materials; design requirements; strength classes with different structural parameters in
30、cluding values for resistance 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 f
31、ollowing referenced documents 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 testin
32、g Part 1: Method of test at 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
33、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 properties of fasteners Part 2: Nuts with specified proof load value -; Coarse thread (ISO 898-2:1992) EN 12812, Falsework Performance requirements a
34、nd 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 following 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 wh
35、ich 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 bolt 3.1.4 supplementary coupler right angle coupler positioned
36、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 this European Standard, the following symbols apply: Fs slipping
37、 force in kN; Ff failure force in kN; Fp pull apart force in kN; MB bending or cruciform bending moment in kNm; c(i),MB cruciform bending stiffness in kNm/rad; MT rotational moment in kNm; c,MT rotational stiffness in kNm/rad; Fs,c specified value for slipping force in kN; Ff,c specified value for f
38、ailure force in kN; Fp,c specified value for pull apart force in kN; MB,c specified value for bending moment in kNm; c(i),MB,c specified value for cruciform bending stiffness in kNm/rad; MT,c specified value for rotational moment in kNm; c,MT,c specified value for rotational stiffness in kNm/rad; EN
39、 74-1:2005 (E) 7 displacement in millimetres of the transverse tube under load relative to a tube or solid bar in rotational tests; i displacement in millimetres of a coupler under load relative to a tube or solid bar; 10 indentation in millimetres; P test load in kN; Pind test load for indentation
40、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; Mult capacity of a coupler of cruciform bending ultimate moment; ReH yield strength; Rp,0.2 proof stress at elongation of 0.2 %;
41、 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 Identification Arrangement of tubes Right angle coupler RA Crossing at a right angle Swivel coupler SW Crossing at any angle Parallel cou
42、pler 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 Table 2 Classes of couplers Class Type of coupler A B AA BB Right angle coupler Swivel coupler - - Parallel coupler - - Sleeve c
43、oupler 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. Couplers of classes AA and BB, used as single couplers have the same characteristics as couplers of classes A and B respectively, bu
44、t 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, moments and related stiffnesses In general a connection between two tubes is able to transmit three forces and three moments at righ
45、t 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 stiffness may be derived from load displacement curves for slipping forces. EN 74-1:2005 (E) 9 Table 3 Structural parameters for right a
46、ngle 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 or moment (Figure 1) Cruciform bending moment MB* - Rotational stiffness c,MT* - Connection stiffness Cruciform bending stiffness c,MB - Resistance o
47、r 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) Class Structural parameter A B 1 Slipping force Fs (Figure 2) 2 Failure force Ff (Figure 2) Resistance specified Figure 2 F
48、orces 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 for a sleeve coupler 5 Reference tub