BS EN 74-2:2022 – TC 2023
$246.62
Tracked Changes. Couplers, spigot pins and baseplates for use in falsework and scaffolds – Special couplers. Requirements and test procedures
| Published By | Publication Date | Number of Pages |
| BSI | 2023 | 106 |
This document specifies: — materials; — design requirements; — specified values for resistances and stiffnesses 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 ongoing production control. These 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 document specifies requirements for the diameter and wall thickness of tubes. Other special half couplers such as half couplers attached by riveting, used mainly for prefabricated members of scaffolds, are outside the scope of this document. NOTE Information on design using special couplers is given in Annex B.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | 30462669 |
| 60 | A-30424616 |
| 61 | undefined |
| 67 | 1 Scope 2 Normative references |
| 68 | 3 Terms, definitions and symbols 3.1 Terms and definitions |
| 70 | 3.2 Symbols and abbreviations |
| 71 | 4 Types and classes of special couplers 4.1 Types of couplers |
| 72 | 4.2 Classes of Couplers 4.2.1 General 4.2.2 Transmissible internal forces, moments and related stiffnesses |
| 76 | 5 Reference tubes and bar for coupler tests |
| 77 | 6 General requirements 6.1 Materials 6.2 Design 6.2.1 All couplers and coupler members shall conform to the requirements specified in EN 741:2022, 6.2.2, 6.2.3 and 6.2.6. 6.2.2 A coupler of a specified type shall conform to all requirements specified in Table 8. It means for any structural parameter that the evaluated test results shall be equal or exceed the specified values in this document except for indentation. 6.2.3 Half couplers may be manufactured from parts of swivel couplers in accordance with EN 741 (half swivel couplers) or as a separate member. 6.2.4 Sleeve couplers with shear studs shall be able to connect tubes with holes in accordance with the dimensions given below and to conform to the requirements given in 6.2.2. |
| 79 | 6.3 Manufacturer’s drawings 6.4 Production control 6.4.1 An appropriate method of quality control during a production programme shall ensure that couplers satisfy the performance requirements of this document and that they comply with the manufacturer’s drawings. 6.4.2 When ongoing production control procedures differ from those recommended in Annex A, they should be drawn up by a person competent to do so. |
| 80 | 7 Tests methods and evaluation of results 7.1 General |
| 82 | 7.2 Half couplers 7.2.1 General 7.2.2 Slipping force Fs of a half coupler 7.2.2.1 Purpose of test 7.2.2.2 Test arrangement |
| 83 | 7.2.2.3 Requirements for initial load 7.2.2.4 Test procedure 7.2.2.5 Evaluation of test results 7.2.3 Failure force Ff of a half coupler 7.2.3.1 Purpose of test 7.2.3.2 Test arrangement |
| 84 | 7.2.3.3 Test procedure 7.2.3.4 Evaluation of test results |
| 85 | 7.2.4 Pull apart force Fp of a half coupler 7.2.4.1 Purpose of test 7.2.4.2 Test arrangement 7.2.4.3 Test procedure |
| 86 | 7.2.4.4 Evaluation of test results 7.2.5 Shear force Fq of a half coupler 7.2.5.1 Purpose of test 7.2.5.2 Test arrangement 7.2.5.3 Test procedure |
| 87 | 7.2.5.4 Evaluation of test results 7.2.6 Stiffnesses and bending moments of a half coupler 7.2.6.1 Purpose of test 7.2.6.2 Test arrangements |
| 89 | 7.2.6.3 Test procedure 7.2.6.4 Evaluation of test results |
| 90 | 7.2.7 Indentation of a half coupler 7.2.7.1 Purpose of test 7.2.7.2 Test arrangement |
| 91 | 7.2.7.3 Test procedure 7.2.7.4 Evaluation of test results 7.3 Sleeve couplers with shear studs (SS) 7.3.1 Failure force Ff of sleeve couplers 7.3.1.1 Purpose of test 7.3.1.2 Test arrangement |
| 92 | 7.3.1.3 Test procedure 7.3.1.4 Evaluation of test results 7.3.2 Bending moment MB of sleeve couplers 7.3.2.1 Purpose of test 7.3.2.2 Test arrangement |
| 93 | 7.3.2.3 Test procedure 7.3.2.4 Evaluation of test results |
| 94 | 7.4 Reduction couplers 7.4.1 General 7.4.2 Slipping and failure force of a reduction coupler (RR and RS) 7.4.3 Pull apart force of a right angle reduction coupler (RR) 7.4.4 Indentation (RR and RS) 8 Designation |
| 95 | 9 Marking 10 Test report 11 Assessment |
| 96 | 12 Product manual |
| 97 | Annex A (informative)Ongoing production control |
| 99 | Annex B (informative)Information about the design of temporary works structures B.1 General B.2 Structural design B.2.1 Stiffnesses and structural systems |
| 100 | B.2.2 Structural systems for components with half couplers |
| 102 | B.2.3 Characteristic values of resistances for design purposes |
| 103 | B.2.4 Verification of ultimate limit state — Interaction |
