EN 74-1:2022

SLOVENSKI STANDARD
01-maj-2022
Nadomešča:
SIST EN 74-1:2006
Spojke, vezne centične spojke in podnožne plošče za delovne in nosilne odre - 1.
del: Cevne spojke - Zahteve in preskusni postopki
Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1:
Couplers for tubes - Requirements and test procedures
Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Teil 1:
Rohrkupplungen - Anforderungen und Prüfverfahren
Raccords, goujons d’assemblage et semelles pour étaiements et échafaudages - Partie
1 : Raccords de tubes - Exigences et modes opératoires d’essai
Ta slovenski standard je istoveten z: EN 74-1:2022
ICS:
21.120.20 Sklopke Couplings
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 74-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 91.220 Supersedes EN 74-1:2005
English Version
Couplers, spigot pins and baseplates for use in falsework
and scaffolds - Part 1: Couplers for tubes - Requirements
and test procedures
Raccords, goujons d'assemblage et semelles pour Kupplungen, Zentrierbolzen und Fußplatten für
étaiements et échafaudages - Partie 1 : Raccords de Arbeitsgerüste und Traggerüste - Teil 1:
tubes - Exigences et modes opératoires d'essai Rohrkupplungen - Anforderungen und Prüfverfahren
This European Standard was approved by CEN on 14 February 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status 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 CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 74-1:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 7
3.2 Symbols and abbreviations . 8
4 Types and classes of couplers . 9
4.1 Types of couplers . 9
4.2 Classes of couplers . 9
4.2.1 General. 9
4.2.2 Transmissible internal forces, moments and related stiffnesses . 10
5 Reference tubes and bar for coupler tests . 13
6 General requirements . 13
6.1 Materials . 13
6.2 Design . 14
6.3 Manufacturer’s drawings . 18
6.4 Production control . 18
7 Test methods and evaluation of results . 18
7.1 General. 18
7.2 Slipping and failure force . 22
7.2.1 Slipping force F (RA,SW,PA,SF) . 22
s
7.2.2 Failure force F (RA,SW,PA) . 26
f
7.3 Pull apart force F (RA) . 29
p
7.3.1 Purpose of test . 29
7.3.2 Test arrangement . 29
7.3.3 Test procedure . 29
7.3.4 Evaluation of test results . 29
7.4 Stiffnesses and moments . 30
7.4.1 Cruciform bending stiffness c and c and cruciform bending moment M (RA) 30
φ1,MB φ2,MB B
7.4.2 Rotational moment M and stiffness c (RA) . 34
T φ,MT
7.4.3 Bending moment M (SF) . 36
B
7.5 Indentation (RA,SW,PA) . 38
7.5.1 Purpose of test . 38
7.5.2 Test arrangement . 38
7.5.3 Test procedure . 39
7.5.4 Evaluation of test results . 40
8 Designation . 40
9 Marking . 40
10 Test report . 41
11 Evaluation of test results . 41
12 Assessment . 41
13 Product manual . 41
Annex A (normative) Whitworth thread size 1/2 x 12 Tpi . 42
A.1 Nominal values . 42
A.2 Tolerances and limiting dimensions after coating . 43
Annex B (informative) Ongoing production control . 44
Bibliography . 46
European foreword
This document (EN 74-1:2022) 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 September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 74-1:2005.
Compared to EN 74-1:2005, the following changes have been made:
1) reference tubes with the specified yield strengths are not procurable, therefore, these requirements
are changed;
2) new test conditions are specified;
3) the requirements for the bending moment of sleeve couplers are changed;
4) in addition, editorial changes are made.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This is the first of three parts of a standard for couplers.
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.
This document defines a set of steel and aluminium reference tubes for the required tests.
This document is not intended to prevent the development of other types of couplers. For example,
couplers can be manufactured in aluminium alloys 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 document, it is recommended that the principles of this document are considered
in their design and assessment.
The couplers in this document 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 given in EN 12811-1, EN 12811-2 and EN 12810-1.
1 Scope
This document 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 resistance and stiffness;
— test procedures;
— assessment;
and gives:
— recommendations for ongoing production control.
These couplers are intended for use in temporary works equipment for example in scaffolds erected in
accordance with EN 12811-1 and falsework erected in accordance with EN 12812.

2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12811-1, Temporary works equipment - Part 1: Sc
...