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SLOVENSKI STANDARD
01-maj-2022
Nadomešča:
SIST EN 74-2:2008
Spojke, vezne centične spojke in podnožne plošče za delovne in nosilne odre - 2.
del: Specialne spojke - Zahteve in preskusni postopki
Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 2: Special
couplers - Requirements and test procedures
Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Teil 2:
Spezialkupplungen - Anforderungen und Prüfverfahren
Raccords, goujons d’assemblage et semelles pour étaiements et échafaudages - Partie
2 : Raccords spéciaux - Exigences et modes opératoires d’essai
Ta slovenski standard je istoveten z: EN 74-2:2022
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 74-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 91.220 Supersedes EN 74-2:2008
English Version
Couplers, spigot pins and baseplates for use in falsework
and scaffolds - Part 2: Special couplers - Requirements and
test procedures
Raccords, goujons d'assemblage et semelles pour Kupplungen, Zentrierbolzen und Fußplatten für
étaiements et échafaudages - Partie 2 : Raccords Arbeitsgerüste und Traggerüste - Teil 2:
spéciaux - Exigences et modes opératoires d'essai Spezialkupplungen - 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 74-2:2022 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 . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviations . 9
4 Types and classes of special couplers. 10
4.1 Types of couplers . 10
4.2 Classes of Couplers . 11
4.2.1 General. 11
4.2.2 Transmissible internal forces, moments and related stiffnesses . 11
5 Reference tubes and bar for coupler tests . 15
6 General requirements . 16
6.1 Materials . 16
6.2 Design . 16
6.3 Manufacturer’s drawings . 18
6.4 Production control . 18
7 Tests methods and evaluation of results . 19
7.1 General. 19
7.2 Half couplers . 21
7.2.1 General. 21
7.2.2 Slipping force F of a half coupler . 21
s
7.2.3 Failure force F of a half coupler . 22
f
7.2.4 Pull apart force F of a half coupler . 24
p
7.2.5 Shear force F of a half coupler . 25
q
7.2.6 Stiffnesses and bending moments of a half coupler . 26
7.2.7 Indentation of a half coupler . 29
7.3 Sleeve couplers with shear studs (SS) . 30
7.3.1 Failure force F of sleeve couplers . 30
f
7.3.2 Bending moment M of sleeve couplers . 31
B
7.4 Reduction couplers . 33
7.4.1 General. 33
7.4.2 Slipping and failure force of a reduction coupler (RR and RS) . 33
7.4.3 Pull apart force of a right angle reduction coupler (RR) . 33
7.4.4 Indentation (RR and RS) . 33
8 Designation . 33
9 Marking . 34
10 Test report . 34
11 Assessment . 34
12 Product manual . 35
Annex A (informative) Ongoing production control . 36
Annex B (informative) Information about the design of temporary works structures . 38
B.1 General . 38
B.2 Structural design. 38
B.2.1 Stiffnesses and structural systems . 38
B.2.2 Structural systems for components with half couplers . 39
B.2.3 Characteristic values of resistances for design purposes . 41
B.2.4 Verification of ultimate limit state — Interaction . 42
Bibliography . 43
European foreword
This document (EN 74-2:2022) 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 74-2:2008.
Compared to EN 74-2:2008, the following changes have been made:
1) alignment with the new EN 74-1;
2) requirement for welded half coupler HW class B changed;
3) 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 second of three parts of a standard for couplers.
The first part, EN 74-1 covers common types of friction couplers.
This second part, EN 74-2 deals with other less common types couplers.
The third part, EN 74-3 deals with plain base plates and loose spigot pins.
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 with outside diameters different from those specified in this document. 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 specified in this document are intended for use in temporary works, for example, scaffolds
erected in accordance with EN 12811-1 and falsework erected in accordance with EN 12812.
NOTE In the text of this document, the term “loose spigot” is used instead of the “spigot pin” in the title.
1 Scope
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.
2 Normative re
...