SIST EN 74-2:2022
(Main)Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 2: Special couplers - Requirements and test procedures
Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 2: Special couplers - Requirements and test procedures
EN 74-2 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 on going 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 standard specifies requirements for the diameter and wall thickness of tubes.
For testing, screw couplers are tightened with a torque of 50 Nm and wedge couplers are tightened with a 500 g hammer until the jarring blow.
Other special half couplers such as half couplers attached by riveting, used mainly for members of prefabricated scaffolds, are outside the scope of this document.
NOTE Information on design using special couplers is given in Annex B.
Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Teil 2: Spezialkupplungen - Anforderungen und Prüfverfahren
EN 74-2 legt
- Werkstoffe,
- baukonstruktive Anforderungen,
- festgelegte Werte für Widerstände und Steifigkeiten, die eine Kupplung bei der Prüfung erreichen muss,
- Versuchsdurchführung und Beurteilung
für die folgenden Spezialkupplungen fest:
- Halbkupplungen, Stoßkupplungen mit Scherbolzen, Normal-Reduzierkupplungen und Dreh-Reduzierkupplungen mit Schraub- oder Keilverschluss.
Sie gibt außerdem Empfehlungen für die laufende Produktionskontrolle.
Diese Kupplungen werden hauptsächlich in temporären Konstruktionen eingesetzt. Jede dieser Kupplungen lässt sich auf jeweils mindestens einer Seite an einem Stahl- oder Aluminiumrohr von 48,3 mm Durchmesser befestigen. Für die jeweils andere Seite von Reduzierkupplungen legt diese Norm Anforderungen an den Durchmesser und die Wanddicke der entsprechenden Rohre fest.
Bei der Prüfung werden Schraubkupplungen mit einem Drehmoment von 50 Nm und Keilkupplungen mit einem 500 g Hammer bis zum Prellschlag angezogen.
Sonstige spezielle Halbkupplungen, wie z. B durch Nieten angebrachte Halbkupplungen, die hauptsächlich für Bauteile vorgefertigter Arbeitsgerüste verwendet werden, liegen nicht im Anwendungsbereich dieses Dokuments.
ANMERKUNG Anhang B enthält Angaben zum Entwurf mit Hilfe von Spezialkupplungen.
Raccords, goujons d’assemblage et semelles pour étaiements et échafaudages - Partie 2 : Raccords spéciaux - Exigences et modes opératoires d’essai
L’EN 74- spécifie :
- les matériaux ;
- les exigences de conception ;
- les valeurs spécifiées de résistance et de rigidité qu’un raccord doit respecter dans le cadre des essais ;
- les modes opératoires d’essai et l’évaluation ;
pour les raccords spéciaux suivants :
- les demi-raccords boulonnés ou à clavette, les raccords de prolongation avec goujons de cisaillement, les raccords réducteurs orthogonaux et à angle variable.
Elle fournit des recommandations relatives au contrôle continu de la production.
Ces raccords sont principalement utilisés dans les structures temporaires de chantiers. Chaque raccord peut être monté sur au moins un tube d’acier ou d’aluminium de 48,3 mm de diamètre. Pour les raccords réducteurs, la présente norme spécifie les exigences de diamètre et d’épaisseur de paroi des tubes.
Pour les essais, les raccords boulonnés sont serrés à un couple de 50 Nm et les raccords à clavette sont serrés à l’aide d’un marteau de 500 g jusqu’au refus.
Les autres demi-raccords spéciaux, tels que les demi-raccords rivetés, utilisés principalement pour les éléments d’échafaudages préfabriqués, ne relèvent pas du domaine d’application du présent document.
NOTE L’Annexe B fournit des informations sur la conception à l’aide de raccords spéciaux.
Spojke, vezne centične spojke in podnožne plošče za delovne in nosilne odre - 2. del: Specialne spojke - Zahteve in preskusni postopki
Standard EN 74-2 določa:
– materiale,
– zahteve glede izvedbe,
– določene vrednosti za odpornost in togost, ki jih mora spojka doseči med preskušanjem,
– preskusne postopke in ocenjevanje
za naslednje specialne spojke:
– vijačne ali klinaste polspojke, objemne spojke s strižnim zatičem, pravokotne redukcijske spojke in vrtljive redukcijske spojke.
Podaja priporočila za nadzor proizvodnje v teku.
Te spojke so namenjene uporabi predvsem pri začasnih delih. Posamezno spojko je mogoče pritrditi na vsaj eno stran cevi iz jekla ali aluminija s premerom 48,3 mm. Za drugo stran redukcijskih spojk ta standard določa zahteve glede premera in debeline sten cevi.
Za namene preskušanja so vijačne spojke zategnjene z navorom 50 Nm, klinaste spojke pa do mejne točke z uporabo kladiva 500 g.
Druge specialne spojke (npr. polspojke, pritrjene s kovičenjem), ki se uporabljajo predvsem za elemente predizdelanih nosilnih odrov, ne spadajo na področje uporabe tega dokumenta.
OPOMBA: Informacije o izvedbi z uporabo specialnih spojk so podane v dodatku B.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 74-2:2022
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
SIST EN 74-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 74-2:2022
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SIST EN 74-2:2022
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.
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SIST EN 74-2:2022
EN 74-2:2022 (E)
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
2
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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
3
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SIST EN 74-2:2022
EN 74-2:2022 (E)
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.
4
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SIST EN 74-2:2022
EN 74-2:2022 (E)
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.
5
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EN 74-2:2022 (E)
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 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 74-1:2022, Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for
tubes - Requirements and test procedures
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 17293, Temporary works equipment - Execution - Requirements for manufacturing
EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws
and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1)
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3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in EN 12811-1:2003 and
EN 74-1:2022 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
half coupler (HW)
coupler which connects a tube of 48,3 mm diameter to another member by means of welding (HW)
Note 1 to entry: See Figure 1.
Key
a profile of welding
Figure 1 — Half coupler connected by welding (HW)
3.1.2
half coupler (HT)
coupler which connects a tube of 48,3 mm diameter to another member by means a welded-in threaded
element (HT)
Note 1 to entry: See Figure 2.
7
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EN 74-2:2022 (E)
Key
a profile of welding
t thickness of the head of welded-in threaded element
1 welded-in threaded element (bolt, screw, stud, threaded rod)
Figure 2 — Half coupler for connection with a welded in threaded element (HT)
3.1.3
sleeve coupler with shear studs (SS)
coupler for connecting 48,3 mm tubes end to end by means of a pair of shear studs on each side engaging
with two predetermined holes in each tube
Note 1 to entry: See Figure 3. Where required, a manufacturer may specify the use of a loose spigot (not shown on
Figure 3).
Figure 3 — Sleeve coupler with shear studs (SS)
8
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3.1.4
reduction coupler (RR)
right angle coupler (RR) for connecting two tubes with different diameters of which one tube has a
diameter of 48,3 mm
3.1.5
reduction coupler (RS)
swivel coupler for connecting two tubes with different diameters of which one tube has a diameter of
48,3 mm
Note 1 to entry: See Figure 4.
Figure 4 — Reduction coupler as swivel coupler (RS)
3.2 Symbols and abbreviations
For the purpose of this document, the following symbols apply:
c characteristic stiffness of a longitudinal spring;
k
F slipping force in kN;
s
F failure force in kN;
f
F pull apart force in kN;
p
F shear force in kN;
q
M cruciform bending moment in kNm;
B,x
M bending moment in kNm;
B,y
c cruciform bending stiffness in kNm/rad;
φi,MB,x
c bending stiffness in kNm/rad;
φi,MB,y
9
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EN 74-2:2022 (E)
F specified value for slipping force in kN;
s,c
F specified value for failure force in kN;
f,c
F specified value for pull apart force in kN;
p,c
M specified value for bending moment in kNm;
B,c
c specified value for bending stiffness in kNm/rad;
φi,MB,c
ν displacement of the transverse tube under load relative to a tube or solid bar in
rotational tests in mm;
Δ displacement of a coupler under load relative to a tube or solid bar in mm;
i
Δ indentation in mm;
10
P test load in kN;
P test load for indentation in kN;
ind
P ultimate failure force in kN;
f,ult
P ultimate pull apart force in kN;
p,ult
P ultimate shear force in kN;
q,ult
M ultimate cruciform bending moment in kNm;
ult,x
ultimate bending moment in kNm;
M
ult,y
φ angle of rotation of a coupler in degrees;
(i) number of test sample.
4 Types and classes of special couplers
4.1 Types of couplers
The types of special couplers are listed in Table 1.
Table 1 — Types of couplers
Type of coupler Identification Arrangement of tubes
Connection of a tube to a member with a coupler
HW
directly welded to the member
a
Half coupler
Connection of a tube to a member with a coupler
HT
which incorporates a welded in threaded element
Sleeve coupler with Tubes connected end to end coaxially using holes in
SS
shear studs the tubes and studs
Tube of 48,3 mm diameter connected to a tube of
Right angle RR
another diameter at a right angle
Reduction
coupler
Tube of 48,3 mm diameter connected to a tube of
Swivel RS
another diameter at any angle
a
All connections other than those specified for HW and HT e.g. riveted connections are not covered by this
document.
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4.2 Classes of Couplers
4.2.1 General
The classification is given in Table 2.
Table 2 — Classes of couplers
Class
Type of coupler Unclassified
A B
Half coupler ∎ ∎ –
Sleeve coupler with shear studs – – ∎
Reduction coupler – – ∎
Classes A and B differ in transmissible internal forces and moments and in values of load bearing capacity
and stiffness.
4.2.2 Transmissible internal forces, moments and related stiffnesses
In general, a connection between two members is able to transmit three internal forces and three
moments at right angles to each other with related stiffness.
The connection of a tube to another member by a threaded element fixed half coupler (HT) or by weldable
half coupler (HW) is designed to transmit three forces. Additionally, a Class B half coupler connected by
a welded-in threaded element (HT) is designed to transmit one bending moment and a Class B screw
weldable half coupler (HW) is designed to transmit two bending moments as listed in Table 3.
A sleeve coupler with shear studs (SS) is designed to transmit one force and one bending moment as
listed in Table 4.
A right angle reduction coupler (RR) is designed to transmit three forces at right angle in three directions
as listed in Table 5.
A swivel reduction coupler (RS) is designed to transmit two forces as listed in Table 6.
NOTE The influence of the moments resulting from eccentricities of the connection is considered in the test.
Table 3 to 6 show the structural parameters which are specified.
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Table 3 — Structural parameters for half couplers (HT and HW)
Class
A B
Structural parameters (see Figure 5)
HW
HW/HT HT
Screw
Wedge coupler
coupler
Slipping force F
∎ ∎ ∎ ∎
s
Failure force F
∎ ∎ ∎ ∎
f
Pull apart force F
∎ ∎ ∎ ∎
p
Force or
Shear force F
∎ ∎ ∎ ∎
moment q
Cruciform bending
– ∎ – –
moment M
B,x
Bending moment M
– ∎ ∎ ∎
B,y
Cruciform bending
– ∎ – –
Connection
stiffness c
φ,MB,x
stiffness
Bending stiffness c
– ∎ ∎ ∎
φ,MB,y
∎ Resistance or stiffness specified in Table 8
Key
x, y direction of principal axis
Figure 5 — Forces and moments for a half coupler
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Table 4 — Structural parameters for a sleeve coupler with shear studs (SS)
Structural parameter (see Figure 6) Unclassified
Failure force F
∎
f
Bending moment M
∎
B
∎ Resistance specified in Table 8.
Figure 6 — Forces and moments for a sleeve coupler with shear studs (SS)
Table 5 — Structural parameters for a right angle reduction coupler type (RR)
Structural parameter
Tube Unclassified
(see Figure 7)
Slipping force F
∎
s,1
1 Diameter 48,3 mm
Failure force F
∎
f,1
Slipping force F
∎
s,2
2 Diameter different from 48,3 mm
Failure force F
∎
f,2
Pull apart force F
∎
p
∎ Resistance specified in Table 8.
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Key
1 tube 1 48,3 mm outside diameter
2 tube 2 of a different outside diameter
Figure 7 — Forces for a right angle reduction coupler
Table 6 — Structural parameters for a swivel reduction coupler type (RS)
Structural parameter
Tube Unclassified
(see Figure 8)
Slipping force F
∎
s,1
1 Diameter 48,3 mm
Failure force F
∎
f,1
Slipping force F
∎
s,2
2 Diameter different from 48,3 mm
Failure force F
∎
f,2
∎ Resistance specified in Table 8.
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Key
1 tube 1 48,3 mm outside diameter
2 tube 2 of a different outside diameter
Figure 8 — Forces for a swivel reduction coupler (RS)
5 Reference tubes and bar for coupler tests
For the purpose of testing, reference tubes and solid bars with a diameter of 48,3 mm shall be in
accordance with EN 74-1.
The tubes used for testing reduction couplers with diameters other than 48,3 mm shall be in accordance
with Table 7, in which the diameters may have a deviation of at least ±0,5 mm.
Table 7 — Steel reference tubes RT for reduction couplers other than 48,3 mm outside
R(n)
diameter
Steel Outside Wall Wall thickness
n Yield strength
reference diameter thickness tolerance
2
mm mm mm N/mm
1 33,7 3,0
2 38,0
3 42,4 3,2
+0,1/−0,2 (including
RT R ≥ 235
R(n) eH
corrosion protection)
4 60,3
5 63,5 4,0
6 76,1 4,5
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6 General requirements
6.1 Materials
All members of couplers shall conform to the requirements specified in EN 74-1:2022, 6.1.
The bodies of half couplers (HW and HT) shall conform to the welding requirements in accordance with
EN 17293. A threaded element shall be weldable and correspond as a minimum to M14 and strength
Class 5.6 specified in EN ISO 898-1.
6.2 Design
6.2.1 All couplers and coupler members shall conform to the requirements specified in EN 74-1:2022,
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.
NOTE The slipping resistance is dependent on the bolt tension. For a given torque this tension is considerably
increased when the integral friction coefficient on the thread is low. This integral friction coefficient is significantly
influenced by the type of corrosion protection and by the lubrication of the bolt and nut connection.
6.2.3 Half couplers may be manufactured from parts of swivel couplers in accordance with EN 74-1
(half swivel couplers) or as a separate member.
For a half coupler (HT), the threaded element for bolting to the other member shall be welded into the
half coupler body with a surrounding line of welding.
The welding procedures shall be carried out in accordance with EN 17293.
NOTE The welding of the body of a half coupler (HW) to the other member is not part of this document.
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.
The distance between the end of a tube and each centre of the hole shall be (32,5 ± 1) mm.
The diameter of the hole shall be (14 ± 0,5) mm.
If required by the manufacturer, a loose spigot shall be used.
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SIST EN 74-2:2022
EN 74-2:2022 (E)
Table 8 — Test parameters and specified values
Specified values
Type of Property
Symbols Clause Test parameter Class
coupler parameter
Unclassified
A B
F 1 ≤ Δ ≤ 2 mm
Slipping force 7.2.2 10,0 kN 15,0 kN –
s,c 2
F P
Failure force 7.2.3 20,0 kN 30,0 kN –
f,c f,ult
Pull apart
F P
7.2.4 20,0 kN 30,0 kN –
p,c p,ult
force
P = 4,7 kN
≤ 1,5 mm – –
ind
Δ
Indentation 7.2.7
10
P = 6,67 kN
– ≤ 1,5 mm –
ind
F P
Half
Shear force 7.2.5 14,0 kN 20,0 kN –
q,c q,ult
coupler
Bending c M /1,65 = 0,48 kNm
– 15,0 kNm/rad –
φ1,MB,y,c B
(HW,HT)
stiffness on
c M = 0,8 kNm
– 6,0 kNm/rad –
steel tube φ2,MB,y,c B
Bending c M /1,65 = 0,48 kNm
– 13,0 kNm/rad –
φ1,MB,y,c B
stiffness on
aluminium
c M = 0,8 kNm
– 5,0 kNm/rad –
φ,2,MB,y,c B
tube
Ultimate
2M
M
bending – 1,6 kNm –
ult,y,c B
moment
Cruciform c M /1,65 = 0,48 kNm
– 15,0 kNm/rad –
φ1,MB,x,c B
7.2.6
bending
stiffness on
c M = 0,8 kNm
– 6,0 kNm/rad –
φ2,MB,x,c B
steel tube
Cruciform c M /1,65 = 0,48 kNm
– 13,0 kNm/rad –
φ1,MB,x,c B
Only for
bending
screw
stiffness on
coupler
c M = 0,8 kNm
– 5,0 kNm/rad –
aluminium φ2,MB,x,c B
(HW)
tube
Ultimate
cruciform
M 2M
– 1,6 kNm –
ult,x,c B
bending
moment
Sleeve F P
Failure force 7.3.1 – – 40,0 kN
f,c f,ult
coupler
Bending
with shear
M M
7.3.2 – – 1,4 kNm
B,c B
moment
studs (SS)
17
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EN 74-2:2022 (E)
Specified values
Type of Property
Symbols Clause Test parameter Class
coupler parameter
Unclassified
A B
Δ ≤ 7 mm
– – 7,0 kN
1
F
Slipping force 7.4.2
s,c
1 ≤ Δ ≤ 2 mm
– – 10,0 kN
2
Right angle
reduction F P
Failure force 7.4.2 – – 20,0 kN
f,c f,ult
coupler
Pull apart
(RR)
F P
7.4.3 – – 20,0 kN
p,c p,ult
force
Δ P = 6,67 kN
Indentation 7.4.4 – – ≤ 1,5 mm
10 ind
Δ ≤ 7 mm
– – 7,0 kN
1
F
Slipping force 7.4.2
s,c
Swivel
1 ≤ Δ ≤ 2 mm
– – 10,0 kN
2
reduction
coupler
F P
Failure force 7.4.2 – – 14,0 kN
f,c f,ult
(RS)
Δ P = 4,7 kN
Indentation 7.4.4 – – ≤ 1,5 mm
10 ind
6.3 Manufacturer’s drawings
For each coupler model, the manufacturer shall record on the drawings sufficient information for
unambiguous identification and as a base for subsequent inspection.
This includes:
a) geometry;
b) dimensions and tolerances;
c) mass with tolerance;
d) material specification for each element of the coupler;
e) type of surface protection of each element of the coupler.
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.
NOTE Annex A gives recommendations for ongoing production control.
When the ongoing production control follows one of the inspection methods set out in Annex A, it can be
assumed that the couplers produced under this regime conform to the requirements of this clause.
6.4.2 When ongoing produc
...
SLOVENSKI STANDARD
oSIST prEN 74-2:2020
01-december-2020
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: prEN 74-2
ICS:
91.220 Gradbena oprema Construction equipment
oSIST prEN 74-2:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 74-2:2020
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oSIST prEN 74-2:2020
DRAFT
EUROPEAN STANDARD
prEN 74-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2020
ICS 91.220 Will supersede 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 draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 53.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 74-2:2020 E
worldwide for CEN national Members.
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols . 9
5 Types and classification of special couplers . 10
6 Transmissible internal forces, moments and related stiffnesses . 11
6.1 General. 11
6.2 Half coupler . 11
6.3 Sleeve coupler with shear studs (SS) . 12
6.4 Reduction coupler . 13
7 Reference tubes/bar for coupler tests . 14
8 General requirements . 15
8.1 Materials . 15
8.2 Design . 15
8.3 Manufacturer’s drawings . 17
8.4 Production control . 17
9 Tests methods and evaluation of results . 18
9.1 General. 18
9.2 Half couplers . 19
9.2.1 General. 19
9.2.2 Slipping force F of a half coupler . 19
s
9.2.3 Failure force F of a half coupler . 21
f
9.2.4 Pull-apart force F of a half coupler . 22
p
9.2.5 Shear force F of a half coupler . 23
q
9.2.6 Stiffnesses and ultimate bending moments of a half coupler . 24
9.2.7 Indentation of a half coupler . 27
9.3 Sleeve couplers with shear studs (SS) . 28
9.3.1 Failure force F of sleeve couplers . 28
f
9.3.2 Bending moment resistance of a sleeve coupler . 29
9.4 Reduction couplers . 31
9.4.1 General. 31
9.4.2 Slipping and failure force of a reduction coupler (RR and RS) . 31
9.4.3 Pull-apart force of a right angle reduction coupler (RR). 31
9.4.4 Indentation (RR and RS) . 31
10 Designation . 31
11 Marking . 32
12 Test report . 32
2
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13 Assessment . 32
14 Product manual . 32
Annex A (informative) Ongoing production control . 34
Annex B (informative) Information about the design of temporary works structures . 36
B.1 General . 36
B.2 Structural design. 36
B.2.1 Stiffnesses and structural systems . 36
B.2.2 Structural systems for half couplers . 37
B.2.3 Characteristic values of resistances for design purposes . 39
B.2.4 Verification of ultimate limit state — Interaction . 39
Bibliography . 41
3
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
European foreword
This document (prEN 74-2:2020) has been prepared by Technical Committee CEN/TC 53 “Temporary
works equipment”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 74-2:2008.
Compared to EN 74-1:2005 the following changes have been made:
1) alignment to the new EN 74-1;
2) requirement for welded half coupler HW class B changed;
3) in addition, editorial changes are made.
The couplers specified in this European standard 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.
4
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
Introduction
This is the second of three parts of a standard for couplers.
This first part, EN 74-1 deals with common types of friction couplers.
The second part, EN 74-2 deals with other less common types of friction couplers and other couplers.
The third part, EN 74-3 deals with non-adjustable base plates and loose spigot pins.
EN 74-2 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 with outside diameters different from those specified in this standard.
Whilst such couplers cannot conform to this standard, it is recommended that the principles of this
standard are considered in their design and assessment.
NOTE In the text of this standard, the term “loose spigot” is used instead of the “spigot pin” in the title.
5
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1 Scope
EN 74-2 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 on-going 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
standard specifies requirements for the diameter and wall thickness of tubes.
For testing, screw couplers are tightened with a torque of 50 Nm and wedge couplers are tightened with
a 500 g hammer until the jarring blow.
Other special half couplers such as half couplers attached by riveting, used mainly for members of
prefabricated scaffolds, are outside the scope of this document.
NOTE Information on design using special couplers is given in Annex B.
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.
prEN 74-1:2020, Couplers, spigot pins and baseplates for use in falsework and scaffolds — Part 1:
Couplers for tubes — Requirements and test procedures
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 17293, Temporary works equipment — Execution — Requirements for manufacturing
EN ISO 898-1:2013, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1:
Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
(ISO 898-1:2013)
6
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12811-1:2003 and
prEN 74-1:2020 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
half coupler (HW, HT)
coupler which connects a tube of 48,3 mm diameter to another member either by means of welding
(HW) or by means of a welded-in threaded element (HT)
Note to entry 1: See Figures 1 and 2
Key
◺a profile of welding
Figure 1 — Half coupler connected by welding (HW)
7
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
Key
◺a profile of welding
t thickness of the head of welded-in threaded element
1 welded-in threaded element (bolt, screw, stud, threaded rod)
Figure 2 — Half coupler for connection with a welded in threaded element (HT)
3.2
sleeve coupler with shear studs (SS)
coupler for connecting 48,3 mm tubes end to end by means of a pair of shear studs on each side
engaging with two predetermined holes in each tube
Note 1 to entry: See Figure 3. Where required, a manufacturer may specify the use of a loose spigot (not shown on
Figure 3).
Figure 3 — Sleeve coupler with shear studs (SS)
8
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3.3
reduction coupler (RR and RS)
right angle coupler (RR) or swivel coupler (RS) for connecting two tubes with different diameters of
which one tube has a diameter of 48,3 mm
Note 1 to entry: See Figure 4.
Figure 4 — Reduction coupler as swivel coupler (RS)
4 Symbols
For the purpose of this document, the following symbols apply:
c characteristic stiffness of a longitudinal spring;
k
F slipping force in kN;
s
F failure force in kN;
f
F pull apart force in kN;
p
F share force in kN;
q
M bending moment in kNm;
B
c bending stiffness in kNm/rad;
φ(1),MB
F specified value for slipping force in kN;
s,c
F specified value for failure force in kN;
f,c
F specified value for pull apart force in kN;
p,c
M specified value for bending moment in kNm;
B,c
c specified value for bending stiffness in kNm/rad;
φ(1),MB,c
9
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
ν displacement in millimetres of the transverse tube under load relative to a tube or solid
bar in rotational tests;
Δ displacement in millimetres of a coupler under load relative to a tube or solid bar;
i
Δ indentation in millimetres;
10
P test load in kN;
P test load for indentation in kN;
ind
P ultimate failure force in kN;
f,ult
P ultimate pull apart force in kN;
p,ult
P ultimate share force in kN;
q,ult
M capacity of a coupler of cruciform ultimate bending moment;
ult
φ specified angle of rotation of a coupler in degrees.
5 Types and classification of special couplers
The types of special couplers are listed in Table 1.
The classification is given in Table 2.
Table 1 — Types of couplers
Type Identification Arrangement
Connection of a tube to a member with a coupler
HW
directly welded to the member
a
Half coupler
Connection of a tube to a member with a coupler
HT
which incorporates a welded in threaded element
Sleeve coupler with Tubes connected end to end coaxially using holes in
SS
shear studs the tubes and studs
Tube of 48,3 mm diameter connected to a tube of
Right angle RR
another diameter at a right angle
Reduction
coupler
Tube of 48,3 mm diameter connected to a tube of
Swivel RS
another diameter at any angle
a
All connections other than those specified for HW and HT e.g. riveted connections are not covered by this
document.
Table 2 — Classification of couplers
Class
Type of coupler unclassified
A B
Half coupler ■ ■ –
Sleeve coupler with shear studs – – ■
■
Reduction coupler – –
10
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6 Transmissible internal forces, moments and related stiffnesses
6.1 General
In general a connection between two members is able to transmit three internal forces and three
moments at right angle. There are related stiffnesses.
The connection of a tube to another member by a threaded element fixed half coupler (HT) or by
weldable half coupler (HW) is designed to transmit three forces. Additionally, a Class B half coupler
connected by a welded-in threaded element (HT) is designed to transmit one bending moment and a
Class B screw weldable half coupler (HW) is designed to transmit two bending moments as listed in
Table 3.
A sleeve coupler with shear studs (SS) is designed to transmit one force and one bending moment as
listed in Table 4.
A right angle reduction coupler (RR) is designed to transmit three forces at right angle in three
directions as listed in Table 5.
A swivel reduction coupler (RS) is designed to transmit one force as listed in Table 6.
NOTE The influence of the moments resulting from eccentricities of the connection is considered in the test.
6.2 Half coupler
Table 3 shows the structural parameters which are specified.
Table 3 — Structural parameters for half couplers (HT and HW)
Class
A B
Structural parameters (see Figure 5)
HW
HW/HT HT
Screw
Wedge coupler
coupler
Slipping force F
■ ■ ■ ■
s
Failure force F
■ ■ ■ ■
f
Pull apart force F
■ ■ ■ ■
p
Force or
moment
Shear force F
■ ■ ■ ■
q
Bending moment M
■
– – –
B,x
Bending moment M
– ■ ■ ■
B,y
Bending stiffness c
– ■ – –
φ,MB,x
Connection
stiffness
Bending stiffness c
■ ■ ■
–
φ,MB,y
■ Structural parameters are specified in Table 8.
11
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Key
x,y direction of principal axis
Figure 5 — Forces and moments for a half coupler
6.3 Sleeve coupler with shear studs (SS)
Table 4 shows which structural parameters are specified.
Table 4 — Structural parameters for a sleeve coupler with shear studs (SS)
Structural parameter (see Figure 6) Unclassified
Failure force F
■
f
Bending moment M
■
B
■ Structural parameters are specified in Table 8.
Figure 6 — Forces and moments for a sleeve coupler with shear studs (SS)
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6.4 Reduction coupler
Tables 5 and 6 show the structural parameters specified.
Table 5 — Structural parameters for a right angle reduction coupler type (RR)
Structural parameter
Tube Unclassified
(see Figure 7)
Slipping force F
■
s,1
1 Diameter 48,3 mm
Failure force F
■
f,1
Slipping force F
■
s,2
2 Diameter different from 48,3 mm
Failure force F
■
f,2
Pull-apart force F
■
p
■ Structural parameters are specified in Table 8.
Key
1 tube 1 48,3 mm outside diameter
2 tube 2 of a different outside diameter
Figure 7 — Forces for a right angle reduction coupler
13
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Table 6 — Structural parameters for a swivel reduction coupler type (RS)
Structural parameter
Tube Unclassified
(see Figure 8)
Slipping force F
■
s,1
1 Diameter 48,3 mm
Failure force F
■
f,1
Slipping force F
■
s,2
2 Diameter different from 48,3 mm
Failure force F
■
f,2
■ Structural parameters are specified in Table 8.
Key
1 tube 1 48,3 mm outside diameter
2 tube 2 of a different outside diameter
Figure 8 — Forces for a swivel reduction coupler (RS)
7 Reference tubes/bar for coupler tests
For the purpose of testing, reference tubes and solid bars with a diameter of 48,3 mm shall be in
accordance with EN 74-1.
The tubes used for testing reduction couplers with diameters other than 48,3 mm shall be in accordance
with Table 7, in which the diameters may have a deviation of ± 0,5 mm.
14
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Table 7 — Steel reference tubes RT for reduction couplers other than 48,3 mm outside
R(n)
diameter
Wall thickness
Steel Outside Wall
n tolerance (including Yield stress
reference diameter thickness
finishing)
2
mm mm mm N/mm
1 33,7 3,0
1 38,0
2 42,4 3,2
+0,1
RT 235 ≤ R
R(n) eH
−0,2
3 60,3
4 63,5 4,0
5 76,1 4,5
8 General requirements
8.1 Materials
All members of couplers shall conform to the requirements specified in prEN 74 −1:2020, 6.1.
The bodies of half couplers (HW and HT) shall conform to the welding requirements in accordance with
EN 17293. A threaded element shall be weldable and correspond as a minimum to M14 and strength
Class 5.6 specified in EN ISO 898-1:2013.
8.2 Design
8.2.1 All couplers and coupler members shall conform to the requirements specified in
prEN 74-1:2020, 6.2.2, 6.2.3 and 6.2.6.
8.2.2 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 achieve at least the specified values in this
standard. Except for indentation, each value evaluated from a set of tests shall be equal to or greater
than the specified value.
NOTE The slipping resistance is dependent on the bolt tension. For a given torque this tension is considerably
increased when the integral friction coefficient on the thread is low. This integral friction coefficient is
significantly influenced by the type of corrosion protection and by the lubrication of the bolt and nut connection.
8.2.3 Half couplers may be manufactured from parts of swivel couplers in accordance with EN 74-1
(half swivel couplers) or as a separate member.
For a half coupler (HT), the threaded element for bolting to the other member shall be welded into the
half coupler body with a surrounding line of welding.
The welding procedures shall be carried out in accordance with EN 17293.
NOTE The welding of the body of a half coupler (HW) to the other member is not part of this document.
8.2.4 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 8.2.2.
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The distance between the end of a tube and each centre of the hole shall be (32,5 ± 1) mm.
The diameter of the hole shall be (14 ± 0,5) mm.
If required by the manufacturer a loose spigot should be used.
Table 8 — Tests parameters and specified values
Specified values
Test
Type Property parameter Test parameter Class
clause
unclassified
A B
Δ ≤ 7 mm
7,0 kN 10,0 kN –
1
Slipping
F
9.2.2
s,c
force
1 ≤ Δ ≤ 2 mm
10,0 kN 15,0 kN –
2
F P
Failure force 9.2.3 20,0 kN 30,0 kN –
f,c f,ult
Pull-apart
F P
9.2.4 20,0 kN 30,0 kN –
p,c p,ult
force
P = 4,7 kN
≤ 1,5 mm – –
ind
Δ
Indentation 9.2.7
10
P = 6,67 kN
– ≤ 1,5 mm –
ind
F P
Shear force 9.2.5 14,0 kN 20,0 kN –
q,c q,ult
Half coupler
c
φ1,MB,
(HW,HT)
M /1,65 = 0,48 kNm
– 15,0 kNm/rad –
B
Bending
y,c
stiffness on
c
steel tube φ2,MB,
M = 0,8 kNm
– 6,0 kNm/rad –
B
y,c
c
φ1,MB,
M /1,65 = 0,48 kNm
Bending
– 13,0 kNm/rad –
B
y,c
stiffness on
aluminium
c
φ,2,MB
M = 0,8 kNm
– 5,0 kNm/rad –
tube
B
,y,c
Ultimate
M 2M
bending – 1,6 kNm –
ult,y,c B
moment
9.2.6
c
φ1,MB,
M /1,65 = 0,48 kNm
– 15,0 kNm/rad –
B
Bending
x,c
stiffness on
c
steel tube φ2,MB,
M = 0,8 kNm
– 6,0 kNm/rad –
B
x,c
Only for c
φ1,MB,
M /1,65 = 0,48 kNm
Bending
– 13,0 kNm/rad –
B
screw
x,c
stiffness on
coupler (HW)
aluminium
c
φ2,MB,
M = 0,8 kNm
– 5,0 kNm/rad –
tube B
x,c
Ultimate
M 2M
bending – 1,6 kNm –
ult,x,c B
moment
F P
Failure force 9.3.1 – – 40,0 kN
Sleeve f,c f,ult
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
Specified values
Test
Type Property parameter Test parameter Class
clause
unclassified
A B
coupler with
Bending
shear studs M M
9.3.2 – – 1,4 kNm
B,c B
moment
(SS)
Δ ≤ 7 mm
– – 7,0 kN
1
Slipping
F
9.4.2
s,c
force
1 ≤ Δ ≤ 2 mm
– – 10,0 kN
2
Right angle
F P
Failure force 9.4.2 – – 20,0 kN
f,c f,ult
reduction
coupler (RR)
Pull apart
F P
9.4.3 – – 20,0 kN
p,c p,ult
force
Δ P = 6,67 kN
Indentation 9.4.4 – – ≤ 1,5 mm
10 ind
Δ ≤ 7 mm
– – 7,0 kN
1
Slipping
F
9.4.2
s,c
force
1 ≤ Δ ≤ 2 mm
Swivel
– – 10,0 kN
2
reduction
F P
Failure force 9.4.2 – – 14,0 kN
coupler (RS)
f,c f,ult
Δ P = 4,7 kN
Indentation 9.4.4 – – ≤ 1,5 mm
10 ind
8.3 Manufacturer’s drawings
For each coupler model, the manufacturer shall record on the drawings sufficient information for
unambiguous identification and as a base for subsequent inspection.
This includes:
a) geometry;
b) dimensions and tolerances;
c) mass with tolerance;
d) material specification for each element of the coupler;
e) type of surface protection of each element of the coupler.
8.4 Production control
8.4.1 An appropriate method of quality control during each production programme shall ensure that
couplers satisfy the performance requirements of this standard and that they conform to the
manufacturer’s drawings.
When the ongoing production control follows one of the inspection methods set out in Annex A, it can
be assumed that the couplers produced under this regime conform to the requirements of this clause.
8.4.2 When ongoing production control procedures differ from those recommended in Annex A, they
should be drawn up by a person competent to do so.
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oSIST prEN 74-2:2020
prEN 74-2:2020 (E)
Although it is not a requirement of this standard, it is recommended that manufacturers submit their
production control procedures periodically to third party inspections.
9 Tests methods and evaluation of results
9.1 General
Basic requirements for testing are given in EN 12811-3.
Requirements for testing shall conform to prEN 74-1:2020, 7.1.2 to 7.1.11.
The minimum number of tests carried out on different types and classes of each coupler shall be in
accordance with Table 9.
Any aspects of the evaluation of tests results where not specified in this standard shall be carried out in
accordance with EN 12811-3.
Table 9 — Minimum number of tests for each coupler type
Number of tests
Type of coupler T
...
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