EN 74-1:2005

Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures

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 including 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.

Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Teil 1: Rohrkupplungen - Anforderungen und Prüfverfahren

Dieses Dokument regelt für Normalkupplungen, Drehkupplungen, Stoßkupplungen und Parallelkupplungen
jeweils mit Reibverschluss:
. Werkstoffe;
. konstruktive Anforderungen;
. Festigkeitsklassen mit verschiedenen konstruktiven Parametern, einschließlich der Werte für Wider-
stände und Steifigkeiten;
. Versuchsdurchführung;
. Bewertung;
und gibt
. Empfehlungen für die laufende Produktionskontrolle.
Für die Versuche werden Schraubkupplungen mit einem Drehmoment von 50 Nm und Keilkupplungen mit
einem 500-g-Hammer bis zum Prellschlag angezogen.

Raccords, goujons d'assemblage et semelles pour étaiements et échafaudages - Partie 1: Raccords de tubes - Exigences et modes opératoires d'essai

Cette Norme européenne spécifie les points suivants pour les raccords orthogonaux, les raccords à angle variable, les raccords de prolongation et les raccords parallèles travaillant par frottement :
-   les matériaux ;
-   les exigences de conception ;
-   les classes de résistance, avec différents paramètres de structure, y compris les valeurs spécifiées pour la résistance et la rigidité qu’un raccord doit avoir ;
-   les modes opératoires d’essai ;
-   l’évaluation ;
et donne
-   les recommandations relatives au contrôle de la production en cours.
Pour les essais, les raccords boulonnés sont serrés avec un couple de 50 Nm et les raccords par clavette à l’aide d’un marteau de 500 g jusqu’au refus.

Spojke, vezne centične spojke in podnožne plošče za delovne in nosilne odre – 1. del: Cevne spojke – Zahteve in postopki preskušanja

General Information

• Status: Withdrawn
• Publication Date: 04-Oct-2005
• Withdrawal Date: 29-Mar-2022
• ICS: 91.220 - Construction equipment
• Technical Committee: CEN/TC 53 - Temporary works equipment
• Drafting Committee: CEN/TC 53/WG 3 - Tubes and fittings
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 30-Mar-2022
• Ref Project: SIST EN 74-1:2006 - Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures

Relations

• Replaces: EN 74:1988 - Couplers, loose spigots and base-plates for use in working scaffolds and falsework made of steel tubes - Requirements and test procedures
• Effective Date: 22-Dec-2008
• Replaced By: EN 74-1:2022 - Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures
• Effective Date: 06-Apr-2022
• Child: EN 74-3:2007 - Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 3: Plain base plates and spigot pins - Requirements and test procedures
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2006
1DGRPHãþD
SIST EN 74:2000
6SRMNHYH]QHFHQWLþQHVSRMNHLQSRGQRåQHSORãþH]DGHORYQHLQQRVLOQHRGUH±
GHO&HYQHVSRMNH±=DKWHYHLQSRVWRSNLSUHVNXãDQMD
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 74-1:2005
ICS:
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 74-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 91.220 Supersedes EN 74:1988
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'assemblages et semelles pour Kupplungen, Zentrierbolzen und Fußplatten für
étaiement et échaffaudages de service - Partie 1: Raccords Arbeitsgerüste und Traggerüste - Teil 1: Rohrkupplungen -
pour tubes - Exigences de performance et méthodes Anforderungen und Prüfverfahren
d'essai
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 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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of 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 Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 74-1:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction.4
1 Scope .5
2 Normative references .5
3 Terms, definitions and symbols .5
3.1 Terms and definitions.6
3.2 Symbols and abbreviations.6
4 Types and classes of couplers .7
4.1 Types of couplers .7
4.2 Classes of couplers .7
5 Reference tubes and bar for coupler tests.12
6 General requirements .13
6.1 Materials .13
6.2 Design.13
6.3 Manufacturer's drawing.16
6.4 Production.16
7 Test methods and evaluation of results.16
7.1 General .16
7.2 Slipping and failure force .19
7.3 Pull-apart force F (RA).26
p
7.4 Stiffnesses and ultimate moments .27
7.5 Indentation (RA,SW,PA) .34
8 Designation .36
9 Marking .36
10 Test report .37
11 Evaluation of test results.37
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

Foreword
This European Standard (EN 74-1:2005) 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 conflicting 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 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 to 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 Kingdom.
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 with 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 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 Standard 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 given in EN 12811-1, EN 12811-2 and EN 12810-1.
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 including 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 following 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 testing — 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 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 and 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.
3.1 Terms and definitions
3.1.1
coupler
device used for connecting two tubes
3.1.2
wedge coupler
coupler in which 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 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:
 F slipping force in kN;
s
 F failure force in kN;
f
 F pull apart force in kN;
p
 M bending or cruciform bending moment in kNm;
B
 c cruciform bending stiffness in kNm/rad;
ϕ(i),MB
 M rotational moment in kNm;
T
 c rotational stiffness in kNm/rad;
ϕ,MT
 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 cruciform bending stiffness in kNm/rad;
ϕ(i),MB,c
 M specified value for rotational moment in kNm;
T,c
 c specified value for rotational stiffness in kNm/rad;
ϕ,MT,c
 ν displacement in millimetres of the transverse tube under load relative to a tube or solid bar in
rotational tests;
 ∆  displacement in millimetres of a coupler under load relative to a tube or solid bar;
i
 ∆ indentation in millimetres;
 P test load in kN;
 P test load for indentation in kN;
ind
 ϕ specified angle of rotation of a coupler in degrees;
 P load bearing capacity of a coupler at failure;
f,ult
P load bearing capacity of a coupler for pull apart;

p,ult
 M capacity of a coupler of cruciform bending ultimate moment;
ult
 R yield strength;
eH
 R proof stress at elongation of 0.2 %;
p,0.2
 R tensile strength;
m
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 coupler PA Parallel
Sleeve coupler SF End
...