EN 74-2:2008
(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 defines 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 European Standard.
NOTE Some 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 dieser Norm.
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 2 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 :
demi-raccords boulonnés ou par clavette, raccords de prolongation avec broches travaillant en cisaillement, raccords réducteurs orthogonaux et à angle variable.
Elle émet des recommandations relatives au contrôle de la production en cours.
Ces raccords sont principalement utilisés en tant qu’équipements temporaires de chantiers. Chaque raccord peut être monté au moins sur un tube d’acier ou d’alliage d’aluminium de 48,3 mm de diamètre. Pour les raccords réducteurs, la présente norme définit les exigences de diamètre et d’épaisseur de paroi de tubes.
Pour les essais, les raccords boulonnés sont serrés selon un couple de 50 Nm et les raccords par clavette 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 de la présente norme européenne.
NOTE Certaines informations sur la conception à l’aide de raccords spéciaux figurent en Annexe B.
Spojke, vezne centične spojke in podnožne plošče za delovne in nosilne odre - 2. del: Specialne spojke - Zahteve in preskusni postopki
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Spezialkupplungen - Teil 2: Anforderungen und PrüfverfahrenRaccords, goujons d'assemblage et semelles pour étaiements et échafaudages - Partie 2: Raccords spéciaux - Exigences et modes opératoires d'essaiCouplers, spigot pins and baseplates for use in falsework and scaffolds - Part 2: Special couplers - Requirements and test procedures91.220Gradbena opremaConstruction equipmentICS:Ta slovenski standard je istoveten z:EN 74-2:2008SIST EN 74-2:2008en01-december-2008SIST EN 74-2:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 74-2September 2008ICS 91.220 English VersionCouplers, spigot pins and baseplates for use in falsework andscaffolds - Part 2: Special couplers - Requirements and testproceduresRaccords, goujons d'assemblage et semelles pourétaiements et échafaudages - Partie 2: Raccords spéciaux- Exigences et modes opératoires d'essaiKupplungen, Zentrierbolzen und Fußplatten fürArbeitsgerüste und Traggerüste - Spezialkupplungen - Teil2: Anforderungen und PrüfverfahrenThis European Standard was approved by CEN on 9 August 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 74-2:2008: ESIST EN 74-2:2008
Ongoing production control.33 Annex B (informative)
Information about the design of temporary works structures.35 B.1 General.35 B.2 Structural design.35 Bibliography.41
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 European Standard. NOTE Information on design using special couplers is given in Annex B. 2 Normative references The following referenced documents are indispensable for the application 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 74-1:2005, Couplers, spigot pins and baseplates for use in falsework and scaffolds — Part 1: Couplers for tubes — Requirements and test procedures EN 1090-2:2008, Execution of steel structures and aluminium structures — Part 2: Technical requirements for steel structures 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 898-1:1999, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs (ISO 898-1:1999) SIST EN 74-2:2008
Key
a profile of welding Figure 1 — Half coupler connected by welding (HW) SIST EN 74-2:2008
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 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) SIST EN 74-2:2008
Figure 4 — Reduction coupler as swivel coupler (RS) 4 Symbols For the purpose of this European Standard, the following symbols apply: ck
characteristic stiffness of a longitudinal spring; Fs slipping force in kN; Ff failure force in kN; Fp pull apart force in kN; Fq share force in kN; MB bending moment in kNm; c3(1),MB bending stiffness in kNm/rad; Fs,c specified value for slipping force in kN; Ff,c specified value for failure force in kN; Fp,c specified value for pull apart force in kN; SIST EN 74-2:2008
specified value for bending stiffness in kNm/rad;
displacement in millimetres of the transverse tube under load relative to a tube or solid bar in rotational tests; ûi displacement in millimetres of a coupler under load relative to a tube or solid bar; û10 indentation in millimetres; P test load in kN; Pind test load for indentation in kN; Pf,ult ultimate failure force in kN; Pp,ult ultimate pull apart force in kN; Pq,ult ultimate share force in kN; 3 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. SIST EN 74-2:2008
Table 1 — Types of couplers Type Identification Arrangement HW Connection of a tube to a member with a coupler directly welded to the member
Half coupler HT Connection of a tube to a member with a coupler which incorporates a welded in threaded element Sleeve coupler with shear studs SS Tubes connected end to end coaxially using holes in the tubes and studs
Right angle RR Tube of 48,3 mm diameter connected to a tube of another diameter at a right angle
Reduction coupler Swivel RS Tube of 48,3 mm diameter connected to a tube of another diameter at any angle
Table 2 — Classification of coupl
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