CEN/TC 53/WG 3 - Tubes and fittings

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.

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.

EN 74-3 specifies for non adjustable base plates and loose spigots to be used with 48,3 mm diameter tubes in scaffolds and falsework:
-   materials;
-   design requirements;
-   test procedure;
-   assessment.
A base plate with a means of limited vertical adjustment, called a "base jack", is dealt with in EN 12811 1.
NOTE   In the text of this standard, the term "loose spigot" is used instead of the "spigot pin" in the title.

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.

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.