EN1065 Adjustable Props

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The Steel tubes for DIN EN1065 Adjustable Props conforming basically to EN 10025 and modified by cold working may be used provided that

• the modified yield strength conforms to one of the yield strengths given in EN 10025 or

• the process used can be shown to guarantee these values.

• the elongation of the modified steel is not less than 18 %

• the yield strength amounts to 315N/mm2 or 395N/mm2 and

NOTE: Cold working modifies the structural properties by strain hardening.

2.Thickness of Adjustable Prop

For classes B, C, D, and E props the nominal wall thickness of any tube used shall be at least 2,6 mm. 

For class A props the minimum wall thickness shall be not less than 2,3 mm after taking tolerances into account.

For the purposes of assessment, the method of making holes shall be stated on the drawings.

NOTE: The preferred method of forming holes is by drilling (see 9.2.4.1).

It is permissible to either, locally expand the diameter of the tube adjacent and welded to the endplate or, add an additional larger diameter tube adjacent and welded to the endplate to increase the stiffness of the connection (see also 9.2.3.1).

3. WELDING

The welding shall be carried out in accordance with EN 729-2.

All fillet welds produced by the metal arc process shall have a minimum throat thickness of 2,5 mm.

Where alternative means of welding are employed (for example friction, or projection welding), the resulting connection shall have an equal or greater weld strength to that produced by the metal arc process.

4.PIN

 The nominal pin diameter DP shall not be less than 13 mm.

5. Adjustment of the prop by fine adjustment device shall also be possible when the distance between the axis of the prop and a plane wall is only 100 mm.

6.Endplates

  6.1 Endplates shall either be square (SQ) or, for identification purposes, be shaped (SH) in accordance with Figure 4.

      Endplates shall have at least two holes for connection purposes.

      If a central hole (see Figure 1) is required in the endplates it shall have a minimum diameter of 28 mm.

 6.2 Plain endplates shall be made of a material having a minimum yield strength of 235 N/mm 2 and shall have a minimum thickness:

      6 mm for classes A, B, and D props; 8 mm for classes C and E props.
      Profiled endplates shall have a spring stiffness and a bending resistance at least equal to that of plain endplates.

6.3 It shall be possible to draw the following circles on endplates: 110 mm diameter for class A props;
     120 mm diameter for class B, C, D, and E props.
      At corners that would otherwise be sharp the radius shall be 5 mm ≤ r ≤ 10 mm.

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