I recently came across CFA Guidance: Anchorage Systems for scaffolding "NASC TG4:11". On page 13 it gives some interesting food for thought.
It states Nylon anchors should be tested to 3 times the working load but the interesting bit is other statement "all anchor types other than Nylon shall be loaded in tension to a load of 2 times the working load.
In addition to this TG20:13, 4.2.3.4; Table 4.4 page 97 from EN 12811 states Cf = Aerodynamic force coefficient 1.30 which is up from 0.7 from TG20:08.
My understanding from this is all sheeted scaffolds since TG20:13 tie loads are to be significantly higher than before. If we are now to add a safety factor of 2 to this then it makes the guidance given earlier on in the code of maximum 16 square meters per tie all most impossible to achieve in practice as the loads to be tested would be more than Heavy duty ties, not to mention the concern for the facade of the building or structure to be able to take the applied horizontal point loads which would in effect work out to be more than suction.
I am waiting to hear from manufacturers such as Apollo to hear what they recommend as I have read some literature that they recommend a minimum safety factor of 1.9.
What do others think or am I going mad?
It states Nylon anchors should be tested to 3 times the working load but the interesting bit is other statement "all anchor types other than Nylon shall be loaded in tension to a load of 2 times the working load.
In addition to this TG20:13, 4.2.3.4; Table 4.4 page 97 from EN 12811 states Cf = Aerodynamic force coefficient 1.30 which is up from 0.7 from TG20:08.
My understanding from this is all sheeted scaffolds since TG20:13 tie loads are to be significantly higher than before. If we are now to add a safety factor of 2 to this then it makes the guidance given earlier on in the code of maximum 16 square meters per tie all most impossible to achieve in practice as the loads to be tested would be more than Heavy duty ties, not to mention the concern for the facade of the building or structure to be able to take the applied horizontal point loads which would in effect work out to be more than suction.
I am waiting to hear from manufacturers such as Apollo to hear what they recommend as I have read some literature that they recommend a minimum safety factor of 1.9.
What do others think or am I going mad?