Do you know the sign before the scaffolding collapse

Scaffolding collapse is an important problem in construction. Maybe there is a sign to let you know before the collapse. Do you know the sign before the scaffolding collapse?

1. The lateral arch deformation in the lower part of the frame and in the long vertical rods.

2. The scaffolding and scaffolding parts contact parts in the damage.

3. The scaffolding part will shake it when you walking with abnormal sound.