Originally Posted by
Ratchaburi
Now this is the crane involved if you look at the picture there should 15 to 20 ton counter weight behind the boom.
Also where his support arm there should be big 2.4 X 2.4 meter plates on the ground under the arms.
Apart from the reasons already given, I would say another reason why this happened was that the operator set up the crane too close to the edge and the ground gave way underneath the outriggers. Once that happened, the sudden movement at the top of the 50 m. boom would have been a bit hard to arrest.