Changwon City Korea, a tower crane collapsed falling onto iron work structure below. The article makes it sound as if the operator survived with back injuries. The cab stayed on the top portion of the crane as the crane broke at the cat head to the turntable connection.
The cause of the accident appears to be due to bolt failure. The question that comes to mind is what was the torque applied to the bolt?
What's even more confusing is that the article shows a tension control bolt (typical structural steel bolt, often a A325 bolt, sometimes called a Lejune bolt but that is a name brand like Cresent Wrench is actually an adjustable wrench.) The difficulty is that the translation services online are great tools, but sometimes some detail are lost. If this bolt shown was the one that failed, it's not the correct bolt for the application.
Also note that the date isn't something that I'm certain of. The date format of Korea isn't clear to me.
타워 크레인 붕괴
타워 크레인 붕괴