The following is a quote from the story and is noted as a quote from the investigation. "The gap of defective high-bolts holding the crane foundation was due to the presence of nonmetallic inclusions in the metal high-strength bolts and inconsistencies in the mechanical properties of the requirements in the production of works in accordance with passport data, which led to the fall of a crane" The inclusions reminds me of a story from Cranes Today where Felix Weinstein warned about poor quality steel in tower cranes. I have in fact found poor quality steel in a mast section myself, delamination. The Chinese are not known for taking the extra steps to ensure safety and quality and I would never recommend a Chinese crane at any price. Even if you have some that are reputable, how do you vet one over the other?
I wish that we could get more of these stories on the actual cause of accidents. Bolts for towers could be replaced, behaviors could change, and 6 people wouldn't be "affected".
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