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Shady operators and bad oversights, without stringent regulations.
This is the sixth major bridge collapse in China since July 2011, the agency said.
BBC News - Three dead in newly-built Chinese bridge collapse
From the photos released so far I don't see any evidence of construction or material deficiencies. Which implies it's a design flaw. But that doesn't make sense, either - this isn't a unique piece of engineering. So there's not enough information to make a determination yet.
another word is , one reasons:
first: 4 overloaded trucks parked together at the same side of the bridge at the same time to avoid detection, totle 500tons on one short side,
The designed load capacity for the one-side is 50 tons, that means one tank can pass from one side of the bridge without any other car passing the other side to balance, but 4 big overloaded truchs parked tegether at the same side, let the concentrated force 500 tons at one side point, about 8 times of the designed force, let the bridge rollover
the face of the collapsed bridge have no one crackle and deform, Overall rollover
Safety supervision departments take part in to find whether there is a design flaw
OMG, if this was the case, the designer of the bridge should be the one to get to face the firing-squad and every bridges that were handled by him should be re-studied, re-designed and even re-constructed again.