The exclusive data provided by the accident investigation team to reporters showed that the approved load capacity of the two overloaded trucks was only about 30 tons, but the first truck actually loaded 7 rolls of steel, with a total weight of 158 tons and an overload of 394%. The second car actually loaded six steel coils, with a total weight of about 160 tons and an overload of 455%. When designing the bridge, the actual load of two vehicles far exceeds the maximum value of 55 tons per vehicle. After the accident, the team members of Wei Bing, a professor from Zhejiang University of Technology, arrived at the scene immediately. The cylindrical hot-rolled steel coil they shot at the scene is basic steel, weighing 28 tons.
According to Peng's preliminary analysis, the accident bridge is a single-column pier bridge, with two lateral bearings at the end pier and only one bearing at the middle pier. This kind of bridge is most afraid of "overload and unbalanced load", just like a heavy person sitting on the boat. If he sits on the outermost side, the boat can easily turn over here.
The single-column pier at the accident site has only one support, and the end pier of the accident bridge has two supports, but the box girder and pier are not fixedly connected. The final technical analysis report of the expert investigation team has not announced the exact cause of the accident, but both preliminary investigation and expert analysis pointed out that the transport vehicle was overloaded.