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The main load-bearing structure of the bridge is made of steel, namely steel structure bridges and steel bridges. Prefabricated steel bridges have been widely used around the world. The main design concept is to assemble the minimum number of unit components into a prefabricated steel bridge that can bear various loads and spans, and only requires transportation by medium-sized trucks. In special cases, it can be built entirely by manpower. The beam and leg or pier (platform) body form a rigid connection. The structural forms can be divided into portal steel frame bridges, inclined leg steel frame bridges, T-shaped steel frame bridges, and continuous steel frame bridges.