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Wuchang Shipyard was officially opened to traffic in Hunan Xiangjiang Sanqiji Bridge, which was involved in the construction and welding of steel box girder. The bridge is the world's largest self-anchored suspension bridge with the main span. The total length of the Xiangjiang Sanzhaoji Bridge is 1577 meters. The steel box girder of the main bridge is a large self-anchored suspension bridge with a length of 732 meters. It is made of 81 steel box girders with a main span of 328 meters. Different from the previous practice of constructing bridge anchors on both sides of the land, the two large suspension cables of the self-anchored suspension bridge are directly anchored inside the steel box girder, and the strength requirements of the steel box girder are higher. After undertaking the project, the martial art made bold innovations, setting the first for the first time to use the production line to make the unit parts, and the first time to carry out the precision compensation of the steel box beam manufacturing system.