Core Points - The Jinqi Grand Bridge, a key project of the Wuchang Expressway, has successfully completed its closure, marking a significant milestone in its construction [1] - The bridge is the tallest and largest of its kind in the world, featuring a double-tower, double-cable-stayed design [1][3] Project Details - The Jinqi Grand Bridge is located in the Xiuwen County of Guiyang, Guizhou Province, spanning a V-shaped deep canyon at an altitude of 1300 meters and crossing the Mao Tiao River [3] - The bridge has a total length of 672 meters and is designed with dual two-way lanes, constructed using a steel-concrete composite beam [3] - The main tower of the bridge reaches a height of 300.6 meters, with a vertical drop of over 355 meters from the top to the water surface [3] Technical Challenges and Innovations - The construction faced several technical challenges, including the installation of a 300-meter high connected tower and precise control of the steel beam installation [3] - The project team conducted systematic research on high-performance concrete using machine-made sand and optimized the selection of high-pressure pumping equipment [3] - The introduction of BIM (Building Information Modeling) and intelligent real-time monitoring systems allowed for millimeter-level verticality control during the construction of the main tower [3] Economic and Social Impact - Upon completion, the Wuchang Expressway will enhance the highway network structure in Guiyang, facilitating a 1 to 2-hour traffic circle around the Guiyang metropolitan area [3] - The project is expected to significantly improve transportation convenience and has profound implications for the high-quality economic and social development of the central Guizhou region [3]