Group 1 - The Chang-Jiu High-Speed Railway's Longxing Bridge has successfully completed the welding of its last segment, marking a significant milestone in its construction [1] - The Longxing Bridge spans 19 kilometers and integrates three transportation modes: high-speed rail, urban expressway, and main urban road [1] - The Chang-Jiu High-Speed Railway is a crucial part of China's medium- and long-term railway network plan, specifically the "Eight Vertical and Eight Horizontal" high-speed rail corridors [1] Group 2 - Upon completion, the railway will enhance the connectivity of the Yangtze River middle reaches urban agglomeration and surrounding city clusters, improving regional transportation infrastructure [1]

Core Viewpoint - The completion of the Longxing Bridge, a key project of the Chang-Jiu High-speed Railway, marks a significant achievement in engineering, setting six world records and enhancing transportation capacity in Nanchang [1][2]. Group 1: Project Overview - The Longxing Bridge spans 19 kilometers and integrates three transportation modes: high-speed rail, urban expressway, and main urban road [1]. - The bridge's main span of 320 meters and a design speed of 350 kilometers per hour make it a unique engineering feat [1]. Group 2: Engineering Techniques - The construction utilized a "first side span, then middle span" technique, ensuring precise alignment during the assembly of the steel beams [1]. - The bridge features innovative designs, including the world's largest diameter stay cables and the first use of elastic restraint supports in a cable-stayed bridge [1]. Group 3: Economic and Regional Impact - The completion of the bridge will significantly enhance Nanchang's cross-river traffic capacity [2]. - The Chang-Jiu High-speed Railway is a crucial part of China's national railway network, improving connectivity among key urban clusters and supporting regional economic development [2].