Group 1 - The construction of the Chizhou Yangtze River Road-Rail Bridge is accelerating, connecting Chizhou and Tongling, and is designed to integrate road, intercity rail, and urban rail transit [2] - The bridge is expected to play a significant role in implementing the Yangtze River Economic Belt development strategy, enhancing infrastructure in the Wanjiang area, optimizing river crossing channel layout, and promoting integrated development in the Yangtze River Delta [2]

Core Viewpoint - The completion of the main tower 4 of the Chizhou Yangtze River Bridge marks a significant milestone in the project's construction, indicating progress towards its completion [1] Group 1: Project Details - The main tower 4 of the bridge stands at a height of 272.7 meters, equivalent to 83 stories [1] - The design features pure white towers and steel beams, giving it an aesthetic appeal likened to a "sky bridge" [1] - This is the first of the two main towers to be completed, allowing the project to transition to the next phase, which includes the installation of stay cables [1] Group 2: Significance - Once completed, the bridge will become the sixth rail-road bridge crossing the Yangtze River in Anhui province [1]

Core Viewpoint - The successful installation of the first steel truss beam for the Chizhou Yangtze River Bridge marks the commencement of the main bridge's upper structure construction phase, which is significant for enhancing transportation infrastructure in Anhui Province and integrating into the Yangtze River Delta development [1][2]. Group 1: Project Overview - The Chizhou Yangtze River Bridge connects Tongling City and Chizhou City in Anhui Province, with a total length of 3108.5 meters, featuring a six-lane expressway on the upper level and a two-line high-speed railway on the lower level, along with two reserved intercity rail lines [1]. - The main bridge spans 1768 meters and utilizes a double-layer steel truss cable-stayed design with a main span of 812 meters, comprising 69 segments with a total weight of approximately 91449 tons, equivalent to the weight of 3000 adult Asian elephants [1]. Group 2: Installation Process - The steel beam segments are pre-assembled to a millimeter level in the workshop before being shipped to the construction site for installation using an 1800-ton bridge crane [2]. - The first installed steel truss beam measures 22 meters in length, 36.3 meters in width, 15.5 meters in height, and weighs 1281 tons [2]. - The project emphasizes safety during high-altitude heavy lifting, with comprehensive risk identification and monitoring of weather conditions to avoid extreme weather impacts [2]. Group 3: Significance of the Bridge - The Chizhou Yangtze River Bridge is a key project for the Hefei-Chizhou intercity railway, and its completion will significantly improve the transportation network in Anhui and accelerate integration into the Yangtze River Delta [2].