Core Viewpoint - The construction of the Chongqi Railway and Highway Yangtze River Bridge, a key project of the North Jiangsu High-speed Railway, has reached an important milestone with the successful installation of the first cable of the main span, marking the beginning of the cable installation phase for the largest cable-stayed bridge in the Yangtze River Basin [1]. Group 1 - The bridge features a total length of 4.09 kilometers and spans the northern channel of the Yangtze River estuary [7]. - It is designed as a dual-use bridge with a double-layer layout, where the upper layer consists of a two-way six-lane highway with a speed limit of 100 km/h, and the lower layer accommodates a double-track high-speed railway with a speed of 350 km/h and a double-track intercity railway with a speed of 250 km/h [7]. - The bridge is recognized as the world's largest span double-tower double-cable-stayed bridge with ballastless track [7]. Group 2 - The bridge includes 112 cables, with 14 groups of cables (4 cables per group) for both the 3rd and 4th towers, where the maximum length of a single cable is 203 meters and weighs over 36 tons [3]. - The cables are made of 7mm diameter parallel steel wires, arranged in a double cable surface layout horizontally and in a fan shape vertically, with a standard tensile strength of 2100 MPa and a zinc-aluminum alloy coating on the surface [3]. - The concrete deck on the southern side of the bridge has been completed, while the middle span's concrete deck is yet to be installed, with the installation of the southern cantilever steel beam expected to take place on January 23 [5].

Core Points - The installation of the south span steel beams for the Chongqi Railway and Highway Yangtze River Bridge has been successfully completed, marking a significant milestone in the construction process [1] - The main navigation hole steel truss of the bridge measures 992 meters in total length, with a main span of 400 meters and consists of 6 piers [3] - The bridge is a key control project for the Shanghai-Nanjing-Hefei high-speed railway, featuring a dual-layer design for both road and rail use [8] Summary by Sections - **Construction Progress** - The last steel beam for the south span, weighing 933.71 tons, has been installed, and the next steps include the installation of support structures and bridge deck panels [6] - The south span pushing operation is expected to be completed by late November, with the main navigation hole piers anticipated to be connected by May next year [6] - **Bridge Specifications** - The bridge spans a total length of 4.09 kilometers and crosses the northern channel of the Yangtze River estuary [8] - The upper layer accommodates a six-lane highway with a speed limit of 100 km/h, while the lower layer supports a high-speed railway with speeds of 350 km/h and an intercity railway at 250 km/h [8] - It is recognized as the world's largest span double-tower, double-cable-stayed railway and highway bridge without ballast track [8]

Core Points - The successful installation of the E25 segment steel beam marks a significant milestone in the construction of the Chongqi Railway and Highway Yangtze River Bridge, which is a key project for the Shanghai-Nanjing-Hefei high-speed railway [1][3] - The total length of the main navigation hole steel truss beam is 992 meters, with the Shanghai side comprising 512.4 meters and weighing 18,743 tons [3] - The bridge features a dual-layer design for both rail and road use, with the upper layer accommodating a six-lane highway and the lower layer supporting high-speed rail and intercity rail [5] Summary by Sections - **Construction Progress** - The E25 segment steel beam, weighing 523.9 tons and measuring 12.5 meters, has been successfully installed, contributing to a total weight of over 20,000 tons for the main navigation hole beams [1] - A total of 13 segments have been installed, with plans to complete the edge span installation in November [3] - **Bridge Specifications** - The Chongqi Railway and Highway Yangtze River Bridge spans 4.09 kilometers and crosses the northern channel of the Yangtze River estuary [5] - It is recognized as the world's largest span dual-tower, dual-cable-stayed bridge with ballastless track for both rail and road [5] - **Future Developments** - The main bridge's mid-span closure is expected to be achieved in the first quarter of next year [3]