Core Viewpoint - The construction of the Chongqi Railway and Highway Yangtze River Bridge and the Chongtai Yangtze River Tunnel will enable high-speed trains to cross the Yangtze River at speeds of 350 km/h without reduction, marking a significant advancement in China's high-speed rail infrastructure [1][2]. Group 1: Bridge Construction - The Chongqi Railway and Highway Yangtze River Bridge features a main span of 400 meters, ranking first in the world among similar bridges under construction [2]. - The bridge employs a dual-layer design, accommodating a six-lane highway on the upper level and high-speed rail on the lower level, creating a three-dimensional transportation system [2]. - The construction team has overcome significant challenges related to bridge deformation caused by wind and train forces, ensuring the stability of high-speed rail tracks [2][3]. Group 2: Tunnel Construction - The Chongtai Yangtze River Tunnel is the largest high-speed rail underwater tunnel in China, with a total length exceeding 14 kilometers and a single-shield tunneling distance of 11.3255 kilometers, the longest in the world [4][5]. - The tunnel construction involves advanced technology, including a shield machine equipped with an intelligent system for autonomous operation, ensuring precision and safety under high water pressure [5][6]. - Innovative materials and structural designs have been implemented to enhance the tunnel's stability and waterproofing, allowing for safe high-speed rail operation [5][6].

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 Viewpoint - The Shanghai Metro Line 22 (Chongming Line) is progressing well, with full line completion expected by October 2025 and operational readiness by the end of 2026, enhancing connectivity in the Yangtze River Delta region [3][4]. Group 1: Construction Progress - The Chongming Line has completed the main structure of four stations: Chenjiazhen, Dongtan, Yu'an, and Changxing Island, with track laying expected to finish by May 2026 [3]. - The line spans approximately 43 kilometers and includes eight stations, starting from Jinjilu Station in Pudong New District and crossing the Yangtze River twice [4]. Group 2: Transportation Infrastructure - A new comprehensive transportation hub will be constructed near Chenjiazhen Station, featuring 16 bus routes and optimized public transport networks to address last-mile connectivity issues [4]. - The construction of the Chongqing-Yu'an High-Speed Railway's Chongming section is progressing steadily, with over 10 kilometers of the Chongtai Yangtze River Tunnel expected to be completed by the end of 2025 [4].

Group 1 - The construction of the southern approach bridge of the Chongqi Public-Railway Yangtze River Bridge has been successfully completed with the final two segments of concrete poured [1] - The southern approach bridge is located in Qidong City, Jiangsu Province, featuring two continuous beams that cross Changdao Avenue and the South Chao River, with the upper layer for highways and the lower layer for high-speed and intercity rail lines, each measuring 830.05 meters [3] - The continuous beam over the South Chao River consists of 2-(2-64)m T-shaped beams, with a total length of 256 meters for the intercity side, and the 12th segment being a straight section with a height of 4 meters and a thickness of 0.4 meters for both the top and bottom slabs [5] Group 2 - The completion of the Chongqi Public-Railway Yangtze River Bridge will establish a new rapid transit corridor between the Shanghai, Nanjing, and Hefei metropolitan areas, significantly optimizing the railway network layout along the Yangtze River and supporting the coordinated development of the Yangtze Economic Belt [7]

Core Viewpoint - The completion of the final concrete pouring for the southern approach bridge of the Chongqi Railway-Highway Yangtze River Bridge marks a significant milestone in the construction of a new rapid transit corridor between major urban areas in the Yangtze River Delta region [1][5]. Group 1 - The southern approach bridge is located in Qidong City, Jiangsu Province, and features two continuous beams that cross the Changdao Avenue and the South Chao River [1][5]. - The upper layer of the bridge is designated for highways, while the lower layer accommodates high-speed and intercity rail lines, each measuring 830.05 meters in length [1][5]. - The construction involved five piers (S24-S28) for both the high-speed and intercity lines, with two sets of hanging baskets for each pier [1][5]. Group 2 - The bridge's segment over the South Chao River consists of a 2-(2-64)mT continuous beam, divided into 0-12 segments, with the intercity side continuous beam measuring a total of 256 meters [5]. - The 12th segment is a straight section with a height of 4 meters, and both the top and bottom slabs have a thickness of 0.4 meters [5]. - The T-beam cross-section has a flange width of 12.6 meters, with a concrete volume of 102.22 cubic meters and a concrete grade of C50 [5]. Group 3 - The completion of the Chongqi Railway-Highway Yangtze River Bridge is expected to enhance the railway network layout along the Yangtze River, support the coordinated development of the Yangtze Economic Belt, and promote high-quality integration in the Yangtze River Delta [5].

Core Viewpoint - The successful completion of the last segment of the movable formwork for the intercity side of the Chongqi Railway and Highway Yangtze River Bridge marks a significant milestone in the construction process, paving the way for the subsequent upper highway beam construction [1][3]. Group 1: Construction Progress - The Chongqi Railway and Highway Yangtze River Bridge has a total length of 1,069.27 meters, featuring a dual six-lane upper highway and a lower section for double-track high-speed rail and intercity rail [3]. - The last concrete beam poured was for the intercity side NC20-NC21 pier, measuring 40.6 meters in length and 12.2 meters in width, with a total concrete volume of 344 cubic meters [3]. - The use of a movable formwork system allows for segmental pouring of concrete beams between bridge piers, significantly shortening the construction cycle and minimizing environmental impact [3]. Group 2: Winter Construction Preparations - To prepare for the final segment of the movable formwork pouring, the project team avoided low-temperature periods below zero degrees Celsius and held special briefing sessions to optimize the construction plan [2]. - Technical personnel monitored concrete temperature throughout the process to ensure compliance with quality standards, and winter construction safety training was conducted to address equipment operation, anti-freezing measures, and emergency rescue protocols [2]. Group 3: Strategic Importance - The Shanghai-Nanjing-Hefei high-speed railway is a crucial part of the eastern segment of the Huhang Railway and an important component of the national "Eight Vertical and Eight Horizontal" high-speed railway network, enhancing passenger flow along the Yangtze River corridor [5]. - The completion of this project will establish a rapid new corridor between the Shanghai, Nanjing, and Hefei metropolitan areas, optimizing the railway network layout in the Yangtze River region and supporting the coordinated development of the Yangtze Economic Belt [5].

Core Viewpoint - The successful completion of the last 7 meters of the steel beam push for the Chongqi Railway and Highway Yangtze River Bridge marks a new record in construction technology for similar bridges in China, showcasing advanced engineering capabilities and providing valuable experience for future projects [1][3]. Group 1: Construction Details - The non-navigation hole bridge consists of 11 steel beams with a total length of 1205.4 meters and a total weight of 38,900 tons, constructed in 13 rounds of pushing [3]. - The main navigation hole spans 992 meters, with two side spans on each of the 3rd and 4th piers, utilizing segmental lifting, welding, and pushing techniques [3]. - The final push of 7 meters was completed successfully, with subsequent work planned for the installation of steel beams at the mid-span piers [3]. Group 2: Technological Innovations - The project team developed a multi-point adaptive synchronous pushing control system, enabling intelligent operation and precise positioning of the steel beams [3][5]. - During the pushing process, strict monitoring ensured that beam displacement did not exceed 20mm, with adjustments made to maintain accuracy within 10mm for subsequent segments [3][5]. - The construction utilized advanced techniques for temperature-induced displacement control and real-time monitoring, contributing to the overall success of the project [5]. Group 3: Project Significance - The Chongqi Railway and Highway Yangtze River Bridge is a key project for the Shanghai-Chongqing Railway, enhancing connectivity in the Yangtze River Economic Belt and supporting high-quality integrated development in the Yangtze River Delta [9]. - The bridge serves as an important part of the national "Eight Vertical and Eight Horizontal" high-speed railway network, facilitating passenger flow between major urban areas [9].

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 completion of the last road beam assembly for the non-navigation hole of the Chongqi Railway and Highway Yangtze River Bridge marks a significant milestone in the construction process [1][3] - The bridge, with a total length of 4.09 kilometers, is a key control project for the high-speed rail connecting Shanghai, Nanjing, and Hefei, and is recognized as the world's largest span double-tower, double-cable surface railway and highway dual-use cable-stayed bridge [5] Group 1 - The non-navigation hole bridge spans 2,197.4 meters and consists of 16 piers, with 6 piers on the north side serving as the main navigation hole and 10 piers on the south side as non-navigation holes [1] - The non-navigation hole bridge features an 11-hole continuous steel truss beam with a total span arrangement of 99.2 + 9×112 + 98.2 = 1,205.4 meters, utilizing a double main truss triangular arrangement [1] - The construction employed a "shore-side scattered assembly + multi-point synchronous pushing" method due to water depth restrictions, achieving a total pushing distance of 1,267 meters and a total pushing weight of 38,900 tons, ranking first in domestic similar bridge pushing distance and second in weight [1] Group 2 - The completion of the non-navigation hole bridge's road beam assembly facilitates the final round of pushing and subsequent integration with the main navigation hole steel beams, as well as the installation of the road bridge deck [3] - The project is expected to create a fast new corridor between the Shanghai metropolitan area, Nanjing metropolitan area, and Hefei metropolitan area, optimizing the railway network layout along the Yangtze River and supporting the coordinated development of the Yangtze Economic Belt [5]

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]