Sutong Yangtze River Highway Bridge, referred to as Sutong Bridge for short, is located in the southeast of Jiangsu Province, connecting Nantong and Suzhou, 82km west of Jiangyin Yangtze River Highway Bridge and 0/08 km east of the Yangtze River estuary. The project, with a total length of 34.2 kilometers, started on June 27, 2003 and was completed and opened to traffic on June 30, 2008. The north bank of Sutong Bridge connects Tongyan Expressway, Tong Ning Expressway and Tongqi Expressway, and the south bank connects Sujiahang Expressway and Jiang Yan Expressway.

engineering scale

Sutong Bridge has a huge scale: its main span reaches1.088m, making it the second largest cable-stayed bridge in the world (as of 20 13, the largest main span of cable-stayed bridge is the Russian Island Bridge in Dombas, with the main span of1.04m); Its main tower is 300.4 meters high and is the second tallest bridge tower in the world (the first Gao Qiao Tower is a Russian island bridge across the Russ Strait in Dombas, with a tower height of more than 320 meters); The two main pier foundations of the main bridge adopt 13 1 cast-in-place piles, with a diameter of 2.5m to 2.85m and a length of about120m, which is the largest pile group foundation in the world. The longest stay cable of the main bridge is 577 meters long, which is also the longest stay cable in the world. The main quantities are: bridge and culvert concrete 6.5438+0.493 million cubic meters, steel box girder 49,000 tons, steel 230,000 tons, stay cables 6,278 tons, filling and excavation 3.65438+0.76 million cubic meters, land acquisition 65438+0./kloc-0.000 million mu.

bridge construction

Sutong Bridge starts from Xiaohai Interchange of Tongqi Expressway and ends at Dong Bang Interchange of Sujiahang Expressway. The total length of the route is 33.2 1 km, which is mainly composed of three parts: the northern shore connection project, the cross-sea bridge project and the southern shore connection project.

River-crossing bridge project: total length is 8206m, in which main bridge100+100+300+1088+300+100 (length of main bridge is about1088m) is the main span of cable-stayed bridge/. The main tower is 300.4 meters high, ranking second in the world; The length of stay cable is 577 meters, ranking first in the world; The plane size of pile group foundation is113.75m x 48.1m, ranking first in the world. The T-shaped rigid frame girder bridge with140+268+140 = 548m is adopted for the special waterway bridge, which is the second in the world for similar bridge engineering. The north-south approach bridge adopts 30-meter, 50-meter and 75-meter prestressed concrete continuous beam bridges;

2. North shore wiring project: the total length of the route is 15. 1 km, with two interchanges, a main toll station and a service area;

3. South bank wiring project: The total length of the line is 9. 1km, and an overpass is set up.

Sutong Bridge adopts the standard of two-way six-lane expressway, and the calculated running speed of the north and south banks is 120km/h, and that of the river-crossing bridge is100km/h.. The design load of the whole bridge and culvert is 20 cars, 120 trailers. The navigation clearance of the main bridge is 62 meters high and 89 1 m wide, which can meet the navigation needs of 50,000-ton container ships and 48,000-ton fleets. The whole line needs about 250,000 tons of steel, 6.5438+0.4 million cubic meters of concrete, 3.2 million cubic meters of fill, more than 10,000 mu of land/kloc-0, and 260,000 square meters of demolished buildings. The total investment of the project is about 6.45 billion yuan, and the planned construction period is 6 years.

Important significance

The successful construction of Sutong Bridge has set an example for engineers to pursue technical Excellence and continuous innovation. Sutong Bridge pioneered a new bridge structure system, key devices and design methods combining static limit and dynamic damping in the world, which made the kilometer-class cable-stayed bridge realized for the first time in the world. The anchorage structure of combined cable tower with built-in steel anchor box, large group pile foundation structure and design method have been developed, which have been widely used in many international major bridge projects such as Sutong Bridge. It pioneered the construction control technology of large-scale deep-water pile group foundation in the world; The construction control target, overall method, process, content and control accuracy standard of the kilometer cable-stayed bridge are put forward for the first time in the world. Based on the principle of geometric control method, the three-dimensional stress-free geometry of multi-components and the control method of the whole process of design, manufacture and installation are systematically established for the first time in the world. The control accuracy of this method is higher than that of similar international standards, which solves the technical problem of construction control of thousand-meter cable-stayed bridge. The innovation and application of these technologies have strongly supported the construction of Sutong Bridge, achieved a breakthrough in key technologies of the 1,000-meter cable-stayed bridge, and made important contributions to the technical development of cable-stayed bridges in the world.

Sutong Bridge successfully overcame the four construction challenges brought by natural disasters in the Yangtze River, such as poor meteorological conditions, complex hydrological conditions, deep bedrock burial and high navigation density, and created the longest span 1088m, the highest pylon 300.4m, the longest stay cable 577m, 13 1 cable length1. Previously, the world record of the longest span of cable-stayed bridge was Toto Luo Qiao with a main span of 890m m, and the completion of Sutong Bridge increased the world record of the longest span of cable-stayed bridge by 22%, greatly improved the competitiveness of cable-stayed bridge and opened a new chapter in the development history of cable-stayed bridge in the world.

Sutong Bridge adheres to FIDIC concept in the whole process of project management, adopts contract management mode and quality management mode, efficiently coordinates the activities of dozens of consulting, scientific research, contractors and other institutions, ensures the management objectives of project quality, progress and investment control, pays attention to strength building, and cultivates a large number of engineering consulting and management talents. Sutong Bridge, as the world's first cable-stayed bridge with a span of over 1000 meters, maintains a perfect balance in environmental protection, durability and economic and social benefits, with beautiful alignment, leading technology and scientific management, which well interprets the modern bridge construction concept.

Sutong Bridge adopts the cable-stayed bridge scheme with main span1088 m. Compared with the suspension bridge scheme that must be adopted in this span field in the past, it directly saves about 200 million US dollars in engineering investment, avoids the damage and adverse impact of huge underwater anchorage on the river regime and aquatic ecosystem of the Yangtze River, and more effectively guarantees the navigation safety of the Yangtze River and the safety and environmental protection of the Yangtze River estuary.

Sutong Bridge has established a perfect real-time on-line structural health monitoring system. The monitoring objects are divided into two categories: load monitoring and structural response monitoring. Load monitoring mainly includes environmental parameters (wind, atmospheric temperature and humidity and bridge internal temperature), and structural response monitoring mainly includes overall displacement, bearing displacement, acceleration, stress and strain monitoring. The whole bridge has 565 measuring points and 597 sensors. The monitoring after more than four years of operation shows that the structural displacement and stress level of the bridge are within the design and prediction range, and the bridge is in elastic working state, in good condition in all aspects and in good structural performance, which fully meets the requirements.

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