Yangluo Yangtze River Bridge is a key construction project of the country, Hubei Province and Wuhan City during the Eleventh Five-Year Plan period, and it is an important part and control project of Wuhan Ring Highway, Beijing-Zhuhai and Shanghai-Chengdu National Highway.
Yangluo Yangtze River Bridge is the fifth Yangtze River Bridge in Wuhan. It was officially completed and opened to traffic on February 26th, 2007. At this point, the "five vertical and seven horizontal" national trunk lines have achieved comprehensive interconnection in Wuhan.
general situation
Wuhan Yangluo Yangtze River Bridge, also known as Wuhan Yangtze River Fifth Bridge, is located about 27. 19 km downstream of Wuhan Yangtze River Bridge. The north bank of the bridge is Yangluo Street in Xinzhou District, and the south bank is Xiangjiawei Village in Qingshan District.
Yangluo Yangtze River Bridge is designed with a total length of10km, consisting of a main bridge of 2.7km, a wiring line of 7.3km and an interchange. The bridge deck is 33 meters wide, with six lanes in both directions and asphalt concrete pavement. The expressway Bridge is a fully enclosed overpass, and the designed driving speed is1.20km/h. ..
With a total investment of about 2 billion yuan, the bridge is a single-span suspension bridge with a main span of 1.280 meters. It is the eighth largest suspension bridge in the world and the third in China. The south anchorage foundation project of the bridge is known as "the first anchor in China".
The construction and demolition of Yangluo Yangtze River Bridge began in June 2003 at 5438+065438+ 10. In April 2005, the pylon was successfully capped and the superstructure was installed. On June+10, 5438, the catwalk was completed and the main cable strand was erected. The steel box girder was hoisted in April 2006 and completed in June 65438+February 65438+June 2007.
trait
During the construction of Wuhan Yangluo Yangtze River Bridge, great attention was paid to scientific and technological innovation. The construction headquarters has successively identified a number of scientific research topics, achieved fruitful scientific research results, and successively applied them to construction practice.
Unique and elegant Yangluo Bridge
The concrete main tower structure of Yangluo Yangtze River Bridge adopts a unique form of "scissors bracing", which is more novel and beautiful than the traditional H-shaped and portal main towers. The main tower adopts steel brace for the first time, which changes the beam mode of domestic bridge towers and enriches the connotation of bridge landscape.
New anchorage system with excellent performance
Aiming at the irreplaceability and durability of the prestressed anchorage system of suspension bridge anchorage, engineers and technicians developed a new type of grease anticorrosion prestressed anchorage system with good durability, detectability, replacement, safety and reliability, and obtained a national patent. This new anchorage system is applied to engineering practice for the first time in China, and a new prestressed anchorage form of suspension bridge anchorage is explored.
Digital maintenance monitoring system has always been concerned about bridge health.
In the construction and long-term health monitoring of Yangluo Yangtze River Bridge, fiber grating sensing technology with independent intellectual property rights is adopted to monitor the stress, cable force and bridge vibration of key parts of the bridge structure. Fiber Bragg grating sensor can achieve the same life as the monitored object, which solves the problem that traditional monitoring methods can not monitor the safety of bridges stably for a long time, provides a strong guarantee for the safety of bridge construction, and also provides diagnostic means and scientific basis for the long-term operation and health of bridges.
Large-tonnage damping device improves seismic performance of bridge
Yangluo Yangtze River Bridge adopts the largest tonnage compound damping device in China, which can greatly improve the seismic performance of the bridge structure, reduce the adverse effects of vibration under live load of vehicles on the main structure and expansion joints of the bridge, and improve the service life of the structure, thus prolonging the service life of the bridge.
Double-layer epoxy asphalt solves this problem.
Aiming at the worldwide problem of asphalt concrete pavement of steel deck of Yangluo Yangtze River Bridge, the headquarters cooperated with relevant universities to carry out special scientific research projects, and adopted epoxy asphalt technology with high strength, high rigidity, strong deformation resistance and strong adhesion with steel plates for the first time in Hubei Province, striving to achieve a breakthrough in asphalt concrete pavement of steel deck of Yangluo Yangtze River Bridge.
Reliable and safe power supply transmission system
The Yangluo Yangtze River Bridge adopted the medium voltage transmission system for the first time in Wuhan Bridge. The medium voltage transmission system adopts the appropriate 5.5kV transmission voltage level, and an independent system isolated from the power grid is established through neutral grounding. Through simple and reliable system protection and lighting control scheme, the power supply quality is greatly improved. Compared with the traditional high and low voltage power supply mode, it has incomparable advantages in reliability, safety, advanced equipment and completeness.
Dream landscape illumination
The landscape lighting of Yangluo Yangtze River Bridge consists of floodlighting of the main tower facade, floodlighting of the whole bridge outline, floodlighting of slings, road lighting and intelligent control system. The functional lighting of the lighting system adopts variable power, highlighting the concept of energy saving. In addition, the whole bridge adopts omni-directional energy-saving landscape lighting system, and the new full-color color-changing LED changes the main colors such as red, yellow, blue and green to achieve fantastic landscape effect.
A hundred years later, the style remains the same.
In order to cope with the air pollution and the increasingly complex external environment, the main tower and anchorage of Yangluo Yangtze River Bridge and other key concrete structures are coated with silane, which makes their surfaces have excellent hydrophobicity and maintains good air permeability of concrete. Anti-corrosion new clothes improve the structural quality and safety factor of the bridge and ensure its service life of more than 100 years.
difficulty
During the construction of Wuhan Yangluo Yangtze River Bridge, the advantages of "four in one" in scientific research, survey and design, engineering construction and machinery manufacturing of CCCC No.2 Navigation Bureau overcame eight major construction difficulties.
In the construction of anchorage foundation, four major difficulties, namely excavation, lining, anti-seepage enclosure and interchange construction, of the super-large foundation pit with a length of 65 meters, a width of 60 meters and a depth of more than 50 meters have been overcome, and the worldwide problem of cracks caused by hydration heat during the pouring of super-large concrete has been solved. In the construction of the main tower with a height of 165m, the world's most advanced hydraulic climbing formwork system was introduced, and at the same time, the best concrete mixture ratio was prepared with technical innovation as the guide, so that the linear control and appearance quality of the main tower column reached the first class. For the first time, the bridge adopts a new technology of box steel structure support. By welding the steel support with the embedded steel plate on the tower, the traditional cast-in-place concrete middle beam structure is replaced. The construction problem of super-large scissors with weight 1.26 tons, overall lifting height 1.30 meters and accurate positioning welding was solved. In the catwalk erection and main cable erection, the "trinity" full-through catwalk construction and towing cable circulation system of the main span and two side spans was pioneered, which provided safe, reliable and fast construction guarantee for the bridge; Using the world-leading GPS satellite monitoring system, several subsystems, such as GPS satellite positioning, closed connecting pipe liquid level deflection test, dynamic and static test, are established to carry out long-term health monitoring system for bridges.
Wuhan Yangluo Yangtze River Bridge is the fourth largest suspension bridge in China after Jiangsu Runyang Yangtze River Bridge, Hong Kong Qingma Bridge and Jiangyin Yangtze River Bridge.
The completion of Wuhan Yangluo Yangtze River Bridge has fully demonstrated the scientific and technological strength of Wuhan as the "Bridge Building Capital of China", indicating that China's bridge construction level has been advanced in the world.
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