Wuhu Yangtze River Bridge

Highway railway bridge. Wuhu Yangtze River Bridge, located in Wuhu, Anhui Province, is a key transportation construction project of the ninth five year plan. The main span of the bridge is 312 meters, the total length of the bridge railway is 106.16 meters, the highway is 6078 meters, and the main bridge is 2193 meters; the bridge railway is a double line, the total width of the highway deck is 21 meters, and the net height of navigation is 24 meters. It is the first dual-purpose cable-stayed bridge for highway and railway in China. The bridge started construction in March 1997 and was completed and opened to traffic at the end of September 2000.

Wuhu Yangtze River Bridge

Wuhu Yangtse River Bridge is a river crossing channel in Jiujiang District, Wuhu City, Anhui Province, China. It is located on the Yangtze River waterway. It is a key transportation construction project in the Ninth Five Year Plan of China and the first highway and railway bridge in Anhui Province.

Wuhu Yangtze River Bridge started construction on March 22, 1997;

The main span steel girder closure project was completed on May 2, 2000, and the bridge was put into operation on September 30, 2000.

Wuhu Yangtze River Bridge starts from Erba hub in the west, crosses the Yangtze River Waterway in the upper and Jiuhua North Road in the East; the main bridge is 2193m long with a main span of 312m; the upper highway bridge deck is a two-way four lane urban trunk road with a design speed of 100km / h, and the lower railway bridge is a double track with a design speed of 160km / h; the total investment of the project is RMB 4.546 billion yuan.

Construction process

In 1917, Dr. Sun Yat Sen put forward the original idea of building Wuhu Yangtze River Bridge.

In 1956, Wuhu Yangtze River Bridge project began to carry out bridge site and survey work.

In 1958, Wuhu Yangtze River Bridge applied for the bridge project proposal to the people's Republic of China.

In 1959, the preliminary design of Wuhu Yangtze River Bridge was completed.

In 1961, the survey of Wuhu Yangtze River Bridge was stopped, and three bridge sites, guangfuji, sinaishan and huogang, were reserved.

In October 1993, the Wuhu Yangtze River Bridge passed the evaluation of the feasibility study report and decided to use guangfuji bridge site.

On March 22, 1997, construction of Wuhu Yangtze River Bridge started.

On May 2, 2000, Wuhu Yangtze River Bridge completed the main span steel girder closure project, and the whole bridge was completed; on September 10, Wuhu Yangtze River Bridge was accepted;

On September 30, Wuhu Yangtze River Bridge was opened to traffic and a celebration was held.

On June 8, 2004, the bridgehead construction project of Wuhu Yangtze River Bridge was carried out.

On July 21, 2005, Wuhu Yangtze River Bridge passed the acceptance work entrusted by the Ministry of transport of the people's Republic of China and the people's Government of Anhui Province by the national development and Reform Commission of the people's Republic of China.

Bridge location

Wuhu Yangtze River Bridge is located in Wuhu City, Anhui Province, China, connecting the East and West banks of Jiujiang District, about 3.5km away from the third Wuhu Yangtze River bridge downstream; the railway of Wuhu Yangtze River Bridge connects Huainan line in the north, Ningwu, Wutong, Anhui Jiangxi and Xuanhang lines in the South; the highway bridge passes through Wuhu Hefei Expressway < I (National Highway G50 < sub11 < / sub) < / I, provincial highway 319 in the West and national highway 205 in the East.

Architectural design

building structure

Overall layout

Wuhu Yangtze River Bridge is composed of two deck main bridges on water, approach bridges on both banks, two pylons, piers and ramps. The main bridge section is arranged from due west to due east.

 

Design features

Design parameters

The total length of Wuhu Yangtze River Bridge is 10624.4m, the total length of highway bridge is 6078.4m, the total length of main bridge across the river is 2193.70m, the main span is 312m, and the width is 18m. The main bridge span is (120 + 2 × 144) m + 2 × (3 × 144) m + (180 + 312 + 180) m + (120 + 120) M. The main truss is 14 meters high, 12.5 meters wide, the width span ratio of side span and middle span is 1 / 14.4 and 1 / 25, and the length of internode is 12 meters; the maximum axial force of chord is 5000 kn, and the maximum plate thickness is 50 mm. The width of the member is 1100 mm, the height of the upper chord is 1460 mm, the height of the lower chord is 166 mm, the height of the web member is 700-1100 mm, the maximum length is 15.1 m, and the maximum lifting load is 36 tons. The height of the tower above the highway is 33.2m, the ratio of side span to main span is 0.577, the ratio of tower height to main span is 0.11, and the inclination angle of the outermost cable is about 15 degrees; the section of the pier body at the bottom of the tower is (14 × 22) m, and the top of the tower column is (8.5 × 4.4m); the diameter of the stay cables is 7mm, with 2 cables per cable. The dead load cable force of a single cable is 6950kn, the live load cable force is 1750kn, the maximum cable force is 8700kn, and the fatigue stress amplitude is 130Mpa The heaviest is 14 tons.

 

 

Equipment and facilities

Speed monitoring

As of December 2017, Wuhu Yangtze River Bridge has set up speed measuring stations on the connecting lines of the north and south sides to measure the speed of vehicles entering the bridge.

 

Operation

Fare system

From January 1, 2014, when the passenger cars with less than 7 seats of Anhui B number plate pass through the toll station of Wuhu Yangtze River Bridge, there will be no bridge toll, and the cost will be subsidized by Wuhu Finance Bureau.

 

traffic flow

As of December 2017, the average daily traffic volume of Wuhu Yangtze River Bridge is more than 30000 vehicles.

 

From April 29 to May 1, 2018, 184052 vehicles of various types passed through Wuhu Yangtze River Bridge.

 

As of December 2019, the average daily traffic volume of Wuhu Yangtze River Bridge is about 45000 vehicles.

Construction achievements

Technical problems

Construction problems

1. During the design of Wuhu Yangtze River Bridge, there is a rare "three in one" problem. The beam bottom elevation of the upper structure of the main bridge is controlled by the navigation clearance, while the line elevation of the railway bridge is controlled by the connection elevation with the existing marshalling station. The bridge is located in the airport side clearance, and the height of the bridge building is controlled by the flight clearance. Due to the strict restrictions of these three elevation control lines, the main bridge is not allowed to be built It is possible to use concrete rigid frame or continuous beam, and it is impossible to use cable-stayed bridge designed according to normal proportion.

 

2. Railway dynamic load and highway dynamic load are completely different in nature. The load of the first line of railway is equivalent to the design load of 15 lines of vehicles, and the dynamic effect of the train can not be compared with that of the vehicle. Due to the large dynamic effect of the train, there are strict requirements on the running stability of the train and the comfort of the drivers and passengers. The rigidity of the bridge is very important, and the rigidity is suitable for the railway bridge The bridge of the system. The highway vehicle load is light and flexible, and the action of mobile force is small, so the flexible system bridge can be used. It is technically difficult to transform a flexible cable-stayed bridge into a rigid one.

 

construction technique

There are three types of new technologies used in Wuhu Yangtze River Bridge

1. Low pylon cable-stayed bridge for highway and railway;

2. The stiffening truss of cable-stayed bridge adopts 14 Mn Nb steel thick plate welded integral joint;

3. The truss beam is composed of reinforced concrete slab and steel truss beam.

 

technological innovation

1. The maximum span of the main span steel girder was 312m, which was the largest span of the highway railway bridge at that time. Under the condition of limited clearance, the low tower structure solved the stress problem of the long-span bridge. The steel truss girder cable-stayed bridge type adopted was the first time in China.

2. The main bridge steel beam is made of 14MnNbq steel which is the latest low alloy structural steel developed in China. It has good comprehensive properties, especially the low temperature impact toughness is greatly improved, which represents the highest level of bridge structural steel in China at that time.

3. The main bridge steel beam adopts thick plate (the maximum plate thickness is 50 mm) welded fully closed integral joint, box section, large diameter (diameter is 30 mm) high-strength bolt connection, multi-dimensional complex stress integral joint, adopting factory system, which improves the integrity, ensures the structural quality, simplifies the field installation operation, and reaches the world advanced level.

4. The reinforced concrete deck of Zhengqiao highway is the largest span plate truss bridge in China at that time, because it is combined with steel truss beam through wet joints and shear studs.

5. The foundation of main bridge and auxiliary channel adopts large diameter and deep high pile cap and rock socketed pile foundation, and kpg3000 full hydraulic large torque drilling rig is developed in construction. After many tests on site, the management rules and technical standards have been formulated. All the pile foundations have been successfully drilled, and the excellent rate of pile foundation is 100%. The experience has been accumulated for the construction of similar bridges in the future.

6. For the construction of double wall steel cofferdam, according to the terrain and geological conditions and local conditions, new methods such as air bag rolling down the river and cofferdam piece by piece launching and water matching are adopted to simplify the process, facilitate the construction and reduce the cost.

Chinese PinYin : Wu Hu Zhang Jiang Da Qiao