Introduction of Chongqing Kuimen Yangtze River Bridge?

Chongqing Kuimen Yangtze River Bridge is located at the mouth of Kuimen Canyon in fengjie county, Chongqing. It belongs to the intersection of land traffic and Yangtze River traffic in Chongqing, Shaanxi and Hubei provinces. It spans Fengjie and connects the two sides of Wushan, and is the location of the Three Gorges Immigrant New City. It is the second prestressed concrete bidirectional cable-stayed bridge where the Yangtze River enters Chongqing. It is a highway bridge with an "A" shape, and it is a cable-stayed bridge with two towers and two cable planes. Its main span is 460m (side beam concrete ranks third in China and fourth in the world among similar bridge structures), the whole bridge is 893m long and the deck is 20.5m wide. It is a two-way four-lane cable-stayed bridge with a design speed of 40 km/h and a total investment of 248 million yuan in bridge construction. After the completion of the bridge, the distance from the Three Gorges of the Yangtze River to the Tiankeng Ground Fissure Scenic Area in Hunan and Zhangjiajie National Scenic Area has been shortened. The unique Three Gorges culture and Three Kingdoms culture constitute the human landscape in the upper reaches of the Yangtze River.

History of bridge construction

/kloc-since 0/997, the Yangtze River Bridges in Fuling, Fengdu, Zhongxian and Wanzhou in Chongqing Reservoir Area of Three Gorges have been completed and opened to traffic, and the Yangtze River Bridges in Wushan, Fengjie, Yunyang and Wanzhou are under construction. In the past five years, Fengjie has built or rebuilt 9 bridges 109, including 9 bridges; In the past decade, nearly 20 bridges of various types have been built in Wushan County, far exceeding the total number of bridges built in more than 200 years in history.

Bridge characteristics

The main span of the bridge adopts structural measures such as longitudinal elastic restraint system, A-type main tower, cable plane of spatial fan-shaped cable-stayed bridge, large-diameter bored pile foundation, and new construction technologies such as hanging basket pouring No.0 and 1 blocks, non-flexible skeleton internal climbing frame construction tower, etc.

The main pier can meet the strength, stiffness and stability of the structure when the ship collides by adopting the measures of single box and multi-chamber cross section and strengthening near various water levels, and at the same time guide the ship to pass safely and smoothly through reasonable navigation marks.

The height of the main tower above the pile cap of the bridge is 206 meters and 265,438+065,438+0.60 meters respectively. Techniques such as A-tower, internal climbing tower without rigid framework, and circumferential prestressed finish rolling thick threaded steel bars in cable anchor area are adopted to ensure the safety performance of cable tower.

In the aspect of wind-resistant stability, the bridge adopts spatial double cable planes and A-shaped towers, and the torsional stiffness of the bridge is increased by stay cables to improve the wind-resistant stability. Considering wind resistance, earthquake resistance and internal force distribution under static load, the longitudinal semi-floating system is adopted.

In the process of bridge construction, the cable force, line shape and structural stress are well controlled, the closing accuracy of side span and middle span reaches millimeter level, and the error of finished bridge line shape and cable force is controlled within the target range. The preset maximum error values of the main girder alignment and cable force of the whole bridge are 3 cm and 5% respectively, and the control results have reached the predetermined "double control" target accuracy.

work progress

The project started at 1995.

199965438+February.

200165438+officially started on February 4th.

In August 2003, the tower was capped.

The main span was closed on March 16, 2005.

By the end of July 2005, the main bridge was completely completed.

It was opened to traffic on July 1 2006.

dependent event

Choose four bridge sites a year.

Hu Zhimin, the owner of the bridge and chief engineer of Three Gorges Road and Bridge Company, witnessed the whole process of the bridge from design to construction. Yesterday, he said, "It took a year just to choose the bridge site". 1998, the original construction site of the bridge is Baotaping, not far from Baidicheng. According to the survey results, the geological conditions there are the most suitable for bridge construction. However, this plan was immediately rejected by the National Tourism Administration, arguing that the bridge was too close to Kuimen and affected the natural landscape.

The subsequent bridge site was selected at about 1 km downstream of the current bridge. This plan was collectively rejected by the expert group because of the poor local geological conditions and the wide river surface, which led to the increase in cost. The last chosen address is 450 meters upstream of the current bridge position, but there is a hydrological flow observation station there. But the monitoring station couldn't move, so the bridge had to give in again. It was not until 1999 that this bridge site was selected.

The design of the bridge was changed five times.

In terms of bridge design, due to the high groundwater content and unstable rock stratum, which is located in the tuyere area of fengjie county, the design work started from 1997 to 200 1, during which the design was changed five times.

Hu Zhimin said that at first the bridge was designed as a suspension bridge, but because it could not affect the navigation of the golden waterway of the Yangtze River, the span between the two main piers was very large, and the suspension bridge was not practical at all. The scheme of a design institute in Wuhan has been discussed, tendered and revised many times, and it has become the best scheme. This is the fifth scheme. Its 460m main span has become the fourth longest bridge of its kind in the world.

Important significance

Provide convenient transportation

Fengjie Kuimen Yangtze River Bridge opens to traffic. According to the China Daily, this bridge has become the hundredth bridge on the main line of the Yangtze River from Tuotuo upstream to Wusongkou, Shanghai, and has become a landmark bridge on the Yangtze River. Since then, the Kuimen natural barrier has been unblocked, and the transportation network of Hubei, Hunan and Shaanxi has been connected with Chongqing.

According to the statistics of fengjie county Transportation Bureau, the average daily traffic volume of the bridge now exceeds 5,000 vehicles, while the maximum traffic volume at the entrance of the driveway in the past was 400 vehicles per day.

Zhou, director of the Office of the Transportation Bureau, said that the unbalanced development between the north and the south of fengjie county will disappear. He said that there are 15 townships in Fengjie, with half of the population on the south bank, as well as famous scenic spots such as tiankeng and ground fissures. In the past, the exchanges between the North and the South depended entirely on ferries. After the completion of the bridge, the time from the new county to the Tiankeng ground fissure scenic spot was shortened from two or three hours to 40 minutes.

An official of fengjie county Municipal Committee personally felt the convenience brought by the bridge. His hometown is on the south bank, only 1 1 km away from Xinxian County. In the past, he had to prepare for more than two hours every time he went home, because he had to wait for the ferry. It's only 20 minutes at most to go home now.

Promote the development of tourism resources

Fengjie, known as Kuizhou in ancient times, is a place where scholars gather for thousands of years. When the Yangtze River enters Kuimen, where fengjie county is located, Qutang Gorge, the world-famous first gorge of the Three Gorges, is formed. There are many scenic spots in the county, such as Baidicheng, Tiankeng, Ground Fissure and so on.

The Kuimen Yangtze River Bridge directly connects Enshi and Lichuan in Hubei, thus opening the fourth main road from Chongqing to Hunan in Hubei. In the future, this bridge will connect Hubei, Zhangjiajie and Xi, forming a tourist golden triangle.

Its completion will promote the construction and development of Fengjie North-South New Town and further accelerate the development of local tourism resources. It also plays an important role in improving the traffic network in the Three Gorges reservoir area.

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