Nanchang Bridge

Nanchang Bridge

Nanchang bridge is located in Nanchang, the central city in the middle and lower reaches of the Yangtze River and the capital of Jiangxi Province. Nanchang bridge, which spans between Chaoyang island and Honggutan, is the first pedestrian and highway bridge built on Ganjiang River in China. It is known as "the first bridge of Ganjiang River in thousands of miles".

The construction of Nanchang bridge was started on September 1, 1994. The construction of the bridge has been strongly supported by the world bank. The upper deck of the main bridge is a two-way six motorway bridge with a total width of 30.35 meters, and the lower deck is a non motorway and sidewalk. Nanchang bridge is the first modern bridge in Ganjiang River, just like a giant dragon lying on Ganjiang River.

geographical position

Nanchang bridge is located in Xihu District and Xinjian District of Nanchang City, the capital of Jiangxi Province. It is the first and longest double deck highway bridge in China, with Xinjian district on the West Bank and Xihu District on the east bank. The bridge spans both sides of the Ganjiang River and is very spectacular. Nanchang bridge across Ganjiang River is a world bank loan project with a total investment of 618 million yuan. The main bridge adopts six lane double-layer single box prestressed reinforced concrete continuous beam. The upper layer is motor vehicle lane and the lower layer is non motor vehicle lane. The design load exceeds grade 20 and the daily carrying capacity is 50000 vehicles. It was completed and opened to traffic on January 10, 1994. Nanchang bridge is also the river crossing hub of the first ring line of Nanchang Road. Nanchang bridge is equipped with sightseeing elevator, visitors can take the elevator to the bridge for sightseeing.

Traffic information

Take 9 / 27 / 26 / 38 / 146 / 169 / 202 / 204 / 251 / 238 / 255 / 221 / 228 / 229 / 830 / 864 / high speed rail 1 / Airport 1 / 225 / 253 to Nanchang bridge

Nanchang bridge is not only the urban bridge connecting Nanchang with Changbei and Xinjian District, but also the highway bridge leading to Ganbei and Northwest Jiangxi and three national highways from Beijing to Guangzhou, Fuzhou to Lanzhou and Shanghai to Kunming. Its completion and opening to traffic promoted the development of industrial and agricultural production in Nanchang, optimized the investment environment, and played an extremely important role in revitalizing Jiangxi's economy and transportation. Nanchang bridge and the world's second highest, the famous star of Nanchang Ferris wheel oblique angle.

Technology Overview

The steel frame of the main bridge deck has a total of 438 steel beams, one of which weighs 80 tons, which is the largest in China; the thickest steel plate used for making steel beams is 80 mm, which is the thickest in China. The diameter of more than 100000 sets of high-strength bolts used for assembling steel frames is up to 30mm. The size of bolts is unprecedented in the history of bridge construction in China.

The main bridge deck of the bridge is suspended on the pylon by 180 steel cables, of which the thickest one is twisted by 265 high-strength steel wires with a diameter of 7mm, with a diameter of 146mm and a weight of 20t, ranking first in China. It is 223 meters long and stands up to the height of three international hotels. 180 steel cables are fixed on the main tower after being pulled by jacks. The pulling force of each jack is 601 tons, which is also the highest in China.

technical characteristics

Nanchang bridge is the first double deck three-dimensional diversion urban highway bridge in China. The upper deck is 23m wide, which can be paralleled by six cars; the lower deck is 6m wide on both sides, which is non motorized lane and sidewalk. The whole bridge is 2780m long (including 801.55m East-West approach road), with 42 piers and abutments. The upper structure of the main bridge and the west approach bridge is a double-layer single box single cell flat chord prestressed concrete continuous box girder, the East approach bridge is a pretensioned prestressed concrete simply supported hollow slab girder, and the lower structure is a bored pile foundation. In the original design of the superstructure of the west approach bridge of XX bridge, 15 holes (15 × 48m) (25 # 40 # pier) prestressed concrete continuous beam is designed, with the width of the top plate of 23m, the width of the bottom plate of 11m and the beam height of 4.51m. There is no longitudinal slope on the bridge deck, with a cross slope of 2%. The cross section of the box girder is single box and single room with equal height. In order to meet the needs of the whole bridge closure and opening, the construction of the whole bridge requires that all construction sites should be operated in parallel, so as to shorten the construction period Therefore, the superstructure construction of the west approach bridge has been changed from the original design of 15 holes to 12 holes (between 28 # 40 # piers) and 3 holes (between 25 # 28 # piers) of scaffolding cast-in-place construction. The construction method and construction organization design of the holes are described in detail.

Bridge reconstruction

Repair the old as new

Nanchang bridge maintenance and reconstruction project was officially closed on June 10, 2010. After more than 60 days of hard work, the bridge will be officially opened to traffic at 0 o'clock on August 16, 25 days ahead of the original plan of September 10. It is a Nanchang bridge with safe structure, beautiful landscape and new appearance.

Looking back on the whole process of Nanchang bridge maintenance and reinforcement, the reporter found that the maintenance seems to be "technology content" is not high, just to deal with beam cracks, repaving the bridge deck and so on. The relevant person in charge of Nanchang Urban Construction Investment Development Co., Ltd., the owner of the project, introduced the maintenance and reconstruction of the whole bridge. It is reported that the main purpose of the maintenance of Nanchang bridge is to "cure" the disease of the bridge and ensure the safe use of the bridge. The guiding principle of bridge reinforcement and maintenance is: diagnosis and treatment of diseases, repair as new, beautiful and economic.

In the reinforcement and maintenance of the bridge, the structural defects of the main bridge and approach bridge are repaired and their integrity is restored. The cracks of the whole bridge body and pier are treated by grouting or sealing to restore the structural integrity. The pitted surface and small holes in the beam and pier are repaired with epoxy mortar or epoxy concrete; the honeycomb and large holes are repaired with epoxy concrete. At the same time, inclined steel plate or carbon fiber cloth is pasted on the inner side of the web near the beam support to enhance the structural resistance of the beam.

In addition, the upper deck of the whole bridge was renovated by chiseling out the pavement layer of the original motorway deck, laying 6cm thick waterproof concrete, spraying American waterproof liquid, and laying 4cm thick modified asphalt. 12 bridge expansion joints were replaced, old concrete railings were removed and replaced with stainless steel composite pipe railings, and the bridge was repainted. At the same time, the lighting project of the bridge was carried out, including replacing 134 LED street lamps in the motorway; installing 9700 LED landscape curtain wall lamps on both sides of the bridge; installing 116 LED projection lamps on the piers; installing 1200 ceiling lamps in the non motorway; and reconstructing 4 bridge nameplates.

Four sceneries of zhanchang

This time, the old famous brand of Nanchang bridge was demolished and a new one was rebuilt. The bridge name plate is a trapezoidal structure, about 6 meters high, about 3 meters wide at the bottom, about 5 meters wide at the top, and nearly 30 cm thick. It is engraved with the name of "Nanchang bridge" and inlaid with relief. The reporter noticed at the scene that the relief contents of the four famous bridge brands are famous places of interest in Nanchang city. The south side of the east section of the bridge is Tengwang Pavilion, the north side is BaiHuaZhou, and the west section is Badashanren and rope pagoda.

The reliefs on the two bridge name plates in the east section of the bridge have been installed, and the name plates in the west section of the bridge will be installed in the next two days.

Approach bridge pile foundation

Nanchang bridge east side of the bridge to see, both sides of the bridge has been surrounded by guardrails, the scene of machinery roaring. Staff told reporters, along the river, South Avenue to Nanchang bridge overpass project includes Nanchang bridge overpass reconstruction and along the river, South Avenue Road Reconstruction two major projects. "The reconstruction of Nanchang Bridge Interchange has just started, the construction enclosure and landscape trees have been completed, and the measurement and positioning of approach pile foundation are in progress."

According to the staff, the total cost of the overpass project from Yanjiang middle and South Avenue to Nanchang bridge is 560 million yuan. The whole project aims to reduce the transportation burden of Nanchang bridge and improve the traffic efficiency of vehicles. After the completion of the project, the carrying capacity of the bridge will be greatly improved.

Additional approach bridge

The middle and South Avenue (tengwangge Changnan Avenue) along the Yangtze River in Nanchang City, adjacent to Ganjiang River in the west, is the western boundary of Changnan city. It is mainly responsible for the connection between the central area of the old city and Chaoyang new city and Xianghu new city, and is the main passage for the south entrance and exit of the old city in Changnan city.

"However, due to the lack of approach bridge of Nanchang bridge, the middle and South roads along the river can not be directly connected with it. It is necessary to get on and off the bridge near Hongcheng road and Fusheng road. Therefore, the intersection of Hongcheng road and Fusheng road of Nanchang bridge will be very congested during rush hours every day." This project related person in charge introduces.

Nanchang bridge overpass reconstruction project is mainly to add an approach bridge on the east side of Nanchang bridge to realize the interchange with the middle and south main roads along the river and improve the traffic efficiency of Nanchang bridge. Among them, the non motorized vehicle lane will be reconstructed, and the non motorized vehicles in the upper and lower reaches of the approach bridge of Nanchang bridge will be led to two auxiliary roads respectively, so as to realize the separation of motor vehicles and non motor vehicles.

Additional lanes

After the reconstruction of the interactive interchange is completed, the middle and South roads along the river will be reconstructed and expanded. According to the relevant person in charge of the project, the road reconstruction project of the middle and South avenues along the river is mainly to transform the middle and South avenues along the river into a fast lane with a driving speed of 60 km / h.

"At that time, the middle and South avenues along the Yangtze River will be reconstructed from the existing four lanes to two-way six lanes." According to the relevant person in charge of the project, as the main southward access to the old urban area of southern chang'nan City, the roads along the middle and south main roads along the river can be directly connected to the Shengmi Bridge, connecting the Chaoyang Bridge to be built in the future.

Bridge function

As a link between the two sides of Ganjiang River

Chinese PinYin : Nan Chang Da Qiao