The completion of Jiujiang Yangtze River Bridge is another new milestone in the history of bridge construction in China after Wuhan Yangtze River Bridge and Nanjing Yangtze River Bridge, with a total length of 7675 meters.
Jiujiang Yangtze River Bridge is the eighth bridge built by China on the Yangtze River. Before Wuhu Yangtze River Bridge was opened to traffic in 2000, Jiujiang Yangtze River Bridge was the longest and largest railway and highway bridge in China. Jiujiang Yangtze River Bridge was completed in June 1993 65438+ 10/6. It is the "natural moat passage" of Beijing-Kowloon Railway and Hejiu Railway, and it is a double-track railway and highway bridge.
Jiujiang Yangtze River Bridge is not only in China, but also the longest steel truss bridge with railway and highway functions in the world. It is not only the main artery of north-south traffic in China, but also the most striking and famous tourist attraction in Jiujiang.
form
Jiujiang Yangtze River Bridge is a double-deck and double-track railway and highway bridge, which consists of the main bridge and the highway and railway approach bridges on the north and south sides.
Building structure
Among them, the length of the main bridge on the river is1806m, the pier is 10, and the steel beam is 1 1. Regardless of the length and span of160m ordinary steel truss beam, the main groove is a three-hole rigid truss and a flexible arch, the truss height is16m and the span is 65438+. Made of 15 Mn, Ba, v, n high-strength low-alloy steel, the maximum thickness of the steel plate is 56 mm, and the steel beam members are riveted with high-strength bolts with a diameter of 27 mm.
Zheng Qiao Highway is on the upper floor, beyond the range of three arches. The roadway width is 14m, and sidewalks with a width of 2m are set on both sides. The carriageway of part of the three arches is 1 1m, and there are 3.75m motorways and 1m wide sidewalks outside the arches.
The railway is on the lower floor, with a double-track spacing of 4.2m The railway is medium live load (the prestressed box girder is medium-26). The highway is designed according to steam -20, and checked with-100; The population is 3.5KN/m2. Navigation clearance height is 24.0m, clear width 160.0m, and it is arranged in three holes. The earthquake is fortified according to the design intensity of 7 degrees.
Main bridge steel beam *** 1 1 hole, all steel beams are bolted. Total length of main bridge 1806.7 12m, pier in the middle of the river 10, abutment on both banks 1,/kloc-0 1428.444m；; On the south bank of the railway approach bridge. The north bank is 4440.934m, and the total length of the railway section is 7676.09m The approach bridge adopts 40m simply supported prestressed concrete box girder without ballast and sleeper. 2 box girders per hole. The approach length of the south bank of the highway approach bridge is 1347.02m, that of the north bank is 1306.389m, and that of the highway part is 4460. 122m, all of which are 40m prestressed concrete T-beams with 8 pieces for each hole.
Important significance
Jiujiang Yangtze River Bridge,1973 65438+Survey and design by Bridge Engineering Bureau of Ministry of Railways in February.
Jiujiang Yangtze River Bridge is the eighth bridge built by China on the Yangtze River after Wuhan Yangtze River Bridge, and it is also the longest railway and highway bridge in China.
Whether it is design, construction technology or the use of new building materials, it reflects the most advanced level of bridge construction in China. The whole bridge is novel in design, beautiful in shape, unique in technology and magnificent. It is the first time in the history of bridge construction in China that the prestressed box girder without ballast and sleeper is used in the railway approach of this bridge. The main river has a large span and a width of 216m, ranking first among bridges in China.
Jiujiang Yangtze River Bridge is the "natural moat thoroughfare" of Beijing-Kowloon Railway and Hejiu Railway, and it is a double-track railway and highway bridge.
Jiujiang Bridge is not only in China, but also the longest steel truss bridge for railway and highway in the world. It is not only the main artery of north-south traffic in China, but also the most striking new tourist attraction in Jiujiang.
1992 Jiujiang bridge was officially completed and opened to traffic, and 1995 railway bridge was connected.
After the bridge is opened to traffic, it will become the hub of Beijing-Kowloon Railway, which is of great strategic significance for strengthening the north-south traffic in China and promoting economic construction, cultural exchange and tourism in East China and Central South China.
The new steel grade 15 Mn-Ba-N, which was first tested in China, was used on this bridge for the first time.
The building materials used in this bridge, such as steel, cement and wood, have set a record in the history of bridge construction in China.
The distance from the top of the pier of Jiujiang Bridge to the lowest bottom of the foundation is 64 meters, which is equivalent to a 22-story building. From the steel beam vault to the lowest bottom of the foundation, it is as high as 132 meters, which is equivalent to a 45-story super high-rise building.
The geological conditions in Jiujiang waters are complex, the water depth is turbulent and the construction is difficult. A series of new technologies and processes, such as double-wall steel cofferdam, sinking of slurry casing and air curtain, have been adopted by the construction unit in foundation engineering, which has ensured the engineering quality and won high praise from Mao Yisheng, a famous bridge expert.
Initiated the "Construction Method of Large Diameter Bored Foundation of Double-wall Steel Cofferdam";
For the first time, the construction technology of "thixotropic mud sleeve" and "air curtain" is applied to the caisson foundation of the main bridge and approach bridge with a sinking depth of 50m;
The reverse circulation rotary drilling rig with a diameter of 2.5m was successfully trial-produced for the first time in China and used in bridge construction.
The rigid beam of the main bridge adopts 15MnVNg low-alloy high-strength steel, and the bolted structure replaces the riveted structure.
180m steel truss girder is first installed with double-layer sling frame full extension arm;
The flexible arch closure technology of 2 16m long-span middle closure is adopted for the first time.
A new type of mass tuned damper (TMD) is used for the first time in China to suppress the vibration of suspenders of three arch bridges.
It is the first time in China to erect a railway box girder with a span of 40m with a self-designed and manufactured bridge erecting machine with a crane weight of 300 tons.
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