Taizhou Yangtze river bridge is located between Taizhou city, Zhenjiang city and Changzhou city in Jiangsu province, 57km east of Jiangyin Yangtze river highway bridge and 66km west of Runyang Yangtze river highway bridge. It is an important part of the "five verticals, nine horizontals and five links" expressway network in Jiangsu province and the national "Outline of Modern Highway Waterway Traffic Planning in the Yangtze River Delta Region", and it is also one of the 11 highway crossing channels planned and constructed in Jiangsu province. Taizhou Yangtze River Bridge is located in the middle of the Jiangsu section of the Yangtze River, directly connecting three national expressways, namely, Beijing to Shanghai, Shanghai to Xi 'an and Shanghai to Chengdu. It plays an important liaison and auxiliary role in the expressway network in the Yangtze River Delta region and Jiangsu Province.
The total length of the project is 62.88km, and the standard of two-way six-lane expressway is adopted. The total investment of the project is 9.37 billion yuan, and the three-tower double-span steel box girder suspension bridge with a main span of 2× 18m is the first in the world. Among them, Taizhou Yangtze River Highway Bridge is about 7 kilometers long, connecting Taizhou city on the north bank of the Yangtze River with Yangzhong city in the center of the Yangtze River and Zhenjiang city in the south of the Yangtze River, and connecting Shanghai-Nanjing Expressway and Changzhou West Ring Expressway through wiring.
On May 12th, 216, the unveiling ceremony of the 214 Outstanding Structural Engineering Award of the International Bridge and Structural Engineering Association was held at the Taizhou Bridge site. The award of Taizhou Bridge is the third project in China to win this honor after Lupu Bridge and Water Cube.
construction background
in the past 1 years since 199, the demand for cross-river traffic in Jiangsu section of the Yangtze River has increased rapidly, with an average daily traffic growth rate of 11.2%, and the daily cross-river traffic has reached nearly 2, vehicles, most of which pass through various "Yangtze River Bridges". The increasing demand for river-crossing traffic calls for more quick passages. However, in Taizhou section of the Yangtze River, cross-river traffic mainly depends on several ferry crossings, such as Gaogang, Qiwei, Huangtian Port and Chiffon Port, or bypasses Runyang Bridge and Jiangyin Bridge, which is difficult to meet the needs of social and economic development, especially the development along the Yangtze River.
if vehicles in Yancheng and Taizhou want to go to Zhenjiang and Changzhou, most of them can only take Runyang Bridge or Jiangyin Bridge, and the path is not straight enough, which increases the detour distance for this part of river-crossing traffic and leads to the inefficiency of the overall road network. It takes at least one and a half hours to drive from Taizhou to Changzhou. It is even more inconvenient to go to Nanjing and Hangzhou.
Although Jiangyin Bridge and Runyang Bridge were completed in p>1999 and opened to traffic in 25, they still can't meet the transportation demand, and the traffic is still inconvenient. Taizhou people still take a detour to Changzhou and Zhenjiang, and they have experienced four times of crossing the river, such as calling for boats, steamboats, ferry crossing and bridges.
Bridge design
Taizhou Yangtze River Bridge is another super-long-span bridge in Jiangsu Province after the successful construction of Jiangyin Bridge and Runyang Bridge. The total length of the project is 62.88 kilometers, and the whole line adopts the standard of two-way six-lane expressway. The total investment of the project is 9.37 billion yuan, and the construction period is five and a half years. Among them, the main bridge across the river and Jiajiang Bridge are 9.726 kilometers long and the bridge deck is 33 meters wide. The main bridge across the river adopts a three-tower double-span steel box girder suspension bridge with a main span of 2×18 meters, which is the first in the world.
Building structure
The multi-tower suspension bridge is an innovative structural system. Based on the characteristics of multi-tower multi-span suspension bridge, the tower foundation of Taizhou Yangtze River Highway Bridge is a rectangular open caisson with rounded corners, which is huge. The lower part of the open caisson is 38 meters of double-walled steel shell concrete structure, and the upper part is 38 meters of reinforced concrete structure. It is divided into 12 compartments on the plane, and about 1, cubic meters of concrete needs to be poured, which will eventually sink into 19 meters of deep water and 55 meters of riverbed cover.
The main part
Bridge middle tower structure
Because of the stress characteristics of both rigidity and flexibility, the middle tower chooses the longitudinal herringbone and transverse portal frame steel tower structure, which has large geometric size and weight and requires high manufacturing accuracy. The middle tower has a total weight of 13, tons, and a large number of high-strength thick steel plates are used, of which 69.5% are made of Q42qD high-strength steel plates, more than 57.8% are 5 to 6 mm thick, and the thickest steel plate is 15 mm thick, so it is very difficult to ensure welding quality and control welding deformation. The steel tower column is a rectangular structure with variable cross-section and tangent angle, the maximum cross-section is 5.×12.69 meters, and the maximum segment length is 15 meters. According to the requirements of stress and alignment, the dimension tolerance of sectional cross-section in transverse and longitudinal bridge directions is 2mm, the allowable error of diagonal difference and distortion is not more than 3mm, the flatness of the whole section is ≤ .25mm, the verticality of end faces in transverse and longitudinal bridge directions of tower sections is ≤1/1, the metal contact rate of wall plates and webs between tower sections is ≥5%, and the metal contact rate of longitudinal ribs is ≥4%.
The middle tower adopts longitudinal herringbone and transverse portal frame steel tower, and its large-section manufacturing and installation technology is the first time in China.
The bridge hoisting design
adopts the scheme that the lower tower column segment is installed by floating crane, and the upper tower column segment is vertically divided and hoisted by MD36 tower crane. The hoisting weight of each hoisting segment of the upper tower column is controlled within 14 tons, and the height of the corresponding segment is controlled within 7.5 to 12 meters. The correct positioning and installation of D segment is the basis of the installation and linear control of the whole tower body, and its installation accuracy will determine the installation accuracy of tower column. There are ***4 D segments with two-way inclination. There are 34 holes with diameters of 2mm and 18mm on the bearing plate and the top plate at the bottom of each segment. During installation, the same number of bolts with diameters of 13mm (the diameter of threaded parts at both ends is 14mm) should be inserted into the corresponding circular holes of the bottom plate and the top plate of the steel tower column at the same time. In the process of "perforation", the steel tower column needs to be adjusted to the gradient of 1:4 in the longitudinal direction and 3.9:192 in the transverse direction, and the deviation should not exceed 2 mm, so the installation and positioning accuracy is very high.
Bridge cable system
Compared with the traditional two-tower suspension bridge, the cable system of the three-tower suspension bridge is more complicated. First, it is difficult to design and construct the catwalk, and the influence of the structural behavior of the middle tower on the catwalk structure should be considered, and the reserved embedment of the catwalk crossing the top of the tower is restricted by the steel tower structure. Second, the cable erection condition is more complicated, and the main cable strand needs to cross the top of the tower for three times during the erection process, so the cable strand is more likely to produce bad phenomena such as broken belt, drum wire, torsion and hula hoop, which puts forward higher requirements for traction equipment and cable release system.
The north-south anchorage foundation
adopts a rectangular open caisson foundation with strong bearing capacity, with the length and width of 67.9 meters and 52 meters respectively. The north anchorage open caisson is 57 meters high and the basement elevation is -55. meters, while the south anchorage open caisson is 41 meters high and the basement elevation is -39 meters.
steel bridge deck structure
Taizhou Yangtze River Highway Bridge is a three-tower multi-span suspension bridge. Because both sides of the middle tower are long-span flexible cable systems, the overall stiffness is lower than that of the traditional suspension bridge, so it is designed to be super-long and super-flexible steel bridge deck structure, which intensifies the flexibility of the bridge deck system and leads to the complex structural behavior characteristics of the bridge deck system.
paving materials and technology
due to the adoption of super-long and super-flexible steel bridge deck structure, the large deformation characteristics of super-long and super-flexible bridge deck system require the pavement system to have good deformation compliance, which puts forward higher requirements for the modulus optimization of pavement structure and new requirements for the material performance and construction technology of bridge deck pavement.
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