On June 3, the first cross-stayed cable-stayed bridge in China was constructed by the Wuhan-Jiulong Railway Hubei Company, designed by China Railway Bridge Institute, and constructed by my country Railway Bridge Bureau. The world’s largest span and highest operating speed four-track railway steel box mixed-girder cable-stayed bridge ---The closure of the Bream Island Yangtze River Bridge on the Anjiu Railway.

"The Bream Island Yangtze River Bridge on the Anjiu Railway closed." At 3:30 in the afternoon, Cao Guangjing, the vice governor of the Hubei Provincial People’s Government, announced the order to close, and the construction crews welded the last 1 meter weld of the bridge, which marked the Anjiu Railway Bream Island. The Yangtze River Bridge was officially closed.

Hubei Provincial People’s Government Deputy Secretary-General Zhong Zhiqing, Jiujiang Municipal Party Committee and Deputy Mayor Jiang Wending, Huanggang Municipal People’s Government Deputy Mayor Liu Zhongcheng, Hubei Provincial Development and Reform Commission Deputy Director Pan Youcheng and other leaders attended the bridge closing ceremony. Wen Wusong, Secretary of the Party Committee and Chairman of China Railway Bridge Bureau, Liu Ziming, Secretary of the Party Committee of China Railway Bridge Academy, and other construction, design, construction and supervision units attended the closing ceremony.

The ceremony was presided over by Wang Zhijian, general manager of Wujiu Passenger Dedicated Hubei Branch.

At the ceremony, Wen Wusong introduced the construction of the bridge. He said that as a central enterprise in Hubei, China Railway Bridge Bureau has always adhered to its mission of building and developing Hubei. It has successively participated in the construction of a number of key projects in Hubei Province and Huanggang City, and contributed to the high-quality development of Hubei's economy and society. power.

Wen Wusong pointed out that since entering the site on October 28, 2017, the builders of China Railway Bridge Bureau's Anjiu Railway Bream Island Bridge have scientifically organized and carefully constructed and coordinated the promotion of safety, quality, progress and other tasks, and have defeated the construction of the project. Various difficulties and challenges. Especially last year, in the face of the sudden new crown pneumonia epidemic, the project department actively responded to the call of the Party Central Committee to "resolutely win the battle against the epidemic prevention and control", earnestly implement the "six guarantees" and "six stability" requirements, and coordinate epidemic prevention and control and construction production. , And achieved "double victories" in epidemic prevention and control and engineering construction.

Wen Wusong said that the follow-up construction tasks of the Bream Island Bridge are still very arduous, and the China Railway Bridge Bureau will fulfill its mission and make persistent efforts to complete the remaining construction tasks with high standards and high quality. At the same time, it will continue to utilize the professional advantages of the China Railway Bridge Bureau, actively participate in the construction of various projects in the provinces and cities, and continue to contribute to the construction of the fulcrum and the forefront of Hubei Province.

Liu Zhongcheng, Deputy Mayor of Huanggang City, pointed out in his speech that the Anjiu Railway Bream Island Yangtze River Bridge is an important railway channel connecting Beijing and Hong Kong, Hubei and Jiangxi, and plays a very important role in promoting the economic and social development of Huanggang City and integrating into the economic circle along the Yangtze River. . Huanggang City and China Railway Bridge Bureau have been friendly and cooperative for many years. Jiujiang Yangtze River Bridge and Huanggang Yangtze River Bridge are all high-quality projects constructed by China Railway Bridge Bureau. While actively participating in the construction of various key projects, the China Railway Bridge Bureau also provides professional support and services for the renovation of dangerous bridges in Huanggang City, road and bridge health monitoring, etc., and has become a model of "enterprise-local cooperation" in improving the transportation environment of Huanggang City. Looking forward to having more cooperation opportunities with China Railway Bridge Bureau.

Jiang Wending, the deputy mayor of Jiujiang City, said in his speech that the Anjiu Railway Bream Island Yangtze River Bridge is located at the junction of Hubei and Jiangxi provinces. The bridge builders have created a new model for the protection of the Yangtze River and a new benchmark for high-quality infrastructure. Jiang’s development of a new landmark and a new channel for the convenience and benefit of the people continued the chapter of the era of "the transformation of the sky into a thoroughfare". The completion of the bridge will provide a good transportation infrastructure for the economic circle along the Yangtze River, and promote the construction and development of the two major regional economic belts, the "Wanjiang Economic Belt" and the "Poyang Lake Economic Circle". It is hoped that all participants in the construction will continue to adhere to quality first, safety first, and use the most advanced concepts, the most applicable technology, the most scientific management, and the most stringent supervision to complete the subsequent construction tasks of the bridge to ensure that the bridge is completed and opened to traffic by the end of 2021.

The Bream Island Yangtze River Bridge has a main span of 672 meters and is designed as a double-tower double-cable-plane cross-stayed cable-stayed bridge. It is a four-lane railway bridge, two of which are high-speed rail lines with a design speed of 350 kilometers per hour; two lines are reserved for passenger and freight lines , The design speed is 200 kilometers per hour.

The main span and auxiliary span of the bridge adopt steel box girder, and the side span adopts concrete box girder. In order to improve the construction accuracy, the bridge adopts the structure of a cross-cable cable-stayed bridge, which is the first case in China. The design of the cross cable can not only improve the stiffness of the bridge and make up for the insufficient stiffness of the large-span steel box girder, but also improve the safety, stability and comfort during the operation of the high-speed rail, and it can also take into account the economy and practicability in the construction.

"Active" closure method

Generally, the bridge adopts a relatively "passive" closing method, that is, keeping the beams at both ends of the closing section in place, cutting appropriate beams according to the length of the closing section, and welding on both sides, which is greatly affected by the environmental temperature. .

The closure of the Bream Island Yangtze River Bridge is an "active" closure method that can adapt to all-weather construction. "Active" closing is to open the beams on both sides of the closing section. After the last section of the beam is hoisted, one side of the beam is welded, and then the beams on the other side of the closing section are pushed back to achieve zero-error closing. .

High linear control requirements

The bridge is a high-speed railway with a speed of 350 kilometers per hour. Regardless of operational safety and driving comfort, the requirements for the control of the bridge alignment are very high. At the same time, the bridge has a light constant load in the first phase and a constant load in the second phase, which increases the difficulty of line control.

During the construction process, the builders of China Railway Bridge Bureau adopted a series of linear control measures, including lengthening the cable anchor cup, steel beam "1+5" matching manufacturing, steel beam compression compensation, temperature field monitoring, line type and cable force For monitoring, system stiffness testing in typical phases, etc., the self-developed nonlinear spatial finite element calculation software is used to monitor the construction process in real time, ensuring the design line after completion of the bridge.

Synchronous construction control is difficult

In order to ensure the overall construction period, the construction team carried out the bridge deck ancillary engineering operations during the cantilever construction phase of the bridge; for the main span closure, active closure measures adapted to all-weather construction were adopted. The longitudinal movement of the beam body achieved zero error closure. The weight of the moving beam is about 83,000 tons, which speeds up the progress while closing the high-precision dragon, and gains valuable time for the cross-cable hanging and adjustment construction after the closing.

Tight construction period

There are 63 sections of steel box girder for the main channel of the South Branch, with a total weight of about 33,000 tons. The standard section is 18 meters long and weighs 540 tons. It uses a 650-ton girder crane cantilever. Affected by the 2020 new crown pneumonia epidemic and floods, the construction period is extremely tight. To this end, the China Railway Bridge Bureau adopted measures such as "tower column-steel beam synchronization", "steel beam-deck auxiliary synchronization" and other measures during the construction process to realize the safe cross construction of multiple work surfaces and save nearly 6 months of key lines. The construction period ensures that the bridge closes on time.

The Anqing-Jiujiang Railway is an important part of the Beijing-Kowloon High-speed Passenger Transport Corridor and the Express Passenger Transport Corridor along the Yangtze River. After completion, it will form a regional express passenger transport network with Ning’an Intercity, Changjiu Intercity, He’an Passenger Special, and Wujiu Passenger Special Lines.

As the common crossing channel of the Beijing-Hong Kong Railway and the Yangtze River Railway, the construction of the Bream Island Yangtze River Bridge will promote the construction of the "Wanjiang Economic Belt" and the "Poyang Lake Economic Circle" two regional economic belts, and strengthen the business exchanges between the city groups along the river , To promote regional common development.Editor/Baohongying