Wanjiali Road Fast Transformation of the North Extension Line Top Lift Project Construction was launched

The rapid transformation of Wanjiali Road, which is under construction, will be connected with the existing Wanjiali Road viaduct to achieve the entire process without red and green lights.

But how does one new two bridges be connected?

Bleak

On August 3, on the elevated area of ​​Wanjiali Road, as the 73 large jackpot made the same force at the same time, the existing two -united 5 -cross and a total weight of 9255 tons of Wanjiali Road elevated bridge began to rise slowly. A shocking scene was staged at the construction site. In the next month, this 150 -meter -long bridge will be raised by 0 to 5.4 meters to achieve the "dragon's head". After the original bridge pier is "broken bone increase", the old bridge that completes the top rise will be in the air " "Holding hands" and continuing to be extended north. It is reported that this is currently the largest bridge top upgrade project in Hunan Province.

On August 3, Wanjiali Road, built by the Fifth Bureau of China Railway, the rapid transformation of the North Extension Line Project, which has the beginning of the construction of the Wanjiali Road Viaduct, laid the foundation for the early opening of the project.

1 Design: After the old bridge is promoted to the newly -built viaduct air, "in line" according to the plan. According to the plan, Wanjiali Road quickly changed the starting point of the North Extension Line to Fuguan Road, and connected the built Wanjiali Road viaduct. The north extends to Henan Road. The entire line adopts an elevated form, and it is connected to the existing Wanjiali Road elevated through the top upgrade. The line is 4.275 kilometers in length. From April 16 this year, the section of Wanjiali Road elevated garden intersection to the Shitang intersection was adopted to take closed construction control, which was to prepare for the top upgrade construction. Wang Xiong, chief engineer of the Wanjiali Road Project of China Railway Fifth Bureau, introduced that the Wanjiali Road Viaduct has been opened to traffic for 7 years. In order to ensure that the new viaduct of the North Extension Line is fully connected with the existing bridge, two methods can be used. One is to remove the newly built, and the other is that the upper structure is raised and the lower structure pier column is high. Through repeated discussions and comparisons, the project finally decided to use the top upgrade process construction. "Compared with the bridge demolition, the top upgrade transformation can not only save the economic and time cost of construction, but also the construction is more environmentally friendly, which can reduce the surrounding environment and transportation. influences". Wang Xiong explained that the so -called bridge top rise refers to the operation process of using the hydraulic jack to raise the upper structure of the bridge as a whole. For the first time in Changsha, such a large amount of bridge is up to the first time in Changsha. It is necessary to put the maximum top of the floor bridge with a length of 150 meters 5.4 meters, and then build the bridge pier for the bridge pier. After the construction of the bridge pier Finally, the construction of the "Old Bridge of the Old Bridge" of the Wanjiali Road Viaduct was completed, and prepared for the "integration" of the two -way six -lane viaduct air in the air. "The jack is the equipment that we often use for the uplet of the car chassis. It can obtain dozens of times the output of dozens of times through the provision of smaller power to play the role of 'four or two pounds'. Get a huge 'divine power'. "Wang Xiong said that the top -lifting construction has a total of 3 hydraulic pump stations and 6 follow -up pump stations, including 73 100-300 tons of jacks. To meet the needs of the overall simultaneous promotion slope construction and control.

2 Construction: The problem of overcome series of difficulties "The scale of the top upgrade is large, and the height of the ramp is high to ensure the safety, reliable quality, and high standards of the top upgrade process." Shen Zhi, executive deputy manager of the project, told reporters that the first step of the construction is the top of the bridge deck, the second step is to increase the bridge pier, and the third step is to install the bridge deck on the bridge pier. It is difficult to do. "The top upgrade itinerary, the duration of the top upgrade, the large number of equipment such as the top, the difficulty of the control, the difficulty of control, the upper structure for a long time in the suspended state, and other factors, it has become a series of difficult problems that need to be overcome during the construction process." He said. Shen Zhi introduced that during the rise of the top, the bridge deck rose about 3 mm per minute. It adopted the "overall synchronization top upgrade and step -by -step" method. It takes more than 20 days from the beginning to the full top rise in place. After the bridge surface is in place, the pier columns will be carried out in 3 months and the construction of the bridge will be carried out in 3 months. It is expected that at the end of November, the new and old elevation will be seamlessly connected. The error must be controlled within 1 mm.

Source 丨 Palm on Changsha reporters 丨 Chen Huanming Correspondent 丨 Luo Jian Single Single Intern 丨 Editor Xiao Wenqi 丨 Wen Chunyan School Mathematics 丨 Reich Audit 丨 Du Jin

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