China News Service, Beijing, May 8 (Lu Jing, Wang Xiaochuan, Wang Guansheng) In the early morning of May 8, after nearly one hour of closed construction, two 10,000-ton T-shaped bridge piers distributed on both sides of the Beijing-Guangzhou Railway slowly moved counterclockwise. After turning 33 degrees, it will close above the Beijing-Guangzhou Railway, which marks the successful rotation of the Beijing-Guangzhou Bridge, a key control project of the Fengtai Station Reconstruction Project in Beijing, and has laid a solid foundation for the Fengtai Station Reconstruction Project to be opened to traffic within this year.
At 0:50 on the 8th, as the railway "construction skylight" opened on time, two 10,000-ton T-shaped piers distributed on both sides of the Beijing-Guangzhou Railway were driven by jacks to rotate counterclockwise at the same time.
According to Wang Yuqing, chief engineer of the Fengtai Station Project Management Department of Beijing Municipal Group Corporation, the Fengtai Station Reconstruction Project is the first large passenger station in China that uses high-speed and normal-speed passenger depots with overlapping arrangements. Among them, the Beijing-Guangzhou Bridge is a key control project for the entire line. It is 4351 meters long and spans the busy Beijing-Guangzhou railway, which is known as the "South-North Railway Traffic Artery". On average, about 114 trains pass by each day.
Wang Yuqing said that in order to minimize the impact on train operation, the design adopts the “build first and then turn” technology. The beams are constructed by the hanging basket cantilever method on both sides of the railway. The 2-meter closure section realizes closure.
Tian Guobin, the head of the Fengtai Project Department of China Railway 14th Bureau Group, introduced that in addition to facing higher safety risks, because the rotating position is at a variable slope point, the radius of the curve is small, the longitudinal slope is large, the tonnage of the rotating body is large, and the closing accuracy is high. The construction is facing many tests.
In order to ensure that the process of turning is foolproof, before turning, they accurately weighed the bridge body, calculated the accurate position of the counterweight, and ensured the balance of the forces at both ends of the beam; through trial rotation in advance, tracking and monitoring, it is the official implementation of the turning Provide the main technical parameters and reliable guarantee, and set up a booster system and limit device to prevent insufficient rotation or over-line.
Since the closing point is located above the Beijing-Guangzhou Railway, they adopt advanced "steel shell closing" technology. The steel shell is designed as a permanent structure, which is poured together with the beam concrete and used as a template for the closing section after the swivel is in place, effectively avoiding the traditional During the use and dismantling of the hanging basket closure process, the occurrence of debris falling, damaging the existing line equipment, endangering the safety of railway running, etc. will minimize the impact on the existing line.
It is reported that after completion, Beijing Fengtai Station will undertake the start and end operations of the Beijing-Guangzhou High-speed Railway, Beijing-Hong Kong-Taiwan High-speed Railway, Fengsha, Jingyuan, Beijing-Shanghai, Beijing-Kowloon-Pujiang Express Line, and suburban railways. The deep integration of Beijing railway hubs such as Beijing Railway Station, Beijing North Railway Station, Beijing West Railway Station, and Beijing South Railway Station plays an important role in optimizing the capital's transportation structure, improving the capital's comprehensive transportation system, facilitating people's travel, and driving social and economic development.
China Railway Beijing Bureau Group Co., Ltd. stated that Xinfengtai Railway Station, as an important part of the national “eight vertical and eight horizontal” high-speed railway network planning, Beijing-Hong Kong corridor, the start and end of the Beijing-Xiongshang high-speed railway will also provide support for the construction of the Xiongan New Area It is a strong guarantee to further improve the Beijing-Tianjin-Hebei on the track and effectively help the coordinated development of Beijing-Tianjin-Hebei.