In the early morning of October 27, the main bridge of the cross-railway overpass on Guangming Road in Langfang City was successfully turned. Photo by Chen Tong
Langfang, China, October 27 (Song Mintao, Wang Yangyang) At about 3:30 a.m. on the 27th, the first high-speed rail truss bridge in China that crossed the Beijing-Shanghai high-speed railway and the Beijing-Shanghai railway at the same time was successfully transformed. This is the first time in the construction of the high-speed rail truss girder bridge project in China, which provides valuable experience for the high-speed railway project of china's upper span operation.
At night, two steel truss girder bridges with a total weight of 30,000 tons, under the traction of four 500-ton jacks, lasted nearly 2 hours, synchronously rotating 33.4 ° and 29 ° counterclockwise, and successfully merged. The main span of 268 meters in Langfang Guangming Road crossed the railway bridge to achieve the upper span of the Beijing-Shanghai high-speed railway, the existing Beijing-Shanghai railway and the long-term planning railway.
In the early morning of October 27, before the turnaround of the main bridge of the cross-railway overpass on Guangming Road in Langfang City began, the staff conducted a final inspection of each part. Photo by Chen Tong
The biggest difficulty in the construction of the overpass project is to cross the main bridge across China's busiest high-speed rail "north-south artery" - the Beijing-Shanghai Line and the Beijing-Shanghai Railway, which need to cross a total of 11 railway tracks between the high-speed rail Langfang Station and the Langfang North Railway Station at the same time, and complete the transformation of Helong over the two major railway "arteries". Since there was no reference case to refer to before, since accepting the task, the Beijing Bureau of China Railway and the Langfang Municipal Government have organized several special meetings to study and improve the planning and design plan, and all relevant departments have actively coordinated and coordinated and worked together to ensure that the project was started and smoothly advanced as scheduled.
"After several rounds of scheme competition and several rounds of industry expert review, the design team finally selected the upward stiff continuous steel truss beam with large vertical stiffness of the main span, beautiful linear shape, little maintenance in the later stage, and the least impact on the railway, to complete the first case of bridge rotation of the upper span operation high-speed rail in China." Xue Xianzheng, chief engineer of the EPC general contracting project of China Railway Fifth Survey and Design Institute Group Co., Ltd. (hereinafter referred to as China Railway Fifth Institute), said that in order to reduce the construction of railway interference and ensure the safety of high-speed rail operation, the design adopted the "first build and then transfer" process.
In the early morning of October 27, when the main bridge of the cross-railway overpass on Guangming Road in Langfang City was turned around, the staff monitored in real time on the construction monitoring console. Photo by Chen Tong
"The complexity, accuracy and technical difficulty of the project have reached the highest standards of bridge design and construction, and the total weight of the left and right two-way span bridge body has reached 30,000 tons, and the rotation accuracy needs to reach the millimeter level during the 'window period' of only two hours of the busiest high-speed rail." Zhao Yubao, project manager of China Railway Sixth Bureau Group Co., Ltd. (hereinafter referred to as China Railway Sixth Bureau), said that before the turnaround, the project department conducted a test transfer, comprehensively tested the accuracy of the parameters of the transfer body, as well as the structural stability of the beam body. According to the characteristics of the beam type, the construction process and the construction requirements of the adjacent high-speed rail, the follow-up is carried out through the fine control of safety and quality and the monitoring and monitoring, which ensures the construction quality and puts a "safety lock" for the installation accuracy.
The project is invested and constructed by the Langfang Municipal Government of Hebei Province, the EPC general contractor of the Fifth Hospital of China Railway, and the construction of the Sixth Bureau of China Railway. The new turnaround system supported by the project management team for this project, Helong technology, high-speed rail deformation analysis, and the whole process of intelligent construction scheme based on BIM technology have reached the industry's original or international leading level, and the first version of the design and construction of high-speed rail truss girder bridge design and construction technology has been formed, which will provide valuable reference for China's upper span operation high-speed railway project. (End)
Source: China News Network