On the evening of October 19, 2021, the two-turning continuous beams of the No. 1 bridge of the Guinan High-speed Railway Hechi Moving Freight Base Linked Line slowly "turned around" at an altitude of 13 meters and reached the designated bridge position, which marks the minimum curve radius of the domestic electrified railway The turning of the turning bridge was successfully completed, and the turning beam project of the Guinan High-speed Railway was fully completed.
The No. 1 bridge of Guinan High-speed Railway Hechi Moving Freight Base Link Line is 270 meters long and spans the existing Guizhou-Guizhou Railway. The Qiangui Railway has an average of one train passing every 20 minutes, and the traffic is heavy. Therefore, the Guinan High Speed Railway only has less than 2.5 hours of skylight time without train operation every day for construction. If the traditional bridge construction method is adopted, it will not only affect the normal transportation order of the Guizhou-Guizhou Railway, but also may cause the construction progress of the Guinan High-speed Railway Bridge to lag behind.
In order to reduce the impact of construction on the transportation of the Guizhou-Guizhou Railway, the builders poured beams on both sides of the Guizhou-Guangxi Railway. Through horizontal double-turn construction, the beams were synchronously rotated to the top of the railway, and then protected by steel shells. The way to carry out the mid-span closure.
The total span of the two swivel beams is 48 meters, each weighing 2,000 tons. According to the route design, the Guinan High-speed Railway just turns here, and the curve radius of the route is only 300 meters, making the bridge here the smallest turning bridge with the current domestic electrified railway curve radius. In addition, due to the large curvature of the beam body, the center of gravity will deviate from the center of the pier when turning.
In order to ensure the smooth construction of the rotation, the construction unit carried out a large number of data calculations in the early stage, and deployed high-level measurement control networks and precision instruments, and used building information modeling to simulate possible problems in advance, and formulate corresponding solutions to ensure the bridge rotation. Precision and smoothness.
After the successful rotation of the bridge, the technical problems of the control bridge engineering of the Guinan high-speed railway line have all been solved. Up to now, the overall progress of the bridge project in the Guangxi section of the Guinan High-speed Railway has reached 86%.
The Guinan High-speed Railway runs through northwestern Guangxi and southeastern Guizhou. It is the first high-speed railway in Guangxi with a design speed of 350 kilometers per hour. It is also an important part of the new north-south road linking the Belt and Road. The new pattern of open development of Beilian, Dongrong, and Western Cooperation is of great significance. This line is expected to be fully operational by the end of 2023. By then, the train running time from Nanning to Guiyang will be shortened to more than two hours, which will greatly facilitate the people along the line to travel. Editor/He Yuting
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