China News Service, Fujian, September 24 (Lin Tao and Yang Cunxing) At 1:28 on the 24th, the new Fuzhou-Xiamen Railway Xixi Bridge, which was built by China Railway Fourth Bureau, crossed the Hangzhou-Shenzhen Railway Swivel Bridge and successfully turned.
Relevant staff said that this is currently the longest span and heaviest continuous beam swivel project of its kind in China.
The Hangzhou-Shenzhen Railway is currently one of the busiest trunk lines in China's railway transportation, with an average of one train passing by in 5 minutes.
The newly built piers 68 and 69 of the Xixi Bridge on the Fuxia Railway cross the Hangzhou-Shenzhen Railway. The construction directly above the railway is difficult and risky.
In order not to affect the normal operation of existing railways, China Railway Fourth Bureau adopts the current domestic advanced cross-railway construction technology and the rotating bridge technology, adopts the construction method of "build first and then transfer", first construct the open space on both sides of the Hangzhou-Shenzhen railway, and wait for the bridge After the superstructure is completed, it will be rotated across the Hangzhou-Shenzhen Railway.
The picture shows the newly-built Xixi Bridge on the Fuxia Railway before turning. Chen Zhen
The newly-built Xixi Bridge on the Fuxia Railway crosses the Hangzhou-Shenzhen Railway with double-spread synchronous swivel bridges. A single swivel bridge is 168 meters long, equivalent to 54 stories high, weighs 19,000 tons, and double-spreads weighs 38,000 tons. The hour hand rotation is 24 degrees and 21.1 degrees, which is the longest span and heaviest continuous beam rotation project of its kind in China.
At 23:35 on the 23rd, with the command of the site commander, the swivel bridge of the Xixi Bridge slowly rotated clockwise at a speed of 1 meter per minute. The on-site staff monitored the rotation in real time, and arranged the number according to the scale on the turntable. , Speed sensor and camera, real-time monitoring and adjustment of the rotation speed, which effectively guarantees the accurate rotation of the rotation.
After 113 minutes of intense construction, the newly-built Xixi Super Bridge of Fuxia Railway crossed the Hangshen Railway Swivel Bridge and successfully turned.
The main piers of No. 68 and 69 of Xixi Bridge adopt round-end double-limbed thin-walled piers. This is the first case in the construction of the main piers of high-speed rail rotating bridges in the country. It plays a role in increasing the rigidity of the pier and improving the aesthetics of the bridge. The technical gaps in the construction of double-limbed thin-walled piers of swivel bridges provide reference for similar domestic bridge construction.
The picture shows the photo by Lu Jianjian of the newly built Xixi Bridge on Fuxia Railway before the rotation
As a rare high-speed rail double-width large T-structure swivel beam structure in the country, China Railway Fourth Bureau makes full use of BIM technology to simulate the construction process of pile foundations, spherical hinges, substructures, and upper structures to ensure the installation and traction of the spherical hinges of the swivel A series of construction procedures such as system, bearing reaction system, and rotating construction were completed accurately.
At the same time, an intelligent real-time visual monitoring system is adopted during the construction of the rotating beam to monitor the key cross-sectional stress of the rotating beam, bridge end displacement, rotating speed, spatial position, wind speed, wind force, traction and other related parameters in real time, and grasp the rotating in real time The working condition of the beam greatly improves the safety of rotating construction.
"The Xixi Super Bridge crossed the Hangshen Railway Swivel Bridge and successfully turned, opening up the girder channel of the Fuxia High Speed Rail Xixi Bridge towards Fuzhou, laying a solid foundation for the opening of the Fuxia High Speed Railway in 2022." China Railway Fourth Bureau Said Chen Liang, project manager of the 8th bid of Fuxia Railway.
The new Fuzhou-Xiamen railway is a key project of the “Belt and Road” construction and the country’s first cross-sea high-speed railway. It starts from Fuzhou in the north, passes through Putian and Quanzhou, and reaches Xiamen and Zhangzhou in the south. The total length of the line is 277.42 kilometers, and the design speed is 277.42 kilometers per hour. 350 km/h.
After the completion of the Fuzhou-Xiamen Railway, the space-time distance between Fuzhou, Xiamen, Quanzhou, and Zhangzhou will be shortened. Xiarongning will form a one-hour traffic circle, and Xiazhangquan will form a half-hour traffic circle to promote the rapid development of the Haixi city group.