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World¡¯s longest-span HSR bridge with ballastless tracks sees fresh milestone2022-06-15 11:16:17

Chinese builders have finished pouring the pile cap for the king tower, one of the two towers used for the world’s longest-span high-speed railway bridge to be covered with ballastless tracks, in Maanshan of East China’s Anhui province.

With intense continuous pouring for 62 hours, builders from China Railway No 4 Engineering Group Co Ltd (CREC4) completed casting the pile cap on Saturday, as part of the work in building the 76-kilometer Chaohu-Maanshan Intercity Railway.

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¡¾Builders from China Railway No 4 Engineering Group Co Ltdpour the pile cap for a king towerof the world’s longest-span high-speed railway bridgeon Saturday, during work for the Chaohu-Maanshan Intercity Railway.¡¿

Maanshan, a prefecture-level city sitting on both banks of the Yangtze, the country’s longest river, borders the provincial capital of Hefei on the west. Chaohu is a county-level city under Hefei.

The HSR bridge, called the auxiliary channel bridge of Maanshan Highway-Railway Bridge on Yangtze River, is world’s largest-span HSR bridge covered with ballastless tracks, and also a river-crossing channel integrating high-speed intercity railway and first-grade highway.

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¡¾CREC4 builders work on the pile cap for a king towerof Maanshan Highway-Railway Bridge on Yangtze Riveron Saturday, during work for the Chaohu-Maanshan Intercity Railway.¡¿

The 844-meter-long bridge — a double-tower steel truss girder cable-stayed bridge — comprises of a four-lane railway and a six-lane urban expressway.

Build the bridge, which demands large-diameter bored piles on a complex terrain, large-volume dumbbell-shaped pile caps and ultra-high towers, calls for high-tech for its complex construction environment and immense reinforced concrete volume.

The dumbbell-shaped pile cap for the No F4 king tower, covering some square meters, is about the size of four basketball courts. With 6.5 meters in thickness, the pile cap was cast in two layers. The casting on Saturday, which was for the second-layer pouring, needs a concrete volume of 4,506 cubic meters.

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¡¾CREC4 builders work on the pile cap for a king towerof Maanshan Highway-Railway Bridge on Yangtze Riveron Saturday, during work for the Chaohu-Maanshan Intercity Railway.¡¿

The pile cap is an extra-sized one that is the most difficult to build and needs the largest volume of reinforced concrete with top high-tech on the whole railway line.

In order to ensure the successful pouring of the pile cap, the project department made careful arrangements for staff and equipment allocation, monitoring and testing, as well as work safety.

The Chaohu-Maanshan Intercity Railway, with five stops at Chaohu East, Hanshan, Zhengpu Port, Maanshan South and Maanshan East, and and affords trains to run at a designed speed of 350 kilometers per hour, can help better integrate the connected areas into the Yangtze River Delta region.

The Chaohu-Maanshan HSR, which officially kicked off construction on October 28, 2019, is scheduled to start operation in 2026.

Maanshan, which borders Nanjing, the provincial capital of Jiangsu, on the east, is one of the 27 key cities in the Yangtze River Delta region.

To be incorporated into the country’s “eight verticals and eight horizontals” HSR network, the Chaohu-Maanshan Intercity Railway is part of 1,985-kilometer-long Shanghai-Wuhan-Chengdu Express Corridor, which starts from Shanghai Hongqiao Station and passes through Nanjing, Hefei, Wuhan, Chongqing and other cities before ending at Chengdu East Station.