on August 10, with the roar of a large rotary drilling rig, the first ultra-deep bored pile of No.8 main pier of the Hangzhou Bay Sea-Crossing Railway Bridge of Tongsu-Jiayong Railway, which was designed by China Railway Bridge Institute and constructed by China Railway Bridge Bureau, opened the prelude to the construction of the bored pile of the main pier of the bridge.
Hangzhou Bay Sea-Crossing High-Speed Railway Bridge
Hangzhou Bay Sea-Crossing High-Speed Railway Bridge is a control project of Tongsu Jiayong high-speed rail. The bridge is designed as a double-track high-speed railway bridge with a design speed of 350 kilometers per hour. It is the longest and highest standard high-speed railway cross-sea bridge in the world. After completion, it will set many world records, which is a milestone in the field of railway bridge construction in the world. The total length of
Hangzhou Bay Sea-Crossing High-speed Railway Bridge is 29.2 kilometers, including three channel bridges in the north, middle and south and approach bridges across the levee, sea and shoal areas. It is a super-long high-speed railway bridge cluster project. The main span of the North Channel Bridge is 450 meters. After completion, it will become the world's largest span ballastless track steel box-steel truss composite girder cable-stayed bridge with double towers and double cable planes.
North Channel Bridge
North Channel Bridge is located at the estuary of Qiantang River. Affected by the world-famous "Qiantang River Tide", the highest tide level at the construction site is 6.13 meters, the lowest is only -3.76 meters, and the impact force is 2.7 tons. There are 52 bored piles in the No.8 main pylon pier. The No.10 pile is constructed this time, with a length of 129.5 meters, a diameter of 2.5 meters and a drilling depth of 151 meters. It is the deepest bored pile foundation in the world at present. The silt and sand layer in the stratum is thick, so it is difficult to form holes and piles, and the pile body is grouted after the pile foundation. In order to ensure that the drilling inclination is not more than 1/150, China Railway Bridge Bureau has developed a SWDM800 large rotary drilling rig with a maximum drilling diameter of 4.5 meters and a drilling depth of 155 meters. The inertia rotary platform is used to ensure the stability of the drilling rig during the drilling process. At the same time, the mast angle inclination sensor is set to monitor the verticality of the drilling in real time. The Project Department of
China Railway Bridge Bureau has held several symposiums to continuously optimize the construction organization, elaborate the construction plan, update the drilling equipment, strengthen technical guidance and engineering management, strictly control the quality of raw materials, construction procedures and processes, and ensure the smooth and controllable construction technology design, construction management, quality standards and safety assurance. It lays a solid foundation for the smooth drilling of the first pile of the main pier.
The Suzhou-Jiaxing-Ningbo High-speed Railway is an important part of the coastal corridor of the national "eight vertical and eight horizontal" railway network. The line starts from Nantong West Railway Station in Nantong City, runs through the main line of Yantong Railway, crosses the Yangtze River southward, crosses Hangzhou Bay through Suzhou City and Jiaxing City, and enters Ningbo City. It is an important backbone line of the Yangtze River Delta urban agglomeration. After the completion of Tongsujiayong high-speed rail, Ningbo to Suzhou and Shanghai will form a "one-hour traffic circle", which is of great significance for promoting the formation of a new pattern of comprehensive opening up of coastal corridors, building a world-class urban agglomeration in the Yangtze River Delta and serving the overall situation of coordinated economic and social development in the Yangtze River Delta region.
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