of September 25, the world's largest single-span steel box girder suspension bridge, Ningbo Zhoushan Port Liuheng Highway Bridge Phase II Project, which was constructed by China Railway Construction Bridge Bureau and China Railway Construction Port and Navigation Bureau, successfully completed the pouring of the first floor of the right side of the main tower of Shuangyumen Bridge, marking that the bridge formally entered the construction stage of the main tower on the ground.
This is also the first pouring of the main bridge tower bearing platform, laying the foundation for the construction of the main tower body at the end of the year.
△ As the world's largest single-span steel box girder suspension bridge, Shuangyumen Bridge at the pouring
site is also the largest single-span sea-crossing bridge in China, which refreshes the maximum main span of China's sea-crossing bridges to 1768 meters at one stroke. The cable tower of the bridge adopts a rigid frame portal tower body, and the main tower on the six horizontal sides adopts 24 super-large diameter bored piles with a depth of 24 meters into the rock. The bearing platform poured this time is the first layer of the right bearing platform of Shuangyumen Navigation Bridge, with a designed concrete volume of 1592 cubic meters, which took 12 hours to complete the pouring. A single bearing platform and tower base are poured in three times, with a total pouring volume of 4492 cubic meters and a consumption of 598 tons of epoxy steel bars. It is expected that the pouring of the left and right bearing platforms will be completed as planned in late December. Around the marine construction environment, the main tower cap uses a number of special construction methods from the aspects of hole pile excavation, concrete temperature control and so on to ensure the quality of the main tower cap. The main tower on the sixth horizontal side
of Yuedao Cross-sea Quality Project
is located in the eroded rock beach and denudation dwarf hill. The stratum is mainly strong and medium weathered tuff. The rock has good integrity and high strength. The maximum compressive strength exceeds 180 MPa. The construction of the main tower pile foundation requires special equipment for large-diameter bored piles. And that requirement on the performance of the equipment is extremely high. In order to ensure the construction quality, the XR700E large rotary drilling rig is equipped on the site. Limited by the narrow site and the conflict of the working surface, the methods of jumping hole drilling and stepped reaming are adopted, which greatly improves the quality and efficiency of hole forming. After testing, 24 pile foundations are all first-class piles, which lays a foundation for building quality engineering. In
order to solve the problem of hydration heat of mass concrete in marine engineering and ensure the durability, impermeability and crack control standards of mass concrete, the project is equipped with fog gun and spraying system in the concrete raw material silo. In the process of controlling the temperature of raw materials, the construction dust is effectively restrained, and at the same time, the concrete casting temperature of the bearing platform meets the design and specification requirements by taking measures such as cooling water and adding ice to cool down; An intelligent temperature control technology is adopted, namely a thermometry element is embedded in the bearing platform, the thermometry element feeds back the real-time temperature in the bearing platform concrete to a temperature control system, and the control quality of the hydration heat of the concrete is ensured by arranging a cooling circulating water pipe in the bearing platform. The builders of the
steel "coat"
project proposed wind resistance measures for the super-large span suspension bridge in the strong typhoon sea area. In order to achieve rapid construction, the steel skeleton composite structure cable tower and the steel skeleton composite structure beam installed integrally were adopted for the first time; In order to realize the inclined rock surface and small space operation, the large-diameter pipe column foundation was proposed.In order to improve the durability of the sea bridge, the basalt fiber reinforced polymer (BFRP) grid and the new sea steel pipe pile coating system were applied.
△ Epoxy-coated reinforcement
In order to meet the durability requirements of bridge structures and temporary structures for construction, and to solve the problem of serious corrosion in the marine environment, all reinforcement in the bearing platform and tower base are epoxy-coated reinforcement. Epoxy-coated steel bars are coated with raw materials by professional coating units. After entering the site, the epoxy-coated steel bars are overhead and supported by brackets. Each bundle of epoxy-coated steel bars is separated by rubber pads and protected by protective sleeves. The steel bar processing plant realizes supermarket management. In the construction process, in order to avoid the fading and aging of the epoxy resin coating caused by ultraviolet radiation, a shading shed shall be set up on the site to minimize the amount of storage on site. The principle of "first in, first out" shall be adopted, and multiple measures shall be taken to ensure the smooth construction. The
construction workers took a group photo
and went to Chongguan. The Shuangyumen Bridge, a new landmark
in the East China Sea, is one of the most difficult bridges in the world to resist wind. Its annual effective operation time is only more than nine months. In the face of the complex construction conditions of the project: the bridge site area is windy and wavy, the water is deep and the current is swift, and the ship traffic is dense. According to the once-in-a-century design benchmark, the wind speed is up to 44.3 meters per second; high requirements for the durability of the marine environment: the project is located outside Xiangshan Port and in the southern sea area of Zhoushan, which is a typical marine environment with high requirements for the durability of the structure and strict requirements for the quality of the structural design and construction; The operation conditions of the bridge are complex, and the technical requirements for disaster prevention and mitigation are high: the bridge connects Zhoushan and Ningbo, undertakes the collection and distribution functions of Liuheng Island and Ningbo port, and has many difficulties in planning and passing dangerous chemicals.
As an important project of the second phase of the Liuheng Highway Bridge in Zhoushan Port, Ningbo, the Shuangyumen Bridge will promote the implementation of the national marine economic development strategy and the construction of a national-level new area, and further improve the external traffic conditions of the South Wing Islands of Zhoushan. It is of great significance to optimize the spatial layout of the new Zhoushan Archipelago area, build a modern marine industrial base, and realize the linkage development of Liuheng Island, Fodu Island, Meishan Island, three island port areas and industries.
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