Key technologies for design and construction of deep-buried capping cofferdam in the confined water layer area of the Yellow River Basin

The Anluo Yellow River Expressway Bridge is a (110+135+520+135+110) m double-tower double- cable plane composite beam cable-stayed bridge, The main pier cap adopts the separated octagonal cap, The outer outline size of a single bearing platform is 35.6m×32.1m, the thickness is 6.0m, and it is buried 12.2m underground. The cofferdam adopts PLC combined pile[1] structure, the outer contour size is 38.6m×35.1m, and three support systems are set up. About a series of problems for platform, such as: a long period of platform construction, high risk of sudden surge in foundation pits, high safety risk of cofferdom process conversion, high risk of temperature control in the construction of mass concret. Moreover, this deeply buried platform located in the Yellow River Basion pressurized water layer., through the calculation and design of Visual modflow software, a single cofferdam is set with 12 dewatering wells and 1 observation well for continuous dewatering to improve the anti-surge stability of the foundation pit; use MIDAS software to simulate the working conditions of each process of cofferdam construction to reduce the safety risk of process conversion, and it is calculated that the strength, stiffness and embedded stability of each component of the cofferdam can meet the design requirements.

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