Underwater tunnel vertical jacking solid construction method and structure suitable for hard stratum

Abstract

The invention discloses an underwater tunnel vertical jacking solid construction method and structure suitable for a hard stratum. The implementation process comprises the steps that 1, an offshore construction platform is built, and a steel casing is driven into the hard stable stratum in the offshore platform; 2, drilling is conducted under protection of the casing to replace the hard stratum of a vertical pipe jacking area; 3, a shield tunneling method is adopted for tunnel construction, and a seabed main tunnel is built to the position below the jacking area; 4, a vertical pipe is vertically jacked to the sea area section by section through the replaced stratum in the main tunnel; 5, the steel casing is connected with an upper steel structure diffusion structure; and 6, the main tunnel is filled with water, a vertical pipe sealing cover is opened, and the sea area and the main tunnel are connected to achieve the water taking / draining function. The underwater tunnel vertical jacking solid construction method and structure can be well suitable for hard soil, rock stratums and other geological conditions, construction is convenient and safe, the manufacturing cost is economical, the construction period can be shortened, the facility stability is high, and later project running is safer and more reliable.

Description

technical field [0001] The invention relates to the technical field of construction of submarine intake / drainage tunnel facilities, in particular to an implementation scheme for vertical jacking of an underwater tunnel standpipe applicable in hard strata such as hard soil and rock. Background technique [0002] At present, most nuclear power plants at home and abroad need to introduce seawater into the condenser and discharge it to the nuclear power plant to "cool down". Construct a siphon well that connects the deep sea with the land. Considering the risks of underwater tunnel construction and to reduce the impact on the marine environment, the intake / drainage tunnels are mostly constructed using shield construction. Connect with the deep sea. At present, the mainstream implementation plan for connecting the riser in China is to push the riser out of the seabed section by section in the main tunnel through a closed roof with a cover after the construction of the main tunn...

AI Technical Summary

Problems solved by technology

In order to provide a stable foundation for the bulky head structure, it is necessary to use water dredgers to clean up the silt, throw gravel, etc., which not only requires a lot of engineering investment, but also increases the construction period.

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