Water-bottom mine shield tunnel combination butt joint structural form and construction method thereof

Abstract

The invention provides a water-bottom mine shield tunnel combination butt joint structural form and a construction method thereof and relates to the technical field of urban rail transit construction. A bench cut method is adopted for excavation from a mine tunneling method tunnel section, receiving section tunnel primary support construction is conducted, and a bottom sub wall is closed when excavation is conducted to a butt joint point; the stratum in front of a butt joint section is subjected to grouting reinforcement; then a receiving section is poured to close a box body lining, and the box body lining is filled with cement mortar; then a shield machine conducts constant-speed tunneling and enters the box body lining after directly breaking the bottom sub wall and the filled cement mortar; a cutterhead of the shield machine is arranged to be detachable, then a hoisting point is arranged on a shield machine outer shell, all components of the shield machine are detached and conveyed out from the position, on the rear side, of a shield machine tunnel, and the steel shell of the shield machine is left in a hole; and finally, a secondary lining is constructed in the tunnel for connecting all the sections. The water-bottom mine shield tunnel combination butt joint structural form and the construction method thereof are suitable for butt joint construction, adopting a mining method and a shield method, of the underwater and subsea tunnel and an underground structure, structural stability and construction safety are good, and the organizational form of the shield construction method is enriched.

Description

technical field [0001] The invention relates to the technical field of urban rail transit construction, in particular to a combination butt joint structure form of an underwater mine shield tunnel and a construction method thereof. Background technique [0002] With the acceleration of the urban construction process, more and more underground spaces that have little impact on ground traffic and the environment are favored. my country's urban subway construction is developing rapidly, and there are more and more plans for subway lines crossing the sea in coastal cities. At present, the construction of subsea tunnels in my country is still in its infancy, and the differences in strata and the complexity of the construction environment in each city are different, and the suitable construction methods and structural types of tunnels in the cross-sea section are also different. The construction methods suitable for underwater tunnel construction mainly include cofferdam open cut...

AI Technical Summary

Problems solved by technology

[0005] There are some deficiencies in the method of using the above-mentioned conventional shield tunneling to organize tunnel construction. First, the construction organization is not flexible, which limits the scope of use of the shield tunneling method.

When shield tunneling is connected with other construction methods, only open-cut shafts can be used for hoisting and dismantling of large shield tunneling machines, and for crossing waters, it can only be installed on shore land

Secondly, if the connection point between the shield tunneling method and the mining method is located in a water area, it is necessary to set up a shaft in the sea. To set up the shaft, you must first build a cofferdam and build an island, which will affect the passage of the waterway, and the investment cost and construction difficulty will increase significantly.

Thirdly, if the mining method is used to construct an enlarged receiving cavern on the seabed first, and the shield tunnel is pushed through the mining method section, the entire section of the mining method needs to be enlarged, and the investment will increase; at the same time, a large receiving cavern and Long-distance air-push shield construction has high risks

Finally, sea area tunnels are generally control node projects with high construction period requirements, and the single shield method is not flexible enough to organize. Once a problem occurs in the shield tunnel, there is no good solution, which will affect the progress of the entire project.

[0006] From the above analysis, it can be seen that the shield tunneling method and the mining method are generally used to construct underwater tunnels, and the connection position is set in the land area through the shaft method, which has the obvious disadvantages of inflexible construction organization and low efficiency.

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