Offshore inland river intersection area immersed tube tunnel construction technology

Abstract

The invention discloses an offshore inland river intersection area immersed tube tunnel construction technology. The offshore inland river intersection area immersed tube tunnel construction technology comprises the following steps that S1, water channel traffic reconciliation and immersed tube tunnel foundation trench excavation and desilting construction are carried out, the immersed tube tunnel foundation trench is excavated and constructed stage by stage, and smooth navigation of at least one side of a water channel is kept; S2, immersed tube joints are prefabricated in a river bank dry dock in batches; S3, floating transportation and sinking installation construction of immersed tube joints are carried out; and S4, immersed tunnel foundation trench backfilling construction is carried out. The problem of navigation coordination of all the river channels in the river intersection area is solved, foundation trench staged construction is carried out according to the floating transportation scheme and the water transportation condition, smooth navigation of at least one side channel is kept during foundation trench construction in each stage, so that the influence of construction on navigation of all the river channels in the river intersection area is effectively reduced, and the river channels can still be kept in a normal navigation state; and in addition, the pipe joints are prefabricated, subjected to floating transportation and sinking, and installed in batches, and the construction efficiency is effectively improved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction technique for an immersed tube tunnel in an offshore inland river confluence area. Background technique [0002] my country has a vast territory and numerous water systems, and many rivers intersect in many cities. With the development of economy and the rapid development of transportation technology, in order to overcome the barrier of water flow, many cross-river and sea-crossing projects were born. The smooth opening of the Hong Kong-Zhuhai-Macao Bridge has demonstrated the comprehensive strength of my country's transportation industry, and it has also made underwater tunnels a major trend in the development of cross-water transportation projects. [0003] At present, the relatively mature methods of underwater tunnel construction in China include mining method, shield method and immersed tube method. Compared with the other two construction methods, the imm...

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Problems solved by technology

[0004] At present, the cross-river immersed tube tunnels built in my country are mostly used in a single inland river, and the watershed is simple and stable. There are few studies on immersed tube construction in the complex scene of the inland river confluence area. The use of conventional immersed tunnel construction in the scene has a very large impact on the navigation of various rivers

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