Dry-dock-free underwater shallow-buried open-cut large channel basic structure unit and construction method

Abstract

The invention relates to a dry-dock-free underwater shallow-buried open-cut large channel basic structure unit and a construction method. The basic structure unit used in the method has the following characteristics that the length of each basic structure unit is 20-25m, a sealing door is arranged at one end of each basic structure unit, the other end of each basic structure unit is of an open structure, and a drainage pressure relief valve is arranged at the lower end of each sealing door; a rubber water stop belt is arranged at the end of each basic structure unit in a surrounding mode, and a floating and ballasting cabin capable of adjusting the water inlet and drainage capacity is fixed in each basic structure unit; and at least four axis positioning foot stands are arranged at the bottom of each basic structure unit. The channel basic structure unit can be directly prefabricated on the flat ground, a large temporary dry dock does not need to be built, the temporary engineering investment is reduced, the manufacturing cost of an underwater channel is reduced, and the construction period of the underwater channel is shortened; and the basic structure unit can slide into a water area from a land area through a slideway, the basic structure unit is kept in a suspended state in water by adjusting the air volume in the floating and ballasting cabin, the basic structure unit is pulled and sunk by a floating crane ship, the construction efficiency is improved, and the water construction difficulty is reduced.

Description

technical field [0001] The invention relates to the field of underwater engineering, in particular to a basic structural unit of a large channel of shallow buried open-cut underwater without dry dock and a rapid construction method thereof. Background technique [0002] Most of the cities in my country with a population of over one million are built on rivers, lakes and seas. Rivers, lakes and seas bring development to the city, but also divide the two sides of the city, which to a certain extent hinders the formation of the overall traffic network of the two sides of the city. Tunnels have outstanding advantages such as all-weather and no impact on shipping. The construction of underwater tunnels is an important means to break through the barriers of rivers, lakes and seas on both sides of the city, connect the urban road network, and develop the regional economy. [0003] Conventional underwater channel construction methods include mining method, shield method and immersed...

AI Technical Summary

Problems solved by technology

However, under normal circumstances, due to the dense buildings on both sides of the city and the precious land resources, it is difficult to find a large area of ​​​​temporary sites as dry docks near the sinking waters, and the temporary dry docks need to be backfilled after the completion of the immersed tube tunnel, resulting in the overall project The quantity is large, the construction period is long, and the cost of temporary works is high;

[0006] (2) The length of the basic structural unit is generally 100m-120m, and the weight is 40,000-50,000 tons, which makes it difficult to transfer the pipe section from the dry dock to the water area. Only when consigned by a tugboat can the transfer of the pipe joint before sinking be completed;

[0007] (3) The pipe joint is a sealed cavity, which floats by its own buoyancy. During the floating process of the pipe joint, the top plate is always about 10cm above the water surface. Under the action, sway and surge are prone to occur, which will cause the pipe joint to capsize and cause accidents; in addition, when the pipe joint is sunk, it must be equipped with a special sinking ship for sinking, resulting in difficult construction, long period and high cost;

[0008] (4) When the pipe joint is crimped underwater, the elevation is controlled by one fulcrum at the joint and two fulcrums at the tail. There are few fulcrums, and the long pipe joint is prone to torsion under the action of water flow, resulting in axis deviation and vertical elevation Difficult to control precisely

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