Rapid Construction Method of Underwater Shallow Buried Open Cut Large Channel without Dry Dock

Abstract

The present invention relates to a rapid construction method of large-scale shallow buried open excavation without dry dock. The basic structural unit used in the method has the following characteristics: the length of each basic structural unit is 20-25m, one end is provided with a closed door, and the other end is an open structure , the lower end of the sealed door is provided with a drainage pressure relief valve; the end of the basic structural unit is surrounded by a rubber waterstop, and a floating and ballast cabin with adjustable inlet and drainage capacity is fixed inside; at least four chambers are installed at the bottom of the basic structural unit. Axis positioning feet. The basic structural unit of the channel described in the present invention can be prefabricated directly on the flat ground without the need to build a large temporary dry dock, which reduces the investment in temporary projects and saves the cost and construction period of the underwater channel; Entering the water area, by adjusting the air volume in the floating and ballasting cabin, it will remain suspended in the water, and will be pulled and sunk by the floating crane, which improves the construction efficiency and reduces the difficulty of water construction.

Description

technical field [0001] The invention relates to the field of underwater engineering, in particular to a basic structural unit of a shallow buried open-cut underwater large channel without a dry dock and a rapid construction method thereof. Background technique [0002] The vast majority of cities with a population of over one million in my country are built along rivers, lakes and seas. While bringing development to cities, rivers, lakes and seas also divide the two sides of the city, hindering the formation of the overall traffic network of cities on both sides to a certain extent. Tunnels have the outstanding advantages of being all-weather and not affecting 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 regional economy. [0003] Conventional underwater channel construction methods include mine method, shield method and imm...

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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