Immersed tube segment batch prefabricating method capable of reducing scale of dry dock

Abstract

The invention relates to an immersed tube segment batch prefabricating method capable of reducing the scale of a dry dock. The method comprises the following steps that (1) in a small temporary dry dock, part of components of an immersed tube segment are prefabricated for the first time, the components comprising a bottom plate, part of a sidewall, a middle partition wall and sealing doors at two ends, an open type tube segment similar to a ship is formed, the dead weight of the tube segment is reduced as much as possible, and the draft depth of the tube segment is reduced as much as possible; (2) the tube segment is towed to the position near a tunnel site; (3) a prefabricated site without silt accumulation is selected in water and leveled, a plurality of uninflated air bags are immersed in the site and anchored to the river bottom, and the air bags are inflated; (4) the tube segment is slowly located on the inflated air bag structure; and (5) the rest part of the side wall and top plate reinforced concrete part of the tube segment are poured and constructed for the second time, and overall prefabrication of the immersed tube segment is completed. According to the immersed tube segment batch prefabricating method, the work amount is small, the influence on the environment is small, and the site area of the temporary dry dock, the foundation pit depth and the tube segment hauling difficulty can be effectively reduced.

Description

technical field [0001] The invention relates to the field of immersed tube tunnels, in particular to a batch prefabrication method for immersed tube joints which can reduce the area occupied by dry docks and the depth of foundation pits of dry docks. Background technique [0002] Immersed tube tunnel is an underwater tunnel built by immersed tube sections through prefabrication in dry dock, hauling, sinking and docking, foundation treatment, backfilling and covering. The tunnel is shallow in depth, short in length, and flexible in connection with roads on both sides of the water area. After successful construction, it can greatly save land resources in the central urban area. It is one of the main methods for urban construction of underwater tunnels. [0003] At present, there are mainly two methods for the prefabrication of pipe sections of immersed tunnels: one is integral prefabrication of reinforced concrete pipe sections, and the other is floating prefabrication of stee...

AI Technical Summary

Problems solved by technology

[0007] (3) Pipe joints are integrally prefabricated, the haulage channel is required to be deep, and the cost of temporary dredging of the channel is high, which has a great impact on the environment;

[0008] (4) Integral prefabrication of pipe joints, heavy weight, long pipe joint distance, tens of thousands of tons of components, similar to an aircraft carrier, high risk of hauling

[0010] (1) Steel shell pipe joints are mostly circular sections, and the utilization rate of the section is not high; (2) The welding requirements of steel shells are high, the process is complicated, the amount of steel is large, the requirements for underwater corrosion are high, and the cost is high; (3) Steel shells Most of the shell and tube joints are equipped with inner and outer steel plates and a hollow structure in the middle. If only a single-layer steel shell structure is used, the concrete construction requirements are high, and the concrete compactness and watertightness requirements are difficult to meet, and the structural risk is large; (4) steel shell The pipe joint has a high buoyancy center and is greatly affected by the impact of water flow. It is difficult to control the stability of the pipe joint during concrete pouring in the floating state, and the construction risk is high

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