Ultra-large deepwater step type open caisson and soil taking strategy and construction method thereof

Abstract

The invention discloses an ultra-large deepwater step open caisson. The ultra-large deepwater step open caisson comprises a lower-layer open caisson and an upper-layer open caisson, the lower-layer open caisson and the upper-layer open caisson form a big-end-down step structure with the central axes coincident, the height of the lower-layer open caisson is 1.8-2.2 times that of the upper-layer open caisson, the two ends of the ultra-large deepwater step open caisson are each of an arc-shaped structure, after the ultra-large deepwater step open caisson finally sinks in place, the top surface of the lower-layer open caisson is located below the mud surface, and the top surface of the upper-layer open is located on the water surface. The invention further discloses a soil taking strategy and a construction method of the ultra-large deepwater step open caisson. The sinking mode that concrete is poured in the wall of the open caisson while soil is taken is adopted for sinking of the open caisson. According to the ultra-large deepwater step open caisson, the soil taking strategy and the construction method of the ultra-large deepwater step open caisson, on the premise that implementation of operation is guaranteed, conversion of all procedures in the implementation process is relatively easy and convenient to operate, the construction period on a key line in the bridge building process is shortened, and the working efficiency of open caisson sinking construction is improved.

Description

technical field [0001] The invention relates to the technical field of caisson foundation construction. More specifically, the present invention relates to a super-large deep-water stepped caisson and its earth-taking strategy and construction method. Background technique [0002] In the field of bridge construction, there are more and more applications of using caissons as bridge foundations, especially in the construction of super-long-span bridges across rivers or seas. Due to their structural stability, excellent bearing capacity and Strong adaptability to complex geological conditions has become the first choice for main piers or anchorage foundations. [0003] The planar structure of caisson foundations in water is mostly rectangular or round-end rectangular, and the vertical direction is generally the same up and down. As the load-bearing capacity of the bridge foundation is required to be higher and higher, the size of the caisson foundation is also getting larger....

AI Technical Summary

Problems solved by technology

The upper and lower sections of the traditional caisson foundation are the same, increasing the size of the caisson will inevitably reduce the cross-section of the water area, thereby increasing the scouring effect of the water flow on the pier foundation; in addition, increasing the size of the caisson structure will inevitably increase the weight of the caisson , on the one hand, it increases the cost of materials for building bridges, and on the other hand, it also increases the difficulty of construction

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