Construction structure and method of steel sheet pile cofferdam with support in deep water

Abstract

The invention relates to a construction structure and method of a steel sheet pile cofferdam with support in deep water and belongs to the technical field of construction of deep underwater cofferdams. The construction structure comprises the composite reinforced steel pile cofferdam, a support in-situ assembly platform and a cofferdam support placement fixing system. Compared with the prior art,the construction structure and method has the advantages that the support structure of the underwater part is assembled firstly before dewatering, and better safety is achieved; a floating platform isarranged to serve as the support in-situ assembly platform assorted with a platform hanger, the support structure of the cofferdam can be assembled in situ, and construction efficiency is greatly improved; cofferdam support placement grooves are assembled on part of pipe piles in advance, and convenience for subsequent lowering and assembling of the cofferdam is achieved; stress sensors and control systems are arranged on cofferdam walings and diagonal bracings, jacking force can be controlled immediately according to stress of the cofferdam structure during dewatering, and safety of the structure is guaranteed.

Description

technical field [0001] The invention relates to the technical field of cofferdam construction, in particular to a construction structure and a construction method of a cofferdam with braced steel sheet piles under water in deep water. Background technique [0002] With the development of economy and society, more and more large bridges spanning large rivers and even crossing seas appear in bridge projects in our country. The above-mentioned construction inevitably requires deep-water foundation construction, that is, to use the cofferdam structure to provide construction personnel with a safe and convenient construction environment, which poses a difficult problem for engineers, especially the construction of deep-water cofferdams. [0003] As a kind of waterproof performance, the steel sheet pile is easy to construct, and can be recycled and reused, so it can be used for cofferdam construction. However, there are relatively few projects that apply steel sheet piles to coff...

AI Technical Summary

Problems solved by technology

However, there are relatively few projects applying steel sheet piles to cofferdam construction at present. Through analysis, it is found that there are specific problems as follows: At present, the country has not issued relevant regulations on the construction of steel sheet piles; the production process of steel sheet piles is relatively complicated, and the initial investment cost is huge. ; It is very difficult to apply steel sheet piles to cofferdam construction, especially in deep water projects

The construction of deep-water cofferdams must first solve the problem of on-site assembly of support structures. If the transportation plan is made on the shore, the entire construction progress will be greatly slowed down. In fact, it is the installation of the cofferdam structure support. There are many difficulties in the installation of deep-water underwater supports. Many factors, such as water pressure and undercurrent at the bottom of the deep water, will have a greater impact on the installation accuracy.

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