Steel cofferdam caisson

Abstract

The invention discloses a steel cofferdam caisson. The steel cofferdam caisson comprises a caisson body and a steel cofferdam arranged at the top of the caisson body, wherein the steel cofferdam comprises a cofferdam wall; the cofferdam wall is arranged on the outer side of the caisson wall of the caisson body; the cofferdam wall and the caisson wall are connected in a sealed mode through fasteners; the cofferdam wall comprises a plurality of wall bodies which are sequentially connected to form a cuboid shape in a surrounding mode; and a reinforcing support is connected between every two adjacent wall bodies, and every two adjacent wall bodies are connected in a sealed mode through a sealing piece. The steel cofferdam caisson is stable and reliable in structure, high in water tightness, good in water insulation effect and capable of meeting the requirements that the whole steel cofferdam caisson is in a stable state under the extremely high water level condition, and the interior of abin is in a waterless state.

Description

technical field [0001] The invention relates to the technical field of water transport engineering construction, in particular to a steel cofferdam caisson. Background technique [0002] The existing large cap cofferdam construction technology mainly adopts the steel sheet pile cofferdam construction technology. The steel sheet pile cofferdam is located in soft ground such as sand layers, which can be quickly inserted and drilled, convenient for construction, and effectively plays the role of enclosure and waterproofing. After the subgrade treatment is completed, the operation is carried out in the traditional way, that is, caisson prefabrication-transportation and placement-caisson backfill-sealing cushion under water pouring-underwater steel formwork support-reinforcement cage prefabrication and placement-underwater pouring of caissons Cover concrete - mast piers for underwater construction. [0003] The difficulty of using this technology for construction mainly lies in ...

AI Technical Summary

Problems solved by technology

On the one hand, it is more difficult to control the construction quality of underwater concrete (sealing cushion, caisson cover, part of mast pier body) compared with dry work; Formwork construction is extremely difficult. Even if steel box cofferdams are used to solve the underwater assembly of formwork, divers are still required to carry out underwater manual work for the water-stopping measures and reinforcement construction, which poses a large number of safety hazards, and the construction platform The erection of the caisson has brought great constraints in terms of cost and construction period; at the same time, the positioning control and displacement observation during the caisson placement process must also be carried out underwater, and it is difficult to achieve accurate positioning of the caisson placement

Therefore, the disadvantages of the prior art are mainly the instability in safety, quality, and construction period brought about by a large number of underwater constructions and measurements.

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