Construction method for double-wall steel suspension cofferdam of main bridge bearing platform of super-large bridge

Abstract

The invention provides a construction method for a double-wall steel suspension cofferdam of a main bridge bearing platform of a super-large bridge. The construction method comprises the following steps that S1, steel casings are built on a river bed, and the cofferdam is assembled on the portions, above the surface of water, of the steel casings; S2, the cofferdam is laid down, and internal supports are installed in the cofferdam; S3, top-sealing concrete is poured in the cofferdam, and accumulated water in the cofferdam is drained; S4, the portions from pier bodies to the lower side of the middle internal support are built, and connecting supports are arranged between the pier bodies and the inner wall of the cofferdam and between the pier bodies; S5, the portions from the pier bodies tothe top internal support are built, and connecting supports are arranged between the pier bodies and the inner wall of the cofferdam and between the pier bodies; S6, the pier bodies are built to be above the surface of water, building of the pier bodies is completed, and building of a large bridge main pier foundation is completed. Embedded parts are arranged on the pier bodies, supporting piecesare arranged between the pier bodies and the cofferdam and between the pier bodies, the supporting pieces are connected with the embedded parts, the support of the interior of the cofferdam is enhanced, and the structural strength of the cofferdam is ensured.

Description

technical field [0001] The invention belongs to the technical field of cofferdam construction for a cap of a main bridge, and in particular relates to a construction method for a cofferdam of a double-walled steel suspension box for a cap of a super-large bridge. Background technique [0002] With the rapid growth of my country's economy, the country's infrastructure continues to increase. In order to improve the convenience of transportation, it is often necessary to build a bridge with a large span on a large river, and the bridge cap is the key to the bridge. The cofferdam is a water surrounding structure independent of the bridge cap and the pier body. A safety barrier for foundation construction. The riverbed of the river is often not smooth, and the situation of the riverbed is complicated. In some rivers, the riverbed has large undulations and deep water depth, which increases the difficulty of cofferdam construction. In the case of large undulations of the riverbed,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for the double-walled steel suspension box cofferdam of the main bridge cap of a super-large bridge, so as to at least solve the problems that the current cofferdam assembly and welding quality is difficult to guarantee, the cofferdam is lowered, and the underwater bottom sealing is difficult.

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