Large deepwater foundation single-wall steel cover box cofferdam construction method

Abstract

The invention discloses a large deepwater foundation single-wall steel cover box cofferdam construction method. A single-wall structure is selected in a selected main pier steel cover box cofferdam, amain pier bearing platform is arranged to be constructed in the Xinjiang river dry season, analysis is made in combination with hydrologic data, the water level of the Yellow Sea elevation in the dryseason is positive 24.0 m, the protection water level of the cofferdam is positive 24.20 m, 0.30 m is considered to serve as the wave resistance height, in other words, the cofferdam top elevation ispositive 24.50 m, the bearing platform bottom face elevation is positive 13.0 m, the bottom sealing concrete thickness is 3.0 m, the cofferdam bottom elevation is positive 10.0 m, and the total height of a steel cover box is designed as 14.50 m. A closed structure is formed by a side plate and bottom sealing concrete for temporary water isolation, water in the cofferdam is pumped thoroughly, a cover box side plate is utilized as a bearing plate construction template, bearing platform and pier body construction in the cover box cofferdam is achieved, and manpower and material resource waste isreduced; and the operation difficulty is lowered, the mechanical degree is high, time consumed for construction is short, and the large deepwater foundation single-wall steel cover box cofferdam construction method can be used for large deepwater foundation equipment construction.

Description

technical field [0001] The invention relates to the technical field of cofferdam construction, in particular to a construction method for a large-scale deep-water foundation single-wall steel casing cofferdam. Background technique [0002] Cofferdam refers to the temporary enclosure structure built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. , to build buildings, generally mainly used in hydraulic construction, except as a part of the formal building, the cofferdam is generally removed after use, and the height of the cofferdam is higher than the highest water level that may occur during the construction period; the existing large The implementation of deep-water foundation cofferdam equipment requires a lot of manpower and material resources, the operation is difficult, the degree of mechanization is low, and the construction takes a long time. According to the invention, the single-wall bottomless steel ...

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Problems solved by technology

[0002] Cofferdam refers to the temporary enclosure structure built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. , to build buildings, generally mainly used in hydraulic construction, except as a part of the formal building, the cofferdam is generally removed after use, and the height of the cofferdam is higher than the highest water level that may occur during the construction period; the existing large The implementation of deep-water foundation cofferdam equipment requires a lot of manpower and material resources, the operation is difficult, the degree of mechanization is low, and the construction takes a long time. According to the invention, the single-wall bottomless steel casing is generally used for the construction of low pile caps. It is mainly composed of side plates and The box-shaped structure composed of internal supports, together with the bottom-sealing concrete, forms a temporary water-blocking structure for construction

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