A composite cofferdam structure and its construction method

Abstract

The invention discloses a combined cofferdam structure and a building construction method thereof. The combined cofferdam structure is composed of earth rock cofferdams in shallow water areas on the two sides of a riverway and a steel plate pile cofferdam in a deep water area in the center of the riverway. The steel plate pile cofferdam is located between the earth rock cofferdams on the two sides, and composed of a plurality of sets of main cofferdam grids and auxiliary cofferdam grids filled with gravel in a spaced and continuous mode. A foundation covering layer which is formed by manually throwing and filling the gravel and used for locating a steel plate pile is arranged on a riverbed at the bottom of the steel plate pile cofferdam. The construction method comprises the steps that the locating foundation covering layer is formed by throwing and filling the gravel, the steel plate pile is inserted and driven, the cofferdams are closed, the cofferdam grids are filled with the gravel in a throwing mode, and consolidation grouting or high-pressure whirl-spray grouting seepage-proofing construction is carried out. The steel plate pile is embedded in the combination portions of the earth rock cofferdams and the steel pipe pile cofferdam to be fixedly connected with the structure, the two structural bodies are fused well, and the overall cofferdam structure is more stable. The locating foundation covering layer is formed, mounting groove underwater construction is not needed in the method, and efficient and high-quality cofferdam construction is achieved.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to cofferdam construction technology in water conservancy projects such as river courses, and specifically relates to an underwater combined cofferdam structure and a construction method thereof. 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. Its function is to prevent water and soil from entering the construction position of the underwater structure, so as to facilitate the construction of dry tanks in the cofferdam. Generally, cofferdams are mainly used in hydraulic constructions. Except for a few cofferdams as part of formal underwater structures, most cofferdams need to be dismantled after use. [0003] At present, in the water conservancy industry, the cofferdam design form is generally a single form, ...

AI Technical Summary

Problems solved by technology

Although its construction technology can meet the requirement that the bottom of the steel sheet pile will not be displaced due to the influence of the lower water flow, the drilling method to form the installation groove has a long construction period and high cost, and the formation of the installation groove by underwater drilling requires high precision of the drilling position and is difficult to control Big

[0005] Combination of cofferdams composed of different structures and materials, the structural layout and material application of the combination has not yet been further studied

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