Construction method for steel sheet pile cofferdam on underwater exposed bedrock

Abstract

The invention discloses a construction method for steel sheet pile cofferdam on an underwater exposed bedrock. According to the method, steel sheet pile cofferdam can be constructed without grooving the exposed bedrock on an underwater plane. A covering layer is formed through sand filling, a construction environment that the covering layer is formed underwater is built, then a conventional steel sheet pile cofferdam construction technique is adopted directly, and steel sheet pile cofferdam construction is finished. The work of formation of a mounting groove through drilling on the water surface is omitted, the construction cost is effectively reduced, the construction cycle of a project is shortened, and the work efficiency is improved; a basic covering layer for steel sheet pile positioning is formed through sand throwing and filling, the construction environment that a covering layer is formed on the exposed bedrock underwater is built, steel sheet piles are subjected to insertion and closure construction, and then steel sheet pile cofferdam construction is completed. The method does not require underwater construction of mounting grooves, the steel sheet piles are accurately positioned, the difficulty of the construction technique is small, requirements for equipment are reduced, and high-efficiency and high-quality cofferdam construction is realized.

Description

technical field [0001] The invention relates to the technical field of water conservancy projects, in particular to the construction technology of steel sheet pile cofferdams in water conservancy projects such as river courses, and specifically relates to a construction method for steel sheet pile cofferdams on large and flat exposed rock foundations under water. 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] Sheet pile cofferdam is the most commonly used ...

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

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