Construction method of steel-shell diaphragm composite cofferdam for shallow overburden and deep hard bedrock

Abstract

This application discloses a construction method for a steel-shell diaphragm wall combined cofferdam for deep, hard bedrock with shallow overburden, relating to the field of bridge cofferdam construction. The method includes the following steps: S1, driving steel casings into the main pier to construct the main pier pile foundation; S2, installing internal supports on the main pier steel casings and using these supports as guides to lower a guide steel shell below the riverbed line; S3, constructing the diaphragm wall in sections within the guide steel shell to complete the entire cofferdam construction. This application solves the problem of poor waterproofing and soil-retaining effect caused by steel sheet pile deformation, improves the waterproofing and soil-retaining effect of the cofferdam, effectively reduces construction difficulty, reduces the amount of steel sheets used, and effectively controls construction costs.

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