Construction method of combination cofferdam of steel sheet piles and film bag sand

The invention provides a construction method of a combination cofferdam of steel sheet piles and film bag sand. The construction method of the combination cofferdam of the steel sheet piles and the film bag sand comprises the steps that surveying and setting out are carried out, an original riverbed is subjected to finishing, underwater riprapping is carried out on the outer river side, medium-coarse sand is subjected to hydraulic reclamation, the steel sheet piles are constructed, the film bag sand is used for pressing feet, split anchor rods are arranged and the cofferdam is subjected to finishing. Compared with an existing construction method of a cofferdam, the advantages of a steel sheet pile cofferdam and a film bag sand cofferdam are combined, the combination cofferdam of steel sheet piles and film bag sand and with double advantages is formed, and the combination cofferdam is firm and stable and has good safety performance; the medium-coarse sand is subjected to hydraulic reclamation, land constructio