The invention provides a steel
sheet pile cofferdam structure, which belongs to the field of
cofferdam buildings, and comprises a plurality of steel
sheet pile bodies which can be spliced with one another; the multiple steel
sheet pile bodies are driven into the deep bottom of a river channel through a
pile driver, and every two adjacent steel sheet
pile bodies are connected in an inserted mode. The multiple steel sheet
pile bodies are matched with the corner pieces to jointly define a rectangular
cofferdam. The corner pieces are located at the four corners of the rectangular cofferdam. A plurality of rectangular enclosing
purlin assemblies which are arranged from top to bottom are arranged on the inner wall of the rectangular cofferdam, a plurality of supporting assemblies are evenly arranged in the enclosing
purlin assemblies, and the supporting assemblies abut against and are matched with the inner wall of the rectangular cofferdam; the supporting assemblies in one-to-one correspondence in the enclosing
purlin assemblies from top to bottom are jointly and fixedly connected through cooperation of bolt rods and nuts. By means of the three-point supporting design, the adjustable
assembly and the modular linkage structure, the problems of insufficient supporting strength, poor deformation adaptability and overall stability of the
deep excavation cofferdam are solved in a targeted mode, and the construction safety and the
structural reliability are remarkably improved.