Steel sheet pile cofferdam structure and construction method

The invention discloses a steel sheet pile cofferdam structure and a construction method, the steel sheet pile cofferdam structure comprises cofferdam plates, the two sides of each cofferdam plate are provided with a first connector and a second connector respectively, the first connectors and the second connectors are each of an arc-shaped structure, and when every two adjacent cofferdam plates are combined, the first connectors and the second connectors are combined to form an oval structure; the inner shell is inserted into the first connector and the second connector which are combined to lock the oval structure, a connecting rod assembly is arranged in the inner shell, and the connecting rod mechanism comprises a vertical rod and a connecting rod which slide in the axial diameter direction. According to the steel sheet pile cofferdam structure and the construction method, the first connectors and the second connectors at the connecting positions of the cofferdam plates are fixed through the inner shell a