The present invention relates to a construction method for a circumscribed regular polygon deep foundation and a temporary retaining wall structure for the same. A deep foundation is constructed as the temporary retaining wall structure of a regular polygon shape in contact with a circular underground surface to be excavated is installed. So, resistance on drawing is remarkably improved in comparison with a cylindrical deep foundation using an existing liner plate, and over-cutting and crack are suppressed when the ground is excavated. Therefore, the construction method can reduce costs and construction periods and can obtain work stability. According to the present invention, a bent H-pile (1) having a bent shape is vertically fixed from a regular polygon apex position to a predetermined depth. A ground excavation hole (200) is formed, and an extension support rod (2) is located at a gap between the bent H-piles (1). The extension support rod (2) is extended so that both sides of the extension support rod (2) are pressed and attached to a side of a web (13) of the bent H-pile (1). An earth retaining wall (3) is installed on the rear of the extension support rod (2) in the gap between the bent H-piles (1), and, therefore, the temporary retaining wall structure (100) is constructed. Concrete is placed into the ground excavation hole(200) in which a ground excavation surface is supported by the temporary retaining wall structure (100), so the deep foundation (300) is formed.;COPYRIGHT KIPO 2016
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