Pipe piles by steel tube, tongue-and-groove tongue-and-groove mortise and tenon pin, tube diameter on the left side wall of the vertical tongue-and-groove connection slot, tongue-and-groove slot cross section for the open side of the square shape, in strengthening ribs on the side of the tongue-and-groove slot, steel pipe diameter on the right side of the wall and the partial radius position of the vertical connection have tongue-and-groove pin, tongue-and-groove pin groove profile for i-section. This article is about the use of pipe piles.