Exactly located novel immersed pipe for foundation construction equipment

The utility model discloses a building construction device, in particular to a pile-forming sinking pipe of basic construction device. The sinking pipe is formed by a hollow tubular pipe body (1) and a bottom, wherein, the inside of the bottom is provided with a positioning groove (9) matched with the positioning steel feet of a excavation device. Compared with the prior art, the sinking pipe reduces manufacturing cost and simplifies manufacturing art, and the proportion between the tubular pipe body and the inner diameter of the bottom can be ensured. The positioning groove has enough depth, and the positioning steel feet on the excavation expanded bore device insert into the groove easily with exact positioning, stability and reliability; thus, the concentricity of the pile body and the seat can be enhanced, and the bearing force of the single pile can reach design the standard. The immersed tube can be used not only in hinterland but also in littoral.