Pencil pile

The invention is suitable for the technical field of building construction, and provides a pencil stub which comprises a conical stub tip and a PHC pipe stub body, and the conical stub tip and the PHC pipe stub body are fixed through a connecting device; the connecting device comprises a fixing column coaxially and fixedly installed on the conical pile tip, a locking annular groove is formed in the outer wall of the fixing column, and an oval block is fixedly installed at the top end of the fixing column; the rotating screw rod is coaxially and rotatably mounted on the PHC pipe pile body, and an elliptical groove matched with the elliptical block is formed in the end part of the rotating screw rod; the rotating screw rod is sleeved with the rotating screw sleeve in a threaded connection mode. According to the pencil pile provided by the invention, through the arranged connecting device, after the conical pile tip and the PHC pipe pile body are fixedly connected, the stability of connection between the conical