Prefabricated concrete pile foundation mechanical combined type connecting device

The utility model relates to a mechanical combined connecting device for a prefabricated concrete pile foundation, which is divided into four parts, namely a prefabricated pile section (1), a pile end part connecting piece (2), a high-strength bolt (3) and a reserved bolt hole (4), and is characterized in that the prefabricated pile foundation overcomes the disturbance of the traditional cast-in-situ bored pile foundation to the environment and the stratum; the prefabricated pile segments (1) and the pile end connecting pieces (2) are prefabricated in a standardized mode in a factory and fixed together, the pile end connecting pieces (2) can be nested in appearance, the connecting positions are tightly attached, the shape and size of the connecting positions of the pile foundation are not changed, and therefore the prefabricated pile segments (1) and the pile end connecting pieces (2) can be fixed together. Threads are arranged on the side wall of the high-strength bolt (3) and the side wall of the reserved b