Crushing device, breaking method and application of pile head of cast-in-place bored pile

The invention discloses a crushing device, a breaking method and an application of a pile head of a cast-in-place bored pile. The crushing device of the pile head of the cast-in-place bored pile comprises the crushing device, wherein the crushing device is used for separating pile head concrete from pile body concrete through horizontal expansion force; the crushing device comprises a horizontal crushing assembly and a communicating pipe, wherein the horizontal crushing assembly is arranged at the joint position of the pile head concrete and the pile body concrete, and the horizontal crushingassembly is used for generating the horizontal expansion force to force the pile head concrete to be separated from the pile body concrete; and the communicating pipe extends out of the pile head concrete and is in communication with the inner cavity of the horizontal crushing assembly, and is used for injecting a crushing agent into the inner cavity of the horizontal crushing assembly. Accordingto the crushing device of