Long pile casing sinking operation obstacle removing hammer and using method thereof

The invention belongs to the field of construction of building engineering pile foundations, and particularly relates to a long pile casing sinking operation obstacle removing hammer and a using method thereof. The obstacle removing hammer comprises a hammer body, a hammer cap arranged above the hammer body and a hammer bottom arranged below the hammer body, wherein hammer tooth assemblies are uniformly and annularly arranged in the circumferential direction of the hammer bottom, and a connecting ring is arranged on the hammer cap. When the long pile casing sinking operation encounters an obstacle and the long pile casing cannot continue to sink, after rock and soil above the obstacle in the long pile casing are taken out by a grab bucket, the long pile casing is lifted upwards, then a steel wire rope of a hoisting machine is connected with the connecting ring of the obstacle removing hammer, the obstacle removing hammer is placed in the long pile casing, the obstacle removing hammer quickly impacts the obsta