Protective structure of bridge pier, protective bridge and mounting method

In order to improve the safety of a bridge pier under the impact of rockfall or vehicles, the embodiment of the invention provides a bridge pier protection structure, a protection bridge and an installation method, and the bridge pier protection structure comprises a cushion layer buffer sleeve which is used for sleeving the outer side surface of the bridge pier and making contact with the outer side surface of the bridge pier; the core metal cylinder is concentrically arranged on the outer side of the cushion layer buffering sleeve in a sleeving mode, and a gap is formed between the core metal cylinder and the outer side of the cushion layer buffering sleeve; the rotary buffer sleeve concentrically sleeves the outer side of the core metal cylinder and is used for rotating around the outer side of the core metal cylinder by taking the center line of the core metal cylinder as a rotating shaft; and the cover plate is arranged at one ends of the cushion layer buffer sleeve, the core metal cylinder and the rotar