Device for controlling thickness of steel bar protective layer of bridge pier column and construction method of device

The invention provides a device for controlling the thickness of a steel bar protective layer of a bridge pier column and a construction method of the device, and relates to the technical field of bridge construction.The device comprises a pier column body, an adjusting frame arranged outside the pier column body in a sleeving mode and a plurality of supporting rods arranged below the adjusting frame; a plurality of inner formworks close to the pier column body are arranged on the adjusting frame, a plurality of outer formworks away from the pier column body are arranged on the adjusting frame in a sliding mode, the inner formworks and the outer formworks are arranged in the circumferential direction of the pier column body, a steel bar protection layer is formed between the inner formworks and the outer formworks, and an adjusting assembly for adjusting all the outer formworks to slide synchronously is arranged on the adjusting frame; the method comprises the steps of cleaning a construction range, installin