Novel sheath, novel sheath mounting method and bridge cable

The invention relates to the field of bridge engineering protection, in particular to a novel sheath which comprises a strip-shaped body provided with a first end and a second end. The body comprises a metal layer and a fireproof thermal insulation layer which are arranged in sequence; one side surface of the fireproof heat-insulating layer is fixedly connected with the side surface of the metal layer, and the side surface, deviating from the metal layer, of the fireproof heat-insulating layer is fixedly connected with the peripheral surface of a bridge cable; the body can cover the peripheral face of the bridge cable and enable the first end and the second end to be connected to form a ring, at the moment, the two end faces of the fireproof thermal insulation layers located at the first end and the second end abut against each other, and the two ends of the metal layers located at the first end and the second end are fixedly connected. According to the novel sheath provided by the invention, the fireproof an