Combined nut

The utility model relates to a combined nut which comprises an upper protective shell, a lower protective shell is hinged to the front face of the upper protective shell through a hinge frame, a mounting mechanism is arranged on the right side of the outer side wall of the upper protective shell, and a first combined nut body and a second combined nut body are arranged below the inner side wall of the upper protective shell. A splicing mechanism is arranged on the left side face of the first combined nut body. According to the combined type nut, the splicing structure is arranged in the combined type nut, mutual splicing between the first combined type nut body and the second combined type nut body can be achieved through mutual matching of all structures in the splicing structure, and workers can conveniently mount and dismount the combined type nut; and if the nut is damaged or corroded, the nut does not need to be taken down in a violent disassembly mode, and after the combined nut is taken down, the threa