Patent ID: 8794924

Claim:
A rotating body comprising: a rotor disk that has a moving blade fitting groove that is annularly provided along an outer circumference and a moving blade lead-in hole that is provided in the outer circumference and is in communication with the moving blade fitting groove; a plurality of moving blades that are consecutively provided in the outer circumference and that each have a blade root that is fitted in the moving blade fitting groove and a wing body that projects to the outer side of the rotor disk; two special moving blades that each have a blade root and a wing body, wherein a portion of each blade root of the special moving blades is fitted in the moving blade fitting groove and each wing body of the special moving blades projects to the outer side of the rotor disk, the special moving blades being mutually adjoining so as to block the moving blade lead-in hole; and a tensioning key that is inserted between the moving blades, wherein the tensioning key is provided with an insertion portion whose thickness dimension in the circumferential direction gradually increases from one end on the inner side in the radial direction toward the other end on the outer side in the radial direction, and guide grooves in which the tensioning key is fitted so as to be fixed are formed in side walls of the moving blade fitting groove, and wherein the guide grooves are formed such that a width of the guide grooves in the circumferential direction gradually increases from one end on the inner side in the radial direction toward the other end on the outer side in the radial direction.