Patent ID: 8721270

Claim:
A passage wall section for an annular flow passage of an axial turbomachine, comprising: an encompassing circumferential groove in an inwardly pointing surface of the flow passage, and a guide ring which is arranged in the circumferential groove, wherein the guide ring delimits the flow passage, wherein the guide ring is displaceable at least in an axial direction in order to adjust radial gaps which exist between a wall surface of the guide ring and rotor blade airfoil tips opposite the wall surface, wherein the guide ring comprises a first toothing arrangement which is in contact with a second toothing arrangement which is arranged on a sidewall of the circumferential groove, wherein for axial displacement of the displaceable guide ring, the guide ring is rotated in a circumferential direction, and wherein the guide ring is in pretensioned contact with the second toothing arrangement via a spring element or a plurality of spring elements.