Method for disassembling/assembling gas turbine, seal plate assembly, and gas turbine rotor

A method for disassembling/assembling a gas turbine,

• the gas turbine including a seal plate disposed on a first side of a rotor disc in an axial direction of the rotor disc, and a seal plate restraint part for restricting movement of the seal plate relative to the rotor disc in a radial direction of the rotor disc,
• the method comprising a seal-plate-restraint-state switching step of moving the seal plate restraint part along the axial direction to switch between a seal plate non-restraint state where the seal plate restraint part does not restrict movement of the seal plate in the radial direction and a seal plate restraint state where at least a part of the seal plate restraint part protrudes in the axial direction from the seal plate and thereby restricts movement of the seal plate in the radial direction.

A seal plate assembly for a blade of a gas turbine, comprising:

• a seal plate having a first surface and a second surface which face in opposite directions;
• and
• a movable part capable of protruding from the first surface at a variable protrusion amount.

A method for producing a gas turbine,

• the gas turbine including a seal plate disposed on a first side of a rotor disc in an axial direction of the rotor disc, and a seal plate restraint part for restricting movement of the seal plate relative to the rotor disc in a radial direction of the rotor disc,
• the method comprising a seal-plate-restraint-state switching step of moving the seal plate restraint part along the axial direction to switch from a seal plate non-restraint state where the seal plate restraint part does not restrict movement of the seal plate in the radial direction to a seal plate restraint state where at least a part of the seal plate restraint part protrudes in the axial direction from the seal plate and thereby restricts movement of the seal plate in the radial direction.