Turbine rotor

An assembling method of a turbine rotor comprising the steps of:

• forming a coolant flow path through a plurality of disc shaped members respectively stacked across stacking planes in axial direction;
• inserting a heat resisting pipe in said coolant flow path;
• providing a ring shaped projecting portion on said heat resisting pipe;
• providing a spot facing recess portion in said coolant flow path at a stacking plane of said disc shaped members;
• and
• inserting said heat resisting pipe into said coolant flow path and contacting said ring shaped projecting portion of said heat resisting pipe with said spot facing recess portion.

A cooling method for cooling a high temperature portion of a gas turbine comprising the steps of:

• forming a coolant flow path through a plurality of disc shaped members respectively stacked across stacking planes in axial direction;
• inserting a heat resisting pipe in said coolant flow path for flowing a coolant through said coolant flow path;
• providing a ring shaped projecting portion on said heat resisting pipe;
• providing a spot facing recess portion in said coolant flow path at a stacking plane of said disc shaped members;
• and
• inserting said heat resisting pipe into said coolant flow path and contacting said ring shaped projecting portion of said heat resisting pipe with said spot facing recess portion and flowing coolant through said coolant flow path.