Method of correcting bend of joint type-turbine rotor

A method of correcting a bend of a joint type turbine rotor, comprising:

• step (a) of setting a displacement measuring instrument for measuring displacement and determining a bend amount of a convex portion of the bend at a joined portion of the joint type turbine rotor or displacement of a surface opposite to the convex portion in a circumferential direction of the joint type turbine rotor;
• step (b) of first determining an initial bend amount from measured displacement by the displacement measuring instrument after step (a);
• step (c) of heating the convex portion;
• step (d) of secondly determining the bend amount from measured displacement by the displacement measuring instrument after step (c);
• step (e) of cooling the joined portion after step (c);
• step (f) of thirdly determining the bend amount from measured displacement by the displacement measuring instrument after step (e);
• and
• step (g) of determining whether a bend amount of the joint type turbine rotor is within a predetermined range after step (f), wherein
• upon determining that the bend amount of the joint type turbine rotor is out of the predetermined range, step (c) to step (g) are performed again.