DISC SHAFT CENTER ADJUSTING MECHANISM IN GAS TURBINE

A disc shaft center adjusting mechanism in a gas turbine comprises the following: exhaust gas diffusers (13) provided between a bearing case (11) and an interior wall (10) connected to the downstream side of a turbine; a plurality of struts (14) provided in the circumferential direction with gaps therebetween; and strut covers (15) for connecting the outer diffuser (13a) and the inner diffuser (13b) of the exhaust gas diffusers so as to cover the struts. The interior wall has a plurality of air introduction holes (17) for communicating with the interior and exterior of the wall, and is provided with sensors (25) for detecting parameters associated with the thermal expansion of the struts, and flow volume adjustment parts (20) for adjusting, on the basis of detection values detected by the sensors, the flow volume of air flowing through the air introduction holes.