In order to compensate for the axial displacements of the rotors of steam turbines occurring in operation by simultaneous displacement of the inner casing (11, 12) and, by this means, to keep the axial clearance between the stator and rotor blading rows constant, the inner casing (11, 12) of a double-casing turbine is supported in its outer casing (9, 10) so that it can be displaced relative to it. Lever pairs (18, 19), each having a two-arm displacement lever (20, 27), which is supported on bearing blocks (21, 28) fixed relative to the outer casing, and an expansion lever (22, 29) interacting with it are used for the displacement. An extension (.DELTA.l), occurring due to the operational heating in a section of length (1) of the inner casing (11, 12), between two bearing trunnions (23, 26) is transmitted by the expansion levers (22, 29) to the displacement lever (20, 27), whose pivoting about the bearing trunnion (26) in the clockwise direction achieves the necessary displacement (.DELTA.x, .DELTA.x2).