Soundproof wall and steam turbine

Abstract

This soundproof wall is provided with: a frame disposed in an annular space on the outer circumferential side of a rotary shaft; a sound absorbing material supported by the frame; and a movement restricting member for restricting movement of the sound absorbing material toward an axial noise-source side which is the side on which a noise source exists. The frame is provided with a support plate part that extends circumferentially and spreads radially; an outer circumferential plate part that extends from a radial outer end of the support plate part toward the axial noise-source side and extends circumferentially, and an inner circumferential plate part that extends from a radial inner end of the support plate part toward the axial noise-source side and that extends circumferentially. The sound absorbing material is stored in a sound absorbing material storage space demarked by the support plate part, the outer circumferential plate part, and the inner circumferential plate part. The movement restricting member has a sound absorbing material pressing member that comes into contact with the sound absorbing material only at a position away from the outer and inner circumferential plate parts and that cannot move relatively to the support plate part in the axial direction.