Abstract: A first-stage stationary blade segment includes an outer ring extending in a circumferential direction, and a plurality of first-stage stationary blades attached on a radially inner side of the outer ring so as to be aligned in the circumferential direction. Each of the first-stage stationary blades has a blade body extending in the radial direction, and an outer shroud formed on a radially outer side of the blade body with respect to an axis. The outer shroud has a shroud main body, and an embedded portion connected to the radially outer side of the shroud main body. The embedded part has an embedded front end surface facing the side upstream along the axis, and an embedded rear end surface facing the side downstream along the axis. The outer ring has outer ring grooves into which the outer shrouds of each of the plurality of first-stage stationary blades is inserted.

Abstract: A stator blade segment includes a circumferentially extending outer blade ring, a stator blade extending radially inward from the outer blade ring, and a sealing member. The stator blade has a cavity that is formed in the interior of the blade and that communicates with the surface of the blade. The outer blade ring has a blade ring body and two blade ring protrusions. The two blade ring protrusions protrude radially outward from an anti-gas path surface of the blade ring body and face each other across a gap in an axial direction, and together with a casing, a drain recovery space is formed between the two blade ring protrusions. The blade ring body has a blade surface drain recovery passage that allows communication between the cavity and the drain recovery space. One of the two blade ring protrusions has a sealing surface.

Abstract: A vane segment includes a blade ring, a plurality of vanes, and a caulking member. The blade ring includes a blade ring groove and a storage space forming portion. The blade ring groove includes a convex portion projecting from a second groove side surface of the blade ring groove to the first side. The storage space forming portion, in combination with an outer shroud, forms a storage space into which the caulking member enters. The caulking member is accommodated within the storage space, contacts with the blade ring groove and the outer shroud, and is exposed from an inner opening of the storage space.

Abstract: A set screw (56) is provided, which has a screw main body (71), a male thread portion (75) which is formed on an outer periphery of the screw main body (71), and a drain hole (78) which penetrates a central portion of the screw main body (71) in an extension direction of the screw main body (71). The blade root ring (53) has a hole (63) which extends radially outward from an inner peripheral surface (53a) of the blade root ring (53), and a female thread portion (64) which is formed on an inner peripheral surface (63a) of the hole (63), and the set screw (56) is screwed into the female thread portion (64).

Abstract: A set screw (56) is provided, which has a screw main body (71), a male thread portion (75) which is formed on an outer periphery of the screw main body (71), and a drain hole (78) which penetrates a central portion of the screw main body (71) in an extension direction of the screw main body (71). The blade root ring (53) has a hole (63) which extends radially outward from an inner peripheral surface (53a) of the blade root ring (53), and a female thread portion (64) which is formed on an inner peripheral surface (63a) of the hole (63), and the set screw (56) is screwed into the female thread portion (64).

Abstract: A vane segment includes a blade ring, a plurality of vanes, and a caulking member. The blade ring includes a blade ring groove and a storage space forming portion. The blade ring groove includes a convex portion projecting from a second groove side surface of the blade ring groove to the first side. The storage space forming portion, in combination with an outer shroud, forms a storage space into which the caulking member enters. The caulking member is accommodated within the storage space, contacts with the blade ring groove and the outer shroud, and is exposed from an inner opening of the storage space.