Stationary blade segment, gas turbine, and method for producing stationary blade segment

A stator vane segment comprising:

• a first stator vane;
• a second stator vane aligned with the first stator vane;
• and
• a joining tool that joins the first stator vane and the second stator vane to each other,
• wherein the second stator vane is positioned, with respect to the first stator vane, on a first side among the first side and a second side in a lateral direction in which the first stator vane and the second stator vane are arranged,
• each of the first stator vane and the second stator vane includes
• a vane body that is disposed in a combustion gas flow path and that has an airfoil shape, and
• a shroud that is provided at an end of the vane body in a vane height direction,
• a first shroud, which is the shroud of the first stator vane, includes
• a first gas path surface that faces the combustion gas flow path, and
• a first protrusion portion that protrudes toward a counter-flow path side, which is a side opposite to the combustion gas flow path, and that is positioned at a first end portion of the first shroud which is an end portion on the first side,
• a second shroud, which is the shroud of the second stator vane, includes
• a second gas path surface that faces the combustion gas flow path,
• a second protrusion portion that protrudes toward the counter-flow path side and that is positioned at a first end portion of the second shroud which is an end portion on the first side, and
• a third protrusion portion that protrudes toward the counter-flow path side and that is positioned at a second end portion of the second shroud which is an end portion on the second side, the third protrusion portion being joined to the first protrusion portion by the joining tool, and
• in a region aligned with the first protrusion portion in the lateral direction, a distance between a surface farthest from the first gas path surface among surfaces of a second end portion of the first shroud which is an end portion on the second side and the first gas path surface is smaller than a distance between a surface farthest from the second gas path surface among surfaces of the second protrusion portion and the second gas path surface.