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1. A method for mounting a combustor component to a gas turbine casing, the combustor component having a mounting flange that extends in a radial direction with respect to a combustor axis and that is capable of being mounted to the gas turbine casing, the combustor axis extending in a combustor axis direction between a base end side and a tip side, the base end side and the tip side being opposite to each other, and a nozzle that injects fuel and is disposed on the tip side, with respect to the mounting flange, the method comprising: preparing at least one hanging jig for hanging the combustor component with a string material; mounting the at least one hanging jig to the mounting flange of the combustor component; hooking a string material on the at least one hanging jig mounted to the combustor component and hanging the combustor component together with the at least one hanging jig with the string material; pushing the combustor component so as to bring the mounting flange of the combustor component into contact with a combustor mounting position in the gas turbine casing by moving the combustor component to the tip side while maintaining a direction of the combustor axis direction in a state where the combustor component is hung; removing the at least one hanging jig from the mounting flange during the pushing of the combustor component and before the mounting flange of the combustor component comes into contact with the gas turbine casing; and mounting the mounting flange at the combustor mounting position of the gas turbine casing after the pushing of the combustor component, wherein the at least one hanging jig includes an adjustment member having a longitudinal direction which extends between a longitudinal direction first side and a longitudinal direction second side which are opposite to each other, the longitudinal direction first side being on the base end side in the combustor axis direction and the longitudinal direction second side being on the tip side in the combustor axis direction, a flange fixture that is mounted to an end on the longitudinal direction first side of the adjustment member, and mounts the longitudinal direction first side end of the adjustment member to a tip side surface of the mounting flange, and a hanging tool that is mounted to an end on the longitudinal direction second side of the adjustment member and has a portion that becomes a lower hanging point with which the string material comes into contact when the string material is hooked to hang the combustor component, wherein the adjustment member has a screw hole which is recessed from an end of the adjustment member on the longitudinal direction first side toward the longitudinal direction second side, wherein the flange fixture has a bolt having a screw shaft portion that can be screwed into the screw hole, wherein the mounting of the at least one hanging jig includes inserting the screw shaft portion into a bolt hole in the mounting flange, and screwing the screw shaft portion into the screw hole, wherein an intersection point between the combustor axis and a virtual plane that is perpendicular to the combustor axis and includes the lower hanging point is located on the tip side with respect to a center of gravity of the combustor component in the combustor axis direction when the at least one hanging jig is mounted to the mounting flange, and wherein in the hanging of the combustor component, the combustor component is hung so that a portion of the tip side of the combustor component with respect to the center of gravity is higher than a portion of the base end side of the combustor component with respect to the center of gravity.
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