Patent ID: 8657273

Claim:
A jig for positioning an inner tube and a transition piece of a combustor for a gas turbine when assembling the combustor, in a state where the transition piece is temporarily installed in the chamber, the jig comprising: an alignment member that has an outer circumferential shape which is substantially the same as an inner circumferential shape of the transition piece and inserted into the transition piece to determine an installation position of the transition piece; a support that is fixed to an installation portion of the chamber, where a top hat for retaining the inner tube is installed, by fastening a bolt; and a rod that is fixed to a center of the alignment member at an end with a longitudinal axis thereof being perpendicular to the surface of the alignment member and is fixed to the support at the other end, wherein an outer diameter of the outer circumference is smaller than an inner diameter of the transition piece so as to form a gap between the outer circumference and the transition piece, and the alignment member is a circular disk including a plurality of holes or concaves to reduce a weight of the alignment member.