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1. A gas turbine comprising:
a combustor chamber that houses a combustor unit configured to include a combustor that burns fuel to generate combustion gas for rotating a rotator; a turbine unit chamber that houses a turbine-side rotator, which is the rotator and rotates upon reception of the combustion gas; a compressor casing; a combustor casing that forms the combustor chamber inside thereof; a turbine unit casing that forms the turbine unit chamber inside thereof; a casing assembly that is configured to include the compressor casing, the combustor casing, and the turbine unit casing, in which
a first divided portion on a surface orthogonal to a rotation axis of the rotator is not formed in the combustor casing, but is formed downstream of the combustor casing in the flow of the combustion gas, anda second divided portion on a surface orthogonal to the rotation axis of the rotator is not formed in the combustor casing, but is formed in the compressor casing upstream of the combustor casing in the flow of the combustion gas; a turbine-unit rotor blade constituting the turbine; a cooling air chamber which is formed inside the turbine unit casing and outside of the turbine-unit rotor blade in a radial direction of the rotation axis, and is supplied with cooling air for cooling the turbine; a partition member that protrudes toward an inner periphery of the casing assembly along a surface orthogonal to the rotation axis and divides the cooling air chamber; and a turbine diaphragm which is disposed inside the turbine unit casing and is formed by protruding the partition member toward outside in the radial direction, wherein the compressor casing, the combustor casing and the turbine unit casing are configured to be divisible into a lower casing on a ground and a unitary first upper casing which is farther than the lower casing from the ground, when the gas turbine is installed, respectively, wherein flanges provided on each the lower casing and the upper casing are connected by a bolt, the first divided portion is a connected surface where an upstream side flange disposed at upstream side of the combustion gas flow in the casing assembly and a downstream side flange disposed at downstream side of the combustion gas flow in the casing assembly are tightly connected such that the upstream side flange and the downstream side flange contact with one another, the connected surface of the upstream side flange is disposed at a position corresponding to a downstream side circumferential surface of the turbine diaphragm where the partition member disposed inside the turbine unit casing protrudes outward in the radial direction, and the unitary first upper casing extends from the second divided portion to the first divided portion. |
