| 摘要 |
PROBLEM TO BE SOLVED: To provide a light and inexpensive casing of a steam turbine of which stress is reduced and rigidity is improved with a simple design change without increasing external reinforcement. SOLUTION: This casing structure of the steam turbine has an internal casing 7 and an external casing 1, and the external casing 1 is divided as an upper half and a lower half with a horizontal surface including a rotor shaft 3. A plurality of I type ribs 4A are arranged radially around the rotor shaft 3 in an end plate 2a of the upper half of the external casing 1, and the arranging angle is gradually increased from the vertical state to the horizontal state.
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