| 摘要 |
PROBLEM TO BE SOLVED: To avoid concentration of stress by eliminating generation of structural disconnection at portions having large temperature differences, readily conduct checking of a pressure tight weld line, and reduce cost by simplifying structure so as to reduce the number of parts and welding portions. SOLUTION: A vertical channel 20a which communicates with an inner channel 19a of a downcast pipe 19 and a horizontal channel 20b which is communicated with an inner channel 18a of a manifold 18, are formed in an L shape between the lower end of the downcast pipe 19 and the base end of the manifold 18. A downcast pipe support member 20 which is formed by integrating a leg 20c into the L-shaped portion is bonded to the inside of a boiler duct 2.
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