| 摘要 |
PURPOSE: An entrance manhole for a large boiler is provided to apply a flexible corrugated section when the main body of the boiler and the same are contracted or expanded by heat from the boiler, thereby preventing the generation of cracks between the same and the entrance of the main body. CONSTITUTION: An entrance manhole (110) for a large boiler includes a casing part (210). The manhole is installed at an entrance (108) at the main body (102) of the boiler, and is opened and closed. The casing part is bound to the entrance of the main body so that the manhole is opened and closed. The casing part includes a casing (212) and a fixed member (220). The casing is fixed to the outer wall (104a) of the main body, and has a first through-hole (214) at a central part thereof. The fixed member is fixed to the inner wall (104b) of the main body, and has a second through-hole (222) at a central part thereof. A cover member (230) between the casing and the fixed member covers a space between the outer wall and the inner wall. |
