The present invention relates to a method for installing a panel of a pressure part in a boiler for a thermal power plate. A steel frame structure of a boiler comprises: a pair of vertical members provided in parallel to each other; an intermediate member provided between the vertical members; a horizontal member for connecting the pair of vertical members and the intermediate member; and a reinforcing member which forms an entrance for a panel of a pressure part to be introduced thereinto, and supports a lower end of the intermediate member. Therefore, the assembly time of a panel for a pressure part can be shortened and the overall construction period of the panel for the pressure time can be reduced, by improving the workability for assembling the panel for the pressure part.
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