| 摘要 |
PROBLEM TO BE SOLVED: To dispense with repairing or peeling work of a door square frame fixed to a door opening in a concrete box in a replacement work of a door for shortening construction time for door replacement. SOLUTION: A door mounting frame 13 attached to an existing and intact door square frame 12 fixed to the opening 11 for the door of the concrete box for housing an outside installation type apparatus is constituted by a front frame 14 covering the existing door square frame 12 from outside the opening 11 and a back frame 15 covering it from the inside. These frames sandwich the opening 11 from both sides in a state covering the existing door square frame 12 for connecting them so that they are clamped and fixed to the opening 11.
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