| 摘要 |
PURPOSE: A construction flat board is provided to prevent a crack or a breakage and to receive more loads by flexibly meeting a physical change. CONSTITUTION: A flat board contains a vertical face(4) formed on one side of the flat board(1); an inclined face(5) inclined on the lower part of the vertical face; two tenons(3) protruded in the side; mortises formed at the center to be make the tenons inserted therein; and a groove(6) circularized when combining on each corner of the flat board. Thereby, the combining strength is improved by complexly forming connecting faces of the flat boards and the reliability of the flat board is improved by maintaining the first constructed state for a long time.
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