A long bolt (40) successively passes through the corner brace (30) and the horizontal frame (20), entering a corner brace (30) at the other end, and is connected to a blind nut (50) therein, and a long bolt (40) also successively passes through a corner brace (30) and the vertical frame (10), entering a corner brace (30) at the other end, and is connected to a blind nut (50) therein, while a long bolt (40) also successively passes through a T-shaped connecting tube (70) and a horizontal tube (61) of the window patterning (60), entering a T-shaped connecting tube (70) at the other end, and is connected to a blind nut (50) therein.
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