| 摘要 |
PURPOSE: A square pipe is provided to reduce waste of resources and enhance intensity of joints. CONSTITUTION: A square pipe comprises a first pipe surface(11), a second pipe side(12), a third pipe surface(13), a fourth pipe surface(14), and a fifth pipe surface(15). The first pipe surface forms a bottom surface. The second pipe side accomplishes a left side by being bent in 90 degrees upwardly from the left end the first pipe surface. The third pipe surface accomplishes a right side by being bent in 90 degrees upwardly from the right side terminal of the first pipe surface. The fourth pipe surface accomplishes a part of an upper end of the second pipe surface by being bent upwardly upper part of the second pipe surface.
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