| 摘要 |
PURPOSE: A truss formed with roll forming is provided to manufacture a truss easily and to improve the installation efficiency of a truss. CONSTITUTION: The truss(20) is composed of upper and lower chords(21,22) formed by being bent in two or more bent parts of each end part, a web(23) formed in a center of a steel plate, and a perforated holes(24). A pair of unit members provided with the upper and lower chords(21,22) , the web(23), and the perforated holes(24) are contacted to be opposite mutually, and the projected upper and lower chords(21,22) are joined to be overlapped mutually to form a closed section.
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