| 摘要 |
<p>FABRICATED OPEN WEB STEEL JOIST, AND MANUFACTURE THEREOF A fabricated open web steel joist is provided. The top and bottom chords of the joist are each formed of Lshaped angles, arranged in back-to-back relation; and the web is formed of a plurality of W-shaped pre-formed bar sections. Adjacent ends of each of the "W"'s are located between the opposed faces of the top chord. If the joist requires an odd number of panels, a "V" (a one-half "W") is inserted between two W's within the length of joint, usually at the centre thereof. The joist is welded, with each end and each apex of each "W" and "V" being welded to each of the chord components. The assembly of the joist includes the jig assembly and clamping of all of the components of the joist, welding only the adjacent ends of the "W"'s (and "V", if used) and the apexes of the "W"'s in the upper chord first, inverting the still clamped assembly, and welding the now upper located apexes in the bottom chord. The welding is carried out in a vertical-up manner, in each instance. SPE12191-1</p> |
