| 摘要 |
A grid tee and method of making the same comprising an elongated sheet me tal strip folded on itself to integrally form a lower double wall flange, a hollow upper reinforcing bulb, and a web extending upwardly between the flan ge and bulb, the flange generally lying in a horizontal plane, having oppose d spaced parallel edges extending longitudinally, and being perpendicular to the web, the web lying in a generally vertical plane, the strip having two longitudinal extending marginal edge zones, said marginal edge zones being g enerally vertically disposed and fixed at least at longitudinally spaced loc ations to a central area of the strip that forms a portion of the web and fo rming a double web layer area, the marginal edge zones of the strip being ve rtically spaced from one another such that a portion of the central area of the strip that forms a part of the web is a single exclusive layer. |
