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公开(公告)号：US4606166A
公开(公告)日：1986-08-19
申请号：US733628
申请日：1985-05-13
摘要： A beam for a fire-rated suspended ceiling structure wherien the beam has an inverted-T construction and includes a central web having a bulb at the top and a pair of oppositely disposed flanges at the bottom for supporting ceiling tiles, and an improved expansion relief section of the beam comprising a section of the web having a pair of spaced vertical cuts in the web and an horizontal cut extending between the upper ends of the vertical cuts to form a tab extending upwardly from the pair of flanges, the tab having an inverted triangular cut-out portion the apex thereof adjacent the pair of flanges and dividing the tab into two portions, a pair of protuberances formed in the upper edge of the tab portion contacting the upper portion of the web, and a section of the bulb having a crushed portion opposite the apex of the triangular cut-out portion, the crushed portion of the bulb having a substantially Z-shaped configuration whereby when the beam is subjected to expansion forces accompanying fire conditions the Z-shaped configuration of the crushed portion of the bulb is compressed along the axis of the beam and the vertical cuts on the tab portion cooperate with the opposed section of the web to cause the flanges of the beam to bend downwardly adjacent the apex of the triangular cut-out portion to relieve the expansion forces without substantial twisting of the beam thereby avoiding displacement of the support for the ceiling tiles.
摘要翻译： 用于防火吊顶结构的梁，其中梁具有倒T构造，并且包括在顶部具有灯泡的中心腹板和用于支撑天花板瓦片的底部的一对相对设置的凸缘，以及改进的膨胀释放 所述梁的一部分包括所述幅材的一部分，所述纤维网的一部分在所述幅材中具有一定距离的垂直切口，以及在所述垂直切口的上端之间延伸的水平切口以形成从所述一对凸缘向上延伸的突出部， 三角形切口部分，其顶点邻近该对法兰并且将突片分成两部分，一对突起形成在接头与腹板的上部接触的突片部分的上边缘中，并且该灯泡的一部分具有 与三角形切口部分的顶点相对的破碎部分，灯泡的破碎部分具有基本上Z形的构型，由此当梁受到膨胀力时 在火焰条件下，灯泡的破碎部分的Z形构造沿着梁的轴线被压缩，并且突出部分上的垂直切口与腹板的相对部分配合，以使梁的凸缘向下弯曲 三角形切口部分的顶点以减轻膨胀力，而不会使梁的实质扭曲，从而避免了天花板瓦片支撑件的移位。
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公开(公告)号：USRE33501E
公开(公告)日：1990-12-25
申请号：US233633
申请日：1988-08-18
IPC分类号： E04B9/08
摘要： A beam for a fire-rated suspended ceiling structure wherein the beam has an inverted-T construction and includes a central web having a bulb at the top and a pair of oppositely disposed flanges at the bottom for supporting ceiling tiles, and an improved expansion relief section of the beam comprising a section of the web having a pair of spaced vertical cuts in the web and an horizontal cut extending between the upper ends of the vertical cuts to form a tab extending upwardly from the pair of flanges, the tab having an inverted triangular cut-out portion the apex thereof adjacent the pair of flanges and dividing the tab into two portions, a pair of protuberances formed in the upper edge of the tab portion contacting the upper portion of the web, and a section of the bulb having a crushed portion opposite the apex of the triangular cut-out portion, the crushed portion of the bulb having a substantially Z-shaped configuration whereby when the beam is subjected to expansion forces accompanying fire conditions the Z-shaped configuration of the crushed portion of the bulb is compressed along the axis of the beam and the vertical cuts on the tab portion cooperate with the opposed section of the web to cause the flanges of the beam to bend downwardly adjacent the apex of the triangular cut-out portion to relieve the expansion forces without substantial twisting of the beam thereby avoiding displacement of the support for the ceiling tiles.
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