| 摘要 |
<p>A fire rated dry wall ceiling support system having fixed, aligned main beam members spliced together in a manner so as to absorb longitudinal compression, as for example resulting from thermal expansion during a fire. Each main beam includes a web surmounted by a bead with flange portions extending laterally outwardly from the web. Each web end includes a tongue extending axially outwardly for locking engagement with the adjacent beam member web and is so configured that the tongues fold in a longitudinal manner and become laterally displaced out of the normal plane of the tongues when the beam members are longitudinally compressed towards one another. Accordingly, the bead means become laterally displaced while may in fact overlap one another in a longitudinal sense. The system further includes support channels disposed transversely to the main beam members and engaged therewith. The main beans include pairs of longitudinally spaced slots which receive the ends of the transverse cross channels from both sides of the main beam. The ends of the cross channels are locked in the main beam slots. The slots and cross channel ends are designed to absorb thermal expansion in the transverse cross channels during a fire situation. In addition the cross channels include a horizontal base portion which provides an effective mounting surface for dry wall ceiling panels.</p> |
