| 摘要 |
<p>The beam can serve as a column, truss, girder, jamb or other structural member whereby an entire structure can be built using the same basic beam for all of the structural members. It comprises a unitary, elongated rigid beam having a pair of parallel, opposed channel-shaped portions connected by a pair of spaced walls positioned inwardly from the sides of the channels to define a longitudinally extending slot and a pair of opposed recesses. One channel member has an open face to provide access. A metal or plastic rectangular shaped tube is inserted in the longitudinal slot to provide extra strength and facilitate interconnecting of the structural members.</p> |
