| 摘要 |
<p>Two upright stem pieces are linked by a cross arm stem, and have bottom forward-protruding flanges, in the H-shaped cross-section of a profile girder. The girder is made of extruded aluminium, for supporting formwork, with a wooden batten filling the space above the cross arm. The girder (1) is open in the downward direction. It pref. has one or more wedge pockets, detachably fitted to the flanges (11,12) and bridging its underside. The flanges may be groove-shaped, opening upwards and the upright-stems (2,3) can have outward protruding brackets on them.</p> |
