| 摘要 |
<p>The roof truss is made up by gusset plates (15,16,17) holding the beams (8-11). The roof truss is placed on a table (1) supported on joists (2,2') mounted on legs (3). (3). The table is fitted under a powered roller (6) mounted horizontally over the truss. The table is fitted with vertical levelling jacks (21,22) with extension pads (23,24). The table is rigid to withstand the pressures without deformation.</p> |
