10.4.1 Wall of Column Mounted

In the case of wall or column mounted jib cranes the jib arm, king post and bracing are assembled as a single unit. They may be over-braced or underbraced, depending on the intended use and installation location. Top and bottom bearing brackets fit onto the king post and these in turn are fixed to the supporting structure.

The design of bearing brackets varies with the intended use and may be provided with drilled bolt holes for wall mounting or clamp fixings for mounting onto or clamping around a column. Figure 10.4.1-1  (a) shows a wall or column mounted over-braced jib arm and Figure 10.4.1-1  (b) shows a wall or column mounted underbraced jib arm.

The angle of slew is limited dependent on the design of the bearing brackets and the supporting structure onto which they are erected. Wall mounted jibs are usually limited to 180° slew whereas a greater angle of slew may be obtained if the jib is column mounted. The angle of slew may be increased if the length of the bearing brackets is extended and can, in the case of column mounted jibs, be as great as 270°. Stops may be fitted to limit the angle of slew at any position within the arc of travel.