Armac's Harry Ward completes first solo mission

Armac’s own Harry Ward, who recently completed his A61 appointed persons certification has completed his firs solo mission.

The demolition of an aerial mast, approximately 33m high of tubular steel construction which was diagonally crass braced up to a working platform. The mast had previously been constructed in sections obvious from the bolted connections between sections.

To establish an accurate weight the mast was surveyed by our in-house engineers. The frame was detailed up in AutoCAD and modelled for mass. This allowed for a fair estimate for the overall weight of the tower sections in each lift.

The lift area was surveyed to determine crane position for the overall lift and lay-down radius. Using calculated weights (3.5t with contingency), lift radius and required lift height a Liebherr 1070-4.1 (75t) was selected lifting at three points with a four leg chain.

The mast was cut into three segments to enable the tower to be laid down adjacent the lift. The mast legs and cross bracing had to be cut free using an oxy-propane torch.