Metal frame at the top and the protective element consisting of 30 x 1 tonne, cables and a plastic net. Most work was completed behind (inside) the protective element, which prevented debris or wall collapse to the main rail corridor below. The wall to be demolished is a cavity brick wall behind the protective element in total 5 storeys high and twice as wide.
Initial demolition of the roof area behind the protective element. The metal frame was installed to attach 30 x 1 tonne cables and netting to form the protective element.
The demolition behind the protective element used a conveyor to remove 50 tonne of bricks. Care was taken to ensure no debris fell to the tracks below – only hand tools near the edge and a thorough clean up as we progressed.
The 8 corner spandrels each weighing 2 tonne were efficiently removed by crane.
Each spandrel dislodgement was a delicate operation.
The crane view from the top of the dump truck which transported the spandrels.
The spandrel dislodgement crew.
Every part of the tri-sign was lifted into place after fine tolerance adjustment of a few tenths of a millimetre, so that it is robustly held top and bottom.
The steel frame behind the tri-sign required very accurate survey definition as the floor and “roof” for each steel frame on each floor was rough and skewed in each plane.
The final touch to the corners.
The tri-sign almost finished. The plastic protection is to be removed from the cladding and the steel frame above is to be removed.
A train passes below the completed tri-sign – the largest in the Southern Hemisphere.