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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.
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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.
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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.
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The 8 corner spandrels each weighing 2 tonne were efficiently removed by crane.
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Each spandrel dislodgement was a delicate operation.
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The crane view from the top of the dump truck which transported the spandrels.
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The spandrel dislodgement crew.
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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.
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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.
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The final touch to the corners.
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The tri-sign almost finished. The plastic protection is to be removed from the cladding and the steel frame above is to be removed.
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A train passes below the completed tri-sign – the largest in the Southern Hemisphere.