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Truss manufacture

The main girders of the truss consist of 4-metre cylinders. These cilinders were rolled out of straight plates and then welded longitudinally. Bij means of a U-butt joint the cylinders were joined together to form girders of up to 60 metres in length. The main girders of the truss were supplied in 60-metre lengths. These sections were joined up at the construction site and the diagonals affixed between the girders. The diagonals of the open-frame consists of spiral-shaped welded pipes, constructed along the same lines as the cardboard tube inside a toilet roll.