At Melbourne Airport, a gantry supporting a signboard spans 26 meters between laced columns without intermediate supports. The box gantry alone weighs 8 tonne. Since the gantry would bend because of to its self weight, pre-camber of 170mm was provided at the middle.
For accurate representation, two models were created: one with pre-camber for assembly drawings and another without for general arrangement (GA) drawings. This approach ensures clarity in fabrication and erection, maintaining structural integrity while achieving the desired final alignment.
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