Auditorium strengthening - cage structure around the cylinder - this cylinder will now have to go all the way down to the basement level, with a perimeter footing 600x1000 as shown below.
Have a separate drawing showing the different steel cage treatments for different areas (front block, atrium, auditorium, fly tower); the atrium will be quite different to the other sections in this respect.
Walkway - steel beams (250mm) across the void with concrete topping (25mm), steel tray between.
Embed a short concrete beam within the cast concrete walls on either side to fix the walkway beams.
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