On plan the stair was a Nose shape so each floor to floor stair had 4 helical strings, 2 straight strings and a curved landing. The main stair support was curved SHS with a welded helical flat string which included notches removed for each step.
As the stair was so complex we had to draw the stair first using polylines and 3D polylines then convert the polylines to plates, curved beams and twisted folded plates.
“As the stair strings were helical with notches removed for each step, our client requested a flat plate development for each string. Without the twisted folded plate option it would have been extremely difficult to produce to the tolerance required”.
Advanced Draughting Services Ltd
∙ Beam from polyline
∙ Plate at polyline
∙ Twisted folded plate