This multi level stairway reaches approximately 56’ high
to the top of a storage silo. The stair is 60"diameter with
30 degree treads and several 60 degree rest landings. The
handrail is # 200 (1 1/2" round) tubing; balusters are a
# 302 (1" square) tubing, two per tread; and treads are a #
112 (3/16" thick) checker plate steel.
At every 1 1/2 turn of the stair is a rest landing with a guard rail
42" high from the tread to the top of the guardrail. The landing at the
top is a 90 degree square with handrails on two sides. The center column
is a 3 1/2" ID round, schedule 80 pipe. The stair was fabricated in one
section and spliced into four sections for shipping. The sections were
reassembled and welded together adding lateral supports from the stair
to the tower for extra support. The stair was shipped with a prime coat
and final paint coat was applied at the job site.