30
Spiral staircase
Isometric
Section
PRECAST FAIR-FACE
CONC. STEP
PRECAST FAIR FACE!
CONC. STEP
X
1/2"x 1/2" HARD RUBBER STRIP
L
T
14" HOLE
3!6"
Plan of precast r.c.c. tread
Elevation
Section X - X
AG.LPIPE
SCALE
3
4 FT.
X
22"
L
I" G.I.PIPE 22 DIA. 1/8 THICK
PLATE WELDED TO "G. I. PIPE -
3"]
"WASHER
I NUT
Far East BUILDER, February 1969