base plates] [rigidly secured to flange fittings] [bolted] [welded] to
structural metal. Ends of rails anchored to concrete or masonry shall be
rigidly secured to flange fittings anchored to concrete or masonry with
expansion anchors
2.2.2
Gratings and Cover Plates
Grating and cover plates shall be of the material and size shown, and shall
be fabricated in sectional panels of the width and length shown, or as
appropriate, to accurately fit within the supporting recess frames.
Openings through panels shall be provided as shown or as required. [Hinged
panels shall be provided with hinges of the type shown or suitable for the
application.] [Steel gratings and cover plates shall be galvanized after
fabrication.]
2.2.2.1
Grating
Gratings shall be as specified in paragraph FLOOR GRATINGS. Edges of
gratings and openings through gratings which require the cutting of more
than one bearing bar shall be banded. Fasteners shall be of the type
recommended by the manufacturer and approved. [Stair tread gratings shall
have nonslip nosings.]
2.2.2.2
Cover Plates
Cover plates shall be as specified in paragraph STEEL FLOOR PLATE. Cover
plate panels shall be provided with [holes for insertion of removal tool] [
mm 1/4 inch bar, flush, drop handles for removal] as shown or as required.
Sharp edges and burrs shall be removed from plates.
2.2.3
Steel Stairs
Steel stairs shall be fabricated and installed as shown. All materials
shall be galvanized after fabrication. Stringers, [columns] and other
structural framing members shall be of structural steel shown. Stringers
shall have exposed ends closed [and shall be continued around landings
which they support]. Stair treads [and landings] shall be fabricated of
steel gratings of the type specified in paragraph GRATING. Bolts, nuts and
other fastenings shall be provided as shown and as required for proper
installation. Lock washers shall be used under all nuts. [Railings of the
type specified above in paragraph RAILINGS shall be anchored to stairs as
shown.]
2.2.4
Recess Frames
Recess frames shall be fabricated of structural shapes of the type shown.
Welded joints in frames shall be ground smooth. [Steel frames shall be
galvanized after fabrication.] Frames shall be anchored to supports in the
manner shown and shall not be continuous across contraction or expansion
joints.
2.2.5
Ladders
Ladders shall be fixed-rail metal ladders conforming to the requirements of
EM 385-1-1 and to details shown. Ladders shall be fabricated of
[structural steel as shown and shall be galvanized after fabrication]
[aluminum as shown]. Fabrication of ladders shall consist of solid-section
rod rungs fitted into holes in bar side rails and welded. Splices in side
rails shall be made using full penetration welds and shall provide a flush
SECTION 05502A
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