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For Better Understanding of Steel Grating

Steel grating is a kind of open steel member with its bearing bars & cross bars jointing at their intersections either by welding or by locking.

Steel Grating Mark

Note:
1. Bearing bar pitch: 30, 40, 60mm, of which 30, 40mm are recommended
2. Cross bar pitch:38, 50, 100mm, of which 50, 100mm are recommended
3. Sign of the shape of bearing bar:
F—Plain flat bar ( may be omitted in the symbol of steel grating )
S—Serrated flat bar
I—I Shape flat bar
4. Sign of surface treatment
G—Galvanizing (may be omitted in the symbol of steel grating)
P—Painted
U—Untreated

Definition of Steel Grating:

load bar

Load Bar(Bearing Bar)

Uniform load carrying bar spanning across supporting members.

cross bar

Cross Bar(Twist Bar)

Uniform rod, in square twisted steel, forged into and at right angles to the load bar.

edge bar.jpg

Edge Bar(Banding Bar)

Trimming Bar, generally of same size as and, Welded to ends of load bars across panel ends and around notches and penetrations (if any).

length of panel

Length of Panel (Span)

Overall dimension of panel measured parallel with load bars.

width of panel

Width of Panel

Overall dimension of a panel measured at right angles to the load bars.(Always called "width" even if greater than the length.)

serrations.jpg

Serrations

Small Notches made in the top edge of the load bar to assist in skid resistance.

nosing bar.jpg

Nosing Bar

A member attached to or on the leading edge of a stair trend to assist in skid resistance.

kick plate.jpg

Kick Plate

Heavy section flat bar welded to ends or sides of panels and around cut-outs. when specified ,Top edge to be 100mm above grating generally.

cut_out.jpg

Cut Outs

grating ares removed from panel to permit passage or installation of pipes. plant and structural and handrail items.

panel area

Panel area of a panel (W × L) excluding cutouts.

gross area

Gross Area

The total area of grating as shown on drawings using overall dimensions of grating including cutouts.

 

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