گریتینگ(GRATING)

GRATING LENGTH, SPAN WIDTH or LENGTH OF LOAD BAR 

Length of grating = length of load bearing bar including binding bar. Span width = the distance between two support beams The grating can be laid over two or more support beams. On the drawing the load bar direction is marked 
 

 .The first figure of the panel dimensions indicates the load bar measure, e.g. 815 x 1000 mm.

GRATING Width of grating = length of cross bars WIDTH (LENGTH OF CROSS BARS)

GRATING  Grating height = height of load bearing
HEIGHT  bars
MATCHING  Panels can be laid out with matching cross
CROSS BARS  bars. Valid for panels with the same length
 of load bars
BINDING BAR  Flat bar welded to the ends of the load
 bearing bars connecting them together

EDGING STRIP  Has the same function as the binding bar,
 but usually only 15 mm high.
  

HIGH BINDING Binding bar higher than the load bearing BAR (KICK bars, projecting above the top of the PLATE) grating panel

LOW BINDING BAR  Binding bar wider than the load bearing bars, projecting below the bottom of the grating panel.
OPENING MEASUREMENT
 The actual measurement of the opening for positioning of the grating panel

PANEL MEASUREMENT
The exact measurement of the grating panel - must be 6 - 10 mm less than the opening measurement. Applies to both the length of the load bearing bars and the length of the cross bars.

INSIDE WIDTH
Measurement of the opening to be covered by the grating (distance between the inside edges of the support beams).

INSERT
 Grating cut to width other than standard width (500, 700 or 1000 mm)

CUT-OUTS
 Common term for all types of shaping of grating, see below 

STRAIGHT
Shaping at right angles to the load SHAPING bearing bars respectively the cross bars
 
CURVED SHAPING
Shaping other than at right angles to the load bearing bars. or cross bars

GROSS AREA
Total area of grating calculated on basis of our standard widths 500, 700 and 1000 mm.

WHY MULTIPANELS?

Forge welded grating is manufactured in form of mats Mats are that heavy that they are impossible to be having different lengths. These mats are very large, handled by one person. Cut-to-length is carried out by heavy and difficult to handle. means of angle grinder or gas jet.

Cut faces are rough, sharp and raw. If a binding bar A considerable portion of the mat has to be scrapped,is welded against, the rust protection is inferior to that an uneconomical method.of the grating.

.

Dimensions / Lay out

Grating length = length of load bearing bar incl. binding bar. The span is the distance between two supports. The grating should be laid over two or more supports to reduce deflection. When stating dimensions the length of the load bearing bar is indicated by the first figure, e.g. 810 x 1000 mm.
Grating Measurement

The grating measurement is the exact measurement of the grating. The grating must always be 6-10 mm less than the opening measurement. Applies to both length and width.
Width / Insert Piece
The standard width of the grating is 1000 mm. To achieve the full lay out measurement often an insert piece is required. The insert piece is cut close to the nearest load bearing bar. In this way the insert piece receives a binding bar all the way round. All cut faces have to be cold galvanized.
X 1000 1000 1000 1000

Surface Treatment
Weland stock grating is as standard hot dip galvanized in accordance with EN 1461.
 
STOCK SIZES

STOCK SIZES (length x width)

Load Alternatives
For the tables shown below the following applies: To the left of the boundary lines the deflection is <1/200 of the span at 5 kN/m2 uniformly distributed load.
Q = permitted uniformly distributed load (kN/m2). f1 = deflection at Qpermitted / deflection at 5 kN/m2 in mm.

Weland multipanels is easy to lay. Vehicular grating available for immediate laying.

Grating laid on stand of olympic ground at Lillehammar. Weland also stock hot dip galvanized kerb angle frames.
 

SPECIAL GRATING

FULL SIZE MATS
Weland manufacture many different types of grating in full size mats of 6 x 1 metre,

22
MESH OPENING SIZES 1:1

LOAD TABLES

Loading
In order to be able to choose the right type and dimen-sion of grating it is important to know the loading that the grating will be subjected to.
Below and on the following pages are extracts from load tables and descriptions of some simple rules. If your require additional information on this subject please contact Weland Limited.
Load group Calculated loading to NR
Dwelling load  2,0 kN/m2
(domestic rooms etc.)  
Small gatherings  2,5 kN/m2
(classroom, restaurant etc.)  
Large public gathering  4,0 kN/m2

(department store, exhibition hall, stands with seats etc.)
Heavy loading 5,0 kN/m2 (Terraces, light industry)
Calculation of Load
If grating type, span width and uniformly distributed load are known, the deflection allowed for can be calculated (1/200 of the span width) from the following formula:
Qpermitted = Qmax x fpermitted
f Qpermitted = uniformly distributed load permitted Qmax = maximum load permitted according to table f = deflection at Qmax. (according to table) fpermitted = 1/200 of span
Load alternatives
For all tables the conditions stated below apply. To the left of the boundary lines the deflection is less than 1/200 of the span width at 5 kN/m2 uniformly distributed load. An approximate guide for point loading can be obtained from part of linear loading. Example: Point loading Ø 100 mm. Take 1/10 value of the linear loading.

Load tables for some of Weland’s grating types and dimensions of load bearing bars

Weland large mesh grating can be put to a number of uses. For example security grating, gates, break in protection, fencing, ceilings, partitioning and display board stands.
Grating is available in 2 different mesh opening sizes and 3 load bearing bar depths. The material also can be made to measure.
The grating is hot dip galvanized as standard but can also be delivered powder coated
Length, width and diagonal dimension Cross bar pitch
Maximum tolerances +0 -4 mm max. 5 mm
Maximum length of cross bar ends 

Cross bar ends width +0 mmmax. 4 mm - 4 max. 4 mm
Complete clip
for joining two panels
Special double top clip + bolt + bottom clip + nut.
STOCK STAIRTREAD