Designing, Terminology

On the following pages, you can find information on gratings, surface treatment, dimensions, mesh widths and tolerances.

Design

Weland´s technical department is available for advice regarding dimensioning as well as the production of layout drawings and designs of different Weland products.

Selecting grating length and layout

When establishing layout drawings the panel size should be based on the standard width of the grating (1000 mm) to achieve best possible economy.

If the grating is to be laid across a number of support beams, choose a length of grating that spans across as many supports as possible. This results in less deflection under load, you get a pleasant overall pattern and a minimum number of joints.

Avoid square shaped gratings to avoid incorrect positioning of the load bearing bars (the load bearing part of the grating).

Tagging

Every panel is provided with a marking tag with distinct characters indicating reference to the layout drawing, which makes site fixing easier.

Presswelded grating, grating tolerances

Length, width and diagonal dimension

Maximum tolerances +0 -4 mm.

Maximum length of cross bar ends

2 mm.

Load Bearing Bar deflection

Max. load bearing bar deflection is 1/200 of the span.

Cross bar pitch

Presswelded grating, Mesh Sizes

Grating Type (mm)	Mesh size c/c AxB (mm)	Load bearing bar heights C (mm)
B9	12 x 100	20, 25, 30, 35, 40
N4	17 x 50	20, 25, 30, 35, 40
N6	17 x 75	20, 25, 30
N9, N9-T	16 x 100	20, 25, 30, 35, 40, 45, 50
D4	22 x 50	20, 25, 30, 35, 40, 45, 50, 60
D6	22 x 75	20, 25
F4	25 x 50	20, 25, 30, 35, 40, 45, 50, 60, 70, 80
H3	33 x 37	20, 25, 30, 35, 40, 45, 50, 60, 70, 80
H4, H4-T	33 x 50	20, 25, 30, 35, 40, 45, 50, 60, 70, 80
H6	33 x 75	20, 25, 30, 35, 40, 45, 50
H9, H9-T	33 x 100	20, 25, 30, 35, 40, 45, 50, 60
HN9-T	35 x 100	20, 25, 30, 35, 40, 45, 50, 60
J9	41 x 100	20, 25, 30, 35, 40, 45, 50, 60
JN9-T	41 x 100	20, 25, 30, 35, 40, 45, 50, 60
I6	66 x 75	20, 25, 30
I4	68 x 50	20
I9	100 x 100	20, 25, 30

A-Type Grating, Mesh Sizes

Grating Type (mm)	Mesh size c/c AxB (mm)	Load bearing bar heights C (mm)
A22x22	22 x 22	20, 25, 30, 40, 50
A33x11	33 x 11	20, 25, 30, 40, 50

Grating Dimensions presswelded grating

In the table, the construction dimensions in which the grating can be obtained (with full mesh) are set out.

Marked dimensions indicate standard width.

Example: An order for covering a gutter with grating type N, 1 each 600 x 16885 mm (grating measure) the grating is composed as follows: 16 panels 600 x 1000 and 1 panel 600 x 880 (880 is next to measure 885 in the table).

Grating Dimensions

= constructional dimensions with full mesh. Marked dimensions indicate standard width.

* c/c 34 applies to

Pedestrian walkway multipanels H3 25, 30 and 40
Pedestrian walkway multipanels H6 25, 30 and 40

as well as to

Type H3 25/2, 30/2, 40/2
Type H3 20/3, 25/3, 30/3, 35/3, 40/3, 45/3, 50/3
Type H4 20/3
Type H3 RF 50/3
Type H6 RF 25/2, 25/3

Grating dimensions for grating type
c/c measure = the distance between the load bearing bars

H c/c 33 (mm)	H RF c/c 33 (mm)	* c/c 34 (mm)	F c/c 25 (mm)	D c/c 22 (mm)	N c/c 16 (mm)	N c/c 17 (mm)	N RF c/c 16 (mm)	B c/c 12 (mm)	J c/c 41 (mm)	JN9-T c/c 41,6 (mm)	HN9-T c/c 35 (mm)
1000	995	1000	1000	1000	1000	1000	993	700	1000	1000	1000
966	958	962	973	972	982	983	976	685	957	955	961
933	925	927	949	950	966	965	960	672	914	915	926
900	892	893	923	928	949	949	943	659	872	874	890
867	859	858	898	906	933	931	926	646	830	832	855
834	826	825	873	884	916	914	909	633	788	791	820
801	794	790	849	862	900	897	892	620	745	750	785
768	761	756	825	840	883	880	876	608	700	709	750
734	729	722	799	818	867	862	860	596	662	668	714
700	696	687	774	797	850	845	844	584	621	626	679
668	663	653	750	775	834	827	828	571	580	585	644
635	630	618	725	753	817	811	812	559	540	544	608
602	597	584	700	731	801	793	795	547	500	503	573
568	565	551	674	709	784	776	778	535	456	462	538
534	532	516	650	687	768	759	761	522	416	421	503
500	500	485	625	665	751	742	745	511	375	380	467
469	467	451	600	643	734	724	729	500	334	338	432
436	434	417	575	621	718	707	712	485	293	297	397
403	401	383	550	599	700	690	691	473	252	256	362
370	368	348	526	577	683	673	674	460	211	215	326
337	335	314	500	555	665	656	657	448	171	174	291
304	302	280	475	533	649	639	641	436	130	132	256
271	269	246	451	511	632	622	625	424	89	91	221
238	236	211	426	490	616	605	609	411	48	50	185
205	203	178	401	468	600	587	593	399			150
171	170	144	377	446	583	570	577	387			115
139	137	109	352	424	568	553	561	374			80
106	105	75	327	402	550	536	545	362			44
73	72	40	302	380	534	519	529	350
40	37		278	358	518	502	513	338
			253	336	500	486	497	326
			228	314	483	469	481	313
			204	292	465	452	465	301
			179	270	449	435	449	289
			154	248	433	418	432	276
			130	226	416	400	416	264
			105	204	400	383	400	252
			81	182	383	366	383	240
			56	160	367	349	367	228
			32	139	351	332	350	215
				117	334	315	334	203
				95	318	298	318	191
				73	302	280	302	178
				51	285	262	285	166
				29	269	246	269	154
					252	229	252	142
					236	212	235	130
					220	195	219	117
					203	178	202	105
					187	160	186	93
					171	143	169	80
					154	126	153	68
					137	109	136	56
					122	92	119	44
					105	74	102	31
					89	57	85	19
					72	40	68
					56	23	51
					40		34
					24		17