republic of malawi I bar grating

Category:

republic of malawiI bar grating

Phone:400-888-8888

Inquire

Product Description

lighter, more economical and practical comparing to plain grating.

GENERAL INFORMATION OF STEEL GARTING

1、Bearing bar - Load carrying bar made from slit sheet, extending in the direction of the grating span.

2、Bearing bar pitch - The distance center to center of the bearing bars.

3、Cross Bar - The connecting bars, made from twisted bar、round bar or flat bar, which extend across the bearing bars.

4、Cross bar pitch - The distance center to center of the cross bars.

5、Length - The maximum dimension of a grating panel, measured parallel to the bearing bars, & in the same direction as the bearing bars.

6、Width - The maximum dimension of a grating panel, measured perpendicular to the bearing bars, & in the same direction as the cross bars.

RELATIONSHIP BETWEEN NUMBER OF BEARING BARS &NORMINAL WIDTH

	Norminal Width(mm)
NUMBER OF BEARING BARS	BEARING BAR PITCH (20mm)	BEARING BAR PITCH (30mm)	BEARING BAR PITCH (40mm)	BEARING BAR PITCH (60mm)
5	85	125	165	245
6	105	155	205	305
7	125	185	245	365
8	145	215	285	425
9	165	245	325	485
10	185	275	365	545
11	205	305	405	605
12	225	335	445	665
13	245	365	485	725
14	265	395	525	785
15	285	425	565	845
16	305	455	605	905
17	325	485	645	965
18	345	515	685
19	365	545	725
20	385	575	765
21	405	605	805
22	425	635	845
23	445	665	885
24	465	695	925
25	485	725	965
26	505	755	1005
27	525	785
28	545	815
29	565	845
30	585	875
31	605	905
32	625	935
33	645	965
34	665	995
35	685
36	705
37	725
38	745
39	765
40	785
41	805
42	825
43	845
44	865
45	885
46	905
47	925
48	945
49	965
50	985
51	1005

Remark: The width of grating in the table is calculated according to the thickness of bearing bar 5mm. When the thickness of bearing bar is 3mm,the related norminal width should subtract 2mm.

MATERIAL

1、Bearings bar &cross bar are made of Q235 which's in line with GB/T 700. Other materials can also be used according to customer.

2、Hot-rolled flat bar, hot-rolled strip or cold-rolled strip silt by slitting shears are available for bearing bar.

3、Tolerance for the size of hot- -rolled flat bar should be in accordance with the standard of YB/T4001.1-2019

Table 1 (Tolerance of bearing bar size) Unit (mm)

(Norminal Size		(Tolerance)
thicknesses(b)	3～5	±0.3
thicknesses(b)	>5～16	±0.4
width(d)	≤50	±0.4
	>50～75	±0.5
	>75～150	±1.0

4、Serrated bars are usually hot rolled flat bar with serration or puching the serration on hot rolled strip or cold-rolled strip，The serration pattern see picture 3，There are min 5 teeth within 100mm length.

5、The size of | section & cross sectional moment of inertia should be in accordance with the followingrequirements.

Table 2 (Section sizes&features of l-bar) Unit (mm)

H Steel bar height		A Width of flange		B Thickness of fiank		C Width of flank	d flange width		W Cm3	processiona moment of section cm4	Nom.Weight
Normina Size	Tolerance	Norminal Size	Tolerance	Norminal Size	Tolerance		Norminal Size	Tolerance	W Cm3	processiona moment of section cm4	Nom.Weight
25	±0.4	5	±0.3	3	±0.3	14	4.5	±0.5	0.48	0.6	0.75
32						18	6		0.78	1.25	0.96
38						22	7		1.1	2.08	1.13
44						26	8		1.46	3.22	1.3
50						31	8.5		1.84	4.61	1.46
50	±0.5	7	±0.4	4		31	8		2.57	6.43	1.98
55						35	8.5		3.09	849	2.16
60						37	10		3.72	11.22	2.39
65						42	10		4.29	13.96	2.55
75						48	12		5.7	21.39	2.96