TECHNICAL INFORMATION |
LOAD DATA as per typical loading applications: Open Mesh
Grating
Load
Deflections are calculated over distance between Joist centres (i.e. 'Clear Spans'
+ thickness of joist.) (Refer
A1-B1 in diagram - click to enlarge)
|
|
2.5 Kpa
= Light Access Platforms & Conveyor Walkways
4.0 Kpa
= Standard Australian Platform Loading
5.0 Kpa
= Standard British Platform Loading
7.5 Kpa
= Boiler House & Power Station Platform Loadings
(1 Kpa is equivalent to a Uniform Load of
at least 100 Kgs per Square Metre.)
|
|
|
EnviroTread EnviroTread EnviroTread
EnviroTread
NB: [1] All dimensions in mm.
[2] Recommended Maximum deflection for Pedestrian Comfort is 5 mm.
[3] Envirowalk Mini-Mesh, Micro Mesh and Micro6.8 are all based on the same
40x40 main grid pattern, therefore the same load data applies through all
thicknesses of H22, H30 & H40 detailed in below tables.
All specifications are based on full
panels.
FRP MOULDED GRATING |
UNIFORM LOAD TABLE
Kpa: (Deflection
in mm) |
SPAN
|
MESH SIZE
|
HEIGHT |
2.5 Kpa |
4.0 Kpa |
5.0 Kpa |
7.5
Kpa |
610 |
Mini-Mesh |
22 |
1.80 |
2.80 |
3.20 |
4.90 |
38 x 38 Square Mesh |
25 |
1.27 |
2.04 |
2.55 |
3.83 |
Rectangular Mesh |
25 |
0.9 |
1.35 |
1.62 |
2.43 |
Mini-Mesh |
30 |
0.65 |
1.05 |
1.35 |
2.15 |
38 x 38 Square Mesh |
38 |
0.45 |
0.57 |
0.82 |
1.22 |
Mini-Mesh |
40 |
0.39 |
0.50 |
0.68 |
1.14 |
50.7 x 50.7 |
50.8 |
0.20 |
0.33 |
0.41 |
0.61 |
750 |
38 x 38 Square Mesh |
25 |
3.02 |
4.70 |
6.07 |
9.11 |
Rectangular Mesh |
25 |
2.10 |
3.40 |
4.20 |
4.90 |
38 x 38 Square Mesh |
30 |
1.40 |
2.60 |
3.90 |
4.50 |
Mini-Mesh |
30 |
1.34 |
1.92 |
3.20 |
4.15 |
38 x 38 Square Mesh |
38 |
1.00 |
1.40 |
2.25 |
3.00 |
Mini-Mesh |
40 |
0.95 |
1.35 |
2.12 |
2.80 |
50.7 x 50.7 |
50.8 |
0.65 |
0.90 |
1.30 |
1.80 |
914 |
Mini-Mesh |
30 |
3.22 |
- |
- |
- |
38 x 38 Square Mesh |
38 |
1.75 |
2.61 |
3.65 |
5.28 |
Mini-Mesh |
40 |
1.40 |
2.40 |
2.80 |
4.20 |
50.7 x 50.7 |
50.8 |
0.91 |
1.45 |
1.82 |
2.73 |
1000 |
38 x 38 Square Mesh |
38 |
2.45 |
3.80 |
4.80 |
- |
Mini-Mesh |
40 |
2.02 |
3.23 |
4.10 |
- |
50.7 x 50.7 |
50.8 |
1.37 |
2.19 |
2.73 |
4.10 |
1219 |
50.7 x 50.7 |
50.8 |
2.81 |
4.49 |
- |
- |
EnviroTread
EnviroTread EnviroTread EnviroTread
CONCENTRATED POINT
LOAD TABLE Kgs:
(Deflection in mm) |
SPAN
|
MESH SIZE
|
HEIGHT |
200 |
400 |
600 |
800 |
1000 |
1500 |
457 |
Mini-Mesh |
22 |
2.20 |
4.20 |
- |
- |
- |
- |
38 x 38 Square Mesh |
25 |
1.75 |
3.35 |
5.01 |
6.70 |
8.24 |
- |
Rectangular Mesh |
25 |
1.45 |
2.72 |
3.85 |
5.15 |
6.50 |
- |
Mini-Mesh |
30 |
1.25 |
2.70 |
3.90 |
5.20 |
6.50 |
- |
38 x 38 Square Mesh |
38 |
0.7 |
1.20 |
1.78 |
2.30 |
2.90 |
4.10 |
Mini-Mesh |
40 |
0.65 |
1.14 |
1.71 |
2.25 |
2.80 |
4.15 |
50.7 x 50.7 |
50.8 |
0.41 |
0.72 |
1.02 |
1.28 |
1.70 |
2.30 |
610 |
Mini-Mesh |
22 |
4.50 |
- |
- |
- |
- |
- |
38 x 38 Square Mesh |
25 |
3.63 |
- |
- |
- |
- |
- |
Rectangular Mesh |
25 |
2.94 |
- |
- |
- |
- |
- |
Mini-Mesh |
30 |
2.05 |
4.07 |
- |
- |
- |
- |
38 x 38 Square Mesh |
38 |
1.25 |
2.29 |
3.05 |
4.19 |
5.00 |
7.60 |
Mini-Mesh |
40 |
0.99 |
1.88 |
2.84 |
3.82 |
4.30 |
6.48 |
50.7 x 50.7 |
50.8 |
0.58 |
1.10 |
1.57 |
2.08 |
2.70 |
3.95 |
750 |
Rectangular Mesh |
25 |
5.85 |
- |
- |
- |
- |
- |
38 x 38 Square Mesh |
30 |
4.15 |
- |
- |
- |
- |
- |
Mini-Mesh |
30 |
3.92 |
- |
- |
- |
- |
- |
38 x 38 Square Mesh |
38 |
2.15 |
4.30 |
6.21 |
- |
- |
- |
Mini-Mesh |
40 |
1.91 |
3.72 |
5.58 |
- |
- |
- |
50.7 x 50.7 |
50.8 |
1.31 |
2.55 |
3.85 |
- |
- |
- |
914 |
Mini-Mesh |
30 |
5.21 |
- |
- |
- |
- |
- |
38 x 38 Square Mesh |
38 |
2.63 |
5.61 |
- |
- |
- |
- |
Mini-Mesh |
40 |
2.42 |
4.83 |
- |
- |
- |
- |
50.7 x 50.7 |
50.8 |
1.41 |
2.72 |
4.20 |
5.82 |
6.95 |
10.42 |
1000 |
38 x 38 Square Mesh |
38 |
3.55 |
- |
- |
- |
- |
- |
Mini-Mesh |
40 |
3.35 |
6.05 |
- |
- |
- |
- |
50.7 x 50.7 |
50.8 |
1.98 |
3.35 |
4.98 |
- |
- |
- |
1219 |
50.7 x 50.7 |
50.8 |
2.65 |
5.45 |
- |
- |
- |
- |
EnviroTread
EnviroTread EnviroTread EnviroTread
LOAD DATA: Grating
with Covered Top
(Deflection in mm)
UNIFORM
LOAD TABLE: COVER TOP GRATING |
Type |
Span |
2.5 kpa |
4.0 kpa |
5.0 kpa |
7.5 kpa |
H38+3 |
600 |
0.16 |
0.25 |
0.32 |
0.48 |
1000 |
1.2 |
2.0 |
2.5 |
3.7 |
1200 |
2.5 |
4.1 |
5.1 |
- |
1400 |
4.7 |
7.5 |
- |
- |
|
H38+5 |
600 |
0.13 |
0.2 |
0.25 |
0.38 |
1000 |
1.0 |
1.6 |
1.9 |
2.9 |
1200 |
2.0 |
3.2 |
4.0 |
6.0 |
1400 |
3.7 |
6.0 |
7.4 |
- |
|
H50+3 |
600 |
0.09 |
0.14 |
0.17 |
0.26 |
1000 |
0.7 |
1.1 |
1.3 |
2.0 |
1200 |
1.4 |
2.2 |
2.8 |
4.1 |
1400 |
2.6 |
4.1 |
5.1 |
7.7 |
|
H50+5 |
600 |
0.07 |
0.11 |
0.14 |
0.21 |
1000 |
0.5 |
0.9 |
1.1 |
1.6 |
1200 |
1.1 |
1.8 |
2.2 |
3.3 |
1400 |
2.1 |
3.3 |
4.1 |
6.2 |
NB: PRODUCT CODES FOR COVERED TOP GRATING:
To calculate the Product Code for a specified product please
affix the Dimensions as noted in the Height column to EnviroCT: (e.g. A
38+5 mm high Grating read as: EnviroCT38+5)
EnviroTread EnviroTread EnviroTread
EnviroTread
EnviroTread EnviroTread EnviroTread
EnviroTread
CORROSION RESISTANCE DATA
Corrosion
Resistance Guide for Moulded Grating |
RESIN: |
Type V |
Type I |
Type O |
Chemical Type |
Concentration
% |
Temperature
F/¡æ |
Concentration
% |
Temperature
F/¡æ |
Concentration
% |
Temperature
F/¡æ |
Acetic Acid |
50
|
180/82
|
50
|
125/52
|
5 |
77/25
|
Aluminium
Hydroxide |
100
|
180/82
|
100
|
160/71
|
ALL
|
- |
Ammonium
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
- |
Ammonium
Bicarbonate |
50
|
160/70
|
15
|
125/52
|
ALL
|
- |
Methacrylic
Acid |
99
|
95/35
|
- |
- |
- |
- |
Ammonium
Hydroxide |
28
|
100/38
|
28
|
N/R
|
ALL
|
N/R
|
Ammonium
Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
- |
Benzene |
100
|
92/40
|
ALL
|
N/R
|
ALL
|
N/R
|
Benzoic Acid |
SAT
|
210/99
|
SAT
|
150/66
|
ALL
|
77/25
|
Borax |
SAT
|
210/99
|
SAT
|
170/77
|
SAT
|
113/45
|
Calcium
Carbide |
ALL
|
180/82
|
ALL
|
170/77
|
ALL
|
- |
Calcium
Nitrate |
ALL
|
210/99
|
ALL
|
180/82
|
ALL
|
- |
Carbon
Tetrachloride |
100
|
92/40
|
100
|
N/R
|
100
|
N/R
|
Chlorine, Dry
Gas |
- |
210/99
|
- |
140/60
|
- |
N/R
|
Chlorine Water |
SAT
|
200/93
|
SAT
|
80/27
|
SAT
|
N/R
|
Chromic Acid |
10
|
150/65
|
5 |
70/21
|
5 |
N/R
|
Citric Acid |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
77/25
|
Calcium
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Copper Cyanide |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
77/25
|
Copper Nitrate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
- |
Ethanol |
10
|
155/82
|
50
|
75/24
|
10
|
77/25
|
Ethylene
Glycol |
100
|
200/93
|
100
|
90/32
|
100
|
104/40
|
Hydrofluoric
Acid |
10
|
149/65
|
- |
- |
- |
- |
Ferric
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Ferrous
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
86/30
|
Formaldehyde |
37
|
140/60
|
50
|
75/24
|
25
|
86/30
|
Gasoline |
100
|
180/82
|
100
|
75/24
|
100
|
95/35
|
Glucose |
100
|
210/99
|
100
|
170/77
|
ALL
|
- |
Glycerine |
100
|
210/99
|
100
|
150/66
|
100
|
- |
Hydrobromic
Acid |
50
|
150/65
|
50
|
120/49
|
18
|
- |
Hydrochloric
Acid |
37
|
150/65
|
37
|
75/24
|
10
|
86/30
|
Hydrogen
Peroxide |
30
|
150/65
|
5 |
100/38
|
5 |
N/R
|
Lactic Acid |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
77/25
|
Lithium
Chloride |
SAT
|
210/99
|
SAT
|
150/66
|
ALL
|
- |
Magnesium
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Magnesium
Nitrate |
ALL
|
210/99
|
ALL
|
140/60
|
ALL
|
86/30
|
Magnesium
Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Mercuric
Chloride |
100
|
210/99
|
100
|
150/66
|
100
|
104/40
|
Mercurous
Chloride |
ALL
|
210/99
|
ALL
|
140/60
|
ALL
|
104/40
|
Nickel
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Nickel
Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Nitric Acid |
20
|
130/54
|
20
|
70/21
|
20
|
N/R
|
Oxalic Acid |
ALL
|
210/99
|
ALL
|
75/24
|
ALL
|
N/R
|
Perchloric
Acid |
30
|
100/38
|
10
|
N/R
|
10
|
N/R
|
Phosphoric
Acid |
100
|
210/99
|
100
|
120/49
|
80
|
N/R
|
Potassium
Chloride |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Potassium
Dichromate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
77/25
|
Potassium
Nitrate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Potassium
Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Propylene
Glycol |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Sodium Acetate |
ALL
|
210/99
|
ALL
|
160/71
|
ALL
|
104/40
|
Sodium
Bisulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
- |
Sodium Bromide |
ALL
|
210/99
|
ALL
|
170/77
|
5 |
- |
Sodium Cyanide |
ALL
|
210/99
|
ALL
|
170/77
|
5 |
N/R
|
Sodium
Hydroxide |
25
|
180/82
|
N/R
|
N/R
|
N/R
|
N/R
|
Sodium Nitrate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Sodium
Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Stannic
Chloride |
ALL
|
210/99
|
ALL
|
160/71
|
ALL
|
104/40
|
Sulphuric Acid |
50
|
183/80
|
25
|
75/24
|
10
|
- |
Tartaric Acid |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
- |
Vinegar |
100
|
210/99
|
100
|
170/77
|
ALL
|
- |
Methanol |
10
|
183/84
|
N/R
|
N/R
|
N/R
|
N/R
|
Sea Water |
ALL
|
210/99
|
ALL
|
158/70
|
ALL
|
113/45
|
Distilled
Water |
100
|
180/82
|
100
|
170/77
|
ALL
|
86/30
|
Zine Nitrate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Zine Sulphate |
ALL
|
210/99
|
ALL
|
170/77
|
ALL
|
104/40
|
Remarks:
1. ALL refers to any concentration,
SAT refers to saturated solution, N/R means not recommended and
¨C means no information is available.
2. Tests from resin manufacturers and experiences
indicate that the resin can withstand the corrosion conditions listed above.
And the corrosion resistance data listed above is just for reference since
the real environments are beyond control.
3. If products are used in other environments not mentioned above, please
contact us. |
|
CUTTING AND INSTALLATION |
Cutting FRP grating is so much easier than cutting steel or alloys. It can be
performed on site with ease provided you have the facilities to use power tools
- Even a hand held hacksaw can be used if necessary!
Although the dust from FRP
grating is low toxic, as with any cutting
situation that may create a dust problem, it is important to wear dust
protective clothing and equipment such as dust masks.
|
|
Some of the tools commonly used to cut and smooth FRP Grating. |
|
|
Dust
Protection: Even though it has a very low
toxic content, cutting FRP products creates a very fine dust and it is
recommended to use full face dust protection similar to that shown here. |
|
|
Diamond
Tip cutting blade: To suit a circular saw
and/or an angle grinder as shown in the images below. Although a
segmented blade is shown and may be used, Envirowalk
prefers to recommend the continuous turbo rim cutting blade. |
|
|
Circular
Saw: A saw requiring a 184mm blade should
service most requirements. Best to use a wet saw where possible to
minimize dust cloud. |
|
| Reciprocating Saw with Masonry blade or Jigsaw
with ceramic blade (The latter for mesh less than 30mm thick) |
|
|
Angle
Grinder: It is advisable to have two: a
small (115mm) and a larger (180mm)
|
|
| Straight Edge Guide: This is
important when cutting diagonally across panels: It will help prevent the saw
or grinder 'kicking' off line. |
|
| Small sanding grinder: With a
40 grit Metal Flap disc, this can be used to clean off cut edges. |
|
|
Small
Paint Roller: Using disposable roller
sleeves. In areas of high corrosion it is advisable to apply a thin coating of
resin/Gelcoat to the exposed edges as added protection. The resin/sealer may
also be brushed on if preferred. |
|
|
NB:
A coarse bladed hacksaw can also be useful to trim off any undesired
protrusions of load bars. |
|
EnviroTread EnviroTread
HELPFUL HINTS
EnviroTread EnviroTread |
When placing panels over
a slight hump or change in angle in gradient that requires the panel to bend
downward, it may be possible to take advantage of the flexibility of FRP by
cutting a wedge groove on the underside of the panel to allow the panel to
conform to the required shape without excessive resistance. This reduces the
number of joining gaps. |
The following pictures illustrate the cutting for corners and cut-outs. |
|
When panels are cut evenly through the
axis of change in direction Mini-Mesh is ideal as the load bars match up and
the resulting odd shape apertures do not detract from it's aesthetic
appearance.
NB: Although edge bars can be bonded to
the cut edges of panels it is not recommended as they do tend to come loose
in a relatively short period of time: Bonding FRP edge bars does not have
same strength as welding steel to steel. |
|
Another means of changing direction is
to use cover (solid) top panels of equal thickness cut to wedge shapes: The
Lake Thetis walkway used 30mm thick (H30) 38x38 grid mesh in conjunction
with 25+5 cover top (i.e. H25 Mesh with 5mm flat plate bonded to the surface
and with grit anti-slip surface.)
|
Cut
outs around trees, rocks, or other obstacles is best performed by using a
reciprocating saw with masonry blade for panels more than 25mm thick or a
jig saw with ceramic blade for panels up to 25mm thickness.
Round off cut edges to
aid against injuries. To do this we recommend using a 40 grit metal flap
disc in a 127mm diametre grinder. Only light pressure should be used when
doing this.
|
|
EnviroTread EnviroTread
Kickboards:
EnviroTread EnviroTread |
When
kickboards are required along the top edges of walkways it is possible to insert
a Standard Mesh Type M Clip from the underside as shown in photo illustration.
The fastener Bolt/Screw would then be secured in a cavity that would reduce the
risk of tampering. (In the case of Mini-Mesh Grating it would be necessary to
either pre-drill the infill bars or use a suitable self-tapping fastener.)
The hole diameter in the Standard Mesh Clip
is 8.5 mm
.
|
|