Quality needs standards
Gratings in standard type
As a matter of course GI-RO Technik fulfils the requirements acc. to the German Standards Deutschen Industrie Norm. A precondition is modern machinery. So GI-RO Technik is producing the bearing bars and the cross bars on computer-controlled punching machines. Under high pressure cross bars are pressed into the load accepting bearing bars so that gratings with uniformly meshes and a plane surface are the result. The pressure-locked grating is banded with a special T-profile. The final galvanizing protects the grating against damaging environmental influences.
| Standard gratings with bearing bar thickness of 2 mm and 3 mm
Following a list of gratings with standard bearing bar heights for gratings with bearing bar thickness of 2 mm and 3 mm Height of bearing bar | Height of cross bar | 20 mm | 10/2 | 25 mm | 10/2 | 30 mm | 10/2 | 35 mm | 10/2 | 40 mm | 10/2 | 45 mm | 10/2 | 50 mm | 10/2 |
Special design:
Height of bearing bar = 60 mm
Height of cross bar = 15/3
(Bearing bar pitch = for example 33 mm)
(Cross bar pitch = 17 mm of 34 mm)
Material
Material acc. to EN 10 025
Material S-235JR (DIN 17100); FE 360B (ST 37-2)
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Standard pressure-locked gratings, serrated type (PR)
Standard gratings offer already a safe footing to a high level. They can be used in locations without any risk of slipping. However, in areas where oil, wetness and icing occur, serrated gratings are used to secure a perpetration of grating landings and gangways under extraordinary conditions. The requirements regarding serration for special risky areas are fixed in the instruction sheet for flooring in working areas with skid risk “BGR 181” (DIN 51 130). Walkways inclined from 10° to 24° should be provided with serrated gratings with an additional anti-slip metal strip.
Standard type / production procedure acc. to DIN 24537
The automatically punched 2 mm and 3 mm bearing bars are produced in standard length of 3000 mm. The cross bars which are running rectangular to the bearing bars conjoin the bearing bars with each other. The outcome of this are uniformly meshes and a plane surface. Following the valid instructions the support width at the end of the bearing bar should be preferably equal to the height of the bearing bar however, at least 30 mm. On the gratings-lay-out-drawings the bearing bar direction is marked with an arrow.
Standard grating / load table
for pressure-locked gratings with a bearing bar pitch of 33 mm
Load capacity for bearing bar pitches of 22 mm respectively 44 mm referring to the bearing bar pitch of 33 mm of the load table
Pitch of bearing bars | 20/2 | 25/2 | 30/2 | 35/2 | 40/2 | 25/3 | 30/3 | 35/3 | 40/3 |
22 mm | 1,48 | 1,48 | 1,48 | 1,48 | 1,48 | 1,48 | 1,48 | 1,48 | 1,48 |
44 mm | 0,75 | 0,75 | 0,75 | 0,75 | 0,75 | 0,75 | 0,75 | 0,75 | 0,75 |
Example for multiplication:
Values of the load table:
• Bearing bar 30/2
• Free span 1.000 mm
• Load F 10.820 N/sq.m
Question:
What is the maximum uniformly distributed load per sq.m at a bearing bar of 30/2mm and a distance between the bearing bars of 44 mm?
Result:
The necessary multiplication factor of 0,75 shows the following load value: 10.820 N/sq.m x 0,75 = 8.115 N/sq.m. In this case the load capacity was reduced due to the augmentation of the bearing bar distance.
Gratings support width:
The support width at the both bearing bar ends should be equal to the grating height however, at least 30 mm. The first mentioned dimension is the dimension of the bearing bar.
For example: 500 x 1000
500 mm is the bearing bar dimension.
On the drawings the bearing bar direction is marked with an arrow.
Addition charges for minimum sizes:
Below 0,2 sq.m plus 60%
From 0,2 sq.m to 0,3 sq.m plus 45%
Load table
for GI-RO pressure-locked gratings with a bearing bar pitch of 33 mm
efficient production:
Views of the production
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Statical calculations for gratings – quick and uncomplicated
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Survey of the meshes
DIN 24537
