Press-Welded Gratings
High resistance guaranteed!
G.E.I press-welded gratings are manufactured by using electrofusion to attach cross-bars in a twisted square configuration to bearer bars. They are manufactures using techniques that guarantee a constant production quality (manufacture according to RAL GZ638) and are typically made from S235JR steel. The ensemble can be hot-galvanised in accordance with EN ISO 1461 standards. It is mainly used in the manufacture of industrial walkways and staircase steps.
Mesh
The mesh spacing is defined in accordance with the standards and loads that must be respected:
- Standard meshes: 30x30, 30x44, etc.
- Standard security meshes: 19x19, 19x40, 30x19, etc.
- EDF mesh: 30x27.
- Other options are available on request.
Bearer Bar
- Standard height: 25-60 mm.
- Standard thickness: 2-5 mm.
- Other options are available on request.
Cross Bar
- Twisted square: 4-6 mm.
- Smooth rounded configuration available on request.
Dimensions
- Maximum length of bearer bars: 6100 mm..
- Maximum length of twisted squares: 1000 mm, other options are available on request.
Material
- S235JR steel as per EN 10025 standards.
Surface Treatment
- Galvanized in accordance with EN ISO 1461 standards.
- Lacquered in accordance with standard RAL.
- Bituminous paint.
- Other options are available on request.
Finish
- The bearer bar may be notched on request.
Finished Product
- Custom manufacture based on the dimensions given by the customer or on plans drawn up by our research department.
- Plain or galvanised ½ laps, panels and staircase steps can be easily assembled on site.
Load tables
Press-welded grating is obtained by electrical welded transverse bars, which are usually square and twisted (but can be round and straight) into the bearing bars. The grating is produced with “flat” banding, and then optionally undergoes hot-dip galvanizing in accordance with the applicable EN ISO 1461 standards. For an optimised anti-slip surface, it is possible to produce serrated press-welded grating, with serration on the bearing bars only. It is typically manufactured from EN 10025 standard S235JR steel which ensures a consistent production quality. RAL-GZ 638 manufacturing tolerances applied.
STEP 1:
BBs and TBs fixed in place
STEP 2:
Electrowelding
Industry
- Thermal, hydro-electric, nuclear and solar power stations
- Chemical and oil industries
- Automotive and steel industry
- Shipbuilding
- Cement works
- Transformation and metallic construction
- Railings and fencing
- Emergency stairs
- Railway and transportation industries
- Drains and ventilation systems
Architecture
- Decoration
- Sun shadings
- Fencing
- Cladding
- Urban furniture
- Gangway
- Multisports grounds
Structures
Mesh
Spacing between bearing bars (BB) and transverse bars (TB). Mesh created in this way has two characteristics: mesh width and mesh centre spacing (pitch).
- Mesh width: the width of the opening that is between the BBs and TBs
- Mesh centre spacing (pitch): the distance between the centre of BBs and TBs (for example, the distance between the centre of one bearing bar and the centre of the nearest adjacent bearing bar
Mesh group | Type
Mesh is made up of two values (in mm), where the first dimension is the distance between adjacent bearing bars, and the second dimension being the distance between adjacent transverse bars (for example: 33.33 x 33.33; 33.33 x 11.11; 55.55 x 55.55; etc.).
For convenience’s sake, the term “mesh gauge” is more frequently used (for example: 30 x 30 - 30 x 10 - 50 x 50 - etc.)
Bearing bars (BB)
Straight rods bearing the weight and arranged in rows at right angles to the transverse bars and supports.
Transverse bars louvred
Arranged at right angles to the bearing bars, and bonded to the bearing bars by the exertion of high pressure (press-locked grating) or by electrowelding (press-welded grating). The transverse bars are manufactured respectively in “straight metal” or as square, twisted bars.
BB and TB gauge
This is defined by two values (in mm), where the first corresponds to their height and the second to their thickness. Gauge examples: 30 / 2; 30 / 3; 40 / 3; etc...
Range
Gap between the supports on which the ends of the bearing bars rest.
Impermeability – Security bars
Security mesh uses the following mesh gauge: 30 x 19; 19 x 30; 19 x 19; etc. It is recommended for industrial environments (14122 standard) and allows nothing exceeding a 20 mm diameter ball to pass through it.
Angle support
Bracket welded to the ends of the grating rendering it suitable for certain uses (for example: shelving, guttering).
Material
Steel
Stainless steel
Finish
"Flat" banding bar
Bar which forms the outer frame of the panels.
Toe plate
Straight metal welded onto the end of the grating
Raised border
Straight metal welded onto the end of the grating
Serration
Serration can only be applied to bearing bars for press-welded grating.
Simple anti-slip serration on BB
Specific applied standards
ISO 14122 : Permanent means of access to machines and industrial plants
ISO 14122-2 : Working platforms and walkways
ISO 14122-3 : Stairs, ladders and handrails
RAL-GZ 638 : Manufacturing tolerances for gratings
RAL-GZ 639 : Manufacturing tolerances for safety grids
EN ISO 1461 : Galvanisation requirements
EN 10025 : Steel standard
