Press-welded gratings

GEI 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.

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Characteristics

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, or greater on request.

Material

S235JR steel as per EN 10025 standards.
This product may be ordered in stainless steel depending on the quantities required.
Other options are available on request.

Surface treatment

Galvanised 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.

Assembly

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 :

Put in place the transverse bars and the bearing bars for electrowelding

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Step 2 :

Electrowelding

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Areas of application

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

Decorative
Sun shading
Fencing
Cladding
Urban furniture
Gangway
Multisports grounds

Technical infos

Structures

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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)

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MESCH 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.)

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BEARING BARS (BB)

Straight rods bearing the weight and arranged in rows at right angles to the transverse bars and supports.

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TRANSVERS BARS OR CROSS BARS (TB)

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.

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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...

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RANGE

Gap between the supports on which the ends of the bearing bars rest.

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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.

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SUPPORT BRAKET

Bracket welded to the ends of the grating rendering it suitable for certain uses (for example: shelving, guttering).

Material

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STEEL

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STAINLESS STEEL

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ALUMINIUM

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FRP

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RUBBER

Finishes

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"T" BANDING BAR

Bar which forms the outer frame of the panels.

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"FLAT" BANDING BAR

Bar which forms the outer frame of the panels.

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TOE PLATE

Straight metal welded onto the end of the grating

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RAISED BORDER

Straight metal welded onto the end of the grating

Serration

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SIMPLE ANTI-SLIP SERRATION ON BB

Various types of serration can be applied to bearing and/or transverse bars. Please note that this double serration option (for BBs as well as TBs) is only applicable to press-locked grating. Serration can only be applied to bearing bars for press-welded grating.

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