Forge-welded gratings

Continuous development at Lichtgitter has resulted in the most modern and advanced manufacturing facilities, ensuring the quality and accuracy of our forge-welded Grating products are of the highest possible standard.


Characteristics

  • Absorption of high horizontal forces by pressing and welding of all intersection points
  • High resistance
  • High bearing capacity, because bearing bars are not weakened by welding of cross bars
  • Good torsional rigidity even with subsequently introduced cut-outs - maintenance of the homogeneous unit
  • increased step security through twisted cross bars
  • Properties
    • Construction
      The forge welding process means the loadbearing bars are not weakened, and the twisted or round cross bars are pressed under high pressure in a single operation simultaneously,  and fully welded electrically.

      Cut resistance
      The special design features of these gratings make them unsurpassed in torsion and cut resistance.

      Banding
      Lichtgitter forge-welded gratings are edged in the crossbar direction with banding bars which have two ribs along their length ensuring the each load bar is twice welded to the edge bar, giving a safe and neat appearance to the grating panels.


  • Models/Types
    • Standard gratings
    • Forge-welded gratings are particularly suited for platforms, landings and walkways in plants of all kinds. They are characterised by particularly high load bearing capacity and good torsional rigidity.

    • Heavy duty gratings
    • Forge-welded gratings are particularly suitable as a heavy-duty grating. By pressing and welding to form a homogeneous unit of all intersection points, high shear forces can be absorbed. Depending on static or dynamic loading, heavy duty gratings can be provided depending on the clear span for many applications. As a rule, individual loads according to EN 1991 / DIN 1055-3 or DIN 1072 (already withdrawn) are to be applied to such loads. You may also download the following for more detailed information on the standard load cases and for dimensioning a suitable heavy duty grating. We recommend that you allow our experienced structural engineers who are familiar with the product to calculate special load cases.

    • Anti-slip gratings
    • Forge-welded gratings in anti-slip design are used in areas where there is a likelihood of increased risk of slipping. To counter this risk, all bearing bars are punched on the upper side in a special process. With this method, you achieve different rating groups according to BGR 181, which were confirmed by type approval testing for various types of gratings. Anti-slip gratings are marked with an "X" by the type selection (e.g. PX or SPX).

    • Special gratings
    • The latest generation of production machines allows Lichtgitter to provide gratings with bearing and cross bar pitches to meet all International Standards and special requirements. Almost any combination of aperture size can be accomodated to offer a solution to the designers needs.

    • Treads
    • Stair treads of forge-welded gratings are manufactured in accordance with DIN 24531-1 or based on this standard. They consist of a specially shaped and perforated nosing, a tread made of forge-welded gratings and perforated side panels. All stair treads are welded in special plants using the MAG process. The latest welding robots assist in this process. This production method guarantees a custom-fit size accuracy of the treads. To facilitate site assembly the end plates are provided with a plain hole and slotted hole each side. Perforated nosings increase the sustainability of stair treads and specifically mark the front edge visually. This contributes significantly to the safe use of a staircase.

  • Special designs
    • Offshore gratings
    • Lichtgitter offshore gratings have been specially developed for use on offshore platforms. In addition, round bars welded in the bearing bar direction reduces the given bearing bar pitch so as the falling through of a test ball having a diameter of 15 mm is prevented.

       

    • Forge-welded gratings with round cross bars
    • In individual cases, it may be advantageous that the cross bar is not twisted as in the standard version, but is used in round design. For these applications, specially shaped round bars are homogeneously pressed into the bearing bars and welded. The use of round bars reduces the adhesive or sliding friction so that a desired "sliding" is created. Such special gratings are found, e.g. in shelving systems, on park benches or in façade applications.

    • Forge-welded gratings with safety meshes
    • In this special version, forge-welded gratings are manufactured with perforated plates 28 x 1 mm with square holes 8 x 8 mm welded beneath.
  • Stock information
    • Lichtgitter forge-welded gratings are available as standard gratings, standard treads and panels from stock, so that you can respond individually, quickly and flexibly to supply shortages. We offer all standard types and versions with proven Lichtgitter quality from our extensive stock.

      Delivered within 2-3 working days


  • Fixing material
    • Fixing material B334K / B351K
    • for forge-welded gratings with locking
      Consisting of:

      • Clamp upper part
      • Bolt, nut and plastic locking ring
      Bolt length at least grating height plus 40 mm

      This fastening material prevents a slippage of the grating from the substructure even when the bolt is loosened and can be mounted from above. 
    • Threaded bolt fixings B433T
    • Consisting of:

      • Round plate top with firmly connected threaded sleeve made of brass or aluminium
      • Setting bolts.
      This fixing unit is also available completely in stainless steel.

      This fixing material prevents a slippage of the grating from the substructure even when the bolt is loosened and can be mounted from above. This fastening fits mesh spacing ranging from approximately 25 to 40 mm.
    • Welded Bolt Fixings B533K
    • Consisting of:

      • Clamp upper part deep drawn (on request with deep drawn plate)
      • Welded studs galvanized including ceramic ring
      • Nut and plastic locking ring
      This fixing material prevents a slippage of the grating from the substructure even when the bolt is loosened and can be mounted from above.

      This fixing fits mesh spacing ranging from approximately 25 to 40 mm. 
    • Clamp upper part XOK133
    • Consisting of:

      • Clamp upper part XOK 133 as an individual part for a direct mount
      As a connecting element on site, metric or self-tapping screws are to be used
    • Fixing with perforated plates B270
    • Consisting of:

      • welded perforated plate
      Screw fixing on site

      This fixing material is particularly suitable for vehicle-accessible gratings. 
    • Standard fixing material B133T and B133K
    • Consisting of:

      • Clamp upper part or round plate top
      • Clamp lower part
      • Bolt, nut and plastic locking ring
      This attachment is also available in stainless steel; Order no. B 132 K. Bolt length at least grating height plus 30 mm.

      This fixing material can be mounted from above from a mesh spacing of 33 mm and is - if desired - available with raised sill flap. Under the provisions of BG, only permitted if an additional on-site security against shifting is present. 
    • Hook bolt fixings B733T and B733K
    • Consisting of:

      • Clamp upper part or round plate top
      • Hook bolt, fitted to the substructure
      • Bolt M 8 x 90, nut and plastic locking ring
      The profile of the substructure must be specified. This fixing material can be assembled from above.
    • Hook bolt fixing B833T and B833K
    • Consisting of:

      • Clamp upper part or round plate top
      • Hook bolt, fitted to the substructure
      • Bolt M 8 x 90, nut and plastic locking ring
      The profile of the substructure must be specified. This fixing material can be assembled from above.
    • Double clamp fixings B933T & B933K
    • Consisting of:

      • Clamp upper part or round plate top
      • Clamp lower part - bolt, nut and plastic locking ring
      Bolt length at least grating height plus 30 mm. The double clamping connection connects adjacent gratings in places that are prone to greater deflections. It prevents the occurrence of tripping hazards. 
    • Plastic locking ring
    • leads to an improvement of bolt connection.

    • Safety hook / Fixing B11
    • Consisting of:

      • Safety hook with threaded end of stainless steel
      • Stainless steel nut
      • Screw anchor including plastic anchor plugs
    • Safety chain / Fixing B 12.1
    • Consisting of:

      • Securing chain, 500 to 1000 mm long
      • Screw anchor including plastic anchor plugs
    • Socket spanner lock / Fixing B13
    • Fixing B 13.1

      with square box spanner 7 including facing brackets. Version B 13.1 can be operated from above and from below. (Illustration: closed from above)

      Fixing B 13.2

      with square box spanner 8 including facing bracket (also for heavy-duty gratings) This version is available in galvanized steel and stainless steel.

      Fixing B 13.3

      with square box spanner 8 Can be bolted on to grating in subsequent installation. Suitable for gratings with a mesh spacing of 33.33 mm and grating height of 25, 30 and 40 mm.
    • Special socket spanner B 14
    • Fixing B 14.1

      with inside square for socket spanner closure No. 13.1 with square box spanner 7.

      Fixing B 14.2


      with inside square for socket spanner closure No. 13.2 and 13.3 with square box spanner 8.

    • Hinge B15
    • Consisting of:

      • 2 hinges and 1 hinge bolt
      • U-washers
      • 2 split pins
      Heavy hinge versions for vehicle-accessible gratings on request. The hinges are welded flush with the upper edge of the grating at an opening angle of approximately 90°. Larger opening angle can lead to a protuberance of the hinge.