Principle of grating manufacturing, basic terminology


  • Pressed floor gratings represent bearing panel-shaped construction elements earmarked by low weight and by high percentage of free area representing the lowest possible resistance to light and air passage.
  • Floor gratings are elements facilitating installation or, possibly, removal works with a high replaceability of individual construction parts whenever required by the operating conditions, and with excellent variability. If properly mounted, bordered pressed gratings are rigid in all possible shapes and, with properly selected materials and with a suitable surface treatment, are earmarked by a long lifetime.
  • Pressed steel gratings and stair steps LINEA have been certified by Technical Construction Certificate No. 070-024961 from 12.01.2005

PERFO LINEA a. s. - perforované materiály

Basic terminology

  • Design
    The design of our manufactured pressed gratings is based on the CSN 732611 and the DIN 245378 Standards .It´s characterized by fillings rods pressed in high-pressure pressing machines into special shaped grooves with locks cut out the bearing rods of the grating. Vertical position and stability of the bearings rods are maintained by the filling ones enabling an advantageous and uniform displacement of loads over all the grating area. The grating edges are provided with border strips welded to the grating circumference.
  • Grating length
    The bearing grating length is the external grating dimension measured in the direction of the bearing rods (this applies even in the case that the grating length is shorter than the width thereof).
  • Grating width
    The non-bearing grating width is the external grating dimension measured in the direction of the filling rods.
  • Bearing rods
    The bearing rods are parallel grating chords supported on both ends and used to transmit the forces induced by the grating load.
  • Filling rods
    The filling rods are chords sized as a rule to 10 x 2 mm maintaining the vertical position and stability of the bearing rods.
  • Mesh size
    The mesh size is the axial distance between two adjacent bearing rods and two adjacent filling ones.
  • Border band
    The border band is a steel band used as a border and reinforcement of the peripheral grating area; as a rule, the cross-sectional area of the border band is identical with that of the bearing rod of the grating.
  • Unidirectional Anti-Slip Arrangement
    Indentations cut out in filling rods creating an effective anti-slip grating arrangement.
  • Ambidirectional Anti-Slip Arrangement
    Indentations cut out in filling as well as bearing rods creating a highly effective anti-slip grating arrangement.
  • Bearing structure
    Supporting structure, as a rule steel or concrete construction, where gratings are anchored.
  • Cut outs
    Rectangular, oblique and/or bow-shaped apertures in grating structures cut out in accordance with the Customer drawing or sketch.
  • Step sides
    Staircase step sides made from flats and used to screw the step onto the staircase bearing structure (the string boards).
  • Treading Section
    Front-side shaped reinforcement section with upper side provided with anti-slip arrangement, in particular with drawn perforation.

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