Services
Open Type Grating
& Decking Solutions

  •  Forged Welded Gratings
  •  Press Lock Gratings
  •  
Punched Perforated Planking
  •  GRP

 Stairtreads
  •  Open Mesh Grating Type
  •  Durbar & Plate Type

 Handrailing
  •  Tubular Ball Standards
  •  
Solid Weld Ball Standards
  •  Welded Construction
  •  Architectural
  •  GRP Handrail
  •  Free Standing Handrailing
  •  Infill Panels

 Fabrication Services
  •  Access Platforms
  •  Stairs
  •  Associated Steelwork

 Fixing & Connectors
  •  
Kickflat Clamps - Kickgrip Range

  •  Q Clamp
  •  
Handrail Splice - HS Range

    Grating Fixings
  •  Cable Tray Clamps

 Downloads
  •  Standard Ordering Forms
  •  Handrail Standards
  •  Raking Standards
  •  Handrail Bends
  •  Wreath Bends
  •  Half Height Gates
  •  Full Height Gates
  •  Stairtreads
  •  Fabricated Grating

Introduction


Principles of construction


In a single operation twisted or round cross bars are pressed into solid bearing bars under high pressure and at the same time are fully electrically welded.

High Strength


Through the homogeneous welding of all intersections by the resistance welding process gratings of high stability, maximum strength and optimum load distribution are produced.

Section Stability


The special construction features of forge-welded gratings provide incomparable resistance to twisting and bending distortion. Even when cut-outs have been made later (which very often cannot be avoided during erection), stability is maintained to a high degree.

Banding


The gratings are banded at all sides. Banding are equal to bearing bar size (for automatic welding of the banding bar it has to have two stiffening corrugations).

The gratings are either produced having plain bearing bars or machine serrated bearing bars.

Length = direction of bearing bars (span)
Width = direction of cross bars (standard panel width being 1000mm)
E.G.
Size of grating = 800x1000mm
The first value is always the length

Design


The table below is a quick reference guide for standard 34/100 pitch gratings. The table illustrates the maximum clear span for typical load bars, taking into account all aspects of BS EN ISO 14122 & BS 4592-0: 2006+A1: 2012 (i.e. rolled down steel sections and 4mm max deflection) in addition to the design loads at the head of each column.

Glossary of terms




Load Bearing Bar

A longitudinal load-carrying section spanning between supports



Transverse Bar

A member fixed at right angles to the load-bearing bars to provide lateral restraint



Pitch

The distance centre-to-centre of load-bearing bars or centre-to-centre of transverse bars



Bearing Bar

A bar or section of at least equal thickness to the load-bearing bars, fixed to the edge or a flooring panel flush with the top of the load-bearing bars.



Deep Binding Bar

A bar or section fixed to the edge of a flooring panel and projecting below the underside



Length

(Direction of span) The overall dimension of a flooring panel parallel with the load-bearing bars. (This dimension is always referred to as ‘length’, even if it is shorter than the width).

Span

See Length



Width

The overall dimension of a flooring panel measured at right angles to the load-bearing bars. (This dimension is always referred to as ‘width’, even if it exceeds the length).



Curb Angle

A member fixed to concrete or supporting steelwork at the perimeter of a flooring area




Toe Plate (Kicking plate)

A flat bar around a cut-out or edge of a flooring panel projecting above the top of the load-bearing bars.



Cut out

An area of flooring removed to permit pipes,. Plant and structural columns to pass through, or to clear obstructions.


Wheel Load Tables




The tabulated values are valid for 34/38 forge-welded gratings. For other types of loading conditions or wheel contact areas, please contact our sales or technical office.
Call now for a quote: 01623 625211 alternatively click the request quote button to email us

Table to stop a 20mm diameter ball




Table of non-conforming gratings

The table below is for gratings which do not have to comply with BS EN 4592-02006+A:2012 Gratings where compliance with aperture restrictions to British Standards do not apply, or latest load criteria is restricted. (Please check compliance is not necessary before using!)



Note:- For the above UDL there is also a requirement for a concentrated load of 1.5 kN to be considered acting on an area of 200x200mm.

Application


The homogeneous combination of flat and twisted bars gives excellent strength to weight ratio and allows free passage of light, air and fluids. Furthermore these gratings have no rivets or crevices to hold dirt and debris which intensify corrosion.

 They are ideally suited to the following areas:-
  • Platforms
  • Walkways
  • Mezzanines
  • Ramps
  • Staircases
  • Industrial Floors
  • Wheel Load Applications
  • Racking
  • Fencing Panel
 Widely used in the following industries:-
  • Off and on shore oil production
  • Refineries
  • Mining
  • Power Stations
  • Civil Engineering
  • Cement Plants
  • Warehousing
  • Incineration Plants
  • General industrial use

Finish

  • Self-colour
  • Galvanised
  • Bitumen Coated
  • Powder Coated

Example for the layout area:


Divide the distance in accordance with standard panel width, this will leave a remaining width which should if possible take into account available production width. Clearance between the individual gratings is taken into account in production (approx. 2mm).

Safe Load Table to BS EN ISO 14122 & BS 4592-0: 2006+A1: 2012


Table to stop a 35mm diameter ball

Note:- To comply with these standards all grating must prevent the passing of a 35mm diameter ball, and where personnel are working as opposed to passing below the grating, it shall prevent the passing of a 20mm diameter ball.



Serrated load bar factor:


25mm deep grating   -   0.84 x safe load
30mm deep grating   -   0.87 x safe load
40mm deep grating   -   0.89 x safe load
50mm deep grating   -   0.92 x safe load

Forged Welded Gratings

Standards


Standard Width


Our process of forge welded gratings produces a standard width of 1000mm (nominal size).
Shrinkage after the welding procedure results in an actual width of approximately 998mm.

Production Dimension


Wherever possible we will make panels end at a load bar. See the table below for widths.

Forge-welded gratings in standard panels


Standard forge-welded panels are supplied 6100x1000mm (nominal size)

Production Table


Production width of forge-welded gratings has a bearing bar thickness of 5mm. Bearing bar pitch 30, 34 or 41. Gratings width = nominal size 1000mm (shrinkage approx. 2mm = 998mm). For bearing bar 3mm thickness deduct 2mm.