Metal gratings are divided into gratings (forge-welded gratings, press-locked gratings) and perforated metal planks.
Gratings are bearing capacity, plate-shaped bodies whose flat sides have many continuous openings in a regular arrangement, so that the free cross-section is usually over 70%. Gratings consist of vertical bearing bars arranged parallel to each other and crossed and connected by cross bars.
Perforated metal planks are C-profiles formed from sheet metal, which have differently shaped recesses and profiles on the surface. These profiles provide special stability and slip resistance.
The parallel bars bearing the load between two grating supports.
As a rule, a grating edging on all sides at bearing bar height. Parallel with the bearing bars = binding bar / banding in the direction of bearing bars; parallel with the cross bars = binding bar / banding in the direction of cross bars In this example, the binding bar / banding consists of a beaded band.
As a rule, a grating edging on all sides at bearing bar height. Parallel with the bearing bars = binding bar / banding in the direction of bearing bars; parallel with the cross bars = binding bar / banding in the direction of cross bars In this example, the binding bar / banding is flat.
A substructure is a structural component on which Gratings are laid. In this example, it rests on a C-profile.
Connecting bars transverse to the bearing bars, which are welded and/or pressed at the intersections with the bearing bars.
A deep binding bar is necessary if a balance needs to be created between the height of the Gratings and the insertion height. This is preferably achieved by a corresponding edge formation or a profile welded underneath.
Gratings may require cut-offs, bevels or cut-outs, which are then edged again.
Free span (bearing bar direction)
The dimension from center to center of the support. The free span is the clear dimension between two supports.
A binding bar / banding that protrudes above the top edge of the grating. It must be at least 100 mm higher than the top edge of the grating.
A binding bar / banding that protrudes above the top edge of the grating. It must be at least 100 mm higher than the top edge of the grating.
The outer dimension of a grating in the direction of the bearing bar. This dimension is also referred to as the length if it is smaller than the width.
The clear distance between supports and cross bars.
A notch in the bars on the support side. This is to achieve level compensation between the upper edge of the Gratings and the neighboring constructions. Care must be taken to ensure that the bearing capacity is maintained.
The dimension from center to center bearing bars and from center to center cross bars.
Panels welded to the sides of steps with holes for screwing to a stair stringer.
Small cutouts are designated as straight, angled and round cutouts that are smaller than 0.5 running meters. These are calculated as an allowance.
A spiral staircases is a special form of spiral staircase, as it has a central column to which the spiral steps are attached.
The planned support length must be at least 30 mm. In operating condition, the support length must not be less than 25 mm. Deviations are permissible if constructive measures are taken to prevent the grating from moving in the direction of support.
A substructure is a structural component on which Gratings are laid. In this example, it rests on a T-profile.
The external dimension of a metal grating in the direction of cross bar. This dimension is also designated as the width if it is greater than the length.
