Technical terms

BEARING BARS

Bearing bars are load-bearing, vertical flat bars which run parallel to one another from one support to the next.

 

CROSS BARS

The cross bars run at right angles to the bearing bars, connecting them together through compression and/or welding at the crossover points

 

EDGE BANDING

All grating is banded as a rule by flat bars, T-shaped sections or U-shaped sections.

 

MESH WIDTH

(a) the clear distance between the bearing bars or the cross bars.

MESH SPACING

(b) distance from centre to centre of bearing bars or the cross bars.

MESH SIZE

The mesh size is largely determined by the mesh spacing, whereby the distance between the bearing bars (BB) and cross bars (CB) can be different. In all tables the first value is the distance between BB, the second value is the distance between CB.

 

SUPPORT BEAM CENTRES

Is the centre-to-centre distance of the support in the direction of the bearing bar.

CLEAR SPAN

Is the clear distance between two supports.

Grating Supports

The section of the bearing bars which is supported by the substructure should have the same length as the height of the bearing bar but should not be below 30mm. In operation the grating support must not fall below 25 mm. Deviations are permitted if constructive measures prevent a displacement of the gratings in bearing bar direction.

Installation Tolerance

According to BGI 588 the gap between adjacent gratings should be 4 mm. In case edgings or shift protections prevent a larger installation tolerance it has to be guaranteed that the gap is < 20mm during operation.

CUT - OUTS

If the total length of the cutout is less than 0.5 mm, we call this a „Small Cut-Out“.

 

ANGLE COLLAR

A bracket welded on one or more sides to the grating. The span of the bracket should correspond at least to the height of the bearing bar in this version.

 

Z-SHAPED SECTION/MEISER SPECIAL ANGLE COLLAR

Angle section with two folds, similar to the angle collar, in which the section protrudes into a notch in the bearing bar.

 

DEEP BANDING

Reinforced and raised edge surround downwards, e.g. in order to achieve a certain installation height.

 

KICK PLATE

A raised surround plate, also known as a toe plate, is welded on, increases safety when walked on and protects against sliding at the grating edge. This is necessary if the clearance between the grating and the adjacent component is more than 30 mm.

 

NOTCHED BEARING BAR

Special notching of the bearing bars and the panel banding bars local to the support structure (notches should be not more than half the height of the bearing bars).

 

ANTI - SKID - PROPERTIES

Notching of bearing and cross bars to increase slip resistance.