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Technical parameters of gratings

Pressed gratings are manufactured in dimensions agreed upon by the manufacturer and recipient upon order placement. As a standard, however, the maximum dimensions of pressed gratings manufactured on the TERMETAL line are a width of 2000mm and a length of 2500mm.

Bearer bars used for the production of pressed gratings can be 20 – 50mm high and 2 – 5mm thick, while transverse flat bars reach heights of up to 10 – 15mm and thickness of 2 – 3mm.

The division of squares used in pressed gratings is presented below:

where: a – axial spacing of bearer bars, b – axial spacing of transverse bars.

It is also possible to manufacture TERMETAL gratings and pressed steps in a module other than the specified basic modules using a multiple of 11.1 mm.

Fig. Assortment of TERMETAL pressed gratings according to the square size

h – height of the bearer bar
g – thickness of the bearer bar
h – height of the transverse bar
g1 – thickness of the transverse bar

Fig. 2. Steel grating

Pressed grating frames

Pressed gratings can be used with both pressed and welded frames.

The most frequent method of this kind of framing is pressing on the four sides of the frame made of T sections up to 3 mm thick that are welded at the corners. The welds are made at the four corners from the bottom so that they cannot be seen.

Serrated pressed gratings

In an environment with an increased risk of slipping (snow, lubricants, oils, sloping ground), serrated gratings can be used. Serration takes place by slotting the steel tape in the form of a trapezoid or a sawtooth. In pressed gratings, serration can be made on bearer bars, transverse bars or on both.

Table of loads for pressed gratings

Fig. Characteristic load bearing capacity of TERMETAL pressed gratings for the scale of a=33.3mm

Fv – value of continuous load, daN/m2,
Fp – value of concentrated load on the surface of 200×200 mm, daN,
fv – deflection under load Fv, cm,
fp – deflection under load Fp, cm

Coefficients for calculating load values for gratings with the scale of a

Fv – value of continuous load, daN/m2
Fp – value of concentrated load on a surface of 200×200 mm, daN

Values of grating resistance with a scale other than 33.3 mm must be calculated according to the pattern:

value of grating resistance with a scale a=33.3 according to the table
x coefficient for the selected scale
= value of resistance for the grating with the selected scal

Fig. The pattern for calculating the load-bearing capacity for TERMETAL pressed gratings with a scale other than a = 33.3 mm

Fv – value of continuous load, daN/m2,
Fp – value of concentrated load on the surface of 200×200 mm, daN,
fv – deflection under load Fv, cm,
fp – deflection under load Fp, cm