Whether we are talking about industrial or home usage, the walking grids offer solutions for several problems.
We offer a wide range considering both the raw material and the technical content and most of our offer can be delivered straight from our warehouse, the rest based on the order to our partners.
Usage areas of the walking grids
canal and manhole covers, scaffolding supports, etc.
dividing walls, outdoor furniture, etc.
pavements for chimney sweepers, roof air conditioning, service pavements, etc.
walking surfaces, etc.
walking surfaces, etc.
single steps, etc.
Basic information regarding the walking grids
The walking grids are flat reliefed grid-structures made from different raw materials, composed from main and side ribs, which are suitable for sustaining loads. The load sustaining elements of the grids are always the main ribs which are made from suitably dimensioned steel strips (or other materials, e.g. stainless steel). The walking grids sustain load only in one direction (the one of the main rib). This is why it is primordial to mark clearly the length of the main rib: always the dimension of the first given sheet side. In order to avoid the risk of accidents due to the interchange possibility of the sides it is advisable to avoid designing square grids
In case this cannot be avoided then the suitable support of all the four sides is necessary.
Concepts -> more
The components and other basic concepts of the walking grids may be summarized as follows:
Main rib: the load supporting element of the grid, steel strip placed on its edge, with a cross-section chosen according to the load demand.
Side rib: does not take part in supporting the load on the grid, it stiffens the main ribs against turning and forms the grid picture together with them.
Dressing materials: do not take part in supporting the load, they are strip steel or steel sheets with special “U” or “T” profiles which close the rib ends and border the grid sheets.
Gridding: the distance between the main and respectively the side ribs. Several grid dividing variations are possible. Choosing the grid dividing to be used increases the freedom of the static design. It makes it possible to synchronize and optimize the demand regarding the loading and the actual load supporting capacity. Of course, the grid dividing has an important influence on the specific price beyond the static point of view.
The grid picture may be defined randomly by varying the main and side grid directional division.
Light dimension (grid dimension) the free (light) area bordered by the main and the side ribs.
Main rib direction: the concepts of width and length cannot be used in connection with the walking grids as these lead only to confusion and to products which cannot be incorporated. Instead the two main concepts are the main rib direction and the side rib direction. The main rib dimension which is the first one given from the dimensions of the grid sheet is measured from the support axis to the support axis, between the external surfaces of the bordering sheets perpendicular on the main ribs
Overhanging support (edge): on the lower area of the walking grid there can be shaped one or more overhanging bordering sheets with increased height and sheet thickness. The aim is to bridge the different heights or the cost effectiveness.
Edge slat (ankle slat): edge frame on the upper surface of the edge slat overhanging on one or more sides, which stop objects from falling.
Grid framed by angular profile: such grid to which angular profile was welded on one or more sides turned outwards and downwards. At these grids the angular profile is the load supporting, the grid is placed on them onto the building.
Quality of the materials -> more
The walking grids are usually made from hot and/or cold rolled unalloyed steel.
Besides the conventional steel raw materials the grids may be manufactured from stainless steel material and from aluminium.
Protection against corrosion -> more
The protection against corrosion of the steel grids is the hot dip galvanizing, which makes the products suitable for both outdoor and indoor use.
The hot dip galvanizing layer has to make up with the demands of the standard.
The pre-treated walking grids are coated with a galvanized layer with a cleanliness of min. 98.5 %, which ensures that in case of normal mechanical stress (e.g. traffic, drive-through) the galvanized layer does not come off.
Loading capacity -> more
The permissible loading of the walking grids has to determined from standard DIN 24537, that of the steps and the spiral steps from standard DIN 24531, taking into account the useful loads prescribed by standard DIN 1055.
The named DIN standards satisfy the MSZ 15021/1 domestic standard on the load support of the high building structures, together with those of the domestic standard MSZ 15021/1 and MSZ 15021/2 the rigidity of the high building structures as well.
Dimensional accuracy -> more
The demands regarding the dimensional accuracy of the grids and steps are stated in the standards DIN 24537, DIN 24531 and DIN 24530, in which further references can be found
In the absence of the domestic regulations, the regulations and directives are summarized by the RAL- GZ 638 of the German Walking Grid Manufacturing Association on the shape accuracy and manufacturing tolerances.
a = dimension of the sheet in the longitudinal direction of the main ribs (support direction); b = dimension of the sheet in the longitudinal direction of the side ribs; c = the division of the main ribs; d = the division of the side ribs; e = the height of the main rib; f = the thickness of the main rib
Walking grid types
Pressed walking grids – P -> more
The pressed walking grids are used in all the industries to form different buildings, floor platforms, pavements, walking surfaces and landings.
Due to their outstanding qualities they are suitable for the high building regulations as well. The wide range of the possible dimensions and formations make possible lots of usages. In case of loading by motor cars it is advised to incorporate grids with high load supporting capacity, while in case of presence of oily liquids, or snow and ice, to use anti-slip shaped grids. The pressed grids with dense division are used in public spaces, in front of the entrances of the buildings and in other such sites where the use of the basic grids is not possible. Besides their usage in the industrial and building industry sectors, the pressed walking grids can be used very well as facade grids, shadings, escape routes, covering grids, and as the covers for the gas heating convectors.
The unweakened side ribs are pressed with high pressure into the holding ribs which were previously cut to wedge shape. For this production process a press with a pressing force of 20.000 kN is used. The high pressure and the shape of the cuttings of the holding ribs guarantee a walking grid structure which is strong and has high convolution rigidity. The distribution of the loading is favourable. This is why the cuts, which may occur as a necessity later during the building operation influence very little the structural rigidity of the structure of the walking grids.
The pressed walking grids are manufactured according to the dimensions and strength demanded by the market, always at the given dimensions. In the transverse direction the manufacturing dimension cannot exceed 1400 mm.
The pressed walking grids made with holding rib of 20 x 2 mm to 40 x 3 mm are basically manufactured with T hemming, but U hemming or framing with flat strip may be ordered as well. The pressed walking grids with holding ribs bigger than 40 x 3 mm are framed with flat strips
Protection against corrosion
The finished welded walking grids are hot dip galvanized.
The flexibility of the manufacturing equipment makes it possible to produce the most different types of walking grids. Within the divisions it is evident that the rectangular grid division may also be chosen. There is the possibility of change within the basic division as well, e.g. the holding rib division is 22.22 mm, the side rib division is 33.33 mm.
It has to be taken into account that at the surfaces to be loaded with vehicles the maximum grid division according to the regulations cannot exceed 33 x 50 mm.
The thickness of the side rib at the 2 mm thickness of the holding rib is again 2 mm. Otherwise the side ribs are 1-2 mm weaker than the supporting ribs.
The side ribs are 10 or 20 mm high depending on the height of the supporting ribs.
From the type mark of the pressed walking grids the manufacturing mode is deducted (pressed), the supporting rib, the grid division and the framing. The anti-slip walking grids are marked with an X before the type marking (e.g. XP 330-33-3).
P: pressed walking grid
330: main rib ø 30×3 mm
33:main rib grid division 33.33 mm
44: side rib grid division 44.44 mm
3: frame ø 30×3 mm
In case of the same supporting and side rib grid division the grid division is given only once e.g. : P 330-33-3
The pressed walking grids as building elements are linked to the manufacturing programme in different shapes and finishes. These may be for example shading elements, spoilers, dividing elements, decorative elements and many others. The grids may be manufactured with 45° and 15° oblique side ribs.
We offer so called complete sieves as decoration element, for example, false ceiling, railing element, shading, that is such pressed grids at which the dimensions of the supporting grid and the side grid are the same. the complete grids are manufactured up to the material thickness of 3 mm and to the maximum building height of 60 mm.
The types of the pressed walking grids
Ultra finish: the surface of the main and the side ribs is smooth.
GS-finish: the main ribs, or the side ribs, or all the ribs are saw-toothed for the anti-slip finish.
GS1: saw-toothed side ribs.
GS2: saw-toothed main ribs
GS3: saw-toothed main and side ribs.
The side ribs do not take part in supporting the load, they only join and strengthen the main ribs against turning outwards.
Welded walking grids – SP -> more
The welded walking grids may be used at the industrial buildings as floor platforms, landings and floor elements for walking surfaces. The grids with greater load resistance are used in case of greater weighs arising from traffic. The anti-slip products are to used at sites which are polluted with oil and other oily materials.
The twisted or round side ribs are pressed with high pressure into the unweakened supporting ribs within a working corridor and at the same time they are welded using resistance welding procedure.
During the resistance welding procedure all the cross points are homogeneous, and due to the solid welding they are outstandingly solid, with the greatest possible resistance thus forming an optimal load-spreading walking grid.
Ability of cutting
The special structural characteristics of the welded walking grids make them outstandingly rigid against twisting and to be cut. Even at the later cuts which are usually unavoidable when mounting, the converging strength and the rigidity of the walking grids remains untouched in a high proportion.
The hemming of the welded walking grids stands of steel strips both in the direction of the main and of that of the side ribs. The frame is made of strips at the high load-bearing walking grids as well.
Protection against corrosion
The finished welded walking grids are hot dip galvanized.
The supplementary ribs welded onto the upper side of the walking grids give stable grip for the feet so this contributes to the increase of the security and to minimizing the workplace accidents.
According to the manufacturing process of the welded walking grids always the standard 1000 mm (in the direction of the side ribs) carpet (Matte) is manufactured. Due to the shrinking following the welding the effective width is cca 998 mm, which has to be taken into account when placing the grid. Besides the 1000 mm standard width, smaller special dimension can also be manufactured
From the type marking of the welded walking grids their manufacturing mode (welded), the supporting rib, the grid division and the framing can be determined. The anti-slip walking grids are marked with an X before the type marking (e.g. XSP 330-34/38-3).
For example: SP 330-34/38-3
SP: welded walking grid
330: main rib ø 30×3 mm
34/38: grid division 34×38 mm
3: frame ø 30×3 mm
Other technical terms regarding the walking grids
The division picture is influenced in an important manner by the different distance between the main and the side ribs respectively.
In all the tables the first dimension shows the distance between the main ribs, the second the distance between the side ribs.
The main ribs are load-bearing vertical flat steel strips, which are parallel from one support to the next one.
The side ribs are perpendicular on the main ribs and connect them with each other. The meeting points are pressed into each other, and in some cases they are strengthened by welding.
The sides seated on the supports are always the rib ends. The seat has to be equal with the height of the main rib but cannot be less than 30 mm.
Increased and strengthened upwards directional walking grid hemming.
All the grids have a hemming around them according to the regulations with T or U profiles.
Angular steel strip hemming
Angular steel strip welded onto the walking grid on one or more sides. The length of the angular steel strip has to be at least equal with that of the main rib.
Pinching back the ends of the main ribs and the hemming materials at the seats.
Cuttings on the grid or in the grid. The cutting below 0.5 metres is considered small figure cutting.
Walking grid hemming directioned downwards and increased for reaching a certain incorporating height.
Stair elements from walking grids
The steps of the stairs are made from the same type of grids as the pressed (P) or the welded (SP) walking grids. These are always delivered with anti-slip, perforated entry edge and welded side plate. Each step is made using protective gas welding so the slag forming can be avoided together with the deformation of the step. The steps manufactured this way have precise angles and dimensions
As the stairs are to be manufactured with negative tolerance according to the DIN standard and the stair structures are characterized by tolerances as well, before bolting it has to be examined whether there is a need for padding sheet between the supporting structure and the stairs. This way it can be avoided the damaging of the welding of the supporting ribs on the side plate.
Shaping of the longitudinal orifice
During the mounting in order to get easier positioning of the stair structure, the stairs are always made with a circular and a longitudinal orifice. The perforated entry edge increases the static value of the stair and shows in an optically favourable manner its first edge. This contributes importantly to the security.
If needed we deliver fixing elements for the stairs which comprise of the following:
– hexagonal screw M 12 x 35 ISO 4016 (DIN 601)
– hexagonal headed nut M 12 ISO 4032 (DIN 934)
– washer A 14 DIN 7989