Road infrastructure

  • manhole covers
  • railroad and tramway crossings and crossings between station platforms

The manhole cover solutions offered by ZWG eliminate the causes of road degradation around them. This results from the use of rubber components that reduce dynamic effects of vehicles rolling over them on both their surface and the concrete elements of the shaft.

A cast iron manhole and rubber rings create a structure in which the manhole constitutes an inert mass and the rubber rings are rubber-spring components reducing shock loads created by road traffic.
A significant portion of the dynamic energy is dampened, radically reducing noise and vibration emitted and preventing degradation of the surface and the shaft.

Characteristics of specific solutions:
  • The use of vibration dampening components for the construction of manholes significantly improves the service life of the structure
  • their simplicity assure easy and quick inspections or repairs to the manhole as necessary,
  • while the use of modified conical concrete tapers assures longer service life of the concrete components by more effectively dispersing stresses.

Shown here is the structure of the shaft in two variants, depending upon the type of manhole.




Crossing surface on single-level crossings of railways and automotive roads.


Railroad or tramway crossing produced by ZWG, built from concrete tiles (forming the inert mass), filling the interior of a flexible rubber part. The flexible rubber part adheres tightly to the foot and the neck of the rails for the entire width of the crossing, and dampens vibration and noise. In the aim of limiting the possibility of shifting of the concrete tiles in relation to one another along the length of the crossing, they are connected with the use of an elastic connector that allows the tiles to be assembled in a modular fashion. The upper part of the rubber, which makes up the load-bearing surface is carbonised in the aim of increasing traction for the tyres of road vehicles.

Characteristics of specific solutions:

  • the organic construction works with the structures of both the railway and the road, ensuring more even distribution of static and dynamic loads,
  • lower pressures in the substrate (the ground) beneath the crossing are achieved, as well as limitation of the effects of dynamic loads transferred to the ground by rail and road traffic,
     the transmission of material vibration is limited, which is one of the causes of noise emitted into the environment during crossing by road and rail vehicles.
  • The use of this type of construction does not require refurbishment of the rail lines during its construction, and protects against penetration
    by water and contaminants to the railway ballast. It is also easy to maintain and repair.

The structure of the surface allows its assembly on rail lines that are curved, as well as on switches. Concrete tiles covered in a layer of rubber can be used in places where absorption of dynamic energy or noise is required, or in places where electrical voltages are present.

An especially important characteristic of rubber-coated tiles is their high abrasion coefficient, which is why they are used in places where oil may be spilled on the surface, and with the choice of the proper mixture, in places the danger of the formation of ice is present.

The tiles, with dimensions of 90x90x10 cm, may be produced as single- or double-reinforced with steel meshes (e.g. an upper grid of 8 mmm thickness, a lower grid with 10 mm thickness, and openings of 140 mm). The lagging of the grids is 3 cm, and the upper and lower lagging is 2 cm. In the calculations, a nominal wear resistance of 50 MPa was assumed. The surface of the tiles can be polished or covered with a 2 cm layer of rubber.


Technical approvals

CNTK technical approvals No AT/10-2002-0032-00
IBDiM Technical Approval No AT/2002-0401255 Construction components for IWINY-type railway crossing






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