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Geogrids Slavros ZHD-P

Description

Slavros ZHD-P georids – geogrids are flat polypropylene grids with a rectangular cell are made by extrusion with subsequent biaxial orientation.

The "Slavros ZHD-P " geogrids are specially designed for use as reinforcing layers in the ballast section of a railroad bed, for use in structures that perceive high dynamic or static loads, as well as for construction on weak soils.

Key benefits and effects

Introduction to the pavement design of the “Slavros ZHD-P” geogrid allows to strengthen the ballast layer and prevent mixing of layers with the ground, as well as reduce

The geogrids of Slavros ZHDP are made by extrusion with subsequent biaxial orientation of high quality polypropylene granules. Also in the composition of the raw material is introduced at least 2% of carbon black to stabilize to the effects of ultraviolet radiation. The geogrids "Slavros ZHD-P " work under conditions of high dynamic and statistical loads, stabilizing the structure as a whole and increasing its operational properties.

Areas of use

∙ Construction of railway tracks (reinforcement of subbalanced layer)
∙ Construction of embankments on weak grounds (clay soils, wetlands of all types, soils of high humidity, wet peat and in permafrost conditions)
∙ Construction of reinforced ground support structures
∙ Construction of access roads

Main functions

The use of Slavros ZHD-P geogrid strengthens the layers of inert building materials with the formation of building structures with improved mechanical properties, which allows to increase the operational reliability and service life of railway and other structures or their individual elements, reduce the consumption of traditional building materials (crushed stone, gravel).

Effect, benefits

Studies have shown that the reinforcement of crushed stone with geogrids allows to increase the overall elastic modulus of the structure by 6–15%, reduce the value of tangential stresses in the layer underlying the geogrid by 25–80%.

The following tasks are solved:
∙ reducing the thickness of the base layer;
∙ · increase the service life of the coating by increasing the strength of the base layer;
∙ creation of conditions that exclude mixing of materials between the sandy layer of the road bed and the base layer;
∙ uniform redistribution of stresses from the rail and sleep grid to the main roadbed area.

Where is it used?

The geolattices "Slavros ZHD-P " are specially designed for use as reinforcing layers in the ballast section of a railroad bed, for use in structures that perceive high dynamic or statistical loads, as well as for construction on weak soils.

Railway construction

Biaxially oriented geogrids "Slavros ZHD-P " in railway construction are used: 
  • with insufficient bearing capacity of the main platform of the roadbed, which manifests itself in the form of splash and subsidence; 
  • in the grooves, passing in the area of wetlands;  
  • in the areas adjacent to the artificial road to artificial structures. 
The use of biaxially oriented geogrid "Slavros ZHD-P " allows you to:
  • reduce the load on the soil and increase the overall elastic modulus of the structure; 
  • reduce vibration effects on soils, forming slopes of the excavation; 
  • reduce the cost of construction of the railway; 
  • increase the time between repairs. 

The geogrids "Slavros ZHD-P " have the following positive qualities:

  • the technology of their laying slightly differs from the technology of laying geotextiles; 
  • the material has a high resistance to abrasion, which is important at high dynamic loads on the platform of the main blade from the rolling stock; 
  • have high tensile strength with lower elongation;  
  • have a high reinforcing ability due to the optimal size of the cells, allowing to wedge the crushed stone base and prevent the indentation of the soil; 
  • long service life allows the construction to operate several times between overhauls.

Installation technique

Technology of laying the geogrid polymer "Slavros ZHD-P" with deep cleaning of crushed stone during the reinforced repairs of the way

The static and dynamic loads acting on the main road area of ​​the railways have a significant impact on all lower layers. The roadbed is, in fact, the foundation of the superstructure. Violations in the design and in the geometry of the rail track entail a reduction in the quality indicators of the structure as a whole and affect the safety of rail traffic. Therefore, improving the reliability of work in the new construction, as well as strengthening the existing exploited roadbed is the most important and responsible tasks.

Since the 70s of the last century, the use of geosynthetic materials began, which greatly facilitate their solution. .

The element of the subgrade, directly under the moving load’s force is the fundamental base. It is often subject to deformations in the form of ballast troughs, lodges, etc., accompanied by the dilution of clay soil with splash from under the sleepers or the extrusion of the masses of this soil onto the surface of the ballast prism. The solution to this problem can be divided into two parts: the separation of layers (ballast and road bed) to prevent their mixing and increasing the carrying capacity of the main site of the road bed - reinforcement. The biaxially oriented flat geogrid “Slavros ZhD-P” successfully copes with these tasks. Such geogrids have high tensile strength in both longitudinal and transverse directions, high abrasion resistance, UV resistance. The material is delivered in rolls of 4 m wide, which allows stacking it in a mechanized way under the ballast with the help of crushed stone cleaning machines during scheduled repairs to the superstructure. With new construction, the geogrid can be rolled out manually.

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