BEGRID TG Geogrid

Geosynthetics

Gerneral information about the BEGRID TG Geogrids


General information

Probably the most demanding range of applications for geosynthetics is the reinforcement of structures. The products used form the basis for safe and durable solutions that would not be possible using traditional earthwork methods or would be technically difficult and costly. For this reason, geogrids have been successfully used as a suitable reinforcing material in the construction of earthworks and infrastructure for many years.

The mode of action of the BEGRID TG Geogrid is simple and effective. Loads within the structure are distributed across a wide area by the geogrid before being transferred to the subsoil, thus avoiding any overloading caused by point loads. This avoids the need for costly and laborious earthworks, such as soil improvement measures or the replacement of soil with load-bearing material.

BEGRID TG Geogrids produce excellent results in terms of reinforcement. BEGRID TG is made from UV-resistant polypropylene (PP) membranes. In the production process, a predefined pattern of holes is punched into the membranes, which are then stretched laterally and longitudinally. This forms a dimensionally stable geogrid with low elongation.

The extremely robust and bending-resistant grid structures consist of monolithic ribs and intersection points. In contrast to other types of geogrid, no jointed nodes are formed during production. The geogrids are instead formed from a single piece of material. These typical product characteristics make BEGRID TG particularly well suited for use in civil engineering and road construction.

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The raw material, polypropylene (PP), used to make the BEGRID TG Geogrids also has high microbiological and chemical resistance in natural and contaminated soils. The robust material structure gives the geogrids good weather resistance and excellent resistance to damage during installation. These outstanding properties make the BEGRID TG Geogrid a durable and versatile reinforcement product.

BEGRID TG Geogrids, with their rigid nodes and good dimensional stability, are available in a range of mesh sizes and with tensile strengths of 13 to 40 kN/m. They are easy to lay on site and provide the design engineer with a diverse range of geotechnical system solutions.

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Functionality of the BEGRID TG Geogrids


Functions

Reinforcement

The effective action of BEGRID TG Geogrids is based on their ability to absorb high tensile forces while exhibiting low elongation and low creep. Since BEGRID TG Geogrids are installed between or beneath layers of soil to improve the mechanical properties of the layers, they have the particular advantage of allowing the grains of the subsoil and the fill material to interlock.

The inherent rigidity of BEGRID TG Geogrids creates the so-called “snowshoe effect”. The grains of the base course lock into the wide mesh structure of the grids below. The combined action of the BEGRID TG and the base course material results in a plate effect, which distributes and transfers the loads across an extended area.

This effect makes it possible to transform non-load-bearing surfaces into areas that can be trafficked or built on. In this way, even natural sludge ponds, sludge disposal lagoons, moorland, peat, mudflats and waterlogged soils can be built on without any additional and expensive technical measures.

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Plate effect due to interlock with the base course material

Technical consideration of the BEGRID TG Geogrids


Technical considerations

When selecting a geogrid, it is particularly important to ensure that the base course material interlocks well and does not just sit on top of the geogrid. The mesh size of BEGRID TG Geogrids is specially designed to ensure that the grains of base course materials can interlock optimally through the apertures of the geogrid and remain firmly in position.

Experience has shown that when employed with the classes of base course materials used in road construction, square grid openings should comply with the following requirements:


In order to ensure good interlocking with the geogrid, the fill material should be a mixture of well-graded, incohesive, mineral aggregates. The largest grain size should not be smaller than approximately half the mesh size and not larger than two-and-a-half to three times the mesh size.

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For BEGRID TG S products, with a square aperture width of 40 x 40 mm, we recommend the use of frost protection and bearing course materials 0/22, 0/32, 0/45 and 0/56 in accordance with the Terms of Contract and Guidelines for the construction of binderless layers in road construction (German designation: ZTV SoB-StB 04).
For BEGRID TG L products, with a mesh aperture of 66 x 66 mm, the largest grain size should not be smaller than 32 mm and not larger than 200 mm.

Improvement in load-bearing capacity due to BEGRID TG Geogrids
Directionally-independent absorption of forces

In order to assess the capacity of a stretched, rigid-node geogrid to absorb tensile forces acting in all directions, the so-called burst pressure test can be employed. This test involves tensioning the geogrid circularly on an air cushion (membrane). The air cushion is inflated, causing the geogrid to bulge.


The pressure is continually increased until the geogrid bursts. Because pressure is applied across the entire area of the test material, the burst pressure determined in the test gives a good reference value for the capacity of a geogrid to absorb tensile forces within its plane, independently of the material geometry.

These tests show that the loading capacity of stretched, monolithic, rigid-node geogrids with similar force-elongation behaviour is primarily determined by the rigidity of the nodes and the mass per unit area of the geogrid.

Berstdruckversuch
Calculation of the base course thicknesses and potential savings

Application areas of the BEGRID TG Geogrids


Applications

Geogrids are used primarily for reinforcing soils, stabilising surfaces and improving load-bearing capacities in the construction of roads and traffic infrastructure.


However, even in technically demanding applications, such as reinforcing steep embankments and support structures, building over sludge lagoons, constructing load transfer mattresses and installing securing layers in land slip areas, BEGRID TG Geogrids also offer safer and more cost-effective solutions than traditional construction methods.

Service roads, parking areas, cycle paths, construction site access roads and trafficked surfaces are also common fields of application.

Reinforcing layer under a dam
Several reinforcing layers
Reinforcing layer under roads with unbound surfaces (construction site access roads and service roads)
Separating and reinforcing a layer of replaced soil to improve the load-bearing capacity of the formation layer and to support vehicular traffic during the construction phase
Dam constructed on a widened, reinforced foundation bed for increased protection against slip and shear failure
Reinforced layer as soil replacement
Reinforced foundation bed as a bearing layer for pipelines

Advantages of BEGRID TG Geogrids


The advantages of BEGRID TG Geogrids:

  • Increased load-bearing capacity due to plate effect
  • Easy and cost-effective construction method
  • Immediately resilient and load-bearing subgrade
  • Prevention or reduction of costly soil replacement
  • Reduction in thickness of sub-base layer for traffic routes
  • Reinforcing effect in the foundation course
  • Evens out settlement
  • Effective friction/form fit connection with the fill material
  • High tensile strength with low elongation
  • Higher degree of safety and a long service life
  • Quick and simple installation
  • Low transport and storage costs
  • Robust, to cope with installation conditions on site Reduces rutting
  • Excellent chemical and microbiological resistance
  • Potential cost savings compared to conventional construction methods

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Installation information for BEGRID TG Geogrids


Installation information for BEGRID TG Geogrids:

  1. BEGRID TG Geogrids must always be laid without any wrinkles or folds.
  2. After the BEGRID TG Geogrid has been laid, suitable fill material must be placed on top of it.
  3. After the geogrid has been laid, vehicles must not be allowed to drive directly on it (before fill material has been laid on top). The geogrid must be covered with a layer of soil at least 15 cm thick before vehicles may drive on it. If the soil is particularly soft (with an Ev2 value of less than 15 MN/m²), the layer thickness must be increased to at least 30 cm.
  4. If the geogrids are laid on soil that has an Ev2 value of 15 MN/m², the geogrids must overlap by at least 30 cm and if the Ev2 value lies between 5 and 15 MN/m², the overlap must be at least 50 cm. For values of 5 MN/m² or less, please contact us for advice.
  5. If the subsurface is particularly uneven, the overlap width must be increased sufficiently to ensure that the minimum overlap is still assured after the fill material has been installed.
  6. In order to ensure good interlocking with the geogrid, the fill material should be a mixture of well-graded, incohesive mineral aggregates.

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Geosynthetics
Picture Mr Stefan Bermüller
Mr Stefan Bermüller

Sales Director Geosynthetics

Telephone: +49 (0) 911 64200-49stefan.bermueller@beco-bermueller.de
Picture Ms Julia Miederer
Ms Julia Miederer

Sales Geosynthetics

Telephone: +49 (0) 911 64200-31julia.miederer@beco-bermueller.de

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