Applications
Applications

BEGRID TG Geogrid

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.

This is why geogrids have been successfully used as a reinforcing material in the construction of earthworks and infrastructure for many years.

The mode of action of BEGRID TG Geogrids 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.

Your advantages

Reinforcing effect in the foundation course; evens out settlement

Increased load-bearing capacity due to plate effect; immediately resilient and load-bearing substrate

Quick and simple installation

Easy and cost-effective construction method

General

Soil reinforcement and surface stabilisation with BEGRID TG Geogrids

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 rigid 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 projects where the load-bearing capacity of the soil is poor.

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 15 to 40 kN/m. They are easy to lay on site and offer the design engineer simple and cost-effective solutions.

BEGRID TG Geogrids are available in a range of mesh sizes and with tensile strengths of 15 to 40 kN/m.


BEGRID TGV

Geogrids with additional non-woven filter fabric

When geogrids are used as reinforcement on soft, muddy soils, or in the vicinity of bodies of water, or where the groundwater level is high, a suitable non-woven fabric is required, in addition, to act as a separating and filtering layer. This fabric prevents different types of soil from mixing and avoids the risk of soil particle migration, while still allowing water to pass through.

The composite product BEGRID TGV was specially developed for this type of application. BEGRID TGV is made from the tried-and-tested geogrids of the BEGRID TG range, which are then fitted with an additional non-woven filter fabric in the factory.

The non-woven fabric satisfies the requirements of geotextile robustness class GRK 3, as specified in the “Merkblatt über die Anwendung von Geokunststoffen im Erdbau des Straßenbaues M Geok E” (Leaflet on the use of geosynthetics in earthworks for highway construction). It demonstrates good mechanical and hydraulic filtration efficiency in common types of soil.

The reinforcing properties of the BEGRID TG Geogrid are not adversely affected by the non-woven filter fabric. In fact, the advantages of the two components complement each other.

Since the geogrid and fabric are combined, there is less work involved on site than if separate layers were used. It also makes laying easier in cases where the subsoil cannot support heavy construction equipment and the “end tipping” method has to be used.

This is why BEGRID TGV is the ideal solution for construction site access roads, for sub-base reinforcement in roads and traffic routes in marshland or where the subsoil is muddy, and for the construction of pipe bedding on substrates with a low load-bearing capacity.

The BEGRID TGV Geogrid compensates in situations where the foundation soil varies greatly across the site.


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 fill material to interlock with the geogrid.

The inherent rigidity of BEGRID TG Geogrids creates the so-called “snowshoe effect”. The grains of the sub-base material interlock with the wide mesh structure of the grids below. The combined action of the BEGRID TG and the bearing 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, natural sludge ponds, landfill sites, moorland, peat and waterlogged soils can be built on without any additional and expensive technical measures.

BEGRID TGV with added non-woven fabric BEGRID TGV is supplied with a non-woven filter fabric that is bonded to the grid in the factory and conforms to geotextile robustness class GRK .

  1. Base course material
  2. BEGRID TG geogrid
  3. Subsoil with poor load-bearing capacity

Separation

The non-woven fabric of the BEGRID TGV composite geotextile keeps different layers or types of soil separated from each other in order to maintain the quality of the layer structure and ensure long-term use of the overall structure. In addition, the non-woven fabric ensures that the different layers, such as the high-quality sub-base layer and the subsoil, do not mix with each other under mechanical stress during the construction phase and the subsequent period of use.

Filtration

The filtering function of a non-woven fabric is necessary if, in addition to the separation of layers, the ingress of water needs to be taken into account. In this case, both the filtering and separating functions play an essential role. If the non-woven fabric is correctly dimensioned, the fabric and the soil combine to form a stable filter system.

The non-woven fabric of the BEGRID TGV was specially selected to ensure a suitable aperture size and the highest possible water permeability.


Technical details

Verzahnung der Schottertragschicht in der Gitteröffnung von Begrid TG Geogitter

When selecting a geogrid, it is particularly important to ensure that the sub-base material interlocks well and does not just sit on top of the geogrid. Soils that are too fine or too coarse are therefore unsuitable, e.g. peat. The mesh size of BEGRID TG Geogrids is specially designed to ensure that the grains of sub-base materials can interlock optimally through the apertures of the geogrid and remain firmly in position.

Experience has shown that when grids are used with the classes of base layer 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, non-cohesive, mineral aggregates. The largest grain size should not be smaller than approximately half the mesh size of the grid and not larger than two-and-a-half times the mesh size.

For BEGRID TG S products with a square mesh size 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 mm in accordance with the ZTV SoB-StB 04 (Terms of Contract and Guidelines for the Construction of Binderless Layers in Road Construction). For BEGRID TG L products with a mesh size of 66 x 66 mm, the largest grain size should not be smaller than 32 mm and not larger than 150 mm.

Berstdruckversuch zur Ermittlung der Zugkraftaufnahme des Geogitters

Directionally-independent absorption of forces

In order to assess a geogrid’s capacity to absorb tensile forces 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 maximum 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. This test makes it possible to determine the longitudinal stiffness at specific elongations, which helps in assessing the efficiency of the reinforcement.


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: 1. Bound upper construction layers | 2. Unbound upper construction layers | 3. Base layer | 4. BEGRID TG geogrid | 5. Subsoil with poor load-bearing capacity

Reinforcing layer under a dam

  1. Bound upper construction layers
  2. Unbound upper construction layers
  3. Base layer
  4. BEGRID TG geogrid
  5. Subsoil with poor load-bearing capacity
Several reinforcing layers: 1. Bound upper construction layers | 2. Unbound upper construction layers | 3. Base layer | 4. BEGRID TG geogrid | 5. Subsoil with poor load-bearing capacity

Several reinforcing layers

  1. Bound upper construction layers
  2. Unbound upper construction layers
  3. Base layer
  4. BEGRID TG geogrid
  5. Subsoil with poor load-bearing capacity
Overlaying sludge lagoons and organic soils: 1. Bound upper construction layers | 2. Unbound upper construction layers | 3. Base layer | 4. BEGRID TG geogrid | 5. Subsoil with poor load-bearing capacity

Overlaying sludge lagoons and organic soils

  1. Bound upper construction layers
  2. Unbound upper construction layers
  3. Base layer
  4. BEGRID TG geogrid
  5. Subsoil with poor load-bearing capacity
Reinforced layer as soil replacement: 1. Bound upper construction layers | 2. Unbound upper construction layers | 3. Partial soil replacement | 4. BEGRID TG geogrid | 5. Subsoil with poor load-bearing capacity

Reinforced layer as soil replacement

  1. Bound upper construction layers
  2. Unbound upper construction layers
  3. Partial soil replacement
  4. BEGRID TG geogrid
  5. Subsoil with poor load-bearing capacity
Reinforcing layer under roads with unbound surfaces (construction site access roads, service roads and access routes for site development): 1. Unbound upper construction layers | 2. BEGRID TG geogrid | 3. Subsoil with poor load-bearing capacity

Reinforcing layer under roads with unbound surfaces (construction site access roads, service roads and access routes for site development)

  1. Unbound upper construction layers
  2. BEGRID TG geogrid
  3. Subsoil with poor load-bearing capacity
Reinforcement layer to even out settlement: 1. Bound upper construction layers | 2. Unbound upper construction layers | 3. Base layer | 4. BEGRID TG geogrid | 5. Subsoil with poor load-bearing capacity | 6. Good load-bearing substrate or substructure

Reinforcement layer to even out settlement

  1. Bound upper construction layers
  2. Unbound upper construction layers
  3. Base layer
  4. BEGRID TG geogrid
  5. Subsoil with poor load-bearing capacity
  6. Good load-bearing substrate or substructure
Reinforced foundation bed as a bearing layer for pipelines: 1. Pipe bedding | 2. BEGRID TG Geogrid | 3. Unbound sub-base | 4. Subsoil with poor load-bearing capacity

Reinforced foundation bed as a bearing layer for pipelines

  1. Pipe bedding
  2. BEGRID TG Geogrid
  3. Unbound sub-base
  4. Subsoil with poor load-bearing capacity

Data

PropertiesTG 20 20 STG 30 30 STG 40 40 STGV 20 20 STGV 30 30 S
Product typeextruded Geogrid
Raw materialPolypropylene (PP)
Non-wovenwithoutGRK 3 – 170 g/m2
Maximum tensile strength longitudinal / transverse (kN/m)
Standard: EN ISO 10319
2030402030
Mass per unit area (g/m2)
Standard: EN ISO 9864
250350535420530
Junction Strength (kN/m)
Standard: GRI GG2
1827381827
Secant stiffness (kN/m)
at 0,5 % Elongation
7599891.499759989
Main fields of application
Earthworks and foundations
Road and traffic areas
Further fields of application
Road construction
Mud ponds and organic soils
Canal structures
Settlement equalisation
● suitable| ○ partly suitable (project-related assessment necessary)
Special types available on request.

Savings

The economical use of resources in road and traffic route construction no longer refers only to economic and ecological criteria in the deployment of construction equipment and personnel. Today, construction projects are subject to an overall sustainability assessment.

In a comprehensive study conducted by EAGM, the life cycle analysis of construction methods using geosynthetics revealed the ecological and economic advantages of geosynthetics in comparison to conventional construction methods. In the case of geogrids, in particular, enormous potential savings were identified. By using geogrids it is possible to largely or completely avoid conventional soil replacement.

The potential savings made, in comparison to soil replacement for example, can be up to 40 %, depending on the project. Added to this are the cost and time savings for excavation and disposal of the unsuitable soil and the provision, delivery and installation of replacement material. At the same time, all these savings also benefit our environment.

*The actual potential savings may vary depending on the boundary conditions of the specific project and on the frost resistance of the road pavement and the load-bearing capacity of the substrate.

POTENTIAL SAVINGS up to 40 %*
Example: Road construction class Bk3.2, row 1, Table 1 RStO (Guidelines for the standardisation of traffic area pavements), published 2012: With BEGRID TG Geogrids, the costs of at least 40 cm of excavation and disposal and of the delivery and installation of replacement material are saved.

Example: Road construction class Bk3.2, row 1, Table 1 RStO (Guidelines for the standardisation of traffic area pavements), published 2012

With BEGRID TG Geogrids, the costs of at least 40 cm of excavation and disposal and of the delivery and installation of replacement material are saved.

Improvement in load-bearing capacity due to BEGRID TG Geogrids

Example, based on a modulus of deformation EU = 10 MPa

Installation

  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.
    • BEGRID TG S: 0/22–0/56 mm
    • BEGRID TG L: 0/63–0/150 mm
  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 5 MPa), 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 MPa, the geogrids must overlap by at least 30 cm and if the EV2 value lies between 5 and 15 MPa, the overlap must be at least 50 cm. For values of 5 MPa 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 non-cohesive mineral aggregates with a defined grain size distribution.

Advantages

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

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