BEGRID TG Geogrid

BEGRID TG Geogrids provide reliable reinforcement of structures and enable uniform load distribution even on soils with low bearing capacity.

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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 easy installation

Easy and cost-effective construction method

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General

The reinforcement of structures represents one of the most demanding application areas for geosynthetics. The objective is to create durable and safe solutions that would either not be feasible using conventional earthwork methods or would involve considerable technical and economic effort. For this reason, geogrids have been successfully used for many years as reinforcement materials in earthworks and infrastructure construction. As reinforcement products, BEGRID TG Geogrids deliver excellent performance.

BEGRID TG 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.

Die sehr robusten, steifen Gitterstrukturen bestehen aus monolithischen Rippen und Kreuzungspunkten. Im Gegensatz zu anderen Geogitterarten entstehen produktionsseitig keine zusammengefügten Knoten. Sie sind vielmehr aus einem Stück gefertigt. Durch diese charakteristische Produkteigenschaft eignet sich BEGRID TG besonders gut für den Einsatz im Tief- und Straßenbau bei gering tragfähigen Böden.

Der für BEGRID TG Geogitter eingesetzte Rohstoff Polypropylen (PP) weist zudem eine hohe mikrobiologische und chemische Beständigkeit in natürlichen und belasteten Böden auf. Dank der robusten Materialstruktur bietet das Geogitter eine gute Witterungsbeständigkeit und eine hohe Widerstandsfähigkeit gegenüber Einbaubeschädigungen. Diese herausragenden Eigenschaften machen BEGRID TG Geogitter zu einem langlebigen und vielseitig einsetzbaren Bewehrungsprodukt.

Die knotenfesten und formstabilen BEGRID TG Geogitter sind mit unterschiedlich dimensionierten Gitteröffnungen und Zugfestigkeiten von 15 bis 40 kN/m verfügbar. Auf der Baustelle lassen sie sich leicht verlegen und ermöglichen dem Planer einfache und kostengünstige Baulösungen.

BEGRID TGV

Geogrids with additional non-woven filter fabric

When geogrids are used as reinforcement on fine grained 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.

Speziell für diesen Anwendungsfall wurde der Verbundstoff BEGRID TGV entwickelt. BEGRID TGV besteht aus den bewährten Geogittern der BEGRID TG-Reihe, welche werkseitig mit einem zusätzlichen Filtervliesstoff ausgerüstet sind.

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.

Die bewehrenden Eigenschaften des BEGRID TG Geogitters werden durch den Filtervliesstoff nicht beeinträchtigt. Vielmehr addieren sich die Vorteile der beiden Produktbestandteile.

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.

Deshalb ist BEGRID TGV bei schlammigen Untergründen oder in Moorgebieten die passende Lösung für Baustraßen und Tragschichtbewehrungen im Straßen- und Verkehrswegebau oder für den Bau von Rohrauflagern auf gering tragfähigem Untergrund.

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 3. Bodenbewehrung

Base course material
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity

Separation

trennen 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

filtern 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

Für die Auswahl eines Geogitters ist es besonders wichtig, dass eine Verzahnung mit dem Tragschichtmaterial gewährleistet ist und das Material nicht nur auf dem Geogitter aufliegt. Böden, die zu fein oder zu grob sind, eignen sich daher nicht. Die Öffnungsweite der BEGRID TG Geogitter wurde so dimensioniert, dass sich die Körnung der verwendeten Tragschichtmaterialien in den Gitteröffnungen optimal verzahnt und lagestabil gehalten wird.

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.

Für die BEGRID TG S-Produkte, mit einer quadratischen Maschenweite von 40/40 mm, sind besonders die Frostschutz- und Tragschichtmaterialien nach ZTV SoB-StB 04 0/22, 0/32, 0/45, 0/56 mm geeignet. Für die BEGRID TG L-Produkte, mit einer Maschenweite von 66/66 mm, sollte das Größtkorn nicht kleiner als 32 mm und nicht größer als 150 mm sein.

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, knot stiff geogrids with similar force-elongation behaviour is primarily determined by the rigidity of the knots and the mass per unit area of the geogrid. This test makes it possible to determine the axial 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.

Auch in technisch anspruchsvollen Anwendungsgebieten, wie der Bewehrung von Steilböschungen und Stützkonstruktionen, der Überbauung von Schlammteichen, in Lastübertragungsmatratzen und als Sicherungslage in Erdfallgebieten, stellen BEGRID TG Geogitter sichere und wirtschaftlichere Lösungen gegenüber herkömmlichen Bauweisen dar.

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

Reinforcing layer under a dam

Bound upper construction layers
Unbound upper construction layers
Base layer
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity

Several reinforcing layers

Bound upper construction layers
Unbound upper construction layers
Base layer
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity

Overlaying slurry ponds and organic soils

Bound upper construction layers
Unbound upper construction layers
Base layer
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity

Reinforced layer as soil replacement

Bound upper construction layers
Unbound upper construction layers
Partial soil replacement
BEGRID TG Geogrid
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)

Unbound upper construction layers
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity

Reinforcement layer to even out settlement

Bound upper construction layers
Unbound upper construction layers
Base layer
BEGRID TG Geogrid
Subsoil with poor load-bearing capacity
Good load-bearing substrate or substructure

Reinforced foundation bed as a bearing layer for pipelines

Pipe bedding
BEGRID TG Geogrid
Unbound sub-base
Subsoil with poor load-bearing capacity

Data

Properties	TG 20 20 S	TG 30 30 S	TG 40 40 S	TGV 20 20 S	TGV 30 30 S
Product type	extruded Geogrid
Raw material	Polypropylene (PP)
Non-woven fabric	without			GRK 3 – 170 g/m2
Maximum tensile strength longitudinal / transverse (kN/m) Standard: EN ISO 10319	20	30	40	20	30
Mass per unit area (g/m2) Standard: EN ISO 9864	250	350	535	420	530
Junction Strength (kN/m) Standard: GRI GG2	18	27	38	18	27
Secant stiffness (kN/m) at 0,5 % Elongation	759	989	1.499	759	989
Main fields of application
Earthworks and foundations	●	●	●	●	●
Road and traffic area	●	●	●	●	●
Further applications
Road construction	●	●	●	●	●
Mud ponds and organic soils	○	●	●	○	●
Canal structures	○	○	○	●	●
Settlement equalisation		○	●		○

● suitable | ○ partly suitable (project-related assessment necessary)

Special types available on request.

Request further product information

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 einer umfangreichen Studie der EAGM offenbarte die Lebenszyklusanalyse von Bauweisen mit Geokunststoffen die ökologischen und ökonomischen Vorteile von Geokunststoffen im Vergleich zu konventionellen Bauweisen. Insbesondere bei Geogittern verdeutlicht sich das enorme Einsparpotenzial. So kann durch den Einsatz von Geogittern ein konventioneller Bodenaustausch größtenteils oder vollständig vermieden werden.

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

%

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

With BEGRID TG Geogittern ergeben sich Einsparungen von Kosten für mindestens 40 cm Aushub und Entsorgung sowie Lieferung und Einbau von Ersatzmaterial.

Improvement in load-bearing capacity due to BEGRID TG Geogrids

Example, based on a modulus of deformation EU = 10 MPa_V2 Example, based on a modulus of deformation EU = 10 MPa

Installation

BEGRID TG Geogrids must always be laid without any wrinkles or folds. BEGRID TG möglichst faltenfrei zu erfolgen.
Das BEGRID TG Geogitter wird nach dem Verlegen mit geeignetem Schüttmaterial überdeckt:

BEGRID TG S: 0/22–0/56 mm
BEGRID TG L: 0/63–0/150 mm

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_V2-Wert unter 5 MPa) ist die Schicht auf mindestens 30 cm zu verstärken.
Bei der Verlegung auf Böden mit einem E_V2-Wert von 15 MPa ist eine Überlappung von mindestens 30 cm vorzusehen, bei Werten zwischen 5 und 15 MPa mindestens 50 cm und bei Werten unter 5 MPa ist mit uns Rücksprache zu halten.
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.
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.