World-class knitted and polymer coated polyester geogrids engineered for demanding soil reinforcement applications and manufactured using state-of-the-art technology.

TECHGRID geogrids are knitted and protective polymer coated polyester geogrids manufactured at our state-of-the-art facility at Silvassa, Dadra & Nagar Haveli. Making use of the latest advances in the fields of polymer science, textile technology and geotechnical engineering, Techfab India presents to our customers a world-class product, engineered for demanding soil reinforcement applications.

Superior grades of high tenacity, high molecular weight and low carboxyl end group polyester yarns are formed into a grid structure using an advanced weft-insertion and warp-knitting process and is then given a high quality polymeric coating to produce a strong, flexible, tough, uniform aperture, dimensionally stable and durable geogrid. The product is ideal for the reinforcement of soils and other granular materials for a variety of applications.

For examples TechGrids are effectively used in:

• Railroad construction
• Railway construction
• Hydraulic structures
• Reinforced earth structures
• Landfill construction
• Pipelines constructions

TechGrid are normally supplied in width of 2.5m and 5.0m provide efficient and cost effective coverage. The roll length is 50m and 100m to minimize the overlapping. Special sizes can also be supplied as per customer’s requirement.

TechGrid TGU series of uniaxial geogrids are available in a wide range of tensile strengths and are suitable for applications which require strength in one direction

• Reinforced soil walls
• Steep slopes
• Basal reinforcement of embankments
• Veneer reinforcement in Landfill
  

TGU Product Photo

TechGrid TGB series of biaxial geogrids resist increased passive bearing resistance and exhibits high tensile strength in both longitudinal and transverse directions. It is designed for maximum bearing capacity and shear resistance. Thus TGB series are suitable for applications where, strength in both directions is important

• Reinforcement of granular Road/Rail/Airport sub grade, sub base and base
• Soil stabilization
• Load transfer platforms

TGB Product Photo

The TechGrid Range

• TechGrid Uniaxial Geogrids (download in pdf format)
• TechGrid Biaxial Geogrids (download in pdf format)
  

• Consistent and assured product quality
• Both chemically and biologically inert
• Flexible and Tough: Delivers immediately soil geogrid stress transfer ensuring minimal movement of soil structure
• Excellent performance
• High Tensile strength at low elongation
• Excellent long term behavior due to low creep tendency
• High resistance to Chemical for the range of pH normally encountered reinforced soil mass, Biological, Hydrolysis, UV radiation, Installation damage
• Increase pullout resistance
• Easy, safe and fast installation, since it is flexible and light weight
• Roll width 2.5 m and 5 m. reducing the placement time and thus lowering cost
• Roll length 50 m and 100 m to minimize overlapping
• Custom Fabrication of rolls: fabricated to the specific requirement of the projects
  

• Reinforced soil structures: Retaining wall; Steep slope, Noise barriers, Bridge abutments, Sea walls
• Basal reinforcement of embankment over weak subgrade
• Reinforcement of subgrade and granular base, sub base in road and railway, airport runway constructions
• Landfill: Reinforcement of top cover, side slope and foundation over soft soil
• Earth Embankment over piles
• Load transfer platforms
• Area stabilization
• Foundation over cavities: Bridging of underground voids and sinkholes
• Hydraulic Structures: Reinforcement at side slope of lining system in Canal and Reservoir

Soil reinforcement today is a cost effective method developed over 30 years to improve the load bearing capacity of weak soil, to provide stability and control deformation of steepen slope and segmental retaining wall.

In reinforced soil retaining wall and steep slopes, TechGrid geogrid (TGU) is used for making composite mass of soil and geogrid. TGU provided as a uniaxial extensible horizontal reinforcing element that extends in to the backfill and it act like “tieback” to resist the outward movement of retained soil by reducing the outward pressure. The facing and reinforced fill behaves as a composite gravity structures resisting earth-pressures and surcharge loads by its own weight.

TGU as a tensile element (Reinforcing element) improves the shear strength of soil much greater than a similar unreinforced soil mass and absorbs the axial tensile load in soil. Consequently (TGU) provides stability and control the both axial and lateral deformation of temporary and permanent retaining walls and steep slopes. Effective soil reinforcement must intersect all potential failure planes within the soil mass.

TechGrid is combined with different type of facings like:

Modular/Segmental concrete blocks

Discrete concrete panels

Wrap around

Bag work and Gabion

Retaining walls constructed in this manner are economical, efficient, land saving and aesthetic.

Modular block, or Segmental, retaining walls employ interlocking concrete units that tieback into the earth to efficiently resist loads and earth-pressure. The blocks (segmental units) are attached to horizontal layers of geogrid reinforcement that extend into the reinforced soil zone to form a gravity mass.

These pre-engineered modular systems are an attractive, economical, and durable alternative to stone or poured concrete retaining walls. The inherent design flexibility can accommodate a wide variety of site constraints, project sizes, and aesthetic preferences. The reinforced earth retaining wall is advantageous for seismic areas since it can accommodate settlement without distress in the wall.

The components of a complete system can include foundation soil; leveling pad; precast concrete units of high-strength concrete; shear pins if units don't interlock; multiple-depth walls or additional soil reinforcement such as geotextile, welded wire fabric, or dead-man anchors if the wall is over a certain height; retained soil; and drainage fill. The soil reinforcement consists of horizontal layers that extend into the backfill.

Being gravity structures, these systems rely on their own weight and coherent mass to resist overturn and sliding forces. The segmental nature affords the wall a permeability to relieve hydrostatic pressure, so less material is required for resistance. Because they are considered flexible structures, the footings usually need not reach the frost line.

The reinforced retaining wall and slope with TechGrid (TGU), provided the following benefits in contrast of the other traditional rigid retaining wall and steep slope systems:

Steep slope

The engineer’s ability to increase usable property economically has become an important factor in all segments of property development. Increasingly, residential, commercial and industrial developers as well as transportation and infrastructure facilities designers are faced with the challenge of maximizing land use in areas that often have both difficult topographic characteristics as well as difficult soil conditions. Hence Advantage of steep reinforced slopes is in increasing the usable land by making the slope steeper.

TechGrid’s (TGU) high strength, flexibility, and high creep resistance make it perfect choice for a wide variety of slope reinforcement applications. TGU with their wide range of design strength from 40 kN/m to 200 kN/m greatly improves the shear strength of soil and provide tensile resistance to soil mass, thus enhance the stability of the natural soil slope. TGU enable designer to increase the slope angle, improve tensile strength of soil mass, increase the slope’s overall factor of safety and maximize the usable land area. The facing of the slope can be grass or another facing materials. Reinforced soil technique with Tech Grid enables slopes to be constructed to any height and at any slope angle.

Other advantage of reinforced slope with TechGrid Geogrid (TGU)

Basal reinforcement of embankment

TechGrid is invaluable in the construction of piled and soft soil embankments (e.g., road and rail embankments) where ground conditions are extremely poor. Embankments constructed using TechGrid can be built more quickly and offer a higher degree of safety and limit differential settlement. It may also be possible to increase the height of the embankment with TechGrid, if this is desirable.

Depending on the specific application, the product may be placed directly on the soft foundation, over foundation piles, or over areas subject to void formation prior to the placement of the embankment fill.

In an area of old mine workings, or eroded geology, TechGrid can safeguard against the catastrophic collapse of an embankment due to the formation of a void.

Advantage of Reinforced embankment on piles versus Conventional embankment foundations directly on soft soil

Reinforcement of subgrade and granular base, sub base

Real estate development is frequently a challenging business––even more so in areas containing poor subgrade soils.

Mechanical Stabilization of weak subgrade with Stiff Biaxial TechGrid (TGB) is typically used beneath roadways, rail yards, airport, construction platforms, and parking lots - all such structures that support vehicular traffic. It is well known that roadway and infrastructure performance is highly dependent on support provided by the subgrade. TGB for base reinforcement is typically placed in the interface between aggregate base course and the subgrade (or subbase) or within the base course layer. Lateral movement of the base course is prevented, and applied loads are distributed in a wider area.

The soils' lack of tensile strength under imposed dynamic loadings causes lateral shear failure of the base course materials, resulting in severe rutting and surface pavement failure. Therefore in base reinforcement, applications such as paved or unpaved roads, TGB are effectively used to provide reinforcement and confinement to base course materials. TGB reinforced the weak subgrade and provide the solid platform on which to construct the new road.

Typically the fill material used in base reinforcement is a quality granular material with specific structural characteristics. By incorporating TechGrid geogrids (TGB), the required thickness of the granular fill can be significantly reduced, and translating into significant cost savings.

TGB Biaxial (BX) Geogrid and aggregate fill interact to create a stiffer composite structure. The result is a stronger, yet not brittle, pavement that's more economical, better performing, more durable and predictable.

Subgrade stabilization with TGB is quick and reliable method and greatly cost effective than subgrade displacement, excavation and replacement of weak soil, and traditional lime/chemical stabilization of soft and/or expansive soils.

There are three potential reinforcement mechanisms:

The TGB increases the economics and performance of subgrade, sub base, and base thus provide following advantages:

Advantage of stabilization of soft subgrade with TGB geogrid over lime/chemical stabilization

TGB Geogrids are lightweight and supplied in roll form so they are easily handled and installed by one to two general laborers. Conversely, Lime and other chemical agents require specialized equipment, trained crews, and, in some areas, environmental monitoring and controls. If not sufficiently dispersed in the soil, lime stabilization will not work. Better quality control is necessary during the lime stabilization process. Moreover, geogrids may be installed in almost any weather and perform as intended immediately, with no curing period. Lime stabilization requires very specific moisture and temperature conditions to be effective. In fact, once applied, lime must be kept moist and cured for three to seven days. During this period, the ambient temperature must stay above 5° C otherwise the curing process may not be effective. Furthermore, stiff biaxial TGB geogrids are manufactured from durable polymer coated polyester. Thus, they are inert to almost any soil chemistry and will not significantly degrade or lose effectiveness over the design life. On the other hand, lime is very sensitive to soil chemistry and may actually leach from the soil matrix when subjected to wetting. Worse yet, lime has the potential to react adversely with soils containing sulfates or excessive organic material. If the sulfate content of the soil is too high, severe, non-reversible swelling can occur upon addition of lime. If the organic content is too high, the lime may not react enough to efficiently stabilize the soil.

Landfill

TECHGRID (TGU) maximizes Economy, Life Span and Environmental Security for Landfills. Extensive range of TechGrid is ideally suited to a variety of applications for landfill. For example

Post Engineered Landfill Importance and Uses:

Stability of side slope: The soil that is placed over a side slope of landfill lining system over geomembrane liner as a cover and/or drainage purposes may cause a sliding failure due to presence of weakest interface between components of the liner system and possibly result in the rupture of the liner in future.

TechGrid geogrids, as a reinforcing element can support the cover soil over the liner, reducing the strain placed on the underlying lining system and ensuring the long-term stability of the landfill.

In composite lining system on side slope the TechGrid is provided to bear the tensile stresses that is developed due to sliding between different layers of liner system because of presence of lower friction angle between components of liner system than slope angle.

A side slope Stability with TechGrid allows you to

Minimize the potential for sliding failures by improving the frictional interface between inclined geomembrane liner and the adjacent soil layer otherwise sliding can potentially lead to liner ruptures

Construction of steeper side slopes is possible so in turn maximize use of land is also possible

By employing TechGrid to your landfill you gain

Environmental security, by protection of ground water and surrounding environment from leachate, that is generated in landfill, since TechGrid effectively maintain the stability of the liner system

Additional capacity of landfill with steeper side slopes

VOIDS BRIDGING

TechGrid is used to support liner systems when these are constructed over areas that are susceptible to differential settlements. The TechGrid ensures the integrity of the liner system is maintained as the underlying layer undergoes deformation.

Design Support

Providing unconventional solution to various Geotechnical problems

Our highly capable and veteran engineers are always ready to support you with necessary inputs for an impartial design consultation on weak ground stabilization, steep slopes and retaining walls, erosion control applications. We provide a complete detail design and supply package for reinforced soil structures including working drawings and installation assistance.

By consulting our team of professionally qualified Geotechnical Engineers at the earliest stages of a project, Techfab can help you save time and money during the initial design phases.

We are proud to offer the following services: