Polypropylene Unidirectional Geogrid

Product Description
A high-strength reinforced geosynthetic material made by unidirectional拉伸of polypropylene through plastic extrusion, sheet punching, and longitudinal stretching, featuring exceptional tensile strength and elastic modulus.

Technical Advantages
The company is always committed to enhancing product performance and developing new products, especially high-strength geogrids. Currently, we have increased the tensile strength of unidirectional geogrids to 320 kN/m.
High-strength geogrid meets higher design requirements, ensuring greater stability and safety for projects. It significantly enhances load-bearing capacity, extends service life, reduces land occupation, facilitates construction, shortens project duration, lowers construction costs, and minimizes maintenance expenses.

Application Fields
Primarily used in the construction of reinforced soil retaining walls, embankments, bridge decks, and steep slopes for roads, railways, ports, and along river, lake, and coastal shores. Also suitable for reinforcement of soft soil foundation projects. Widely applied in reclamation projects. 

Unidirectional geogrid is formed by extruding high molecular polymer (PP or HDPE) into a thin plate, punching it into a regular grid pattern, and then stretching it longitudinally. This process aligns the high molecular polymer into a directional linear state, forming a uniform, long elliptical mesh structure with high node strength. Unidirectional stretched geogrid is a high-strength geosynthetic material.
A unidirectional拉伸geotextile grillage is a high-strength geosynthetic material primarily made from high molecular polymer, enhanced with certain UV-resistant and anti-aging additives. Through unidirectional stretching, the originally disordered chain-like molecules are re-oriented into a linear arrangement. After being extruded into thin plates and punched into a regular mesh, it is further stretched longitudinally. This process results in a uniform, long-oval network structure with high node strength, where the high molecular polymer achieves a directional linear state.
This structure boasts a high tensile strength and modulus, with tensile strength reaching 100-200 MPa, nearly matching that of low-carbon steel, significantly surpassing traditional or existing reinforced materials, with elongation rates of 2% to 5%. It provides an ideal force-bearing and diffusing连锁 system for soil. The product has a high tensile strength (>150 MPa), is adaptable to various soils, and is widely used as a reinforcement material. Its main features include high tensile strength, good creep resistance, ease of installation, and low cost.

Primary Uses

1. Single-direction geogrid for reinforcing soft subsoil: The geogrid can rapidly enhance the bearing capacity of the subsoil, control the settlement, and effectively distribute the load over a wider subgrade, thereby reducing the thickness of the subgrade, lowering construction costs, shortening the project timeline, and extending the service life.

2. Single-Direction Geogrid for Reinforcing Asphalt or Concrete Pavements: The geogrid is laid at the bottom of the asphalt or concrete layer, which can reduce rut depth, extend the pavement's fatigue life, and also reduce the thickness of the asphalt or concrete paving to save costs.

3. Single-axial geogrid is used for reinforcing embankment slopes and retaining walls: Traditional embankment construction, especially for high embankments, often requires overfilling and the shoulder edges are difficult to compact, leading to the phenomenon of later slope erosion and instability due to rainwater, with collapses occurring occasionally. Additionally, the need for gentler slopes requires more land area, and retaining walls face similar issues. Reinforcing embankment slopes or retaining walls with geogrid can reduce land area by half, extend service life, and lower costs by 20-50%.

4. Unidirectional geogrid for reinforcing river, lake, and sea embankments: Can be made into gabions, combined with the geogrid to prevent erosion and collapse of embankments caused by seawater. Gabions are permeable, which can mitigate the impact of waves and prolong the service life of embankments, saving labor and materials, and shortening the construction period.

5. Unidirectional Geogrid for Waste Landfill Management: The combination of geogrid with other soil composite materials in the treatment of waste landfills effectively addresses uneven foundation settlement and emitted gases, while significantly enhancing the storage capacity of the landfill.

6. Special Application of Single-Way Geogrid: Low-Temperature Resistance. After 200 cycles of repeated cold and hot temperatures ranging from -45℃ to -50℃, all performance indicators meet the requirements and have passed the test of the Qinghai-Tibet Railway. Suitable for northern areas with low-frozen soil, rich-frozen soil, and high-ice-content frozen soil.

Construction Method

When used for subgrade and pavement, the construction method is the same as that for bidirectional geogrid.

When used for reinforced soil retaining walls, the construction method is as follows:

1. Establish the foundation, and construct according to the designed wall system. When using precast reinforced concrete panels, they are typically 12-15 cm thick and supported on precast concrete foundations. The width should not exceed 30 cm, the thickness not less than 20 cm, and the burial depth not less than 60 cm to prevent ground frost heave.

2. Level the foundation wall, excavate and level according to design specifications. Soft soil must be compacted or replaced, compacted to the required density, slightly exceeding the wall face.

3. Reinforcement laying: The main strength direction of the reinforcement should be perpendicular to the wall and secured with rivets.

4. Wall backfilling should use mechanical backfilling, ensuring a minimum distance of 15 cm between the wheel and reinforcement materials. After compaction, the thickness of the soil layer should be approximately 20-15 cm.

5. During wall construction, the wall area should be wrapped with geotextile to prevent soil erosion.