Steel plastic geogrid is a geosynthetic material composed of a steel plastic composite reinforcement strip (with high-strength carbon spring steel wire as the load-bearing material and polyethylene resin as the protective material), arranged at right angles to the plane longitude and latitude, and formed by ultrasonic welding. It is a comprehensive product of existing rigid reinforcement materials (flat steel strips, ribbed steel strips, galvanized steel strips, stainless steel strips, reinforced concrete strips, etc.) and flexible reinforcement materials (polypropylene strips, plastic geogrids, warp knitted grids, etc.). Due to its high tensile strength, low elongation (≤ 3%), low creep, and strong interlocking and interlocking effects on soil, it can effectively treat soft soil foundations, constrain lateral displacement of soil, overcome uneven settlement of soil, greatly enhance the bearing capacity of the foundation, and improve the overall performance of the foundation; It can be widely applied to the reinforcement and strengthening of road engineering, railway engineering, retaining structures and dam engineering, water conservancy engineering, tunnel engineering; It has significant protective effects and good socio-economic benefits in combating ruts and preventing road cracking.

1. Strength of bidirectional steel plastic geogrid

The tension of the bidirectional steel plastic geogrid is borne by high-strength steel wires woven in warp and weft directions, which can produce extremely high tensile modulus under low strain. The longitudinal and transverse ribs work together, fully exerting the interlocking effect of the grid on the soil. Multiple types of grids can be designed according to engineering needs, using different steel wire diameters or numbers, different rib widths, and different mesh sizes to meet the needs of different engineering applications.

2. Deformation and elongation at break

The steel wires of the longitudinal and transverse ribs of the bidirectional steel plastic geogrid are woven into a mesh, and the outer wrapping layer is formed in one go. The steel wires can coordinate with the outer wrapping layer, and the elongation at break is very low (not greater than 3%). The main load-bearing unit of plastic steel geogrid is steel wire, with extremely low creep deformation.

3. Friction coefficient

By processing the plastic surface during the production process, rough patterns are pressed to enhance the roughness of the grid surface and improve the friction coefficient between the bi-directional steel plastic geogrid and the soil.

4. Width

The width of the bidirectional steel plastic geogrid can reach 6m to achieve efficient and economical reinforcement effect.

5. Aging and durability

The high-density polyethylene of the bidirectional steel plastic geogrid ensures that it will not be corroded by acid, alkali, salt solutions, or oils at room temperature; Will not be affected by water dissolution or microbial invasion. Meanwhile, the high molecular weight properties of polyethylene are also sufficient to resist aging caused by ultraviolet radiation. After the grid is subjected to force, the longitudinal and transverse ribs work together without causing tearing or damage to the nodes. In practical engineering, after the compaction of the filling material, it can fully meet the requirements of permanent engineering construction because it is not corroded by ultraviolet light and oxygen.

Performance indicators:

Transportation Industry Standard of the People's Republic of China JT/T480-2002 Geosynthetic Materials for Transportation Engineering Geogrids

Steel plastic composite tension bands are widely used in:

Roadbeds, embankments, cuttings, bridge piers, approach roads, ramps, landslide remediation, and protection of tunnel entrances on highways

Railway subgrade, embankment, bridge abutment, landslide remediation, protection of tunnel entrances, port terminals, breakwaters, revetments, diversion embankments, flood control embankments, dams, and water gates

Industrial tailings dam, slag yard, material yard, freight yard

Supporting projects for industrial and civil construction, embankments, walls, and various supporting structures

Surrounding mudflat of rivers and beaches

Forest area engineering and protection engineering

Performance characteristics of steel plastic composite reinforcement strip:

High tensile strength: The main load-bearing element of the steel plastic composite tension strip is the high-strength zinc coated steel wire inside the strip. The diameter and number of steel wires can be adjusted according to the actual needs of the project to change the tensile strength of the strip and produce tension strips with different tensile strength requirements.

Small deformation: The high-strength steel wire inside the steel plastic composite tension band ensures that the elongation at break of the band is ≤ 3%.

Long service life: The protective layer of the steel plastic composite lacing band is made of high molecular polyethylene material and mixed with a certain proportion of anti-aging agent, antioxidant, light shielding agent and other masterbatches to be extruded at high temperature, which ensures the holding force of the protective layer and the steel wire, so that the protective layer and the steel wire can bear the force together. The hot extrusion in the production process reduces the gap between molecules, and ensures that the steel wire in the band is not corroded. The polyethylene protective layer after anti-aging treatment has the chemical characteristics of resistance to acid, alkali and salt corrosion and is able to resist the aging caused by ultraviolet radiation.

Cost saving: After comparing several engineering examples, it has been found that the Changgu brand steel plastic composite reinforcement strip can save 10-50% of engineering costs compared to rigid and flexible reinforcement strips. Convenient construction: Steel plastic composite reinforcement strips do not require processing before use, are easy to cut, and do not require welding like rigid reinforcement strips during construction. They are corrosion-resistant, easy to lay, and avoid overlapping and crossing, effectively shortening the construction period.

Good pull-out performance: The surface of the steel plastic composite reinforcement strip has rough patterns and ribs formed by hot extrusion, effectively improving the friction coefficient of the strip and fully meeting the pull-out resistance of tall retaining walls