One-way stretched plastic geogrid is a high-strength geosynthetic material. It is a geotextile made of high-density polyethylene (HDPE) as the raw material, extruded into a thin plate, punched into a regular hole mesh, and then stretched longitudinally. Gate is widely used in dams, tunnels, docks, roads, railways, construction and other fields.

characteristic

1. The polymers form a oriented linear state and form an oblong mesh-shaped integral structure with uniform distribution and high node strength. This structure has a very high tensile strength and rigidity, providing the soil with an ideal chain system for bearing force and diffusion.
2. The outstanding advantage of one-way plastic geogrid is that it has a small tendency to deform (deformation) under long-term continuous loading, and its creep resistance is much better than that of geogrids of other materials, which plays an important role in improving the service life of the project. .
3. The occlusion and interlocking effect between the grid mesh and the soil form an efficient stress transmission mechanism, so that local loads can quickly and effectively spread to large areas of soil, thereby reducing local damage stress. , the purpose of improving the service life of the project.

Engineering Applications

One-way lajunction plastic geogrid is a high-strength geosynthetic material. Its main uses are as follows:

1. Strengthen the roadbed, which can effectively allocate diffusion load, improve the stability and bearing capacity of the roadbed, and extend the service life;
2. Can withstand greater alternating loads;
3. Prevent the deformation and cracking of the roadbed material caused by the loss of roadbed materials;
4. Improve the self-supporting capacity of soil filling behind the retaining wall, reduce the soil pressure of the retaining wall, save costs, extend service life, and reduce maintenance costs;
5. Combined with the spray anchor concrete construction method for slope maintenance, it can not only save 30%-50% of investment, but also shorten the construction period by more than twice;
6. Adding geogrids to the roadbed and surface layers of the highway can reduce bends, reduce ruts, delay the occurrence time of cracks by 3-9 times, and reduce the thickness of the structural layer by 36%;
7. Suitable for all kinds of soils, no need for materials from other places, saving labor and time;
8. The construction is simple and fast, which can greatly reduce construction costs.

Construction method

1. When used in roadbeds or road surfaces, excavate the foundation bed, set up a sand cushion layer (the height difference is not greater than 10em), roll it into a platform, and lay the grille. The longitudinal axis should be consistent with the main force direction, and the longitudinal overlap is 15-20cm, 10cm horizontally, the overlapping area is tied with plastic tape, and fixed to the ground with U-shaped nails every 1.5-2m. The laid soil grille should be backfilled in time. The number of floors on the upper L grid is determined by the technical requirements.

2. When used for reinforced earth retaining walls, the construction is distributed as follows:

1. Set up the foundation and carry out construction according to the designed wall system. When prefabricated reinforced concrete panels are selected, they are generally 12-15cm thick and supported on the prefabricated concrete foundation. Its width is not more than 30cm, thickness is not less than 20cm, and buried depth is not less than 60cm to prevent the influence of foundation frost swelling;
2. Flat the wall foundation, excavate and level according to design requirements. The soft soil needs to be compacted or replaced, and compacted to the required density and should slightly exceed the wall range;
3. When laying the rib material, the main strength direction of the rib material should be perpendicular to the wall and fixed with pins;
4. The wall is filled with mechanical filling. The distance between the wheel and the ribs should be maintained at least 15cm. The thickness of the soil after compaction is about 15-20cm. During the wall construction, the wall should be covered with ten-work fabrics. Prevent soil fill leakage.