What are the functions of geogrids in roadbed laying?

　　There are many functions of geogrids, and those who have some understanding of geogrids are well aware of what we use geogrids for. However, despite this, there are still many people who want to further understand geogrids and have a deeper understanding of them. In order to meet everyone's requirements, let's take a look together!

　　What is a geogrid? What is its purpose? Perhaps many friends may have doubts. Geogrid board is a polymer mesh material formed by stretching, with square and rectangular shapes. According to its stretching direction, it can be divided into two types: unidirectional stretching and bidirectional stretching. Reinforce and reinforce soft soil foundations such as roads, railways, embankments, abutments, approaches, wharves, revetments, flood control dikes, dams, mudflat treatment, freight yards, slag yards, airports, sports grounds, environmental protection buildings, increase shear and tensile strength, and resist cracks in retaining walls, slope protection and pavement.

　　1) Increase the bearing capacity of the roadbed and extend its service life.

　　2) Prevent road surface collapse or cracks, and maintain a beautiful and tidy ground.

　　3) It can effectively block the transmission of seismic forces and plays an important role in enhancing the seismic stiffness, strength, and stability of embankments.

　　4) Reduce the thickness of the cushion layer and save costs.

　　Convenient construction, time-saving, labor-saving, shortened construction period, and reduced maintenance costs.

　　Evaluation criteria for geogrids:

　　The particle size of the filler on the upper and lower sides of the geogrid, as well as within 8 centimeters of the grid layer, shall not exceed 6 centimeters.

　　Leveling the site - lay a 50cm thick sandstone gravel or sand (gravel) gravel cushion layer on the surface and compact it.

　　Filling - After laying the grid, the filling material should be filled within 48 hours. Each layer of filling should be carried out symmetrically according to the principle of "first on both sides, then in the middle", and it is strictly prohibited to fill the middle of the embankment first. The filling material is not allowed to be directly unloaded on the geogrid, but must be unloaded on the already paved soil surface, and the unloading height should not exceed 1m.

　　According to the designed position, lay the grid along the roadbed direction. When laying the grid, attention should be paid to the connection and straightness between the grids. The longitudinal and transverse joints of the geogrids can be connected by nylon rope or polyester thread or U-shaped nails to form a whole. The overlapping width between the geogrids should not be less than 20cm. When laying, the geogrids should be straightened by hand to make them smooth and even. The laid geogrids should be fixed to the ground with hook nails every 1.5-2.0m.