Geogrid is a complex technology that prevents displacement, subsidence, cracking of the construction, wash-out and erosion and permits struggle successfully against the phenomenon of frost swelling that is inevitable in dust soils, which provides drainage of excess water. The use of geogrids can significantly reduce the thickness of embankment by its reinforcement, as well as use actively cheap local building materials and even waste and soil.
The geogrids are used for erosion protection of slopes, protection of the cones of overpasses, construction of retaining walls, reinforcement of weak bases. Cell walls have an embossed surface that increases friction with the filling material and perforations for improving the drainage characteristics of the structure. The Geogrid is supplied in modules 14.5 m 2 (in working position). The Geogrid allows providing works in the temperature range from -40 ° C to + 60 ° C, it is neutral to aggressive environments and environmentally safe.
The geogrids are suitable for the construction of retaining walls of different heights and with any angle of base of slope. The Geogrid modules could be easily placed on top of each other. The cells are filled with gravel or sand with a layerwise sealing.
The Geogrid is used for reinforcement of the base of roads, construction of road pavements, as a support layer for sites for different purposes and foundations located on soft ground; for the protection of pipe systems, piers and beaches from erosion; for erosion protection of cones bridges and output pipes, retention of fertile soil on steep slopes; for the construction of "green" retaining walls. Along with an increase of the strength properties of earth constructions and drainage, use of geogrids allows to get as a result natural smooth and aesthetically flawless lines in the landscape planning.
The construction of slope protection is a solid carpet of geogrid modules whose cells are filled with rubble on the cones of overpasses or vegetal soil, followed by sowing seeds of perennial grasses on slopes or embankments.
Geogrid is effective in the construction of roads on weak grounds. The Geogrid, filled with soil, as a flexible plate distributes the load from the embankment to a weak foundation and provides a uniform settling of the entire structure.
The geogrids are widely used in civil construction all over the world. They are produced of high-strengthen polyethylene and polypropylene. It is the mechanism of coupling of granular material with the cells of the grid. This jam allows to the grid to resist horizontal shear of the embankment, thereby mobilizing the bearing capacity of soft ground. The geogrids are used as a reinforcing material on loose inhomogeneous soils for roads and railways, in the parking places on the landing grounds, as well as for the reinforcement of bridge piers, slopes and soil dams. The Geogrid is widely used for soil reinforcement in transport, hydraulic and other fields of engineering of modern construction.
Due to the large carrying capacity and relatively low possibility of deformation, the geogrid can be used for:
- fixing various kinds of road surface
- slope protection and fixation of heightened gradient slopes
- protection of coastal zones of reservoires and riverbeds of small streams
- fixing the slopes of cones railways
- construction of retaining walls
As a result of using of geogrids the construction costs reduce considerably and solidity of structures increase.
The geogrid is a honeycomb structure that consists of polyethylene tapes of 1.5 mm, fastened together with a help of welded high-strength sutures in staggered order. When stretched in the working are it forms a stable vertical and horizontal frame which is designed for fixing the filler (ground, quartz sand, concrete, etc.).
The material that is the geogrid is made of is neutral to aggressive environments, non-toxic, resistant to UV, oil, alkali-proof, resistant to soil environment as well as to fresh and salt water, that helps to retain its characteristics over years of use.
It is transported in a folded state, and occupies a small volume.
Installation of geogrid
The fixing of geogrids on the surface of slopes is made with a help of L-shaped anchors 12-16 mm and a length 0,6-1,2m made of steel or high-strength plastic materials. The anchors are set along the edge of each geogrid for providing its correct stretching in a form of rectangle.
The dividing and draining layer of non-woven geotextile with a density 200-400 g / m is placed between the geogrid and the surface of soil slope (in the case of filling the frame with gravel) Soil, gravel and concrete with a frost resistance not less than the M200 could be used for filling the cells of the geogrid.
|Technical specifications of geogrids|
|Dimensions of a module:||
width from 2.45 m to 2.60 m
length from 5.75 m to 12.45 m
height from 0.05 m to 0.2 m
|Area in an extended state:||14.58 m2|
|Nominal tape thickness||1.5 mm (+/- 0.1 mm)|
|Diagonal of the cell, m||2 m; 0.3 m; 0.4 m; 0.6 m|
|Weight of module, kg||from 6 kg to 32 kg|
|Breaking load of a tape||not less than 40kN / rm. m|
|Elongation at break, %||50|
|Breaking load of weld||at least 50% of the strength of a tape|
|Installation temperature:||From -40 to +60 ° C|
The geogrid for strengthening of slopes
The geogrids are used for providing general and local stability. For providing the overall stability of slope, geogrids are used in the body of the slope as reinforcing layers. For guarantee of a local stability of slopes with a help of geogrids, different fillers are used: vegetal soil with grass seed, crushed stone or gravel, monolithic concrete.
The main advantage of the use of geogrid technology is the possibility of strengthening the filler material of the slopes of such gradient, where this material cannot retain by itself on the slope.
The geogrids are used for strengthening the surface of cones of bridges and viaducts, as well as for strengthening of pipelines.
In recent years, the ground laying gas pipeline the most widely used. It permits to avoid the limitations that appear during the underground laying of gas pipelines.
However, this method of building has one disadvantage that is the erosive destruction of the embankment slope of the pipeline resulting from the influence of water and wind.
For the protection of the pipeline have been developed the following structures:
- protecting slopes with using geotextile with seeds of perennial grasses;
- planting of trees and shrubs on the outputs of the pipeline;
- strengthening of the pipeline embankment of the gas pipeline with a help of ground filled geotextile containers with cover of peat-sand mixture.
The application of this type of construction on difficult areas of aerial crossing and the linear part of banking gas pipeline has improved the technical and operational indicators. The term of exploitation without repairing the dike of pipeline is significantly prolonged. Apart from the improving of exploitation properties of the pipeline, the technology of application of the geogrids allows to stabilize the mound of embankment.