Construction technology, process and installation of Geogrid
Author: Hengke Shandong HuaSu Engineering Co., Ltd Time: September 27, 2020 08:10 Visits: second
Description: it is suggested that after the geogrid is paved, the upper layer of filler shall be laid manually, and the rolling shall be completed in time to avoid long-term exposure to the sun. Then, the material shall be transported, leveled and rolled mechanically. The mechanical paving and rolling shall be carried out from both sides to the middle, and the compaction degree shall meet the specification requirements.
Geogrid Detection and cleaning of the lower bearing layer → manual laying of geogrid → lapping, binding and fixing → paving upper subgrade soil → rolling → testing. The geogrid is laid on the flat lower bearing layer according to the width required by the design, and the upper and lower fillers are free from impurities damaging the geogrid. When laying the geogrid, the direction with high strength shall be vertical to the embankment axis direction, and the geogrid shall be laid horizontally The geogrid shall be laid tightly and stretched to avoid wrinkles, distortions or potholes. The longitudinal splicing of geogrids shall be conducted by lap joint method, and the lap width shall not be less than 20cm.
It is suggested that after the geogrid is paved, the upper layer of filler shall be laid manually, and the rolling shall be completed in time to avoid long-term exposure to the sun. Then, the material shall be transported, leveled and rolled mechanically. The mechanical paving and rolling shall be carried out from both sides to the middle, and the compaction degree shall be maintained to meet the specification requirements.
All construction vehicles and construction machinery shall not be allowed to drive or park on the paved geogrid. The quality of the geogrid shall be checked at any time during construction. In case of damage such as breakage, puncture and tear, repair or replace it according to the extent.
Traditional slope protection materials can be divided into two categories: one is granular slope protection, represented by dry masonry, which has strong ability to adapt to bank slope deformation, easy to obtain materials, simple construction and convenient maintenance, but the construction quality is difficult to control; the second is integral slope protection, represented by bag concrete, with good integrity, strong ability to resist wind and waves, high degree of mechanized construction, but inconvenient maintenance after damage. These two kinds of slope protection have obvious advantages and disadvantages, but they have no environmental protection effect. It is difficult to repair the vegetation damaged by dry masonry and rock blasting. However, the direct use of cement with high industrial energy consumption and high exhaust emission is obviously not an environmental friendly slope protection material. More importantly, rigid revetment can not be applied to low-level deformation.
Geogrid is a special geotechnical material, mainly used in highway, railway and other subgrade treatment, and gradually introduced into water conservancy projects in recent years. The stone mat revetment made of geogrid has both integrity and flexibility. It has strong adaptability to slope deformation, high flexibility, and is not easy to break. It can withstand a large range of deformation without collapse. The surface of the stone mat after cage loading is rough, which is conducive to sediment deposition and plant growth, and has good environmental protection effect. The ability to resist chemical erosion in river engineering environment is very strong: when the carbon black content is 2%, It has good destructive capacity and high tensile strength. It can resist the scour of strong current underwater; it has strong ability to resist the impact of natural damage and bad weather; it can prevent the damage caused by hydrostatic pressure; it is convenient for construction and does not need special technology; it can save transportation cost. It can be transported in rolls and cut on the construction site.