Geogrid construction points

2019-08-02

Geogrid construction points


Construction site: It is required to be compacted and leveled, and the spiked protrusions are removed.


Geogrid laying: On the flat and compacted site, the main force direction (longitudinal direction) of the installed grid should be perpendicular to the axis of the embankment. The laying should be smooth, without wrinkles, and tension as much as possible. With the nail and earth and stone pressure fixed, the main force of the laid geogrid is preferably long and no joint, and the connection between the web and the web can be manually tied and lapped, and the overlap width is not less than 10cm. If the geogrid is set to be more than two layers, the layers should be staggered. After laying a large area, the overall straightness should be adjusted. After filling a layer of soil, before the crushing, the geogrid should be tightened again with manual or machine tools, and the strength should be even, so that the geogrid is in a state of tension and force in the soil.


Filler selection: Fillers should be selected according to design requirements. Practice has proved that in addition to frozen soil, marsh soil, domestic garbage, chalk soil, diatomaceous earth can be used as filler. However, the mechanical properties of gravel soil and sand soil are stable and have little influence on water content, which should be preferred. The particle size of the filler should not exceed 15cm, and the filler gradation should be controlled to ensure the compaction weight.


Paving and compaction of the packing: When the grid is laid and positioned, it should be filled in time, and the bare time should not exceed 48 hours. It can also be used as a running method for backfilling while laying. First spread the packing at both ends, fix the grille, and then push it toward the center. The order of rolling is first and then the middle and the back. When the roller is pressed, the pressure roller cannot directly contact the ribs. The uncompacted reinforced body generally does not allow the vehicle to travel on it to avoid the geogrid being misaligned. The partial lamination is 20-30 cm. The degree of compaction must meet the design requirements, which is also the key to the success of reinforced soil engineering.


Waterproof and drainage measures: In the reinforced soil project, it is necessary to do the drainage treatment inside and outside the wall; to protect the feet and prevent erosion; to set up filtration and drainage measures in the soil, if necessary, geotextiles should be installed and permeable Tube (or blind ditch). Drainage by means of dredging, can not be blocked, otherwise it will cause hidden dangers.


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