Geogrid Installation Guideline

(1) First, release the side slope line of the subgrade accurately. In order to ensure the width of the subgrade, each side is widened by 0.5m. After leveling the air-dried base soil, statically press it twice with a 25T vibratory roller, and then four times with a 50T vibratory roller. , The uneven place is artificially leveled.

(2) Pave the medium (coarse) sand with a thickness of 0.3m. After manual leveling with mechanical leveling, the 25T vibratory roller will statically press twice.

(3) Lay geogrid. When the geogrid is laid, the bottom surface should be flat and dense. Generally, it should be laid flat, straightened, not overlapped, curled, or kinked. The connecting part is interspersed with No. 8 iron wire every 1 meter, and on the laid grid, it is fixed to the ground with U-shaped nails every 1.5-2m.

(4) After the first layer of geogrid is laid, start to fill the second layer of 0.2m thick medium (coarse) sand. The method: transport the sand to the construction site by car and unload it on the side of the roadbed, and then push it forward with a bulldozer First, fill 0.1m within 2m on both sides of the subgrade, then turn over the first layer of geogrid and fill it with 0.1m of medium (coarse) sand. This kind of machine works on the geogrid that has not been filled with medium (coarse) sand, so as to ensure that the geogrid is flat and does not bulge or wrinkle. After the second layer of medium (coarse) sand is flat, it must be leveled. Measure to prevent uneven filling thickness. After the leveling is correct, use a 25T vibratory roller to statically press it twice.

(5) The construction method of the second layer of geogrid is the same as that of the first layer. Finally, 0.3m of medium (coarse) sand is filled. The filling method is the same as that of the first layer. After static pressure twice with a 25T road roller, reinforcement of the subgrade base is completed.

(6) After the third layer of medium (coarse) sand is rolled, two geogrids are laid on both sides of the slope along the longitudinal direction of the line, with an overlap of 0.16m, and connected by the same method, and then the earthwork construction operation starts. When laying geogrid for slope protection, it is necessary to measure the paved sideline for each layer and ensure that the geogrid is buried 0.10m inside the slope after slope repair.

(7) Every time two layers of soil are filled with slope geogrid, that is, when the thickness is 0.8m, a layer of geogrid should be laid on both sides at the same time, and so on, until it is laid under the surface soil of the road shoulder.
(8) After the subgrade is filled, the side slope shall be repaired in time, and dry rubble protection shall be carried out at the foot of the slope. In addition to widening the subgrade by 0.3m on each side, 1.5% of the settlement shall be reserved.