geocell features:
1. It can be stretched freely, can be retracted for transportation, and can be stretched into a mesh during construction, filled with loose materials such as soil, gravel, concrete, etc., to form a structure with strong lateral restraint and high rigidity.
2. The material is light, wear-resistant, chemically stable, resistant to light and oxygen aging, acid and alkali, and is suitable for soil conditions such as different soils and deserts.
3. High lateral limit and anti-slip, anti-deformation, effectively enhance the bearing capacity of the roadbed and disperse the load.
4. Changing the geocell height, welding distance and other geometric dimensions can meet different engineering needs.
5. Flexible expansion and contraction, small transportation volume; convenient connection and fast construction speed.
Cell engineering application:
1. Handling half-filled and half-subgrade
When building an embankment on a slope with a natural slope of 1:5, the base of the embankment should be dug with steps, and the width of the steps should not be less than 1M. When the road is constructed in stages or widened, the junction of the old and new subgrade fill slopes should be opened. For excavation of steps, the width of the steps of high-grade highways is generally 2M, and geocells are laid on the horizontal surface of each layer of steps to better solve the problem of uneven subsidence by using the lateral reinforcement effect of the geocell itself.
2. Subgrade in sandy area
The subgrade in the sandy area should be mainly low embankment, and the filling height is generally not less than 0.3M. Due to the professional requirements of low subgrade and heavy load bearing for the subgrade construction in the sandy area, the use of geocells can limit the loose filler. The guaranteed subgrade has high stiffness and strength within a limited height to withstand the load stress of large vehicles.
3. Reinforcement of backfill roadbed
The use of geocells can better achieve the purpose of reinforcement on the back of the platform. Sufficient friction can be generated between the geocells and the filler, which can effectively reduce the uneven settlement between the subgrade and the structure, and finally can effectively alleviate the "abutment jumping". Early impact damage to the bridge deck due to "car" disease.
4. Subgrade in permafrost areas
When building fill subgrades in permafrost areas, the minimum fill height should be reached to prevent the occurrence of slurry churn or the lowering of the upper limit of the frozen layer, resulting in excessive settlement of the embankment. The unique façade reinforcement effect of the geocell and the overall confinement of effective implementation can ensure the minimum filling height in some special sections to the greatest extent, and make the filling have high-quality strength and rigidity.
5. Loess Collapsible Subgrade Treatment
When expressways and first-class highways pass through collapsible loess and loess sections with good compressibility, or when the allowable bearing capacity of the foundation of high embankment is lower than the pressure of the combined vehicle load and the self-weight of the embankment, the embankment shall also be adjusted according to the bearing capacity requirements. At this time, the superiority of the geocell is undoubtedly manifested.
6. Saline soil, expansive soil
The highways, first-class highways, road shoulders and slopes built with saline soil and expansive soil adopt reinforcement measures. The facade reinforcement effect of the cell is the most excellent of all reinforcement materials, and it has excellent corrosion resistance. It can fully meet the requirements of building high-grade highways in saline soil and expansive soil.
geocell construction method:
1. Working face: Some slopes have already met the requirements. The slope repair construction is in progress, and the working face will be provided one after another. The smoothness of the slope is related to the success or failure of grass planting protection in the geocell. Laying geocells on uneven slopes is prone to stress concentration, which will crack the cell welds and cause cell straddling, etc. Therefore, it is necessary to level the slope surface to the design requirements, and manually repair the slope to remove pumice and dangerous stones on the slope surface.
2. The main drainage ditch system should be set on the side slope of the paved cell, with a distance of 4m between the two adjacent ditches. The drainage ditch is connected with the side ditch of the highway, so that the water in the road area flows into the drainage channel along the side ditch and enters the edge of the highway. , so as to avoid water on the road and prevent the slope protection from scouring the cell.
3. The top of the slope is leveled to remove some sundries that are not conducive to the laying of the cells, so that the slope is kept flat and strong, and a layer of high-quality soil can also be sprinkled first to facilitate the growth of plants.
4. The cell should be laid from top to bottom in the main force direction, so that the cell sheet is heavy and perpendicular to the road subgrade. Never lay horizontally.
5. Fully open the cell components, and nail a hook-shaped riveting pile at the top of each cell. The length of the riveting pile is required to be 2 times the height of the cell itself plus 30cm. For a 5cm cell, its riveting pile should be 2× 5cm+30cm, 40cm length, 10cm cell, its riveting pile should be 2 × 10+30, 50cm long, both sides are driven into the riveting pile along the drainage ditch, and bamboo and wood piles can be used, mainly to open the grid Bamboo and wood piles can also be used in the middle and bottom of the chamber, and the top riveting pile mainly plays the role of hanging and riveting the grid. Better materials, such as steel rods, should be used. The steel rods must be perpendicular to the slope, and the others mainly play the role of tensioning chambers during construction, and the available materials are relatively simple.
6. After the cell is stretched and riveted, fill the cell space from top to bottom with high-quality soil suitable for planting turf or grass seeds. The filling should be 1.2 times the height of the cell, and it should be tapped firmly and planted in time. on vegetation.
7. When used on the lower slope of the highway, the drainage ditch should be connected with the road shoulder retaining ditch to facilitate the drainage of the road surface water without scouring the slope protection. Make the stagnant water blocking ditch at the height of the upper slope flow into the drainage ditch to prevent the stagnant water from directly scouring the slope protection. The upper slope should try to use a geocell with a higher height.
8. After the construction is completed, the re-inspection work should be done well, and the riveted piles that are not sufficiently stretched should be reworked in time until the turf or grass seeds are completely alive.
