What are the key points of geogrid construction?

1. Construction site: It is required to be compact and flat, horizontal, and clear spikes and protrusions.

2. Grid laying: On the flat and compacted site, the main force direction (longitudinal) of the installed grid should be perpendicular to the axis of the embankment, and the laying should be smooth, without wrinkling, and tensioned as far as possible. The main force direction of the laid grille is preferably long without joint, and the connection between the width and width can be manually tied and lapped, and the width of the lapped is not less than 10cm. If the grating is set in more than two layers, the layers should be staggered between the layers. After laying a large area, its flatness should be adjusted as a whole. When a layer of soil is filled, before rolling, the grille should be tensioned with manual or machine again, and the strength should be uniform, so that the grille is in a straight stress state in the soil.

3, the selection of filler: filler should be selected according to the design requirements. It has been proved by practice that all kinds of fillers can be used except frozen soil, swamp soil, domestic refuse, chalk soil and diatomite. However, gravel soil and sand soil have stable mechanical properties and little influence on water content, so they should be preferred. The particle size of the packing shall not be greater than 15cm, and pay attention to control the grading of the packing to ensure the compaction weight.

4, the paving and compaction of the filler: when the grid is laid and positioned, it should be filled with soil in time, the exposure time shall not exceed 48 hours, and the flow operation method of laying and backfilling can also be adopted. Spread the filler at both ends, secure the grille, and then push it towards the middle. The order of rolling is first side and then middle. When rolling, the roller can not directly contact with the reinforcement, and the uncompacted reinforcement body generally does not allow the vehicle to drive on it, so as to avoid the dislocation of the reinforcement. The lamination compaction degree is 20-30cm. The degree of compaction must meet the design requirements, which is also the key to the success of reinforced soil engineering.

5, anti-drainage measures: in the reinforced soil engineering, it is necessary to make drainage treatment inside and outside the wall; To do a good job of foot protection, prevent erosion; In the soil body to set up filtration, drainage measures, if necessary, should be set up geotextile, permeable pipe (or blind ditch). Drainage in the way of dredging, can not be blocked, otherwise there will be hidden dangers.