The laying direction of grid is always perpendicular to the center line of subgrade

1. Foundation treatment:

First of all, the lower layer shall be leveled and rolled, and the flatness shall not be greater than 5m, and the compactness shall meet the design requirements. The surface shall be free of hard protrusions such as gravel and block stone. 2. Laying environment: outdoor temperature is above 5 ℃, wind force is below 4, and there is no rain or snow. (except for environmental or special requirements)

2. Laying and lapping method:

2.1 the geogrid shall be laid on the leveled lower bearing layer according to the design width, and it shall be pulled during paving
Straight, smooth, close to the underlying layer, no twist, fold, overlap, lap joint is fixed with U-shaped nail or connector
2.2 when geogrid is laid, the direction with high main strength of reinforcement shall be perpendicular to the axis of embankment
The overlapping length (longitudinal) of each panel shall not be less than 15cm, and shall be fixed with U-shaped nails or connectors,
The distance is 1.0m, the transverse lap length is 30 ~ 90cm, and the lap position is fixed with U-shaped nail or nylon rope.

3. Quality inspection after laying and building

3.1 after the geogrid is laid, self inspection shall be carried out first, and the quality requirements are shown in the table below
No. inspection method and frequency of project construction quality requirements
The flatness of 1 ~ lower bearing layer is 15mm, and 4 places are inspected every 200m
2. Longitudinal lap width 15cm, check 2%
3. Transverse lap width ≥ 30m, spot check 2%
4. The stagger distance of lap joint ≥ 50cm, 2% spot check

4. Backfilling:

4.1 after the geogrid materials are paved in place, the filling materials shall be filled in time to avoid sunlight
The watermark version only pre monitors the downloaded documents, and has no watermark
In general, the interval should not exceed 48h.
4.2 filling requirements: the maximum filling material is within 8 cm from the geogrid layer
The material diameter shall not be greater than 6cm, and the first layer of geogrid shall be paved with light bulldozer or
The loader is driven along the axis of the embankment for compaction, and the compaction thickness is greater than 60cm.