What are the main points of drainage construction in the middle zone?
1. The convex central partition is used to make most of the rainwater drain out of the road by itself, but some water will seep into the central partition. In order to prevent this part of water from penetrating into the pavement base, subbase and soil foundation, the two ends of the pavement in the central divider and the bottom of the central divider are wiped with 2 cm of cement mortar, and then asphalt is applied, followed by anti-seepage geotextiles and the central divider. The bottom adopts a vertical gravel blind ditch and a drainage system with a lateral drainage pipe. A soft water permeable pipe is buried in the vertical gravel blind ditch, a water collecting trough is set every 50 to 70m, and then discharged out of the roadbed through the lateral drainage pipe. In order to prevent the fence post from damaging the centering zone waterproof system, the fence should be hit first. Fill the soil again, and then fill the soil with waterproof treatment on the bottom of the pillar after the pillar has been driven;
2. Apply double-layer asphalt on the subgrade and pavement structure layer within the central partition. In order to prevent rainwater that has penetrated into the backfill soil of the central separation zone from further penetrating into the pavement structure layer and subgrade, a vertical gravel blind ditch is set at the bottom of the central separation zone (single-size crushed stone is not greater than 4cm, and the mud content is not greater than 3% ), And laterally rigid plastic pipes with a diameter of 5cm are staggered at about 100m on both sides of the road to make rainwater out of the subgrade area. The entrance of the hard plastic pipe is wrapped with geotextile, and the gravel blind trench is covered with geotextile to isolate it from the backfill soil.
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