Cement-solidified graded macadam is selected for water-stable layer, and the purpose of engineering maintenance is achieved by compaction. The principle of action is to choose graded macadam as aggregate, and when filling the gap of aggregate, you can choose the corresponding amount of cementing material and mortar, and pave and compact according to the principle of embedding and squeezing. Its compactness and compactness are similar, and the principle of interlocking between gravels is the basis of strength growth.

The initial strength of the water-stable layer is high, and the strength increases with the extension of age, and soon a plate body is formed. Because of its relatively high strength, the surface of the water-stable layer is solid after it is formed, which is the best material for pavement base construction.

Key points of construction

1, control the slope of running water to avoid reverse slope.

2. The pipeline installation sequence is from downstream to upstream, inserted downstream and inserted upstream.

3. Strictly control the temperature, time and current of pipeline hot melting to ensure the dry interface. Strictly control the tightness of the pipeline interface, the interface between the pipeline and the inspection well, and the self-contained interface of the inspection well to ensure the closed water quality.

4, carat pipe to prevent thermal expansion and contraction, material storage pay attention to the sun, after the completion of the Ann tube waist backfill in time, to prevent drift tube;

5. Before trench excavation, check the prefabrication of well cover plate, and the maintenance period shall not be less than 28 days. According to the depth of groundwater level and the depth of pipe trench, the corresponding dewatering and drainage measures are formulated.

6. By the way, dig out the trench of the rain-polluted branch well. Dig to the design elevation (reserve 20cm for manual leveling), and then carry out manual slope repair and bottom cleaning. When digging, it is forbidden to pile up a large amount of earthwork within the range of 1.5m at the slot edge.

7. After the first foundation trench excavation is completed, notify the supervisor, owner, designer and geological prospecting to inspect the foundation trench.

8. After the trench excavation of the pipeline is accepted by the supervision engineer, the next procedure can be carried out.