First, the basic requirements?

1. Within the scope of subgrade land and borrow pit, surface vegetation, sundries, accumulated water, silt and topsoil shall be removed according to the specifications and design requirements, pits and ponds shall be treated, and the basement shall be compacted. ?

2. The subgrade filler should comply with the design specifications and regulations, and be reasonably selected after careful investigation and test. ?

3. Fill subgrade shall be compacted in layers, with smooth surface on each layer, proper road arch and good drainage. ?

4. The construction temporary drainage system should be combined with the design drainage system to avoid scouring the water near the slope and subgrade. ?

5. Take soil reasonably in the set soil area, and do not open or dig indiscriminately. After completion, the borrow pit and spoil ground shall be trimmed as required to ensure reasonable geometry.

Second, the measured project

1. The compactness listed in the table shall be subject to the heavy compaction test method.

2. When using nuclear instrument to check the degree of compaction, calibration test should be conducted to confirm its reliability.

3. Subgrade with special drought, special humidity or excessively wet soil can be evaluated according to the compaction standard stipulated in the subgrade design and construction specifications issued by the Ministry of Communications.

4. When paving asphalt concrete or cement concrete pavement on Grade III and IV highways, the compaction degree of subgrade should adopt Grade II highway standards.

5."?" Indicate the key inspection items in the list of measured items.

Third, the appearance appraisal

1. The subgrade surface is smooth, the sideline is straight and the curve is smooth.

2. The subgrade slope is smooth and stable, and the slope shall not be damaged, and the curve is smooth.

3. The locations of borrow pits, spoil piles, berms and crushing platforms are reasonable, and the appearance is neat and beautiful to prevent soil erosion.

4. There should be no turquoise when going uphill.