Which site in Nanning needs reclamation?

Earthwork backfill is an important subproject in foundation and foundation subproject. However, in construction projects, quality management is often neglected due to factors such as rushing to the construction period, and quality defects such as loose backfill are prone to occur. This paper is an example of backfill construction in a company's high-quality project, which comprehensively interprets the technical points and is worth learning.

1, this project adopts plain soil backfill (locally lime soil), and the backfill material must be submitted for inspection to test its water content and maximum dry density. After inspection, it can be put into use only if it meets the following requirements.

2. Gravel soil, sandy soil (with the consent of the design unit when using fine sand and silt) and blasting slag can be used as fillers below the surface. Its maximum particle size shall not exceed 2/3 or 3/4 of the paving thickness of each layer (when vibration rolling is used), and the water content shall comply with the regulations.

3, cohesive soil should check its moisture content, must meet the requirements of design and construction specifications before use.

4, saline soil generally can't be used. However, the filler must not contain salt crystals, salt lumps or roots of salt-bearing plants, and it can be used only if it meets the requirements of Appendix I Table 1 ~ 8 of Code for Construction and Acceptance of Earthwork and Blasting Engineering.

5. Soil: It should be sieved before use, the particle size should not be greater than 50 mm, and it should not contain organic impurities or frozen soil. The optimum water content (weight ratio) should meet the requirements: sandy soil: 8-12%; Clay:19-23%; Silty clay:12-15%; Silt: 16-22%.

Quicklime must be digested, the particle size should not exceed 5 mm, and it should not contain too much water.

Plain soil should be screened and the particle size should not exceed 50 mm.

Lime soil should be mixed evenly according to the design requirements.