Attention should be paid to the use

Attention should be paid to the use of excavators to directly remove soft strata:1) For the excavation section of soft rock strata, the contractor shall determine the excavation size and slope slope slope by calculation according to the soil condition, construction load and construction water level, etc., and then give an argument and approval. Soil with a thickness of no less than 0.5m shall be retained as a protective layer during excavation.2) Excess depth or width excavation exceeding allowable deviation must follow the specified packing.3) The excavation slope should be protected during the excavation.When the earth is excavated, it should be combined with digging and filling as much as possible and transported directly to the filling site for unloading at one time. Or temporarily pile up in the designated place, the redundant abandoned earth should be transported to the designated abandoned land points according to the requirements of the pile up. Stacking is strictly prohibited near the top of the foundation pit.4) The protective soil layer shall be excavated by manpower to avoid disturbing the foundation.5) The excavation of the protective layer soil should be carried out after the preparation of the next proce