The fourth is the supporting struct

The fourth is the supporting structure (1) The earth-rock support structure of this project adopts soil nail support. (2) The soil nail support adopts the soil on the sidewall of the foundation pit and the soil nail support structure. It inserts the entire soil body to bond with the soil body, and sprays concrete on the broken surface to form a reinforced soil reinforcement area to improve the in-situ strength of the entire soil body and present its displacement value, while increasing Self-stability of the slope of strong foundation pit (3) Process flow: Excavation of working face → hole formation → steel bar → grouting → sprayed concrete surface → soil nail pull-out force test 1 Soil nail wall construction is layered construction along with the excavation of the working face. 2 Pore-forming technology and methods and soil conditions. The means and experience of mechanical equipment and construction units. three. Before placing the reinforcement, it is best to use compressed air to remove the residual and disturbed spoil in the hole. 4 The soil nail grouting is poured by a grouting pump, and the grouting uses 1:2 cement mortar. 5 In order to prevent soil relaxation and disintegration, the first layer of sprayed concrete must be carried out as soon as possible. For temporary support, the surface layer shall be made one layer with a thickness of 50-150 mm; the permanent support surface layer shall be two to three layers with a thickness of 100-300 mm. The strength grade of the shotcrete shall not be lower than C15. In shotcrete, steel mesh is provided. The mesh distance is 200-300mm, the steel bar diameter is 6-10mm, and there are 1-2 layers in the sprayed concrete surface. 6. The nail extraction force inspection shall be inspected by professional units and personnel.