Soil Nailing & Shot Crete



Soil nailing is an economical technique for stabilizing slopes and for constructing retaining walls from top to down and also used for supporting excavation side. Its construction process is faster than other similar methods. This soil reinforcement process uses steel tendons, which are drilled and grouted into the soil to create a composite mass similar to a gravity wall. Shotcrete facing is typically applied, although there are many other architectural options such as precast panels. Softec has a versatile fleet of equipment that is specially designed for soil nailing. We have found soil nail walls to be a very attractive alternative to cut retaining walls. We use nails for excavation side support, it starts by the site excavation stage with depth about 1.5-2.0m it must be below the first row of soil nail with a minimum of 75 cm and inclination as per design. After that the execution of the facing stage, shotCrete layer reinforced by single or double welded steel mesh located at mid thickness of the shotCrete layer. The welded steel mesh shall be erected at the excavated slope with spacers to keep the design thickness between steel mesh and excavated slope. Pipes with diameter 200mm shall be installed to the steel mesh at the commenced anticipated location of the soil nails. After placing the shotCrete layer, the nail hole shall be drilled with diameter and inclination according to design around 10°-30°.


Just after completing the nail hole drilling operation, the steel nail is installed to the drilled hole. Plastic or steel centralizers shall be erected at the full length of steel nail at spacing not more than 1.5m to position the nail inside the hole. The grout shall take place just before installation of the nail under gravity. Grouting shall be from the bottom of the hole upward and shall be for full length of the hole. After installation of nail, a steel bearing plate with dimension and diameter according to design shall be erected and securing nuts are placed at each nail head and the nut is tightened sufficiently so as complete contact is developed between the plate and the shotCrete.

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