2017年04月10日

Soil nail supporting structure

Soil nailing structure is a new retaining structure for soil excavation and slope stabilization since the 1970s. It combines soil mass, soil nail body and concrete front-panel. Through installing soil nail with certain length and density in soil mass, soil nail forms compound soil body based on cohesive force and frictional resistance. Under the circumstance of soil deformation, soil nail accepts passive stress and then reinforce the soil mass by the tension effect. This will not only enhance the stiffness of entire soil body, but also remedy the weakness of soil body: shear-resistance and low-extension strength. Then, the supporting structure with active restriction mechanism is formed, which will enhance the entire stability and improve soil body’s plastic deformation and failure property.
Soil nail has the functions of convenient, reliable and economical. At the same time, during soil nail construction, the influence for surrounding environment is little. So, soil nail supporting is widely used in foundation excavation project.
Facing with so many difficulties and challenges among excavation and support slope, supporting operation of soil nail has played an important role on the safety of construction.
There are several problems need to be considered during the construction:
1. Before installing soil nail, there are loose rocks falling down when cleaning. So workers shouldn’t operate under this area.
2.When working on muck bank or frame, safety should be noticed.
3.Workers should operate with each other. Temporary supporting shouldn’t be canceled before linking steel frame and soil nail.
4.When deformation or crack appearing during the process of drilling and grouting, efficient remedial measures should be adopted according to conditions and workers should leave danger areas immediately.
5.When mortar grouting into soil nail, pressure gauge should be checked closely. If the indication is too high, special measures should be adopted and ignoring blocking. In addition, nozzle of grouting pipe should not point to people.
6.Workers should operate according to the operation procedure strictly, ignoring the occurrence of security accident.
Posted by soilnailsystems at 17:13│Comments(0)TrackBack(0)

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