2016年08月24日

Some datas of soil nail


Soil and rock nailing is a relatively new construction technique first utilized in Europe to stabilize and construct tunnels. In North America, it is quickly becoming a popular method of soil and rock retention, slope stabilization, and shoring. Soil nailing provides project owners and DOTs economic benefits and a rapid means of retaining wall and retention support system construction. Two very different projects proved the advantages of soil nailing over conventional retaining wall construction for DOTs in Kentucky and Iowa.
The size, length and spacing of soil nails are determined by structural engineers based on a soil evaluation at the building site. When all nails have been driven in the wall of the first excavation, workers apply a shotcrete facing that’s usually between 3 in. and 6 in. thick. Drainage matting material and steel mesh are sometimes incorporated into this spay-applied wall. Promoting good drainage helps to prevent hydrostatic pressure from building up behind the wall. The steel mesh is included to increase the strength of the concrete.

When the first "dig" complete, another excavation is made and the same nail and shotcrete installation is repeated. This sequence gets the retaining wall built in safe, manageable increments, without the risk or expense of making a single full-depth excavation and erecting a concrete block or poured-concrete wall. In the case mentioned above, the soil nail and shotcrete retaining wall simply stabilized the foundation hole while permanent reinforced concrete basement walls were formed and poured. But these walls can also serve as primary, stand-alone retaining walls in other applications.


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