Soil nailing is a construction technique generally used for the stabilization of naturally unstable slopes or securing of over-steepened existing slopes, as well as the stabilization of retaining walls or embankments. For underground applications, soil nails are also referred to as rock nails or bolts.
Fields of Application
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Rock Fall Protection
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Portal Stabilization |
Slope Stabilization |
The basic concept of soil or rock nail is based on the installation of longitudinal reinforcement elements into the ground. Hence, this load-bearing system significantly differs from ground anchors (actively tensioned) and tensile piles, as the nail is installed un-tensioned (passive system). Consequently, self-drilling anchor system increase the load-bearing capacity of the entire structure and act as a group of elements, withstanding tensile and shear forces acting on the self drilling anchor system. The center-to-center distance of nails must be chosen so that they are able to act as a complete nailing system. Prior to nail installation, the excavation face is generally supported by shotcrete, precast concrete elements, mesh, or geotextiles. The design of a nail head construction depends on the application and the intended lifetime of the structure.
Conventional nail systems consisting of solid threaded bars are installed into pre-drilled holes and subsequently grouted. Self drilling anchor system used as soil nails are installed self-drilling, and are either grouted simultaneously during drilling or afterwards.
1, Ancho bit
2, Anchor bar
3, Anchor coupler
4, Anchor plate
5, Anchor nut