An Introduction To Soil Nailing
Soil Nailing is a construction method used to maintain or enhance the stability of the soil or rock mass.
Soil/Rock Nailing is a construction method used to maintain or enhance the stability of the soil or rock mass by installing reinforcing elements (nails) in accordance to the principles for the execution of the geotechnical works. Nailing (sometimes combined with other elements like shotcrete, drainage system, Retaining walls, etc.) forms a retaining structure of reinforced Soil/Rock mass which nails are predominantly subjected to tensile stress. In addition, they might be also subjected to bending the shear stresses.
The nail systems can be used as:
- Temporary nail – Nail with a working life of up to 2 years
- Permanent nail – Nail with a working life up to 50 years depending on the ground conditions and with sacrificial corrosion for the time dependent corrosion behaviour.
The area of applications for the above nail types in accordance with prEN 14490 are:
- Slope stabilization for vertical and inclined use
- Underground primary support for tunnel construction, radial ground reinforcement and face stabilization
The principles for the application and execution of the micro pile foundations are specified in micro pile standard EN 14199 defining the execution of micro piling works and are divided into following intended working life:
- Temporary micro piles – Micro piles with a service life of up to 2 years.
- Permanent micro piles – Micro piles with a service life of up to 50 years dependent on the ground conditions and including sacrificial corrosion for the time-dependent corrosion behaviour.
Self-drilling anchor system
Self-drilling anchor system consists of a fully threaded hollow-core steel bar which can be drilled and grouted into loose or collapsing ground without casing and acts as reinforcing element according to Ground Engineering principles e.g. Soil nail, Rock bolt or anchor.
The bar features a hollow core for passing of flushing medium (air or water) and can be drilled and then post grouted as well as installed using simultaneous drilling and grouting.
The bar is manufactured with a continuous left hand thread (“R” for Rope and „T“ for Trapezoidal thread) and can be extended by the use of extension couplings, while connecting via standard drilling adapters to the rotary percussion drill head (also called Rock drill or Drifter) used on the feed of the drilling equipment. This rotary percussion drill head then provides and passes the rotation and impact energy through the threaded hollow steel bar down to the drill bit, which cuts the soil or rock formation to form the borehole.
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