Rembco Geotechnical Contractors - Nailing Support, Retaining Wall, Soil Shoring
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Soil Nailing

Soil nailing is a stabilization method of reinforcing existing soil by installing threaded steel bars into slopes or cuts as construction proceeds from top down. Grouted bars are installed to create a stable mass of soil, first step in building a solid wall. The nailing process creates a single block of earth able to hold-back its overburden. Soil nailing is an economical means of creating shoring systems and retaining walls. Often, nailing is less disruptive than other means of constructing retaining systems.

Soil nailing not only works in tension, but also bending and shearing forces. Generally, this process increases bonding strength of media through its ability to carry tensile loads. A constructed face is usually required over shoring bars, typically made of a shotcrete cover, which is reinforced using woven mesh over steel plates. Permanent walls are usually built with a cast-in-place face over the wall surface.


Soil Nailing Advantages:

  • Used to follow irregular curves.
  • Equipment is portable for tight spaces.
  • The technique is flexible, easily modified.
  • Creates less noise and traffic obstructions.
  • Less impact on nearby properties.
  • Requires minimum shoring space.

Rembco Geotechnical Contractors - Pressure Grouting Shotcrete


Installation Sequence
 
The shoring requires drilling through the active zone into ground's passive zone.

1. A five foot cut is made to begin initial level of the nailing operation.

2. Holes are drilled into cut bank on about five foot centers.

3. Threaded bars are placed in shoring holes.

4. Threaded bars are grouted in place from bottom up.

5. Wire screen attached to rebar reinforcement installed over cut face.

6. First coating of shotcrete applied to cover protruding threaded bar.

7. Plates, washers, nuts positioned on shoring bars then locked down.

8. Second coat of shotcrete applied over soil and plates.

9. Repeat steps 1 through 8 for every lift of retaining wall construction.

Active Zone / Passive Zone Soil - Wall Construction


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